lib/http_negotiate.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 1998 - 2004, 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 #include <errno.h>
  38
  39 #include "urldata.h"
  40 #include "sendf.h"
  41 #include "strequal.h"
  42 #include "base64.h"
  43 #include "http_negotiate.h"
  44 #include "memory.h"
  45
  46 #define _MPRINTF_REPLACE /* use our functions only */
  47 #include <curl/mprintf.h>
  48
  49 /* The last #include file should be: */
  50 #include "memdebug.h"
  51
  52 static int
  53 get_gss_name(struct connectdata *conn, gss_name_t *server)
  54 {
  55   struct negotiatedata *neg_ctx = &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(conn->host.name) + 1;
  74   if (token.length + 1 > sizeof(name))
  75     return EMSGSIZE;
  76
  77   snprintf(name, sizeof(name), "%s@%s", service, conn->host.name);
  78
  79   token.value = (void *) name;
  80   major_status = gss_import_name(&minor_status,
  81                                  &token,
  82                                  GSS_C_NT_HOSTBASED_SERVICE,
  83                                  server);
  84
  85   return GSS_ERROR(major_status) ? -1 : 0;
  86 }
  87
  88 static void
  89 log_gss_error(struct connectdata *conn, OM_uint32 error_status, char *prefix)
  90 {
  91   OM_uint32 maj_stat, min_stat;
  92   OM_uint32 msg_ctx = 0;
  93   gss_buffer_desc status_string;
  94   char buf[1024];
  95   size_t len;
  96
  97   snprintf(buf, sizeof(buf), "%s", prefix);
  98   len = strlen(buf);
  99   do {
 100     maj_stat = gss_display_status (&min_stat,
 101                                    error_status,
 102                                    GSS_C_MECH_CODE,
 103                                    GSS_C_NO_OID,
 104                                    &msg_ctx,
 105                                    &status_string);
 106       if (sizeof(buf) > len + status_string.length + 1) {
 107         snprintf(buf + len, sizeof(buf) - len,
 108                  ": %s", (char*) status_string.value);
 109       len += status_string.length;
 110     }
 111     gss_release_buffer(&min_stat, &status_string);
 112   } while (!GSS_ERROR(maj_stat) && msg_ctx != 0);
 113
 114   infof(conn->data, buf);
 115 }
 116
 117 int Curl_input_negotiate(struct connectdata *conn, char *header)
 118 {
 119   struct negotiatedata *neg_ctx = &conn->data->state.negotiate;
 120   OM_uint32 major_status, minor_status, minor_status2;
 121   gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
 122   gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
 123   int ret;
 124   size_t len;
 125   bool gss;
 126   const char* protocol;
 127
 128   while(*header && isspace((int)*header))
 129     header++;
 130   if(checkprefix("GSS-Negotiate", header)) {
 131     protocol = "GSS-Negotiate";
 132     gss = TRUE;
 133   }
 134   else if (checkprefix("Negotiate", header)) {
 135     protocol = "Negotiate";
 136     gss = FALSE;
 137   }
 138   else
 139     return -1;
 140
 141   if (neg_ctx->context) {
 142     if (neg_ctx->gss != gss) {
 143       return -1;
 144     }
 145   }
 146   else {
 147     neg_ctx->protocol = protocol;
 148     neg_ctx->gss = gss;
 149   }
 150
 151   if (neg_ctx->context && neg_ctx->status == GSS_S_COMPLETE) {
 152     /* We finished succesfully our part of authentication, but server
 153      * rejected it (since we're again here). Exit with an error since we
 154      * can't invent anything better */
 155     Curl_cleanup_negotiate(conn->data);
 156     return -1;
 157   }
 158
 159   if (neg_ctx->server_name == NULL &&
 160       (ret = get_gss_name(conn, &neg_ctx->server_name)))
 161     return ret;
 162
 163   header += strlen(neg_ctx->protocol);
 164   while(*header && isspace((int)*header))
 165     header++;
 166
 167   len = strlen(header);
 168   if (len > 0) {
 169     int rawlen;
 170     input_token.length = (len+3)/4 * 3;
 171     input_token.value = malloc(input_token.length);
 172     if (input_token.value == NULL)
 173       return ENOMEM;
 174     rawlen = Curl_base64_decode(header, 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 succeded\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)
 255 {
 256   struct negotiatedata *neg_ctx = &conn->data->state.negotiate;
 257   OM_uint32 minor_status;
 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 succeded\n");
 296     }
 297   }
 298 #endif
 299   len = Curl_base64_encode(neg_ctx->output_token.value,
 300                            neg_ctx->output_token.length,
 301                            &encoded);
 302
 303   if (len < 0)
 304     return CURLE_OUT_OF_MEMORY;
 305
 306   conn->allocptr.userpwd =
 307     aprintf("Authorization: %s %s\r\n", neg_ctx->protocol, encoded);
 308   free(encoded);
 309   gss_release_buffer(&minor_status, &neg_ctx->output_token);
 310   return (conn->allocptr.userpwd == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
 311 }
 312
 313 void Curl_cleanup_negotiate(struct SessionHandle *data)
 314 {
 315   OM_uint32 minor_status;
 316   struct negotiatedata *neg_ctx = &data->state.negotiate;
 317
 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
 331 #endif
 332 #endif