Re: Agenda items to discuss

"Jeffrey Altman [Kermit Project Volunteer]" <jaltman@columbia.edu> Wed, 29 October 2003 23:44 UTC

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Date: Wed, 29 Oct 2003 18:44:26 -0500
From: "Jeffrey Altman [Kermit Project Volunteer]" <jaltman@columbia.edu>
Reply-To: ietf-sasl@imc.org
Organization: Columbia University in the City of New York
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To: Nicolas Williams <Nicolas.Williams@Sun.COM>
CC: Sam Hartman <hartmans@mit.edu>, ietf-sasl@imc.org
Subject: Re: Agenda items to discuss
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Nicolas Williams wrote:

>On Wed, Oct 29, 2003 at 01:44:05PM -0500, Sam Hartman wrote:
>  
>
>>* There was some discussion of multiple layers of encryption (TLS vs security layers) in XMPP; do we want
>>to develop guidance for protocol designers on this issue?
>>    
>>
>
>I think this should be discussed.
>
>I think the guidance we want to give is: don't delegate session
>protection from one layer to another without confirming that the
>end-points at both layers are the same.
>
>See:
>
>http://www.ietf.org/internet-drafts/draft-ietf-nfsv4-channel-bindings-00.txt
>
>
>It would be nice if SASL had a channel bindings facility.  Such a
>facility could be added or applications could be encouraged to exchange
>channel bindings data integrity protected at the SASL layer.
>
>Can GSS-API channel bindings facility be used when using the GSS-* SASL
>mechanisms?
>
>Cheers,
>
>Nico
>  
>
I second this sentiment.  We need to provide advice on how the 
underlying session security can be validated as part of the SASL 
authentication OR after the authentication by exchanging messages using 
the SASL Security Layer which can be then be turned off if validation 
was successful.

Jeffrey Altman