lib/http_negotiate.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 1998 - 2007, 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_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, gss_name_t *server)
  53 {
  54   struct negotiatedata *neg_ctx = &conn->data->state.negotiate;
  55   OM_uint32 major_status, minor_status;
  56   gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
  57   char name[2048];
  58   const char* service;
  59
  60   /* GSSAPI implementation by Globus (known as GSI) requires the name to be
  61      of form "<service>/<fqdn>" instead of <service>@<fqdn> (ie. slash instead
  62      of at-sign). Also GSI servers are often identified as 'host' not 'khttp'.
  63      Change following lines if you want to use GSI */
  64
  65   /* IIS uses the <service>@<fqdn> form but uses 'http' as the service name */
  66
  67   if (neg_ctx->gss)
  68     service = "KHTTP";
  69   else
  70     service = "HTTP";
  71
  72   token.length = strlen(service) + 1 + strlen(conn->host.name) + 1;
  73   if (token.length + 1 > sizeof(name))
  74     return EMSGSIZE;
  75
  76   snprintf(name, sizeof(name), "%s@%s", service, conn->host.name);
  77
  78   token.value = (void *) name;
  79   major_status = gss_import_name(&minor_status,
  80                                  &token,
  81                                  GSS_C_NT_HOSTBASED_SERVICE,
  82                                  server);
  83
  84   return GSS_ERROR(major_status) ? -1 : 0;
  85 }
  86
  87 static void
  88 log_gss_error(struct connectdata *conn, OM_uint32 error_status, char *prefix)
  89 {
  90   OM_uint32 maj_stat, min_stat;
  91   OM_uint32 msg_ctx = 0;
  92   gss_buffer_desc status_string;
  93   char buf[1024];
  94   size_t len;
  95
  96   snprintf(buf, sizeof(buf), "%s", prefix);
  97   len = strlen(buf);
  98   do {
  99     maj_stat = gss_display_status (&min_stat,
 100                                    error_status,
 101                                    GSS_C_MECH_CODE,
 102                                    GSS_C_NO_OID,
 103                                    &msg_ctx,
 104                                    &status_string);
 105       if (sizeof(buf) > len + status_string.length + 1) {
 106         snprintf(buf + len, sizeof(buf) - len,
 107                  ": %s", (char*) status_string.value);
 108       len += status_string.length;
 109     }
 110     gss_release_buffer(&min_stat, &status_string);
 111   } while (!GSS_ERROR(maj_stat) && msg_ctx != 0);
 112
 113   infof(conn->data, "%s", buf);
 114 }
 115
 116 int Curl_input_negotiate(struct connectdata *conn, char *header)
 117 {
 118   struct negotiatedata *neg_ctx = &conn->data->state.negotiate;
 119   OM_uint32 major_status, minor_status, minor_status2;
 120   gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
 121   gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
 122   int ret;
 123   size_t len;
 124   bool gss;
 125   const char* protocol;
 126
 127   while(*header && ISSPACE(*header))
 128     header++;
 129   if(checkprefix("GSS-Negotiate", header)) {
 130     protocol = "GSS-Negotiate";
 131     gss = TRUE;
 132   }
 133   else if (checkprefix("Negotiate", header)) {
 134     protocol = "Negotiate";
 135     gss = FALSE;
 136   }
 137   else
 138     return -1;
 139
 140   if (neg_ctx->context) {
 141     if (neg_ctx->gss != gss) {
 142       return -1;
 143     }
 144   }
 145   else {
 146     neg_ctx->protocol = protocol;
 147     neg_ctx->gss = gss;
 148   }
 149
 150   if (neg_ctx->context && neg_ctx->status == GSS_S_COMPLETE) {
 151     /* We finished succesfully our part of authentication, but server
 152      * rejected it (since we're again here). Exit with an error since we
 153      * can't invent anything better */
 154     Curl_cleanup_negotiate(conn->data);
 155     return -1;
 156   }
 157
 158   if (neg_ctx->server_name == NULL &&
 159       (ret = get_gss_name(conn, &neg_ctx->server_name)))
 160     return ret;
 161
 162   header += strlen(neg_ctx->protocol);
 163   while(*header && ISSPACE(*header))
 164     header++;
 165
 166   len = strlen(header);
 167   if (len > 0) {
 168     int rawlen = Curl_base64_decode(header, (unsigned char **)&input_token.value);
 169     if (rawlen < 0)
 170       return -1;
 171     input_token.length = rawlen;
 172
 173 #ifdef HAVE_SPNEGO /* Handle SPNEGO */
 174     if (checkprefix("Negotiate", header)) {
 175         ASN1_OBJECT *   object            = NULL;
 176         int             rc                = 1;
 177         unsigned char * spnegoToken       = NULL;
 178         size_t          spnegoTokenLength = 0;
 179         unsigned char * mechToken         = NULL;
 180         size_t          mechTokenLength   = 0;
 181
 182         spnegoToken = malloc(input_token.length);
 183         if (input_token.value == NULL)
 184           return ENOMEM;
 185         spnegoTokenLength = input_token.length;
 186
 187         object = OBJ_txt2obj ("1.2.840.113554.1.2.2", 1);
 188         if (!parseSpnegoTargetToken(spnegoToken,
 189                                     spnegoTokenLength,
 190                                     NULL,
 191                                     NULL,
 192                                     &mechToken,
 193                                     &mechTokenLength,
 194                                     NULL,
 195                                     NULL)) {
 196           free(spnegoToken);
 197           spnegoToken = NULL;
 198           infof(conn->data, "Parse SPNEGO Target Token failed\n");
 199         }
 200         else {
 201           free(input_token.value);
 202           input_token.value = NULL;
 203           input_token.value = malloc(mechTokenLength);
 204           memcpy(input_token.value, mechToken,mechTokenLength);
 205           input_token.length = mechTokenLength;
 206           free(mechToken);
 207           mechToken = NULL;
 208           infof(conn->data, "Parse SPNEGO Target Token succeeded\n");
 209         }
 210     }
 211 #endif
 212   }
 213
 214   major_status = gss_init_sec_context(&minor_status,
 215                                       GSS_C_NO_CREDENTIAL,
 216                                       &neg_ctx->context,
 217                                       neg_ctx->server_name,
 218                                       GSS_C_NO_OID,
 219                                       GSS_C_DELEG_FLAG,
 220                                       0,
 221                                       GSS_C_NO_CHANNEL_BINDINGS,
 222                                       &input_token,
 223                                       NULL,
 224                                       &output_token,
 225                                       NULL,
 226                                       NULL);
 227   if (input_token.length > 0)
 228     gss_release_buffer(&minor_status2, &input_token);
 229   neg_ctx->status = major_status;
 230   if (GSS_ERROR(major_status)) {
 231     /* Curl_cleanup_negotiate(conn->data) ??? */
 232     log_gss_error(conn, minor_status,
 233                   (char *)"gss_init_sec_context() failed: ");
 234     return -1;
 235   }
 236
 237   if (output_token.length == 0) {
 238     return -1;
 239   }
 240
 241   neg_ctx->output_token = output_token;
 242   /* conn->bits.close = FALSE; */
 243
 244   return 0;
 245 }
 246
 247
 248 CURLcode Curl_output_negotiate(struct connectdata *conn)
 249 {
 250   struct negotiatedata *neg_ctx = &conn->data->state.negotiate;
 251   OM_uint32 minor_status;
 252   char *encoded = NULL;
 253   int len;
 254
 255 #ifdef HAVE_SPNEGO /* Handle SPNEGO */
 256   if (checkprefix("Negotiate",neg_ctx->protocol)) {
 257     ASN1_OBJECT *   object            = NULL;
 258     int             rc                = 1;
 259     unsigned char * spnegoToken       = NULL;
 260     size_t          spnegoTokenLength = 0;
 261     unsigned char * responseToken       = NULL;
 262     size_t          responseTokenLength = 0;
 263
 264     responseToken = malloc(neg_ctx->output_token.length);
 265     if ( responseToken == NULL)
 266       return CURLE_OUT_OF_MEMORY;
 267     memcpy(responseToken, neg_ctx->output_token.value,
 268            neg_ctx->output_token.length);
 269     responseTokenLength = neg_ctx->output_token.length;
 270
 271     object=OBJ_txt2obj ("1.2.840.113554.1.2.2", 1);
 272     if (!makeSpnegoInitialToken (object,
 273                                  responseToken,
 274                                  responseTokenLength,
 275                                  &spnegoToken,
 276                                  &spnegoTokenLength)) {
 277       free(responseToken);
 278       responseToken = NULL;
 279       infof(conn->data, "Make SPNEGO Initial Token failed\n");
 280     }
 281     else {
 282       free(neg_ctx->output_token.value);
 283       responseToken = NULL;
 284       neg_ctx->output_token.value = malloc(spnegoTokenLength);
 285       memcpy(neg_ctx->output_token.value, spnegoToken,spnegoTokenLength);
 286       neg_ctx->output_token.length = spnegoTokenLength;
 287       free(spnegoToken);
 288       spnegoToken = NULL;
 289       infof(conn->data, "Make SPNEGO Initial Token succeeded\n");
 290     }
 291   }
 292 #endif
 293   len = Curl_base64_encode(conn->data,
 294                            neg_ctx->output_token.value,
 295                            neg_ctx->output_token.length,
 296                            &encoded);
 297
 298   if (len < 0)
 299     return CURLE_OUT_OF_MEMORY;
 300
 301   conn->allocptr.userpwd =
 302     aprintf("Authorization: %s %s\r\n", neg_ctx->protocol, encoded);
 303   free(encoded);
 304   gss_release_buffer(&minor_status, &neg_ctx->output_token);
 305   return (conn->allocptr.userpwd == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
 306 }
 307
 308 void Curl_cleanup_negotiate(struct SessionHandle *data)
 309 {
 310   OM_uint32 minor_status;
 311   struct negotiatedata *neg_ctx = &data->state.negotiate;
 312
 313   if (neg_ctx->context != GSS_C_NO_CONTEXT)
 314     gss_delete_sec_context(&minor_status, &neg_ctx->context, GSS_C_NO_BUFFER);
 315
 316   if (neg_ctx->output_token.length != 0)
 317     gss_release_buffer(&minor_status, &neg_ctx->output_token);
 318
 319   if (neg_ctx->server_name != GSS_C_NO_NAME)
 320     gss_release_name(&minor_status, &neg_ctx->server_name);
 321
 322   memset(neg_ctx, 0, sizeof(*neg_ctx));
 323 }
 324
 325
 326 #endif
 327 #endif