Re: [TLS] [sasl] Updates to draft-altman-tls-channel-bindings, take two (PLEASE REVIEW)
Larry Zhu <larry.zhu@microsoft.com> Tue, 23 March 2010 19:56 UTC
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From: Larry Zhu <larry.zhu@microsoft.com>
To: Nicolas Williams <Nicolas.Williams@sun.com>, "channel-binding@ietf.org" <channel-binding@ietf.org>, "sasl@ietf.org" <sasl@ietf.org>, "tls@ietf.org" <tls@ietf.org>, Mark Novak <Mark.Novak@microsoft.com>
Thread-Topic: [TLS] [sasl] Updates to draft-altman-tls-channel-bindings, take two (PLEASE REVIEW)
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Date: Tue, 23 Mar 2010 19:56:19 +0000
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Cc: Pasi Eronen <pasi.eronen@nokia.com>
Subject: Re: [TLS] [sasl] Updates to draft-altman-tls-channel-bindings, take two (PLEASE REVIEW)
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> 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. Should we instead say that the receiver/verifier of the tls-unique binding is encouraged to remember the previous finished structure before re-negotiation. If the synchronization is more than 2 finished messages apart, the auth request is expected to fail. This way we have a solution when the actual need arises, without complicating either the interface or the protocol. Hopefully the burden to implementation is minimal as well. Is that reasonable? -----Original Message----- From: tls-bounces@ietf.org [mailto:tls-bounces@ietf.org] On Behalf Of Nicolas Williams Sent: Tuesday, March 23, 2010 12:06 PM To: channel-binding@ietf.org; sasl@ietf.org; tls@ietf.org; Mark Novak; Larry Zhu Cc: Pasi Eronen Subject: Re: [TLS] [sasl] Updates to draft-altman-tls-channel-bindings, take two (PLEASE REVIEW) 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 -- _______________________________________________ TLS mailing list TLS@ietf.org https://www.ietf.org/mailman/listinfo/tls
- [TLS] Updates to draft-altman-tls-channel-binding… Nicolas Williams
- Re: [TLS] [sasl] Updates to draft-altman-tls-chan… Pasi.Eronen
- Re: [TLS] [sasl] Updates to draft-altman-tls-chan… Dave Cridland
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to dra… Simon Josefsson
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to dra… Nicolas Williams
- Re: [TLS] [sasl] [CHANNEL-BINDING] Updates to dra… Larry Zhu
- Re: [TLS] [sasl] [CHANNEL-BINDING] Updates to dra… Nicolas Williams
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to dra… Nicolas Williams
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to dra… Nicolas Williams
- Re: [TLS] [sasl] [CHANNEL-BINDING] Updates to dra… Alexey Melnikov
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to dra… Alexey Melnikov
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to dra… Simon Josefsson
- Re: [TLS] [CHANNEL-BINDING] Updates to draft-altm… Simon Josefsson
- Re: [TLS] [CHANNEL-BINDING] Updates to draft-altm… Nicolas Williams
- Re: [TLS] [CHANNEL-BINDING] Updates to Martin Rex
- [TLS] Updates to draft-altman-tls-channel-binding… Nicolas Williams
- Re: [TLS] [CHANNEL-BINDING] Updates to draft-altm… Alexey Melnikov
- Re: [TLS] [sasl] Updates to draft-altman-tls-chan… Nicolas Williams
- Re: [TLS] [sasl] Updates to draft-altman-tls-chan… Nicolas Williams
- Re: [TLS] [sasl] Updates to draft-altman-tls-chan… Larry Zhu
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to dra… Nicolas Williams
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to dra… Nicolas Williams
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to dra… Larry Zhu
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to dra… Simon Josefsson
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to dra… Nicolas Williams
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to dra… Nicolas Williams
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to dra… Simon Josefsson
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to dra… Larry Zhu
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to dra… Nicolas Williams
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to Martin Rex
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to Simon Josefsson
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to dra… Nicolas Williams
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to Martin Rex
- Re: [TLS] [CHANNEL-BINDING] [sasl] Updates to Larry Zhu
- [TLS] Avoiding CB sync problem via server-side so… Nicolas Williams
- Re: [TLS] [sasl] Updates to draft-altman-tls-chan… Eliot Lear
- Re: [TLS] [sasl] Updates to draft-altman-tls-chan… Nicolas Williams
- Re: [TLS] [sasl] Updates to draft-altman-tls-chan… Sean Turner