Re: [NFS] NFS/krb and batch jobs - doable?

[raini-9HxftnAiGddWk0Htik3J/w@public.gmane.org]

Jeff Layton <jlayton@redhat.com> said:
>> Just to be clear - you mean doable to a coder who might like to improve
>> on
>> gssd/kernel credential separation, rather than a non-coding sysadmin who
>> needs with work within the current NFS/gssd framework?
>>
>
> Correct, that's what I mean. It'll mean modifying kernel and rpc.gssd
> code.

Thanks for confirming.  Skipping back a little:

>> > No, gssd (the client side daemon) will search /tmp for anything that
>> > looks like a credcache for the right user, verify that it is a
>> > credcache and then pick the one with the latest TGT expiration.

Kevin Coffman on the NFS4 list actually implied this used simple mtime
rather than actually scanning /tmp/krb5cc_uid* for ccache files with the
latest TGT expiration, which is how I originally read your statement. 
This seemingly would make a difference in an environment with a batch job
with a long lifetime ticket and subsequent interactive login generating a
separate ccache file with a shorter lifetime but newer mtime.

I'm not a coder but I scanned krb5_util.c in the gssd code, and it *seems*
to me it only looks at mtime, although what you suggest would be more
optimal.  Could you confirm whether it's scanning ccache files for longest
TGT, or just using mtime?