cross-realm auth (sort of...)

[Måns Nilsson <mansaxel@sunet.se>]

Suppose I am a host /outside/ a domain. 

I would like to verify that an user from that domain has a valid ticket. Is
there a simple method of checking the status of a ticket (expiredness,
actual validity of the ticket) from this outside position? 

It does not matter who I am, I'm just interested in verifying that the
entity presenting a ticket for luser@REALM is really giving me a good
ticket (and thus could be regarded as actually being luser@REALM) and the
ticket still is valid.

suggestions? 
-- 
Måns Nilsson            Systems Specialist
+46 70 681 7204         KTHNOC
                        MN1334-RIPE