lib/http_negotiate.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 1998 - 2008, 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  * $Id$
  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  /* -- WIN32 approved -- */
  32 #include <stdio.h>
  33 #include <string.h>
  34 #include <stdarg.h>
  35 #include <stdlib.h>
  36 #include <ctype.h>
  37
  38 #include "urldata.h"
  39 #include "sendf.h"
  40 #include "strequal.h"
  41 #include "base64.h"
  42 #include "http_negotiate.h"
  43 #include "memory.h"
  44
  45 #define _MPRINTF_REPLACE /* use our functions only */
  46 #include <curl/mprintf.h>
  47
  48 /* The last #include file should be: */
  49 #include "memdebug.h"
  50
  51 static int
  52 get_gss_name(struct connectdata *conn, bool proxy, gss_name_t *server)
  53 {
  54   struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
  55     &conn->data->state.negotiate;
  56   OM_uint32 major_status, minor_status;
  57   gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
  58   char name[2048];
  59   const char* service;
  60
  61   /* GSSAPI implementation by Globus (known as GSI) requires the name to be
  62      of form "<service>/<fqdn>" instead of <service>@<fqdn> (ie. slash instead
  63      of at-sign). Also GSI servers are often identified as 'host' not 'khttp'.
  64      Change following lines if you want to use GSI */
  65
  66   /* IIS uses the <service>@<fqdn> form but uses 'http' as the service name */
  67
  68   if(neg_ctx->gss)
  69     service = "KHTTP";
  70   else
  71     service = "HTTP";
  72
  73   token.length = strlen(service) + 1 + strlen(proxy ? conn->proxy.name :
  74                                               conn->host.name) + 1;
  75   if(token.length + 1 > sizeof(name))
  76     return EMSGSIZE;
  77
  78   snprintf(name, sizeof(name), "%s@%s", service, proxy ? conn->proxy.name :
  79            conn->host.name);
  80
  81   token.value = (void *) name;
  82   major_status = gss_import_name(&minor_status,
  83                                  &token,
  84                                  GSS_C_NT_HOSTBASED_SERVICE,
  85                                  server);
  86
  87   return GSS_ERROR(major_status) ? -1 : 0;
  88 }
  89
  90 static void
  91 log_gss_error(struct connectdata *conn, OM_uint32 error_status, char *prefix)
  92 {
  93   OM_uint32 maj_stat, min_stat;
  94   OM_uint32 msg_ctx = 0;
  95   gss_buffer_desc status_string;
  96   char buf[1024];
  97   size_t len;
  98
  99   snprintf(buf, sizeof(buf), "%s", prefix);
 100   len = strlen(buf);
 101   do {
 102     maj_stat = gss_display_status(&min_stat,
 103                                   error_status,
 104                                   GSS_C_MECH_CODE,
 105                                   GSS_C_NO_OID,
 106                                   &msg_ctx,
 107                                   &status_string);
 108       if(sizeof(buf) > len + status_string.length + 1) {
 109         snprintf(buf + len, sizeof(buf) - len,
 110                  ": %s", (char*) status_string.value);
 111       len += status_string.length;
 112     }
 113     gss_release_buffer(&min_stat, &status_string);
 114   } while(!GSS_ERROR(maj_stat) && msg_ctx != 0);
 115
 116   infof(conn->data, "%s", buf);
 117 }
 118
 119 int Curl_input_negotiate(struct connectdata *conn, bool proxy,
 120                          const char *header)
 121 {
 122   struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
 123     &conn->data->state.negotiate;
 124   OM_uint32 major_status, minor_status, minor_status2;
 125   gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
 126   gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
 127   int ret;
 128   size_t len;
 129   bool gss;
 130   const char* protocol;
 131
 132   while(*header && ISSPACE(*header))
 133     header++;
 134   if(checkprefix("GSS-Negotiate", header)) {
 135     protocol = "GSS-Negotiate";
 136     gss = TRUE;
 137   }
 138   else if(checkprefix("Negotiate", header)) {
 139     protocol = "Negotiate";
 140     gss = FALSE;
 141   }
 142   else
 143     return -1;
 144
 145   if(neg_ctx->context) {
 146     if(neg_ctx->gss != gss) {
 147       return -1;
 148     }
 149   }
 150   else {
 151     neg_ctx->protocol = protocol;
 152     neg_ctx->gss = gss;
 153   }
 154
 155   if(neg_ctx->context && neg_ctx->status == GSS_S_COMPLETE) {
 156     /* We finished succesfully our part of authentication, but server
 157      * rejected it (since we're again here). Exit with an error since we
 158      * can't invent anything better */
 159     Curl_cleanup_negotiate(conn->data);
 160     return -1;
 161   }
 162
 163   if(neg_ctx->server_name == NULL &&
 164       (ret = get_gss_name(conn, proxy, &neg_ctx->server_name)))
 165     return ret;
 166
 167   header += strlen(neg_ctx->protocol);
 168   while(*header && ISSPACE(*header))
 169     header++;
 170
 171   len = strlen(header);
 172   if(len > 0) {
 173     int rawlen = Curl_base64_decode(header,
 174                                     (unsigned char **)&input_token.value);
 175     if(rawlen < 0)
 176       return -1;
 177     input_token.length = rawlen;
 178
 179 #ifdef HAVE_SPNEGO /* Handle SPNEGO */
 180     if(checkprefix("Negotiate", header)) {
 181         ASN1_OBJECT *   object            = NULL;
 182         int             rc                = 1;
 183         unsigned char * spnegoToken       = NULL;
 184         size_t          spnegoTokenLength = 0;
 185         unsigned char * mechToken         = NULL;
 186         size_t          mechTokenLength   = 0;
 187
 188         spnegoToken = malloc(input_token.length);
 189         if(input_token.value == NULL)
 190           return ENOMEM;
 191         spnegoTokenLength = input_token.length;
 192
 193         object = OBJ_txt2obj ("1.2.840.113554.1.2.2", 1);
 194         if(!parseSpnegoTargetToken(spnegoToken,
 195                                     spnegoTokenLength,
 196                                     NULL,
 197                                     NULL,
 198                                     &mechToken,
 199                                     &mechTokenLength,
 200                                     NULL,
 201                                     NULL)) {
 202           free(spnegoToken);
 203           spnegoToken = NULL;
 204           infof(conn->data, "Parse SPNEGO Target Token failed\n");
 205         }
 206         else {
 207           free(input_token.value);
 208           input_token.value = NULL;
 209           input_token.value = malloc(mechTokenLength);
 210           memcpy(input_token.value, mechToken,mechTokenLength);
 211           input_token.length = mechTokenLength;
 212           free(mechToken);
 213           mechToken = NULL;
 214           infof(conn->data, "Parse SPNEGO Target Token succeeded\n");
 215         }
 216     }
 217 #endif
 218   }
 219
 220   major_status = gss_init_sec_context(&minor_status,
 221                                       GSS_C_NO_CREDENTIAL,
 222                                       &neg_ctx->context,
 223                                       neg_ctx->server_name,
 224                                       GSS_C_NO_OID,
 225                                       GSS_C_DELEG_FLAG,
 226                                       0,
 227                                       GSS_C_NO_CHANNEL_BINDINGS,
 228                                       &input_token,
 229                                       NULL,
 230                                       &output_token,
 231                                       NULL,
 232                                       NULL);
 233   if(input_token.length > 0)
 234     gss_release_buffer(&minor_status2, &input_token);
 235   neg_ctx->status = major_status;
 236   if(GSS_ERROR(major_status)) {
 237     /* Curl_cleanup_negotiate(conn->data) ??? */
 238     log_gss_error(conn, minor_status,
 239                   (char *)"gss_init_sec_context() failed: ");
 240     return -1;
 241   }
 242
 243   if(output_token.length == 0) {
 244     return -1;
 245   }
 246
 247   neg_ctx->output_token = output_token;
 248   /* conn->bits.close = FALSE; */
 249
 250   return 0;
 251 }
 252
 253
 254 CURLcode Curl_output_negotiate(struct connectdata *conn, bool proxy)
 255 {
 256   struct negotiatedata *neg_ctx = proxy?&conn->data->state.proxyneg:
 257     &conn->data->state.negotiate;
 258   char *encoded = NULL;
 259   int len;
 260
 261 #ifdef HAVE_SPNEGO /* Handle SPNEGO */
 262   if(checkprefix("Negotiate", neg_ctx->protocol)) {
 263     ASN1_OBJECT *   object            = NULL;
 264     int             rc                = 1;
 265     unsigned char * spnegoToken       = NULL;
 266     size_t          spnegoTokenLength = 0;
 267     unsigned char * responseToken       = NULL;
 268     size_t          responseTokenLength = 0;
 269
 270     responseToken = malloc(neg_ctx->output_token.length);
 271     if( responseToken == NULL)
 272       return CURLE_OUT_OF_MEMORY;
 273     memcpy(responseToken, neg_ctx->output_token.value,
 274            neg_ctx->output_token.length);
 275     responseTokenLength = neg_ctx->output_token.length;
 276
 277     object=OBJ_txt2obj ("1.2.840.113554.1.2.2", 1);
 278     if(!makeSpnegoInitialToken (object,
 279                                  responseToken,
 280                                  responseTokenLength,
 281                                  &spnegoToken,
 282                                  &spnegoTokenLength)) {
 283       free(responseToken);
 284       responseToken = NULL;
 285       infof(conn->data, "Make SPNEGO Initial Token failed\n");
 286     }
 287     else {
 288       free(neg_ctx->output_token.value);
 289       responseToken = NULL;
 290       neg_ctx->output_token.value = malloc(spnegoTokenLength);
 291       memcpy(neg_ctx->output_token.value, spnegoToken,spnegoTokenLength);
 292       neg_ctx->output_token.length = spnegoTokenLength;
 293       free(spnegoToken);
 294       spnegoToken = NULL;
 295       infof(conn->data, "Make SPNEGO Initial Token succeeded\n");
 296     }
 297   }
 298 #endif
 299   len = Curl_base64_encode(conn->data,
 300                            neg_ctx->output_token.value,
 301                            neg_ctx->output_token.length,
 302                            &encoded);
 303
 304   if(len == 0)
 305     return CURLE_OUT_OF_MEMORY;
 306
 307   conn->allocptr.userpwd =
 308     aprintf("%sAuthorization: %s %s\r\n", proxy ? "Proxy-" : "",
 309             neg_ctx->protocol, encoded);
 310   free(encoded);
 311   Curl_cleanup_negotiate (conn->data);
 312   return (conn->allocptr.userpwd == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
 313 }
 314
 315 static void cleanup(struct negotiatedata *neg_ctx)
 316 {
 317   OM_uint32 minor_status;
 318   if(neg_ctx->context != GSS_C_NO_CONTEXT)
 319     gss_delete_sec_context(&minor_status, &neg_ctx->context, GSS_C_NO_BUFFER);
 320
 321   if(neg_ctx->output_token.length != 0)
 322     gss_release_buffer(&minor_status, &neg_ctx->output_token);
 323
 324   if(neg_ctx->server_name != GSS_C_NO_NAME)
 325     gss_release_name(&minor_status, &neg_ctx->server_name);
 326
 327   memset(neg_ctx, 0, sizeof(*neg_ctx));
 328 }
 329
 330 void Curl_cleanup_negotiate(struct SessionHandle *data)
 331 {
 332   cleanup(&data->state.negotiate);
 333   cleanup(&data->state.proxyneg);
 334 }
 335
 336
 337 #endif
 338 #endif