[37178] in Kerberos
Re: Cannot authenticate with client keytab and AES128/256 against
daemon@ATHENA.MIT.EDU (Osipov, Michael)
Wed Jul 29 18:02:10 2015
From: "Osipov, Michael" <michael.osipov@siemens.com>
To: Greg Hudson <ghudson@mit.edu>, "kerberos@mit.edu" <kerberos@mit.edu>
Date: Wed, 29 Jul 2015 22:01:57 +0000
Message-ID: <68644224DA0DE64CA5A49838ED219A0425A98C2A@DEFTHW99EJ5MSX.ww902.siemens.net>
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> On 07/29/2015 07:43 AM, Osipov, Michael wrote:
> > add_entry -password -p osipovmi@COMAPNY.NET -k 1 -e
> > aes256-cts-hmac-sha1-96 add_entry -password -p osipovmi@COMAPNY.NET -k
> > 1 -e aes128-cts-hmac-sha1-96 add_entry -password -p
> > osipovmi@COMAPNY.NET -k 1 -e arcfour-hmac
> [...]
> > kinit: Invalid argument while getting initial credentials
>
> Your primary problem here has to do with salts. From the trace logs you provided
> me, the salt string for this principal was constructed using the principal name
> michael.osipov@COMAPNY.NET (not the actual realm name), not
> osipovmi@COMAPNY.NET. ktutil unfortunately has no way to specify the salt
> string or to retrieve it from the KDC; it can only use the default salt for the principal
> name when adding a keytab entry using a password. The RC4 enctype does not
> use the salt, so you don't encounter this problem when using only an RC4 key.
>
> I believe that people generally have better luck with msktutil for creating keytabs
> for use with Active Directory; it may solve this problem.
>
> The secondary problem is that you are getting the error message "Invalid
> argument" instead of something more accurate, like "Password incorrect"
> or "Preauthentication failed." I don't know the exact cause of this problem yet,
> though I believe it has to do with our PKINIT code.
After some research I have stumbled upon this thread: http://kerberos.996246.n3.nabble.com/ktutil-problems-generating-AES-keys-salt-td41104.html
This is the exact same problem I have. Greg, you have already mentioned back then it would be nice to provide a custom salt.
Nonetheless, Mark Pröhl provided a workaround for this. Annoying, but I was able to obtain a TGT and kinit.trace looks good now.
For the shortcomings in msktutil, I will contact Mark and see how we can improve that stuff.
Regarding ktutil, I'd love to see the AS-REQ to look up the salt but I would already be happy with a -salt switch.
Do you think we could get this in a foreseeable future?
Michael
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