Daniel, I think I can provide a patch but this will need some time because I am not really C proficient. Anyway, this will require to change the configure scripts, C files, header files and add some defines. This will also require a least minimum version of Heimdal or MIT to work but this native feature has been avaiable for many years in both.

Moreover, I can provide to test that stuff on RHEL, FreeBSD and HP-UX if you like.

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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 07:22 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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