There were cases where we weren't negotiating SANON where we should
have. But we really don't want to overdo it. In particular we really
never ever want a user with expired or absent Kerberos credentials (say)
to accidentally negotiate SANON as that will then lead to authorization
errors down the line, and those would be hard to diagnose as they would
be masking the real issue (expired or absent credentials).
So basically either the user passes GSS_C_ANON_FLAG or (and/or) they
call gss_set_neg_mechs() to explicitly request SANON.
Partly authored by me, partly authored by Claude with heavy human
guidance, and reviewed by me.
10be6a75c4