[OpenAFS] host principal and keytab

[Jeffrey Altman]

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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.



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