Negotiate: fix for HTTP POST with Negotiate

* Adjusted unit tests 2056, 2057
* do not generally close connections with CURLAUTH_NEGOTIATE after every request
* moved negotiatedata from UrlState to connectdata
* Added stream rewind logic for CURLAUTH_NEGOTIATE
* introduced negotiatedata::GSS_AUTHDONE and negotiatedata::GSS_AUTHSUCC
* Consider authproblem state for CURLAUTH_NEGOTIATE
* Consider reuse_forbid for CURLAUTH_NEGOTIATE
* moved and adjusted negotiate authentication state handling from
  output_auth_headers into Curl_output_negotiate
* Curl_output_negotiate: ensure auth done is always set
* Curl_output_negotiate: Set auth done also if result code is
  GSS_S_CONTINUE_NEEDED/SEC_I_CONTINUE_NEEDED as this result code may
  also indicate the last challenge request (only works with disabled
  Expect: 100-continue and CURLOPT_KEEP_SENDING_ON_ERROR -> 1)
* Consider "Persistent-Auth" header, detect if not present;
  Reset/Cleanup negotiate after authentication if no persistent
  authentication
* apply changes introduced with #2546 for negotiate rewind logic

Fixes #1261
Closes #1975

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/url.c b/lib/url.c
index 76e912231..e67def5fc 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -806,6 +806,10 @@ CURLcode Curl_disconnect(struct Curl_easy *data,
   /* Cleanup NTLM connection-related data */
   Curl_http_ntlm_cleanup(conn);
 #endif
+#if !defined(CURL_DISABLE_HTTP) && defined(USE_SPNEGO)
+  /* Cleanup NEGOTIATE connection-related data */
+  Curl_cleanup_negotiate(conn);
+#endif
 
   /* the protocol specific disconnect handler and conn_shutdown need a transfer
      for the connection! */