[OpenAFS] krb5 trust, rxkad error=19270408... I'm missing something

[Jeffrey Altman]

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At this point I think a debugger needs to be attached
to a service so that we can determine why rxkad is reporting
a key version number error.

Jeffrey Altman



On 3/5/2010 12:36 PM, Stephen Joyce wrote:
> A lil' bit more testing, but no solution yet.
>=20
> Extracted a new keytab on 2008R2 per Jeff's suggestion. I omitted the
> kvno flag, and repeated extraction until I got a kvno of sufficient
> value not to interfere with existing keys.
>=20
> For ktpass:
> -crypto ALL creates a keytab with DES-CBC-CRC, DES-CBC-MD5, RC4-HMAC,
> AES256-SHA1, AND AES128-SHA1 ciphers despite specifying +DesOnly (and
> previously checking the des only flag under account properties).
>=20
> +SetUpn is the default for ktpass in 2008R2. The Upn is set to
> afs/cell.name. I also tried using afs/cell.name@AD.DOMAIN, but could no=
t
> aklog with that value.
>=20
> The new keytab, when installed (and the former removed), shows the same=

> results as before: kinit and aklog work, but AFS doesn't accept the
> tickets despite the fact that the key is in the keyfile in the correct
> slot for the kvno. afs/cell@AD keytab is DES, kvno is identical in all
> locations...
>=20
> Possibly unrelated, but I've tried modifying krb5.conf on the test
> client to disable all but DES-DBC-CRC, but when the krbtgt for the
> 2008R2 domain in the ccache is DES, aklog fails with Kerberos error
> -1765328343. If I make the same change on a client in our production
> setup, aklog still works fine.
>=20
> google suggested verifying the kvno in AD by examining
> msDs-KeyVersionNumber in ADSI. I can't find that attribute vi ADSI in
> 2008. But since I'm no longer specifying -kvno, and it's incrementing o=
n
> each iteration, presumably wherever the 2008 schema stores the kvno,
> it's correct.
>=20
> Any other ideas welcomed.
>=20
> Cheers, Stephen
> --=20
> Stephen Joyce
> Systems Administrator
> PANIC - Physics and Astronomy Network Infrastructure and Computing
> University of North Carolina at Chapel Hill voice: 919.962.7214
> fax: 919.962.0480
>=20
> On Thu, 4 Mar 2010, Jeffrey Altman wrote:
>=20
>> On 3/4/2010 10:56 PM, Stephen Joyce wrote:
>>> On Thu, 4 Mar 2010, Jeffrey Altman wrote:
>>>
>>>> [C:\]translate_et 19270408
>>>> 19270408 =3D ticket contained unknown key version number
>>>>
>>>> What does kvno report when using the regular user?
>>>> Is it still three?  My guess is not.
>>>
>>> After a kinit on a client (to a regular user account in AD), the kvno=
 of
>>> afs/cellname@ADDOMAIN is still 3.
>>
>> well, the error is unknown kvno.  either the kvno in the service ticke=
t
>> is not 3 or there is no kvno entry for 3 in the KeyFile.
>>
>> Unfortunately, there is no mechanism for logging errors from within
>> the rxkad security class.  The best you can do is attach a debugger
>> to a service that you are connecting to and place a break point at
>> each of the two locations where RXKADUNKNOWNKEY is set as the error
>> code.
>>
>>
>>
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>=20



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