neo/curl/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: http_negotiate.c,v 1.7 2004/01/07 09:19:35 bagder Exp $
  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
  45 #define _MPRINTF_REPLACE /* use our functions only */
  46 #include <curl/mprintf.h>
  47
  48 /* The last #include file should be: */
  49 #ifdef CURLDEBUG
  50 #include "memdebug.h"
  51 #endif
  52
  53 static int
  54 get_gss_name(struct connectdata *conn, gss_name_t *server)
  55 {
  56   struct negotiatedata *neg_ctx = &conn->data->state.negotiate;
  57   OM_uint32 major_status, minor_status;
  58   gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
  59   char name[2048];
  60   const char* service;
  61
  62   /* GSSAPI implementation by Globus (known as GSI) requires the name to be
  63      of form "<service>/<fqdn>" instead of <service>@<fqdn> (ie. slash instead
  64      of at-sign). Also GSI servers are often identified as 'host' not 'khttp'.
  65      Change following lines if you want to use GSI */
  66
  67   /* IIS uses the <service>@<fqdn> form but uses 'http' as the service name */
  68
  69   if (neg_ctx->gss)
  70     service = "khttp";
  71   else
  72     service = "http";
  73
  74   token.length = strlen(service) + 1 + strlen(conn->hostname) + 1;
  75   if (token.length + 1 > sizeof(name))
  76     return EMSGSIZE;
  77   sprintf(name, "%s@%s", service, conn->hostname);
  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       sprintf(buf + len, ": %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, 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((int)*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((int)*header))
 164     header++;
 165
 166   len = strlen(header);
 167   if (len > 0) {
 168     int rawlen;
 169     input_token.length = (len+3)/4 * 3;
 170     input_token.value = malloc(input_token.length);
 171     if (input_token.value == NULL)
 172       return ENOMEM;
 173     rawlen = Curl_base64_decode(header, input_token.value);
 174     if (rawlen < 0)
 175       return -1;
 176     input_token.length = rawlen;
 177
 178 #ifdef HAVE_SPNEGO /* Handle SPNEGO */
 179     if (checkprefix("Negotiate", header)) {
 180         ASN1_OBJECT *   object            = NULL;
 181         int             rc                = 1;
 182         unsigned char * spnegoToken       = NULL;
 183         size_t          spnegoTokenLength = 0;
 184         unsigned char * mechToken         = NULL;
 185         size_t          mechTokenLength   = 0;
 186
 187         spnegoToken = malloc(input_token.length);
 188         if (input_token.value == NULL)
 189           return ENOMEM;
 190         spnegoTokenLength = input_token.length;
 191
 192         object = OBJ_txt2obj ("1.2.840.113554.1.2.2", 1);
 193         if (!parseSpnegoTargetToken(spnegoToken,
 194                                     spnegoTokenLength,
 195                                     NULL,
 196                                     NULL,
 197                                     &mechToken,
 198                                     &mechTokenLength,
 199                                     NULL,
 200                                     NULL)) {
 201           free(spnegoToken);
 202           spnegoToken = NULL;
 203           infof(conn->data, "Parse SPNEGO Target Token failed\n");
 204         }
 205         else {
 206           free(input_token.value);
 207           input_token.value = NULL;
 208           input_token.value = malloc(mechTokenLength);
 209           memcpy(input_token.value, mechToken,mechTokenLength);
 210           input_token.length = mechTokenLength;
 211           free(mechToken);
 212           mechToken = NULL;
 213           infof(conn->data, "Parse SPNEGO Target Token succeded\n");
 214         }
 215     }
 216 #endif
 217   }
 218
 219   major_status = gss_init_sec_context(&minor_status,
 220                                       GSS_C_NO_CREDENTIAL,
 221                                       &neg_ctx->context,
 222                                       neg_ctx->server_name,
 223                                       GSS_C_NO_OID,
 224                                       GSS_C_DELEG_FLAG,
 225                                       0,
 226                                       GSS_C_NO_CHANNEL_BINDINGS,
 227                                       &input_token,
 228                                       NULL,
 229                                       &output_token,
 230                                       NULL,
 231                                       NULL);
 232   if (input_token.length > 0)
 233     gss_release_buffer(&minor_status2, &input_token);
 234   neg_ctx->status = major_status;
 235   if (GSS_ERROR(major_status)) {
 236     /* Curl_cleanup_negotiate(conn->data) ??? */
 237     log_gss_error(conn, minor_status,
 238                   (char *)"gss_init_sec_context() failed: ");
 239     return -1;
 240   }
 241
 242   if (output_token.length == 0) {
 243     return -1;
 244   }
 245
 246   neg_ctx->output_token = output_token;
 247   /* conn->bits.close = FALSE; */
 248
 249   return 0;
 250 }
 251
 252
 253 CURLcode Curl_output_negotiate(struct connectdata *conn)
 254 {
 255   struct negotiatedata *neg_ctx = &conn->data->state.negotiate;
 256   OM_uint32 minor_status;
 257   char *encoded = NULL;
 258   int len;
 259
 260 #ifdef HAVE_SPNEGO /* Handle SPNEGO */
 261   if (checkprefix("Negotiate",neg_ctx->protocol)) {
 262     ASN1_OBJECT *   object            = NULL;
 263     int             rc                = 1;
 264     unsigned char * spnegoToken       = NULL;
 265     size_t          spnegoTokenLength = 0;
 266     unsigned char * responseToken       = NULL;
 267     size_t          responseTokenLength = 0;
 268
 269     responseToken = malloc(neg_ctx->output_token.length);
 270     if ( responseToken == NULL)
 271       return CURLE_OUT_OF_MEMORY;
 272     memcpy(responseToken, neg_ctx->output_token.value,
 273            neg_ctx->output_token.length);
 274     responseTokenLength = neg_ctx->output_token.length;
 275
 276     object=OBJ_txt2obj ("1.2.840.113554.1.2.2", 1);
 277     if (!makeSpnegoInitialToken (object,
 278                                  responseToken,
 279                                  responseTokenLength,
 280                                  &spnegoToken,
 281                                  &spnegoTokenLength)) {
 282       free(responseToken);
 283       responseToken = NULL;
 284       infof(conn->data, "Make SPNEGO Initial Token failed\n");
 285     }
 286     else {
 287       free(neg_ctx->output_token.value);
 288       responseToken = NULL;
 289       neg_ctx->output_token.value = malloc(spnegoTokenLength);
 290       memcpy(neg_ctx->output_token.value, spnegoToken,spnegoTokenLength);
 291       neg_ctx->output_token.length = spnegoTokenLength;
 292       free(spnegoToken);
 293       spnegoToken = NULL;
 294       infof(conn->data, "Make SPNEGO Initial Token succeded\n");
 295     }
 296   }
 297 #endif
 298   len = Curl_base64_encode(neg_ctx->output_token.value,
 299                            neg_ctx->output_token.length,
 300                            &encoded);
 301
 302   if (len < 0)
 303     return CURLE_OUT_OF_MEMORY;
 304
 305   conn->allocptr.userpwd =
 306     aprintf("Authorization: %s %s\r\n", neg_ctx->protocol, encoded);
 307   free(encoded);
 308   gss_release_buffer(&minor_status, &neg_ctx->output_token);
 309   return (conn->allocptr.userpwd == NULL) ? CURLE_OUT_OF_MEMORY : CURLE_OK;
 310 }
 311
 312 void Curl_cleanup_negotiate(struct SessionHandle *data)
 313 {
 314   OM_uint32 minor_status;
 315   struct negotiatedata *neg_ctx = &data->state.negotiate;
 316
 317   if (neg_ctx->context != GSS_C_NO_CONTEXT)
 318     gss_delete_sec_context(&minor_status, &neg_ctx->context, GSS_C_NO_BUFFER);
 319
 320   if (neg_ctx->output_token.length != 0)
 321     gss_release_buffer(&minor_status, &neg_ctx->output_token);
 322
 323   if (neg_ctx->server_name != GSS_C_NO_NAME)
 324     gss_release_name(&minor_status, &neg_ctx->server_name);
 325
 326   memset(neg_ctx, 0, sizeof(*neg_ctx));
 327 }
 328
 329
 330 #endif
 331 #endif