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Re: [kitten] Checking the transited list of a kerberos ticket in a transitive cross-realm trust situation...

Viktor Dukhovni <viktor1dane@dukhovni.org> Thu, 24 August 2017 20:47 UTC

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From: Viktor Dukhovni <viktor1dane@dukhovni.org>
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Date: Thu, 24 Aug 2017 16:47:01 -0400
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References: <f33d5f68-1fdc-c1bc-c702-70b054880bb4@samba.org> <649fa812-aacf-80b6-1976-a719eca60fc2@mit.edu> <33c431f5-c36b-c321-de3f-65977d8aa898@samba.org> <007c29e8-02b9-4f48-f67e-881cb0985d64@mit.edu> <69d80d24-d461-1652-3cfb-e55d90d31fbf@samba.org> <ec067a72-313e-1878-33a0-a3259d2979d5@mit.edu> <1503578184.3428.19.camel@redhat.com> <db882372-aa1d-e58e-4c94-a268539bd2ee@samba.org> <1503596189.3428.26.camel@redhat.com>
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Subject: Re: [kitten] Checking the transited list of a kerberos ticket in a transitive cross-realm trust situation...
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[ Just kitten, as either not subcribed or subscribed with a different
  address to some of the other lists. ]

> On Aug 24, 2017, at 1:36 PM, Simo Sorce <simo@redhat.com> wrote:
> 
>> We should enforce a PAC always to be present, as we don't support
>> trusted domains with LSA_TRUST_TYPE_MIT anyway.
> 
> In samba, yes, but that option can be used in other clients that can
> connect to multiple types of servers so in case they do not get a PAC
> the flag should be respected.

Does the Kerberos library know whether whether the application is going
to look at PACs and SIDs or just use the client principal name?  I am
guessing it does not.  Thus in Samba, one might need a dedicated
krb5.conf configuration file that disables the transit check.  Other
applications should still apply transit check even if a PAC happens
to be present, as AFAIK it may well remain unused.

-- 
	Viktor.

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