vauth: Moved the Negotiate authentication code to the new vauth directory

Part 1 of 2 - Moved the SSPI based Negotiate authentication code.

7 files changed, 349 insertions, 189 deletions

diff --git a/lib/Makefile.inc b/lib/Makefile.inc
index 566c450c9..67918f2d0 100644
--- a/lib/Makefile.inc
+++ b/lib/Makefile.inc
@@ -22,7 +22,9 @@
 
 LIB_VAUTH_CFILES = vauth/vauth.c vauth/cleartext.c vauth/cram.c         \
   vauth/digest.c vauth/digest_sspi.c vauth/krb5_gssapi.c                \
-  vauth/krb5_sspi.c vauth/ntlm.c vauth/ntlm_sspi.c vauth/oauth2.c
+  vauth/krb5_sspi.c vauth/ntlm.c vauth/ntlm_sspi.c vauth/oauth2.c       \
+  vauth/spnego_sspi.c
+  
 
 LIB_VAUTH_HFILES = vauth/vauth.h vauth/digest.h vauth/ntlm.h
 
diff --git a/lib/Makefile.vc6 b/lib/Makefile.vc6
index 70ae64300..b916a2176 100644
--- a/lib/Makefile.vc6
+++ b/lib/Makefile.vc6
@@ -627,6 +627,7 @@ X_OBJS= \
 	$(DIROBJ)\ntlm.obj \

 	$(DIROBJ)\ntlm_sspi.obj \

 	$(DIROBJ)\oauth2.obj \

+	$(DIROBJ)\spnego_sspi.obj \

 	$(DIROBJ)\vtls.obj \

 	$(DIROBJ)\openssl.obj \

 	$(DIROBJ)\strdup.obj \

diff --git a/lib/http.c b/lib/http.c
index 4b17d1227..7563708ac 100644
--- a/lib/http.c
+++ b/lib/http.c
@@ -54,6 +54,7 @@
 #include "curl_base64.h"
 #include "cookie.h"
 #include "strequal.h"
+#include "vauth/vauth.h"
 #include "vtls/vtls.h"
 #include "http_digest.h"
 #include "curl_ntlm.h"
diff --git a/lib/http_negotiate.h b/lib/http_negotiate.h
index acbbf6ae5..21b7f8834 100644
--- a/lib/http_negotiate.h
+++ b/lib/http_negotiate.h
@@ -33,10 +33,6 @@ CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy);
 
 void Curl_cleanup_negotiate(struct SessionHandle *data);
 
-#ifdef USE_WINDOWS_SSPI
-#define GSS_ERROR(status) (status & 0x80000000)
-#endif
-
 #endif /* USE_SPNEGO */
 
 #endif /* HEADER_CURL_HTTP_NEGOTIATE_H */
diff --git a/lib/http_negotiate_sspi.c b/lib/http_negotiate_sspi.c
index 2d869ae88..c79b55102 100644
--- a/lib/http_negotiate_sspi.c
+++ b/lib/http_negotiate_sspi.c
@@ -29,11 +29,8 @@
 #include "urldata.h"
 #include "sendf.h"
 #include "rawstr.h"
-#include "warnless.h"
-#include "curl_base64.h"
 #include "vauth/vauth.h"
 #include "http_negotiate.h"
-#include "curl_multibyte.h"
 #include "curl_printf.h"
 
 /* The last #include files should be: */
@@ -44,20 +41,13 @@ CURLcode Curl_input_negotiate(struct connectdata *conn, bool proxy,
                               const char *header)
 {
   struct SessionHandle *data = conn->data;
-  BYTE              *input_token = NULL;
-  SecBufferDesc     out_buff_desc;
-  SecBuffer         out_sec_buff;
-  SecBufferDesc     in_buff_desc;
-  SecBuffer         in_sec_buff;
-  SECURITY_STATUS   status;
-  unsigned long     attrs;
-  TimeStamp         expiry; /* For Windows 9x compatibility of SSPI calls */
-  size_t len = 0, input_token_len = 0;
-  CURLcode result;
+  size_t len;
 
-  /* Point to the username and password */
+  /* Point to the username, password, service and host */
   const char *userp;
   const char *passwdp;
+  const char *service;
+  const char *host;
 
   /* Point to the correct struct with this */
   struct negotiatedata *neg_ctx;
@@ -65,11 +55,15 @@ CURLcode Curl_input_negotiate(struct connectdata *conn, bool proxy,
   if(proxy) {
     userp = conn->proxyuser;
     passwdp = conn->proxypasswd;
+    service = data->set.str[STRING_PROXY_SERVICE_NAME];
+    host = conn->host.name;
     neg_ctx = &data->state.proxyneg;
   }
   else {
     userp = conn->user;
     passwdp = conn->passwd;
+    service = data->set.str[STRING_SERVICE_NAME];
+    host = conn->proxy.name;
     neg_ctx = &data->state.negotiate;
   }
 
@@ -80,43 +74,6 @@ CURLcode Curl_input_negotiate(struct connectdata *conn, bool proxy,
   if(!passwdp)
     passwdp = "";
 
-  if(neg_ctx->context && neg_ctx->status == SEC_E_OK) {
-    /* We finished successfully our part of authentication, but server
-     * rejected it (since we're again here). Exit with an error since we
-     * can't invent anything better */
-    Curl_cleanup_negotiate(data);
-    return CURLE_LOGIN_DENIED;
-  }
-
-  if(!neg_ctx->server_name) {
-    /* Check proxy auth requested but no given proxy name */
-    if(proxy && !conn->proxy.name)
-      return CURLE_BAD_FUNCTION_ARGUMENT;
-
-    /* Generate our SPN */
-    neg_ctx->server_name = Curl_auth_build_spn(
-      proxy ? data->set.str[STRING_PROXY_SERVICE_NAME] :
-      data->set.str[STRING_SERVICE_NAME],
-      proxy ? conn->proxy.name : conn->host.name);
-    if(!neg_ctx->server_name)
-      return CURLE_OUT_OF_MEMORY;
-  }
-
-  if(!neg_ctx->output_token) {
-    PSecPkgInfo SecurityPackage;
-    status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *)
-                                                TEXT(SP_NAME_NEGOTIATE),
-                                                &SecurityPackage);
-    if(status != SEC_E_OK)
-      return CURLE_NOT_BUILT_IN;
-
-    /* Allocate input and output buffers according to the max token size
-       as indicated by the security package */
-    neg_ctx->token_max = SecurityPackage->cbMaxToken;
-    neg_ctx->output_token = malloc(neg_ctx->token_max);
-    s_pSecFn->FreeContextBuffer(SecurityPackage);
-  }
-
   /* Obtain the input token, if any */
   header += strlen("Negotiate");
   while(*header && ISSPACE(*header))
@@ -130,124 +87,28 @@ CURLcode Curl_input_negotiate(struct connectdata *conn, bool proxy,
          negotiation mechanisms */
       return CURLE_LOGIN_DENIED;
     }
-
-    /* We have to acquire credentials and allocate memory for the context */
-    neg_ctx->credentials = malloc(sizeof(CredHandle));
-    neg_ctx->context = malloc(sizeof(CtxtHandle));
-
-    if(!neg_ctx->credentials || !neg_ctx->context)
-      return CURLE_OUT_OF_MEMORY;
-
-    if(userp && *userp) {
-      /* Populate our identity structure */
-      result = Curl_create_sspi_identity(userp, passwdp, &neg_ctx->identity);
-      if(result)
-        return result;
-
-      /* Allow proper cleanup of the identity structure */
-      neg_ctx->p_identity = &neg_ctx->identity;
-    }
-    else
-      /* Use the current Windows user */
-      neg_ctx->p_identity = NULL;
-
-    /* Acquire our credientials handle */
-    neg_ctx->status =
-      s_pSecFn->AcquireCredentialsHandle(NULL,
-                                         (TCHAR *) TEXT(SP_NAME_NEGOTIATE),
-                                         SECPKG_CRED_OUTBOUND, NULL,
-                                         neg_ctx->p_identity, NULL, NULL,
-                                         neg_ctx->credentials, &expiry);
-    if(neg_ctx->status != SEC_E_OK)
-      return CURLE_LOGIN_DENIED;
-  }
-  else {
-    result = Curl_base64_decode(header,
-                                (unsigned char **)&input_token,
-                                &input_token_len);
-    if(result)
-      return result;
-
-    if(!input_token_len) {
-      infof(data,
-            "Negotiate handshake failure (empty challenge message)\n");
-
-      return CURLE_BAD_CONTENT_ENCODING;
-    }
-  }
-
-  /* Setup the "output" security buffer */
-  out_buff_desc.ulVersion = SECBUFFER_VERSION;
-  out_buff_desc.cBuffers  = 1;
-  out_buff_desc.pBuffers  = &out_sec_buff;
-  out_sec_buff.BufferType = SECBUFFER_TOKEN;
-  out_sec_buff.pvBuffer   = neg_ctx->output_token;
-  out_sec_buff.cbBuffer   = curlx_uztoul(neg_ctx->token_max);
-
-  /* Setup the "input" security buffer if present */
-  if(input_token) {
-    in_buff_desc.ulVersion = SECBUFFER_VERSION;
-    in_buff_desc.cBuffers  = 1;
-    in_buff_desc.pBuffers  = &in_sec_buff;
-    in_sec_buff.BufferType = SECBUFFER_TOKEN;
-    in_sec_buff.pvBuffer   = input_token;
-    in_sec_buff.cbBuffer   = curlx_uztoul(input_token_len);
-  }
-
-  /* Generate our message */
-  neg_ctx->status = s_pSecFn->InitializeSecurityContext(
-    neg_ctx->credentials,
-    input_token ? neg_ctx->context : NULL,
-    neg_ctx->server_name,
-    ISC_REQ_CONFIDENTIALITY,
-    0,
-    SECURITY_NATIVE_DREP,
-    input_token ? &in_buff_desc : NULL,
-    0,
-    neg_ctx->context,
-    &out_buff_desc,
-    &attrs,
-    &expiry);
-
-  free(input_token);
-
-  if(GSS_ERROR(neg_ctx->status))
-    return CURLE_OUT_OF_MEMORY;
-
-  if(neg_ctx->status == SEC_I_COMPLETE_NEEDED ||
-     neg_ctx->status == SEC_I_COMPLETE_AND_CONTINUE) {
-    neg_ctx->status = s_pSecFn->CompleteAuthToken(neg_ctx->context,
-                                                  &out_buff_desc);
-    if(GSS_ERROR(neg_ctx->status))
-      return CURLE_RECV_ERROR;
   }
 
-  neg_ctx->output_token_length = out_sec_buff.cbBuffer;
-
-  return CURLE_OK;
+  /* Initilise the security context and decode our challenge */
+  return Curl_auth_decode_spnego_message(data, userp, passwdp, service, host,
+                                         header, neg_ctx);
 }
 
 CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy)
 {
   struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
     &conn->data->state.negotiate;
-  char *encoded = NULL;
+  char *base64 = NULL;
   size_t len = 0;
   char *userp;
   CURLcode result;
 
-  result = Curl_base64_encode(conn->data,
-                              (const char*)neg_ctx->output_token,
-                              neg_ctx->output_token_length,
-                              &encoded, &len);
+  result = Curl_auth_create_spnego_message(conn->data, neg_ctx, &base64, &len);
   if(result)
     return result;
 
-  if(!len)
-    return CURLE_REMOTE_ACCESS_DENIED;
-
   userp = aprintf("%sAuthorization: Negotiate %s\r\n", proxy ? "Proxy-" : "",
-                  encoded);
+                  base64);
 
   if(proxy) {
     Curl_safefree(conn->allocptr.proxyuserpwd);
@@ -258,43 +119,15 @@ CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy)
     conn->allocptr.userpwd = userp;
   }
 
-  free(encoded);
+  free(base64);
 
   return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
 }
 
-static void cleanup(struct negotiatedata *neg_ctx)
-{
-  /* Free our security context */
-  if(neg_ctx->context) {
-    s_pSecFn->DeleteSecurityContext(neg_ctx->context);
-    free(neg_ctx->context);
-    neg_ctx->context = NULL;
-  }
-
-  /* Free our credentials handle */
-  if(neg_ctx->credentials) {
-    s_pSecFn->FreeCredentialsHandle(neg_ctx->credentials);
-    free(neg_ctx->credentials);
-    neg_ctx->credentials = NULL;
-  }
-
-  /* Free our identity */
-  Curl_sspi_free_identity(neg_ctx->p_identity);
-  neg_ctx->p_identity = NULL;
-
-  /* Free the SPN and output token */
-  Curl_safefree(neg_ctx->server_name);
-  Curl_safefree(neg_ctx->output_token);
-
-  /* Reset any variables */
-  neg_ctx->token_max = 0;
-}
-
 void Curl_cleanup_negotiate(struct SessionHandle *data)
 {
-  cleanup(&data->state.negotiate);
-  cleanup(&data->state.proxyneg);
+  Curl_auth_spnego_cleanup(&data->state.negotiate);
+  Curl_auth_spnego_cleanup(&data->state.proxyneg);
 }
 
 #endif /* !CURL_DISABLE_HTTP && USE_SPNEGO */
diff --git a/lib/vauth/spnego_sspi.c b/lib/vauth/spnego_sspi.c
new file mode 100644
index 000000000..8bfc61522
--- /dev/null
+++ b/lib/vauth/spnego_sspi.c
@@ -0,0 +1,297 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * RFC4178 Simple and Protected GSS-API Negotiation Mechanism
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#if defined(USE_WINDOWS_SSPI) && defined(USE_SPNEGO)
+
+#include <curl/curl.h>
+
+#include "vauth/vauth.h"
+#include "urldata.h"
+#include "curl_base64.h"
+#include "warnless.h"
+#include "curl_multibyte.h"
+#include "sendf.h"
+
+/* The last #include files should be: */
+#include "curl_memory.h"
+#include "memdebug.h"
+
+/*
+ * Curl_auth_decode_spnego_message()
+ *
+ * This is used to decode an already encoded SPNEGO (Negotiate) challenge
+ * message.
+ *
+ * Parameters:
+ *
+ * data        [in]     - The session handle.
+ * userp       [in]     - The user name in the format User or Domain\User.
+ * passdwp     [in]     - The user's password.
+ * service     [in]     - The service type such as www, smtp, pop or imap.
+ * hostname    [in]     - The host name.
+ * chlg64      [in]     - The optional base64 encoded challenge message.
+ * nego        [in/out] - The Negotiate data struct being used and modified.
+ *
+ * Returns CURLE_OK on success.
+ */
+CURLcode Curl_auth_decode_spnego_message(struct SessionHandle *data,
+                                         const char *user,
+                                         const char *password,
+                                         const char *service,
+                                         const char *host,
+                                         const char *chlg64,
+                                         struct negotiatedata *nego)
+{
+  CURLcode result = CURLE_OK;
+  size_t chlglen = 0;
+  unsigned char *chlg = NULL;
+  PSecPkgInfo SecurityPackage;
+  SecBuffer chlg_buf;
+  SecBuffer resp_buf;
+  SecBufferDesc chlg_desc;
+  SecBufferDesc resp_desc;
+  unsigned long attrs;
+  TimeStamp expiry; /* For Windows 9x compatibility of SSPI calls */
+
+#if defined(CURL_DISABLE_VERBOSE_STRINGS)
+  (void) data;
+#endif
+
+  if(nego->context && nego->status == SEC_E_OK) {
+    /* We finished successfully our part of authentication, but server
+     * rejected it (since we're again here). Exit with an error since we
+     * can't invent anything better */
+    Curl_auth_spnego_cleanup(nego);
+    return CURLE_LOGIN_DENIED;
+  }
+
+  /* Generate our SPN */
+  if(!nego->server_name) {
+    nego->server_name = Curl_auth_build_spn(service, host);
+    if(!nego->server_name)
+      return CURLE_OUT_OF_MEMORY;
+  }
+
+  if(!nego->output_token) {
+    /* Query the security package for Negotiate */
+    nego->status = s_pSecFn->QuerySecurityPackageInfo((TCHAR *)
+                                                      TEXT(SP_NAME_NEGOTIATE),
+                                                      &SecurityPackage);
+    if(nego->status != SEC_E_OK)
+      return CURLE_NOT_BUILT_IN;
+
+    nego->token_max = SecurityPackage->cbMaxToken;
+
+    /* Release the package buffer as it is not required anymore */
+    s_pSecFn->FreeContextBuffer(SecurityPackage);
+
+    /* Allocate our output buffer */
+    nego->output_token = malloc(nego->token_max);
+    if(!nego->output_token)
+      return CURLE_OUT_OF_MEMORY;
+ }
+
+  if(!nego->credentials) {
+    if(user && *user) {
+      /* Populate our identity structure */
+      result = Curl_create_sspi_identity(user, password, &nego->identity);
+      if(result)
+        return result;
+
+      /* Allow proper cleanup of the identity structure */
+      nego->p_identity = &nego->identity;
+    }
+    else
+      /* Use the current Windows user */
+      nego->p_identity = NULL;
+
+    /* Allocate our credentials handle */
+    nego->credentials = malloc(sizeof(CredHandle));
+    if(!nego->credentials)
+      return CURLE_OUT_OF_MEMORY;
+
+    memset(nego->credentials, 0, sizeof(CredHandle));
+
+    /* Acquire our credentials handle */
+    nego->status =
+      s_pSecFn->AcquireCredentialsHandle(NULL,
+                                         (TCHAR *)TEXT(SP_NAME_NEGOTIATE),
+                                         SECPKG_CRED_OUTBOUND, NULL,
+                                         nego->p_identity, NULL, NULL,
+                                         nego->credentials, &expiry);
+    if(nego->status != SEC_E_OK)
+      return CURLE_LOGIN_DENIED;
+
+    /* Allocate our new context handle */
+    nego->context = malloc(sizeof(CtxtHandle));
+    if(!nego->context)
+      return CURLE_OUT_OF_MEMORY;
+
+    memset(nego->context, 0, sizeof(CtxtHandle));
+  }
+
+  if(chlg64 && strlen(chlg64)) {
+    /* Decode the base-64 encoded challenge message */
+    if(*chlg64 != '=') {
+      result = Curl_base64_decode(chlg64, &chlg, &chlglen);
+      if(result)
+        return result;
+    }
+
+    /* Ensure we have a valid challenge message */
+    if(!chlg) {
+      infof(data, "SPNEGO handshake failure (empty challenge message)\n");
+
+      return CURLE_BAD_CONTENT_ENCODING;
+    }
+
+    /* Setup the challenge "input" security buffer */
+    chlg_desc.ulVersion = SECBUFFER_VERSION;
+    chlg_desc.cBuffers  = 1;
+    chlg_desc.pBuffers  = &chlg_buf;
+    chlg_buf.BufferType = SECBUFFER_TOKEN;
+    chlg_buf.pvBuffer   = chlg;
+    chlg_buf.cbBuffer   = curlx_uztoul(chlglen);
+  }
+
+  /* Setup the response "output" security buffer */
+  resp_desc.ulVersion = SECBUFFER_VERSION;
+  resp_desc.cBuffers  = 1;
+  resp_desc.pBuffers  = &resp_buf;
+  resp_buf.BufferType = SECBUFFER_TOKEN;
+  resp_buf.pvBuffer   = nego->output_token;
+  resp_buf.cbBuffer   = curlx_uztoul(nego->token_max);
+
+  /* Generate our challenge-response message */
+  nego->status = s_pSecFn->InitializeSecurityContext(nego->credentials,
+                                                     chlg ? nego->context :
+                                                            NULL,
+                                                     nego->server_name,
+                                                     ISC_REQ_CONFIDENTIALITY,
+                                                     0, SECURITY_NATIVE_DREP,
+                                                     chlg ? &chlg_desc : NULL,
+                                                     0, nego->context,
+                                                     &resp_desc, &attrs,
+                                                     &expiry);
+
+  if(GSS_ERROR(nego->status)) {
+    free(chlg);
+    return CURLE_OUT_OF_MEMORY;
+  }
+
+  if(nego->status == SEC_I_COMPLETE_NEEDED ||
+     nego->status == SEC_I_COMPLETE_AND_CONTINUE) {
+    nego->status = s_pSecFn->CompleteAuthToken(nego->context, &resp_desc);
+    if(GSS_ERROR(nego->status)) {
+      free(chlg);
+      return CURLE_RECV_ERROR;
+    }
+  }
+
+  nego->output_token_length = resp_buf.cbBuffer;
+
+  /* Free the decoded challenge */
+  free(chlg);
+
+  return result;
+}
+
+/*
+ * Curl_auth_create_spnego_message()
+ *
+ * This is used to generate an already encoded SPNEGO (Negotiate) response
+ * message ready for sending to the recipient.
+ *
+ * Parameters:
+ *
+ * data        [in]     - The session handle.
+ * nego        [in/out] - The Negotiate data struct being used and modified.
+ * outptr      [in/out] - The address where a pointer to newly allocated memory
+ *                        holding the result will be stored upon completion.
+ * outlen      [out]    - The length of the output message.
+ *
+ * Returns CURLE_OK on success.
+ */
+CURLcode Curl_auth_create_spnego_message(struct SessionHandle *data,
+                                         struct negotiatedata *nego,
+                                         char **outptr, size_t *outlen)
+{
+  CURLcode result;
+
+  /* Base64 encode the already generated response */
+  result = Curl_base64_encode(data,
+                              (const char*) nego->output_token,
+                              nego->output_token_length,
+                              outptr, outlen);
+
+  if(result)
+    return result;
+
+  if(!*outptr || !*outlen)
+    return CURLE_REMOTE_ACCESS_DENIED;
+
+  return CURLE_OK;
+}
+
+/*
+ * Curl_auth_spnego_cleanup()
+ *
+ * This is used to clean up the SPNEGO (Negotiate) specific data.
+ *
+ * Parameters:
+ *
+ * nego     [in/out] - The Negotiate data struct being cleaned up.
+ *
+ */
+void Curl_auth_spnego_cleanup(struct negotiatedata* nego)
+{
+  /* Free our security context */
+  if(nego->context) {
+    s_pSecFn->DeleteSecurityContext(nego->context);
+    free(nego->context);
+    nego->context = NULL;
+  }
+
+  /* Free our credentials handle */
+  if(nego->credentials) {
+    s_pSecFn->FreeCredentialsHandle(nego->credentials);
+    free(nego->credentials);
+    nego->credentials = NULL;
+  }
+
+  /* Free our identity */
+  Curl_sspi_free_identity(nego->p_identity);
+  nego->p_identity = NULL;
+
+  /* Free the SPN and output token */
+  Curl_safefree(nego->server_name);
+  Curl_safefree(nego->output_token);
+
+  /* Reset any variables */
+  nego->token_max = 0;
+}
+
+#endif /* USE_WINDOWS_SSPI && USE_SPNEGO */
diff --git a/lib/vauth/vauth.h b/lib/vauth/vauth.h
index 7f2f48826..8a0c67765 100644
--- a/lib/vauth/vauth.h
+++ b/lib/vauth/vauth.h
@@ -38,6 +38,14 @@ struct ntlmdata;
 struct kerberos5data;
 #endif
 
+#if defined(USE_WINDOWS_SSPI) && defined(USE_SPNEGO)
+struct negotiatedata;
+#endif
+
+#if defined(USE_WINDOWS_SSPI)
+#define GSS_ERROR(status) (status & 0x80000000)
+#endif
+
 /* This is used to build a SPN string */
 #if !defined(USE_WINDOWS_SSPI)
 char *Curl_auth_build_spn(const char *service, const char *instance);
@@ -157,4 +165,26 @@ CURLcode Curl_auth_create_gssapi_security_message(struct SessionHandle *data,
 void Curl_auth_gssapi_cleanup(struct kerberos5data *krb5);
 #endif /* USE_KERBEROS5 */
 
+#if defined(USE_WINDOWS_SSPI) && defined(USE_SPNEGO)
+/* This is used to decode a base64 encoded SPNEGO (Negotiate) challenge
+   message */
+CURLcode Curl_auth_decode_spnego_message(struct SessionHandle *data,
+                                         const char *user,
+                                         const char *passwood,
+                                         const char *service,
+                                         const char *host,
+                                         const char *chlg64,
+                                         struct negotiatedata *nego);
+
+/* This is used to generate a base64 encoded SPNEGO (Negotiate) response
+   message */
+CURLcode Curl_auth_create_spnego_message(struct SessionHandle *data,
+                                         struct negotiatedata *nego,
+                                         char **outptr, size_t *outlen);
+
+/* This is used to clean up the SPNEGO specifiec data */
+void Curl_auth_spnego_cleanup(struct negotiatedata* nego);
+
+#endif /* USE_WINDOWS_SSPI && USE_SPNEGO */
+
 #endif /* HEADER_CURL_VAUTH_H */