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Re: [kitten] draft-perez-krb-wg-gss-preauth

Greg Hudson <ghudson@mit.edu> Mon, 02 August 2021 16:23 UTC

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To: Luke Howard <lukeh=40padl.com@dmarc.ietf.org>, "kitten@ietf.org" <kitten@ietf.org>
Cc: Alejandro Perez Mendez <alex@um.es>
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From: Greg Hudson <ghudson@mit.edu>
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Date: Mon, 2 Aug 2021 12:23:24 -0400
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Subject: Re: [kitten] draft-perez-krb-wg-gss-preauth
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On 8/1/21 9:37 AM, Luke Howard wrote:
> I’m working on an implementation
> of draft-perez-krb-wg-gss-preauth-02.txt for Heimdal.
> 
> Is this something the working group would consider adopting?

I'm not writing to support adoption, but I did have a note on the draft.
 PA-GSS contains a state object which has similar protections as is
needed for PA-FX-COOKIE (see
https://web.mit.edu/kerberos/krb5-latest/doc/formats/cookie.html
and note the additional binding of the client principal to the cookie
encryption key).  It might facilitate sharing to just handle the state
via PA-FX-COOKIE rather than baking it into the preauth mech.

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