RFC 4121 & acceptor subkey use in MIC token generation

[Nico Williams]

On Wed, Oct 25, 2023 at 08:51:29AM -0400, Ken Hornstein wrote:
> I think we've lost the thread here; I do not think that any krb5
> mechanism today ever asserts PROT_READY before GSS_S_COMPLETE, but I
> would love to be proven wrong.

That's the whole point of being able to use the initiator sub-session
key: to allow the Kerberos GSS mechanism to assert PROT_READY on the
first call to GSS_Init_sec_context() even when mutual auth is requested.

Yes, RFC 4121 didn't say so, but it's the point.

Nico
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