lib/http_negotiate.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 1998 - 2011, 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 "setup.h"
  24
  25 #ifdef HAVE_GSSAPI
  26 #ifdef HAVE_OLD_GSSMIT
  27 #define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
  28 #endif
  29
  30 #ifndef CURL_DISABLE_HTTP
  31
  32 #include "urldata.h"
  33 #include "sendf.h"
  34 #include "curl_gssapi.h"
  35 #include "rawstr.h"
  36 #include "curl_base64.h"
  37 #include "http_negotiate.h"
  38 #include "curl_memory.h"
  39
  40 #ifdef HAVE_SPNEGO
  41 #  include <spnegohelp.h>
  42 #  ifdef USE_SSLEAY
  43 #    ifdef USE_OPENSSL
  44 #      include <openssl/objects.h>
  45 #    else
  46 #      include <objects.h>
  47 #    endif
  48 #  else
  49 #    error "Can't compile SPNEGO support without OpenSSL."
  50 #  endif
  51 #endif
  52
  53 #define _MPRINTF_REPLACE /* use our functions only */
  54 #include <curl/mprintf.h>
  55
  56 /* The last #include file should be: */
  57 #include "memdebug.h"
  58
  59 static int
  60 get_gss_name(struct connectdata *conn, bool proxy, gss_name_t *server)
  61 {
  62   struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
  63     &conn->data->state.negotiate;
  64   OM_uint32 major_status, minor_status;
  65   gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
  66   char name[2048];
  67   const char* service;
  68
  69   /* GSSAPI implementation by Globus (known as GSI) requires the name to be
  70      of form "<service>/<fqdn>" instead of <service>@<fqdn> (ie. slash instead
  71      of at-sign). Also GSI servers are often identified as 'host' not 'khttp'.
  72      Change following lines if you want to use GSI */
  73
  74   /* IIS uses the <service>@<fqdn> form but uses 'http' as the service name */
  75
  76   if(neg_ctx->gss)
  77     service = "KHTTP";
  78   else
  79     service = "HTTP";
  80
  81   token.length = strlen(service) + 1 + strlen(proxy ? conn->proxy.name :
  82                                               conn->host.name) + 1;
  83   if(token.length + 1 > sizeof(name))
  84     return EMSGSIZE;
  85
  86   snprintf(name, sizeof(name), "%s@%s", service, proxy ? conn->proxy.name :
  87            conn->host.name);
  88
  89   token.value = (void *) name;
  90   major_status = gss_import_name(&minor_status,
  91                                  &token,
  92                                  GSS_C_NT_HOSTBASED_SERVICE,
  93                                  server);
  94
  95   return GSS_ERROR(major_status) ? -1 : 0;
  96 }
  97
  98 static void
  99 log_gss_error(struct connectdata *conn, OM_uint32 error_status,
 100               const char *prefix)
 101 {
 102   OM_uint32 maj_stat, min_stat;
 103   OM_uint32 msg_ctx = 0;
 104   gss_buffer_desc status_string;
 105   char buf[1024];
 106   size_t len;
 107
 108   snprintf(buf, sizeof(buf), "%s", prefix);
 109   len = strlen(buf);
 110   do {
 111     maj_stat = gss_display_status(&min_stat,
 112                                   error_status,
 113                                   GSS_C_MECH_CODE,
 114                                   GSS_C_NO_OID,
 115                                   &msg_ctx,
 116                                   &status_string);
 117       if(sizeof(buf) > len + status_string.length + 1) {
 118         snprintf(buf + len, sizeof(buf) - len,
 119                  ": %s", (char*) status_string.value);
 120       len += status_string.length;
 121     }
 122     gss_release_buffer(&min_stat, &status_string);
 123   } while(!GSS_ERROR(maj_stat) && msg_ctx != 0);
 124
 125   infof(conn->data, "%s", buf);
 126 }
 127
 128 /* returning zero (0) means success, everything else is treated as "failure"
 129    with no care exactly what the failure was */
 130 int Curl_input_negotiate(struct connectdata *conn, bool proxy,
 131                          const char *header)
 132 {
 133   struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
 134     &conn->data->state.negotiate;
 135   OM_uint32 major_status, minor_status, minor_status2;
 136   gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
 137   gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
 138   int ret;
 139   size_t len, rawlen;
 140   bool gss;
 141   const char* protocol;
 142
 143   while(*header && ISSPACE(*header))
 144     header++;
 145   if(checkprefix("GSS-Negotiate", header)) {
 146     protocol = "GSS-Negotiate";
 147     gss = TRUE;
 148   }
 149   else if(checkprefix("Negotiate", header)) {
 150     protocol = "Negotiate";
 151     gss = FALSE;
 152   }
 153   else
 154     return -1;
 155
 156   if(neg_ctx->context) {
 157     if(neg_ctx->gss != gss) {
 158       return -1;
 159     }
 160   }
 161   else {
 162     neg_ctx->protocol = protocol;
 163     neg_ctx->gss = gss;
 164   }
 165
 166   if(neg_ctx->context && neg_ctx->status == GSS_S_COMPLETE) {
 167     /* We finished successfully our part of authentication, but server
 168      * rejected it (since we're again here). Exit with an error since we
 169      * can't invent anything better */
 170     Curl_cleanup_negotiate(conn->data);
 171     return -1;
 172   }
 173
 174   if(neg_ctx->server_name == NULL &&
 175       (ret = get_gss_name(conn, proxy, &neg_ctx->server_name)))
 176     return ret;
 177
 178   header += strlen(neg_ctx->protocol);
 179   while(*header && ISSPACE(*header))
 180     header++;
 181
 182   len = strlen(header);
 183   if(len > 0) {
 184     rawlen = Curl_base64_decode(header,
 185                                 (unsigned char **)&input_token.value);
 186     if(rawlen == 0)
 187       return -1;
 188     input_token.length = rawlen;
 189
 190 #ifdef HAVE_SPNEGO /* Handle SPNEGO */
 191     if(checkprefix("Negotiate", header)) {
 192       ASN1_OBJECT *   object            = NULL;
 193       int             rc                = 1;
 194       unsigned char * spnegoToken       = NULL;
 195       size_t          spnegoTokenLength = 0;
 196       unsigned char * mechToken         = NULL;
 197       size_t          mechTokenLength   = 0;
 198
 199       if(input_token.value == NULL)
 200         return CURLE_OUT_OF_MEMORY;
 201
 202       spnegoToken = malloc(input_token.length);
 203       if(spnegoToken == NULL)
 204         return CURLE_OUT_OF_MEMORY;
 205
 206       spnegoTokenLength = input_token.length;
 207
 208       object = OBJ_txt2obj ("1.2.840.113554.1.2.2", 1);
 209       if(!parseSpnegoTargetToken(spnegoToken,
 210                                  spnegoTokenLength,
 211                                  NULL,
 212                                  NULL,
 213                                  &mechToken,
 214                                  &mechTokenLength,
 215                                  NULL,
 216                                  NULL)) {
 217         free(spnegoToken);
 218         spnegoToken = NULL;
 219         infof(conn->data, "Parse SPNEGO Target Token failed\n");
 220       }
 221       else {
 222         free(input_token.value);
 223         input_token.value = malloc(mechTokenLength);
 224         if(input_token.value == NULL)
 225           return CURLE_OUT_OF_MEMORY;
 226
 227         memcpy(input_token.value, mechToken,mechTokenLength);
 228         input_token.length = mechTokenLength;
 229         free(mechToken);
 230         mechToken = NULL;
 231         infof(conn->data, "Parse SPNEGO Target Token succeeded\n");
 232       }
 233     }
 234 #endif
 235   }
 236
 237   major_status = Curl_gss_init_sec_context(&minor_status,
 238                                            &neg_ctx->context,
 239                                            neg_ctx->server_name,
 240                                            GSS_C_NO_CHANNEL_BINDINGS,
 241                                            &input_token,
 242                                            &output_token,
 243                                            NULL);
 244   if(input_token.length > 0)
 245     gss_release_buffer(&minor_status2, &input_token);
 246   neg_ctx->status = major_status;
 247   if(GSS_ERROR(major_status)) {
 248     /* Curl_cleanup_negotiate(conn->data) ??? */
 249     log_gss_error(conn, minor_status,
 250                   "gss_init_sec_context() failed: ");
 251     return -1;
 252   }
 253
 254   if(output_token.length == 0) {
 255     return -1;
 256   }
 257
 258   neg_ctx->output_token = output_token;
 259   /* conn->bits.close = FALSE; */
 260
 261   return 0;
 262 }
 263
 264
 265 CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy)
 266 {
 267   struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
 268     &conn->data->state.negotiate;
 269   char *encoded = NULL;
 270   size_t len;
 271   char *userp;
 272
 273 #ifdef HAVE_SPNEGO /* Handle SPNEGO */
 274   if(checkprefix("Negotiate", neg_ctx->protocol)) {
 275     ASN1_OBJECT *   object            = NULL;
 276     int             rc                = 1;
 277     unsigned char * spnegoToken       = NULL;
 278     size_t          spnegoTokenLength = 0;
 279     unsigned char * responseToken       = NULL;
 280     size_t          responseTokenLength = 0;
 281
 282     responseToken = malloc(neg_ctx->output_token.length);
 283     if(responseToken == NULL)
 284       return CURLE_OUT_OF_MEMORY;
 285     memcpy(responseToken, neg_ctx->output_token.value,
 286            neg_ctx->output_token.length);
 287     responseTokenLength = neg_ctx->output_token.length;
 288
 289     object=OBJ_txt2obj ("1.2.840.113554.1.2.2", 1);
 290     if(!makeSpnegoInitialToken (object,
 291                                  responseToken,
 292                                  responseTokenLength,
 293                                  &spnegoToken,
 294                                  &spnegoTokenLength)) {
 295       free(responseToken);
 296       responseToken = NULL;
 297       infof(conn->data, "Make SPNEGO Initial Token failed\n");
 298     }
 299     else {
 300       free(responseToken);
 301       responseToken = NULL;
 302       free(neg_ctx->output_token.value);
 303       neg_ctx->output_token.value = malloc(spnegoTokenLength);
 304       if(neg_ctx->output_token.value == NULL) {
 305         free(spnegoToken);
 306         spnegoToken = NULL;
 307         return CURLE_OUT_OF_MEMORY;
 308       }
 309       memcpy(neg_ctx->output_token.value, spnegoToken,spnegoTokenLength);
 310       neg_ctx->output_token.length = spnegoTokenLength;
 311       free(spnegoToken);
 312       spnegoToken = NULL;
 313       infof(conn->data, "Make SPNEGO Initial Token succeeded\n");
 314     }
 315   }
 316 #endif
 317   len = Curl_base64_encode(conn->data,
 318                            neg_ctx->output_token.value,
 319                            neg_ctx->output_token.length,
 320                            &encoded);
 321
 322   if(len == 0)
 323     return CURLE_OUT_OF_MEMORY;
 324
 325   userp = aprintf("%sAuthorization: %s %s\r\n", proxy ? "Proxy-" : "",
 326                   neg_ctx->protocol, encoded);
 327
 328   if(proxy)
 329     conn->allocptr.proxyuserpwd = userp;
 330   else
 331     conn->allocptr.userpwd = userp;
 332   free(encoded);
 333   Curl_cleanup_negotiate (conn->data);
 334   return (userp == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
 335 }
 336
 337 static void cleanup(struct negotiatedata *neg_ctx)
 338 {
 339   OM_uint32 minor_status;
 340   if(neg_ctx->context != GSS_C_NO_CONTEXT)
 341     gss_delete_sec_context(&minor_status, &neg_ctx->context, GSS_C_NO_BUFFER);
 342
 343   if(neg_ctx->output_token.length != 0)
 344     gss_release_buffer(&minor_status, &neg_ctx->output_token);
 345
 346   if(neg_ctx->server_name != GSS_C_NO_NAME)
 347     gss_release_name(&minor_status, &neg_ctx->server_name);
 348
 349   memset(neg_ctx, 0, sizeof(*neg_ctx));
 350 }
 351
 352 void Curl_cleanup_negotiate(struct SessionHandle *data)
 353 {
 354   cleanup(&data->state.negotiate);
 355   cleanup(&data->state.proxyneg);
 356 }
 357
 358
 359 #endif
 360 #endif