Re: [kitten] RFC2743 errata 4251
mrex@sap.com (Martin Rex) Mon, 15 December 2014 21:59 UTC
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Date: Mon, 15 Dec 2014 22:59:39 +0100
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From: mrex@sap.com
Archived-At: http://mailarchive.ietf.org/arch/msg/kitten/jEBz0YfyOev6tGlVdfIQaaH0W_8
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Subject: Re: [kitten] RFC2743 errata 4251
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Sorry, fixing a typo and clarifying. The "early message protection" facilities will only ever succeed for early message protection (gss_wrap(), gss_getmic()), but will _never_ succeed for early message un-protection (gss_unwrap(), gss_verifymic()). -Martin I wrote: > > Nico Williams wrote: >> On Mon, Dec 15, 2014 at 12:20:30PM -0500, Greg Hudson wrote: >>> On 12/10/2014 01:57 PM, Benjamin Kaduk wrote: >>>> Though future GSS-API extensions may add new uses of asynchronous >>>> security context tokens and ways to process them, applications >>>> using the GSS-API version 2, update 1, should generally call >>>> GSS_Delete_sec_context() after calling GSS_Process_context_token(), >>>> when the latter returns GSS_S_COMPLETE or GSS_S_FAILURE. >>> >>> I don't like the wording of this part. Encouraging applications to >>> assume that context tokens destroy the context essentially closes the >>> door to specifying context tokens which don't. > > GSS_Process_context_token() will typically mark a security context > as "no longer usable" (but leave the context handle itself intact). > It is a "local matter" (read: implementation defined) whether > a gssapi mechanism destroys cryptographic keying material associated > with the security context handle already within GSS_Process_context_token() > or only upon cleanup when GSS_Delete_sec_context() is called. > > > >>> >>> (To be clear: saying that applications must eventually call >>> GSS_Delete_sec_context() is fine; saying that they should do so >>> immediately after a GSS_S_COMPLETE from GSS_Process_context_token() is >>> not fine.) >> >> GSS-APIv2u1 callers can still call GSS_Unwrap(), GSS_VerifyMIC(), and >> GSS_Pseudo_random()[*], and even GSS_Wrap() and GSS_GetMIC() before >> calling GSS_Delete_sec_context(), however, > > You mean calling GSS_Unwrap(), GSS_VerifyMIC(), GSS_Wrap() > GSS_GetMIC() _after_ calling GSS_Delete_sec_context() ? > > Nope. > > That GSS_Unwrap() or GSS_VerifyMIC() still works is at least somewhat > unlikely for "regular" context deletion tokens, but guaranteed ++ to fail for > context error tokens that report a context establishment failure. > > A gssapi mechanism that would have GSS_Wrap() or GSS_GetMIC() work after > processing a context deletion token would be somewhat silly, because > the mechanism knows _reliably_ that there exists noone that could > process the results.
- [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Benjamin Kaduk
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Benjamin Kaduk
- Re: [kitten] RFC2743 errata 4251 Martin Rex
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Benjamin Kaduk
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Benjamin Kaduk
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Benjamin Kaduk
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Benjamin Kaduk
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Greg Hudson
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Greg Hudson
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Greg Hudson
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Martin Rex
- Re: [kitten] RFC2743 errata 4251 Martin Rex
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Martin Rex
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Benjamin Kaduk
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Stephen Farrell
- Re: [kitten] RFC2743 errata 4251 Benjamin Kaduk
- Re: [kitten] RFC2743 errata 4251 Martin Rex
- Re: [kitten] RFC2743 errata 4251 Stephen Farrell
- Re: [kitten] RFC2743 errata 4251 Greg Hudson
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Benjamin Kaduk
- Re: [kitten] RFC2743 errata 4251 Jeffrey Hutzelman
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Benjamin Kaduk
- Re: [kitten] RFC2743 errata 4251 Benjamin Kaduk
- Re: [kitten] RFC2743 errata 4251 Benjamin Kaduk
- Re: [kitten] RFC2743 errata 4251 Nico Williams
- Re: [kitten] RFC2743 errata 4251 Greg Hudson
- Re: [kitten] RFC2743 errata 4251 Jeffrey Hutzelman