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Re: [CHANNEL-BINDING] [sasl] Updates to draft-altman-tls-channel-bindings, take two (PLEASE REVIEW)

Nicolas Williams <Nicolas.Williams@sun.com> Tue, 23 March 2010 19:07 UTC

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Date: Tue, 23 Mar 2010 14:06:29 -0500
From: Nicolas Williams <Nicolas.Williams@sun.com>
To: channel-binding@ietf.org, sasl@ietf.org, tls@ietf.org, Mark Novak <Mark.Novak@microsoft.com>, Larry Zhu <lzhu@wollive.windowsmedia.com.akadns.net>
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Cc: Pasi Eronen <pasi.eronen@nokia.com>
Subject: Re: [CHANNEL-BINDING] [sasl] Updates to draft-altman-tls-channel-bindings, take two (PLEASE REVIEW)
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On Tue, Mar 23, 2010 at 01:53:01AM -0500, Nicolas Williams wrote:
> On Mon, Mar 22, 2010 at 06:21:50PM -0500, Nicolas Williams wrote:
> > I've posted -08 of draft-altman-tls-channel-bindings:
> 
> I forgot to describe the synchronization problem that Simon pointed out,
> as well as the solution.
> 
> I'll file -09 tomorrow.

Submitted:

http://www.ietf.org/id/draft-altman-tls-channel-bindings-09.txt

Larry, Mark,

It occurs to me that it must be very unlikely that any apps using the
MSFT variant of tls-unique are doing authentication after TLS
re-negotiation.  We already have confirmation that in the HTTP/Negotiate
case that never happens.  If so, might you be willing to fix your
implementation to always use the initial handshake?  That would help
remove two pieces of complexity from -09: a) security considerations with
regard to the TLS re-negotiation bug, b) interoperability considerations
with regard to the channel binding synchronization problem.

Nico
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