Daniel, I have the current code, docs and autoconf scripts and there is a lot of room. It is quite a mess with the terms, defines and documenation. This needs to be cleaned up and updated. Some stuff in the header files needs to be renamed/redefined to match proper naming and old stuff needs to be deprecated.

The best thing is to clone from Github repo and issue a pull request when I am done.

What do you think?

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** [bugs:#1302] HTTP Auth Negotiate sends Kerberos token instead of SPNEGO token**
**Status:** open
**Created:** Wed Nov 13, 2013 12:07 PM UTC by Michael Osipov
**Last Updated:** Sat Dec 07, 2013 07:33 PM UTC
**Owner:** Daniel Stenberg
When a server challenges a client with 'WWW-Authenticate: Negotiate', it expects a SPNEGO token. Unfortunately, curl needs to be compiled with fbopenssl for this. If you compile with GSS-API only it generates a Kerberos 5 token in lib/curl_gssapi.c line 64, NO_OID. This makes the implemenation select a default mech (namely KRB 5).
For HTTP this can be easily patched with something like this: http://code.google.com/p/serf/issues/attachmentText?id=89&aid=890000000&name=serf-spnego.patch&token=_HwqdhFej2jHi5_6V0XTh311VPM%3A1351042419228
My locally patched version works as desired. The function Curl_gss_init_sec_context is used in several spots, so if someone really needs Kerberos instead of SPNEGO another argument for passing the OID is necessary (FTP, SOCKS). With that change, fbopenssl is redundant and can be completely removed.
If not a wrapped SPNEGO token is send, an acceptor can react with:
GSSException: No credential found for: 1.2.840.113554.1.2.2 usage: Accept
        at sun.security.jgss.GSSCredentialImpl.getElement(GSSCredentialImpl.java:577)
        at sun.security.jgss.GSSContextImpl.acceptSecContext(GSSContextImpl.java:317)
        at sun.security.jgss.GSSContextImpl.acceptSecContext(GSSContextImpl.java:285)
I have reported the very same issue with Subversion and libserf: http://code.google.com/p/serf/issues/detail?id=89
The SSPI version does not suffer from this because "Negotiate" is passed to AcquireCredentialsHandle.
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