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From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Mon Aug  2 09:19:50 2004
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From: pgut001@cs.auckland.ac.nz (Peter Gutmann)
To: galb-list@vandyke.com, pgut001@cs.auckland.ac.nz
Subject: Re: Invalid channel numbers
Cc: ietf-ssh@NetBSD.org, mouse@Rodents.Montreal.QC.CA
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Joseph Galbraith <galb-list@vandyke.com> writes:

>The channel number is part of the packet that is predefined. Therefore, you
>can always parse the channel number, and send the response.

What if it's a channel open where the packet ends halfway through the channel
number?  You've got a request, there seems to be a requirement to send a
response, but you can't respond without some facility that lets you say "The
last channel-related request was disallowed".

Peter.


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Mon Aug  2 09:51:53 2004
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To: Peter Gutmann <pgut001@cs.auckland.ac.nz>
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Hi,

Peter Gutmann wrote:

> Joseph Galbraith <galb-list@vandyke.com> writes:
> 
> 
>>The channel number is part of the packet that is predefined. Therefore, you
>>can always parse the channel number, and send the response.
> 
> 
> What if it's a channel open where the packet ends halfway through the channel
> number?  You've got a request, there seems to be a requirement to send a
> response, but you can't respond without some facility that lets you say "The
> last channel-related request was disallowed".

This seems broken enough to just close the connection - it's not in 
accordance with the current spec, or any future possible altered spec. 
If you're really eager not to close the connection, sending an 
SSH_MSG_UNIMPLEMENTED might be a reasonable alternative.

-- 
Jon Bright
Silicon Circus Ltd.
http://www.siliconcircus.com


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Mon Aug  2 10:08:01 2004
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From: Markus Friedl <markus@openbsd.org>
To: Peter Gutmann <pgut001@cs.auckland.ac.nz>
Cc: galb-list@vandyke.com, ietf-ssh@NetBSD.org, mouse@Rodents.Montreal.QC.CA
Subject: Re: Invalid channel numbers
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On Tue, Aug 03, 2004 at 01:19:49AM +1200, Peter Gutmann wrote:
> Joseph Galbraith <galb-list@vandyke.com> writes:
> 
> >The channel number is part of the packet that is predefined. Therefore, you
> >can always parse the channel number, and send the response.
> 
> What if it's a channel open where the packet ends halfway through the channel
> number?

if you get a completely corrupt message, why not send a SSH_DISCONNECT_PROTOCOL_ERROR?


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Mon Aug  2 10:19:50 2004
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From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Mon Aug  2 10:39:35 2004
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From: pgut001@cs.auckland.ac.nz (Peter Gutmann)
To: jon@siliconcircus.com, pgut001@cs.auckland.ac.nz
Subject: Re: Invalid channel numbers
Cc: galb-list@vandyke.com, ietf-ssh@NetBSD.org, mouse@Rodents.Montreal.QC.CA
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Jon Bright <jon@siliconcircus.com> writes:

>If you're really eager not to close the connection, sending an
>SSH_MSG_UNIMPLEMENTED might be a reasonable alternative.

Yeah, I guess that would do.  The reason why I'd prefer not to close the
connection outright is that there might he half a dozen data transfers
currently in progress, and I'd prefer not to abort them all just because of
one malformed packet on an unrelated channel.

Peter.


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Mon Aug  2 11:01:32 2004
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From: Simon Tatham <anakin@pobox.com>
To: ietf-ssh@NetBSD.org
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Subject: Re: Invalid channel numbers
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Peter Gutmann <pgut001@cs.auckland.ac.nz> wrote:
> Yeah, I guess that would do.  The reason why I'd prefer not to close the
> connection outright is that there might he half a dozen data transfers
> currently in progress, and I'd prefer not to abort them all just because of
> one malformed packet on an unrelated channel.

The question is, though, why would you _get_ such a malformed
packet? The SSH data channel is required to be free of corruption
and data loss (and the MACs enforce this vigorously), so it's not as
if half of an SSH message is going to routinely disappear en route.
The only way it can happen is as a result of a pretty fundamental
bug in the SSH implementation at the far end.

Therefore, it isn't unreasonable to assume that an SSH
implementation which has sent you a packet that badly formed is in a
state of total internal confusion, and to terminate the connection
before it sends you any more plausible rubbish that you might
accidentally trust!

I can't imagine any situation in which this sort of error condition
would occur routinely, such that it would make sense to spend effort
on salvaging everything possible from the rest of the SSH
connection. It really ought to only ever occur when the client or
server is in development, in which case you weren't transferring any
important data through it anyway.
-- 
Simon Tatham         What do we want?        ROT13!
<anakin@pobox.com>   When do we want it?     ABJ!


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Mon Aug  2 14:19:46 2004
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From: Bill Sommerfeld <sommerfeld@east.sun.com>
To: pgut001@cs.auckland.ac.nz (Peter Gutmann)
cc: galb-list@vandyke.com, ietf-ssh@NetBSD.org, mouse@Rodents.Montreal.QC.CA
Subject: Re: Invalid channel numbers 
In-Reply-To: Your message of "Tue, 03 Aug 2004 01:19:49 +1200."
             <E1BrcjF-0001tI-0y@medusa01> 
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> What if it's a channel open where the packet ends halfway through the channel
> number?  You've got a request, there seems to be a requirement to send a
> response, but you can't respond without some facility that lets you say "The
> last channel-related request was disallowed".

so, my sense is that there will always be a level of peer-brokenness
for which the only possible recovery is for the implementation to
throw up its virtual hands and give up.  This bit of the protocol runs
on top of an integrity-protected channel; a parse error either
indicates a buggy peer, buggy integrity protection, or a bug in your
own implementation, and distinguishing these cases is hard.

exactly how hard you try to keep going before that is something of a
quality-of-implementation issue.  dropping the connection seems like an
entirely reasonable response..

					- Bill




From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Mon Aug  2 14:29:45 2004
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From: Markus Friedl <markus@openbsd.org>
To: Simon Tatham <anakin@pobox.com>
Cc: ietf-ssh@NetBSD.org
Subject: Re: Invalid channel numbers
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On Mon, Aug 02, 2004 at 03:44:18PM +0100, Simon Tatham wrote:
> Peter Gutmann <pgut001@cs.auckland.ac.nz> wrote:
> > Yeah, I guess that would do.  The reason why I'd prefer not to close the
> > connection outright is that there might he half a dozen data transfers
> > currently in progress, and I'd prefer not to abort them all just because of
> > one malformed packet on an unrelated channel.
> 
> The question is, though, why would you _get_ such a malformed
> packet? The SSH data channel is required to be free of corruption
> and data loss (and the MACs enforce this vigorously), so it's not as
> if half of an SSH message is going to routinely disappear en route.
> The only way it can happen is as a result of a pretty fundamental
> bug in the SSH implementation at the far end.
> 
> Therefore, it isn't unreasonable to assume that an SSH
> implementation which has sent you a packet that badly formed is in a
> state of total internal confusion, and to terminate the connection
> before it sends you any more plausible rubbish that you might
> accidentally trust!

i can only agree with you, and this is why i'd prefer
SSH_DISCONNECT_PROTOCOL_ERROR.


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Wed Aug  4 07:37:22 2004
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Hi,

I was hoping that this was a closed issue but I believe that Tero knows
something about this subject.  Can we have some discussion on this?  I'd
like to try to come to some consensus around one of the following:

- Tero knows of what he is saying and we need to adjust our wording.
<Extra points will be awarded for a wording proposal.>

- Tero knows of what he is saying but what we now have is good enough for
our purposes.

- "And now for something entirely different..."

Thanks,
Chris

---------- Forwarded message ----------
Date: Wed, 4 Aug 2004 01:28:35 +0300 (EEST)
From: Tero Kivinen
To: Chris Lonvick <clonvick@cisco.com>
Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal

[I am not normally following secsh list, I am just reading last few
hundred emails, because I am bored in the PMTUD meeting, and I am
going through all ietf mailing list, so I do not send this directly to
the list (probably wouldn't go through because of spam filters), you
can forward this to the list if you feel like so. I will not be
reading the list again in near future, so I will not see any replies
to my email in few months...]


Chris Lonvick <clonvick@cisco.com> writes:
>      diffie-hellman-group1-sha1       REQUIRED
>      diffie-hellman-group14-sha1      REQUIRED

I think the group14 is very misleading. The number 14 is from the IANA
number allocated for the IKE to the "2048-bit MODP group" of the RFC
3526. (http://www.iana.org/assignments/ipsec-registry). The next
revision of the RFC 3526 might not have the numbers at all, or the
numbers might be different. Also IPsec WG might decide to change the
numbers if they want to do it.

It would be same as renaming the 3des-cbc with cipher5 etc...

>    Additional methods may be defined as specified in [SSH-NUMBERS].
>    Note that, for historical reasons, the name
>    "diffie-hellman-group1-sha1" is used for a key exchange method
>    using
>    Oakley Group 2. This is considered an aberration and should not
>    be

It happens to use the same group that is also used in the IPsec and
there it has been allocated number 2 from the IANA... There is no
reason why secsh should use the IPsec IANA registry for the numbers.

>    repeated. Any future specifications of Diffie Hellman key
>    exchange
>    using Oakley groups defined in [RFC2412] or its successors should
>    be
>    named using the group numbers assigned by IANA, and names of the
>    form
>    "diffie-hellman-groupN-sha1" should be reserved for this purpose.

Note, that group 14 is NOT oakley group. It is not defined in the
RFC2412, and the RFC 3526 does not use name oakley group anywhere. The
IANA registry for IKE (ipsec-registry) allocates the numbers for those
groups.

> 8.2 diffie-hellman-group14-sha1
>
>    The "diffie-hellman-group14-sha1" method specifies Diffie-Hellman
>    key
>    exchange with SHA-1 as HASH, and Oakley Group 14 [RFC3526]
>    (2048bit
>    MODP Group), and it MUST also be supported.

Oakley group 14 is very misleading and plainly wrong. Any groups
defined in the RFC3526 are not oakley groups. They do not have
anything to do with the oakley document.

The "2048-bit MODP group" group defined in the RFC3526 has been
allocated number 14 in the IPsec/IKE registry, but secsh should be
using their own registries, not to share the IKE registry. Note, that
IKEv2 will have its own registry for the groups, and that registry
might not be kept sync with the IKEv1 registry of groups.

> Please send back your comments to this proposal.

--


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Wed Aug  4 13:15:00 2004
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Date: Wed, 4 Aug 2004 09:58:50 -0700 (PDT)
From: Chris Lonvick <clonvick@cisco.com>
To: ietf-ssh@NetBSD.org
Subject: Re: Transport messages during kex
In-Reply-To: <20040723132334.GA21109@chiark.greenend.org.uk>
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Hi Everyone,

Is everyone OK with the following proposal?
- Integrate Jacob's replacement Section 7.1 from below.
- Integrate Jacob's text in other parts of the document as noted in
http://www.chiark.greenend.org.uk/~jacobn/2004/07/ssh2-kex-data-diff.html

If I don't hear objections, then I'll incorporate those changes into
[TRANS].

Thanks,
Chris

On Fri, 23 Jul 2004, Jacob Nevins wrote:

> Jeffrey Hutzelman writes:
>
> > On Wednesday, July 21, 2004 12:26:06 +0100 Jacob Nevins
> > <jacobn+secsh@chiark.greenend.org.uk> wrote:
> >
> > > Jeffrey Hutzelman writes:
> > >> And what's wrong with other (not yet defined) messages in the 20-29
> > >> range? Without these, it will become difficult to extend algorithm
> > >> negotiation, which I know we've discussed in the past.
> > >
> > > In principle yes, but at this point I'd be inclined to defer resolving
> > > this to such time as such extensions are actually defined.
> >
> > That doesn't help.  The issue is that in order to extend the exchange in
> > the future, an new peer needs to be able to send a not-yet-defined message
> > to an old peer and get SSH_MSG_UNIMPLEMENTED back.  In order for that to
> > work, old peers must accept the not-yet-defined message and return
> > SSH_MSG_UNIMPLEMENTED, rather than ignoring the not-yet-defined message or
> > deciding to disconnect (either of which would appear to be OK -- we don't
> > define what happens if you get a message that you MUST NOT accept).
>   [snip other explanation]
>
> OK, you've convinced me. How does the following replacement Section 7.1
> paragraph for my proposal sound?:
>
>    Once a party has sent a KEXINIT message for key exchange or
>    re-exchange, until is has sent a NEWKEYS message (Section 7.3), it
>    MUST NOT send any messages other than:
>    o  Transport layer generic messages (1 to 19) (but SERVICE_REQUEST
>       and SERVICE_ACCEPT MUST NOT be sent);
>    o  Algorithm negotiation messages (20 to 29) (but further KEXINITs
>       MUST NOT be sent);
>    o  Key exchange method specific messages (30 to 49).
>    The provisions of Section 11 apply for unrecognised messages, etc.
>
> (the rest of my proposal is unchanged; see it in full at
> <http://www.chiark.greenend.org.uk/ucgi/~jacobn/cvsweb/ssh2-kex-data.d/draft-ietf-secsh-transport-18-plus-kex-data.txt.diff?r1=1.1&r2=1.4&f=H>
> or <http://tinyurl.com/4hdge>
>
> To attempt to address Derek Fawcus' comments elsewhere: I don't believe
> this precludes the future implementation of a non-blocking rekey
> extension. (I'd have thought the obvious way to do that would be to
> substitute a new KEXINIT_NONBLOCK in the 20-29 range for the KEXINIT
> used for a re-exchange.) I don't think there's a need to leave responses
> to any messages formally unspecified given the UNIMPLEMENTED mechanism.
>


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug  5 07:47:00 2004
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References: <Pine.HPX.4.58.0408040930090.13542@edison.cisco.com>
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Chris Lonvick wrote:
> Hi,
> 
> I was hoping that this was a closed issue but I believe that Tero knows
> something about this subject.  Can we have some discussion on this?  I'd
> like to try to come to some consensus around one of the following:

I think that we should just change the drafts to read "RFC3526 group 14"
instead of "oakley group 14". The RFC isn't going to change
retrospectively and it seems like total overkill to set up an IANA
registry for a couple of groups, especially if DHGEX is going to be
preferred in the future.

-d


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug  5 13:23:10 2004
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From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Tue Aug 10 05:01:27 2004
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In order to be at the top of the list with a search engine, you need to qualify with them.
Our company qualifies for Google, Yahoo!, MSN, and several other companies.
If you'd like to see if your website qualifies for a better position, reply with your contact info
and web address. Usual response will come in a couple days after review.

Sincerely,

Janet Sabatino
Website Positioning Services
37 Business Center Dr.
Austin, TX


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Fri Aug 13 09:12:08 2004
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Date: Fri, 13 Aug 2004 14:09:51 +0100
From: Anil Madhavapeddy <anil@recoil.org>
To: ietf-ssh@NetBSD.org
Subject: query about draft-ietf-secsh-connect-19.txt
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In draft-ietf-secsh-connect-19.txt, Section 7.1, there is a reference
to:

byte     SSH_MSG_GLOBAL_REQUEST_SUCCESS
uint32   port that was bound on the server

which should probably be "SSH_MSG_REQUEST_SUCCESS"

The other odd thing about this packet is that it's the only one which 
doesn't encode the request type in which it's in response to.

This form would appear to make more sense:

byte    SSH_MSG_REQUEST_SUCCESS
string  "tcpip-forward"
uint32  port that was bound on the server

As this is the only packet for which the contents of the packet can
vary without a "constant field" on which to make the decision of which
further packets to inspect.  In other cases, e.g. SSH_MSG_CHANNEL_REQUEST,
the decision to decode further fields can be taken by lookinng at the
first string argument.

-- 
Anil Madhavapeddy                                 http://anil.recoil.org
University of Cambridge                          http://www.cl.cam.ac.uk


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Mon Aug 16 00:27:24 2004
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Mais Emails, venda online de listas de email, fazemos mala direta e 
propaganda de sua empresa ou negócio para milhões de emails. Temos listas 
de email Mala Direta, Mala-Direta, Cadastro de Emails, Lista de Emails, 
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Segmentados, Emails em Massa, E-mails

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Temos listas de email Mala Direta, Mala-Direta, Cadastro de Emails, Lista 
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From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 19 16:35:26 2004
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To: sommerfeld@east.sun.com
Cc: Jon Bright <jon@siliconcircus.com>,
        Peter Gutmann <pgut001@cs.auckland.ac.nz>, ietf-ssh@NetBSD.org
Subject: Re: Invalid channel numbers
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From: nisse@lysator.liu.se (=?iso-8859-1?q?Niels_M=F6ller?=)
Date: 19 Aug 2004 16:59:12 +0200
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Bill Sommerfeld <sommerfeld@east.sun.com> writes:

> (In any event, you likely need more than just a channel number to track
> peer channel state, so a valid bit or state variable doesn't seem like
> such a big deal.  no reason to change the protocol..)

I use a channel table indexed by local channel number. I choose to use
small non-negative integers for my local numbers, and -1 as a flag
value in a few places. The remote channel number is a totally opaque
identifier stored in this table together with the other channel state.

This seems like a natural way to organize the channel table. I can not
remember that I have ever wanted or needed a reserved flag value in
the remote number space.

Regards,
/Niels


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Subject: Re: Invalid channel numbers
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Date: 19 Aug 2004 16:48:34 +0200
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pgut001@cs.auckland.ac.nz (Peter Gutmann) writes:

> What if it's a channel open where the packet ends halfway through the channel
> number?  You've got a request, there seems to be a requirement to send a
> response, but you can't respond without some facility that lets you say "The
> last channel-related request was disallowed".

I don't see any problem here. Whenever you receive a packet that
clearly doesn't follow the spec, just reply with SSH_MSG_DISCONNECT,
SSH_DISCONNECT_PROTOCOL_ERROR, then hang up the connection. Truncated
channel requests are in this class.

If you *really* want to be more forgiving than that, send a
SSH_MSG_DEBUG explaining the problem, and then ignore the packet. But
such behaviour goes beyond the specification. My reading of the spec
is that SSH_MSG_DISCONNECT is the only appropriate response in this
case.

Regards,
/Niels


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To: Damien Miller <djm@mindrot.org>
Cc: Chris Lonvick <clonvick@cisco.com>, ietf-ssh@NetBSD.org
Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd)
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	<411216B5.5080308@mindrot.org>
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From: nisse@lysator.liu.se (=?iso-8859-1?q?Niels_M=F6ller?=)
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Damien Miller <djm@mindrot.org> writes:

> I think that we should just change the drafts to read "RFC3526 group 14"
> instead of "oakley group 14". The RFC isn't going to change
> retrospectively and it seems like total overkill to set up an IANA
> registry for a couple of groups, especially if DHGEX is going to be
> preferred in the future.

I'm sorry if I haven't been following the group closely enough
recently, but now I'm confused. I thought the entire purpose of the
secsh-numbers document was to specify an IANA registry for ssh-related
names and numbers. The creation of that new registry seems totally
orthogonal to whether or not we try to keep some of the numbers in the
registry somehow in "sync" with the ipsec iana registry.

As for the appropriateness of the name "oakley group 14" for our
group, I have been assuming that the group, and the name "group 14",
originates in some paper (outside of the RFC series), together with
some motivation and analysis of the method by which the primes were
selected. I would have expected a reference to such a paper in RFC
2412 and RFC 3526, but I can't seem to find any.

If that's not the case, I'd have to agree with Tero that it doesn't
make much sense to copy arbitrary numbers from the ipsec iana registry
into our registry.

Can any onebody shed some light on the origins of the "oakley groups"
and their names?

Confusedly yours,
/Niels

PS. And also "RFC3526 group 14" doesn't make much sense to me; the
motivation for the "group14" naming we've been discussing have been to
make it *easily* generalizable to new groups that appear in some well
defined (by somebody else) series. Doing that, and then referring to a
fix document like RFC3526 defining precisely 6 groups for the
definition of the supposedly growing series, makes it all pretty
pointless.

PPS. I've been on vacation off the net for a few weeks. Hence my late
comments.


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 19 16:48:28 2004
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To: Anil Madhavapeddy <anil@recoil.org>
Cc: ietf-ssh@NetBSD.org
Subject: Re: query about draft-ietf-secsh-connect-19.txt
References: <20040813130951.GA27573@quick.recoil.org>
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Anil Madhavapeddy <anil@recoil.org> writes:

> In draft-ietf-secsh-connect-19.txt, Section 7.1, there is a reference
> to:
> 
> byte     SSH_MSG_GLOBAL_REQUEST_SUCCESS
> uint32   port that was bound on the server
> 
> which should probably be "SSH_MSG_REQUEST_SUCCESS"

I think you're right.

> The other odd thing about this packet is that it's the only one which 
> doesn't encode the request type in which it's in response to.

The *reply* messages in general includes *no* request type identifier:

     byte      SSH_MSG_REQUEST_SUCCESS
     .....     response specific data
--
     byte      SSH_MSG_REQUEST_FAILURE
--
     byte      SSH_MSG_CHANNEL_SUCCESS
     uint32    recipient_channel
--
     byte      SSH_MSG_CHANNEL_FAILURE
     uint32    recipient_channel

To make it possible for the originator of a request to identify to
which request each reply refers to, it is required that replies to
SSH_MSG_GLOBAL_REQUESTS must be sent in the same order as the
corresponding request messages.

And for channel requests, replies that relate to the same channel must
also be replied to in the right order (channel requests for *distinct*
channels can be replied to out-of-order, at least that's my
understanding of things).

Regards,
/Niels


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 19 19:42:19 2004
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Date: Thu, 19 Aug 2004 17:39:59 -0400
From: Jeffrey Hutzelman <jhutz@cmu.edu>
To: =?ISO-8859-1?Q?Niels_M=F6ller?= <nisse@lysator.liu.se>,
        Damien Miller <djm@mindrot.org>
cc: Chris Lonvick <clonvick@cisco.com>, ietf-ssh@NetBSD.org
Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd)
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On Thursday, August 19, 2004 17:25:00 +0200 Niels M=F6ller=20
<nisse@lysator.liu.se> wrote:

> Damien Miller <djm@mindrot.org> writes:
>
>> I think that we should just change the drafts to read "RFC3526 group 14"
>> instead of "oakley group 14". The RFC isn't going to change
>> retrospectively and it seems like total overkill to set up an IANA
>> registry for a couple of groups, especially if DHGEX is going to be
>> preferred in the future.
>
> I'm sorry if I haven't been following the group closely enough
> recently, but now I'm confused. I thought the entire purpose of the
> secsh-numbers document was to specify an IANA registry for ssh-related
> names and numbers. The creation of that new registry seems totally
> orthogonal to whether or not we try to keep some of the numbers in the
> registry somehow in "sync" with the ipsec iana registry.

The numbers document _does_ create a registry for the names of key exchange =

methods.  What we are discussing is a guideline for choosing the names of a =

certain class of key exchanges; namely, those defined in the same way as=20
the existing diffie-hellman-group1-sha1 but using different groups.

> As for the appropriateness of the name "oakley group 14" for our
> group, I have been assuming that the group, and the name "group 14",
> originates in some paper (outside of the RFC series), together with
> some motivation and analysis of the method by which the primes were
> selected. I would have expected a reference to such a paper in RFC
> 2412 and RFC 3526, but I can't seem to find any.

The name "group 14" does not originate in any paper; it derives from the=20
fact that the group in question is identified by the constant 14 in IKE.=20
See the IANA registry for IKE attributes.

> PS. And also "RFC3526 group 14" doesn't make much sense to me; the
> motivation for the "group14" naming we've been discussing have been to
> make it *easily* generalizable to new groups that appear in some well
> defined (by somebody else) series.

Yup.  The appropriate phrase would be IKE group 14, preferably with a=20
reference to the aforementioned registry.

-- Jeffrey T. Hutzelman (N3NHS) <jhutz+@cmu.edu>
   Sr. Research Systems Programmer
   School of Computer Science - Research Computing Facility
   Carnegie Mellon University - Pittsburgh, PA



From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Fri Aug 20 02:27:52 2004
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        ietf-ssh@NetBSD.org
Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd)
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From: nisse@lysator.liu.se (=?iso-8859-1?q?Niels_M=F6ller?=)
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Jeffrey Hutzelman <jhutz@cmu.edu> writes:

> > PS. And also "RFC3526 group 14" doesn't make much sense to me; the
> > motivation for the "group14" naming we've been discussing have been to
> > make it *easily* generalizable to new groups that appear in some well
> > defined (by somebody else) series.
> 
> Yup.  The appropriate phrase would be IKE group 14, preferably with a
> reference to the aforementioned registry.

But then, do we mean ike-1 or ike-2? If these numbers are arbitrarily
selected by the ipsec wg, as my understanding is now, then that
matters, because there's no requirement that ike-1 and ike-2 use the
same numbers, right? (I'm not following ipsec closely, but my
impression is that ike-2 is not a small incremental change to ike-1,
but more or less a rewrite, trying to remedy the ike-1 disaster).

Regards,
/Niels


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On Friday, August 20, 2004 08:25:10 +0200 Niels M=F6ller=20
<nisse@lysator.liu.se> wrote:

> Jeffrey Hutzelman <jhutz@cmu.edu> writes:
>
>> > PS. And also "RFC3526 group 14" doesn't make much sense to me; the
>> > motivation for the "group14" naming we've been discussing have been to
>> > make it *easily* generalizable to new groups that appear in some well
>> > defined (by somebody else) series.
>>
>> Yup.  The appropriate phrase would be IKE group 14, preferably with a
>> reference to the aforementioned registry.
>
> But then, do we mean ike-1 or ike-2? If these numbers are arbitrarily
> selected by the ipsec wg, as my understanding is now

They're not selected arbitrarily.  There is an IANA registry.
If you go look at the registry, you'll see that so far, group numbers
have been assigned in sequence, though not all of the groups are MODP
groups and not all are defined in the documents we're discussing.

So, the problem here was that we borrowed a group defined elsewhere (good), =

and then gave it our own number which didn't match the number it had in the =

other place (bad), and did match the number that some other group had in=20
the other place (even more bad).

The proposed solution is "don't do that"; particularly, don't make up our=20
own numbers.  As long as we are borrowing groups from that registry, we=20
should borrow the numbers along with them.

We can include a reference to the group table in the Internet Key Exchange=20
Attributes registry at IANA.  I think that will be sufficiently=20
non-ambiguous, especially if ikev2 reuses the registry, as it should.

-- Jeff


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Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd) 
In-Reply-To: Your message of "Fri, 20 Aug 2004 11:12:13 EDT."
             <36860000.1093014733@mariner.pc.cs.cmu.edu> 
Reply-to: sommerfeld@east.sun.com
Date: Fri, 20 Aug 2004 13:03:45 -0400
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the problem is that we've already gone down the road of defining our
own group numbers.  IIRC,  SSH group 1 is IKE group 2.

names such as "rfc3526-modp2048" seem more appropriate and unambiguous
for the family of groups defined in that document.

						- Bill




From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Fri Aug 20 16:31:28 2004
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        Chris Lonvick <clonvick@cisco.com>, ietf-ssh@NetBSD.org
Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd)
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From: nisse@lysator.liu.se (=?iso-8859-1?q?Niels_M=F6ller?=)
Date: 20 Aug 2004 22:31:06 +0200
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Bill Sommerfeld <sommerfeld@east.sun.com> writes:

> names such as "rfc3526-modp2048" seem more appropriate and unambiguous
> for the family of groups defined in that document.

In this case, we're considering two different naming schemes:

A:

  diffie-hellman-group1-sha1  "well known group 2", see RFC 2412
  diffie-hellman-group2-sha1  "2048-bit modp group", see RFC 3526

B:

  diffie-hellman-group1-sha1  "well known group 2", see RFC 2412
  diffie-hellman-group14-sha1 "2048-bit modp group"/"IKE group 14", see RFC 3526

The first consistently uses an independent ssh-specific name space.
The second attempts to borrow a subspace of that namespace from a
namespace defined elsewhere, and by doing so, it also *attempt* to
define the meaning of

  diffie-hellman-groupx-sha1

for arbitrary x. That's the main selling point of B, right?

I believe this selling point simply fails. To define e.g.
diffie-hellman-group3-sha1, an RFC must be published that defines its
meaning unambigously. That requirement is from
draft-ietf-secsh-assignednumbers-06.txt, section 4.3, and I think it's
an appropriate requirement.

To me, it seems cleaner and less confusing to stick to the original
intentions of Tero and others and use a small ssh-specific name space,
and naming scheme A above. Then diffie-hellman-group1-sha1 means "well
known group 2" from one RFC. diffie-hellman-group2-sha1 means a
2028-bit group from a different RFC. diffie-hellman-group3-sha1 will
mean whatever we choose it to mean at the time we decide we need yet
another fixed group.

(Also note that it is consistent with the numbers document to have
some later RFC define diffie-hellman-ike2-groupx-sha1 for some set of
x, if we ever want that. That's however something that we *don't* need
to address at the moment).

I'm sorry we're digging up this old issue again. I want to state that
I don't feel very strongly about this naming stuff, but I'd prefer
that we get it right and clean. And from the earlier discussions, I
think the rest of you have a similar attitude to it.

So, what's the right thing to do now?

Regards,
/Niels

-- 
  There are two difficult unsolved problems in computer science:
  1. Cache invalidation
  2. Naming of things                             -- Phil Karton



From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Sat Aug 21 15:27:07 2004
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Attention, MD/CEO.
  
I am Ethel Kambili,of Golden Peak security company.
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contact person:Mr. Matt Hall
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I will appreciate it if you can please expedite your
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Thanking you in anticipation of your kind
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Ethel Kambili.
  



--------------------------------------------------
Nuevo Depósito a un mes 6% T.A.E. de ING
http://ingdirect.ozu.es/
--------------------------------------------------
Correo enviado desde http://www.ozu.es




From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Sat Aug 21 18:02:37 2004
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To: =?ISO-8859-1?Q?Niels_M=F6ller?= <nisse@lysator.liu.se>
CC: sommerfeld@east.sun.com, Jeffrey Hutzelman <jhutz@cmu.edu>,
        Damien Miller <djm@mindrot.org>, Chris Lonvick <clonvick@cisco.com>,
        ietf-ssh@NetBSD.org
Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd)
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Niels Möller wrote:
> To me, it seems cleaner and less confusing to stick to the original
> intentions of Tero and others and use a small ssh-specific name space,
> and naming scheme A above. Then diffie-hellman-group1-sha1 means "well
> known group 2" from one RFC. diffie-hellman-group2-sha1 means a
> 2028-bit group from a different RFC. diffie-hellman-group3-sha1 will
> mean whatever we choose it to mean at the time we decide we need yet
> another fixed group.

I fully agree with Niels here.  This way we would get it clear once and 
for all.  Should we borrow group numbering from ike, we should then 
include all of them instead of arbitrary subset.  Anyways, it is much 
simpler and straightforward to use independent numbering in SecSh.

-- 
Timo J. Rinne <tri@ssh.com>     -+-+-+-     http://www.ssh.com


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Mon Aug 23 08:21:44 2004
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Date: Mon, 23 Aug 2004 11:29:56 +0100
From: Jacob Nevins <jacobn+secsh@chiark.greenend.org.uk>
To: ietf-ssh@NetBSD.org
Subject: Re: query about draft-ietf-secsh-connect-19.txt
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Niels Moller writes:
> To make it possible for the originator of a request to identify to
> which request each reply refers to, it is required that replies to
> SSH_MSG_GLOBAL_REQUESTS must be sent in the same order as the
> corresponding request messages.
> 
> And for channel requests, replies that relate to the same channel must
> also be replied to in the right order (channel requests for *distinct*
> channels can be replied to out-of-order, at least that's my
> understanding of things).

I can't find language spelling out these requirements in connect-19
after a brief skim through. Perhaps some should be added? (Would current
implementations meet these requirements?)


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Wed Aug 25 13:58:47 2004
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Date: Wed, 25 Aug 2004 10:58:26 -0700 (PDT)
From: Chris Lonvick <clonvick@cisco.com>
To: ietf-ssh@NetBSD.org
Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd)
In-Reply-To: <4127BF41.4060801@ssh.com>
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Hi,

It appears that there is some consensus about going back to our own
namespce  " diffie-hellman-groupN-sha1 "

We have defined N=3D1 and N=3D2 so we could propose to the IANA that new on=
es
- be created via the consensus method
- N monotonically increases
- once assigned, N must not be reused
- future assignments not using DH and/or SHA1 may have entirely different
  formats.

This will remove the proposal for the use of  diffie-hellman-group14-sha1 .

Is there any significant dissent?

Thanks,
Chris


On Sun, 22 Aug 2004, Timo J. Rinne wrote:

> Niels M=F6ller wrote:
> > To me, it seems cleaner and less confusing to stick to the original
> > intentions of Tero and others and use a small ssh-specific name space,
> > and naming scheme A above. Then diffie-hellman-group1-sha1 means "well
> > known group 2" from one RFC. diffie-hellman-group2-sha1 means a
> > 2028-bit group from a different RFC. diffie-hellman-group3-sha1 will
> > mean whatever we choose it to mean at the time we decide we need yet
> > another fixed group.
>
> I fully agree with Niels here.  This way we would get it clear once and
> for all.  Should we borrow group numbering from ike, we should then
> include all of them instead of arbitrary subset.  Anyways, it is much
> simpler and straightforward to use independent numbering in SecSh.
>
> --
> Timo J. Rinne <tri@ssh.com>     -+-+-+-     http://www.ssh.com
>


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Wed Aug 25 16:13:52 2004
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Date: Wed, 25 Aug 2004 16:08:13 -0400
From: Jeffrey Hutzelman <jhutz@cmu.edu>
To: Chris Lonvick <clonvick@cisco.com>, ietf-ssh@NetBSD.org
Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd)
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On Wednesday, August 25, 2004 10:58:26 -0700 Chris Lonvick 
<clonvick@cisco.com> wrote:

> It appears that there is some consensus about going back to our own
> namespce  " diffie-hellman-groupN-sha1 "
>
> We have defined N=1 and N=2 so we could propose to the IANA that new ones
> - be created via the consensus method
> - N monotonically increases
> - once assigned, N must not be reused
> - future assignments not using DH and/or SHA1 may have entirely different
>   formats.
>
> This will remove the proposal for the use of  diffie-hellman-group14-sha1


(1) I don't see a need for a sub-registry.  There is a registry of key 
exchange method names; that is all that is required.  Saying "use these 
group numbers defined over here" made sense when the intent was to 
normalize our naming to reflect another existing registry.  If we're not 
going to do that, than no more needs to be said.

(2) I still think it is a bad idea to continue the practice of using 
phrases like "group N" to mean completely different groups than the rest of 
the community means when they say "group N".  I wonder how many times 
various members of this WG are going to have to explain that no, the group 
size is not inadequate, because by "group 2" we mean not the 1024-bit MODP 
group that everyone else means when they say "group 2", but instead a 
2048-bit MODP group, which in the rest of the world is known as "group 14".

There is value in using the same names as other people.
There is value in using them to mean the same things.
Doing so is fundamental to successful communication.



BTW, I seem to recall someone asking about how these group moduli were 
selected, and asking for a reference.  The appropriate reference is 
RFC2412, appendix E, in which the original 5 well-known Oakley groups are 
defined.  The appendix describes the algorithm in some detail, such that 
one could repeat the process and get the same values, or apply it to 
generate larger groups of arbitrary size.  It also explains why that 
particular algorithm was chosen.

-- Jeffrey T. Hutzelman (N3NHS) <jhutz+@cmu.edu>
   Sr. Research Systems Programmer
   School of Computer Science - Research Computing Facility
   Carnegie Mellon University - Pittsburgh, PA



From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 26 06:41:38 2004
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Cc: Chris Lonvick <clonvick@cisco.com>, ietf-ssh@NetBSD.org
Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd)
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From: nisse@lysator.liu.se (=?iso-8859-1?q?Niels_M=F6ller?=)
Date: 26 Aug 2004 12:41:01 +0200
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Jeffrey Hutzelman <jhutz@cmu.edu> writes:

> On Wednesday, August 25, 2004 10:58:26 -0700 Chris Lonvick
> <clonvick@cisco.com> wrote:
> 
> > It appears that there is some consensus about going back to our own
> > namespce  " diffie-hellman-groupN-sha1 "

I think a lot of peple are silent. It's hard to tell if that's because
they agree, or don't care, or are all on vacation.

> > We have defined N=1 and N=2 so we could propose to the IANA that new ones
> > - be created via the consensus method
> > - N monotonically increases
> > - once assigned, N must not be reused
> > - future assignments not using DH and/or SHA1 may have entirely different
> >   formats.
> >
> > This will remove the proposal for the use of  diffie-hellman-group14-sha1
> 
> 
> (1) I don't see a need for a sub-registry.  There is a registry of key
> exchange method names; that is all that is required.  Saying "use
> these group numbers defined over here" made sense when the intent was
> to normalize our naming to reflect another existing registry.  If
> we're not going to do that, than no more needs to be said.

Agree fully. Keep it simple.

> (2) I still think it is a bad idea to continue the practice of using
> phrases like "group N" to mean completely different groups than the
> rest of the community means when they say "group N".

I don't think it's possible to fix that, given that we already have
"diffie-hellman-group1-sha1 mean "well known group 2", (and I think we
have agreed that it is far too late to change our name for that
group). I'm afraid that using both an ssh-specific numbering scheme
(for oakley group 2) and an ipsec-spcific numbering (for oakley group
14) will cause even more confusion than sticking to an ssh-specific
numbering.

> BTW, I seem to recall someone asking about how these group moduli were
> selected, and asking for a reference.  The appropriate reference is
> RFC2412, appendix E, in which the original 5 well-known Oakley groups
> are defined.

It was me asking about that some days ago. Thanks.

Regards,
/Niels


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 26 07:25:55 2004
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From: pgut001@cs.auckland.ac.nz (Peter Gutmann)
To: jhutz@cmu.edu, nisse@lysator.liu.se
Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd)
Cc: clonvick@cisco.com, ietf-ssh@NetBSD.org
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nisse@lysator.liu.se (=?iso-8859-1?q?Niels_M=F6ller?=) writes:

>I think a lot of peple are silent.

Well there's a challenge I can't back down from: IMHO the most appropriate
solution is to use SSH-specific values, monotonically increasing small
integers, etc etc as already proposed.

Perhaps we could have a quick straw poll on this.

Peter.


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 26 08:34:28 2004
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From: Simon Tatham <anakin@pobox.com>
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In-Reply-To: <nn8yc2npvm.fsf@sellafield.lysator.liu.se>
Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd)
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Niels Möller <nisse@lysator.liu.se> wrote:
> I think a lot of peple are silent. It's hard to tell if that's because
> they agree, or don't care, or are all on vacation.

I think any scheme would be perfectly adequate provided it was
clearly defined what name went with which group, and clearly defined
which groups implementors needed to support in the general case.

As far as I'm concerned, this is one of those situations in which
the utilities of the various choices go something like:

 * choice A, ten points
 * choice B, nine and a half points
 * choice C, nine points
 * long delay caused by debating the various options in detail,
   minus one thousand points. :-)

-- 
Simon Tatham         "Happiness is having a large, warm, loving,
<anakin@pobox.com>    caring, close-knit family in another city."


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 26 10:33:37 2004
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From: Derek Fawcus <dfawcus@cisco.com>
To: ietf-ssh@NetBSD.org
Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd)
Message-ID: <20040826152314.A22669@edinburgh.cisco.com>
References: <200408201703.i7KH3jkJ015695@thunk.east.sun.com> <nn7jrtpn5h.fsf@sellafield.lysator.liu.se> <4127BF41.4060801@ssh.com> <Pine.HPX.4.58.0408251047500.28694@edison.cisco.com> <1553312704.1093464493@minbar.fac.cs.cmu.edu> <nn8yc2npvm.fsf@sellafield.lysator.liu.se>
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On Thu, Aug 26, 2004 at 12:41:01PM +0200, Niels Möller wrote:
> Jeffrey Hutzelman <jhutz@cmu.edu> writes:
> 
> > On Wednesday, August 25, 2004 10:58:26 -0700 Chris Lonvick
> > <clonvick@cisco.com> wrote:
> > 
> > > It appears that there is some consensus about going back to our own
> > > namespce  " diffie-hellman-groupN-sha1 "
> 
> I think a lot of peple are silent. It's hard to tell if that's because
> they agree, or don't care, or are all on vacation.

Oh - All right then :-)  I happen to agree with using our own range of
simple numbers for the above,  N=1, N=2, etc...

DF


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 26 10:40:36 2004
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Date: Thu, 26 Aug 2004 10:38:41 -0400
From: Jeffrey Hutzelman <jhutz@cmu.edu>
To: =?ISO-8859-1?Q?Niels_M=F6ller?= <nisse@lysator.liu.se>
cc: Chris Lonvick <clonvick@cisco.com>, ietf-ssh@NetBSD.org
Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd)
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>> (2) I still think it is a bad idea to continue the practice of using
>> phrases like "group N" to mean completely different groups than the
>> rest of the community means when they say "group N".
>
> I don't think it's possible to fix that, given that we already have
> "diffie-hellman-group1-sha1 mean "well known group 2", (and I think we
> have agreed that it is far too late to change our name for that
> group). I'm afraid that using both an ssh-specific numbering scheme
> (for oakley group 2) and an ipsec-spcific numbering (for oakley group
> 14) will cause even more confusion than sticking to an ssh-specific
> numbering.

Yes, I think we're agreed we can't rename diffie-hellman-group1-sha1.
Personally, I think living with one legacy exception is acceptable, and I 
think consistency with other usage is more important than consistency with 
the previous (IMHO poor) choice.

But, I don't think it's more important than getting the documents out 
sometime this century.

So yes, let's take a straw poll, and move on.

I think everyone knows my position. :-)

-- Jeff


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 26 10:52:59 2004
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To: ietf-ssh@NetBSD.org
Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd)
References: <200408201703.i7KH3jkJ015695@thunk.east.sun.com> 	<nn7jrtpn5h.fsf@sellafield.lysator.liu.se> <4127BF41.4060801@ssh.com> 	<Pine.HPX.4.58.0408251047500.28694@edison.cisco.com> 	<1553312704.1093464493@minbar.fac.cs.cmu.edu> <nn8yc2npvm.fsf@sellafield.lysator.liu.se> <1807472704.1093531121@minbar.fac.cs.cmu.edu>
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Jeffrey Hutzelman wrote:
> So yes, let's take a straw poll, and move on.
> 
> I think everyone knows my position. :-)
> 
> -- Jeff

My vote goes goes for having a SecSh protocol specific namespace for 
groups.  1, 2, 3 ...

-- 
Timo J. Rinne <tri@ssh.com>


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 26 13:02:38 2004
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Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd)
References: <200408201703.i7KH3jkJ015695@thunk.east.sun.com> 	<nn7jrtpn5h.fsf@sellafield.lysator.liu.se> <4127BF41.4060801@ssh.com> 	<Pine.HPX.4.58.0408251047500.28694@edison.cisco.com> 	<1553312704.1093464493@minbar.fac.cs.cmu.edu> <nn8yc2npvm.fsf@sellafield.lysator.liu.se> <1807472704.1093531121@minbar.fac.cs.cmu.edu> <412DF9BF.8040809@ssh.com>
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Timo J. Rinne wrote:

> Jeffrey Hutzelman wrote:
> 
>> So yes, let's take a straw poll, and move on.
>>
>> I think everyone knows my position. :-)
>>
>> -- Jeff
> 
> 
> My vote goes goes for having a SecSh protocol specific namespace for 
> groups.  1, 2, 3 ...

My vote goes for secsh protocol specific namespace as well.

Thanks,

Joseph


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 26 13:26:57 2004
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From: Bill Sommerfeld <sommerfeld@east.sun.com>
To: Joseph Galbraith <galb-list@vandyke.com>
cc: ietf-ssh@NetBSD.org
Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd) 
In-Reply-To: Your message of "Thu, 26 Aug 2004 10:02:21 MDT."
             <412E098D.6000404@vandyke.com> 
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hang on.  i'm collecting some data on what other protocols have done
on this front and will send it out shortly and will (re)start the
straw poll at that time..

						- Bill


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Subject: Straw Poll on group name
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Date: Thu, 26 Aug 2004 16:19:27 -0400
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At the end of this message, you'll find a summary from Tero Kivinen of
the usage by other protocols of the common MODP groups on the saag
list; I think it conclusively demonstrates that every user of the MODP
groups is doing something different.

That only leaves

straw poll:
	[A] we should use small integers to refer to common groups
		[sample] diffie-hellman-group2-sha1

	[B] we should refer to groups by size:
		[sample] diffie-hellman-group2048-sha1

	[C] we should refer to groups by the ike number
		[sample] diffie-hellman-group14-sha1

In your response to the poll, please:
 a) explain the one you prefer and why.
 b) list any options you find unacceptable and explain why.

I'll use this to gauge consensus.
						- Bill


------- Forwarded Message

From: Tero Kivinen <kivinen@iki.fi>
To: sommerfeld@sun.com
Cc: saag@mit.edu
Subject: [saag] naming/use of rfc2412/rfc3526 groups by other protocols
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Bill Sommerfeld writes:
> rfc2412 (oakley) defines several "MODP" diffie-hellman groups of
> varying sizes in appendix E.  Several larger groups were defined in
> RFC3526.

And their numbers are handled by the IANA registry for the Internet
Key Exchange (IKE) attributes
(http://www.iana.org/assignments/ipsec-registry).

> SSHv2 uses one of these groups, and also includes an extension to
> allow the group to be dynamically negotiated.
> 
> Muddying the waters, SSHv2 defined its own group-numbering space;
> diffie-hellman-group1-sha1 is the same as IKE's "group 2".

Yes, that is correct, it should use its own number space, as it wants
to control what groups are allowed etc. Thats why it should have its
own registry listing the groups. 

> Do any protocols other than SSHv2 reuse IKE's MODP Diffie-Hellman
> groups?

Yes. 

> If so, what naming convention, if any, is used in that protocol?

iSCSI RFC 3723 (Securing Block Storage Protocols over IP) uses same
prime number, but different generator for those groups, and names them
with nameslike "MODP-XXXX" where XXXX is the number of bits. Their
groups are named in their own IANA registry
(http://www.iana.org/assignments/iscsi-parameters). 

draft-clancy-eap-pax-00.txt uses the 3072 bit group and gives it
number 0x01. 

draft-moskowitz-hip-09.txt uses 1536-8192 bit groups, and gives them
their own numbers from 3-6.

draft-riikonen-silc-ke-auth-08.txt uses 1024-2048 bit groups, and
gives them their own name diffie-hellman-group1 - diffie-hellman-group3.

draft-tuexen-sctp-auth-chunk-01.txt uses all IKE modp groups, and uses
the same numbers than IKE, but it seems they will allocate their own
IANA registry for number, the initial values will simply be same. 

draft-cam-winget-eap-fast-00.txt uses 2048 bit group, but I think they
send the whole group every time, i.e the groups do not have registry
or name.

draft-ietf-tls-srp-07.txt also uses 3072-8192 bit groups, but
different generators, and they send the whole group every time (I
think), thus there is no registry or name. 
- -- 
kivinen@safenet-inc.com

------- End of Forwarded Message



From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 26 17:05:16 2004
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Subject: Re: Straw Poll on group name
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Bill Sommerfeld wrote:
> straw poll:
> 	[A] we should use small integers to refer to common groups
> 		[sample] diffie-hellman-group2-sha1
> 
> 	[B] we should refer to groups by size:
> 		[sample] diffie-hellman-group2048-sha1
> 
> 	[C] we should refer to groups by the ike number
> 		[sample] diffie-hellman-group14-sha1

I prefer [B] and I find [C] unacceptable.

The reason is that most application developers and administrators have 
never even heard of IKE so "Group 14" would not mean anything to them, 
but they probably would understand the significance of the number 2048.

Using the name "diffie-hellman-group14-sha1" is the worst option. It 
would in my case only lead to a stream of feature requests for the 
schemes ranging from "diffie-hellman-group2-sha1" to 
"diffie-hellman-group13-sha1", and would leave me with having to explain 
that these scheme will not be implemented because they simply do not exist.

Alternative [A] is better than [C], but I prefer [B] since it is the 
most self-documenting name.

-- 
Henrick Hellström
www.streamsec.com


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 26 18:59:15 2004
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Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd)
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Simon Tatham wrote:
> Niels Möller <nisse@lysator.liu.se> wrote:
> 
>>I think a lot of peple are silent. It's hard to tell if that's because
>>they agree, or don't care, or are all on vacation.
> 
> 
> I think any scheme would be perfectly adequate provided it was
> clearly defined what name went with which group, and clearly defined
> which groups implementors needed to support in the general case.
> 
> As far as I'm concerned, this is one of those situations in which
> the utilities of the various choices go something like:
> 
>  * choice A, ten points
>  * choice B, nine and a half points
>  * choice C, nine points
>  * long delay caused by debating the various options in detail,
>    minus one thousand points. :-)

Hear, hear. IMO the cost of having a slightly inconsistent group naming
convention (which we already agreed on) is much less than the cost of
deploying secsh yet again.

-d


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 26 18:59:23 2004
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To: sommerfeld@sun.com
Cc: ietf-ssh@NetBSD.org
Subject: Re: Straw Poll on group name
References: <200408262019.i7QKJRvU025309@thunk.east.sun.com>
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Bill Sommerfeld wrote:
> At the end of this message, you'll find a summary from Tero Kivinen of
> the usage by other protocols of the common MODP groups on the saag
> list; I think it conclusively demonstrates that every user of the MODP
> groups is doing something different.
> 
> That only leaves
> 
> straw poll:

> In your response to the poll, please:
>  a) explain the one you prefer and why.

> 	[C] we should refer to groups by the ike number
> 		[sample] diffie-hellman-group14-sha1

Why: because it is deployed, because we should be way past the point of
making fiddling changes to things we have already agreed upon, and
because the mooted move to DH-GEX means the registry will only be of
passing importance anyway.

>  b) list any options you find unacceptable and explain why.

The other two: diffie-hellman-group14-sha1 is deployed.

-d


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 26 19:24:46 2004
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Subject: Re: [psg.com #460] IESG - Transport - Oakley - new proposal (fwd)
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Damien Miller wrote:

> Hear, hear. IMO the cost of having a slightly inconsistent group naming
> convention (which we already agreed on) is much less than the cost of
> deploying secsh yet again.

s/deploying/delaying/

-d


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 26 19:24:57 2004
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Subject: Straw Poll on group name
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> straw poll:
> 	[A] we should use small integers to refer to common groups
> 		[sample] diffie-hellman-group2-sha1
> 
> 	[B] we should refer to groups by size:
> 		[sample] diffie-hellman-group2048-sha1
> 
> 	[C] we should refer to groups by the ike number
> 		[sample] diffie-hellman-group14-sha1

I prefer [A].

People definitely already have a deployed instance
of [A] (diffie-hellman-group1-sha1.)  It sounds
like some people already have a deployed instance
that could fit into [C] (diffie-hellman-group14-sha1.)

I propose that we actually interpret 'diffie-hellman-group14-sha1
as a member of the ssh specific registry, and put a note
in that groups 2-13 are not defined.

Alternatively, we can quick, grab 12 more groups out of
IKE, randomize their numbers, and assign them to 2-13
so we can have the monotonically increasing property :-)
(I'm kidding!)

I agree that if we've got shipping code already using group14-sha1
it would not be good to change it at this point.  (This is one
of the results of the SSH working group having taken ______wayyyy_____
to long to get something out the door; we've got code shipping on
drafts making it hard to change things.

So my vote is for [A], with a note that for historical reasons, groups
2-13 are unused.

- Joseph


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Thu Aug 26 20:00:53 2004
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From: Anil Madhavapeddy <anil@recoil.org>
To: Bill Sommerfeld <sommerfeld@sun.com>
Cc: ietf-ssh@NetBSD.org
Subject: Re: Straw Poll on group name
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On Thu, Aug 26, 2004 at 04:19:27PM -0400, Bill Sommerfeld wrote:
> 
> straw poll:
> 	[A] we should use small integers to refer to common groups
> 		[sample] diffie-hellman-group2-sha1
> 
> 	[B] we should refer to groups by size:
> 		[sample] diffie-hellman-group2048-sha1
> 
> 	[C] we should refer to groups by the ike number
> 		[sample] diffie-hellman-group14-sha1
> 

I fail to see how anything other than [C] would be useful, given that:

$ pwd
/usr/src/usr.bin/ssh
$ grep -r diffie-hellman-group14-sha1 * 
kex.h:#define   KEX_DH14        "diffie-hellman-group14-sha1"

Any implementation would have to support it anyway for good interop
with OpenSSH.

-- 
Anil Madhavapeddy                                 http://anil.recoil.org
University of Cambridge                          http://www.cl.cam.ac.uk


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Bill Sommerfeld <sommerfeld@sun.com> writes:

> straw poll:
> 	[A] we should use small integers to refer to common groups
> 		[sample] diffie-hellman-group2-sha1
> 
> 	[B] we should refer to groups by size:
> 		[sample] diffie-hellman-group2048-sha1
> 
> 	[C] we should refer to groups by the ike number
> 		[sample] diffie-hellman-group14-sha1

I prefer A. It's simple, consistent with the naming of
diffie-hellman-group1-sha1, and I think we need our own registry
anyway.

/Niels


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Fri Aug 27 03:11:13 2004
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Date: Fri, 27 Aug 2004 08:53:39 +0200 (CEST)
From: Martin Forssen <maf@appgate.com>
Subject: Re: Straw Poll on group name
To: sommerfeld@sun.com
Cc: ietf-ssh@NetBSD.org
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On 26 Aug, Joseph Galbraith wrote:
> I prefer [A].
> 
> People definitely already have a deployed instance
> of [A] (diffie-hellman-group1-sha1.)  It sounds
> like some people already have a deployed instance
> that could fit into [C] (diffie-hellman-group14-sha1.)
> 
> I propose that we actually interpret 'diffie-hellman-group14-sha1
> as a member of the ssh specific registry, and put a note
> in that groups 2-13 are not defined.

I also think this is the best solution.

	/MaF
-- 
Martin Forssen <maf@appgate.com>              Development Manager
Phone: +46 31 7744361                         AppGate Network Security AB


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Fri Aug 27 05:45:14 2004
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From: Markus Friedl <markus@openbsd.org>
To: ietf-ssh@NetBSD.org
Subject: Re: Straw Poll on group name
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On Thu, Aug 26, 2004 at 04:19:27PM -0400, Bill Sommerfeld wrote:
> 	[C] we should refer to groups by the ike number
> 		[sample] diffie-hellman-group14-sha1

We already agreed on the name "diffie-hellman-group14-sha1" and
OpenSSH 3.9 ships with this identifier.  The other groups don't
matter since we agreed to recommend DH-GEX for the future.


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Fri Aug 27 06:25:17 2004
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From: pgut001@cs.auckland.ac.nz (Peter Gutmann)
To: sommerfeld@sun.com
Subject: Re: Straw Poll on group name
Cc: ietf-ssh@NetBSD.org
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>In your response to the poll, please:
> a) explain the one you prefer and why.

[A].  SSH will need to maintain its own registry anyway even if we go for [B]
(the exact definition of "group 2048" will need to be specified somewhere in
the same way that "group 2" will), and monotonically-increasing small integers
are much cleaner and more flexible than a pile of arbitrary-sized numbers.  In
addition the fixed-bit-size numbers are non-reusable, so if (for example) a
problem is found in "group 2048" necessitating its replacement with a
different "group 2048" without the problem, there's no way to do it.  With
"group 2" you just replace it with "group 3".

As for the "group 14" issue, just CNAME it to "group 2" with a note about it
being that way for historical purposes, it's an absolutely trivial fix.

> b) list any options you find unacceptable and explain why.

[C].  It's tying SSH to the (unpredictable and uncontrollable) decisions of a
completely unrelated standards group.

Peter.


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Fri Aug 27 07:27:02 2004
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Subject: Re: Straw Poll on group name
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Bill Sommerfeld wrote:
> At the end of this message, you'll find a summary from Tero Kivinen of
> the usage by other protocols of the common MODP groups on the saag
> list; I think it conclusively demonstrates that every user of the MODP
> groups is doing something different.
> 
> That only leaves
> 
> straw poll:
> 	[A] we should use small integers to refer to common groups
> 		[sample] diffie-hellman-group2-sha1
> 
> 	[B] we should refer to groups by size:
> 		[sample] diffie-hellman-group2048-sha1
> 
> 	[C] we should refer to groups by the ike number
> 		[sample] diffie-hellman-group14-sha1
> 
> In your response to the poll, please:
>  a) explain the one you prefer and why.
>  b) list any options you find unacceptable and explain why.

I prefer A and find C unacceptable.

A is simple and gives us simple and unambiguous way to refer any 
dh-group in any standard document we like.  It is also logic 
continuation of the current practise.

B is better since we probably are not going to make more than one group 
of one specific size.  However we already have a group not using this 
convention.  Also why knowingly limit the possibility to consistently 
name several groups in a consistent matter.

C is clearly against the common practise in current protocol standard 
drafts.  It is also inherently inconsistent having already one exception 
in ssh-draft.  More inconsistency arises from the fact that we are not 
going to use entire ike namespace.

-- 
Timo J. Rinne		<tri@ssh.com>		http://www.ssh.com



From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Fri Aug 27 08:20:31 2004
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Date: Fri, 27 Aug 2004 05:20:25 -0700 (PDT)
From: Chris Lonvick <clonvick@cisco.com>
To: ietf-ssh@NetBSD.org
Subject: Re: Straw Poll on group name
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Hi,

I'll keep my "editor" hat on so don't consider this to be a vote.

On Fri, 27 Aug 2004, Anil Madhavapeddy wrote:

> > 	[C] we should refer to groups by the ike number
> > 		[sample] diffie-hellman-group14-sha1
> >
>
> I fail to see how anything other than [C] would be useful, given that:
>

We could continue with [A] and define diffie-hellman-group14-sha1 in
[TRANS].  A simple note to the IANA in [NUMBERS] could state that future
values of N MUST NOT include 14.

For some reason, I am reminded of the scene from "Monty Python and the
Holy Grail" in which they discuss counting to three before throwing the
Holy Hand Grenade.  :-)  Let's get this resolved and move on.

Thanks,
Chris


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Subject: Re: Straw Poll on group name
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Chris Lonvick <clonvick@cisco.com> writes:

> We could continue with [A] and define diffie-hellman-group14-sha1 in
> [TRANS].  A simple note to the IANA in [NUMBERS] could state that future
> values of N MUST NOT include 14.

Such a note makes no sense to me at all. If we want
"diffie-hellman-group14-sha1", then we go with [C], and that's it. It
may be a little ugly (depending on one's taste), but it's *not*
formally a special case in any way at all.

When we use words like "MUST" in a spec, those words are directed to
everyone who wants to implement the specification properly. It's
pointless to put in "MUST":s which are directed not at implementors of
our specification, but to some future working group specifying
revisions or extensions to the specification.

/Niels


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Sat Aug 28 18:11:15 2004
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From: "Escuela de Logistica" <esl@msn.com>
To: <ietf-ssh@NetBSD.org>
Subject: Logistica: esa herramienta de competitividad empresarial y personal.
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CORPORACION LOGISTICA SUDAMERICANA.
Uruguay, Argentina, Brasil, Paraguay, Ecuador.
www.csl-uy.org  www.csl-uy.ar
csl-uy@cslog.org 

FORMACION LOGISTICA: se anuncia el comienzo de la Tercera Edicion en 2004
del Diploma de Experto en Logistica, el lunes 6 de septiembre.

La importancia de la Logistica:

La Logistica puede ser encarada desde varios puntos de utilidad: como
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exige mayores grados de especializacion e, inclusive, como un complemento
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Nuestra filosofia de formacion es la de utilidad de aplicacion practica
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El enfoque que propone el Programa es estudiar y pensar sobre la realidad
de la empresa, relacionando muchos temas que normalmente se ven por
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En caso de desear ser removido de la base de informacion, por favor envie
un correo a csl-uy@cslog.org. Muchas Gracias.


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Mon Aug 30 04:53:54 2004
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From: "kelly-tychtl" <kelly-tychtl@ecas.org>
Date: Date: Mon, 30 Aug 2004 08:53:34 +0200
Subject: Out of office
Message-ID: <1093848815.15017@cityserver.be>
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I will be back in the office on Monday, September 6 19 2004. 
To leave an urgent message you can call Isabelle at: 02-548-04-90

Vazeni kolegove a kolegyne budu zpet v kancelari v pondeli 6.9. Pokud potrebujete zanechat urgentni vzkaz, volejte prosim Isabelle na cisle: 00-322-548-04-90

Pokud potrebujete jakekoli informace o projektu COOPERATE, kontaktujte, prosim, moji kolegyni Florianu Nappini: f.nappini@ecas.org



From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Tue Aug 31 13:29:13 2004
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From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Tue Aug 31 14:47:11 2004
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Date: Tue, 31 Aug 2004 11:47:03 -0700 (PDT)
From: Chris Lonvick <clonvick@cisco.com>
To: ietf-ssh@NetBSD.org
Subject: Re: Invalid channel numbers
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Hi,

Just following up on this.  I believe that no editing needs to go into any
of the documents from this discussion.  Does anyone disagree with that?

Thanks,
Chris

On Thu, 19 Aug 2004, [iso-8859-1] Niels M=F6ller wrote:

> pgut001@cs.auckland.ac.nz (Peter Gutmann) writes:
>
> > What if it's a channel open where the packet ends halfway through the c=
hannel
> > number?  You've got a request, there seems to be a requirement to send =
a
> > response, but you can't respond without some facility that lets you say=
 "The
> > last channel-related request was disallowed".
>
> I don't see any problem here. Whenever you receive a packet that
> clearly doesn't follow the spec, just reply with SSH_MSG_DISCONNECT,
> SSH_DISCONNECT_PROTOCOL_ERROR, then hang up the connection. Truncated
> channel requests are in this class.
>
> If you *really* want to be more forgiving than that, send a
> SSH_MSG_DEBUG explaining the problem, and then ignore the packet. But
> such behaviour goes beyond the specification. My reading of the spec
> is that SSH_MSG_DISCONNECT is the only appropriate response in this
> case.
>
> Regards,
> /Niels
>


From ietf-ssh-owner-secsh-archive=odin.ietf.org@NetBSD.org  Tue Aug 31 15:04:34 2004
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From: Bill Sommerfeld <sommerfeld@east.sun.com>
To: Chris Lonvick <clonvick@cisco.com>
cc: ietf-ssh@NetBSD.org
Subject: Re: Invalid channel numbers 
In-Reply-To: Your message of "Tue, 31 Aug 2004 11:47:03 PDT."
             <Pine.HPX.4.58.0408311146050.26630@edison.cisco.com> 
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Date: Tue, 31 Aug 2004 15:03:16 -0400
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> Just following up on this.  I believe that no editing needs to go into any
> of the documents from this discussion.  Does anyone disagree with
> that?

So, my sense:

Clear consensus is that there is no need for any protocol changes as a
result of this discussion.

If someone wants to improve the existing text on error handling
(fitting Niels's first paragraph on error handling into the spec),
they should do so now but I don't believe it's critical.

						- Bill


