krb5_rd_req() server argument should be optional

[Nicolas Williams]

Yes, I have a need for a form of krb5_rd_req() whose server princ name
argument is optional and, if not provided, is obtained straight from the
decoded AP-REQ and returned to the caller.

This probably means a new API call based on rd_req() with a server
argument that is a pointer to a krb5_principal, and this function will
have to search the given keytab for a key for the principal name
extracted from the AP-REQ.

This, I think, is how rd_req() should have worked from the get-go.

Similarly the verify_creds() function should have an optional service
principal argument which, if not given, should cause verify_creds() to
try every SPN given in the keytab.

In either case the caller could check the actual SPN used and would take
that into account, if applicable, in any authorization decisions.

Would such a feature be welcome?

Comments?

Nico
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