Re: [secdir] secdir review of draft-ietf-sasl-gs2-17
Simon Josefsson <simon@josefsson.org> Fri, 08 January 2010 12:49 UTC
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From: Simon Josefsson <simon@josefsson.org>
To: Nicolas Williams <Nicolas.Williams@sun.com>
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Date: Fri, 08 Jan 2010 13:49:53 +0100
In-Reply-To: <20091123165233.GJ773@Sun.COM> (Nicolas Williams's message of "Mon, 23 Nov 2009 10:52:34 -0600")
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Cc: secdir@ietf.org, 'Kurt Zeilenga' <Kurt.Zeilenga@Isode.com>, iesg@ietf.org, 'Alexey Melnikov' <alexey.melnikov@Isode.com>
Subject: Re: [secdir] secdir review of draft-ietf-sasl-gs2-17
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Nicolas Williams <Nicolas.Williams@sun.com> writes: >> SECTION 5 >> I find this section rather difficult to understand: not all of the possible >> combinations of gs2-cb-flag and server support for channel bindings seem to >> be covered. A table might help, if not for that the gs2-cb-flag is >> tri-valued & used to signal two different things. > > I believe we handled all cases. There are three flag values and two > server support alternatives. I suppose we can add a table, something > like: > > FLAG SERVER CB SUPPORT DISPOSITION > ---- ----------------- ----------- > > n Irrelevant If server disallows non-channel- > bound authentication, then fail > > y CB not supported Authentication may succeed > > y CB supported Authentication must fail > > p CB supported Authentication may succeed, with > CB used > > p CB not supported Authentication will fail > > <none> CB not supported Client does not even try because > it insists on CB I have added this table to section 5. >> The first paragraph says: >> >> GS2 does not use any GSS-API per-message tokens. Therefore the >> setting of req_flags related to per-message tokens is irrelevant. >> >> OK, but what should the client and server behavior should be WRT the flags? > > There's no actual behavior w.r.t. req_flags and ret_flags. The GSS-API > mechanism is free to enable per-msg token features not requested by the > caller, but they are truly irrelevant: the application won't be using > per-msg tokens. It may make things simpler if we explicitly require > that req_flags not be set: > > GS2 does not use any GSS-API per-message tokens. Therefore the > per-message token ret_flags from GSS_Init_sec_context() and > GSS_Accept_sec_context() are irrelevant; implementations SHOULD NOT > set the per-message req_flags. This is in the document now too. Thanks, Simon
- [secdir] secdir review of draft-ietf-sasl-gs2-17 Glen Zorn
- Re: [secdir] secdir review of draft-ietf-sasl-gs2… Nicolas Williams
- Re: [secdir] secdir review of draft-ietf-sasl-gs2… Alexey Melnikov
- Re: [secdir] secdir review of draft-ietf-sasl-gs2… Simon Josefsson
- Re: [secdir] secdir review of draft-ietf-sasl-gs2… Simon Josefsson