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From: Joseph Salowey <joe@salowey.net>
Date: Mon, 2 Aug 2021 13:33:48 -0700
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To: Mark Nottingham <mnot@mnot.net>
Cc: secdir <secdir@ietf.org>, draft-ietf-httpbis-bcp56bis.all@ietf.org,  HTTP Working Group <ietf-http-wg@w3.org>, last-call@ietf.org
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdir/vn0EQh78cEP70y4m7FetP63M34w>
Subject: Re: [secdir] [Last-Call] Secdir last call review of draft-ietf-httpbis-bcp56bis-12
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On Sun, Jul 25, 2021 at 7:43 PM Mark Nottingham <mnot@mnot.net> wrote:

> Thanks for the review. I've opened an issue to track it:
>   https://github.com/httpwg/http-extensions/issues/1582
>
> Responses below.
>
>
> > On 26 Jul 2021, at 3:30 am, Joseph Salowey via Datatracker <
> noreply@ietf.org> wrote:
>
> > Major Issues:
> >
> > + I had trouble with section 4.12 Client Authentication which states:
> >
> > "Applications can use HTTP authentication Section 11 of
> > [I-D.ietf-httpbis-semantics] to identify clients. The Basic
> authentication
> > scheme [RFC7617] MUST NOT be used unless the underlying transport is
> > authenticated, integrity-protected and confidential (e.g., as provided
> the
> > "HTTPS" URI scheme, or another using TLS). The Digest scheme [RFC7616]
> MUST NOT
> > be used unless the underlying transport is similarly secure, or the
> chosen hash
> > algorithm is not "MD5"."
> >
> > I'm not sure what the "or chosen hash algorithm is not "MD5" is meant to
> say.
> > What I think the document should say is:
> >
> > The Digest scheme [RFC7616] MUST NOT be used unless the underlying
> transport is
> > similarly secure. The "MD5" digest algorithm MUST NOT be used.
>
> Hmm. I forgot that RFC7616 has a pre-existing requirement in Section 5.1:
>
> > If Digest Authentication is being used, it SHOULD be over a secure
> channel like HTTPS [RFC2818].
>
> Are we saying that that SHOULD is really a MUST for all uses of HTTP, or
> just those in scope for this document? Likewise for the effective
> deprecation of md5.
>
> If so, perhaps the easiest thing to do would be to state that clearly;
> e.g.,
>
> """
> [RFC7616] Section 5.1 recommends that the Digest scheme be used over a
> secure channel like HTTPS. This document strengthens that recommendation to
> MUST, and deprecates the md5 hash algorithm in the Digest scheme.
> """
>
> ... and listing 7616 as being updated by this document.
>
> Thoughts?
>

[Joe]  I think we should deprecate MD5 in all cases and I also think you
should treat digest as basic auth and run it over a secure channel in all
cases.  The text update looks good.


>
> > + There is a security consideration that I think the document should
> cover.
> > Many HTTP based protocols make heavy use of bearer tokens, such as
> session
> > cookies, for authentication and authorization purposes.  This means that
> an
> > attacker that can eavesdrop on HTTP communications can often escalate
> their
> > privilege to perform operations on resources.   I think you could add
> this to
> > the security considerations:
> >
> > " Section 4.4.2 requires support for 'https' URLs, and discourages the
> use of
> > 'http' URLs, to provide authentication, integrity and confidentiality,
> as well
> > as mitigate pervasive monitoring attacks.  Many HTTP based protocols
> make heavy
> > use of bearer tokens, such as session cookies, for authentication and
> > authorization purposes.  This means that an attacker that can eavesdrop
> on HTTP
> > communications can often escalate their privilege to perform operations
> on
> > resources. "
>
> See
> https://github.com/httpwg/http-extensions/commit/fe3f298e4d60514306e391398cc870abaedd8bf9
>
> [Joe] Looks good.


> > Minor Issues:
> >
> > + Section 4.5.1 - This could be a good place to mention RFC-8470 on TLS
> 1.3
> > early data which can also be a source of GET request replay
>
> See
> https://github.com/httpwg/http-extensions/commit/b03c376179e278deb3d994eac152c6a131702840
>
>
[Joe] I left a comment with a text suggestion.


> Cheers,
>
> --
> Mark Nottingham   https://www.mnot.net/
>
>

--0000000000002d5d1b05c8997dbe
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Sun, Jul 25, 2021 at 7:43 PM Mark =
Nottingham &lt;<a href=3D"mailto:mnot@mnot.net">mnot@mnot.net</a>&gt; wrote=
:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.=
8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Thanks for the=
 review. I&#39;ve opened an issue to track it:<br>
=C2=A0 <a href=3D"https://github.com/httpwg/http-extensions/issues/1582" re=
l=3D"noreferrer" target=3D"_blank">https://github.com/httpwg/http-extension=
s/issues/1582</a><br>
<br>
Responses below.<br>
<br>
<br>
&gt; On 26 Jul 2021, at 3:30 am, Joseph Salowey via Datatracker &lt;<a href=
=3D"mailto:noreply@ietf.org" target=3D"_blank">noreply@ietf.org</a>&gt; wro=
te:<br>
<br>
&gt; Major Issues:<br>
&gt; <br>
&gt; + I had trouble with section 4.12 Client Authentication which states:<=
br>
&gt; <br>
&gt; &quot;Applications can use HTTP authentication Section 11 of<br>
&gt; [I-D.ietf-httpbis-semantics] to identify clients. The Basic authentica=
tion<br>
&gt; scheme [RFC7617] MUST NOT be used unless the underlying transport is<b=
r>
&gt; authenticated, integrity-protected and confidential (e.g., as provided=
 the<br>
&gt; &quot;HTTPS&quot; URI scheme, or another using TLS). The Digest scheme=
 [RFC7616] MUST NOT<br>
&gt; be used unless the underlying transport is similarly secure, or the ch=
osen hash<br>
&gt; algorithm is not &quot;MD5&quot;.&quot;<br>
&gt; <br>
&gt; I&#39;m not sure what the &quot;or chosen hash algorithm is not &quot;=
MD5&quot; is meant to say. <br>
&gt; What I think the document should say is:<br>
&gt; <br>
&gt; The Digest scheme [RFC7616] MUST NOT be used unless the underlying tra=
nsport is<br>
&gt; similarly secure. The &quot;MD5&quot; digest algorithm MUST NOT be use=
d.<br>
<br>
Hmm. I forgot that RFC7616 has a pre-existing requirement in Section 5.1:<b=
r>
<br>
&gt; If Digest Authentication is being used, it SHOULD be over a secure cha=
nnel like HTTPS [RFC2818].<br>
<br>
Are we saying that that SHOULD is really a MUST for all uses of HTTP, or ju=
st those in scope for this document? Likewise for the effective deprecation=
 of md5.<br>
<br>
If so, perhaps the easiest thing to do would be to state that clearly; e.g.=
,<br>
<br>
&quot;&quot;&quot;<br>
[RFC7616] Section 5.1 recommends that the Digest scheme be used over a secu=
re channel like HTTPS. This document strengthens that recommendation to MUS=
T, and deprecates the md5 hash algorithm in the Digest scheme.<br>
&quot;&quot;&quot;<br>
<br>
... and listing 7616 as being updated by this document.<br>
<br>
Thoughts?<br></blockquote><div><br></div><div>[Joe]=C2=A0 I think we should=
 deprecate MD5 in all cases and I also think you should treat digest as bas=
ic auth and run it over a secure channel in all cases.=C2=A0 The text updat=
e looks good.=C2=A0=C2=A0</div><div>=C2=A0</div><blockquote class=3D"gmail_=
quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,=
204);padding-left:1ex">
<br>
&gt; + There is a security consideration that I think the document should c=
over. <br>
&gt; Many HTTP based protocols make heavy use of bearer tokens, such as ses=
sion<br>
&gt; cookies, for authentication and authorization purposes.=C2=A0 This mea=
ns that an<br>
&gt; attacker that can eavesdrop on HTTP communications can often escalate =
their<br>
&gt; privilege to perform operations on resources.=C2=A0 =C2=A0I think you =
could add this to<br>
&gt; the security considerations:<br>
&gt; <br>
&gt; &quot; Section 4.4.2 requires support for &#39;https&#39; URLs, and di=
scourages the use of<br>
&gt; &#39;http&#39; URLs, to provide authentication, integrity and confiden=
tiality, as well<br>
&gt; as mitigate pervasive monitoring attacks.=C2=A0 Many HTTP based protoc=
ols make heavy<br>
&gt; use of bearer tokens, such as session cookies, for authentication and<=
br>
&gt; authorization purposes.=C2=A0 This means that an attacker that can eav=
esdrop on HTTP<br>
&gt; communications can often escalate their privilege to perform operation=
s on<br>
&gt; resources. &quot;<br>
<br>
See <a href=3D"https://github.com/httpwg/http-extensions/commit/fe3f298e4d6=
0514306e391398cc870abaedd8bf9" rel=3D"noreferrer" target=3D"_blank">https:/=
/github.com/httpwg/http-extensions/commit/fe3f298e4d60514306e391398cc870aba=
edd8bf9</a><br>
<br></blockquote><div>[Joe] Looks good.=C2=A0</div><div>=C2=A0</div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1p=
x solid rgb(204,204,204);padding-left:1ex">
&gt; Minor Issues:<br>
&gt; <br>
&gt; + Section 4.5.1 - This could be a good place to mention RFC-8470 on TL=
S 1.3<br>
&gt; early data which can also be a source of GET request replay<br>
<br>
See <a href=3D"https://github.com/httpwg/http-extensions/commit/b03c376179e=
278deb3d994eac152c6a131702840" rel=3D"noreferrer" target=3D"_blank">https:/=
/github.com/httpwg/http-extensions/commit/b03c376179e278deb3d994eac152c6a13=
1702840</a><br>
<br></blockquote><div><br></div><div>[Joe] I left a comment with a text sug=
gestion.=C2=A0</div><div>=C2=A0</div><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddin=
g-left:1ex">
Cheers,<br>
<br>
--<br>
Mark Nottingham=C2=A0 =C2=A0<a href=3D"https://www.mnot.net/" rel=3D"norefe=
rrer" target=3D"_blank">https://www.mnot.net/</a><br>
<br>
</blockquote></div></div>

--0000000000002d5d1b05c8997dbe--


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From: Mark Nottingham <mnot@mnot.net>
In-Reply-To: <CAOgPGoB7a1-YCdvEqr_ZAdJ38GiA5HPU+T-S10jqu=C4argp5A@mail.gmail.com>
Date: Tue, 3 Aug 2021 10:50:39 +1000
Cc: secdir <secdir@ietf.org>, draft-ietf-httpbis-bcp56bis.all@ietf.org, HTTP Working Group <ietf-http-wg@w3.org>, last-call@ietf.org
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To: Joseph Salowey <joe@salowey.net>
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Subject: Re: [secdir] [Last-Call] Secdir last call review of draft-ietf-httpbis-bcp56bis-12
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Hi Joe,


> On 3 Aug 2021, at 6:33 am, Joseph Salowey <joe@salowey.net> wrote:
> [Joe]  I think we should deprecate MD5 in all cases and I also think =
you should treat digest as basic auth and run it over a secure channel =
in all cases.  The text update looks good. =20

There's been some... pushback on list since:
  https://www.w3.org/mid/2E8A6D6C-50DC-4753-916E-3AE43BBFECAE@mnot.net

Would you be comfortable if we just removed the discussion of digest and =
MD5 completely, and deferred action to an (eventual) update of 7616?

Cheers,



--
Mark Nottingham   https://www.mnot.net/


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Date: Mon, 2 Aug 2021 21:21:02 -0700
From: Benjamin Kaduk <kaduk@mit.edu>
To: tom petch <daedulus@btconnect.com>
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Subject: Re: [secdir] [Last-Call] Secdir last call review of draft-ietf-opsawg-l3sm-l3nm-10
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Hi Tom,

On Thu, Jul 29, 2021 at 05:10:00PM +0100, tom petch wrote:
> Reading this I-D, I wondered what the secdir view is of recommending the 
> use of MD5 to secure the session as this I-D does for BGP.  (Such a use 
> in NTP did generate a comment).

This part:

      'authentication':  The module adheres to the recommendations in
         Section 13.2 of [RFC4364] as it allows enabling TCP-AO
         [RFC5925] and accommodates the installed base that makes use of
         MD5.  In addition, the module includes a provision for the use

seems to be about as good as we can do given the current state of
deployment and implementation.

I will probably suggest adding some additional discussion of the weakness
of MD5 to the security considerations in my ballot comments, if no such
text appears before then.

Thanks,

Ben


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Reviewer: Derrell Piper
Review result: Ready

I have reviewed this document as part of the security directorate's
ongoing effort to review all IETF documents being processed by the IESG.
These comments were written primarily for the benefit of the security
area directors.  Document editors and WG chairs should treat these
comments just like any other last call comments.

The summary of the review is Ready.

Minor revision that updates RFC5888 to allow a port specification of 0.



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From: Joseph Salowey <joe@salowey.net>
Date: Tue, 3 Aug 2021 09:46:51 -0700
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--0000000000005e2d9905c8aa6faf
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On Mon, Aug 2, 2021 at 5:50 PM Mark Nottingham <mnot@mnot.net> wrote:

> Hi Joe,
>
>
> > On 3 Aug 2021, at 6:33 am, Joseph Salowey <joe@salowey.net> wrote:
> > [Joe]  I think we should deprecate MD5 in all cases and I also think you
> should treat digest as basic auth and run it over a secure channel in all
> cases.  The text update looks good.
>
> There's been some... pushback on list since:
>   https://www.w3.org/mid/2E8A6D6C-50DC-4753-916E-3AE43BBFECAE@mnot.net
>
> Would you be comfortable if we just removed the discussion of digest and
> MD5 completely, and deferred action to an (eventual) update of 7616?
>
>
[Joe]  The document is already down the path of adding normative language
around 7616 by requiring a secure channel just when using digest MD5.
 This guidance doesn't seem specific to the APIs case.  Why can't
the document improve the normative guidance to update to MUST NOT use MD5
and MUST use a secure channel with digest?



> Cheers,
>
>
>
> --
> Mark Nottingham   https://www.mnot.net/
>
>

--0000000000005e2d9905c8aa6faf
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><div class=3D"gmail_quote"><div=
 dir=3D"ltr" class=3D"gmail_attr">On Mon, Aug 2, 2021 at 5:50 PM Mark Notti=
ngham &lt;<a href=3D"mailto:mnot@mnot.net">mnot@mnot.net</a>&gt; wrote:<br>=
</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex">Hi Joe,<br>
<br>
<br>
&gt; On 3 Aug 2021, at 6:33 am, Joseph Salowey &lt;<a href=3D"mailto:joe@sa=
lowey.net" target=3D"_blank">joe@salowey.net</a>&gt; wrote:<br>
&gt; [Joe]=C2=A0 I think we should deprecate MD5 in all cases and I also th=
ink you should treat digest as basic auth and run it over a secure channel =
in all cases.=C2=A0 The text update looks good.=C2=A0 <br>
<br>
There&#39;s been some... pushback on list since:<br>
=C2=A0 <a href=3D"https://www.w3.org/mid/2E8A6D6C-50DC-4753-916E-3AE43BBFEC=
AE@mnot.net" rel=3D"noreferrer" target=3D"_blank">https://www.w3.org/mid/2E=
8A6D6C-50DC-4753-916E-3AE43BBFECAE@mnot.net</a><br>
<br>
Would you be comfortable if we just removed the discussion of digest and MD=
5 completely, and deferred action to an (eventual) update of 7616?<br>
<br></blockquote><div><br></div><div>[Joe]=C2=A0 The document is already=C2=
=A0down the path of=C2=A0adding normative language around 7616 by requiring=
 a secure channel just when using digest MD5.=C2=A0 =C2=A0This guidance doe=
sn&#39;t seem specific to the APIs case.=C2=A0 Why can&#39;t the=C2=A0docum=
ent improve the normative guidance to update to MUST NOT use MD5 and MUST u=
se a secure channel with digest?=C2=A0=C2=A0</div><div><br></div><div>=C2=
=A0<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Cheers,<br>
<br>
<br>
<br>
--<br>
Mark Nottingham=C2=A0 =C2=A0<a href=3D"https://www.mnot.net/" rel=3D"norefe=
rrer" target=3D"_blank">https://www.mnot.net/</a><br>
<br>
</blockquote></div></div>

--0000000000005e2d9905c8aa6faf--


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> On 4 Aug 2021, at 2:46 am, Joseph Salowey <joe@salowey.net> wrote:
>=20
> Would you be comfortable if we just removed the discussion of digest =
and MD5 completely, and deferred action to an (eventual) update of 7616?
>=20
>=20
> [Joe]  The document is already down the path of adding normative =
language around 7616 by requiring a secure channel just when using =
digest MD5.   This guidance doesn't seem specific to the APIs case.  Why =
can't the document improve the normative guidance to update to MUST NOT =
use MD5 and MUST use a secure channel with digest? =20

The proposal was to remove discussion of MD5 *and* digest, deferring to =
7616 (and an eventual update).

--
Mark Nottingham   https://www.mnot.net/


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See:
  https://github.com/httpwg/http-extensions/commit/9f3c2faa3

This fits in with the overall approach of the document -- as a BCP, =
we're shying away from placing requirements on implementations.=20

Cheers,


> On 4 Aug 2021, at 9:21 am, Mark Nottingham <mnot@mnot.net> wrote:
>=20
>=20
>=20
>> On 4 Aug 2021, at 2:46 am, Joseph Salowey <joe@salowey.net> wrote:
>>=20
>> Would you be comfortable if we just removed the discussion of digest =
and MD5 completely, and deferred action to an (eventual) update of 7616?
>>=20
>>=20
>> [Joe]  The document is already down the path of adding normative =
language around 7616 by requiring a secure channel just when using =
digest MD5.   This guidance doesn't seem specific to the APIs case.  Why =
can't the document improve the normative guidance to update to MUST NOT =
use MD5 and MUST use a secure channel with digest? =20
>=20
> The proposal was to remove discussion of MD5 *and* digest, deferring =
to 7616 (and an eventual update).
>=20
> --
> Mark Nottingham   https://www.mnot.net/
>=20
>=20

--
Mark Nottingham   https://www.mnot.net/


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--000000000000e4084705c8b50ed6
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On Tue, Aug 3, 2021 at 6:52 PM Mark Nottingham <mnot@mnot.net> wrote:

> See:
>   https://github.com/httpwg/http-extensions/commit/9f3c2faa3
>
> This fits in with the overall approach of the document -- as a BCP, we're
> shying away from placing requirements on implementations.
>
>
[Joe] Thanks, this looks good.


> Cheers,
>
>
> > On 4 Aug 2021, at 9:21 am, Mark Nottingham <mnot@mnot.net> wrote:
> >
> >
> >
> >> On 4 Aug 2021, at 2:46 am, Joseph Salowey <joe@salowey.net> wrote:
> >>
> >> Would you be comfortable if we just removed the discussion of digest
> and MD5 completely, and deferred action to an (eventual) update of 7616?
> >>
> >>
> >> [Joe]  The document is already down the path of adding normative
> language around 7616 by requiring a secure channel just when using digest
> MD5.   This guidance doesn't seem specific to the APIs case.  Why can't the
> document improve the normative guidance to update to MUST NOT use MD5 and
> MUST use a secure channel with digest?
> >
> > The proposal was to remove discussion of MD5 *and* digest, deferring to
> 7616 (and an eventual update).
> >
> > --
> > Mark Nottingham   https://www.mnot.net/
> >
> >
>
> --
> Mark Nottingham   https://www.mnot.net/
>
>

--000000000000e4084705c8b50ed6
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Tue, Aug 3, 2021 at 6:52 PM Mark N=
ottingham &lt;<a href=3D"mailto:mnot@mnot.net">mnot@mnot.net</a>&gt; wrote:=
<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">See:<br>
=C2=A0 <a href=3D"https://github.com/httpwg/http-extensions/commit/9f3c2faa=
3" rel=3D"noreferrer" target=3D"_blank">https://github.com/httpwg/http-exte=
nsions/commit/9f3c2faa3</a><br>
<br>
This fits in with the overall approach of the document -- as a BCP, we&#39;=
re shying away from placing requirements on implementations. <br>
<br></blockquote><div><br></div><div>[Joe] Thanks, this looks good.=C2=A0=
=C2=A0</div><div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"mar=
gin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1=
ex">
Cheers,<br>
<br>
<br>
&gt; On 4 Aug 2021, at 9:21 am, Mark Nottingham &lt;<a href=3D"mailto:mnot@=
mnot.net" target=3D"_blank">mnot@mnot.net</a>&gt; wrote:<br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt;&gt; On 4 Aug 2021, at 2:46 am, Joseph Salowey &lt;<a href=3D"mailto:jo=
e@salowey.net" target=3D"_blank">joe@salowey.net</a>&gt; wrote:<br>
&gt;&gt; <br>
&gt;&gt; Would you be comfortable if we just removed the discussion of dige=
st and MD5 completely, and deferred action to an (eventual) update of 7616?=
<br>
&gt;&gt; <br>
&gt;&gt; <br>
&gt;&gt; [Joe]=C2=A0 The document is already down the path of adding normat=
ive language around 7616 by requiring a secure channel just when using dige=
st MD5.=C2=A0 =C2=A0This guidance doesn&#39;t seem specific to the APIs cas=
e.=C2=A0 Why can&#39;t the document improve the normative guidance to updat=
e to MUST NOT use MD5 and MUST use a secure channel with digest?=C2=A0 <br>
&gt; <br>
&gt; The proposal was to remove discussion of MD5 *and* digest, deferring t=
o 7616 (and an eventual update).<br>
&gt; <br>
&gt; --<br>
&gt; Mark Nottingham=C2=A0 =C2=A0<a href=3D"https://www.mnot.net/" rel=3D"n=
oreferrer" target=3D"_blank">https://www.mnot.net/</a><br>
&gt; <br>
&gt; <br>
<br>
--<br>
Mark Nottingham=C2=A0 =C2=A0<a href=3D"https://www.mnot.net/" rel=3D"norefe=
rrer" target=3D"_blank">https://www.mnot.net/</a><br>
<br>
</blockquote></div></div>

--000000000000e4084705c8b50ed6--


From nobody Thu Aug  5 05:59:31 2021
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Review instructions and related resources are at:
http://tools.ietf.org/area/sec/trac/wiki/SecDirReview

For telechat 2021-08-12

Reviewer               LC end     Draft
Catherine Meadows      2021-07-07 draft-ietf-httpbis-cache-header
Christopher Wood      R2021-06-15 draft-ietf-6man-ipv6-alt-mark

Last calls:

Reviewer               LC end     Draft
Nancy Cam-Winget      R2021-06-28 draft-ietf-opsec-ipv6-eh-filtering
Steve Hanna            2021-03-22 draft-ietf-regext-secure-authinfo-transfer
Catherine Meadows      2021-04-14 draft-ietf-ntp-interleaved-modes
Catherine Meadows      2021-07-07 draft-ietf-httpbis-cache-header
Sandra Murphy          2020-10-15 draft-ietf-tls-external-psk-importer
Tim Polk               2021-08-06 draft-ietf-opsawg-vpn-common
Stefan Santesson       2021-08-11 draft-ietf-bier-te-arch
Yaron Sheffer          None       draft-ietf-lsr-pce-discovery-security-support
Melinda Shore          2021-08-11 draft-ietf-regext-epp-registry-maintenance
Valery Smyslov         None       draft-ietf-netconf-crypto-types
Robert Sparks          2021-08-09 draft-ietf-sacm-coswid
Mališa Vučinić         2021-06-10 draft-ietf-httpbis-semantics
Klaas Wierenga         2020-12-02 draft-ietf-core-echo-request-tag
Klaas Wierenga         2020-05-26 draft-ietf-kitten-krb-spake-preauth
Christopher Wood      R2021-06-15 draft-ietf-6man-ipv6-alt-mark
Paul Wouters           2021-06-10 draft-ietf-httpbis-messaging
Liang Xia              2021-03-17 draft-ietf-core-sid

Early review requests:

Reviewer               Due        Draft
Stephen Farrell        2021-06-21 draft-ietf-idr-bgpls-srv6-ext
Tina Tsou              2021-08-25 draft-ietf-opsawg-sbom-access
Sean Turner            2021-08-18 draft-ietf-taps-interface
Loganaden Velvindron   2021-08-18 draft-ietf-taps-arch

Next in the reviewer rotation:

  Samuel Weiler
  Brian Weis
  Klaas Wierenga
  Christopher Wood
  Paul Wouters
  Liang Xia
  Dacheng Zhang
  Derek Atkins
  John Bradley
  Nancy Cam-Winget


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Reviewer: Yaron Sheffer
Review result: Not Ready

This document defines a mechanism (a TLV) to advertise the PCE Protocol
security required (use of TCP-AO and its key ID, or alternatively use of TLS)
within the routing protocol being used.

* Sec. 3.1: I don't understand why "SHOULD advertise" and not MUST. Especially
given the strict client behavior defined later.

* Sec. 3.1: should we also say something about the case where both methods are
advertised, and whether we recommend for the client to use one of them over the
other?

* Sec. 4: typo (appears twice) - "to be carried in the PCED TLV of the for use".

* Sec. 7: this phrase appears to be essential to security of this mechanism:
"it MUST be insured that the IGP is protected for authentication and integrity
of the PCED TLV". I would expect more guidance: how can this property be
ensured in the relevant IGPs?

* Also, a possibly unintended consequence of this requirement is that if the
IGP cannot be protected in a particular deployment/product, this mechanism
would not be used. Please consider if this is likely to happen and whether we
want to forego PCEP transport security in such cases. My gut feel (not based on
experience in such networks) is that the threat models are different enough
that we should decouple the security of IGP from that of PCEP.



From nobody Fri Aug  6 11:44:24 2021
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To: Alexey Melnikov <aamelnikov@fastmail.fm>, secdir@ietf.org
Cc: last-call@ietf.org, netmod@ietf.org, draft-ietf-netmod-nmda-diff.all@ietf.org
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Subject: Re: [secdir] [netmod] Secdir last call review of draft-ietf-netmod-nmda-diff-09
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Hi Alexey,

thank you for your review and pointing out the nits (empty lines after
HTTP headers), which are addressed in -12. 

Kind regards

--- Alex

On 7/1/2021 5:58 AM, Alexey Melnikov via Datatracker wrote:
> Reviewer: Alexey Melnikov
> Review result: Has Nits
>
> I have reviewed this document as part of the security directorate's
> ongoing effort to review all IETF documents being processed by the
> IESG. These comments were written primarily for the benefit of the
> security area directors. Document editors and WG chairs should treat these
> comments just like any other last call comments.
>
> This document defines an RPC operation to compare management
> datastores that comply with the NMDA architecture.
> The Security Considerations talks about a couple of issues specific to
> the new operation:
> 1) sensitivity of the new "compare" operation and how access control rights
> to access it should be restricted.
> 2) performance considerations of running "compare" and
> how it can lead to Denial-of-Service, if the number of requests allowed
> in any given time interval is not restricted.
> I can't think of other security issues raised by this document that are
> missing from it.
>
> Nits:
>
> In Section 6:
>
>>   The same request in RESTCONF (using JSON format):
>>
>>   POST /restconf/operations/ietf-nmda-compare:compare HTTP/1.1
>>   Host: example.com
>>   Content-Type: application/yang-data+json
>>   Accept: application/yang-d
> Please insert an empty line after the HTTP request header and before the
> following payload, or your example is not syntactically valid.
>
> Also, I don't "application/yang-d" in the list of registered media types on
> <https://www.iana.org/assignments/media-types/media-types.xhtml>. Did I miss it?
>
>>   { "ietf-nmda-compare:input" {
>>      "source" : "ietf-datastores:operational",
>>      "target" : "ietf-datastores:intended",
>>      "report-origin" : null,
>>      "xpath-filter" : "/ietf-interfaces:interfaces"
>>      }
>>   }
>>
>>   The same response in RESTCONF (using JSON format):
>>
>>  HTTP/1.1 200 OK
>>  Date: Thu, 26 Jan 2019 20:56:30 GMT
>>  Server: example-server
>>  Content-Type: application/yang-d
> Similar to the above, you need an empty line inserted here.
>
>>  { "ietf-nmda-compare:output" : {
>>      "differences" : {
>>        "ietf-yang-patch:yang-patch" : {
>>          "patch-id" : "interface status",
>>          "comment" : "diff between intended (source) and operational",
>>          "edit" : [
>>            {
>>              "edit-id" : "1",
>>              "operation" : "replace",
>>              "target" : "/ietf-interfaces:interface=eth0/enabled",
>>              "value" : {
>>                 "ietf-interfaces:interface/enabled" : "false"
>>              },
>>              "source-value" : {
>>                 "ietf-interfaces:interface/enabled" : "true",
>>                 "@ietf-interfaces:interface/enabled" : {
>>                   "ietf-origin:origin" : "ietf-origin:learned"
>>                 }
>>               }
>>            },
>>            {
>>              "edit-id" : "2",
>>              "operation" : "create",
>>              "target" : "/ietf-interfaces:interface=eth0/description",
>>              "value" : {
>>                 "ietf-interface:interface/description" : "ip interface"
>>              }
>>            }
>>          ]
>>        }
>>      }
>>    }
>>  }
> Best Regards,
> Alexey
>
>
> _______________________________________________
> netmod mailing list
> netmod@ietf.org
> https://www.ietf.org/mailman/listinfo/netmod


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Reviewer: Melinda Shore
Review result: Has Issues

The security considerations section is scanty - transport security is not
described at all, nor is the question of defense against a malicious actor
spoofing a server.  It may be the case that there are, in fact, mitigations in
common use but they are not spelled out in this draft nor in RFC 5730 (and I’ll
be the first to admit that I may have missed something).  Because of this I do
have reservations about progressing the document towards publication.

Section 3.3: Is it the case that if an element is not explicitly identified as
optional, it’s mandatory?  If that’s the case you may want to mention that in
the first paragraph of this section

Nits:

There’s occasionally some unidiomatic English (for example, “The command
mappings described here are specifically for the use to notify [ … ]” rather
than, for example, “The command mappings described here are specifically used
to notify [ … ]”, “The information on a [ … ]” rather than “The information
about a [ … ], etc.),

Section 1, first paragraph:  It’s actually not very clear about what registries
are informing registrars.  It may be clearer to start with something along the
lines of “Registries usually inform registrars of maintenance activities in
different ways.”



From nobody Mon Aug  9 06:09:13 2021
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From: Qin Wu <bill.wu@huawei.com>
To: Yaron Sheffer <yaronf.ietf@gmail.com>, "secdir@ietf.org" <secdir@ietf.org>
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Thread-Topic: Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Date: Mon, 09 Aug 2021 16:44:15 +0300
From: Yaron Sheffer <yaronf.ietf@gmail.com>
To: Qin Wu <bill.wu@huawei.com>, "secdir@ietf.org" <secdir@ietf.org>
CC: "draft-ietf-lsr-pce-discovery-security-support.all@ietf.org" <draft-ietf-lsr-pce-discovery-security-support.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
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Thread-Topic: Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Subject: Re: [secdir] Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Hi Qin,

Thank you for your response.

* RFC 3567 (for IS-IS) is obsoleted by RFC 5304. Unfortunately RFC 5304 sti=
ll uses HMAC-MD5, which would be considered insecure nowadays.
* RFC 2154 is very old and Experimental (and only supports RSA-MD5 signatur=
es). I'm not an OSPF expert by any means, but I'm willing to bet that there =
are no production implementations of this RFC. (I'm willing to be proven wro=
ng). Is there another RFC that defines a protection mechanism for OSPF?

All in all, there appear to be no good options for the IGP.

To your last point, when I mentioned decoupling the mechanisms, I was sugge=
sting to use the extension you define even if the IGP *cannot* be secured. I=
f you think this is reasonable, please add such text to the Security Conside=
rations.

Thanks,
	Yaron

=EF=BB=BFOn 8/9/21, 16:09, "Qin Wu" <bill.wu@huawei.com> wrote:

    Thanks Yaron for valuable comments, please see my reply inline below.
    -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
    >=E5=8F=91=E4=BB=B6=E4=BA=BA: Yaron Sheffer via Datatracker [mailto:noreply@ietf.org]=20
    >=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2021=E5=B9=B48=E6=9C=886=E6=97=A5 3:25
    >=E6=94=B6=E4=BB=B6=E4=BA=BA: secdir@ietf.org
    >=E6=8A=84=E9=80=81: draft-ietf-lsr-pce-discovery-security-support.all@ietf.org; la=
st-call@ietf.org; lsr@ietf.org
    >=E4=B8=BB=E9=A2=98: Secdir last call review of draft-ietf-lsr-pce-discovery-securi=
ty-support-05

    >Reviewer: Yaron Sheffer
    >Review result: Not Ready

    >This document defines a mechanism (a TLV) to advertise the PCE Protoco=
l security required (use of TCP-AO and its key ID, or alternatively use of T=
LS) within the routing protocol being used.

    >* Sec. 3.1: I don't understand why "SHOULD advertise" and not MUST. Es=
pecially given the strict client behavior defined later.
    [Qin]: I believe "SHOULD advertise" is consistent with client behavior =
defined later, i.e., we apply SHOULD NOT language to the client behavior.
    I am not sure we should change it into strong language with MUST. Since=
 if IGP advertisement doesn't include TCP-AO
     support flag bit or TLS support flag bit, NMS may fall back to configu=
re both PCC and PCE server to support TCP-AO or TLS. That's one of reason I =
think why we choose to use SHOULD language.

    >* Sec. 3.1: should we also say something about the case where both met=
hods are advertised, and whether we recommend for the client to use one of t=
hem over the other?

    [Qin]: It is up to local policy, which has bee clarified in the end of =
section 3.1. Hope this clarify.

    >* Sec. 4: typo (appears twice) - "to be carried in the PCED TLV of the=
 for use".

    [Qin]:Thanks, have fixed them in the local copy.

    >* Sec. 7: this phrase appears to be essential to security of this mech=
anism: "it MUST be insured that the IGP is protected for authentication and =
integrity of the PCED TLV". I would expect more guidance: how can this prope=
rty be ensured in the relevant IGPs?
    [Qin]:I think mechanism defined in [RFC3567] and [RFC2154] can be used =
to ensure authenticity and integrity of OSPF LSAs or ISIS LSPs and their TLV=
s. Here is the proposed changes:
    OLD TEXT:
    "
       Thus before advertisement of
       the PCE security parameters, it MUST be insured that the IGP is
       protected for authentication and integrity of the PCED TLV if the
       mechanism described in this document is used.
    "
    NEW TEXT:
    "
       Thus before advertisement of
       the PCE security parameters, it MUST be insured that the IGP is
       protected for authentication and integrity of the PCED TLV with mech=
anisms defined in [RFC3567][RFC2154] if the
       mechanism described in this document is used.
    "
    >* Also, a possibly unintended consequence of this requirement is that =
if the IGP cannot be protected in a particular deployment/product, this mech=
anism would not be used. Please consider if this is likely to happen and whe=
ther we want to forego PCEP transport >security in such cases. My gut feel (=
not based on experience in such networks) is that the threat models are diff=
erent enough that we should decouple the security of IGP from that of PCEP.

    [Qin] I agree IGP security should be separated from PCEP security. IGP =
extension defined in this document is used by the PCC to select PCE server w=
ith appropriate security mechanism. On the other hand, Operator can either u=
se IGP advertisement for PCEP security capability or rely on local policy to=
 select PCE. If operator feels IGP advertisement is not secure, he can fall =
back to local policy or rely on manual configuration. Hope this clarifies.




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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Yaron Sheffer <yaronf.ietf@gmail.com>, Qin Wu <bill.wu@huawei.com>, "secdir@ietf.org" <secdir@ietf.org>
CC: "draft-ietf-lsr-pce-discovery-security-support.all@ietf.org" <draft-ietf-lsr-pce-discovery-security-support.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Date: Mon, 9 Aug 2021 15:36:03 +0000
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Yaron Sheffer <yaronf.ietf@gmail.com>, Qin Wu <bill.wu@huawei.com>, "secdir@ietf.org" <secdir@ietf.org>
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Thread-Topic: Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Subject: Re: [secdir] Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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From: Qin Wu <bill.wu@huawei.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Yaron Sheffer <yaronf.ietf@gmail.com>, "secdir@ietf.org" <secdir@ietf.org>
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Thread-Topic: Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Subject: Re: [secdir] Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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From: Qin Wu <bill.wu@huawei.com>
To: Yaron Sheffer <yaronf.ietf@gmail.com>, "secdir@ietf.org" <secdir@ietf.org>
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Thread-Topic: Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Date: Tue, 10 Aug 2021 14:25:39 +0300
From: Yaron Sheffer <yaronf.ietf@gmail.com>
To: Qin Wu <bill.wu@huawei.com>, "secdir@ietf.org" <secdir@ietf.org>
CC: "draft-ietf-lsr-pce-discovery-security-support.all@ietf.org" <draft-ietf-lsr-pce-discovery-security-support.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
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Thread-Topic: Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdir/at4IyLL1VgjumV4PwX1bLewq57c>
Subject: Re: [secdir] Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Hi Qin,

Sorry, but I find your latest proposed text very confusing, because we shou=
ld be focusing on integrity protection and not privacy (=3Dsecrecy) of the TLV=
. So I would prefer to keep the text as-is, with the addition of a reference=
 to the IS-IS and OSPF security mechanisms that were discussed on this threa=
d.

Thanks,
	Yaron

=EF=BB=BFOn 8/10/21, 05:00, "Qin Wu" <bill.wu@huawei.com> wrote:

    Hi, Yaron
    -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
    >=E5=8F=91=E4=BB=B6=E4=BA=BA: Yaron Sheffer [mailto:yaronf.ietf@gmail.com]=20
    >=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2021=E5=B9=B48=E6=9C=889=E6=97=A5 21:44
    >=E6=94=B6=E4=BB=B6=E4=BA=BA: Qin Wu <bill.wu@huawei.com>; secdir@ietf.org
    >=E6=8A=84=E9=80=81: draft-ietf-lsr-pce-discovery-security-support.all@ietf.org; la=
st-call@ietf.org; lsr@ietf.org
    >=E4=B8=BB=E9=A2=98: Re: Secdir last call review of draft-ietf-lsr-pce-discovery-se=
curity-support-05

    >Hi Qin,

    >Thank you for your response.

    >* RFC 3567 (for IS-IS) is obsoleted by RFC 5304. Unfortunately RFC 530=
4 still uses HMAC-MD5, which would be considered insecure nowadays.
    >* RFC 2154 is very old and Experimental (and only supports RSA-MD5 sig=
natures). I'm not an OSPF expert by any means, but I'm willing to bet that t=
here are no production implementations of this RFC. (I'm willing to be prove=
n wrong).=20
    >Is there another RFC that define a protection mechanism for OSPF?

    >All in all, there appear to be no good options for the IGP.

    [Qin Wu]Yes, we do have alternatives, see Les's response in the separat=
e email
    "
    On 8/9/21, 23:36,"Les Ginsberg (ginsberg)" <ginsberg@cisco.com> wrote:
    For IS-IS security please also see RFC 5310.
    For OSPF security please see RFC 5709.
    "
    >To your last point, when I mentioned decoupling the mechanisms, I was =
suggesting to use the extension you define even if the IGP *cannot* be secur=
ed. If you think this is reasonable, please add such text to the Security Co=
nsiderations.

    [Qin Wu] Okay, how about the following change
    OLD TEXT:
    "
    As stated in [RFC5088]
    and [RFC5089], the IGP do not provide encryption mechanism to protect
    the privacy of the PCED TLV, if this information can make the PCEP
    session less secure then the operator should take that into considerati=
on .
    "
    NEW TEXT:
    "
    As stated in [RFC5088]
    and [RFC5089], the IGP do not provide encryption mechanism to protect
    the privacy of the PCED TLV, if this information can make the PCEP
    session less secure then the operator should take that into considerati=
on=20
    when getting the mechanism described in this document deployed.
    "
     >Thanks,
     >	Yaron

    =EF=BB=BF>On 8/9/21, 16:09, "Qin Wu" <bill.wu@huawei.com> wrote:

      >   Thanks Yaron for valuable comments, please see my reply inline be=
low.
        -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
        >=E5=8F=91=E4=BB=B6=E4=BA=BA: Yaron Sheffer via Datatracker [mailto:noreply@ietf.org]=
=20
        >=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2021=E5=B9=B48=E6=9C=886=E6=97=A5 3:25
        >=E6=94=B6=E4=BB=B6=E4=BA=BA: secdir@ietf.org
        >=E6=8A=84=E9=80=81: draft-ietf-lsr-pce-discovery-security-support.all@ietf.org=
; last-call@ietf.org; lsr@ietf.org
        >=E4=B8=BB=E9=A2=98: Secdir last call review of draft-ietf-lsr-pce-discovery-se=
curity-support-05

        >Reviewer: Yaron Sheffer
        >Review result: Not Ready

        >This document defines a mechanism (a TLV) to advertise the PCE Pro=
tocol security required (use of TCP-AO and its key ID, or alternatively use =
of TLS) within the routing protocol being used.

        >* Sec. 3.1: I don't understand why "SHOULD advertise" and not MUST=
. Especially given the strict client behavior defined later.
        [Qin]: I believe "SHOULD advertise" is consistent with client behav=
ior defined later, i.e., we apply SHOULD NOT language to the client behavior=
.
        I am not sure we should change it into strong language with MUST. S=
ince if IGP advertisement doesn't include TCP-AO
         support flag bit or TLS support flag bit, NMS may fall back to con=
figure both PCC and PCE server to support TCP-AO or TLS. That's one of reaso=
n I think why we choose to use SHOULD language.

        >* Sec. 3.1: should we also say something about the case where both=
 methods are advertised, and whether we recommend for the client to use one =
of them over the other?

        [Qin]: It is up to local policy, which has bee clarified in the end=
 of section 3.1. Hope this clarify.

        >* Sec. 4: typo (appears twice) - "to be carried in the PCED TLV of=
 the for use".

        [Qin]:Thanks, have fixed them in the local copy.

        >* Sec. 7: this phrase appears to be essential to security of this =
mechanism: "it MUST be insured that the IGP is protected for authentication =
and integrity of the PCED TLV". I would expect more guidance: how can this p=
roperty be ensured in the relevant IGPs?
        [Qin]:I think mechanism defined in [RFC3567] and [RFC2154] can be u=
sed to ensure authenticity and integrity of OSPF LSAs or ISIS LSPs and their=
 TLVs. Here is the proposed changes:
        OLD TEXT:
        "
           Thus before advertisement of
           the PCE security parameters, it MUST be insured that the IGP is
           protected for authentication and integrity of the PCED TLV if th=
e
           mechanism described in this document is used.
        "
        NEW TEXT:
        "
           Thus before advertisement of
           the PCE security parameters, it MUST be insured that the IGP is
           protected for authentication and integrity of the PCED TLV with =
mechanisms defined in [RFC3567][RFC2154] if the
           mechanism described in this document is used.
        "
        >* Also, a possibly unintended consequence of this requirement is t=
hat if the IGP cannot be protected in a particular deployment/product, this =
mechanism would not be used. Please consider if this is likely to happen and=
 whether we want to forego PCEP transport >security in such cases. My gut fe=
el (not based on experience in such networks) is that the threat models are =
different enough that we should decouple the security of IGP from that of PC=
EP.

        [Qin] I agree IGP security should be separated from PCEP security. =
IGP extension defined in this document is used by the PCC to select PCE serv=
er with appropriate security mechanism. On the other hand, Operator can eith=
er use IGP advertisement for PCEP security capability or rely on local polic=
y to select PCE. If operator feels IGP advertisement is not secure, he can f=
all back to local policy or rely on manual configuration. Hope this clarifie=
s.






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From: Qin Wu <bill.wu@huawei.com>
To: Yaron Sheffer <yaronf.ietf@gmail.com>, "secdir@ietf.org" <secdir@ietf.org>
CC: "draft-ietf-lsr-pce-discovery-security-support.all@ietf.org" <draft-ietf-lsr-pce-discovery-security-support.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Date: Tue, 10 Aug 2021 16:57:39 +0300
From: Yaron Sheffer <yaronf.ietf@gmail.com>
To: Qin Wu <bill.wu@huawei.com>, "secdir@ietf.org" <secdir@ietf.org>
CC: "draft-ietf-lsr-pce-discovery-security-support.all@ietf.org" <draft-ietf-lsr-pce-discovery-security-support.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
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Thread-Topic: Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdir/0aLWIdv10kuXTpJTLNWsEkarijs>
Subject: Re: [secdir] Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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So let me suggest:

    Thus before advertisement of the PCE security parameters, it MUST be in=
sured that the IGP protects the authentication and integrity of the PCED TLV=
 using the mechanisms defined in=20
    [RFC5310] and [RFC5709], if the mechanism described in this document is=
 used.=20

    Moreover, as stated in [RFC5088] and [RFC5089], the IGP do not provide =
any encryption mechanisms to protect the secrecy of the PCED TLV, and the op=
erator must ensure that no private data is carried in the TLV, for example t=
hat key names do not reveal sensitive information about the network.

Thanks,
	Yaron

=EF=BB=BFOn 8/10/21, 15:01, "Qin Wu" <bill.wu@huawei.com> wrote:

    Yaron:
    Thank for clarification. I agree to keep the last sentence in the secon=
d paragraph of section 7 as is.
    But I prefer to add the addition references in the previous sentence as=
 follows:
    "
    Thus before advertisement of the PCE security parameters, it MUST be in=
sured that the IGP is
    protected for authentication and integrity of the PCED TLV,, with the m=
echanisms defined in=20
    [RFC5310] and [RFC5709] if the mechanism described in this document is =
used.=20

    As stated in [RFC5088] and [RFC5089], the IGP do not provide encryption=
 mechanism to protect
    the privacy of the PCED TLV, if this information can make the PCEP sess=
ion less secure then the operator should take that into consideration.
    "
    If you better wording, please let me know.

    -Qin
    -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
    =E5=8F=91=E4=BB=B6=E4=BA=BA: Yaron Sheffer [mailto:yaronf.ietf@gmail.com]=20
    =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2021=E5=B9=B48=E6=9C=8810=E6=97=A5 19:26
    =E6=94=B6=E4=BB=B6=E4=BA=BA: Qin Wu <bill.wu@huawei.com>; secdir@ietf.org
    =E6=8A=84=E9=80=81: draft-ietf-lsr-pce-discovery-security-support.all@ietf.org; las=
t-call@ietf.org; lsr@ietf.org
    =E4=B8=BB=E9=A2=98: Re: Secdir last call review of draft-ietf-lsr-pce-discovery-sec=
urity-support-05

    Hi Qin,

    Sorry, but I find your latest proposed text very confusing, because we =
should be focusing on integrity protection and not privacy (=3Dsecrecy) of the=
 TLV. So I would prefer to keep the text as-is, with the addition of a refer=
ence to the IS-IS and OSPF security mechanisms that were discussed on this t=
hread.

    Thanks,
    	Yaron

    =EF=BB=BFOn 8/10/21, 05:00, "Qin Wu" <bill.wu@huawei.com> wrote:

        Hi, Yaron
        -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
        >=E5=8F=91=E4=BB=B6=E4=BA=BA: Yaron Sheffer [mailto:yaronf.ietf@gmail.com]=20
        >=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2021=E5=B9=B48=E6=9C=889=E6=97=A5 21:44
        >=E6=94=B6=E4=BB=B6=E4=BA=BA: Qin Wu <bill.wu@huawei.com>; secdir@ietf.org
        >=E6=8A=84=E9=80=81: draft-ietf-lsr-pce-discovery-security-support.all@ietf.org=
; last-call@ietf.org; lsr@ietf.org
        >=E4=B8=BB=E9=A2=98: Re: Secdir last call review of draft-ietf-lsr-pce-discover=
y-security-support-05

        >Hi Qin,

        >Thank you for your response.

        >* RFC 3567 (for IS-IS) is obsoleted by RFC 5304. Unfortunately RFC=
 5304 still uses HMAC-MD5, which would be considered insecure nowadays.
        >* RFC 2154 is very old and Experimental (and only supports RSA-MD5=
 signatures). I'm not an OSPF expert by any means, but I'm willing to bet th=
at there are no production implementations of this RFC. (I'm willing to be p=
roven wrong).=20
        >Is there another RFC that define a protection mechanism for OSPF?

        >All in all, there appear to be no good options for the IGP.

        [Qin Wu]Yes, we do have alternatives, see Les's response in the sep=
arate email
        "
        On 8/9/21, 23:36,"Les Ginsberg (ginsberg)" <ginsberg@cisco.com> wro=
te:
        For IS-IS security please also see RFC 5310.
        For OSPF security please see RFC 5709.
        "
        >To your last point, when I mentioned decoupling the mechanisms, I =
was suggesting to use the extension you define even if the IGP *cannot* be s=
ecured. If you think this is reasonable, please add such text to the Securit=
y Considerations.

        [Qin Wu] Okay, how about the following change
        OLD TEXT:
        "
        As stated in [RFC5088]
        and [RFC5089], the IGP do not provide encryption mechanism to prote=
ct
        the privacy of the PCED TLV, if this information can make the PCEP
        session less secure then the operator should take that into conside=
ration .
        "
        NEW TEXT:
        "
        As stated in [RFC5088]
        and [RFC5089], the IGP do not provide encryption mechanism to prote=
ct
        the privacy of the PCED TLV, if this information can make the PCEP
        session less secure then the operator should take that into conside=
ration=20
        when getting the mechanism described in this document deployed.
        "
         >Thanks,
         >	Yaron

        =EF=BB=BF>On 8/9/21, 16:09, "Qin Wu" <bill.wu@huawei.com> wrote:

          >   Thanks Yaron for valuable comments, please see my reply inlin=
e below.
            -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
            >=E5=8F=91=E4=BB=B6=E4=BA=BA: Yaron Sheffer via Datatracker [mailto:noreply@ietf.=
org]=20
            >=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2021=E5=B9=B48=E6=9C=886=E6=97=A5 3:25
            >=E6=94=B6=E4=BB=B6=E4=BA=BA: secdir@ietf.org
            >=E6=8A=84=E9=80=81: draft-ietf-lsr-pce-discovery-security-support.all@ietf=
.org; last-call@ietf.org; lsr@ietf.org
            >=E4=B8=BB=E9=A2=98: Secdir last call review of draft-ietf-lsr-pce-discover=
y-security-support-05

            >Reviewer: Yaron Sheffer
            >Review result: Not Ready

            >This document defines a mechanism (a TLV) to advertise the PCE=
 Protocol security required (use of TCP-AO and its key ID, or alternatively =
use of TLS) within the routing protocol being used.

            >* Sec. 3.1: I don't understand why "SHOULD advertise" and not =
MUST. Especially given the strict client behavior defined later.
            [Qin]: I believe "SHOULD advertise" is consistent with client b=
ehavior defined later, i.e., we apply SHOULD NOT language to the client beha=
vior.
            I am not sure we should change it into strong language with MUS=
T. Since if IGP advertisement doesn't include TCP-AO
             support flag bit or TLS support flag bit, NMS may fall back to=
 configure both PCC and PCE server to support TCP-AO or TLS. That's one of r=
eason I think why we choose to use SHOULD language.

            >* Sec. 3.1: should we also say something about the case where =
both methods are advertised, and whether we recommend for the client to use =
one of them over the other?

            [Qin]: It is up to local policy, which has bee clarified in the=
 end of section 3.1. Hope this clarify.

            >* Sec. 4: typo (appears twice) - "to be carried in the PCED TL=
V of the for use".

            [Qin]:Thanks, have fixed them in the local copy.

            >* Sec. 7: this phrase appears to be essential to security of t=
his mechanism: "it MUST be insured that the IGP is protected for authenticat=
ion and integrity of the PCED TLV". I would expect more guidance: how can th=
is property be ensured in the relevant IGPs?
            [Qin]:I think mechanism defined in [RFC3567] and [RFC2154] can =
be used to ensure authenticity and integrity of OSPF LSAs or ISIS LSPs and t=
heir TLVs. Here is the proposed changes:
            OLD TEXT:
            "
               Thus before advertisement of
               the PCE security parameters, it MUST be insured that the IGP=
 is
               protected for authentication and integrity of the PCED TLV i=
f the
               mechanism described in this document is used.
            "
            NEW TEXT:
            "
               Thus before advertisement of
               the PCE security parameters, it MUST be insured that the IGP=
 is
               protected for authentication and integrity of the PCED TLV w=
ith mechanisms defined in [RFC3567][RFC2154] if the
               mechanism described in this document is used.
            "
            >* Also, a possibly unintended consequence of this requirement =
is that if the IGP cannot be protected in a particular deployment/product, t=
his mechanism would not be used. Please consider if this is likely to happen=
 and whether we want to forego PCEP transport >security in such cases. My gu=
t feel (not based on experience in such networks) is that the threat models =
are different enough that we should decouple the security of IGP from that o=
f PCEP.

            [Qin] I agree IGP security should be separated from PCEP securi=
ty. IGP extension defined in this document is used by the PCC to select PCE =
server with appropriate security mechanism. On the other hand, Operator can =
either use IGP advertisement for PCEP security capability or rely on local p=
olicy to select PCE. If operator feels IGP advertisement is not secure, he c=
an fall back to local policy or rely on manual configuration. Hope this clar=
ifies.








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From: Qin Wu <bill.wu@huawei.com>
To: Yaron Sheffer <yaronf.ietf@gmail.com>, "secdir@ietf.org" <secdir@ietf.org>
CC: "draft-ietf-lsr-pce-discovery-security-support.all@ietf.org" <draft-ietf-lsr-pce-discovery-security-support.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
Thread-Index: AdeN8VBaao4BcToNQmG4p4waGPgvAw==
Date: Tue, 10 Aug 2021 14:09:56 +0000
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Subject: Re: [secdir] Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Subject: [secdir] Secdir telechat review of draft-ietf-6man-ipv6-alt-mark-08
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Reviewer: Christopher Wood
Review result: Ready

This draft seems ready. The latest revisions of this draft address all comments
from my previous review. Thanks for the updated text!



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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Qin Wu <bill.wu@huawei.com>, Yaron Sheffer <yaronf.ietf@gmail.com>, "secdir@ietf.org" <secdir@ietf.org>
CC: "draft-ietf-lsr-pce-discovery-security-support.all@ietf.org" <draft-ietf-lsr-pce-discovery-security-support.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Subject: Re: [secdir] Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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From: Qin Wu <bill.wu@huawei.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Yaron Sheffer <yaronf.ietf@gmail.com>, secdir <secdir@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdir/bwc4ktFVVSZgTPjBeF2f9cjUeKM>
Subject: Re: [secdir] Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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From: Jody Kolker <jkolker@godaddy.com>
To: Melinda Shore <melinda.shore@nomountain.net>, "secdir@ietf.org" <secdir@ietf.org>
CC: "draft-ietf-regext-epp-registry-maintenance.all@ietf.org" <draft-ietf-regext-epp-registry-maintenance.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>, "regext@ietf.org" <regext@ietf.org>
Thread-Topic: Secdir last call review of draft-ietf-regext-epp-registry-maintenance-16
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Date: Wed, 11 Aug 2021 14:21:52 +0000
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: tom petch <ietfc@btconnect.com>, Yaron Sheffer <yaronf.ietf@gmail.com>, Qin Wu <bill.wu@huawei.com>, "secdir@ietf.org" <secdir@ietf.org>
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Subject: Re: [secdir] Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Reviewer: Robert Sparks
Review result: Has Issues

I have reviewed this document as part of the security directorate's ongoing
effort to review all IETF documents being processed by the IESG. These comments
were written primarily for the benefit of the security area directors. Document
editors and WG chairs should treat these comments just like any other last call
comments.

This document has issues to address before publication as a Proposed Standard
RFC.

Summary:

This document defines a representation of software identification using CBOR
leveraging COSE. It attempts to reflect what can be represented with SWIDs XML
to the degree possible, and is capable of representing things that SWID cannot.

The SWID specification is behind a paywall. I have not read it, and cannot
comment on whether there are security considerations discussed there that are
well known by people with a lot of experience with this technology which may
not be explicitly reflected in this document by way of omission-because-obvious.

Ambiguity in the SWID spec is explicitly imported as ambiguity in this one
(see, in particular, the definition of "media (index 10)".

The considerations section spends some time discussing challenges around
signature validation, particularly with a declared out-of-scope identification
of a need for "an association between the signature and the tag's entity item
associated corresponding to the software provider." I am not yet comfortable
that I understand the ramifications of this discussion, and encourage the ADs
to look closely.

Major Issue:

This document needs to discuss privacy issues around the creation, transport,
and storage of CoSWID objects. I suggest leaning on the style of the discussion
in the security considerations section of RFC8412, noting the potential issues
with identifying the primary user of a system, that user's rights on the
system, and (when evidence is present) exposure of runtime information.

Should there be discussion of recovery from loss of control of the signing
credentials specific to CoSWID? For example, would a tag-id have to be
abandoned after such a loss?

Minor Issues:

In section 2.1, do you want to constrain names that can be registered to a
subset of what validates as NMToken? What XML allows there may be surprising.
There may also be a need to inspect what you're pointing to for a definition.
If you follow the current reference
(https://www.w3.org/TR/2004/REC-xmlschema-2-20041028), you have to follow
through to the obsoleted https://www.w3.org/TR/2000/WD-xml-2e-20000814, which
in the expansion of NMToken allows a wide range of things by way of
CombiningChar and Extender. Note that the rules in the current spec at
https://www.w3.org/TR/xml/#NT-Nmtoken and
https://www.w3.org/TR/xml/#NT-NameChar have a different production. Your point
is to make sure that anything you register will survive parsing when used in
SWID, so restricting to an even smaller subset should be ok. And fwiw, your
capitalization "NMToken" doesn't match any of the inconsistent variants of the
production in the referenced doc.

At 2.6 reg-id (index 32) you say "The scope SHOULD be the scope of an
organization." Could you add some text motivating why, and what trouble arises
from using other scopes? Or would the sentence be better stated as "The scope
will usually be the scope of an organization."?

At 2.9.1 I worry that "The hash-value byte string value MUST represent the raw
hash value of the hashed resource generated using the hash algorithm indicated
by the hash-alg-id." is underspecified. The diagram in RC6920 section 6 and
some of its examples convey what's meant a little better perhaps. Is there a
way to help avoid getting a string that looks like
"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"?

Consider RFC6648 (BCP 178) where you are reserving "x_" name prefixes for
private use.

Consider setting the contact for the IANA registrations to a group, area, or
the IESG instead of a person.

Nits:

This sentence really needs this comma:

  OLD: In the context of software tagging software patching and updating differ
  in an important way.

  NEW: In the context of software tagging, software patching and updating
  differ in an important way.

In section 2, I suggest:

  OLD: As such, it is not always possible to mechanically translate between
  corresponding attribute names in the two formats.  In such cases, a manual
  mapping will need to be used.

  NEW: As such, it is not always possible to simply transform corresponding
  attribute names between the two formats. In such cases, an explicitly
  provided mapping will need to be used.

Consider repeating the observation of SWIDs lack of advice about media
(provided in section 2.3) when it comes up in 2.4.




From nobody Thu Aug 12 03:27:10 2021
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Review instructions and related resources are at:
http://tools.ietf.org/area/sec/trac/wiki/SecDirReview

For telechat 2021-08-12

Reviewer               LC end     Draft
Catherine Meadows      2021-07-07 draft-ietf-httpbis-cache-header

For telechat 2021-08-26

Reviewer               LC end     Draft
Stefan Santesson       2021-08-11 draft-ietf-bier-te-arch

Last calls:

Reviewer               LC end     Draft
Nancy Cam-Winget      R2021-06-28 draft-ietf-opsec-ipv6-eh-filtering
Steve Hanna            2021-03-22 draft-ietf-regext-secure-authinfo-transfer
David Mandelberg      RNone       draft-ietf-lwig-minimal-esp
Catherine Meadows      2021-04-14 draft-ietf-ntp-interleaved-modes
Catherine Meadows      2021-07-07 draft-ietf-httpbis-cache-header
Sandra Murphy          2020-10-15 draft-ietf-tls-external-psk-importer
Tim Polk               2021-08-06 draft-ietf-opsawg-vpn-common
Stefan Santesson       2021-08-11 draft-ietf-bier-te-arch
Valery Smyslov         None       draft-ietf-netconf-crypto-types
Mališa Vučinić         2021-06-10 draft-ietf-httpbis-semantics
Samuel Weiler          2021-08-25 draft-ietf-alto-path-vector
Brian Weis             2021-08-19 draft-ietf-dnsop-svcb-https
Klaas Wierenga         2020-12-02 draft-ietf-core-echo-request-tag
Klaas Wierenga         2020-05-26 draft-ietf-kitten-krb-spake-preauth
Paul Wouters           2021-06-10 draft-ietf-httpbis-messaging
Liang Xia              2021-03-17 draft-ietf-core-sid

Early review requests:

Reviewer               Due        Draft
Stephen Farrell        2021-06-21 draft-ietf-idr-bgpls-srv6-ext
Tina Tsou              2021-08-25 draft-ietf-opsawg-sbom-access
Sean Turner            2021-08-18 draft-ietf-taps-interface
Loganaden Velvindron   2021-08-18 draft-ietf-taps-arch

Next in the reviewer rotation:

  Klaas Wierenga
  Christopher Wood
  Paul Wouters
  Liang Xia
  Dacheng Zhang
  Derek Atkins
  John Bradley
  Nancy Cam-Winget
  Shaun Cooley
  Alan DeKok


From nobody Thu Aug 12 12:25:56 2021
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Date: Thu, 12 Aug 2021 12:25:36 -0700
From: Benjamin Kaduk <kaduk@mit.edu>
To: Robert Sparks <rjsparks@nostrum.com>
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Subject: Re: [secdir] [Last-Call] Secdir last call review of draft-ietf-6lo-plc-05
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Hi Robert,

Many thanks for this review; I entered a discuss ballot for some of the
topics you identified.

-Ben

On Sun, Feb 14, 2021 at 02:50:09PM -0800, Robert Sparks via Datatracker wrote:
> Reviewer: Robert Sparks
> Review result: Has Issues
> 
> I have reviewed this document as part of the security directorate's ongoing
> effort to review all IETF documents being processed by the IESG. These comments
> were written primarily for the benefit of the security area directors. Document
> editors and WG chairs should treat these comments just like any other last call
> comments.
> 
> This document has issues that should be addressed before publication as
> Proposed Standard RFC.
> 
> Document reviewed: draft-ietf-6lo-plc-05
> 
> This document's primary point is to standardize mappings of ipv6 identifiers
> for using ipv6 over IEEE 1901.1, 1901.2, and IT-T G.9903 networks.
> 
> Those standards are not publicy available, and I have not reviewed how these
> mappings and the security mechanisms in those protocols interact.
> 
> The document has content that is not needed for its purpose. Section 5 in
> particular might be useful in an informational RFC, but is has no impact on
> someone implementing what this document is trying to standardize.
> 
> The security considerations section speaks primarily to generic considerations
> for 6lo-like networks. There is no specific discussion of the impact of the
> identifier mappings with the underlying protocols, in particular the
> constraints that don't allow using the full number of bits of entropy in the
> identifiers in those underlying protocols. There is only a passing mention of
> RFC8065.
> 
> Implementors are advised to "look at" RFC8604 when considering building stable
> addresses, but this document specifies doing things that RFC8604 recommends
> against (see the use of RFC2464, for example). More discussion seems warranted.
> 
> There is a short mention of the possibility of acquiring a network encryption
> key during onboarding but there's no discussion about what that means for these
> specific layer-2 protocols.
> 
> Editorial comments:
> 
> At section 4.6, the first paragraph can make its point more clearly. All that's
> needed to say is that the lower layers handle segmentation and reassembly, but
> the adaptation layer still needs to be ready to do so in the lower layer cant
> handle the 1280 octet MTU. At the last paragraph, when you say "referring to"
> do you mean "as specified in"?
> 
> At section 7, "For security consideration, link layer security is guaranteed in
> every PLC technology." needs clarification. Do you mean the three protocols
> discussed here provide link layer security? Or do you mean to say that if
> anyone plans to provide an adaptation layer to some other PLC protocol, that it
> must provide link layer security? Or do you mean something else?
> 
> Nit: Expand LLN on first use.
> 
> 
> -- 
> last-call mailing list
> last-call@ietf.org
> https://www.ietf.org/mailman/listinfo/last-call


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To: iesg@ietf.org, secdir@ietf.org, draft-ietf-lwig-minimal-esp.all@ietf.org
From: David Mandelberg <david@mandelberg.org>
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Subject: [secdir] secdir review of draft-ietf-lwig-minimal-esp-06
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I have reviewed this document as part of the security directorate's
ongoing effort to review all IETF documents being processed by the
IESG.  These comments were written primarily for the benefit of the
security area directors.  Document editors and WG chairs should treat
these comments just like any other last call comments.

The summary of the review is Ready.


From nobody Thu Aug 12 18:21:49 2021
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From: Qin Wu <bill.wu@huawei.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, tom petch <ietfc@btconnect.com>, Yaron Sheffer <yaronf.ietf@gmail.com>, "secdir@ietf.org" <secdir@ietf.org>
CC: "draft-ietf-lsr-pce-discovery-security-support.all@ietf.org" <draft-ietf-lsr-pce-discovery-security-support.all@ietf.org>
Thread-Topic: Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Date: Fri, 13 Aug 2021 01:21:34 +0000
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Subject: Re: [secdir] Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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From: "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
Date: Sat, 14 Aug 2021 16:42:39 +0900
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To: Paul Wouters <paul@nohats.ca>
Cc: secdir@ietf.org, "i2nsf@ietf.org" <i2nsf@ietf.org>, Last Call <last-call@ietf.org>, Roman Danyliw <rdd@cert.org>, skku-iotlab-members <skku-iotlab-members@googlegroups.com>,  "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
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Subject: Re: [secdir] Secdir last call review of draft-ietf-i2nsf-capability-data-model-16
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Hi Paul,
Here are the revision letter and revised draft reflecting your comments.

https://datatracker.ietf.org/doc/html/draft-ietf-i2nsf-capability-data-model-17

You can find my responses to your comments from page 36 in the revision
letter.

Patrick and I worked together for this revision.

Please let me know whether this version satisfies your comments or not.

Thanks.

Best Regards,
Paul Jeong


On Wed, May 19, 2021 at 5:16 AM Paul Wouters via Datatracker <
noreply@ietf.org> wrote:

> Reviewer: Paul Wouters
> Review result: Has Nits
>
> I have reviewed this document as part of the security directorate's
> ongoing
> effort to review all IETF documents being processed by the  IESG.  These
> comments were written primarily for the benefit of the security area
> directors.
>  Document editors and WG chairs should treat these comments just like any
> other
> last call comments.
>
> The summary of the review Has Nits
>
> The issues that  Michael Scharf raised regarding TOS have been addressed.
> Thank
> you. I have no items that are serious issues, just some comments that you
> may
> take into consideration for a minor update.
>
> Nits:
>
> The privacy section talks about a trade-off between privacy and security.
> But I
> do not understand what trade-off is meant. The document does not seem to
> make
> any trade-off. It just defines capabilities that can be used, some of which
> might process private material. But the trade-offs of that are really at
> the
> protocol level (like they did use TLS or IPsec or why not). I dont think
> describing technical capabilities is a trade-off of security vs privacy.
> Perhaps the section could talk about the discovery and/or usage of
> capabilities
> and that those capabilities handling private information should attempt to
> report their usage/findings/events underst conditions that preserve the
> privacy
> (eg require TLS or IPsec between SG and NSF ?)
>
> The Security section talks about layers that "can use" SSH or TLS for
> security.
> I'm not sure why it does not say SHOULD or MUST ? I would rewrite "need to
> be
> tightly secured and monitored" to "MUST be tightly secured, monitored and
> audited".
>
> Section 3.1 states:
>
>     These capabilities MAY have their access control restricted by a
> policy;
>
> In light of the other recommendations in the Security Section, I think
> this MAY
> should really be a SHOULD or even MUST. Alternatively, perhaps say "Some of
> these capabilities SHOULD" ?
>
>
>
>
>
>
>

--00000000000001fa3305c9801f21
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div id=3D"gmail-:2le" class=3D"gmail-Am gmail-aO9 gmail-A=
l editable gmail-LW-avf gmail-tS-tW gmail-tS-tY" aria-label=3D"Message Body=
" role=3D"textbox" aria-multiline=3D"true" tabindex=3D"1" style=3D"directio=
n:ltr;min-height:85px">Hi Paul,<div>Here are the revision letter and revise=
d draft reflecting your comments.</div><div><br></div><div><a href=3D"https=
://datatracker.ietf.org/doc/html/draft-ietf-i2nsf-capability-data-model-17"=
>https://datatracker.ietf.org/doc/html/draft-ietf-i2nsf-capability-data-mod=
el-17</a><br></div><div><br></div><div>You can find my responses to your co=
mments from page=C2=A036 in the revision letter.</div><div><br></div><div>P=
atrick and I worked together for=C2=A0this revision.</div><div><br></div><d=
iv>Please let me know whether this version satisfies your comments or not.<=
/div><div><br></div><div>Thanks.</div><div><br></div><div>Best Regards,</di=
v><div>Paul Jeong</div><div><br></div></div></div><br><div class=3D"gmail_q=
uote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, May 19, 2021 at 5:16 AM=
 Paul Wouters via Datatracker &lt;<a href=3D"mailto:noreply@ietf.org">norep=
ly@ietf.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex">Reviewer: Paul Wouters<br>
Review result: Has Nits<br>
<br>
I have reviewed this document as part of the security directorate&#39;s=C2=
=A0 ongoing<br>
effort to review all IETF documents being processed by the=C2=A0 IESG.=C2=
=A0 These<br>
comments were written primarily for the benefit of the security area direct=
ors.<br>
=C2=A0Document editors and WG chairs should treat these comments just like =
any other<br>
last call comments.<br>
<br>
The summary of the review Has Nits<br>
<br>
The issues that=C2=A0 Michael Scharf raised regarding TOS have been address=
ed. Thank<br>
you. I have no items that are serious issues, just some comments that you m=
ay<br>
take into consideration for a minor update.<br>
<br>
Nits:<br>
<br>
The privacy section talks about a trade-off between privacy and security. B=
ut I<br>
do not understand what trade-off is meant. The document does not seem to ma=
ke<br>
any trade-off. It just defines capabilities that can be used, some of which=
<br>
might process private material. But the trade-offs of that are really at th=
e<br>
protocol level (like they did use TLS or IPsec or why not). I dont think<br=
>
describing technical capabilities is a trade-off of security vs privacy.<br=
>
Perhaps the section could talk about the discovery and/or usage of capabili=
ties<br>
and that those capabilities handling private information should attempt to<=
br>
report their usage/findings/events underst conditions that preserve the pri=
vacy<br>
(eg require TLS or IPsec between SG and NSF ?)<br>
<br>
The Security section talks about layers that &quot;can use&quot; SSH or TLS=
 for security.<br>
I&#39;m not sure why it does not say SHOULD or MUST ? I would rewrite &quot=
;need to be<br>
tightly secured and monitored&quot; to &quot;MUST be tightly secured, monit=
ored and<br>
audited&quot;.<br>
<br>
Section 3.1 states:<br>
<br>
=C2=A0 =C2=A0 These capabilities MAY have their access control restricted b=
y a policy;<br>
<br>
In light of the other recommendations in the Security Section, I think this=
 MAY<br>
should really be a SHOULD or even MUST. Alternatively, perhaps say &quot;So=
me of<br>
these capabilities SHOULD&quot; ?<br>
<br>
<br>
<br>
<br>
<br>
<br>
</blockquote></div>

--00000000000001fa3305c9801f21--

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From nobody Sat Aug 14 08:30:19 2021
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Date: Sat, 14 Aug 2021 11:29:56 -0400 (EDT)
From: Paul Wouters <paul@nohats.ca>
To: "Mr. Jaehoon Paul Jeong" <jaehoon.paul@gmail.com>
cc: secdir@ietf.org, "i2nsf@ietf.org" <i2nsf@ietf.org>,  Last Call <last-call@ietf.org>, Roman Danyliw <rdd@cert.org>,  skku-iotlab-members <skku-iotlab-members@googlegroups.com>
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Subject: Re: [secdir] Secdir last call review of draft-ietf-i2nsf-capability-data-model-16
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On Sat, 14 Aug 2021, Mr. Jaehoon Paul Jeong wrote:

> Hi Paul,Here are the revision letter and revised draft reflecting your comments.
> 
> https://datatracker.ietf.org/doc/html/draft-ietf-i2nsf-capability-data-model-17
> 
> You can find my responses to your comments from page 36 in the revision letter.
> 
> Patrick and I worked together for this revision.
> 
> Please let me know whether this version satisfies your comments or not.

Thanks, looks good to me!

Paul W


From nobody Sat Aug 14 13:56:49 2021
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Subject: [secdir] [new-work] WG Review: Application-Layer Traffic Optimization (alto)
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The Application-Layer Traffic Optimization (alto) WG in the Transport Area of
the IETF is undergoing rechartering. The IESG has not made any determination
yet. The following draft charter was submitted, and is provided for
informational purposes only. Please send your comments to the IESG mailing
list (iesg@ietf.org) by 2021-08-23.

Application-Layer Traffic Optimization (alto)
-----------------------------------------------------------------------
Current status: Active WG

Chairs:
  Jan Seedorf <ietf@j-f-s.de>
  Qin Wu <bill.wu@huawei.com>

Assigned Area Director:
  Martin Duke <martin.h.duke@gmail.com>

Transport Area Directors:
  Martin Duke <martin.h.duke@gmail.com>
  Zaheduzzaman Sarker <Zaheduzzaman.Sarker@ericsson.com>

Mailing list:
  Address: alto@ietf.org
  To subscribe: https://www.ietf.org/mailman/listinfo/alto
  Archive: https://mailarchive.ietf.org/arch/browse/alto/

Group page: https://datatracker.ietf.org/group/alto/

Charter: https://datatracker.ietf.org/doc/charter-ietf-alto/

The ALTO working group was established in 2008 to devise a request/response
protocol to allow a host to choose optimal paths to resources from a server
with more knowledge of the network. The working group developed an HTTP-based
protocol, and reported proof-of-concepts of ALTO based solutions supporting
applications such as content distribution networks (CDN).

To support current and future deployments of ALTO, the working group is now
chartered for the following activities:

o Collect implementation deployment and experience. It is hoped that ALTO
practitioners will report their experiences on the mailing list, and the
working group will track implementation and deployment reports on a wiki or
in an Internet-Draft not expected to be published as an RFC. This will
motivate further work to extend and improve ALTO.

o Perform protocol maintenance for the existing published protocol.

o Develop operational support tools for ALTO. Based on experience from
deployments, the advice in RFC 7971, and the latest opinions and techniques
from the Operations and Management Area, the working group will develop tools
to configure, operate, and manage the ALTO protocol and networks that use
ALTO. This may include YANG models and OAM mechanisms, in consultation with
the OPS area and the IPPM WG. The working group may also update RFC 7971 in
the light of new experience and protocol features that were added to ALTO
after that RFC was published.

o Support for modern transport protocols. ALTO only uses the capabilities of
HTTP version 1. Since then, the IETF has developed HTTP/2 and HTTP/3. The
working group will develop any necessary protocol extensions and guidance to
support the use of ALTO over HTTP/2 and HTTP/3.

o Future use cases. The working group will provide a forum to discuss
possible future use cases. The objective of this discussion will be to
determine a small set of use cases that have strong support and a realistic
chance of implementation and deployment. The working group will not develop
protocol extensions for these use cases until it has been re-chartered
specifically for that purpose.

At the conclusion of the OAM and HTTP2/3 deliverables, plus completion of any
adopted drafts emerging from the other work items, the working group will
close or recharter.

Milestones:

  Mar 2022 - Support Document for ALTO over HTTP/2 and /3

  Aug 2022 - Wiki or internet-draft on ALTO deployments and challenges

  Aug 2022 - ALTO YANG Model



_______________________________________________
new-work mailing list
new-work@ietf.org
https://www.ietf.org/mailman/listinfo/new-work


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Reviewer: Nancy Cam-Winget
Review result: Ready

I have reviewed version -08 based on comments I'd provided on -06 and thank the
authors for addressing most of my comments. I find -08 in general to be ready
but would like to see Tim Chown's nits to also be addressed.



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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Qin Wu <bill.wu@huawei.com>, tom petch <ietfc@btconnect.com>, "Yaron Sheffer" <yaronf.ietf@gmail.com>, "secdir@ietf.org" <secdir@ietf.org>
CC: "draft-ietf-lsr-pce-discovery-security-support.all@ietf.org" <draft-ietf-lsr-pce-discovery-security-support.all@ietf.org>
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Date: Mon, 16 Aug 2021 20:32:56 +0000
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From: Qin Wu <bill.wu@huawei.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, tom petch <ietfc@btconnect.com>, Yaron Sheffer <yaronf.ietf@gmail.com>, "secdir@ietf.org" <secdir@ietf.org>
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Thread-Topic: Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Subject: Re: [secdir] Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Date: Tue, 17 Aug 2021 10:15:07 +0300
From: Yaron Sheffer <yaronf.ietf@gmail.com>
To: Qin Wu <bill.wu@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>, tom petch <ietfc@btconnect.com>, "secdir@ietf.org" <secdir@ietf.org>
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Subject: Re: [secdir] Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Looks good to me. Thank you!

	Yaron

=EF=BB=BFOn 8/17/21, 03:17, "Qin Wu" <bill.wu@huawei.com> wrote:

    Sorry for late followup, here is the update, the diff is
    https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-lsr-pce-discovery-security=
-support-06
    Yaron, let authors know if your comments are addressed in v-06.
    Thanks!

    -Qin
    -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
    =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:acee@cisco.com]=20
    =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2021=E5=B9=B48=E6=9C=8817=E6=97=A5 4:33
    =E6=94=B6=E4=BB=B6=E4=BA=BA: Qin Wu <bill.wu@huawei.com>; tom petch <ietfc@btconnect.com>=
; Yaron Sheffer <yaronf.ietf@gmail.com>; secdir@ietf.org
    =E6=8A=84=E9=80=81: draft-ietf-lsr-pce-discovery-security-support.all@ietf.org
    =E4=B8=BB=E9=A2=98: Re: Secdir last call review of draft-ietf-lsr-pce-discovery-sec=
urity-support-05

    Hi Qin,=20

    Can you publish a revision so that Yaron assure it satisfies his commen=
ts?=20

    Thanks,
    Acee

    =EF=BB=BFOn 8/12/21, 9:21 PM, "Qin Wu" <bill.wu@huawei.com> wrote:

        Thanks Acee and Tom for good suggestion, we will take them into acc=
ount.

        -Qin
        -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
        =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:acee@cisco.com]=20
        =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2021=E5=B9=B48=E6=9C=8812=E6=97=A5 1:18
        =E6=94=B6=E4=BB=B6=E4=BA=BA: tom petch <ietfc@btconnect.com>; Yaron Sheffer <yaronf.i=
etf@gmail.com>; Qin Wu <bill.wu@huawei.com>; secdir@ietf.org
        =E6=8A=84=E9=80=81: draft-ietf-lsr-pce-discovery-security-support.all@ietf.org
        =E4=B8=BB=E9=A2=98: Re: Secdir last call review of draft-ietf-lsr-pce-discovery=
-security-support-05

        I'd also recommend changing, "key names" to "key-ids or key-chain n=
ames" since this is what is actually being advertised.
        Thanks,
        Acee

        On 8/10/21, 11:53 AM, "tom petch" <ietfc@btconnect.com> wrote:

            From: Lsr <lsr-bounces@ietf.org> on behalf of Yaron Sheffer <ya=
ronf.ietf@gmail.com>
            Sent: 10 August 2021 14:57

            So let me suggest:

            <tp>
            An offlist suggestion for you to consider

            OLD
                Thus before advertisement of the PCE security parameters, i=
t MUST be insured that the IGP protects the authentication and integrity of =
the PCED TLV using the mechanisms defined in
                [RFC5310] and [RFC5709], if the mechanism described in this=
 document is used.

                Moreover, as stated in [RFC5088] and [RFC5089], the IGP do =
not provide any encryption mechanisms to protect the secrecy of the PCED TLV=
, and the operator must ensure that no private data is carried in the TLV, f=
or example that key names do not reveal sensitive information about the netw=
ork.

            NEW

             Thus before advertising the PCE security parameters, using the=
 mechanism described in this document, the IGP MUST be known to provide auth=
entication and integrity for the PCED TLV using the mechanisms defined in  [=
RFC5304],  [RFC5310] or [RFC5709],

                Moreover, as stated in [RFC5088] and [RFC5089], if the IGP =
does not provide any encryption mechanisms to protect the secrecy of the PCE=
D TLV, then the operator must ensure that no private data is carried in the =
TLV, e.g. that key names do not reveal sensitive information about the netwo=
rk.

            Tom Petch
            </tp>

            Thanks,
                    Yaron

            On 8/10/21, 15:01, "Qin Wu" <bill.wu@huawei.com> wrote:

                Yaron:
                Thank for clarification. I agree to keep the last sentence =
in the second paragraph of section 7 as is.
                But I prefer to add the addition references in the previous=
 sentence as follows:
                "
                Thus before advertisement of the PCE security parameters, i=
t MUST be insured that the IGP is
                protected for authentication and integrity of the PCED TLV,=
, with the mechanisms defined in
                [RFC5310] and [RFC5709] if the mechanism described in this =
document is used.

                As stated in [RFC5088] and [RFC5089], the IGP do not provid=
e encryption mechanism to protect
                the privacy of the PCED TLV, if this information can make t=
he PCEP session less secure then the operator should take that into consider=
ation.
                "
                If you better wording, please let me know.

                -Qin
                -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
                =E5=8F=91=E4=BB=B6=E4=BA=BA: Yaron Sheffer [mailto:yaronf.ietf@gmail.com]
                =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2021=E5=B9=B48=E6=9C=8810=E6=97=A5 19:26
                =E6=94=B6=E4=BB=B6=E4=BA=BA: Qin Wu <bill.wu@huawei.com>; secdir@ietf.org
                =E6=8A=84=E9=80=81: draft-ietf-lsr-pce-discovery-security-support.all@i=
etf.org; last-call@ietf.org; lsr@ietf.org
                =E4=B8=BB=E9=A2=98: Re: Secdir last call review of draft-ietf-lsr-pce-d=
iscovery-security-support-05

                Hi Qin,

                Sorry, but I find your latest proposed text very confusing,=
 because we should be focusing on integrity protection and not privacy (=3Dsec=
recy) of the TLV. So I would prefer to keep the text as-is, with the additio=
n of a reference to the IS-IS and OSPF security mechanisms that were discuss=
ed on this thread.

                Thanks,
                    Yaron

                On 8/10/21, 05:00, "Qin Wu" <bill.wu@huawei.com> wrote:

                    Hi, Yaron
                    -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
                    >=E5=8F=91=E4=BB=B6=E4=BA=BA: Yaron Sheffer [mailto:yaronf.ietf@gmail.com=
]
                    >=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2021=E5=B9=B48=E6=9C=889=E6=97=A5 21:44
                    >=E6=94=B6=E4=BB=B6=E4=BA=BA: Qin Wu <bill.wu@huawei.com>; secdir@ietf.or=
g
                    >=E6=8A=84=E9=80=81: draft-ietf-lsr-pce-discovery-security-support.=
all@ietf.org; last-call@ietf.org; lsr@ietf.org
                    >=E4=B8=BB=E9=A2=98: Re: Secdir last call review of draft-ietf-lsr-=
pce-discovery-security-support-05

                    >Hi Qin,

                    >Thank you for your response.

                    >* RFC 3567 (for IS-IS) is obsoleted by RFC 5304. Unfor=
tunately RFC 5304 still uses HMAC-MD5, which would be considered insecure no=
wadays.
                    >* RFC 2154 is very old and Experimental (and only supp=
orts RSA-MD5 signatures). I'm not an OSPF expert by any means, but I'm willi=
ng to bet that there are no production implementations of this RFC. (I'm wil=
ling to be proven wrong).
                    >Is there another RFC that define a protection mechanis=
m for OSPF?

                    >All in all, there appear to be no good options for the=
 IGP.

                    [Qin Wu]Yes, we do have alternatives, see Les's respons=
e in the separate email
                    "
                    On 8/9/21, 23:36,"Les Ginsberg (ginsberg)" <ginsberg@ci=
sco.com> wrote:
                    For IS-IS security please also see RFC 5310.
                    For OSPF security please see RFC 5709.
                    "
                    >To your last point, when I mentioned decoupling the me=
chanisms, I was suggesting to use the extension you define even if the IGP *=
cannot* be secured. If you think this is reasonable, please add such text to=
 the Security Considerations.

                    [Qin Wu] Okay, how about the following change
                    OLD TEXT:
                    "
                    As stated in [RFC5088]
                    and [RFC5089], the IGP do not provide encryption mechan=
ism to protect
                    the privacy of the PCED TLV, if this information can ma=
ke the PCEP
                    session less secure then the operator should take that =
into consideration .
                    "
                    NEW TEXT:
                    "
                    As stated in [RFC5088]
                    and [RFC5089], the IGP do not provide encryption mechan=
ism to protect
                    the privacy of the PCED TLV, if this information can ma=
ke the PCEP
                    session less secure then the operator should take that =
into consideration
                    when getting the mechanism described in this document d=
eployed.
                    "
                     >Thanks,
                     >      Yaron

                    >On 8/9/21, 16:09, "Qin Wu" <bill.wu@huawei.com> wrote:

                      >   Thanks Yaron for valuable comments, please see my=
 reply inline below.
                        -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
                        >=E5=8F=91=E4=BB=B6=E4=BA=BA: Yaron Sheffer via Datatracker [mailto:n=
oreply@ietf.org]
                        >=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2021=E5=B9=B48=E6=9C=886=E6=97=A5 3:25
                        >=E6=94=B6=E4=BB=B6=E4=BA=BA: secdir@ietf.org
                        >=E6=8A=84=E9=80=81: draft-ietf-lsr-pce-discovery-security-supp=
ort.all@ietf.org; last-call@ietf.org; lsr@ietf.org
                        >=E4=B8=BB=E9=A2=98: Secdir last call review of draft-ietf-lsr-=
pce-discovery-security-support-05

                        >Reviewer: Yaron Sheffer
                        >Review result: Not Ready

                        >This document defines a mechanism (a TLV) to adver=
tise the PCE Protocol security required (use of TCP-AO and its key ID, or al=
ternatively use of TLS) within the routing protocol being used.

                        >* Sec. 3.1: I don't understand why "SHOULD adverti=
se" and not MUST. Especially given the strict client behavior defined later.
                        [Qin]: I believe "SHOULD advertise" is consistent w=
ith client behavior defined later, i.e., we apply SHOULD NOT language to the=
 client behavior.
                        I am not sure we should change it into strong langu=
age with MUST. Since if IGP advertisement doesn't include TCP-AO
                         support flag bit or TLS support flag bit, NMS may =
fall back to configure both PCC and PCE server to support TCP-AO or TLS. Tha=
t's one of reason I think why we choose to use SHOULD language.

                        >* Sec. 3.1: should we also say something about the=
 case where both methods are advertised, and whether we recommend for the cl=
ient to use one of them over the other?

                        [Qin]: It is up to local policy, which has bee clar=
ified in the end of section 3.1. Hope this clarify.

                        >* Sec. 4: typo (appears twice) - "to be carried in=
 the PCED TLV of the for use".

                        [Qin]:Thanks, have fixed them in the local copy.

                        >* Sec. 7: this phrase appears to be essential to s=
ecurity of this mechanism: "it MUST be insured that the IGP is protected for=
 authentication and integrity of the PCED TLV". I would expect more guidance=
: how can this property be ensured in the relevant IGPs?
                        [Qin]:I think mechanism defined in [RFC3567] and [R=
FC2154] can be used to ensure authenticity and integrity of OSPF LSAs or ISI=
S LSPs and their TLVs. Here is the proposed changes:
                        OLD TEXT:
                        "
                           Thus before advertisement of
                           the PCE security parameters, it MUST be insured =
that the IGP is
                           protected for authentication and integrity of th=
e PCED TLV if the
                           mechanism described in this document is used.
                        "
                        NEW TEXT:
                        "
                           Thus before advertisement of
                           the PCE security parameters, it MUST be insured =
that the IGP is
                           protected for authentication and integrity of th=
e PCED TLV with mechanisms defined in [RFC3567][RFC2154] if the
                           mechanism described in this document is used.
                        "
                        >* Also, a possibly unintended consequence of this =
requirement is that if the IGP cannot be protected in a particular deploymen=
t/product, this mechanism would not be used. Please consider if this is like=
ly to happen and whether we want to forego PCEP transport >security in such =
cases. My gut feel (not based on experience in such networks) is that the th=
reat models are different enough that we should decouple the security of IGP=
 from that of PCEP.

                        [Qin] I agree IGP security should be separated from=
 PCEP security. IGP extension defined in this document is used by the PCC to=
 select PCE server with appropriate security mechanism. On the other hand, O=
perator can either use IGP advertisement for PCEP security capability or rel=
y on local policy to select PCE. If operator feels IGP advertisement is not =
secure, he can fall back to local policy or rely on manual configuration. Ho=
pe this clarifies.







            _______________________________________________
            Lsr mailing list
            Lsr@ietf.org
            https://www.ietf.org/mailman/listinfo/lsr





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From: Qin Wu <bill.wu@huawei.com>
To: Yaron Sheffer <yaronf.ietf@gmail.com>, "Acee Lindem (acee)" <acee@cisco.com>, tom petch <ietfc@btconnect.com>, "secdir@ietf.org" <secdir@ietf.org>
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Thread-Topic: Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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To: Tero Kivinen <kivinen@iki.fi>, secdir@ietf.org
Cc: draft-ietf-roll-aodv-rpl.all@ietf.org, last-call@ietf.org, roll@ietf.org
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From: Charlie Perkins <charles.perkins@earthlink.net>
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Subject: Re: [secdir] Secdir last call review of draft-ietf-roll-aodv-rpl-09
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Hello Tero,

Thanks for your comments, useful as always.  Please excuse the unusually 
long
delay it has taken for us to respond to your comments.  Please see a bit of
follow-up below.


On 3/22/2021 9:41 AM, Tero Kivinen via Datatracker wrote:
 > The title of the draft has some acronyms which are not expanded 
(AODV, P2P)
 > and if you expand them the title comes way too long. I would propose 
a usable
 > title, which might not need to use all possible acronyms, but would 
better
 > explain what this document is trying to do.

How about "Supporting Asymmetric Links in Low Power Networks"? Replacing 
"LLNs" by "Low Power Networks" is probably O.K. because lossy is almost 
implicit given low power (or, often, reality).

 > Nits:
 >
 > In section 1 the text "RPL [RFC6550] (Routing Protocol for Low-Power 
and Lossy
 > Networks)" defines acronyms differently than what is used everywhere 
else. In
 > all other cases the document uses format where the acronym is in 
parenthesis
 > after the full text, i.e. "Routing Protocol for Low-Power and Lossy 
Networks
 > (RPL) [RFC6550]" format. I would propose using the same format also 
for here.

Done.

 >
 > In section 1 there is acronym DAG which is not expanded, expand it on 
first
 > use.

I think that sentence reads better just omitting DAG.


 > Also there are unexpanded acronyms DAO, P2MP, which are not used anywhere
 > else, perhaps just expand them here. In same paragraph there is also 
acronym
 > MOP which is not expanded here on its first use, but it is expanded 
later.
 > Expand it here on its first use.

Done, except that I thought it would be better to exhibit the acronym 
DAO since it is well known to readers familiar with RPL.


 >
 > What is the difference between different reserve bits X and r in sections
 > 4.1/4.2 and 4.3?
I made them all to be reserved bits 'X'.

 >
 > Period missing from the end of sentence of the Option Length 
description in
 > Section 4.3.

Done.

 >
 > In the IANA considerations section I propose add a note to RFC editor 
saying
 > that the sentences saying " The parenthesized numbers are only 
suggestions."
 > needs to be removed prior publication.
 >
 >

Done!

Naturally Yours,
Charlie P.



On 3/22/2021 9:41 AM, Tero Kivinen via Datatracker wrote:
> Reviewer: Tero Kivinen
> Review result: Has Nits
>
> I have reviewed this document as part of the security directorate's ongoing
> effort to review all IETF documents being processed by the IESG.  These
> comments were written primarily for the benefit of the security area directors.
>   Document editors and WG chairs should treat these comments just like any other
> last call comments.
>
> The title of the draft has some acronyms which are not expanded (AODV, P2P) and
> if you expand them the title comes way too long. I would propose a usable
> title, which might not need to use all possible acronyms, but would better
> explain what this document is trying to do.
>
> This draft defines a new mode of operation to the allow peer to peer on demand
> routing in low power and lossy networks. I have not enough knowledge of RPL to
> really know how the new mode differs from the old methods. The security
> considerations section points to the RFC6550, and then explains that if rogue
> router has key it can do all kind of things.
>
> Nits:
>
> In section 1 the text "RPL [RFC6550] (Routing Protocol for Low-Power and Lossy
> Networks)" defines acronyms differently than what is used everywhere else. In
> all other cases the document uses format where the acronym is in parenthesis
> after the full text, i.e. "Routing Protocol for Low-Power and Lossy Networks
> (RPL) [RFC6550]" format. I would propose using the same format also for here.
>
> In section 1 there is acronym DAG which is not expanded, expand it on first
> use. Also there are unexpanded acronyms DAO, P2MP, which are not used anywhere
> else, perhaps just expand them here. In same paragraph there is also acronym
> MOP which is not expanded here on its first use, but it is expanded later.
> Expand it here on its first use.
>
> What is the difference between different reserve bits X and r in sections
> 4.1/4.2 and 4.3?
>
> Period missing from the end of sentence of the Option Length description in
> Section 4.3.
>
> In the IANA considerations section I propose add a note to RFC editor saying
> that the sentences saying " The parenthesized numbers are only suggestions."
> needs to be removed prior publication.
>
>


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To: Yaron Sheffer <yaronf.ietf@gmail.com>, Qin Wu <bill.wu@huawei.com>, "tom petch" <ietfc@btconnect.com>, "secdir@ietf.org" <secdir@ietf.org>
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Subject: Re: [secdir] Secdir last call review of draft-ietf-lsr-pce-discovery-security-support-05
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Date: Thu, 19 Aug 2021 21:31:28 +0300
From: Tero Kivinen <kivinen@iki.fi>
To: Charlie Perkins <charles.perkins@earthlink.net>
Cc: secdir@ietf.org, draft-ietf-roll-aodv-rpl.all@ietf.org, last-call@ietf.org, roll@ietf.org
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdir/1myt9DFsywc0yKu_UGGM21upIes>
Subject: Re: [secdir] Secdir last call review of draft-ietf-roll-aodv-rpl-09
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Charlie Perkins writes:
> Hello Tero,
>=20
> Thanks for your comments, useful as always.=A0 Please excuse the unus=
ually=20
> long
> delay it has taken for us to respond to your comments.=A0 Please see =
a bit of
> follow-up below.

Changes look good.=20

> On 3/22/2021 9:41 AM, Tero Kivinen via Datatracker wrote:
>  > The title of the draft has some acronyms which are not expanded=20=

> (AODV, P2P)
>  > and if you expand them the title comes way too long. I would propo=
se=20
> a usable
>  > title, which might not need to use all possible acronyms, but woul=
d=20
> better
>  > explain what this document is trying to do.
>=20
> How about "Supporting Asymmetric Links in Low Power Networks"=3F Repl=
acing=20
> "LLNs" by "Low Power Networks" is probably O.K. because lossy is almo=
st=20
> implicit given low power (or, often, reality).

I think that title is good.=20
--=20
kivinen@iki.fi


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Review instructions and related resources are at:
https://trac.ietf.org/trac/sec/wiki/SecDirReview

For telechat 2021-08-26

Reviewer               LC end     Draft
Joseph Salowey        R2021-07-23 draft-ietf-httpbis-bcp56bis
Stefan Santesson       2021-08-11 draft-ietf-bier-te-arch

Last calls:

Reviewer               LC end     Draft
Steve Hanna            2021-03-22 draft-ietf-regext-secure-authinfo-transfer
Catherine Meadows      2021-04-14 draft-ietf-ntp-interleaved-modes
Sandra Murphy          2020-10-15 draft-ietf-tls-external-psk-importer
Tim Polk               2021-08-06 draft-ietf-opsawg-vpn-common
Joseph Salowey        R2021-07-23 draft-ietf-httpbis-bcp56bis
Stefan Santesson       2021-08-11 draft-ietf-bier-te-arch
Valery Smyslov         None       draft-ietf-netconf-crypto-types
Mališa Vučinić         2021-06-10 draft-ietf-httpbis-semantics
Samuel Weiler          2021-08-25 draft-ietf-alto-path-vector
Brian Weis             2021-08-19 draft-ietf-dnsop-svcb-https
Klaas Wierenga         2021-08-30 draft-ietf-alto-cdni-request-routing-alto
Klaas Wierenga         2020-12-02 draft-ietf-core-echo-request-tag
Klaas Wierenga         2020-05-26 draft-ietf-kitten-krb-spake-preauth
Paul Wouters           2021-08-26 draft-ietf-alto-unified-props-new
Paul Wouters           2021-06-10 draft-ietf-httpbis-messaging
Liang Xia              2021-03-17 draft-ietf-core-sid

Early review requests:

Reviewer               Due        Draft
Stephen Farrell        2021-06-21 draft-ietf-idr-bgpls-srv6-ext
Tina Tsou              2021-08-25 draft-ietf-opsawg-sbom-access
Sean Turner            2021-08-18 draft-ietf-taps-interface
Loganaden Velvindron   2021-08-18 draft-ietf-taps-arch

Next in the reviewer rotation:

  Christopher Wood
  Paul Wouters
  Liang Xia
  Dacheng Zhang
  Derek Atkins
  John Bradley
  Nancy Cam-Winget
  Shaun Cooley
  Alan DeKok
  Linda Dunbar


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Subject: [secdir] [new-work] IEEE 802 July 2021 Plenary - New Study Groups
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Dear Members of the IETF:

In the spirit of continuing cooperation between IEEE 802 and IETF, the
following letter addresses new work items for information and potential
coordination with the respective IEEE 802 WG.   

 

One of the first steps in the IEEE Standards Association's standards
development process is the creation of a Study Group. Study groups are
chartered to create a formal Project Authorization Request (PAR) document
that includes a description of the project's scope and purpose.  

 

The following Study Groups were approved at the July 2021 IEEE 802 Plenary -

*	IEEE 802.3 Greater than 10 Mb/s long-reach point-to-point single
pair Ethernet PHY 
*	IEEE 802.15 SG15.3ma:maintenance revision Study Group

Further information about Study Groups may be found at
http://www.ieee802.org/StudyGroups.shtml.      

 

Please note, per the IEEE 802 Policies and Procedures that a Study Group is
chartered to operate until the next plenary session, a period of four months
and, if it wishes to continue, must request a charter extension. Study
Groups may also terminate between plenary sessions if their proposed project
is approved by the IEEE Standards Association Standards Board.  

 

Additionally, within the IEEE 802 family of standards, there is a
requirement that each new project proposal attaches additional documentation
that describes its engineering feasibility, market potential, assurance of
coexistence and distinct identity relative to previous standards (referred
to as the "CSD" in 802, which also includes the "5 criteria").  The
"Criteria for Standards Development (CSD)" used by IEEE 802 can be found in
document:  

 

https://mentor.ieee.org/802-ec/dcn/14/ec-14-0028-00-00EC-csd-informative-ext
ract.pdf   

 

Also please note that IEEE meetings are open and may be attended by any
individuals who register and fulfill any registration fees. Details
regarding future IEEE 802 plenary meeting schedules may be found at
http://802world.org/plenary/future-plenary-sessions/.  Please refer to
individual working groups for their interim meeting schedules. A listing of
all working groups may be found at http://www.ieee802.org/.     

 

Sincerely,   

 

John D'Ambrosia  

Recording Secretary, IEEE 802 LMSC  

jdambrosia@ieee.org <mailto:jdambrosia@ieee.org>     

 


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link=3D"#0563C1" vlink=3D"#954F72" style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'>Dear Members of the =
IETF:<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'>In the spirit of continuing cooperation =
between IEEE 802 and IETF, the following letter addresses new work items =
for information and potential coordination with the respective IEEE 802 =
WG.&nbsp;&nbsp; <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt'>One of the first =
steps in the IEEE Standards Association&#8217;s standards development =
process is the creation of a Study Group. Study groups are chartered to =
create a formal Project Authorization Request (PAR) document that =
includes a description of the project&#8217;s scope and purpose.&nbsp; =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt'>The following Study =
Groups were approved at the July 2021 IEEE 802 Plenary =
&#8211;<o:p></o:p></span></p><ul type=3Ddisc><li =
class=3DMsoListParagraph =
style=3D'color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;m=
argin-left:0in;mso-list:l1 level1 lfo2'><span =
style=3D'font-size:10.0pt'>IEEE 802.3 Greater than 10 Mb/s long-reach =
point-to-point single pair Ethernet PHY <o:p></o:p></span></li><li =
class=3DMsoListParagraph =
style=3D'color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;m=
argin-left:0in;mso-list:l1 level1 lfo2'><span =
style=3D'font-size:10.0pt'>IEEE 802.15 SG15.3ma:maintenance revision =
Study Group<o:p></o:p></span></li></ul><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'>Further information about Study Groups may be =
found at <a =
href=3D"http://www.ieee802.org/StudyGroups.shtml">http://www.ieee802.org/=
StudyGroups.shtml</a>. =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt'>Please note, per the =
IEEE 802 Policies and Procedures that a Study Group is chartered to =
operate until the next plenary session, a period of four months and, if =
it wishes to continue, must request a charter extension. Study Groups =
may also terminate between plenary sessions if their proposed project is =
approved by the IEEE Standards Association Standards Board.&nbsp; =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt'>Additionally, within =
the IEEE 802 family of standards, there is a requirement that each new =
project proposal attaches additional documentation that describes its =
engineering feasibility, market potential, assurance of coexistence and =
distinct identity relative to previous standards (referred to as the =
&#8220;CSD&#8221; in 802, which also includes the &#8220;5 =
criteria&#8221;). &nbsp;The &#8220;Criteria for Standards Development =
(CSD)&#8221; used by IEEE 802 can be found in document:&nbsp; =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt'><a =
href=3D"https://mentor.ieee.org/802-ec/dcn/14/ec-14-0028-00-00EC-csd-info=
rmative-extract.pdf">https://mentor.ieee.org/802-ec/dcn/14/ec-14-0028-00-=
00EC-csd-informative-extract.pdf</a> =
&nbsp;&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt'>Also please note that =
IEEE meetings are open and may be attended by any individuals who =
register and fulfill any registration fees. Details regarding future =
IEEE 802 plenary meeting schedules may be found at <a =
href=3D"http://802world.org/plenary/future-plenary-sessions/">http://802w=
orld.org/plenary/future-plenary-sessions/</a>. &nbsp;Please refer to =
individual working groups for their interim meeting schedules. A listing =
of all working groups may be found at <a =
href=3D"http://www.ieee802.org/">http://www.ieee802.org/</a>. =
&nbsp;&nbsp;&nbsp;&nbsp;<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt'>Sincerely,&nbsp;&nbsp; =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:10.0pt'>John =
D&#8217;Ambrosia&nbsp; <o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'>Recording Secretary, IEEE 802 LMSC&nbsp; =
<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt'><a =
href=3D"mailto:jdambrosia@ieee.org">jdambrosia@ieee.org</a> =
&nbsp;&nbsp;&nbsp;<o:p></o:p></span></p><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div></body></html>
------=_NextPart_000_0ADF_01D79835.9B979450--


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From nobody Tue Aug 24 11:29:54 2021
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Subject: [secdir] Secdir last call review of draft-ietf-netconf-crypto-types-20
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Reviewer: Valery Smyslov
Review result: Has Issues

I have reviewed this document as part of the security directorate's ongoing
effort to review all IETF documents being processed by the IESG.  These
comments were written primarily for the benefit of the security area directors.
 Document editors and WG chairs should treat these comments just like any other
last call comments.

When I was re-assigned to review this draft the indicated deadline was already
missed by 8 months, so I don't know how relevant the review is. I reviewed
the latest -20 version of the draft instead of -18, that was requested.

The draft defines common YANG data types and groupings useful for cryptography.
I din't try to check the YANG module itself. 

Issues:

Shouldn't a Privacy Considerations section be added to the draft?
The draft defines quite a lot of privacy-sensitive information (like certificates)
with no restriction on read access (as far as I understand).

Section 3.5.
While I understand and support the idea, expressed in this section, I think that
the way it is expressed makes it difficult to follow in practice. In general, it's
not always obvious how to estimate the "strength" of the underlying secure transport.
For this reason it's not clear for me how it is supposed to "compare" the 
"strength" of the transport with the "strength" of the keys being transported.

In addition, the requirement, that "Implementations SHOULD fail the write-request if ever
the strength of the private key is greater then the strength of the
underlying transport" looks wrong to me. You don't need to have
1024 bits transport protocol strength to transfer 1024 bit key, since
even for say 256 bits it's infeasible to break.

I think that the better approach would be to advise using strong
ciphersuites for transport protocols defined in corresponding RFCs.
For example, for TLS 1.3 there are ciphersuites marked as "recommended",
that were evaluated by IETF crypto community.

Section 3.6:
   For instance, AES
   using "EBC" SHOULD NOT be used to encrypt passwords, whereas "CBC"
   mode is okay since it a unique initialization vector (IV) should be
   used for each run.

Not only IV for CBC should be unique, it should be unpredictable (random or pseudo-random).
I also think that lowercase "should" here must be uppercase, or even MUST.

Typos, nits:

Section 3.6: 
   In order to thwart rainbow attacks, algorithms that result in a
   unique output for the same input SHOULD be used. 

s/SHOULD/SHOULD NOT

   For instance, AES
   using "EBC" SHOULD NOT be used to encrypt passwords, whereas "CBC"
   mode is okay since it a unique initialization vector (IV) should be
   used for each run.

s/EBC/ECB
s/it//
I believe "okay' is a bit of slang, isn't it?

Section 3.8:
   Since the module in this document only define groupings, these
   considerations are primarily for the designers of other modules that
   use these groupings.

s/define/defines





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From nobody Thu Aug 26 06:30:38 2021
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Review instructions and related resources are at:
https://trac.ietf.org/trac/sec/wiki/SecDirReview

For telechat 2021-08-26

Reviewer               LC end     Draft
Joseph Salowey        R2021-07-23 draft-ietf-httpbis-bcp56bis
Stefan Santesson       2021-08-11 draft-ietf-bier-te-arch

Last calls:

Reviewer               LC end     Draft
Derek Atkins           2021-09-07 draft-ietf-bess-evpn-optimized-ir
John Bradley           2021-09-06 draft-ietf-core-senml-data-ct
Shaun Cooley           2021-09-06 draft-ietf-jmap-smime
Alan DeKok             2021-09-03 draft-ietf-dnsop-dns-tcp-requirements
Steve Hanna            2021-03-22 draft-ietf-regext-secure-authinfo-transfer
Catherine Meadows      2021-04-14 draft-ietf-ntp-interleaved-modes
Sandra Murphy          2020-10-15 draft-ietf-tls-external-psk-importer
Tim Polk               2021-08-06 draft-ietf-opsawg-vpn-common
Joseph Salowey        R2021-07-23 draft-ietf-httpbis-bcp56bis
Stefan Santesson       2021-08-11 draft-ietf-bier-te-arch
Mališa Vučinić         2021-09-06 draft-ietf-httpbis-semantics
Samuel Weiler          2021-08-25 draft-ietf-alto-path-vector
Brian Weis             2021-08-19 draft-ietf-dnsop-svcb-https
Klaas Wierenga         2021-08-30 draft-ietf-alto-cdni-request-routing-alto
Klaas Wierenga         2020-12-02 draft-ietf-core-echo-request-tag
Klaas Wierenga         2020-05-26 draft-ietf-kitten-krb-spake-preauth
Paul Wouters           2021-08-26 draft-ietf-alto-unified-props-new
Paul Wouters           2021-09-06 draft-ietf-httpbis-messaging
Liang Xia              2021-09-07 draft-ietf-bess-evpn-igmp-mld-proxy
Liang Xia              2021-03-17 draft-ietf-core-sid
Dacheng Zhang          2021-09-07 draft-ietf-bess-evpn-bum-procedure-updates

Early review requests:

Reviewer               Due        Draft
Stephen Farrell        2021-06-21 draft-ietf-idr-bgpls-srv6-ext
Tina Tsou              2021-08-25 draft-ietf-opsawg-sbom-access
Sean Turner            2021-08-18 draft-ietf-taps-interface
Loganaden Velvindron   2021-08-18 draft-ietf-taps-arch

Next in the reviewer rotation:

  Christopher Wood
  Paul Wouters
  Liang Xia
  Dacheng Zhang
  Derek Atkins
  John Bradley
  Nancy Cam-Winget
  Shaun Cooley
  Alan DeKok
  Linda Dunbar


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Reviewer: Joseph Salowey
Review result: Ready

The revision addressed my comments.  



From nobody Fri Aug 27 07:53:33 2021
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From: Kent Watsen <kent+ietf@watsen.net>
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Subject: Re: [secdir] [Last-Call] Secdir last call review of draft-ietf-netconf-crypto-types-20
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[removing =E2=80=9Clast-call=E2=80=9D alias]


Hello Valery. =20

Thank you for your SecDir review, it is very much appreciated and never =
too late!

More comments below.

Thanks,
Kent


> On Aug 24, 2021, at 2:29 PM, Valery Smyslov via Datatracker =
<noreply@ietf.org> wrote:
>=20
> Reviewer: Valery Smyslov
> Review result: Has Issues
>=20
> I have reviewed this document as part of the security directorate's =
ongoing
> effort to review all IETF documents being processed by the IESG.  =
These
> comments were written primarily for the benefit of the security area =
directors.
> Document editors and WG chairs should treat these comments just like =
any other
> last call comments.
>=20
> When I was re-assigned to review this draft the indicated deadline was =
already
> missed by 8 months, so I don't know how relevant the review is. I =
reviewed
> the latest -20 version of the draft instead of -18, that was =
requested.

Perfect.


> The draft defines common YANG data types and groupings useful for =
cryptography.
> I din't try to check the YANG module itself.=20
>=20
> Issues:
>=20
> Shouldn't a Privacy Considerations section be added to the draft?
> The draft defines quite a lot of privacy-sensitive information (like =
certificates)
> with no restriction on read access (as far as I understand).


Both the "trust-anchor-cert-grouping=E2=80=9D and =
=E2=80=9Cend-entity-cert-grouping=E2=80=9D groupings have =
"nacm:default-deny-write=E2=80=9D that, to your point, does not restrict =
reads.  That said, only management protocols having mutual =
authentication (e.g., SSH and/or TLS based transport) can access the =
data. =20

Is your concern that the certificate=E2=80=99s content would be visible =
to the administrators?  Is your comment on end-entity certificates =
(containing personally-identifying information), more than =
trust-anchor-certificates?


> Section 3.5.
> While I understand and support the idea, expressed in this section, I =
think that
> the way it is expressed makes it difficult to follow in practice. In =
general, it's
> not always obvious how to estimate the "strength" of the underlying =
secure transport.
> For this reason it's not clear for me how it is supposed to "compare" =
the=20
> "strength" of the transport with the "strength" of the keys being =
transported.

I saw language like this once in a DoD setting.  I agree that it is =
difficult to implement in practice.  I used =E2=80=9CSHOULD=E2=80=9D =
(not MUST) to buy some leeway for implementations to be compliant.  =
Makes sense?

FWIW, my YANG-driven server is able to remember what key the client used =
for authentication (e.g., RSA 2048) and register a callback to test that =
no greater keys (e.g., 3072 or 4096) are configured by that client.  =
Additional logic would be needed to prevent a low-strength client from =
*reading* a high-strength key configured by another client=E2=80=A6though =
the issue can be alternatively resolved by configuring the TLS-stack to =
prevent low-strength algorithms.


> In addition, the requirement, that "Implementations SHOULD fail the =
write-request if ever
> the strength of the private key is greater then the strength of the
> underlying transport" looks wrong to me. You don't need to have
> 1024 bits transport protocol strength to transfer 1024 bit key, since
> even for say 256 bits it's infeasible to break.

IDK about this.  Again, I saw this constraint once in a DoD setting. =20


> I think that the better approach would be to advise using strong
> ciphersuites for transport protocols defined in corresponding RFCs.
> For example, for TLS 1.3 there are ciphersuites marked as =
"recommended",
> that were evaluated by IETF crypto community.

I added this sentence:

	Implementations SHOULD configure allowed transport=20
	algorithms to include only those meeting local
	policy (e.g., listed as "recommended" by the IETF).

Good?


> Section 3.6:
>   For instance, AES
>   using "EBC" SHOULD NOT be used to encrypt passwords, whereas "CBC"
>   mode is okay since it a unique initialization vector (IV) should be
>   used for each run.
>=20
> Not only IV for CBC should be unique, it should be unpredictable =
(random or pseudo-random).
> I also think that lowercase "should" here must be uppercase, or even =
MUST.

Replaced =E2=80=9Cunique=E2=80=9D with =E2=80=9Cunpredictable=E2=80=9D
Replaced =E2=80=9Cshould=E2=80=9D with MUST.


> Typos, nits:
>=20
> Section 3.6:=20
>   In order to thwart rainbow attacks, algorithms that result in a
>   unique output for the same input SHOULD be used.=20
>=20
> s/SHOULD/SHOULD NOT

Egads - fixed!


>   For instance, AES
>   using "EBC" SHOULD NOT be used to encrypt passwords, whereas "CBC"
>   mode is okay since it a unique initialization vector (IV) should be
>   used for each run.
>=20
> s/EBC/ECB
> s/it//
> I believe "okay' is a bit of slang, isn't it?

Fixed, now reads:

	In order to thwart rainbow attacks, algorithms that result
	in a unique output for the same input SHOULD NOT be used.
	For instance, AES using "ECB" SHOULD NOT be used to
	encrypt passwords, whereas "CBC" mode is permissible
	since an unpredictable initialization vector (IV) MUST be
	used for each use.</t>


> Section 3.8:
>   Since the module in this document only define groupings, these
>   considerations are primarily for the designers of other modules that
>   use these groupings.
>=20
> s/define/defines

Fixed!



Kent, as author



--Apple-Mail=_17EAF07D-2366-4962-B625-7E97D33BF5B2
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	charset=utf-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><div =
class=3D"">[removing =E2=80=9Clast-call=E2=80=9D alias]</div><div =
class=3D""><br class=3D""></div><div class=3D""><br class=3D""></div>Hello=
 Valery. &nbsp;<div class=3D""><br class=3D""></div><div class=3D"">Thank =
you for your SecDir review, it is very much appreciated and never too =
late!<div><br class=3D""></div><div>More comments below.</div><div><br =
class=3D""></div><div>Thanks,</div><div>Kent</div><div><br =
class=3D""></div><div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D"">On Aug 24, 2021, at 2:29 PM, Valery Smyslov =
via Datatracker &lt;<a href=3D"mailto:noreply@ietf.org" =
class=3D"">noreply@ietf.org</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"">Reviewer: Valery Smyslov<br class=3D"">Review result: Has =
Issues<br class=3D""><br class=3D"">I have reviewed this document as =
part of the security directorate's ongoing<br class=3D"">effort to =
review all IETF documents being processed by the IESG. &nbsp;These<br =
class=3D"">comments were written primarily for the benefit of the =
security area directors.<br class=3D""> Document editors and WG chairs =
should treat these comments just like any other<br class=3D"">last call =
comments.<br class=3D""><br class=3D"">When I was re-assigned to review =
this draft the indicated deadline was already<br class=3D"">missed by 8 =
months, so I don't know how relevant the review is. I reviewed<br =
class=3D"">the latest -20 version of the draft instead of -18, that was =
requested.<br class=3D""></div></div></blockquote><div><br =
class=3D""></div>Perfect.</div><div><br class=3D""></div><div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D"">The draft defines common YANG data types and groupings useful =
for cryptography.<br class=3D"">I din't try to check the YANG module =
itself. <br class=3D""><br class=3D"">Issues:<br class=3D""><br =
class=3D"">Shouldn't a Privacy Considerations section be added to the =
draft?<br class=3D"">The draft defines quite a lot of privacy-sensitive =
information (like certificates)<br class=3D"">with no restriction on =
read access (as far as I understand).<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div><br =
class=3D""></div><div>Both the "trust-anchor-cert-grouping=E2=80=9D and =
=E2=80=9Cend-entity-cert-grouping=E2=80=9D groupings have&nbsp;<font =
color=3D"#000000" class=3D"">"nacm:default-deny-write=E2=80=9D that, to =
your point, does not restrict reads. &nbsp;That said, =
only&nbsp;management protocols having mutual authentication (e.g., SSH =
and/or TLS based transport) can access the data. =
&nbsp;</font></div><div><font color=3D"#000000" class=3D""><br =
class=3D""></font></div><div><font color=3D"#000000" class=3D"">Is your =
concern that the certificate=E2=80=99s content would be visible to the =
administrators</font><span style=3D"color: rgb(0, 0, 0);" class=3D"">? =
&nbsp;Is your comment on end-entity certificates (containing =
personally-identifying information), more than =
trust-anchor-certificates?</span></div><div><br class=3D""></div><div><br =
class=3D""></div></div><div><blockquote type=3D"cite" class=3D""><div =
class=3D""><div class=3D"">Section 3.5.<br class=3D"">While I understand =
and support the idea, expressed in this section, I think that<br =
class=3D"">the way it is expressed makes it difficult to follow in =
practice. In general, it's<br class=3D"">not always obvious how to =
estimate the "strength" of the underlying secure transport.<br =
class=3D"">For this reason it's not clear for me how it is supposed to =
"compare" the <br class=3D"">"strength" of the transport with the =
"strength" of the keys being transported.<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>I saw =
language like this once in a DoD setting. &nbsp;I agree that it is =
difficult to implement in practice. &nbsp;I used =E2=80=9CSHOULD=E2=80=9D =
(not MUST) to buy some leeway for implementations to be compliant. =
&nbsp;Makes sense?</div><div><br class=3D""></div><div>FWIW, my =
YANG-driven server is able to remember what key the client used for =
authentication (e.g., RSA 2048) and register a callback to test that no =
greater keys (e.g., 3072 or 4096) are configured by that client. =
&nbsp;Additional logic would be needed to prevent a low-strength client =
from *reading* a high-strength key configured by another client=E2=80=A6th=
ough the issue can be alternatively resolved by configuring the =
TLS-stack to prevent low-strength algorithms.</div><div><br =
class=3D""></div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><div class=3D"">In addition, the requirement, that =
"Implementations SHOULD fail the write-request if ever<br class=3D"">the =
strength of the private key is greater then the strength of the<br =
class=3D"">underlying transport" looks wrong to me. You don't need to =
have<br class=3D"">1024 bits transport protocol strength to transfer =
1024 bit key, since<br class=3D"">even for say 256 bits it's infeasible =
to break.<br class=3D""></div></div></blockquote><div><br =
class=3D""></div><div>IDK about this. &nbsp;Again, I saw this constraint =
once in a DoD setting. &nbsp;</div><div><br class=3D""></div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D"">I think that the better approach would be to advise using =
strong<br class=3D"">ciphersuites for transport protocols defined in =
corresponding RFCs.<br class=3D"">For example, for TLS 1.3 there are =
ciphersuites marked as "recommended",<br class=3D"">that were evaluated =
by IETF crypto community.<br class=3D""></div></div></blockquote><div><br =
class=3D""></div><div>I added this sentence:</div><div><br =
class=3D""></div><div><span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span>Implementations SHOULD =
configure&nbsp;<span style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, =
0, 0);" class=3D"">allowed transport&nbsp;<br class=3D""></span><span =
class=3D"Apple-tab-span" style=3D"white-space: pre;">	=
</span>algorithms to include only&nbsp;those meeting local</div><span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	</span>policy =
(e.g., listed as "recommended" by the&nbsp;IETF).<div><br =
class=3D""></div><div>Good?</div><div><br class=3D""></div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D"">Section 3.6:<br class=3D""> &nbsp;&nbsp;For instance, AES<br =
class=3D""> &nbsp;&nbsp;using "EBC" SHOULD NOT be used to encrypt =
passwords, whereas "CBC"<br class=3D""> &nbsp;&nbsp;mode is okay since =
it a unique initialization vector (IV) should be<br class=3D""> =
&nbsp;&nbsp;used for each run.<br class=3D""><br class=3D"">Not only IV =
for CBC should be unique, it should be unpredictable (random or =
pseudo-random).<br class=3D"">I also think that lowercase "should" here =
must be uppercase, or even MUST.<br =
class=3D""></div></div></blockquote><div><br =
class=3D""></div><div>Replaced =E2=80=9Cunique=E2=80=9D with =
=E2=80=9Cunpredictable=E2=80=9D</div><div>Replaced =E2=80=9Cshould=E2=80=9D=
 with MUST.</div><div><br class=3D""></div><div><br =
class=3D""></div><blockquote type=3D"cite" class=3D""><div class=3D""><div=
 class=3D"">Typos, nits:<br class=3D""><br class=3D"">Section 3.6: <br =
class=3D""> &nbsp;&nbsp;In order to thwart rainbow attacks, algorithms =
that result in a<br class=3D""> &nbsp;&nbsp;unique output for the same =
input SHOULD be used. <br class=3D""><br class=3D"">s/SHOULD/SHOULD =
NOT<br class=3D""></div></div></blockquote><div><br =
class=3D""></div><div>Egads - fixed!</div><div><br class=3D""></div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D""> &nbsp;&nbsp;For instance, AES<br class=3D""> =
&nbsp;&nbsp;using "EBC" SHOULD NOT be used to encrypt passwords, whereas =
"CBC"<br class=3D""> &nbsp;&nbsp;mode is okay since it a unique =
initialization vector (IV) should be<br class=3D""> &nbsp;&nbsp;used for =
each run.<br class=3D""><br class=3D"">s/EBC/ECB<br class=3D"">s/it//<br =
class=3D"">I believe "okay' is a bit of slang, isn't it?<br =
class=3D""></div></div></blockquote><div><br class=3D""></div><div>Fixed, =
now reads:</div><div><br class=3D""></div><div><span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	</span>In order =
to thwart rainbow attacks,&nbsp;algorithms that result<br class=3D""><span=
 class=3D"Apple-tab-span" style=3D"white-space:pre">	</span>in a =
unique output for the same input SHOULD&nbsp;NOT be =
used.</div><div><span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>For&nbsp;instance, AES using "ECB" SHOULD NOT be =
used&nbsp;to</div><div><span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span>encrypt passwords,&nbsp;whereas =
"CBC" mode is permissible</div><div><span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span>since =
an&nbsp;unpredictable&nbsp;initialization vector (IV) MUST =
be</div><div><span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>used for&nbsp;each use.&lt;/t&gt;<br class=3D""><br =
class=3D""></div><div><br class=3D""></div><blockquote type=3D"cite" =
class=3D""><div class=3D""><div class=3D"">Section 3.8:<br class=3D""> =
&nbsp;&nbsp;Since the module in this document only define groupings, =
these<br class=3D""> &nbsp;&nbsp;considerations are primarily for the =
designers of other modules that<br class=3D""> &nbsp;&nbsp;use these =
groupings.<br class=3D""><br class=3D"">s/define/defines<br =
class=3D""></div></div></blockquote><div><br =
class=3D""></div>Fixed!</div><div><br class=3D""></div><div><br =
class=3D""></div><div><br class=3D""></div><div>Kent, as =
author</div><div><br class=3D""></div><br class=3D""></div></body></html>=

--Apple-Mail=_17EAF07D-2366-4962-B625-7E97D33BF5B2--


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From: "Valery Smyslov" <valery@smyslov.net>
To: "'Kent Watsen'" <kent+ietf@watsen.net>
Cc: <secdir@ietf.org>, <draft-ietf-netconf-crypto-types.all@ietf.org>, <netconf@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdir/ZOFiqNOvdB6ILLoGaBCtPOltkuw>
Subject: Re: [secdir] [Last-Call] Secdir last call review of draft-ietf-netconf-crypto-types-20
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Hi Kent,

=20

thank you for addressing my comments. A bit more inline.

=20

[removing =E2=80=9Clast-call=E2=80=9D alias]

=20

=20

Hello Valery. =20

=20

Thank you for your SecDir review, it is very much appreciated and never =
too late!

=20

More comments below.

=20

Thanks,

Kent

=20





On Aug 24, 2021, at 2:29 PM, Valery Smyslov via Datatracker =
<noreply@ietf.org> wrote:

=20

Reviewer: Valery Smyslov
Review result: Has Issues

I have reviewed this document as part of the security directorate's =
ongoing
effort to review all IETF documents being processed by the IESG.  These
comments were written primarily for the benefit of the security area =
directors.
Document editors and WG chairs should treat these comments just like any =
other
last call comments.

When I was re-assigned to review this draft the indicated deadline was =
already
missed by 8 months, so I don't know how relevant the review is. I =
reviewed
the latest -20 version of the draft instead of -18, that was requested.

=20

Perfect.

=20





The draft defines common YANG data types and groupings useful for =
cryptography.
I din't try to check the YANG module itself.=20

Issues:

Shouldn't a Privacy Considerations section be added to the draft?
The draft defines quite a lot of privacy-sensitive information (like =
certificates)
with no restriction on read access (as far as I understand).

=20

=20

Both the "trust-anchor-cert-grouping=E2=80=9D and =
=E2=80=9Cend-entity-cert-grouping=E2=80=9D groupings have =
"nacm:default-deny-write=E2=80=9D that, to your point, does not restrict =
reads.  That said, only management protocols having mutual =
authentication (e.g., SSH and/or TLS based transport) can access the =
data. =20

=20

Is your concern that the certificate=E2=80=99s content would be visible =
to the administrators?  Is your comment on end-entity certificates =
(containing personally-identifying information), more than =
trust-anchor-certificates?

=20

          Yes, it=E2=80=99s mostly on end-entity certificates, however =
there may be quite a lot of interesting

          private information besides certificates.

=20

          If this information is only visible to the administrators and =
the used management protocols must=20

          have mutual authentication, then it=E2=80=99s probably not a =
big deal. I would have still added

          a sentence about privacy of the stored data (i.e. that =
persons, that are allowed to access this data

          are able to learn quite a lot of private information from it). =
I don=E2=80=99t insist though, it=E2=80=99s up to you.

=20

Section 3.5.
While I understand and support the idea, expressed in this section, I =
think that
the way it is expressed makes it difficult to follow in practice. In =
general, it's
not always obvious how to estimate the "strength" of the underlying =
secure transport.
For this reason it's not clear for me how it is supposed to "compare" =
the=20
"strength" of the transport with the "strength" of the keys being =
transported.

=20

I saw language like this once in a DoD setting.  I agree that it is =
difficult to implement in practice.  I used =E2=80=9CSHOULD=E2=80=9D =
(not MUST) to buy some leeway for implementations to be compliant.  =
Makes sense?

=20

          My understanding of using RFC2119 language is that SHOULD is =
very close to MUST,

          but allows some exceptions. So, I still think that you put a =
responsibility to make

          security-related decisions on implementers, who often are not =
experts in this area.

=20

FWIW, my YANG-driven server is able to remember what key the client used =
for authentication (e.g., RSA 2048) and register a callback to test that =
no greater keys (e.g., 3072 or 4096) are configured by that client.  =
Additional=20

=20

          What if the other key configured for the client is X25519? =
Which is stronger?

=20

logic would be needed to prevent a low-strength client from *reading* a =
high-strength key configured by another client=E2=80=A6though the issue =
can be alternatively resolved by configuring the TLS-stack to prevent =
low-strength algorithms.

=20

          That was my point. I think that it=E2=80=99s better to require =
(by SHOULD) that only

          those ciphersuites that were =E2=80=9Cvetted=E2=80=9D by IETF =
(i.e. got =E2=80=9CRecommended=E2=80=9D status) be used.

          This will make implementers=E2=80=99 life easier.

=20

In addition, the requirement, that "Implementations SHOULD fail the =
write-request if ever
the strength of the private key is greater then the strength of the
underlying transport" looks wrong to me. You don't need to have
1024 bits transport protocol strength to transfer 1024 bit key, since
even for say 256 bits it's infeasible to break.

=20

IDK about this.  Again, I saw this constraint once in a DoD setting. =20

=20

          My (another) point was that there is generally no point to =
increase

          security strength beyond some level. Currently it is believed

          that 128 bit of symmetric key is infeasible to break (provided =
the algorithm is not broken itself),

          If you are lucky have full-sized Post Quantum computer, =
it=E2=80=99ll be 256 bits.

          It=E2=80=99s enough to transfer symmetric keys with say 1024 =
bits of entropy

          (FWIW). So the requirement that the strength of transport must

          be always greater than the strength of transported key=20

          seems not a good requirement to me. Instead require that

          the strength of transport be sufficient to make

          infeasible for an attacker to break it.

         =20

I think that the better approach would be to advise using strong
ciphersuites for transport protocols defined in corresponding RFCs.
For example, for TLS 1.3 there are ciphersuites marked as "recommended",
that were evaluated by IETF crypto community.

=20

I added this sentence:

=20

          Implementations SHOULD configure allowed transport=20
          algorithms to include only those meeting local

          policy (e.g., listed as "recommended" by the IETF).

=20

Good?

=20

          Perfect.

=20

          Regards,

          Valery.



Section 3.6:
  For instance, AES
  using "EBC" SHOULD NOT be used to encrypt passwords, whereas "CBC"
  mode is okay since it a unique initialization vector (IV) should be
  used for each run.

Not only IV for CBC should be unique, it should be unpredictable (random =
or pseudo-random).
I also think that lowercase "should" here must be uppercase, or even =
MUST.

=20

Replaced =E2=80=9Cunique=E2=80=9D with =E2=80=9Cunpredictable=E2=80=9D

Replaced =E2=80=9Cshould=E2=80=9D with MUST.

=20

=20

Typos, nits:

Section 3.6:=20
  In order to thwart rainbow attacks, algorithms that result in a
  unique output for the same input SHOULD be used.=20

s/SHOULD/SHOULD NOT

=20

Egads - fixed!

=20





  For instance, AES
  using "EBC" SHOULD NOT be used to encrypt passwords, whereas "CBC"
  mode is okay since it a unique initialization vector (IV) should be
  used for each run.

s/EBC/ECB
s/it//
I believe "okay' is a bit of slang, isn't it?

=20

Fixed, now reads:

=20

          In order to thwart rainbow attacks, algorithms that result
          in a unique output for the same input SHOULD NOT be used.

          For instance, AES using "ECB" SHOULD NOT be used to

          encrypt passwords, whereas "CBC" mode is permissible

          since an unpredictable initialization vector (IV) MUST be

          used for each use.</t>

=20

Section 3.8:
  Since the module in this document only define groupings, these
  considerations are primarily for the designers of other modules that
  use these groupings.

s/define/defines

=20

Fixed!

=20

=20

=20

Kent, as author

=20

=20


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</o:shapelayout></xml><![endif]--></head><body lang=3DRU link=3Dblue =
vlink=3Dpurple style=3D'word-wrap: break-word;-webkit-nbsp-mode: =
space;line-break:after-white-space'><div class=3DWordSection1><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>Hi Kent,<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>thank you for addressing my comments. A bit more =
inline.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt'><div><p class=3DMsoNormal><span lang=3DEN-US> </span>[removing =
=E2=80=9Clast-call=E2=80=9D alias]<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><p class=3DMsoNormal>Hello =
Valery. &nbsp;<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Thank you for your SecDir review, it is very much =
appreciated and never too late!<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>More comments below.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Thanks,<o:p></o:p></p></div><div><p =
class=3DMsoNormal>Kent<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p><div><p class=3DMsoNormal>On =
Aug 24, 2021, at 2:29 PM, Valery Smyslov via Datatracker &lt;<a =
href=3D"mailto:noreply@ietf.org">noreply@ietf.org</a>&gt; =
wrote:<o:p></o:p></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal>Reviewer: Valery Smyslov<br>Review result: Has =
Issues<br><br>I have reviewed this document as part of the security =
directorate's ongoing<br>effort to review all IETF documents being =
processed by the IESG. &nbsp;These<br>comments were written primarily =
for the benefit of the security area directors.<br>Document editors and =
WG chairs should treat these comments just like any other<br>last call =
comments.<br><br>When I was re-assigned to review this draft the =
indicated deadline was already<br>missed by 8 months, so I don't know =
how relevant the review is. I reviewed<br>the latest -20 version of the =
draft instead of -18, that was =
requested.<o:p></o:p></p></div></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><p =
class=3DMsoNormal>Perfect.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p><div><div><p =
class=3DMsoNormal>The draft defines common YANG data types and groupings =
useful for cryptography.<br>I din't try to check the YANG module itself. =
<br><br>Issues:<br><br>Shouldn't a Privacy Considerations section be =
added to the draft?<br>The draft defines quite a lot of =
privacy-sensitive information (like certificates)<br>with no restriction =
on read access (as far as I =
understand).<o:p></o:p></p></div></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Both the &quot;trust-anchor-cert-grouping=E2=80=9D and =
=E2=80=9Cend-entity-cert-grouping=E2=80=9D groupings have&nbsp;<span =
style=3D'color:black'>&quot;nacm:default-deny-write=E2=80=9D that, to =
your point, does not restrict reads. &nbsp;That said, =
only&nbsp;management protocols having mutual authentication (e.g., SSH =
and/or TLS based transport) can access the data. &nbsp;</span><span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:black'>Is your concern that the =
certificate=E2=80=99s content would be visible to the administrators? =
&nbsp;</span><span style=3D'color:black'>Is your comment on end-entity =
certificates (containing personally-identifying information), more than =
trust-anchor-certificates?</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#44546A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 </span><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>Yes, it=E2=80=99s mostly on end-entity certificates, however there =
may be quite a lot of interesting<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 private =
information besides certificates.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 If this =
information is only visible to the administrators and the used =
management protocols must <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 have mutual =
authentication, then it=E2=80=99s probably not a big deal. I would have =
still added<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 a sentence =
about privacy of the stored data (i.e. that persons, that are allowed to =
access this data<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 are able to =
learn quite a lot of private information from it). I don=E2=80=99t =
insist though, it=E2=80=99s up to you.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p></div></div><div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p =
class=3DMsoNormal>Section 3.5.<br>While I understand and support the =
idea, expressed in this section, I think that<br>the way it is expressed =
makes it difficult to follow in practice. In general, it's<br>not always =
obvious how to estimate the &quot;strength&quot; of the underlying =
secure transport.<br>For this reason it's not clear for me how it is =
supposed to &quot;compare&quot; the <br>&quot;strength&quot; of the =
transport with the &quot;strength&quot; of the keys being =
transported.<o:p></o:p></p></div></div></blockquote><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>I =
saw language like this once in a DoD setting. &nbsp;I agree that it is =
difficult to implement in practice. &nbsp;I used =
=E2=80=9CSHOULD=E2=80=9D (not MUST) to buy some leeway for =
implementations to be compliant. &nbsp;Makes sense?<span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 My =
understanding of using RFC2119 language is that SHOULD is very close to =
MUST,<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 but allows =
some exceptions. So, I still think that you put a responsibility to =
make<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
security-related decisions on implementers, who often are not experts in =
this area.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal>FWIW, my YANG-driven server is able to remember what =
key the client used for authentication (e.g., RSA 2048) and register a =
callback to test that no greater keys (e.g., 3072 or 4096) are =
configured by that client. &nbsp;Additional <span lang=3DEN-US =
style=3D'color:#44546A'><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 What if the =
other key configured for the client is X25519? Which is =
stronger?<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US>logic would be needed to prevent a low-strength client from =
*reading* a high-strength key configured by another =
client=E2=80=A6though the issue can be alternatively resolved by =
configuring the TLS-stack to prevent low-strength =
algorithms.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 That was my =
point. I think that it=E2=80=99s better to require (by SHOULD) that =
only<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 those =
ciphersuites that were =E2=80=9Cvetted=E2=80=9D by IETF (i.e. got =
=E2=80=9CRecommended=E2=80=9D status) be used.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 This will make =
implementers=E2=80=99 life easier.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p></div><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>In addition, the requirement, that =
&quot;Implementations SHOULD fail the write-request if ever<br>the =
strength of the private key is greater then the strength of =
the<br>underlying transport&quot; looks wrong to me. </span>You don't =
need to have<br>1024 bits transport protocol strength to transfer 1024 =
bit key, since<br>even for say 256 bits it's infeasible to =
break.<o:p></o:p></p></div></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>IDK about this. &nbsp;Again, I saw this constraint =
once in a DoD setting. &nbsp;<span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 My (another) =
point was that there is generally no point to =
increase<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 security =
strength beyond some level. Currently it is =
believed<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 that 128 bit =
of symmetric key is infeasible to break (provided the algorithm is not =
broken itself),<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 If you are =
lucky have full-sized Post Quantum computer, it=E2=80=99ll be 256 =
bits.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 It=E2=80=99s =
enough to transfer symmetric keys with say 1024 bits of =
entropy<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (FWIW). So the =
requirement that the strength of transport must<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 be always =
greater than the strength of transported key <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 seems not a =
good requirement to me. Instead require that<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 the strength =
of transport be sufficient to make<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 infeasible for =
an attacker to break it.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
<o:p></o:p></span></p></div><div><div><p class=3DMsoNormal><span =
lang=3DEN-US>I think that the better approach would be to advise using =
strong<br>ciphersuites for transport protocols defined in corresponding =
RFCs.<br></span>For example, for TLS 1.3 there are ciphersuites marked =
as &quot;recommended&quot;,<br>that were evaluated by IETF crypto =
community.<o:p></o:p></p></div></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>I =
added this sentence:<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><span =
class=3Dapple-tab-span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 </span>Implementations SHOULD configure&nbsp;<span =
style=3D'color:black'>allowed transport&nbsp;<br></span><span =
class=3Dapple-tab-span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 </span>algorithms to include only&nbsp;those meeting =
local<o:p></o:p></p></div><p class=3DMsoNormal><span =
class=3Dapple-tab-span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 </span>policy (e.g., listed as &quot;recommended&quot; by =
the&nbsp;IETF).<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Good?<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'color:#44546A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 </span><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>Perfect</span><span lang=3DEN-US =
style=3D'color:#44546A'>.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#44546A'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#44546A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 </span><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>Regards,<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
Valery.</span><span =
lang=3DEN-US><br><br><o:p></o:p></span></p><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Section 3.6:<br>&nbsp;&nbsp;For =
instance, AES<br>&nbsp;&nbsp;using &quot;EBC&quot; SHOULD NOT be used to =
encrypt passwords, whereas &quot;CBC&quot;<br>&nbsp;&nbsp;mode is okay =
since it a </span>unique initialization vector (IV) should =
be<br>&nbsp;&nbsp;used for each run.<br><br>Not only IV for CBC should =
be unique, it should be unpredictable (random or pseudo-random).<br>I =
also think that lowercase &quot;should&quot; here must be uppercase, or =
even MUST.<o:p></o:p></p></div></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Replaced =E2=80=9Cunique=E2=80=9D with =
=E2=80=9Cunpredictable=E2=80=9D<o:p></o:p></p></div><div><p =
class=3DMsoNormal>Replaced =E2=80=9Cshould=E2=80=9D with =
MUST.<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p =
class=3DMsoNormal>Typos, nits:<br><br>Section 3.6: <br>&nbsp;&nbsp;In =
order to thwart rainbow attacks, algorithms that result in =
a<br>&nbsp;&nbsp;unique output for the same input SHOULD be used. =
<br><br>s/SHOULD/SHOULD =
NOT<o:p></o:p></p></div></div></blockquote><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Egads - fixed!<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><p =
class=3DMsoNormal><br><br><o:p></o:p></p><div><div><p =
class=3DMsoNormal>&nbsp;&nbsp;For instance, AES<br>&nbsp;&nbsp;using =
&quot;EBC&quot; SHOULD NOT be used to encrypt passwords, whereas =
&quot;CBC&quot;<br>&nbsp;&nbsp;mode is okay since it a unique =
initialization vector (IV) should be<br>&nbsp;&nbsp;used for each =
run.<br><br>s/EBC/ECB<br>s/it//<br>I believe &quot;okay' is a bit of =
slang, isn't it?<o:p></o:p></p></div></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Fixed, now reads:<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><span =
class=3Dapple-tab-span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 </span>In order to thwart rainbow attacks,&nbsp;algorithms that =
result<br><span =
class=3Dapple-tab-span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 </span>in a unique output for the same input SHOULD&nbsp;NOT be =
used.<o:p></o:p></p></div><div><p class=3DMsoNormal><span =
class=3Dapple-tab-span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 </span>For&nbsp;instance, AES using &quot;ECB&quot; SHOULD NOT be =
used&nbsp;to<o:p></o:p></p></div><div><p class=3DMsoNormal><span =
class=3Dapple-tab-span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 </span>encrypt passwords,&nbsp;whereas &quot;CBC&quot; mode is =
permissible<o:p></o:p></p></div><div><p class=3DMsoNormal><span =
class=3Dapple-tab-span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 </span>since an&nbsp;unpredictable&nbsp;initialization vector (IV) =
MUST be<o:p></o:p></p></div><div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span =
class=3Dapple-tab-span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 </span>used for&nbsp;each use.&lt;/t&gt;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p =
class=3DMsoNormal>Section 3.8:<br>&nbsp;&nbsp;Since the module in this =
document only define groupings, these<br>&nbsp;&nbsp;considerations are =
primarily for the designers of other modules that<br>&nbsp;&nbsp;use =
these =
groupings.<br><br>s/define/defines<o:p></o:p></p></div></div></blockquote=
><div><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><p =
class=3DMsoNormal>Fixed!<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Kent, as author<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div></div></div></body></html>
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From: "Valery Smyslov" <valery@smyslov.net>
To: "'Kent Watsen'" <kent+ietf@watsen.net>
Cc: <secdir@ietf.org>, <draft-ietf-netconf-crypto-types.all@ietf.org>, <netconf@ietf.org>
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Subject: Re: [secdir] [Last-Call] Secdir last call review of draft-ietf-netconf-crypto-types-20
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Spotted a typo in own message =E2=80=93 of course it was meant Quantum =
computer, not a Post Quantum one

(I have no idea what Post Quantum computer may mean :-), I know only =
Post-quantum cryptography).

=20

=20

In addition, the requirement, that "Implementations SHOULD fail the =
write-request if ever
the strength of the private key is greater then the strength of the
underlying transport" looks wrong to me. You don't need to have
1024 bits transport protocol strength to transfer 1024 bit key, since
even for say 256 bits it's infeasible to break.

=20

IDK about this.  Again, I saw this constraint once in a DoD setting. =20

=20

          My (another) point was that there is generally no point to =
increase

          security strength beyond some level. Currently it is believed

          that 128 bit of symmetric key is infeasible to break (provided =
the algorithm is not broken itself),

          If you are lucky have full-sized Post Quantum computer, =
it=E2=80=99ll be 256 bits.

          It=E2=80=99s enough to transfer symmetric keys with say 1024 =
bits of entropy

          (FWIW). So the requirement that the strength of transport must

          be always greater than the strength of transported key=20

          seems not a good requirement to me. Instead require that

          the strength of transport be sufficient to make

          infeasible for an attacker to break it.

         =20


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class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>Spotted a typo in own message =E2=80=93 of course it was meant =
Quantum computer, not a Post Quantum one<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>(I have no idea what Post Quantum computer may mean :-), I know only =
Post-quantum cryptography).<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt'><div style=3D'border:none;border-left:solid blue =
1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>In addition, the requirement, that =
&quot;Implementations SHOULD fail the write-request if ever<br>the =
strength of the private key is greater then the strength of =
the<br>underlying transport&quot; looks wrong to me. </span>You don't =
need to have<br>1024 bits transport protocol strength to transfer 1024 =
bit key, since<br>even for say 256 bits it's infeasible to =
break.<o:p></o:p></p></div></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>IDK about this. &nbsp;Again, I saw this constraint =
once in a DoD setting. &nbsp;<span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; My (another) =
point was that there is generally no point to =
increase<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; security =
strength beyond some level. Currently it is =
believed<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; that 128 bit =
of symmetric key is infeasible to break (provided the algorithm is not =
broken itself),<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; If you are =
lucky have full-sized Post Quantum computer, it=E2=80=99ll be 256 =
bits.<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; It=E2=80=99s =
enough to transfer symmetric keys with say 1024 bits of =
entropy<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (FWIW). So the =
requirement that the strength of transport must<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; be always =
greater than the strength of transported key <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; seems not a =
good requirement to me. Instead require that<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
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class=3DMsoNormal><span lang=3DEN-US =
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lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
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From nobody Fri Aug 27 13:01:16 2021
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From: Catherine Meadows via Datatracker <noreply@ietf.org>
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Date: Fri, 27 Aug 2021 13:01:05 -0700
Archived-At: <https://mailarchive.ietf.org/arch/msg/secdir/Ngi_6DwA7DBiWOI7MyFAXyoWI_E>
Subject: [secdir] Secdir last call review of draft-ietf-ntp-interleaved-modes-06
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Reviewer: Catherine Meadows
Review result: Has Nits

I have reviewed this document as part of the security directorate's
ongoing effort to review all IETF documents being processed by the
IESG.  These comments were written primarily for the benefit of the
security area directors.  Document editors and WG chairs should treat
these comments just like any other last call comments.

This document extends the Network Time Protocol (NTP) in RFC 5905 with modes
called “NTP interleaved modes” that allow principals to delay submitting
timestamps.  This allows more accurate timestamps to be computed.   However, it
also introduces  certain security risks.  In particular, the origin timestamp
is repurposed as a cookie that is used to identify a received packet is a
response to the last packet sent in the other direction of the association: it
is either 0 if the packet is not a response, or if it is a response, it is a
copy of either the receive or transmit timestamp, depending on the type of
packet.  This means that an attacker, even if it is off-path and has no access
to the packets themselves, would be able to forge a response if it is able to
guess a receive or transmit  response.    For this reason, it is recommended 
in  the Security Considerations Section that the receive (respectively
transmit) timestamps be randomized.  It is also pointed out that the NTP
interleaved modes  are subject to DoS attacks, so that clients SHOULD NOT rely
on servers to be able to respond in the interleaved mode.  In addition, since
zeroing out origin timestamps in order to protect observers from tracking
clients moving between networks is  not possible, NTP interleaved modes are
more vulnerable to such tracking.

I think that the authors have done a good job of identifying the security
issues that arise with NTP interleaved modes and means for dealing with them. 
In some places though,  the Security Considerations section could be a little
bit clearer.  I consider the following comments slightly about the nit level,
but close enough so I’m marking this as Ready With Nits.

1. The paragraph about security implications of using origin timestamps as
cookies has two subjects: off-line attackers guessing origin timestamps in
order to spoof responses, and attackers using origin timestamps to track
clients.  However, I found the presentation a little unclear on this point: the
last sentence, that discusses the tracking threat, does not explicitly say that
it is introducing a new topic.  I would suggest something like:

The use of timestamps in NTP interleaved modes also  makes clients more
vulnerable to tracking as they move between networks, since it is not possible
to zero out origin timestamps to protect against such exploitation.

You might also want to think about giving this sentence its own paragraph.

2.  I had trouble interpreting the following sentence:

The
   NTP state needs to be protected not only between the reception and
   transmission in order to send the peer a packet with a valid origin
   timestamp, but all the time to not lose the timestamps which will be
   needed to complete a measurement when the following packet in the
   interleaved mode is received.

It took me a while to see that what you were saying was NRP state needs to be
protected not only between the reception and transmission … , but all the time
… . The sentence is so long and carries so much information that I lost the
sense of the structure halfway through.  It would be better to break it down
into shorter sentences, e.g. start with “NRP state needs to be protected not
only between the reception and transmission, but all the time.”, and then go
into the reasons.




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Reviewer: Alan DeKok
Review result: Has nits

I have reviewed this document as part of the security directorate's
ongoing effort to review all IETF documents being processed by the
IESG.  These comments were written primarily for the benefit of the
security area directors.  Document editors and WG chairs should treat
these comments just like any other last call comments.

  Over all, I think this document is clear, useful and well written.

Section 1 says:

   ... Section 6.1.3.2 to clarify that all DNS resolvers and recursive =
MUST
   support and service both TCP and UDP queries.

NIT: bare "recursive" should perhaps be "recursive servers", to match =
similar text elsewhere in the document.


  It may be good to update Section 3 with notes on "head of line =
blocking".  This text could arguably be in RFC 7766, but having it here =
is a reasonable alternative:

   When using UDP as a transport for DNS, there is no ordering of
   packets.  If a packet is lost, that loss has no
   effect on subsequent packets sent by that client or server.

   Unlike UDP, TCP is subject to issues related to Head of Line (HoL)
   blocking.  This occurs when a TCP segment is lost and a subsequent
   TCP segment arrives out of order.  While the DNS implementation can
   process DNS packets out of order, the semantics of TCP makes this
   impossible.  This limitation can lower the maximum packet processing
   rate of DNS over TCP.


Section 6 says:

   Developers SHOULD also keep in mind connection reuse, query
   pipelining, and out-of-order responses when building and testing DNS
   monitoring applications.

  It would also be good to note that if the monitoring software tracks =
requests and responses, then clients could potentially attack the =
monitoring software, too.  i.e. by sending large volumes of requests to =
"black hole" IPs, which will never get a response.   So the monitoring =
software should have both timeouts for request/response tracking, and =
also limit the total number of request/responses which are monitored.



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Subject: Re: [secdir] [Last-Call] Secdir last call review of draft-ietf-netconf-crypto-types-20
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Hi Valery,


> On Aug 27, 2021, at 12:14 PM, Valery Smyslov <valery@smyslov.net> =
wrote:
>=20
> Hi Kent,
> =20
> thank you for addressing my comments. A bit more inline.

All good. =20
=20

> [removing =E2=80=9Clast-call=E2=80=9D alias]
> =20
> =20
> Hello Valery. =20
> =20
> Thank you for your SecDir review, it is very much appreciated and =
never too late!
> =20
> More comments below.
> =20
> Thanks,
> Kent
> =20
>=20
>=20
> On Aug 24, 2021, at 2:29 PM, Valery Smyslov via Datatracker =
<noreply@ietf.org <mailto:noreply@ietf.org>> wrote:
> =20
> Reviewer: Valery Smyslov
> Review result: Has Issues
>=20
> I have reviewed this document as part of the security directorate's =
ongoing
> effort to review all IETF documents being processed by the IESG.  =
These
> comments were written primarily for the benefit of the security area =
directors.
> Document editors and WG chairs should treat these comments just like =
any other
> last call comments.
>=20
> When I was re-assigned to review this draft the indicated deadline was =
already
> missed by 8 months, so I don't know how relevant the review is. I =
reviewed
> the latest -20 version of the draft instead of -18, that was =
requested.
> =20
> Perfect.
> =20
>=20
>=20
> The draft defines common YANG data types and groupings useful for =
cryptography.
> I din't try to check the YANG module itself.=20
>=20
> Issues:
>=20
> Shouldn't a Privacy Considerations section be added to the draft?
> The draft defines quite a lot of privacy-sensitive information (like =
certificates)
> with no restriction on read access (as far as I understand).
> =20
> =20
> Both the "trust-anchor-cert-grouping=E2=80=9D and =
=E2=80=9Cend-entity-cert-grouping=E2=80=9D groupings have =
"nacm:default-deny-write=E2=80=9D that, to your point, does not restrict =
reads.  That said, only management protocols having mutual =
authentication (e.g., SSH and/or TLS based transport) can access the =
data. =20
> =20
> Is your concern that the certificate=E2=80=99s content would be =
visible to the administrators?  Is your comment on end-entity =
certificates (containing personally-identifying information), more than =
trust-anchor-certificates?
> =20
>           Yes, it=E2=80=99s mostly on end-entity certificates, however =
there may be quite a lot of interesting
>           private information besides certificates.
> =20
>           If this information is only visible to the administrators =
and the used management protocols must=20
>           have mutual authentication, then it=E2=80=99s probably not a =
big deal. I would have still added
>           a sentence about privacy of the stored data (i.e. that =
persons, that are allowed to access this data
>           are able to learn quite a lot of private information from =
it). I don=E2=80=99t insist though, it=E2=80=99s up to you.


I added the following to Section 3.8 (The "ietf-crypto-types" YANG =
Module).

             The "cert-data" node:

                   The "cert-data" node, defined in both the =
"trust-anchor-cert-grouping"
                    and "end-entity-cert-grouping" groupings, is =
additionally sensitive to
                    read operations, as certificates sometimes convey =
personally identifying
                    information (especially end-entity certificates).  =
However, as it is
                    commonly understood that certificates are "public", =
the NACM extension
                    "nacm:default-deny-write" (not "default-deny-all") =
has been applied. It
                    is RECOMMENDED that implementations adjust =
read-access to certificates
                    to comply with local policy.

Is this okay?

Separately, I thought about if there are any other values in the module =
that may have privacy concerns but was unable to locate any.


>> Section 3.5.
>> While I understand and support the idea, expressed in this section, I =
think that
>> the way it is expressed makes it difficult to follow in practice. In =
general, it's
>> not always obvious how to estimate the "strength" of the underlying =
secure transport.
>> For this reason it's not clear for me how it is supposed to "compare" =
the=20
>> "strength" of the transport with the "strength" of the keys being =
transported.


All comments from this point to the end regard the Security =
Consideration "Strength of Keys Conveyed=E2=80=9D (was "Strength of Keys =
Configured=E2=80=9D).  I rewrote the section as follows.  Can you please =
check for accuracy?

      Strength of Keys Conveyed

           When accessing key values, it is desireable that =
implementations
            ensure that the strength of the keys being accessed is not =
greater
            than the strength of the underlying secure transport =
connection
            over which the keys are conveyed.  However, comparing key =
strengths
            can be complicated and difficult to implement in practice.

           That said, expert Security opinion suggests that already it =
is
            infeasible to break a 128-bit key using a classical =
computer, and=20
            thus the concern for conveying higher-strength keys begins =
to lose=20
            its allure.

            Implementations SHOULD only use transport algorithms to =
those=20
            meeting local policy.  A reasonable policy may, e.g., state =
that=20
            only algorithms listed as "recommended" by the IETF be used.
            Another reasonable policy may be to only use =
quantum-resistant=20
            algorithms.

Thanks!
Kent, as author


> =20
> I saw language like this once in a DoD setting.  I agree that it is =
difficult to implement in practice.  I used =E2=80=9CSHOULD=E2=80=9D =
(not MUST) to buy some leeway for implementations to be compliant.  =
Makes sense?
> =20
>           My understanding of using RFC2119 language is that SHOULD is =
very close to MUST,
>           but allows some exceptions. So, I still think that you put a =
responsibility to make
>           security-related decisions on implementers, who often are =
not experts in this area.
> =20
> FWIW, my YANG-driven server is able to remember what key the client =
used for authentication (e.g., RSA 2048) and register a callback to test =
that no greater keys (e.g., 3072 or 4096) are configured by that client. =
 Additional=20
> =20
>           What if the other key configured for the client is X25519? =
Which is stronger?
> =20
> logic would be needed to prevent a low-strength client from *reading* =
a high-strength key configured by another client=E2=80=A6though the =
issue can be alternatively resolved by configuring the TLS-stack to =
prevent low-strength algorithms.
> =20
>           That was my point. I think that it=E2=80=99s better to =
require (by SHOULD) that only
>           those ciphersuites that were =E2=80=9Cvetted=E2=80=9D by =
IETF (i.e. got =E2=80=9CRecommended=E2=80=9D status) be used.
>           This will make implementers=E2=80=99 life easier.
> =20
> In addition, the requirement, that "Implementations SHOULD fail the =
write-request if ever
> the strength of the private key is greater then the strength of the
> underlying transport" looks wrong to me. You don't need to have
> 1024 bits transport protocol strength to transfer 1024 bit key, since
> even for say 256 bits it's infeasible to break.
> =20
> IDK about this.  Again, I saw this constraint once in a DoD setting. =20=

> =20
>           My (another) point was that there is generally no point to =
increase
>           security strength beyond some level. Currently it is =
believed
>           that 128 bit of symmetric key is infeasible to break =
(provided the algorithm is not broken itself),
>           If you are lucky have full-sized Post Quantum computer, =
it=E2=80=99ll be 256 bits.
>           It=E2=80=99s enough to transfer symmetric keys with say 1024 =
bits of entropy
>           (FWIW). So the requirement that the strength of transport =
must
>           be always greater than the strength of transported key=20
>           seems not a good requirement to me. Instead require that
>           the strength of transport be sufficient to make
>           infeasible for an attacker to break it.
>          =20
> I think that the better approach would be to advise using strong
> ciphersuites for transport protocols defined in corresponding RFCs.
> For example, for TLS 1.3 there are ciphersuites marked as =
"recommended",
> that were evaluated by IETF crypto community.
> =20
> I added this sentence:
> =20
>           Implementations SHOULD configure allowed transport=20
>           algorithms to include only those meeting local
>           policy (e.g., listed as "recommended" by the IETF).
> =20
> Good?
> =20
>           Perfect.
> =20
>           Regards,
>           Valery.
>=20


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">Hi =
Valery,<div class=3D""><br class=3D""><div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D"">On Aug 27, 2021, at 12:14 PM, =
Valery Smyslov &lt;<a href=3D"mailto:valery@smyslov.net" =
class=3D"">valery@smyslov.net</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><meta =
charset=3D"UTF-8" class=3D""><div class=3D"WordSection1" style=3D"page: =
WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; =
font-size: 14px; font-style: normal; font-variant-caps: normal; =
font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;"><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
lang=3D"EN-US" style=3D"font-size: 14pt; font-family: Calibri, =
sans-serif; color: rgb(68, 84, 106);" class=3D"">Hi Kent,<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; font-family: =
Calibri, sans-serif; color: rgb(68, 84, 106);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; =
font-family: Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">thank you for addressing my comments. A bit more =
inline.</span></div></div></div></blockquote><div><br =
class=3D""></div><div>All good. &nbsp;</div><div><span style=3D"color: =
rgb(68, 84, 106); font-family: Calibri, sans-serif; font-size: 14pt; =
caret-color: rgb(0, 0, 0);" class=3D"">&nbsp;</span></div><div><span =
style=3D"color: rgb(68, 84, 106); font-family: Calibri, sans-serif; =
font-size: 14pt; caret-color: rgb(0, 0, 0);" class=3D""><br =
class=3D""></span></div><blockquote type=3D"cite" class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;"><div style=3D"border-style: none none none =
solid; border-left-width: 1.5pt; border-left-color: blue; padding: 0cm =
0cm 0cm 4pt;" class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span lang=3D"EN-US" class=3D""></span>[removing =
=E2=80=9Clast-call=E2=80=9D alias]<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D"">Hello Valery. &nbsp;<o:p class=3D""></o:p></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D"">Thank you for your SecDir review, it is =
very much appreciated and never too late!<o:p class=3D""></o:p></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D"">More comments below.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D"">Thanks,<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D"">Kent<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><br class=3D""><br class=3D""><o:p =
class=3D""></o:p></div><div class=3D""><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D"">On Aug 24, 2021, at 2:29 PM, Valery Smyslov via =
Datatracker &lt;<a href=3D"mailto:noreply@ietf.org" style=3D"color: =
purple; text-decoration: underline;" class=3D"">noreply@ietf.org</a>&gt; =
wrote:<o:p class=3D""></o:p></div></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D"">Reviewer: =
Valery Smyslov<br class=3D"">Review result: Has Issues<br class=3D""><br =
class=3D"">I have reviewed this document as part of the security =
directorate's ongoing<br class=3D"">effort to review all IETF documents =
being processed by the IESG. &nbsp;These<br class=3D"">comments were =
written primarily for the benefit of the security area directors.<br =
class=3D"">Document editors and WG chairs should treat these comments =
just like any other<br class=3D"">last call comments.<br class=3D""><br =
class=3D"">When I was re-assigned to review this draft the indicated =
deadline was already<br class=3D"">missed by 8 months, so I don't know =
how relevant the review is. I reviewed<br class=3D"">the latest -20 =
version of the draft instead of -18, that was requested.<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D"">Perfect.<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><br class=3D""><br class=3D""><o:p =
class=3D""></o:p></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D"">The draft defines common =
YANG data types and groupings useful for cryptography.<br class=3D"">I =
din't try to check the YANG module itself.<span =
class=3D"Apple-converted-space">&nbsp;</span><br class=3D""><br =
class=3D"">Issues:<br class=3D""><br class=3D"">Shouldn't a Privacy =
Considerations section be added to the draft?<br class=3D"">The draft =
defines quite a lot of privacy-sensitive information (like =
certificates)<br class=3D"">with no restriction on read access (as far =
as I understand).<o:p class=3D""></o:p></div></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D"">Both the "trust-anchor-cert-grouping=E2=80=
=9D and =E2=80=9Cend-entity-cert-grouping=E2=80=9D groupings =
have&nbsp;<span style=3D"" class=3D"">"nacm:default-deny-write=E2=80=9D =
that, to your point, does not restrict reads. &nbsp;That said, =
only&nbsp;management protocols having mutual authentication (e.g., SSH =
and/or TLS based transport) can access the data. &nbsp;</span><span =
lang=3D"EN-US" class=3D""><o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 14pt; font-family: Calibri, sans-serif; color: =
rgb(68, 84, 106);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span lang=3D"EN-US" =
style=3D"" class=3D"">Is your concern that the certificate=E2=80=99s =
content would be visible to the administrators? &nbsp;</span><span =
style=3D"" class=3D"">Is your comment on end-entity certificates =
(containing personally-identifying information), more than =
trust-anchor-certificates?</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span lang=3D"EN-US" style=3D"color: =
rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span><span lang=3D"EN-US" =
style=3D"font-size: 14pt; font-family: Calibri, sans-serif; color: =
rgb(68, 84, 106);" class=3D"">Yes, it=E2=80=99s mostly on end-entity =
certificates, however there may be quite a lot of interesting<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; font-family: =
Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
private information besides certificates.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; font-family: =
Calibri, sans-serif; color: rgb(68, 84, 106);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; =
font-family: Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; If =
this information is only visible to the administrators and the used =
management protocols must<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; font-family: =
Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; have =
mutual authentication, then it=E2=80=99s probably not a big deal. I =
would have still added<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 14pt; font-family: Calibri, sans-serif; color: =
rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; a =
sentence about privacy of the stored data (i.e. that persons, that are =
allowed to access this data<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 14pt; font-family: Calibri, sans-serif; color: =
rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; are =
able to learn quite a lot of private information from it). I don=E2=80=99t=
 insist though, it=E2=80=99s up to you.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; font-family: =
Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D""></span></div></div></div></div></div></div></blockquote><div><b=
r class=3D""></div><div><br class=3D""></div><div>I added the following =
to Section 3.8 (The "ietf-crypto-types" YANG Module).</div><div><br =
class=3D""></div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;The "cert-data" node:<br class=3D""><br class=3D""></div><div>&nbsp;=
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;The =
"cert-data" node, defined in&nbsp;both the =
"trust-anchor-cert-grouping"<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;and =
"end-entity-cert-grouping"&nbsp;groupings, is additionally sensitive =
to<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;&nbsp;read operations, as certificates&nbsp;sometimes =
convey personally identifying<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;information (especially =
end-entity&nbsp;certificates).&nbsp;&nbsp;However, as it is<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;&nbsp;commonly understood that certificates&nbsp;are =
"public", the NACM extension<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;"nacm:default-deny-write" =
(not&nbsp;"default-deny-all") has been applied. It<br class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;is =
RECOMMENDED that implementations&nbsp;adjust read-access to =
certificates<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;to comply with local policy.<br =
class=3D""><br class=3D""></div><div>Is this okay?</div><div><br =
class=3D""></div><div>Separately, I thought about if there are any other =
values in the module that may have privacy concerns but was unable to =
locate any.</div><div><br class=3D""></div><div><br =
class=3D""></div><blockquote type=3D"cite" class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;"><div style=3D"border-style: none none none =
solid; border-left-width: 1.5pt; border-left-color: blue; padding: 0cm =
0cm 0cm 4pt;" class=3D""><div class=3D""><div class=3D""><blockquote =
style=3D"margin-top: 5pt; margin-bottom: 5pt;" class=3D"" =
type=3D"cite"><div class=3D""><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D"">Section 3.5.<br class=3D"">While I understand and =
support the idea, expressed in this section, I think that<br =
class=3D"">the way it is expressed makes it difficult to follow in =
practice. In general, it's<br class=3D"">not always obvious how to =
estimate the "strength" of the underlying secure transport.<br =
class=3D"">For this reason it's not clear for me how it is supposed to =
"compare" the<span class=3D"Apple-converted-space">&nbsp;</span><br =
class=3D"">"strength" of the transport with the "strength" of the keys =
being transported.<o:p =
class=3D""></o:p></div></div></div></blockquote><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" =
class=3D""></div></div></div></div></div></div></blockquote><div><br =
class=3D""></div><div><br class=3D""></div><div><div style=3D"caret-color:=
 rgb(0, 0, 0); color: rgb(0, 0, 0);">All comments from this point to the =
end regard the Security Consideration "Strength of Keys Conveyed=E2=80=9D =
(was&nbsp;<font color=3D"#000000" class=3D""><span style=3D"caret-color: =
rgb(255, 255, 255);" class=3D"">"Strength of Keys&nbsp;Configured=E2=80=9D=
). &nbsp;I rewrote the section as follows. &nbsp;Can you please check =
for&nbsp;accuracy?</span></font></div><div style=3D"caret-color: rgb(0, =
0, 0); color: rgb(0, 0, 0);"><br class=3D""></div><div =
style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">&nbsp; &nbsp; =
&nbsp;&nbsp;Strength of Keys Conveyed</div><div style=3D"caret-color: =
rgb(0, 0, 0); color: rgb(0, 0, 0);"><br class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;When accessing key values, it is =
desireable&nbsp;that implementations<br class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;&nbsp;ensure that the strength of the keys =
being&nbsp;accessed is not greater<br class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;&nbsp;than the strength of the underlying =
secure&nbsp;transport connection<br class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;&nbsp;over which the keys are =
conveyed.&nbsp;&nbsp;However,&nbsp;comparing key strengths<br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;can be =
complicated and difficult to implement&nbsp;in practice.</div><div =
style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;That said, expert =
Security opinion suggests&nbsp;that already it is<br class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;infeasible to break a 128-bit =
key using a&nbsp;classical computer, and&nbsp;<br class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;thus the concern for conveying =
higher-strength keys begins to lose&nbsp;<br class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;its allure.</div><div =
style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><br =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;&nbsp;Implementations SHOULD only use transport&nbsp;algorithms to =
those&nbsp;<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;&nbsp;meeting local policy.&nbsp;&nbsp;A reasonable =
policy&nbsp;may, e.g., state that&nbsp;<br class=3D"">&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;only algorithms listed as "recommended" =
by&nbsp;the IETF be used.<br class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;&nbsp;Another reasonable policy may be to only =
use&nbsp;quantum-resistant&nbsp;<br class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;&nbsp;algorithms.<br class=3D""><br =
class=3D""></div><div style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, =
0, 0);">Thanks!</div><div style=3D"caret-color: rgb(0, 0, 0); color: =
rgb(0, 0, 0);">Kent, as author</div><div style=3D"caret-color: rgb(0, 0, =
0); color: rgb(0, 0, 0);"><br class=3D""></div></div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;"><div style=3D"border-style: none none none =
solid; border-left-width: 1.5pt; border-left-color: blue; padding: 0cm =
0cm 0cm 4pt;" class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D"">I saw language like this once in a DoD =
setting. &nbsp;I agree that it is difficult to implement in practice. =
&nbsp;I used =E2=80=9CSHOULD=E2=80=9D (not MUST) to buy some leeway for =
implementations to be compliant. &nbsp;Makes sense?<span lang=3D"EN-US" =
class=3D""><o:p class=3D""></o:p></span></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; =
font-family: Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
14pt; font-family: Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; My =
understanding of using RFC2119 language is that SHOULD is very close to =
MUST,<o:p class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; =
font-family: Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; but =
allows some exceptions. So, I still think that you put a responsibility =
to make<o:p class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; =
font-family: Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
security-related decisions on implementers, who often are not experts in =
this area.<o:p class=3D""></o:p></span></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span lang=3D"EN-US" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D"">FWIW, my =
YANG-driven server is able to remember what key the client used for =
authentication (e.g., RSA 2048) and register a callback to test that no =
greater keys (e.g., 3072 or 4096) are configured by that client. =
&nbsp;Additional<span class=3D"Apple-converted-space">&nbsp;</span><span =
lang=3D"EN-US" style=3D"color: rgb(68, 84, 106);" class=3D""><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; font-family: =
Calibri, sans-serif; color: rgb(68, 84, 106);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; =
font-family: Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; What =
if the other key configured for the client is X25519? Which is =
stronger?<o:p class=3D""></o:p></span></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; =
font-family: Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span lang=3D"EN-US" class=3D"">logic =
would be needed to prevent a low-strength client from *reading* a =
high-strength key configured by another client=E2=80=A6though the issue =
can be alternatively resolved by configuring the TLS-stack to prevent =
low-strength algorithms.<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 14pt; font-family: Calibri, sans-serif; color: =
rgb(68, 84, 106);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; =
font-family: Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; That =
was my point. I think that it=E2=80=99s better to require (by SHOULD) =
that only<o:p class=3D""></o:p></span></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; =
font-family: Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; those =
ciphersuites that were =E2=80=9Cvetted=E2=80=9D by IETF (i.e. got =
=E2=80=9CRecommended=E2=80=9D status) be used.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; font-family: =
Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; This =
will make implementers=E2=80=99 life easier.<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span lang=3D"EN-US" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
lang=3D"EN-US" class=3D"">In addition, the requirement, that =
"Implementations SHOULD fail the write-request if ever<br class=3D"">the =
strength of the private key is greater then the strength of the<br =
class=3D"">underlying transport" looks wrong to me.<span =
class=3D"Apple-converted-space">&nbsp;</span></span>You don't need to =
have<br class=3D"">1024 bits transport protocol strength to transfer =
1024 bit key, since<br class=3D"">even for say 256 bits it's infeasible =
to break.<o:p class=3D""></o:p></div></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D"">IDK about this. &nbsp;Again, I saw this =
constraint once in a DoD setting. &nbsp;<span lang=3D"EN-US" =
class=3D""><o:p class=3D""></o:p></span></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; =
font-family: Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: =
14pt; font-family: Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; My =
(another) point was that there is generally no point to increase<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; font-family: =
Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
security strength beyond some level. Currently it is believed<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; font-family: =
Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; that =
128 bit of symmetric key is infeasible to break (provided the algorithm =
is not broken itself),<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span lang=3D"EN-US" =
style=3D"font-size: 14pt; font-family: Calibri, sans-serif; color: =
rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; If you =
are lucky have full-sized Post Quantum computer, it=E2=80=99ll be 256 =
bits.<o:p class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; =
font-family: Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; It=E2=80=
=99s enough to transfer symmetric keys with say 1024 bits of entropy<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; font-family: =
Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
(FWIW). So the requirement that the strength of transport must<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; font-family: =
Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; be =
always greater than the strength of transported key<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; font-family: =
Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; seems =
not a good requirement to me. Instead require that<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; font-family: =
Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the =
strength of transport be sufficient to make<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; font-family: =
Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
infeasible for an attacker to break it.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; font-family: =
Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></span></div></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span lang=3D"EN-US" =
class=3D"">I think that the better approach would be to advise using =
strong<br class=3D"">ciphersuites for transport protocols defined in =
corresponding RFCs.<br class=3D""></span>For example, for TLS 1.3 there =
are ciphersuites marked as "recommended",<br class=3D"">that were =
evaluated by IETF crypto community.<o:p =
class=3D""></o:p></div></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D"">I added this sentence:<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><span =
class=3D"apple-tab-span">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span>Implementations =
SHOULD configure&nbsp;<span style=3D"" class=3D"">allowed =
transport&nbsp;<br class=3D""></span><span =
class=3D"apple-tab-span">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;<span class=3D"Apple-converted-space">&nbsp;</span></span>algorithms =
to include only&nbsp;those meeting local<o:p =
class=3D""></o:p></div></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span =
class=3D"apple-tab-span">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;<span class=3D"Apple-converted-space">&nbsp;</span></span>policy =
(e.g., listed as "recommended" by the&nbsp;IETF).<o:p =
class=3D""></o:p></div><div class=3D""><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D"">Good?<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span lang=3D"EN-US" =
style=3D"color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span><span lang=3D"EN-US" =
style=3D"font-size: 14pt; font-family: Calibri, sans-serif; color: =
rgb(68, 84, 106);" class=3D"">Perfect</span><span lang=3D"EN-US" =
style=3D"color: rgb(68, 84, 106);" class=3D"">.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"color: rgb(68, 84, 106);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span lang=3D"EN-US" style=3D"color: =
rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span></span><span lang=3D"EN-US" =
style=3D"font-size: 14pt; font-family: Calibri, sans-serif; color: =
rgb(68, 84, 106);" class=3D"">Regards,<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span lang=3D"EN-US" style=3D"font-size: 14pt; font-family: =
Calibri, sans-serif; color: rgb(68, 84, 106);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
Valery.</span><span lang=3D"EN-US" class=3D""><br class=3D""><br =
class=3D""><o:p =
class=3D""></o:p></span></div></div></div></div></div></blockquote></div><=
br class=3D""></div></body></html>=

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From: "Wessels, Duane" <dwessels@verisign.com>
To: Alan DeKok <aland@freeradius.org>
CC: "secdir@ietf.org" <secdir@ietf.org>, "draft-ietf-dnsop-dns-tcp-requirements.all@ietf.org" <draft-ietf-dnsop-dns-tcp-requirements.all@ietf.org>
Thread-Topic: [EXTERNAL] Secdir review of draft-ietf-dnsop-dns-tcp-requirements-12
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> On Aug 27, 2021, at 1:28 PM, Alan DeKok <aland@freeradius.org> wrote:
>=20
> Caution: This email originated from outside the organization. Do not =
click links or open attachments unless you recognize the sender and know =
the content is safe.=20
>=20
> Reviewer: Alan DeKok
> Review result: Has nits

Thanks for the review Alan.

>=20
> I have reviewed this document as part of the security directorate's
> ongoing effort to review all IETF documents being processed by the
> IESG.  These comments were written primarily for the benefit of the
> security area directors.  Document editors and WG chairs should treat
> these comments just like any other last call comments.
>=20
>  Over all, I think this document is clear, useful and well written.
>=20
> Section 1 says:
>=20
>   ... Section 6.1.3.2 to clarify that all DNS resolvers and recursive =
MUST
>   support and service both TCP and UDP queries.
>=20
> NIT: bare "recursive" should perhaps be "recursive servers", to match =
similar text elsewhere in the document.

Yep, I'll make that change.

>=20
>=20
>  It may be good to update Section 3 with notes on "head of line =
blocking".  This text could arguably be in RFC 7766, but having it here =
is a reasonable alternative:
>=20
>   When using UDP as a transport for DNS, there is no ordering of
>   packets.  If a packet is lost, that loss has no
>   effect on subsequent packets sent by that client or server.
>=20
>   Unlike UDP, TCP is subject to issues related to Head of Line (HoL)
>   blocking.  This occurs when a TCP segment is lost and a subsequent
>   TCP segment arrives out of order.  While the DNS implementation can
>   process DNS packets out of order, the semantics of TCP makes this
>   impossible.  This limitation can lower the maximum packet processing
>   rate of DNS over TCP.

Can you clarify by what you mean with "While the DNS implementation can
process DNS packets out of order, the semantics of TCP makes this =
impossible."
Do you mean in the case of a lost TCP segment, or in general?

I wonder if this might fit equally well under a new 2.x subsection.




>=20
>=20
> Section 6 says:
>=20
>   Developers SHOULD also keep in mind connection reuse, query
>   pipelining, and out-of-order responses when building and testing DNS
>   monitoring applications.
>=20
>  It would also be good to note that if the monitoring software tracks =
requests and responses, then clients could potentially attack the =
monitoring software, too.  i.e. by sending large volumes of requests to =
"black hole" IPs, which will never get a response.   So the monitoring =
software should have both timeouts for request/response tracking, and =
also limit the total number of request/responses which are monitored.


Yes, thats a good point.  I will come up with some text for that.

DW



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On Aug 27, 2021, at 7:05 PM, Wessels, Duane =
<dwessels=3D40verisign.com@dmarc.ietf.org> wrote:
> Can you clarify by what you mean with "While the DNS implementation =
can
> process DNS packets out of order, the semantics of TCP makes this =
impossible."
> Do you mean in the case of a lost TCP segment, or in general?

  I mean that DNS has no inter-packet dependencies or ordering.  But =
when DNS is transported over TCP, TCP enforces ordering, because it's a =
stream protocol.

  If a client sends packets N, N+1, N+2 over UDP, then losing packet N =
has no impact on N+1 or N+2.  However, when TCP is used, the OS has to =
do TCP ACK signalling, and send packet N before N+1 or N+2 can be =
processed.

  That sequencing is a limitation of TCP, and not of DNS.  But it still =
affects DNS.

> I wonder if this might fit equally well under a new 2.x subsection.

  Sure.

  Alan DeKok.


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>>> Catherine Meadows via Datatracker <noreply@ietf.org> schrieb am 27.08.2021
um
22:01 in Nachricht <163009446578.19033.10956390674873739814@ietfa.amsl.com>:
...
> 2.  I had trouble interpreting the following sentence:
> 
> The
>    NTP state needs to be protected not only between the reception and

My guess is that "protected" (prevent access) actually means "preserved" (kept
for later reading) here.

>    transmission in order to send the peer a packet with a valid origin
>    timestamp, but all the time to not lose the timestamps which will be
>    needed to complete a measurement when the following packet in the
>    interleaved mode is received.
> 
> It took me a while to see that what you were saying was NRP state needs to 
> be
> protected not only between the reception and transmission … , but all the 
> time
> … . The sentence is so long and carries so much information that I lost the
> sense of the structure halfway through.  It would be better to break it
down
> into shorter sentences, e.g. start with “NRP state needs to be protected
not
> only between the reception and transmission, but all the time.”, and then
go
> into the reasons.
> 
> 
> 
> _______________________________________________
> ntp mailing list
> ntp@ietf.org 
> https://www.ietf.org/mailman/listinfo/ntp 




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Subject: Re: [secdir] [Last-Call] Secdir last call review of draft-ietf-netconf-crypto-types-20
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Hi Kent,

=20

please. see inline.

=20

Hi Valery,

=20





On Aug 27, 2021, at 12:14 PM, Valery Smyslov <valery@smyslov.net> wrote:

=20

Hi Kent,

=20

thank you for addressing my comments. A bit more inline.

=20

All good. =20

=20





[removing =E2=80=9Clast-call=E2=80=9D alias]

=20

=20

Hello Valery. =20

=20

Thank you for your SecDir review, it is very much appreciated and never =
too late!

=20

More comments below.

=20

Thanks,

Kent

=20






On Aug 24, 2021, at 2:29 PM, Valery Smyslov via Datatracker < =
<mailto:noreply@ietf.org> noreply@ietf.org> wrote:

=20

Reviewer: Valery Smyslov
Review result: Has Issues

I have reviewed this document as part of the security directorate's =
ongoing
effort to review all IETF documents being processed by the IESG.  These
comments were written primarily for the benefit of the security area =
directors.
Document editors and WG chairs should treat these comments just like any =
other
last call comments.

When I was re-assigned to review this draft the indicated deadline was =
already
missed by 8 months, so I don't know how relevant the review is. I =
reviewed
the latest -20 version of the draft instead of -18, that was requested.

=20

Perfect.

=20






The draft defines common YANG data types and groupings useful for =
cryptography.
I din't try to check the YANG module itself.=20

Issues:

Shouldn't a Privacy Considerations section be added to the draft?
The draft defines quite a lot of privacy-sensitive information (like =
certificates)
with no restriction on read access (as far as I understand).

=20

=20

Both the "trust-anchor-cert-grouping=E2=80=9D and =
=E2=80=9Cend-entity-cert-grouping=E2=80=9D groupings have =
"nacm:default-deny-write=E2=80=9D that, to your point, does not restrict =
reads.  That said, only management protocols having mutual =
authentication (e.g., SSH and/or TLS based transport) can access the =
data. =20

=20

Is your concern that the certificate=E2=80=99s content would be visible =
to the administrators?  Is your comment on end-entity certificates =
(containing personally-identifying information), more than =
trust-anchor-certificates?

=20

          Yes, it=E2=80=99s mostly on end-entity certificates, however =
there may be quite a lot of interesting

          private information besides certificates.

=20

          If this information is only visible to the administrators and =
the used management protocols must=20

          have mutual authentication, then it=E2=80=99s probably not a =
big deal. I would have still added

          a sentence about privacy of the stored data (i.e. that =
persons, that are allowed to access this data

          are able to learn quite a lot of private information from it). =
I don=E2=80=99t insist though, it=E2=80=99s up to you.

=20

=20

I added the following to Section 3.8 (The "ietf-crypto-types" YANG =
Module).

=20

             The "cert-data" node:

                   The "cert-data" node, defined in both the =
"trust-anchor-cert-grouping"
                    and "end-entity-cert-grouping" groupings, is =
additionally sensitive to
                    read operations, as certificates sometimes convey =
personally identifying
                    information (especially end-entity certificates).  =
However, as it is
                    commonly understood that certificates are "public", =
the NACM extension
                    "nacm:default-deny-write" (not "default-deny-all") =
has been applied. It
                    is RECOMMENDED that implementations adjust =
read-access to certificates
                    to comply with local policy.

Is this okay?

=20

          Yes, thanks.

=20

Separately, I thought about if there are any other values in the module =
that may have privacy concerns but was unable to locate any.

=20

          certificate-signing-request?

=20

=20

Section 3.5.
While I understand and support the idea, expressed in this section, I =
think that
the way it is expressed makes it difficult to follow in practice. In =
general, it's
not always obvious how to estimate the "strength" of the underlying =
secure transport.
For this reason it's not clear for me how it is supposed to "compare" =
the=20
"strength" of the transport with the "strength" of the keys being =
transported.

=20

=20

All comments from this point to the end regard the Security =
Consideration "Strength of Keys Conveyed=E2=80=9D (was "Strength of Keys =
Configured=E2=80=9D).  I rewrote the section as follows.  Can you please =
check for accuracy?

=20

      Strength of Keys Conveyed


           When accessing key values, it is desireable that =
implementations
            ensure that the strength of the keys being accessed is not =
greater
            than the strength of the underlying secure transport =
connection
            over which the keys are conveyed.  However, comparing key =
strengths
            can be complicated and difficult to implement in practice.


           That said, expert Security opinion suggests that already it =
is
            infeasible to break a 128-bit key using a classical =
computer, and=20

=20

          s/key/symmetric key/


            thus the concern for conveying higher-strength keys begins =
to lose=20
            its allure.


            Implementations SHOULD only use transport algorithms to =
those=20

          s/transport algorithms/secure transport/

            meeting local policy.  A reasonable policy may, e.g., state =
that=20
            only algorithms listed as "recommended" by the IETF be used.

          s\algorithms/ciphersuites/


            Another reasonable policy may be to only use =
quantum-resistant=20
            algorithms.

          Works for me with changes above. I would only add a few words =
at the end of the second para that=20
          things may change in the future (e.g. if full-size quantum =
computers appear),
          so it is recommended to follow up-to-date advise from crypto =
community
          when protecting transport channel.

          I would also remove the last sentence in the last para, mostly =
because
          it=E2=80=99s difficult to follow in practice (we still know =
not much about post-quantum crypto
          and generally it=E2=80=99s not yet widely supported in =
protocols like TLS) and instead reference RFC 7525
          which contains recommendations how to use TLS in applications.
          I don=E2=80=99t know in similar RFC exists for SSH, sorry...



          Regards,
          Valery.

Thanks!

Kent, as author

=20





=20

I saw language like this once in a DoD setting.  I agree that it is =
difficult to implement in practice.  I used =E2=80=9CSHOULD=E2=80=9D =
(not MUST) to buy some leeway for implementations to be compliant.  =
Makes sense?

=20

          My understanding of using RFC2119 language is that SHOULD is =
very close to MUST,

          but allows some exceptions. So, I still think that you put a =
responsibility to make

          security-related decisions on implementers, who often are not =
experts in this area.

=20

FWIW, my YANG-driven server is able to remember what key the client used =
for authentication (e.g., RSA 2048) and register a callback to test that =
no greater keys (e.g., 3072 or 4096) are configured by that client.  =
Additional=20

=20

          What if the other key configured for the client is X25519? =
Which is stronger?

=20

logic would be needed to prevent a low-strength client from *reading* a =
high-strength key configured by another client=E2=80=A6though the issue =
can be alternatively resolved by configuring the TLS-stack to prevent =
low-strength algorithms.

=20

          That was my point. I think that it=E2=80=99s better to require =
(by SHOULD) that only

          those ciphersuites that were =E2=80=9Cvetted=E2=80=9D by IETF =
(i.e. got =E2=80=9CRecommended=E2=80=9D status) be used.

          This will make implementers=E2=80=99 life easier.

=20

In addition, the requirement, that "Implementations SHOULD fail the =
write-request if ever
the strength of the private key is greater then the strength of the
underlying transport" looks wrong to me. You don't need to have
1024 bits transport protocol strength to transfer 1024 bit key, since
even for say 256 bits it's infeasible to break.

=20

IDK about this.  Again, I saw this constraint once in a DoD setting. =20

=20

          My (another) point was that there is generally no point to =
increase

          security strength beyond some level. Currently it is believed

          that 128 bit of symmetric key is infeasible to break (provided =
the algorithm is not broken itself),

          If you are lucky have full-sized Post Quantum computer, =
it=E2=80=99ll be 256 bits.

          It=E2=80=99s enough to transfer symmetric keys with say 1024 =
bits of entropy

          (FWIW). So the requirement that the strength of transport must

          be always greater than the strength of transported key=20

          seems not a good requirement to me. Instead require that

          the strength of transport be sufficient to make

          infeasible for an attacker to break it.

         =20

I think that the better approach would be to advise using strong
ciphersuites for transport protocols defined in corresponding RFCs.
For example, for TLS 1.3 there are ciphersuites marked as "recommended",
that were evaluated by IETF crypto community.

=20

I added this sentence:

=20

          Implementations SHOULD configure allowed transport=20
          algorithms to include only those meeting local

          policy (e.g., listed as "recommended" by the IETF).

=20

Good?

=20

          Perfect.

=20

          Regards,

          Valery.




=20


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<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DRU link=3Dblue =
vlink=3Dpurple style=3D'word-wrap: break-word;-webkit-nbsp-mode: =
space;line-break:after-white-space'><div class=3DWordSection1><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>Hi Kent,<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>please. see inline.<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt'><p class=3DMsoNormal>Hi Valery,<o:p></o:p></p><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><p =
class=3DMsoNormal><br><br><o:p></o:p></p><div><p class=3DMsoNormal>On =
Aug 27, 2021, at 12:14 PM, Valery Smyslov &lt;<a =
href=3D"mailto:valery@smyslov.net">valery@smyslov.net</a>&gt; =
wrote:<o:p></o:p></p></div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p><div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>Hi Kent,</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>thank you for addressing my comments. A bit more =
inline.</span><o:p></o:p></p></div></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>All good. &nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><br><br></span><o:p></o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt'><div><div><p class=3DMsoNormal>[removing =
=E2=80=9Clast-call=E2=80=9D =
alias]<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><p =
class=3DMsoNormal>Hello Valery. &nbsp;<o:p></o:p></p></div><div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>Thank you for your SecDir review, it is very much =
appreciated and never too late!<o:p></o:p></p></div><div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>More comments =
below.<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>Thanks,<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>Kent<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal><br><br><br><o:p></o:p></p></div><div><div><p =
class=3DMsoNormal>On Aug 24, 2021, at 2:29 PM, Valery Smyslov via =
Datatracker &lt;<a href=3D"mailto:noreply@ietf.org"><span =
style=3D'color:purple'>noreply@ietf.org</span></a>&gt; =
wrote:<o:p></o:p></p></div></div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div><div><div><div><p =
class=3DMsoNormal>Reviewer: Valery Smyslov<br>Review result: Has =
Issues<br><br>I have reviewed this document as part of the security =
directorate's ongoing<br>effort to review all IETF documents being =
processed by the IESG. &nbsp;These<br>comments were written primarily =
for the benefit of the security area directors.<br>Document editors and =
WG chairs should treat these comments just like any other<br>last call =
comments.<br><br>When I was re-assigned to review this draft the =
indicated deadline was already<br>missed by 8 months, so I don't know =
how relevant the review is. I reviewed<br>the latest -20 version of the =
draft instead of -18, that was =
requested.<o:p></o:p></p></div></div></div><div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><p =
class=3DMsoNormal>Perfect.<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal><br><br><br><o:p></o:p></p></div><div><div><div><p =
class=3DMsoNormal>The draft defines common YANG data types and groupings =
useful for cryptography.<br>I din't try to check the YANG module =
itself.<span =
class=3Dapple-converted-space>&nbsp;</span><br><br>Issues:<br><br>Shouldn=
't a Privacy Considerations section be added to the draft?<br>The draft =
defines quite a lot of privacy-sensitive information (like =
certificates)<br>with no restriction on read access (as far as I =
understand).<o:p></o:p></p></div></div></div><div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>Both the &quot;trust-anchor-cert-grouping=E2=80=9D and =
=E2=80=9Cend-entity-cert-grouping=E2=80=9D groupings =
have&nbsp;&quot;nacm:default-deny-write=E2=80=9D that, to your point, =
does not restrict reads. &nbsp;That said, only&nbsp;management protocols =
having mutual authentication (e.g., SSH and/or TLS based transport) can =
access the data. &nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;</span><o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>Is your concern that the =
certificate=E2=80=99s content would be visible to the administrators? =
&nbsp;</span>Is your comment on end-entity certificates (containing =
personally-identifying information), more than =
trust-anchor-certificates?<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#44546A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;<span class=3Dapple-converted-space>&nbsp;</span></span><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>Yes, it=E2=80=99s mostly on end-entity certificates, however there =
may be quite a lot of interesting</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; private =
information besides certificates.</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; If this =
information is only visible to the administrators and the used =
management protocols must<span =
class=3Dapple-converted-space>&nbsp;</span></span><o:p></o:p></p></div><d=
iv><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; have mutual =
authentication, then it=E2=80=99s probably not a big deal. I would have =
still added</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; a sentence =
about privacy of the stored data (i.e. that persons, that are allowed to =
access this data</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; are able to =
learn quite a lot of private information from it). I don=E2=80=99t =
insist though, it=E2=80=99s up to =
you.</span><o:p></o:p></p></div></div></div></div></div></blockquote><div=
><p class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal>I =
added the following to Section 3.8 (The &quot;ietf-crypto-types&quot; =
YANG Module).<o:p></o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;The &quot;cert-data&quot; node:<o:p></o:p></p></div><div><p =
class=3DMsoNormal style=3D'margin-bottom:12.0pt'>&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;The =
&quot;cert-data&quot; node, defined in&nbsp;both the =
&quot;trust-anchor-cert-grouping&quot;<br>&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;and =
&quot;end-entity-cert-grouping&quot;&nbsp;groupings, is additionally =
sensitive to<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;&nbsp;read operations, as certificates&nbsp;sometimes =
convey personally identifying<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;information (especially =
end-entity&nbsp;certificates).&nbsp;&nbsp;However, as it is<br>&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;&nbsp;commonly understood that certificates&nbsp;are =
&quot;public&quot;, the NACM extension<br>&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;&nbsp;&quot;nacm:default-deny-write&quot; =
(not&nbsp;&quot;default-deny-all&quot;) has been applied. It<br>&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;is =
RECOMMENDED that implementations&nbsp;adjust read-access to =
certificates<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;&nbsp;to comply with local =
policy.<o:p></o:p></p></div><div><p class=3DMsoNormal>Is this okay?<span =
lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Yes, =
thanks.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal>Separately, I thought about if there are any other =
values in the module that may have privacy concerns but was unable to =
locate any.<span lang=3DEN-US><o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0  =
certificate-signing-request?<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt'><div><div><blockquote =
style=3D'margin-top:5.0pt;margin-bottom:5.0pt'><div><div><div><p =
class=3DMsoNormal>Section 3.5.<br>While I understand and support the =
idea, expressed in this section, I think that<br>the way it is expressed =
makes it difficult to follow in practice. In general, it's<br>not always =
obvious how to estimate the &quot;strength&quot; of the underlying =
secure transport.<br>For this reason it's not clear for me how it is =
supposed to &quot;compare&quot; the<span =
class=3Dapple-converted-space>&nbsp;</span><br>&quot;strength&quot; of =
the transport with the &quot;strength&quot; of the keys being =
transported.<o:p></o:p></p></div></div></div></blockquote></div></div></d=
iv></blockquote><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div><div><div><p =
class=3DMsoNormal><span style=3D'color:black'>All comments from this =
point to the end regard the Security Consideration &quot;Strength of =
Keys Conveyed=E2=80=9D (was&nbsp;&quot;Strength of =
Keys&nbsp;Configured=E2=80=9D). &nbsp;I rewrote the section as follows. =
&nbsp;Can you please check =
for&nbsp;accuracy?<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span =
style=3D'color:black'><o:p>&nbsp;</o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'color:black'>&nbsp; &nbsp; =
&nbsp;&nbsp;Strength of Keys Conveyed<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span style=3D'color:black'><br>&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp;When accessing key values, it is =
desireable&nbsp;that implementations<br>&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;&nbsp;ensure that the strength of the keys =
being&nbsp;accessed is not greater<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;&nbsp;than the strength of the underlying secure&nbsp;transport =
connection<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;over which =
the keys are conveyed.&nbsp;&nbsp;However,&nbsp;comparing key =
strengths<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;can be =
complicated and difficult to implement&nbsp;in =
practice.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'color:black'><br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;That =
said, expert Security opinion suggests&nbsp;that already it is<br>&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;infeasible to break a 128-bit =
key using a&nbsp;classical computer, and&nbsp;</span><span lang=3DEN-US =
style=3D'color:#44546A'><o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
s/key/symmetric key/<o:p></o:p></span></p><p class=3DMsoNormal><span =
lang=3DEN-US style=3D'color:black'><br>&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;&nbsp;thus the concern for conveying higher-strength keys =
begins to lose&nbsp;<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;&nbsp;its allure.<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal style=3D'margin-bottom:12.0pt'><span lang=3DEN-US =
style=3D'color:black'><br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;&nbsp;Implementations SHOULD only use transport&nbsp;algorithms to =
those&nbsp;</span><span lang=3DEN-US =
style=3D'color:#44546A'><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 s/transport =
algorithms/secure transport/<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span lang=3DEN-US =
style=3D'color:black'>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;&nbsp;</span><span style=3D'color:black'>meeting local =
policy.&nbsp;&nbsp;A reasonable policy&nbsp;may, e.g., state =
that&nbsp;<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;only =
algorithms listed as &quot;recommended&quot; by&nbsp;the IETF be =
used.</span><span lang=3DEN-US =
style=3D'color:#44546A'><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
s\algorithms/ciphersuites/<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span lang=3DEN-US =
style=3D'color:black'><br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;&nbsp;Another reasonable policy may be to only =
use&nbsp;quantum-resistant&nbsp;<br>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp;&nbsp;algorithms.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Works for me =
with changes above. I would only add a few words at the end of the =
second para that =
<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 things may =
change in the future (e.g. if full-size quantum computers =
appear),<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 so it =
is recommended to follow up-to-date advise from crypto =
community<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 when =
protecting transport channel.<o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 I would also =
remove the last sentence in the last para, mostly =
because<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
it=E2=80=99s difficult to follow in practice (we still know not much =
about post-quantum =
crypto<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 and =
generally it=E2=80=99s not yet widely supported in protocols like TLS) =
and instead reference RFC =
7525<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 which =
contains recommendations how to use TLS in =
applications.<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
I don=E2=80=99t know in similar RFC exists for SSH, =
sorry...<br><br><o:p></o:p></span></p><p class=3DMsoNormal =
style=3D'margin-bottom:12.0pt'><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
Regards,<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
Valery.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'color:black'>Thanks!<o:p></o:p></span></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:black'>Kent, as =
author<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'color:black'><o:p>&nbsp;</o:p></span></p></div></div><p =
class=3DMsoNormal><span lang=3DEN-US><br><br><o:p></o:p></span></p><div =
style=3D'border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt'><div><div><div><div><p class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;<o:p></o:p></span></p></div></div><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>I saw language like this once in a =
DoD setting. &nbsp;I agree that it is difficult to implement in =
practice. &nbsp;</span>I used =E2=80=9CSHOULD=E2=80=9D (not MUST) to buy =
some leeway for implementations to be compliant. &nbsp;Makes =
sense?<o:p></o:p></p></div><div><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; My =
understanding of using RFC2119 language is that SHOULD is very close to =
MUST,</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; but allows =
some exceptions. So, I still think that you put a responsibility to =
make</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
security-related decisions on implementers, who often are not experts in =
this area.</span><o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;</span><o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>FWIW, my YANG-driven server is able to remember what =
key the client used for authentication (e.g., RSA 2048) and register a =
callback to test that no greater keys (e.g., 3072 or 4096) are =
configured by that client. &nbsp;Additional<span =
class=3Dapple-converted-space>&nbsp;</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; What if the =
other key configured for the client is X25519? Which is =
stronger?</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US>logic would be needed to prevent a low-strength client from =
*reading* a high-strength key configured by another =
client=E2=80=A6though the issue can be alternatively resolved by =
configuring the TLS-stack to prevent low-strength =
algorithms.</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; That was my =
point. I think that it=E2=80=99s better to require (by SHOULD) that =
only</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; those =
ciphersuites that were =E2=80=9Cvetted=E2=80=9D by IETF (i.e. got =
=E2=80=9CRecommended=E2=80=9D status) be =
used.</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; This will make =
implementers=E2=80=99 life =
easier.</span><o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal><span =
lang=3DEN-US>&nbsp;</span><o:p></o:p></p></div></div><div><div><div><p =
class=3DMsoNormal><span lang=3DEN-US>In addition, the requirement, that =
&quot;Implementations SHOULD fail the write-request if ever<br>the =
strength of the private key is greater then the strength of =
the<br>underlying transport&quot; looks wrong to me.<span =
class=3Dapple-converted-space>&nbsp;</span></span>You don't need to =
have<br>1024 bits transport protocol strength to transfer 1024 bit key, =
since<br>even for say 256 bits it's infeasible to =
break.<o:p></o:p></p></div></div></div><div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>IDK about this. &nbsp;Again, I saw this constraint =
once in a DoD setting. &nbsp;<o:p></o:p></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; My (another) =
point was that there is generally no point to =
increase</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; security =
strength beyond some level. Currently it is =
believed</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; that 128 bit =
of symmetric key is infeasible to break (provided the algorithm is not =
broken itself),</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; If you are =
lucky have full-sized Post Quantum computer, it=E2=80=99ll be 256 =
bits.</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; It=E2=80=99s =
enough to transfer symmetric keys with say 1024 bits of =
entropy</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (FWIW). So the =
requirement that the strength of transport =
must</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; be always =
greater than the strength of transported key<span =
class=3Dapple-converted-space>&nbsp;</span></span><o:p></o:p></p></div><d=
iv><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; seems not a =
good requirement to me. Instead require =
that</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the strength =
of transport be sufficient to make</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; infeasible for =
an attacker to break it.</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span =
class=3Dapple-converted-space>&nbsp;</span></span><o:p></o:p></p></div></=
div><div><div><div><p class=3DMsoNormal><span lang=3DEN-US>I think that =
the better approach would be to advise using strong<br>ciphersuites for =
transport protocols defined in corresponding RFCs.<br></span>For =
example, for TLS 1.3 there are ciphersuites marked as =
&quot;recommended&quot;,<br>that were evaluated by IETF crypto =
community.<o:p></o:p></p></div></div></div><div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>I added this =
sentence:<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal><span =
class=3Dapple-tab-span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;</span><span =
class=3Dapple-converted-space>&nbsp;</span>Implementations SHOULD =
configure&nbsp;allowed transport&nbsp;<br><span =
class=3Dapple-tab-span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;</span><span class=3Dapple-converted-space>&nbsp;</span>algorithms =
to include only&nbsp;those meeting =
local<o:p></o:p></p></div></div><div><p class=3DMsoNormal><span =
class=3Dapple-tab-span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;</span><span class=3Dapple-converted-space>&nbsp;</span>policy =
(e.g., listed as &quot;recommended&quot; by =
the&nbsp;IETF).<o:p></o:p></p></div><div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>Good?<o:p></o:p></p></div></div><div><div><p =
class=3DMsoNormal>&nbsp;<o:p></o:p></p></div></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#44546A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;<span class=3Dapple-converted-space>&nbsp;</span></span><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>Perfect</span><span lang=3DEN-US =
style=3D'color:#44546A'>.</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#44546A'>&nbsp;</span><o:p></o:p></p></div><div><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#44546A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;<span class=3Dapple-converted-space>&nbsp;</span></span><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>Regards,</span><o:p></o:p></p></div><div><p class=3DMsoNormal><span =
lang=3DEN-US =
style=3D'font-size:14.0pt;font-family:"Calibri","sans-serif";color:#44546=
A'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
Valery.</span><span =
lang=3DEN-US><br><br><br></span><o:p></o:p></p></div></div></div></div></=
div><p =
class=3DMsoNormal><o:p>&nbsp;</o:p></p></div></div></div></body></html>
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From: <mohamed.boucadair@orange.com>
To: "tm-rid@ietf.org" <tm-rid@ietf.org>, "draft-ietf-drip-rid@ietf.org" <draft-ietf-drip-rid@ietf.org>, "magnus@rsasecurity.com" <magnus@rsasecurity.com>
CC: secdir <secdir@ietf.org>
Thread-Topic: Early secdir review of draft-ietf-drip-rid-07
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Date: Tue, 31 Aug 2021 12:55:32 +0000
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Subject: [secdir] Early secdir review of draft-ietf-drip-rid-07
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Hi all,

I'm not sure the review performed by Magnus (many thanks) made it to the dr=
ip list. I'm forwarding it to the list, fwiw:
https://datatracker.ietf.org/doc/review-ietf-drip-rid-07-secdir-early-nystr=
om-2021-07-29/

I know that Bob sent a reply to the secdir mailing list, but an update abou=
t the plans to address the remaining parts of the review would be welcome.

As suggested by Magnus, a request was sent to the cfrg Chairs.

Cheers,
Med

___________________________________________________________________________=
______________________________________________

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Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
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<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">Hi all,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">I&#8217;m not sure the review performed by Magnus (many th=
anks) made it to the drip list. I&#8217;m forwarding it to the list, fwiw:
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><a href=3D"https://datatracker.ietf.org/doc/review-ietf-dr=
ip-rid-07-secdir-early-nystrom-2021-07-29/">https://datatracker.ietf.org/do=
c/review-ietf-drip-rid-07-secdir-early-nystrom-2021-07-29/</a>
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">I know that Bob sent a reply to the secdir mailing list, b=
ut an update about the plans to address the remaining parts of the review w=
ould be welcome.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">As suggested by Magnus, a request was sent to the cfrg Cha=
irs.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">Cheers,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">Med
<o:p></o:p></span></p>
</div>
<PRE>______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
</PRE></body>
</html>

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From: "Nagendra Kumar Nainar (naikumar)" <naikumar@cisco.com>
To: Tero Kivinen <kivinen@iki.fi>, "secdir@ietf.org" <secdir@ietf.org>
CC: "draft-ietf-mpls-lsp-ping-ospfv3-codepoint.all@ietf.org" <draft-ietf-mpls-lsp-ping-ospfv3-codepoint.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: Secdir last call review of draft-ietf-mpls-lsp-ping-ospfv3-codepoint-04
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Date: Tue, 31 Aug 2021 20:22:07 +0000
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Subject: Re: [secdir] Secdir last call review of draft-ietf-mpls-lsp-ping-ospfv3-codepoint-04
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Hi Tero,

Thank you for the detailed review and apologies for the very late response.=
 I was between responsibility change and took some time to change up.

Please see below for the response.


The security considerations section just says:

   This document updates [RFC8287] and does not introduce any additional
   security considerations.

And I am not completely sure if that is true, if this document really allow=
s using
IPv6 when it was not possible before. Quite often having multiple address f=
amilies do
cause new security considerations too.
<Authors> This draft only introduces the codepoint to indicate the protocol=
 is OSPFv3. What to do when the protocol is OSPFv3 is defined in RFC8287. S=
o we believe that this draft doesn=92t introduce any new semantics/actions.
Also RFC8287 refers to the RFC8029 for its
security considerations, so perhaps direct reference to RFC8029 would be ne=
eded here.
<Authors> Ok. We can clarify that in the section as below:



=93This document updates [RFC8287<https://datatracker.ietf.org/doc/html/rfc=
8287>], [RFC8029] and does not introduce any additional

   security considerations.
=93
Please let us know if the above is fine.

There are several acronyms which are not expanded on their first use (inclu=
ding
in title, and in abstract). Examples of such are IS, TLV, OSPF, IS+IS, IGP,=
 SUb-TLV (is the
spelling correct in abstract with uppercase u?),  FEC.
<Authors> =93Protocol in the Segment ID Sub-TLV=94 is the IANA registry nam=
e and I am not sure if we should try expanding it. For clarity, we will exp=
and the rest. Let us know if that solves the concern.

The use of just RFC numbers in reference format makes the document hard to =
read
as not everybody remembers what RFC is RFC number 8287, 8402 etc. It would =
be
much nicer to at least on the first time use the format where the text refe=
rs to RFC
with title or similar and just has the reference in parenthesis, i.e.:

   RFC5340 "OSPF for IPv6" ([RFC5340]) describes OSPF version 3 (OSPFv3) to
   support IPv6. RFC5838 "Support of Address Families in OSPFv3" ([RFC5838]=
)
   describes the mechanism to support multiple address families (AFs) in OS=
PFv3.
   Accordingly, OSPFv3 may be used to advertise IPv6 and IPv4 prefixes.


is easier for reader than current format:

   [RFC5340] describes OSPF version 3 (OSPFv3) to support IPv6.
   [RFC5838] describes the mechanism to support multiple address
   families (AFs) in OSPFv3. Accordingly, OSPFv3 may be used to
   advertise IPv6 and IPv4 prefixes.


<Authors> The use of RFC number alone as the reference is a common use AFAI=
K and we feel that it is not specific to this document. But we don=92t want=
 that to be a hurdle to move this document forward and if the consensus is =
to include the RFC document name, we are ok.

Or, as the rfc title tells what the RFC is about you do not need to explain=
 it that much
you can simply say:

   RFC5340 "OSPF for IPv6" ([RFC5340]) describes OSPF version 3 (OSPFv3) an=
d
   RFC5838 "Support of Address Families in OSPFv3" ([RFC5838])
   describes how OSPFv3 may be used to advertise IPv6 and IPv4 prefixes.

Also someone who is not at all familiar with this it is bit hard to know wh=
at are
Type 34, 35, and 36 in Segment Id Sub-TLV registry.


<Authors> Ok. We will expand the same.

As a personal note, I have never liked to just use the reference inside tex=
t
(for example "This document updates [RFC8287] ...") as in case the RFC
rendering engine decides to render references in some other way than just
text with [] around it, the text might get unreadable (For example it repla=
ces the
text inside [] with number or footnote or similar). Thats why I myself usua=
lly
want to write those either as "This document updates RFC8287 ([RFC8287])...=
" or
even "This document updates RFC8287..." as RFC8287 is referenced so many ti=
mes
in the document that there is no need to make each instance a reference. Bu=
t this
is just my personal view, and authors might have different views...


<Authors> Thank you for the comment. We will leave it as it is for now and =
if others believe it needs to be changed, we can look into it.
Once again, thanks a lot for the great comments.
Regards,
Nagendra (on behalf of the authors)





From: Tero Kivinen via Datatracker <noreply@ietf.org>
Date: Thursday, June 10, 2021 at 10:20 AM
To: secdir@ietf.org <secdir@ietf.org>
Cc: draft-ietf-mpls-lsp-ping-ospfv3-codepoint.all@ietf.org <draft-ietf-mpls=
-lsp-ping-ospfv3-codepoint.all@ietf.org>, last-call@ietf.org <last-call@iet=
f.org>, mpls@ietf.org <mpls@ietf.org>
Subject: Secdir last call review of draft-ietf-mpls-lsp-ping-ospfv3-codepoi=
nt-04
Reviewer: Tero Kivinen
Review result: Has Nits

I have reviewed this document as part of the security directorate's
ongoing effort to review all IETF documents being processed by the
IESG.  These comments were written primarily for the benefit of the
security area directors.  Document editors and WG chairs should treat
these comments just like any other last call comments.

This document allocates a code point for OSPFv3 for MPLS LSP Ping and
updates previous allocation to only cover OSPFv2. It also defines
behavior when using IPv6 with OSPv3.

This document is quite short but hard to ready because of heavy use of acro=
nyms
and just referencing code points with numbers and same with RFCs.

The security considerations section just says:

   This document updates [RFC8287] and does not introduce any additional
   security considerations.

And I am not completely sure if that is true, if this document really allow=
s using
IPv6 when it was not possible before. Quite often having multiple address f=
amilies do
cause new security considerations too. Also RFC8287 refers to the RFC8029 f=
or its
security considerations, so perhaps direct reference to RFC8029 would be ne=
eded here.

There are several acronyms which are not expanded on their first use (inclu=
ding
in title, and in abstract). Examples of such are IS, TLV, OSPF, IS+IS, IGP,=
 SUb-TLV (is the
spelling correct in abstract with uppercase u?),  FEC.

The use of just RFC numbers in reference format makes the document hard to =
read
as not everybody remembers what RFC is RFC number 8287, 8402 etc. It would =
be
much nicer to at least on the first time use the format where the text refe=
rs to RFC
with title or similar and just has the reference in parenthesis, i.e.:

   RFC5340 "OSPF for IPv6" ([RFC5340]) describes OSPF version 3 (OSPFv3) to
   support IPv6. RFC5838 "Support of Address Families in OSPFv3" ([RFC5838]=
)
   describes the mechanism to support multiple address families (AFs) in OS=
PFv3.
   Accordingly, OSPFv3 may be used to advertise IPv6 and IPv4 prefixes.


is easier for reader than current format:

   [RFC5340] describes OSPF version 3 (OSPFv3) to support IPv6.
   [RFC5838] describes the mechanism to support multiple address
   families (AFs) in OSPFv3. Accordingly, OSPFv3 may be used to
   advertise IPv6 and IPv4 prefixes.

Or, as the rfc title tells what the RFC is about you do not need to explain=
 it that much
you can simply say:

   RFC5340 "OSPF for IPv6" ([RFC5340]) describes OSPF version 3 (OSPFv3) an=
d
   RFC5838 "Support of Address Families in OSPFv3" ([RFC5838])
   describes how OSPFv3 may be used to advertise IPv6 and IPv4 prefixes.

Also someone who is not at all familiar with this it is bit hard to know wh=
at are
Type 34, 35, and 36 in Segment Id Sub-TLV registry.

As a personal note, I have never liked to just use the reference inside tex=
t
(for example "This document updates [RFC8287] ...") as in case the RFC
rendering engine decides to render references in some other way than just
text with [] around it, the text might get unreadable (For example it repla=
ces the
text inside [] with number or footnote or similar). Thats why I myself usua=
lly
want to write those either as "This document updates RFC8287 ([RFC8287])...=
" or
even "This document updates RFC8287..." as RFC8287 is referenced so many ti=
mes
in the document that there is no need to make each instance a reference. Bu=
t this
is just my personal view, and authors might have different views...



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<p class=3D"MsoNormal"><span style=3D"color:black">Hi Tero,</span><span sty=
le=3D"color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">Thank you for the detail=
ed review and apologies for the very late response. I was between responsib=
ility change and took some time to change up.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">Please see below for the=
 response.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black"><br>
The security considerations section just says:<br>
<br>
&nbsp;&nbsp; This document updates [RFC8287] and does not introduce any add=
itional<br>
&nbsp;&nbsp; security considerations.<br>
<br>
And I am not completely sure if that is true, if this document really allow=
s using<br>
IPv6 when it was not possible before. Quite often having multiple address f=
amilies do<span class=3D"apple-converted-space">&nbsp;</span><br>
cause new security considerations too.<span class=3D"apple-converted-space"=
>&nbsp;</span><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black">&lt;Authors&gt; This draft only introduces the codepoint to indicate=
 the protocol is OSPFv3. What to do when the protocol is OSPFv3 is defined =
in RFC8287. So we believe that this draft doesn=92t
 introduce any new semantics/actions.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black">Also RFC8287 refers to the RFC8029 for its<br>
security considerations, so perhaps direct reference to RFC8029 would be ne=
eded here.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black">&lt;Authors&gt; Ok. We can clarify that in the section as below:<br>
<br>
<br>
<o:p></o:p></span></p>
<pre><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:black"=
>=93</span><span style=3D"color:black">This document updates [<a href=3D"ht=
tps://datatracker.ietf.org/doc/html/rfc8287" title=3D"&quot;Label Switched =
Path (LSP) Ping/Traceroute for Segment Routing (SR) IGP-Prefix and IGP-Adja=
cency Segment Identifiers (SIDs) with MPLS Data Planes&quot;"><span style=
=3D"color:#0563C1">RFC8287</span></a>], [RFC8029] and does not introduce an=
y additional<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; security considerations.<o:p>=
</o:p></span></pre>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black">=93<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black">Please let us know if the above is fine.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black"><br>
There are several acronyms which are not expanded on their first use (inclu=
ding<br>
in title, and in abstract). Examples of such are IS, TLV, OSPF, IS+IS, IGP,=
 SUb-TLV (is the<span class=3D"apple-converted-space">&nbsp;</span><br>
spelling correct in abstract with uppercase u?),&nbsp; FEC.<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black">&lt;Authors&gt; =93Protocol in the Segment ID Sub-TLV=94 is the IANA=
 registry name and I am not sure if we should try expanding it. For clarity=
, we will expand the rest. Let us know if that solves
 the concern.<br>
<br>
The use of just RFC numbers in reference format makes the document hard to =
read<br>
as not everybody remembers what RFC is RFC number 8287, 8402 etc. It would =
be<span class=3D"apple-converted-space">&nbsp;</span><br>
much nicer to at least on the first time use the format where the text refe=
rs to RFC<br>
with title or similar and just has the reference in parenthesis, i.e.:<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black"><br>
&nbsp;&nbsp; RFC5340 &quot;OSPF for IPv6&quot; ([RFC5340]) describes OSPF v=
ersion 3 (OSPFv3) to<span class=3D"apple-converted-space">&nbsp;</span><br>
&nbsp;&nbsp; support IPv6. RFC5838 &quot;Support of Address Families in OSP=
Fv3&quot; ([RFC5838])<br>
&nbsp;&nbsp; describes the mechanism to support multiple address families (=
AFs) in OSPFv3.<br>
&nbsp;&nbsp; Accordingly, OSPFv3 may be used to advertise IPv6 and IPv4 pre=
fixes.<br>
<br>
<br>
is easier for reader than current format:<br>
<br>
&nbsp;&nbsp; [RFC5340] describes OSPF version 3 (OSPFv3) to support IPv6.<b=
r>
&nbsp;&nbsp; [RFC5838] describes the mechanism to support multiple address<=
br>
&nbsp;&nbsp; families (AFs) in OSPFv3. Accordingly, OSPFv3 may be used to<b=
r>
&nbsp;&nbsp; advertise IPv6 and IPv4 prefixes.<br>
<br>
<br>
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black">&lt;Authors&gt; The use of RFC number alone as the reference is a co=
mmon use AFAIK and we feel that it is not specific to this document. But we=
 don=92t want that to be a hurdle to move this
 document forward and if the consensus is to include the RFC document name,=
 we are ok.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black"><br>
Or, as the rfc title tells what the RFC is about you do not need to explain=
 it that much<br>
you can simply say:<br>
<br>
&nbsp;&nbsp; RFC5340 &quot;OSPF for IPv6&quot; ([RFC5340]) describes OSPF v=
ersion 3 (OSPFv3) and<br>
&nbsp;&nbsp; RFC5838 &quot;Support of Address Families in OSPFv3&quot; ([RF=
C5838])<br>
&nbsp;&nbsp; describes how OSPFv3 may be used to advertise IPv6 and IPv4 pr=
efixes.<br>
<br>
Also someone who is not at all familiar with this it is bit hard to know wh=
at are<br>
Type 34, 35, and 36 in Segment Id Sub-TLV registry.<span class=3D"apple-con=
verted-space">&nbsp;</span><br>
<br>
<br>
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black">&lt;Authors&gt; Ok. We will expand the same.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black"><br>
As a personal note, I have never liked to just use the reference inside tex=
t<br>
(for example &quot;This document updates [RFC8287] ...&quot;) as in case th=
e RFC<span class=3D"apple-converted-space">&nbsp;</span><br>
rendering engine decides to render references in some other way than just<s=
pan class=3D"apple-converted-space">&nbsp;</span><br>
text with [] around it, the text might get unreadable (For example it repla=
ces the<br>
text inside []&nbsp;with number or footnote or similar). Thats why I myself=
 usually<br>
want to write those either as &quot;This document updates RFC8287 ([RFC8287=
])...&quot; or<span class=3D"apple-converted-space">&nbsp;</span><br>
even &quot;This document updates RFC8287...&quot; as RFC8287 is referenced =
so many times<br>
in the document that there is no need to make each instance a reference. Bu=
t this<br>
is just my personal view, and authors might have different views...<br>
<br>
<br>
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black">&lt;Authors&gt; Thank you for the comment. We will leave it as it is=
 for now and if others believe it needs to be changed, we can look into it.=
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black">Once again, thanks a lot for the great comments.<o:p></o:p></span></=
p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><span style=3D"color:=
black">Nagendra (on behalf of the authors)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black">&nbsp;<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><b><span style=3D"fon=
t-size:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">Tero Kivinen via Da=
tatracker &lt;noreply@ietf.org&gt;<br>
<b>Date: </b>Thursday, June 10, 2021 at 10:20 AM<br>
<b>To: </b>secdir@ietf.org &lt;secdir@ietf.org&gt;<br>
<b>Cc: </b>draft-ietf-mpls-lsp-ping-ospfv3-codepoint.all@ietf.org &lt;draft=
-ietf-mpls-lsp-ping-ospfv3-codepoint.all@ietf.org&gt;, last-call@ietf.org &=
lt;last-call@ietf.org&gt;, mpls@ietf.org &lt;mpls@ietf.org&gt;<br>
<b>Subject: </b>Secdir last call review of draft-ietf-mpls-lsp-ping-ospfv3-=
codepoint-04<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">Reviewer: Tero Kivine=
n<br>
Review result: Has Nits<br>
<br>
I have reviewed this document as part of the security directorate's <br>
ongoing effort to review all IETF documents being processed by the <br>
IESG.&nbsp; These comments were written primarily for the benefit of the <b=
r>
security area directors.&nbsp; Document editors and WG chairs should treat =
<br>
these comments just like any other last call comments.<br>
<br>
This document allocates a code point for OSPFv3 for MPLS LSP Ping and <br>
updates previous allocation to only cover OSPFv2. It also defines<br>
behavior when using IPv6 with OSPv3.<br>
<br>
This document is quite short but hard to ready because of heavy use of acro=
nyms<br>
and just referencing code points with numbers and same with RFCs.<br>
<br>
The security considerations section just says:<br>
<br>
&nbsp;&nbsp; This document updates [RFC8287] and does not introduce any add=
itional<br>
&nbsp;&nbsp; security considerations.<br>
<br>
And I am not completely sure if that is true, if this document really allow=
s using<br>
IPv6 when it was not possible before. Quite often having multiple address f=
amilies do
<br>
cause new security considerations too. Also RFC8287 refers to the RFC8029 f=
or its<br>
security considerations, so perhaps direct reference to RFC8029 would be ne=
eded here.<br>
<br>
There are several acronyms which are not expanded on their first use (inclu=
ding<br>
in title, and in abstract). Examples of such are IS, TLV, OSPF, IS+IS, IGP,=
 SUb-TLV (is the
<br>
spelling correct in abstract with uppercase u?),&nbsp; FEC.<br>
<br>
The use of just RFC numbers in reference format makes the document hard to =
read<br>
as not everybody remembers what RFC is RFC number 8287, 8402 etc. It would =
be <br>
much nicer to at least on the first time use the format where the text refe=
rs to RFC<br>
with title or similar and just has the reference in parenthesis, i.e.:<br>
<br>
&nbsp;&nbsp; RFC5340 &quot;OSPF for IPv6&quot; ([RFC5340]) describes OSPF v=
ersion 3 (OSPFv3) to <br>
&nbsp;&nbsp; support IPv6. RFC5838 &quot;Support of Address Families in OSP=
Fv3&quot; ([RFC5838])<br>
&nbsp;&nbsp; describes the mechanism to support multiple address families (=
AFs) in OSPFv3.<br>
&nbsp;&nbsp; Accordingly, OSPFv3 may be used to advertise IPv6 and IPv4 pre=
fixes.<br>
<br>
<br>
is easier for reader than current format:<br>
<br>
&nbsp;&nbsp; [RFC5340] describes OSPF version 3 (OSPFv3) to support IPv6.<b=
r>
&nbsp;&nbsp; [RFC5838] describes the mechanism to support multiple address<=
br>
&nbsp;&nbsp; families (AFs) in OSPFv3. Accordingly, OSPFv3 may be used to<b=
r>
&nbsp;&nbsp; advertise IPv6 and IPv4 prefixes.<br>
<br>
Or, as the rfc title tells what the RFC is about you do not need to explain=
 it that much<br>
you can simply say:<br>
<br>
&nbsp;&nbsp; RFC5340 &quot;OSPF for IPv6&quot; ([RFC5340]) describes OSPF v=
ersion 3 (OSPFv3) and<br>
&nbsp;&nbsp; RFC5838 &quot;Support of Address Families in OSPFv3&quot; ([RF=
C5838])<br>
&nbsp;&nbsp; describes how OSPFv3 may be used to advertise IPv6 and IPv4 pr=
efixes.<br>
<br>
Also someone who is not at all familiar with this it is bit hard to know wh=
at are<br>
Type 34, 35, and 36 in Segment Id Sub-TLV registry. <br>
<br>
As a personal note, I have never liked to just use the reference inside tex=
t<br>
(for example &quot;This document updates [RFC8287] ...&quot;) as in case th=
e RFC <br>
rendering engine decides to render references in some other way than just <=
br>
text with [] around it, the text might get unreadable (For example it repla=
ces the<br>
text inside []&nbsp;with number or footnote or similar). Thats why I myself=
 usually<br>
want to write those either as &quot;This document updates RFC8287 ([RFC8287=
])...&quot; or <br>
even &quot;This document updates RFC8287...&quot; as RFC8287 is referenced =
so many times<br>
in the document that there is no need to make each instance a reference. Bu=
t this<br>
is just my personal view, and authors might have different views...<br>
<br>
<br>
<o:p></o:p></p>
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