lib/http_negotiate.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
   9  *
  10  * This software is licensed as described in the file COPYING, which
  11  * you should have received as part of this distribution. The terms
  12  * are also available at http://curl.haxx.se/docs/copyright.html.
  13  *
  14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  15  * copies of the Software, and permit persons to whom the Software is
  16  * furnished to do so, under the terms of the COPYING file.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ***************************************************************************/
  22
  23 #include "curl_setup.h"
  24
  25 #ifdef HAVE_GSSAPI
  26 #ifdef HAVE_OLD_GSSMIT
  27 #define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
  28 #define NCOMPAT 1
  29 #endif
  30
  31 #ifndef CURL_DISABLE_HTTP
  32
  33 #include "urldata.h"
  34 #include "sendf.h"
  35 #include "curl_gssapi.h"
  36 #include "rawstr.h"
  37 #include "curl_base64.h"
  38 #include "http_negotiate.h"
  39 #include "curl_memory.h"
  40 #include "url.h"
  41
  42 #ifdef HAVE_SPNEGO
  43 #  include <spnegohelp.h>
  44 #  ifdef USE_SSLEAY
  45 #    ifdef USE_OPENSSL
  46 #      include <openssl/objects.h>
  47 #    else
  48 #      include <objects.h>
  49 #    endif
  50 #  else
  51 #    error "Can't compile SPNEGO support without OpenSSL."
  52 #  endif
  53 #endif
  54
  55 #define _MPRINTF_REPLACE /* use our functions only */
  56 #include <curl/mprintf.h>
  57
  58 /* The last #include file should be: */
  59 #include "memdebug.h"
  60
  61 static int
  62 get_gss_name(struct connectdata *conn, bool proxy, gss_name_t *server)
  63 {
  64   struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
  65     &conn->data->state.negotiate;
  66   OM_uint32 major_status, minor_status;
  67   gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
  68   char name[2048];
  69   const char* service;
  70
  71   /* GSSAPI implementation by Globus (known as GSI) requires the name to be
  72      of form "<service>/<fqdn>" instead of <service>@<fqdn> (ie. slash instead
  73      of at-sign). Also GSI servers are often identified as 'host' not 'khttp'.
  74      Change following lines if you want to use GSI */
  75
  76   /* IIS uses the <service>@<fqdn> form but uses 'http' as the service name */
  77
  78   if(neg_ctx->gss)
  79     service = "KHTTP";
  80   else
  81     service = "HTTP";
  82
  83   token.length = strlen(service) + 1 + strlen(proxy ? conn->proxy.name :
  84                                               conn->host.name) + 1;
  85   if(token.length + 1 > sizeof(name))
  86     return EMSGSIZE;
  87
  88   snprintf(name, sizeof(name), "%s@%s", service, proxy ? conn->proxy.name :
  89            conn->host.name);
  90
  91   token.value = (void *) name;
  92   major_status = gss_import_name(&minor_status,
  93                                  &token,
  94                                  GSS_C_NT_HOSTBASED_SERVICE,
  95                                  server);
  96
  97   return GSS_ERROR(major_status) ? -1 : 0;
  98 }
  99
 100 static void
 101 log_gss_error(struct connectdata *conn, OM_uint32 error_status,
 102               const char *prefix)
 103 {
 104   OM_uint32 maj_stat, min_stat;
 105   OM_uint32 msg_ctx = 0;
 106   gss_buffer_desc status_string;
 107   char buf[1024];
 108   size_t len;
 109
 110   snprintf(buf, sizeof(buf), "%s", prefix);
 111   len = strlen(buf);
 112   do {
 113     maj_stat = gss_display_status(&min_stat,
 114                                   error_status,
 115                                   GSS_C_MECH_CODE,
 116                                   GSS_C_NO_OID,
 117                                   &msg_ctx,
 118                                   &status_string);
 119       if(sizeof(buf) > len + status_string.length + 1) {
 120         snprintf(buf + len, sizeof(buf) - len,
 121                  ": %s", (char*) status_string.value);
 122       len += status_string.length;
 123     }
 124     gss_release_buffer(&min_stat, &status_string);
 125   } while(!GSS_ERROR(maj_stat) && msg_ctx != 0);
 126
 127   infof(conn->data, "%s\n", buf);
 128 }
 129
 130 /* returning zero (0) means success, everything else is treated as "failure"
 131    with no care exactly what the failure was */
 132 int Curl_input_negotiate(struct connectdata *conn, bool proxy,
 133                          const char *header)
 134 {
 135   struct SessionHandle *data = conn->data;
 136   struct negotiatedata *neg_ctx = proxy?&data->state.proxyneg:
 137     &data->state.negotiate;
 138   OM_uint32 major_status, minor_status, minor_status2;
 139   gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
 140   gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
 141   int ret;
 142   size_t len;
 143   size_t rawlen = 0;
 144   bool gss;
 145   const char* protocol;
 146   CURLcode error;
 147
 148   while(*header && ISSPACE(*header))
 149     header++;
 150   if(checkprefix("GSS-Negotiate", header)) {
 151     protocol = "GSS-Negotiate";
 152     gss = TRUE;
 153   }
 154   else if(checkprefix("Negotiate", header)) {
 155     protocol = "Negotiate";
 156     gss = FALSE;
 157   }
 158   else
 159     return -1;
 160
 161   if(neg_ctx->context) {
 162     if(neg_ctx->gss != gss) {
 163       return -1;
 164     }
 165   }
 166   else {
 167     neg_ctx->protocol = protocol;
 168     neg_ctx->gss = gss;
 169   }
 170
 171   if(neg_ctx->context && neg_ctx->status == GSS_S_COMPLETE) {
 172     /* We finished successfully our part of authentication, but server
 173      * rejected it (since we're again here). Exit with an error since we
 174      * can't invent anything better */
 175     Curl_cleanup_negotiate(data);
 176     return -1;
 177   }
 178
 179   if(neg_ctx->server_name == NULL &&
 180       (ret = get_gss_name(conn, proxy, &neg_ctx->server_name)))
 181     return ret;
 182
 183   header += strlen(neg_ctx->protocol);
 184   while(*header && ISSPACE(*header))
 185     header++;
 186
 187   len = strlen(header);
 188   if(len > 0) {
 189     error = Curl_base64_decode(header,
 190                                (unsigned char **)&input_token.value, &rawlen);
 191     if(error || rawlen == 0)
 192       return -1;
 193     input_token.length = rawlen;
 194
 195 #ifdef HAVE_SPNEGO /* Handle SPNEGO */
 196     if(checkprefix("Negotiate", header)) {
 197       ASN1_OBJECT *   object            = NULL;
 198       unsigned char * spnegoToken       = NULL;
 199       size_t          spnegoTokenLength = 0;
 200       unsigned char * mechToken         = NULL;
 201       size_t          mechTokenLength   = 0;
 202
 203       if(input_token.value == NULL)
 204         return CURLE_OUT_OF_MEMORY;
 205
 206       spnegoToken = malloc(input_token.length);
 207       if(spnegoToken == NULL)
 208         return CURLE_OUT_OF_MEMORY;
 209
 210       spnegoTokenLength = input_token.length;
 211
 212       object = OBJ_txt2obj ("1.2.840.113554.1.2.2", 1);
 213       if(!parseSpnegoTargetToken(spnegoToken,
 214                                  spnegoTokenLength,
 215                                  NULL,
 216                                  NULL,
 217                                  &mechToken,
 218                                  &mechTokenLength,
 219                                  NULL,
 220                                  NULL)) {
 221         free(spnegoToken);
 222         spnegoToken = NULL;
 223         infof(data, "Parse SPNEGO Target Token failed\n");
 224       }
 225       else {
 226         free(input_token.value);
 227         input_token.value = malloc(mechTokenLength);
 228         if(input_token.value == NULL)
 229           return CURLE_OUT_OF_MEMORY;
 230
 231         memcpy(input_token.value, mechToken,mechTokenLength);
 232         input_token.length = mechTokenLength;
 233         free(mechToken);
 234         mechToken = NULL;
 235         infof(data, "Parse SPNEGO Target Token succeeded\n");
 236       }
 237     }
 238 #endif
 239   }
 240
 241   major_status = Curl_gss_init_sec_context(data,
 242                                            &minor_status,
 243                                            &neg_ctx->context,
 244                                            neg_ctx->server_name,
 245                                            GSS_C_NO_CHANNEL_BINDINGS,
 246                                            &input_token,
 247                                            &output_token,
 248                                            NULL);
 249   if(input_token.length > 0)
 250     gss_release_buffer(&minor_status2, &input_token);
 251   neg_ctx->status = major_status;
 252   if(GSS_ERROR(major_status)) {
 253     /* Curl_cleanup_negotiate(data) ??? */
 254     log_gss_error(conn, minor_status,
 255                   "gss_init_sec_context() failed: ");
 256     return -1;
 257   }
 258
 259   if(output_token.length == 0) {
 260     return -1;
 261   }
 262
 263   neg_ctx->output_token = output_token;
 264   /* conn->bits.close = FALSE; */
 265
 266   return 0;
 267 }
 268
 269
 270 CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy)
 271 {
 272   struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
 273     &conn->data->state.negotiate;
 274   char *encoded = NULL;
 275   size_t len = 0;
 276   char *userp;
 277   CURLcode error;
 278
 279 #ifdef HAVE_SPNEGO /* Handle SPNEGO */
 280   if(checkprefix("Negotiate", neg_ctx->protocol)) {
 281     ASN1_OBJECT *   object            = NULL;
 282     unsigned char * spnegoToken       = NULL;
 283     size_t          spnegoTokenLength = 0;
 284     unsigned char * responseToken       = NULL;
 285     size_t          responseTokenLength = 0;
 286
 287     responseToken = malloc(neg_ctx->output_token.length);
 288     if(responseToken == NULL)
 289       return CURLE_OUT_OF_MEMORY;
 290     memcpy(responseToken, neg_ctx->output_token.value,
 291            neg_ctx->output_token.length);
 292     responseTokenLength = neg_ctx->output_token.length;
 293
 294     object=OBJ_txt2obj ("1.2.840.113554.1.2.2", 1);
 295     if(!makeSpnegoInitialToken (object,
 296                                  responseToken,
 297                                  responseTokenLength,
 298                                  &spnegoToken,
 299                                  &spnegoTokenLength)) {
 300       free(responseToken);
 301       responseToken = NULL;
 302       infof(conn->data, "Make SPNEGO Initial Token failed\n");
 303     }
 304     else {
 305       free(responseToken);
 306       responseToken = NULL;
 307       free(neg_ctx->output_token.value);
 308       neg_ctx->output_token.value = malloc(spnegoTokenLength);
 309       if(neg_ctx->output_token.value == NULL) {
 310         free(spnegoToken);
 311         spnegoToken = NULL;
 312         return CURLE_OUT_OF_MEMORY;
 313       }
 314       memcpy(neg_ctx->output_token.value, spnegoToken,spnegoTokenLength);
 315       neg_ctx->output_token.length = spnegoTokenLength;
 316       free(spnegoToken);
 317       spnegoToken = NULL;
 318       infof(conn->data, "Make SPNEGO Initial Token succeeded\n");
 319     }
 320   }
 321 #endif
 322   error = Curl_base64_encode(conn->data,
 323                              neg_ctx->output_token.value,
 324                              neg_ctx->output_token.length,
 325                              &encoded, &len);
 326   if(error) {
 327     Curl_safefree(neg_ctx->output_token.value);
 328     neg_ctx->output_token.value = NULL;
 329     return error;
 330   }
 331
 332   if(len == 0) {
 333     Curl_safefree(neg_ctx->output_token.value);
 334     neg_ctx->output_token.value = NULL;
 335     return CURLE_REMOTE_ACCESS_DENIED;
 336   }
 337
 338   userp = aprintf("%sAuthorization: %s %s\r\n", proxy ? "Proxy-" : "",
 339                   neg_ctx->protocol, encoded);
 340
 341   if(proxy)
 342     conn->allocptr.proxyuserpwd = userp;
 343   else
 344     conn->allocptr.userpwd = userp;
 345   free(encoded);
 346   Curl_cleanup_negotiate (conn->data);
 347   return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
 348 }
 349
 350 static void cleanup(struct negotiatedata *neg_ctx)
 351 {
 352   OM_uint32 minor_status;
 353   if(neg_ctx->context != GSS_C_NO_CONTEXT)
 354     gss_delete_sec_context(&minor_status, &neg_ctx->context, GSS_C_NO_BUFFER);
 355
 356   if(neg_ctx->output_token.length != 0)
 357     gss_release_buffer(&minor_status, &neg_ctx->output_token);
 358
 359   if(neg_ctx->server_name != GSS_C_NO_NAME)
 360     gss_release_name(&minor_status, &neg_ctx->server_name);
 361
 362   memset(neg_ctx, 0, sizeof(*neg_ctx));
 363 }
 364
 365 void Curl_cleanup_negotiate(struct SessionHandle *data)
 366 {
 367   cleanup(&data->state.negotiate);
 368   cleanup(&data->state.proxyneg);
 369 }
 370
 371
 372 #endif
 373 #endif