HTTP: HTTP Negotiate authentication using SSPI

Only under Windows

lib/Makefile.inc

@@ -21,7 +21,7 @@ CSOURCES = file.c timeval.c base64.c hostip.c progress.c formdata.c	\
   socks_gssapi.c socks_sspi.c curl_sspi.c slist.c nonblock.c		\
   curl_memrchr.c imap.c pop3.c smtp.c pingpong.c rtsp.c curl_threads.c	\
   warnless.c hmac.c polarssl.c curl_rtmp.c openldap.c curl_gethostname.c\
-  gopher.c axtls.c idn_win32.c
+  gopher.c axtls.c idn_win32.c http_negotiate_sspi.c
 
 HHEADERS = arpa_telnet.h netrc.h file.h timeval.h qssl.h hostip.h	\
   progress.h formdata.h cookie.h http.h sendf.h ftp.h url.h dict.h	\

lib/http.c

@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2011, 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
@@ -520,7 +520,7 @@ output_auth_headers(struct connectdata *conn,
   struct SessionHandle *data = conn->data;
   const char *auth=NULL;
   CURLcode result = CURLE_OK;
-#ifdef HAVE_GSSAPI
+#ifdef USE_HTTP_NEGOTIATE
   struct negotiatedata *negdata = proxy?
     &data->state.proxyneg:&data->state.negotiate;
 #endif
@@ -530,7 +530,7 @@ output_auth_headers(struct connectdata *conn,
   (void)path;
 #endif
 
-#ifdef HAVE_GSSAPI
+#ifdef USE_HTTP_NEGOTIATE
   if((authstatus->picked == CURLAUTH_GSSNEGOTIATE) &&
      negdata->context && !GSS_ERROR(negdata->status)) {
     auth="GSS-Negotiate";
@@ -727,7 +727,7 @@ CURLcode Curl_http_input_auth(struct connectdata *conn,
    *
    */
 
-#ifdef HAVE_GSSAPI
+#ifdef USE_HTTP_NEGOTIATE
   if(checkprefix("GSS-Negotiate", start) ||
       checkprefix("Negotiate", start)) {
     int neg;

lib/http_negotiate.h

@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2011, 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
@@ -22,7 +22,7 @@
  *
  ***************************************************************************/
 
-#ifdef HAVE_GSSAPI
+#ifdef USE_HTTP_NEGOTIATE
 
 /* this is for Negotiate header input */
 int Curl_input_negotiate(struct connectdata *conn, bool proxy,
@@ -33,6 +33,10 @@ CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy);
 
 void Curl_cleanup_negotiate(struct SessionHandle *data);
 
-#endif /* HAVE_GSSAPI */
+#ifdef USE_WINDOWS_SSPI
+#define GSS_ERROR(status) (status & 0x80000000)
+#endif
+
+#endif /* USE_HTTP_NEGOTIATE */
 
 #endif /* HEADER_CURL_HTTP_NEGOTIATE_H */

lib/http_negotiate_sspi.c

@@ -0,0 +1,292 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2011, 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.
+ *
+ ***************************************************************************/
+#include "setup.h"
+
+#ifdef USE_WINDOWS_SSPI
+
+#ifndef CURL_DISABLE_HTTP
+/* -- WIN32 approved -- */
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+#include "urldata.h"
+#include "sendf.h"
+#include "rawstr.h"
+#include "curl_base64.h"
+#include "http_negotiate.h"
+#include "curl_memory.h"
+
+#define _MPRINTF_REPLACE /* use our functions only */
+#include <curl/mprintf.h>
+
+/* The last #include file should be: */
+#include "memdebug.h"
+
+static int
+get_gss_name(struct connectdata *conn, bool proxy, char *server)
+{
+  struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
+    &conn->data->state.negotiate;
+  const char* service;
+  size_t length;
+
+  /* GSSAPI implementation by Globus (known as GSI) requires the name to be
+     of form "<service>/<fqdn>" instead of <service>@<fqdn> (ie. slash instead
+     of at-sign). Also GSI servers are often identified as 'host' not 'khttp'.
+     Change following lines if you want to use GSI */
+
+  /* IIS uses the <service>@<fqdn> form but uses 'http' as the service name,
+     and SSPI then generates an NTLM token. When using <service>/<fqdn> a
+     Kerberos token is generated. */
+
+  if(neg_ctx->gss)
+    service = "KHTTP";
+  else
+    service = "HTTP";
+
+  length = strlen(service) + 1 + strlen(proxy ? conn->proxy.name :
+                                        conn->host.name) + 1;
+  if(length + 1 > sizeof(neg_ctx->server_name))
+    return EMSGSIZE;
+
+  snprintf(server, sizeof(neg_ctx->server_name), "%s/%s",
+           service, proxy ? conn->proxy.name : conn->host.name);
+
+  return 0;
+}
+
+/* returning zero (0) means success, everything else is treated as "failure"
+   with no care exactly what the failure was */
+int Curl_input_negotiate(struct connectdata *conn, bool proxy,
+                         const char *header)
+{
+  struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
+    &conn->data->state.negotiate;
+  BYTE                          *input_token = 0;
+  SecBufferDesc     out_buff_desc;
+  SecBuffer         out_sec_buff;
+  SecBufferDesc     in_buff_desc;
+  SecBuffer         in_sec_buff;
+  ULONG             context_attributes;
+  TimeStamp         lifetime;
+
+  int ret;
+  size_t len = 0, input_token_len = 0;
+  bool gss = FALSE;
+  const char* protocol;
+
+  while(*header && ISSPACE(*header))
+    header++;
+
+  if(checkprefix("GSS-Negotiate", header)) {
+    protocol = "GSS-Negotiate";
+    gss = TRUE;
+  }
+  else if(checkprefix("Negotiate", header)) {
+    protocol = "Negotiate";
+    gss = FALSE;
+  }
+  else
+    return -1;
+
+  if(neg_ctx->context) {
+    if(neg_ctx->gss != gss) {
+      return -1;
+    }
+  }
+  else {
+    neg_ctx->protocol = protocol;
+    neg_ctx->gss = gss;
+  }
+
+  if(neg_ctx->context && neg_ctx->status == SEC_E_OK) {
+    /* We finished succesfully 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(conn->data);
+    return -1;
+  }
+
+  if(strlen(neg_ctx->server_name) == 0 &&
+     (ret = get_gss_name(conn, proxy, neg_ctx->server_name)))
+    return ret;
+
+  if (!neg_ctx->max_token_length) {
+    PSecPkgInfo SecurityPackage;
+    ret = s_pSecFn->QuerySecurityPackageInfo("Negotiate", &SecurityPackage);
+    if (ret != SEC_E_OK)
+      return -1;
+
+    /* Allocate input and output buffers according to the max token size
+       as indicated by the security package */
+    neg_ctx->max_token_length = SecurityPackage->cbMaxToken;
+    neg_ctx->output_token = (BYTE *)malloc(neg_ctx->max_token_length);
+    s_pSecFn->FreeContextBuffer(SecurityPackage);
+  }
+
+  /* Obtain the input token, if any */
+  header += strlen(neg_ctx->protocol);
+  while(*header && ISSPACE(*header))
+    header++;
+
+  len = strlen(header);
+  if(len > 0) {
+    input_token = malloc(neg_ctx->max_token_length);
+    if(!input_token)
+      return -1;
+
+    input_token_len = Curl_base64_decode(header,
+                                         (unsigned char **)&input_token);
+    if(input_token_len == 0)
+      return -1;
+  }
+
+  if ( !input_token ) {
+    /* first call in a new negotation, we have to require credentials,
+       and allocate memory for the context */
+
+    neg_ctx->credentials = (CredHandle *)malloc(sizeof(CredHandle));
+    neg_ctx->context = (CtxtHandle *)malloc(sizeof(CtxtHandle));
+
+    if ( !neg_ctx->credentials || !neg_ctx->context)
+      return -1;
+
+    neg_ctx->status =
+      s_pSecFn->AcquireCredentialsHandle(NULL, "Negotiate",
+                                         SECPKG_CRED_OUTBOUND, NULL, NULL,
+                                         NULL, NULL, neg_ctx->credentials,
+                                         &lifetime);
+    if ( neg_ctx->status != SEC_E_OK )
+      return -1;
+  }
+
+  /* prepare the output buffers, and input buffers if present */
+  out_buff_desc.ulVersion = 0;
+  out_buff_desc.cBuffers  = 1;
+  out_buff_desc.pBuffers  = &out_sec_buff;
+
+  out_sec_buff.cbBuffer   = neg_ctx->max_token_length;
+  out_sec_buff.BufferType = SECBUFFER_TOKEN;
+  out_sec_buff.pvBuffer   = neg_ctx->output_token;
+
+
+  if (input_token) {
+    in_buff_desc.ulVersion = 0;
+    in_buff_desc.cBuffers  = 1;
+    in_buff_desc.pBuffers  = &out_sec_buff;
+
+    in_sec_buff.cbBuffer   = input_token_len;
+    in_sec_buff.BufferType = SECBUFFER_TOKEN;
+    in_sec_buff.pvBuffer   = input_token;
+  }
+
+  neg_ctx->status = s_pSecFn->InitializeSecurityContext(
+    neg_ctx->credentials,
+    input_token ? neg_ctx->context : 0,
+    neg_ctx->server_name,
+    ISC_REQ_CONFIDENTIALITY,
+    0,
+    SECURITY_NATIVE_DREP,
+    input_token ? &in_buff_desc : 0,
+    0,
+    neg_ctx->context,
+    &out_buff_desc,
+    &context_attributes,
+    &lifetime);
+
+  if ( GSS_ERROR(neg_ctx->status) )
+    return -1;
+
+  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 -1;
+  }
+
+  neg_ctx->output_token_length = out_sec_buff.cbBuffer;
+
+  return 0;
+}
+
+
+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;
+  size_t len;
+  char *userp;
+
+  len = Curl_base64_encode(conn->data,
+                           neg_ctx->output_token,
+                           neg_ctx->output_token_length,
+                           &encoded);
+
+  if(len == 0)
+    return CURLE_OUT_OF_MEMORY;
+
+  userp = aprintf("%sAuthorization: %s %s\r\n", proxy ? "Proxy-" : "",
+                  neg_ctx->protocol, encoded);
+
+  if(proxy)
+    conn->allocptr.proxyuserpwd = userp;
+  else
+    conn->allocptr.userpwd = userp;
+  free(encoded);
+  Curl_cleanup_negotiate (conn->data);
+  return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
+}
+
+static void cleanup(struct negotiatedata *neg_ctx)
+{
+  if(neg_ctx->context) {
+    s_pSecFn->DeleteSecurityContext(neg_ctx->context);
+    free(neg_ctx->context);
+    neg_ctx->context = 0;
+  }
+
+  if(neg_ctx->credentials) {
+    s_pSecFn->FreeCredentialsHandle(neg_ctx->credentials);
+    free(neg_ctx->credentials);
+    neg_ctx->credentials = 0;
+  }
+
+  if(neg_ctx->output_token) {
+    free(neg_ctx->output_token);
+    neg_ctx->output_token = 0;
+  }
+}
+
+void Curl_cleanup_negotiate(struct SessionHandle *data)
+{
+  cleanup(&data->state.negotiate);
+  cleanup(&data->state.proxyneg);
+}
+
+
+#endif
+#endif

lib/setup.h

@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2011, 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
@@ -541,6 +541,10 @@ int netware_init(void);
 #define USE_SSL    /* SSL support has been enabled */
 #endif
 
+#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
+#define USE_HTTP_NEGOTIATE
+#endif
+
 #if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_NTLM)
 #if defined(USE_SSLEAY) || defined(USE_WINDOWS_SSPI) || defined(USE_GNUTLS) || defined(USE_NSS)
 #define USE_NTLM

lib/url.c

@@ -1454,8 +1454,8 @@ CURLcode Curl_setopt(struct SessionHandle *data, CURLoption option,
 #ifndef USE_NTLM
     auth &= ~CURLAUTH_NTLM; /* no NTLM without SSL */
 #endif
-#ifndef HAVE_GSSAPI
+#ifndef USE_HTTP_NEGOTIATE
-    auth &= ~CURLAUTH_GSSNEGOTIATE; /* no GSS-Negotiate without GSSAPI */
+    auth &= ~CURLAUTH_GSSNEGOTIATE; /* no GSS-Negotiate without GSSAPI or WINDOWS_SSPI */
 #endif
     if(!auth)
       return CURLE_FAILED_INIT; /* no supported types left! */
@@ -1514,8 +1514,8 @@ CURLcode Curl_setopt(struct SessionHandle *data, CURLoption option,
 #ifndef USE_NTLM
     auth &= ~CURLAUTH_NTLM; /* no NTLM without SSL */
 #endif
-#ifndef HAVE_GSSAPI
+#ifndef USE_HTTP_NEGOTIATE
-    auth &= ~CURLAUTH_GSSNEGOTIATE; /* no GSS-Negotiate without GSSAPI */
+    auth &= ~CURLAUTH_GSSNEGOTIATE; /* no GSS-Negotiate without GSSAPI or WINDOWS_SSPI */
 #endif
     if(!auth)
       return CURLE_FAILED_INIT; /* no supported types left! */

lib/urldata.h

@@ -7,7 +7,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2011, 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
@@ -358,17 +358,29 @@ struct ntlmdata {
 #endif
 };
 
-#ifdef HAVE_GSSAPI
+#ifdef USE_HTTP_NEGOTIATE
 struct negotiatedata {
   /* when doing Negotiate we first need to receive an auth token and then we
      need to send our header */
   enum { GSS_AUTHNONE, GSS_AUTHRECV, GSS_AUTHSENT } state;
   bool gss; /* Whether we're processing GSS-Negotiate or Negotiate */
   const char* protocol; /* "GSS-Negotiate" or "Negotiate" */
+#ifdef HAVE_GSSAPI
   OM_uint32 status;
   gss_ctx_id_t context;
   gss_name_t server_name;
   gss_buffer_desc output_token;
+#else
+#ifdef USE_WINDOWS_SSPI
+  DWORD status;
+  CtxtHandle *context;
+  CredHandle *credentials;
+  char server_name[1024];
+  size_t max_token_length;
+  BYTE *output_token;
+  size_t output_token_length;
+#endif
+#endif
 };
 #endif
 
@@ -1127,7 +1139,7 @@ struct UrlState {
   struct digestdata digest;      /* state data for host Digest auth */
   struct digestdata proxydigest; /* state data for proxy Digest auth */
 
-#ifdef HAVE_GSSAPI
+#ifdef USE_HTTP_NEGOTIATE
   struct negotiatedata negotiate; /* state data for host Negotiate auth */
   struct negotiatedata proxyneg; /* state data for proxy Negotiate auth */
 #endif

lib/version.c

@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2011, 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
@@ -243,7 +243,7 @@ static curl_version_info_data version_info = {
 #ifdef HAVE_LIBZ
   | CURL_VERSION_LIBZ
 #endif
-#ifdef HAVE_GSSAPI
+#ifdef USE_HTTP_NEGOTIATE
   | CURL_VERSION_GSSNEGOTIATE
 #endif
 #ifdef DEBUGBUILD