[OpenAFS] Initial setup "rxk: security object was passed a bad ticket"

[Jeffrey Altman]

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Assarsson, Emil wrote:
> Hi all,
> 
> KDC: Microsoft Active Directory 2008
> AFS server OS: Ubuntu 9.10
> OpenAFS version: 1.4.11+dfsg-1 (distributed version)
> 
> Admin and service account are AD accounts.
> I created the service user as a regular user and 

good

> checked the option "use DES encryption types for this account"

good

> I created the keytab with ktutil:

use Microsoft's ktpass to set the password on the service account
and create the keytab.

> rxk: security object was passed a bad ticket

Unfortunately, there is no good debugging information available from an
rx security class.  A krb5 related bad ticket error can be generated for
many reasons:

1 krb5 ticket length greater than 12000 bytes

2 krb5 cipher length not a multiple of 8

3 a failure to decrypt the ticket because the key in the keytab
  with the matching kvno is wrong.

4 a failure to decode the encrypted ticket part

5 a null component is present in the principal name

6 the principal name has more than two components

7 the principal name has a dot in the first component and the
  dot check is not disabled

8 the session key type is something other than DES-CBC-{CRC,MD4,MD5}

9 the session key length is not 8

The most likely issues are 1, 3, 7, and 8.

To address 1 the NO_AUTH_DATA_REQUIRED flag should be set on the AFS
service account.  See http://support.microsoft.com/kb/832572/

To address 3 generate the keytab using ktsetup

To address 7 either do not use principals with dots in the first
component or turn disable the check from the command line of each afs
service.

To address 8 make sure that "use DES" is set for the AFS service and
each of the user accounts that will be accessing AFS.

Jeffrey Altman
Secure Endpoints Inc.


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