The users don't have permission to log in interactively on the servers in question, and it's rather important to the security model that this should remain the case.
I don't think PAM is any help to me here since as I understand it, there is no mechanism to pass PAM the user's existing credentials, for it to pass on in turn to the kerberos libraries.
From reading around I think the answer involves GSSAPI, which there is a CPAN module for but which will take me some time to digest!
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