[24245] in Kerberos

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Re: Updating encryption types

daemon@ATHENA.MIT.EDU (Phil Dibowitz)
Thu Jul 7 20:30:48 2005

Date: Thu, 7 Jul 2005 17:30:07 -0700
From: Phil Dibowitz <phil@usc.edu>
To: Kevin Coffman <kwc@citi.umich.edu>, kerberos@mit.edu,
        Toan Nguyen <toan@usc.edu>
Message-ID: <20050708003007.GY8907@usc.edu>
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	Toan Nguyen <toan@usc.edu>
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On Thu, Jul 07, 2005 at 02:22:59PM -0700, Phil Dibowitz wrote:
> On Wed, Jul 06, 2005 at 07:21:17PM -0400, Kevin Coffman wrote:
> > My guess is that your krbtgt/ISD.ISC.EDU@ISD.USC.EDU principal still
> > only has a des key.  'cpw -randkey -keepold' on that principal to
> > generate other keys.
>=20
> Nice. That works. I didn't realize that had to be updated. Which leaves me
> with a few more questions:
>=20
> 1. What's the difference between the principals krbtgt@ISD.USC.EDU and
> krbtgt/ISD.USC.EDU@ISD.USC.EDU ? They both exist, but krbtgt/ISD.USC.EDU =
seems
> to be the ACTUAL ticket granting principal, while krbtgt@ISD.USC.EDU has =
the
> DISALLOW_ALL_TIX attribute.=20

OK, so going back, I find that

krbtgt/ISD.USC.EDU@ISD.USC.EDU is for crossrealm trust.
krbtgt@ISD.USC.EDU was our original tgt.

However, now all tickets seem to be coming from
krbtgt/ISD.USC.EDU@ISD.USC.EDU. Now the person who setup
krbtgt/ISD.USC.EDU@ISD.USC.EDU and the cross-realm trust was 2 admins ago -
did they make a mistake, or is this a bug in kerb, or is this expected
behavior?

In other words, my klist looks like this:

[phil@frantic phil]$ klist
Ticket cache: FILE:/tmp/krb5cc_36070
Default principal: phil@ISD.USC.EDU

Valid starting     Expires            Service principal
07/07/05 14:34:25  07/08/05 00:34:23  krbtgt/ISD.USC.EDU@ISD.USC.EDU
[phil@frantic phil]$=20


But I would think it SHOULD look like this:

[phil@frantic phil]$ klist
Ticket cache: FILE:/tmp/krb5cc_36070
Default principal: phil@ISD.USC.EDU

Valid starting     Expires            Service principal
07/07/05 14:34:25  07/08/05 00:34:23  krbtgt@ISD.USC.EDU
[phil@frantic phil]$=20

I get the eerie feeling that this is due to a misconfiguration of our
cross-realm trust...

Hmmm.

--=20
Phil Dibowitz
Systems Architect and Administrator
Enterprise Infrastructure / ISD / USC
UCC 180 - 213-821-5427


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