[OpenAFS] host principal and keytab

Andrew Bacchi bacchi@rpi.edu
Mon, 07 Jan 2008 13:18:21 -0500

The PTS entry is the part I missed so far.  To clarify, the K4 principal
should look like rcmd.server@REALM, not rcmd.server.rpi.edu@REALM, correct?

Jeffrey Altman wrote:
> Andrew Bacchi wrote:
>> I need to allow hosts to read/write files into AFS directories.  I 
>> currently have a host principal as host/server.rpi.edu, and I 
>> extracted a keytab file for it as /etc/krb5.keytab.
>> This is not working, so I must be missing something.  How do I get AFS 
>> tokens using krb5.keytab? There is some AFS form to the principal in 
>> kerberos 5 that I haven't mapped correctly.
> Several things:
> (1) you must create a PTS entry that matches the service principal.
>     (see note below)
> (2) you must obtain a Kerberos TGT using the keytab
> (3) you must set a token using that TGT with aklog
> Note that AFS does not currently have a notion of an identity for the 
> cache manager and given the fact that the principal names must be 
> converted to krb4 format the PTS entry for host/server.rpi.edu@REALM 
> will become rcmd.server@REALM when performing lookups in the PTS database.
> There is nothing that will distinguish this AFS ID as a machine ID. When 
> it is being used, the process will be a member of system:authuser.

veritatis simplex oratio est

Andrew Bacchi
Systems Programmer
Information Technologies Infrastructure
Rensselaer Polytechnic Institute
phone: 518.276.6415  fax: 518.276.2809