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Internet-Drafts@ietf.org · Mon, 11 Jun 2007 15:50:02 -0400

“Today, network access clients are =
typically preconfigured with a list of access networks, and =
corresponding identities

and credentials.  However, as new =
network access technologies emerge and authentication mechanisms and =
operators have proliferated, it has become increasingly likely that =
users will encounter networks for which preconfigured settings in the =
client are either not available or insufficient, yet which can deliver =
desired services and can successfully authenticate the user to his home =
AAA server. In such a situation, users can have difficulty in =
determining which network to connect to, and how to authenticate to that =
network.”
Issue: Section 1 Problem =
Statement
Submitter =
name: Bernard Aboba
Submitter =
email address: aboba@internaut.com
Date=
 Submitted: May 23, 2007
Reference:
=
Document: =
NETSEL-07
Comment =
type: Editorial
Priority: =
S
Section: =
1
Rationale/Explanation of =
issue:

In =
reading over Section 1, it is not clear to me that the essence of the =
problem has been clearly stated. =

I believe =
that the central issue here is that a user can encounter networks for =
which there is no preconfiguration. =

Also, I =
think there is an assumption that the networks that a user can encounter =
may restrict access to the Internet in some way so that all Internet =
services may not be accessible.  =

I believe =
that these assumptions need to be more clearly spelled out.  Find =
enclosed below a rewrite of Section 1 that hopefully makes these =
assumptions more clear. 

"1.  =
Introduction

   Today, network access clients =
are typically preconfigured

   with a list of access networks, =
and corresponding identities

   and credentials.  However, =
as network access mechanisms

   and operators have proliferated, =
it has become increasingly

   likely that users will encounter =
networks for which no

   preconfigured settings are =
available, yet which offer

   desired services and the ability =
to successfully authenticate 

   with the user's home AAA =
server.  In such a situation, 

   users can have difficulty in =
determining which network to

   connect to, and how to =
authenticate to that network.

   The problem arises when any of =
the following conditions are =
true:

   o  More than one network =
attachment point is available, and the

      attachment =
points differ in their roaming arrangements or 

      access to =
services, or belong to operators which the

      network access =
client is not preconfigured for.

      In this case, =
a user may have difficulty determining

      what services =
are available at each network attachment point, and

      which =
attachment points it can successfully authenticate to. 

      For example, =
the user may not have pre-configured an identity

      and associated =
credentials for use with a network,  yet it is

      possible that =
the user's home AAA server is reachable from

      that network, =
enabling the user to successfully authenticate.  

      While the =
local network's capabilities may be advertised, 

      where access =
to the Internet is restricted, it can

      be difficult =
for the user to determine apriori what services

      will be =
available upon connection. 

   o  The user has multiple =
sets of credentials.  Where no

      =
preconfiguration exists, it is possible that the user will

      not be able to =
determine which credentials to use with which

      attachment =
point, or even whether any credentials it possesses

      will allow it =
to authenticate successfully.  An

      identity and =
associated credentials can be usable for authentication

      with multiple =
networks, and not all of these networks will be

      =
preconfigured.  For example, the user could have one set of 

      credentials =
from  a public service provider and  another set 

      from an =
employer, and a network might enable authentication

      with one or =
more of these credentials.  Yet, without

      =
preconfiguration, multiple unsuccessful authentication attempts 

      could be =
needed for each attachment point in order to determine

      what =
credentials are usable, wasting valuable time and 

      resulting in =
user frustration.   In order to choose between multiple 

      attachment =
points, it can be helpful to provide additional 

      information to =
enable the correct credentials to be =
determined.

   o  There are multiple =
potential roaming paths between the visited

      realm and the =
user's home realm, and service parameters or pricing

      differs =
between them.  In this situation, there could be multiple

      ways for the =
user to successfully authenticate using the same 

      identity and =
credentials, yet the cost of each approach might

      differ. In =
this case, the access network may not be

      able to =
determine the roaming path that best matches the user's

      =
preferences.  This can lead to the user being charged more than

      necessary, or =
not obtaining the desired services.  For example,

      the visited =
access realm could have both a direct relationship

      with the home =
realm and an indirect relationship through a roaming

      =
consortium.  Current Authentication, Authorization and =
Accounting

      (AAA) =
protocols may not be able to route the access request to the

      home AAA sever =
purely based on the realm within the Network Access

      Identifier =
(NAI) [RFC4282].  In addition, payload packets can be

      routed or =
tunneled differently, based on the roaming relationship

      path.  =
This may have an impact on the available services or their

      =
pricing.

   In Section 2 the network =
discovery and selection problem is defined

   and divided into =
subproblems.  Some solution constraints are outlined

   in Section 3.  Section 4 =
provides conclusions and suggestions for

   future work.  Appendix A =
discusses existing solutions to portions of

   the =
problem."
A New Internet-Draft is available from the on-line Internet-Drafts 
directories.

	Title		: TLS using EAP Authentication
	Author(s)	: Y. Nir, et al.
	Filename	: draft-nir-tls-eap-00.txt
	Pages		: 20
	Date		: 2007-6-11

   This document describes an extension to the TLS protocol to allow TLS
   clients to authenticate with legacy credentials using the Extensible
   Authentication Protocol (EAP).

   This work follows the example of IKEv2, where EAP has been added to
   the IKEv2 protocol to allow clients to use different credentials such
   as passwords, token cards, and shared secrets.

   When TLS is used with EAP, additional records are sent after the
   ChangeCipherSpec protocol message and before the Finished message,
   effectively creating an extended handshake before the application
   layer data can be sent.  Each EapMsg handshake record contains
   exactly one EAP message.  Using EAP for client authentication allows
   TLS to be used with various AAA back-end servers such as RADIUS or
   Diameter.

   TLS with EAP may be used for securing a data connection such as HTTP
   or POP3.  We believe it has three main benefits:
   o  The ability of EAP to work with backend servers can remove that
      burden from the application layer.
   o  Moving the user authentication into the TLS handshake protects the
      presumably less secure application layer from attacks by
      unauthenticated parties.
   o  Using mutual authentication methods within EAP can help thwart
      certain classes of phishing attacks.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-nir-tls-eap-00.txt

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Subject:	I-D ACTION:draft-nir-tls-eap-00.txt
Date:	Mon, 11 Jun 2007 15:50:02 -0400
From:	Internet-Drafts@ietf.org
Reply-To:	internet-drafts@ietf.org
To:	i-d-announce@ietf.org

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