OpenSSH: Password/Key + Kerberos Authentification

Dear Sir,

we would like to set up a sshd such that it accepts both the usage of passwords and keys as well as kerberos tickets. The idea is that users trying to connect get accepted if a) they have a valid kerberos ticket
 or
b) their key is stored in authorized_keys  or
c) they enter a valid password

We have been trying to set this up but got only that far that as soon as Kerberos tickets were used as authentification method, nomal passoword/key login was no longer possible.

The machine runs under a RedHad based Linux, Vanilla kernel 2.4.20 from kernel.org and
OpenSSh version SSH-2.0-OpenSSH_3.5p1f1 is used.

Any hint how to set this up would be most welcome.

Kind regards,

Ulrich

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