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This pull request combines SimonWilkinson/gss-openssh#2 with painless-security/gss-openssh#1. @hartmans requested I submit it here.
Previously, OpenSSH required that mechanisms be registered in a static table within the ssh server. There are three reasons for this:
Since then the GSS-API vendors have added support for gss_localname and gss_userok. In addition, mechanism attributes allow sshd to probe for which mechanisms meet the requirements from RFC 4462.
Add support for arbitrary GSS-API mechanisms using gss_localname and gss_userok. Filter out negotiation mechanisms.
Also includes fixes for compiling against GSSAPI that doesn't (yet) have gss_userok() or gss_indicate_mechs_by_attrs().