init_sec_context.c

   1 /*
   2  * Copyright (c) 2010, JANET(UK)
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of JANET(UK) nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include "gssapiP_eap.h"
  34
  35 static OM_uint32
  36 policyVariableToFlag(enum eapol_bool_var variable)
  37 {
  38     OM_uint32 flag = 0;
  39
  40     switch (variable) {
  41     case EAPOL_eapSuccess:
  42         flag = CTX_FLAG_EAP_SUCCESS;
  43         break;
  44     case EAPOL_eapRestart:
  45         flag = CTX_FLAG_EAP_RESTART;
  46         break;
  47     case EAPOL_eapFail:
  48         flag = CTX_FLAG_EAP_FAIL;
  49         break;
  50     case EAPOL_eapResp:
  51         flag = CTX_FLAG_EAP_RESP;
  52         break;
  53     case EAPOL_eapNoResp:
  54         flag = CTX_FLAG_EAP_NO_RESP;
  55         break;
  56     case EAPOL_eapReq:
  57         flag = CTX_FLAG_EAP_REQ;
  58         break;
  59     case EAPOL_portEnabled:
  60         flag = CTX_FLAG_EAP_PORT_ENABLED;
  61         break;
  62     case EAPOL_altAccept:
  63         flag = CTX_FLAG_EAP_ALT_ACCEPT;
  64         break;
  65     case EAPOL_altReject:
  66         flag = CTX_FLAG_EAP_ALT_REJECT;
  67         break;
  68     }
  69
  70     return flag;
  71
  72 }
  73
  74 static struct eap_peer_config *
  75 peerGetConfig(void *ctx)
  76 {
  77     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
  78
  79     return &gssCtx->initiatorCtx.eapPeerConfig;
  80 }
  81
  82 static Boolean
  83 peerGetBool(void *data, enum eapol_bool_var variable)
  84 {
  85     gss_ctx_id_t ctx = data;
  86     OM_uint32 flag;
  87
  88     if (ctx == GSS_C_NO_CONTEXT)
  89         return FALSE;
  90
  91     flag = policyVariableToFlag(variable);
  92
  93     return ((ctx->flags & flag) != 0);
  94 }
  95
  96 static void
  97 peerSetBool(void *data, enum eapol_bool_var variable,
  98             Boolean value)
  99 {
 100     gss_ctx_id_t ctx = data;
 101     OM_uint32 flag;
 102
 103     if (ctx == GSS_C_NO_CONTEXT)
 104         return;
 105
 106     flag = policyVariableToFlag(variable);
 107
 108     if (value)
 109         ctx->flags |= flag;
 110     else
 111         ctx->flags &= ~(flag);
 112 }
 113
 114 static unsigned int
 115 peerGetInt(void *data, enum eapol_int_var variable)
 116 {
 117     gss_ctx_id_t ctx = data;
 118
 119     if (ctx == GSS_C_NO_CONTEXT)
 120         return FALSE;
 121
 122     assert(CTX_IS_INITIATOR(ctx));
 123
 124     switch (variable) {
 125     case EAPOL_idleWhile:
 126         return ctx->initiatorCtx.idleWhile;
 127         break;
 128     }
 129
 130     return 0;
 131 }
 132
 133 static void
 134 peerSetInt(void *data, enum eapol_int_var variable,
 135            unsigned int value)
 136 {
 137     gss_ctx_id_t ctx = data;
 138
 139     if (ctx == GSS_C_NO_CONTEXT)
 140         return;
 141
 142     assert(CTX_IS_INITIATOR(ctx));
 143
 144     switch (variable) {
 145     case EAPOL_idleWhile:
 146         ctx->initiatorCtx.idleWhile = value;
 147         break;
 148     }
 149 }
 150
 151 static struct wpabuf *
 152 peerGetEapReqData(void *ctx)
 153 {
 154     gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
 155
 156     return &gssCtx->initiatorCtx.reqData;
 157 }
 158
 159 static void
 160 peerSetConfigBlob(void *ctx, struct wpa_config_blob *blob)
 161 {
 162 }
 163
 164 static const struct wpa_config_blob *
 165 peerGetConfigBlob(void *ctx, const char *name)
 166 {
 167     return NULL;
 168 }
 169
 170 static void
 171 peerNotifyPending(void *ctx)
 172 {
 173 }
 174
 175 static struct eapol_callbacks gssEapPolicyCallbacks = {
 176     peerGetConfig,
 177     peerGetBool,
 178     peerSetBool,
 179     peerGetInt,
 180     peerSetInt,
 181     peerGetEapReqData,
 182     peerSetConfigBlob,
 183     peerGetConfigBlob,
 184     peerNotifyPending,
 185 };
 186
 187 extern int wpa_debug_level;
 188
 189 static OM_uint32
 190 peerConfigInit(OM_uint32 *minor,
 191                gss_cred_id_t cred,
 192                gss_ctx_id_t ctx,
 193                int loadConfig)
 194 {
 195     krb5_context krbContext;
 196     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 197     krb5_error_code code;
 198     char *identity;
 199
 200     GSSEAP_KRB_INIT(&krbContext);
 201
 202     if (loadConfig) {
 203         eapPeerConfig->fragment_size = 1024;
 204         wpa_debug_level = 0;
 205     }
 206
 207     code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
 208     if (code != 0) {
 209         *minor = code;
 210         return GSS_S_FAILURE;
 211     }
 212
 213     eapPeerConfig->identity = (unsigned char *)identity;
 214     eapPeerConfig->identity_len = strlen(identity);
 215     eapPeerConfig->password = (unsigned char *)cred->password.value;
 216     eapPeerConfig->password_len = cred->password.length;
 217
 218     return GSS_S_COMPLETE;
 219 }
 220
 221 static OM_uint32
 222 peerConfigFree(OM_uint32 *minor,
 223                gss_ctx_id_t ctx)
 224 {
 225     krb5_context krbContext;
 226     struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
 227
 228     GSSEAP_KRB_INIT(&krbContext);
 229
 230     krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
 231
 232     return GSS_S_COMPLETE;
 233 }
 234
 235 static OM_uint32
 236 initReady(OM_uint32 *minor, gss_ctx_id_t ctx)
 237 {
 238     OM_uint32 major;
 239     const unsigned char *key;
 240     size_t keyLength;
 241
 242     /* Cache encryption type derived from selected mechanism OID */
 243     major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
 244     if (GSS_ERROR(major))
 245         return major;
 246
 247     if (ctx->encryptionType != ENCTYPE_NULL &&
 248         eap_key_available(ctx->initiatorCtx.eap)) {
 249         key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
 250
 251         major = gssEapDeriveRfc3961Key(minor, key, keyLength,
 252                                        ctx->encryptionType, &ctx->rfc3961Key);
 253         if (GSS_ERROR(major))
 254             return major;
 255
 256         major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 257                                            &ctx->checksumType);
 258         if (GSS_ERROR(major))
 259             return major;
 260     } else {
 261         /*
 262          * draft-howlett-eap-gss says that integrity/confidentialty should
 263          * always be advertised as available, but if we have no keying
 264          * material it seems confusing to the caller to advertise this.
 265          */
 266         ctx->gssFlags &= ~(GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG);
 267     }
 268
 269     major = sequenceInit(minor,
 270                          &ctx->seqState,
 271                          ctx->recvSeq,
 272                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 273                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 274                          TRUE);
 275     if (GSS_ERROR(major))
 276         return major;
 277
 278     return GSS_S_COMPLETE;
 279 }
 280
 281 static OM_uint32
 282 eapGssSmInitAuthenticate(OM_uint32 *minor,
 283                          gss_cred_id_t cred,
 284                          gss_ctx_id_t ctx,
 285                          gss_name_t target,
 286                          gss_OID mech,
 287                          OM_uint32 reqFlags,
 288                          OM_uint32 timeReq,
 289                          gss_channel_bindings_t chanBindings,
 290                          gss_buffer_t inputToken,
 291                          gss_buffer_t outputToken)
 292 {
 293     OM_uint32 major;
 294     OM_uint32 tmpMajor, tmpMinor;
 295     time_t now;
 296     int initialContextToken = 0, code;
 297     gss_buffer_desc respBuf;
 298
 299     respBuf.length = 0;
 300     respBuf.value = NULL;
 301
 302     initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
 303                            inputToken->length == 0);
 304
 305     major = peerConfigInit(minor, cred, ctx, initialContextToken);
 306     if (GSS_ERROR(major))
 307         goto cleanup;
 308
 309     if (initialContextToken) {
 310         struct eap_config eapConfig;
 311
 312         memset(&eapConfig, 0, sizeof(eapConfig));
 313         ctx->flags |= CTX_FLAG_EAP_PORT_ENABLED;
 314
 315         ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
 316                                                  &gssEapPolicyCallbacks,
 317                                                  ctx,
 318                                                  &eapConfig);
 319
 320         time(&now);
 321         if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
 322             ctx->expiryTime = 0;
 323         else
 324             ctx->expiryTime = now + timeReq;
 325
 326         major = gss_duplicate_name(minor, cred->name, &ctx->initiatorName);
 327         if (GSS_ERROR(major))
 328             goto cleanup;
 329
 330         major = gss_duplicate_name(minor, target, &ctx->acceptorName);
 331         if (GSS_ERROR(major))
 332             goto cleanup;
 333
 334         if (mech == GSS_C_NULL_OID || oidEqual(mech, GSS_EAP_MECHANISM)) {
 335             major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
 336         } else if (gssEapIsConcreteMechanismOid(mech)) {
 337             if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
 338                 major = duplicateOid(minor, mech, &ctx->mechanismUsed);
 339         } else {
 340             major = GSS_S_BAD_MECH;
 341         }
 342         if (GSS_ERROR(major))
 343             goto cleanup;
 344
 345         /* If credentials were provided, check they're usable with this mech */
 346         if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
 347             major = GSS_S_BAD_MECH;
 348             goto cleanup;
 349         }
 350
 351         respBuf.value = ""; /* emit empty inner token */
 352         major = GSS_S_CONTINUE_NEEDED;
 353         goto cleanup;
 354     } else {
 355         ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
 356     }
 357
 358     wpabuf_set(&ctx->initiatorCtx.reqData,
 359                inputToken->value, inputToken->length);
 360
 361     major = GSS_S_CONTINUE_NEEDED;
 362
 363     code = eap_peer_sm_step(ctx->initiatorCtx.eap);
 364     if (ctx->flags & CTX_FLAG_EAP_RESP) {
 365         struct wpabuf *resp;
 366
 367         ctx->flags &= ~(CTX_FLAG_EAP_RESP);
 368
 369         resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
 370         if (resp != NULL) {
 371             respBuf.length = wpabuf_len(resp);
 372             respBuf.value = (void *)wpabuf_head(resp);
 373         }
 374     } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
 375         major = initReady(minor, ctx);
 376         if (GSS_ERROR(major))
 377             goto cleanup;
 378
 379         ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
 380         major = GSS_S_CONTINUE_NEEDED;
 381         ctx->state = EAP_STATE_GSS_CHANNEL_BINDINGS;
 382     } else if ((ctx->flags & CTX_FLAG_EAP_FAIL) || code == 0) {
 383         major = GSS_S_FAILURE;
 384     }
 385
 386 cleanup:
 387     if (respBuf.value != NULL) {
 388         OM_uint32 tmpMajor;
 389
 390         assert(major == GSS_S_CONTINUE_NEEDED);
 391
 392         tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
 393         if (GSS_ERROR(tmpMajor)) {
 394             major = tmpMajor;
 395             *minor = tmpMinor;
 396         }
 397     }
 398
 399     wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
 400     peerConfigFree(&tmpMinor, ctx);
 401
 402     return major;
 403 }
 404
 405 #if 0
 406 static OM_uint32
 407 eapGssSmInitKeyTransport(OM_uint32 *minor,
 408                          gss_cred_id_t cred,
 409                          gss_ctx_id_t ctx,
 410                          gss_name_t target,
 411                          gss_OID mech,
 412                          OM_uint32 reqFlags,
 413                          OM_uint32 timeReq,
 414                          gss_channel_bindings_t chanBindings,
 415                          gss_buffer_t inputToken,
 416                          gss_buffer_t outputToken)
 417 {
 418     GSSEAP_NOT_IMPLEMENTED;
 419 }
 420
 421 static OM_uint32
 422 eapGssSmInitSecureAssoc(OM_uint32 *minor,
 423                         gss_cred_id_t cred,
 424                         gss_ctx_id_t ctx,
 425                         gss_name_t target,
 426                         gss_OID mech,
 427                         OM_uint32 reqFlags,
 428                         OM_uint32 timeReq,
 429                         gss_channel_bindings_t chanBindings,
 430                         gss_buffer_t inputToken,
 431                         gss_buffer_t outputToken)
 432 {
 433     GSSEAP_NOT_IMPLEMENTED;
 434 }
 435 #endif
 436
 437 static OM_uint32
 438 eapGssSmInitGssChannelBindings(OM_uint32 *minor,
 439                                gss_cred_id_t cred,
 440                                gss_ctx_id_t ctx,
 441                                gss_name_t target,
 442                                gss_OID mech,
 443                                OM_uint32 reqFlags,
 444                                OM_uint32 timeReq,
 445                                gss_channel_bindings_t chanBindings,
 446                                gss_buffer_t inputToken,
 447                                gss_buffer_t outputToken)
 448 {
 449     OM_uint32 major, tmpMinor;
 450     gss_iov_buffer_desc iov[2];
 451     gss_buffer_desc buf;
 452
 453     iov[0].type = GSS_IOV_BUFFER_TYPE_DATA;
 454     iov[0].buffer.length = 0;
 455     iov[0].buffer.value = NULL;
 456
 457     iov[1].type = GSS_IOV_BUFFER_TYPE_HEADER | GSS_IOV_BUFFER_FLAG_ALLOCATE;
 458     iov[1].buffer.length = 0;
 459     iov[1].buffer.value = NULL;
 460
 461     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
 462         iov[0].buffer = chanBindings->application_data;
 463
 464     major = gssEapWrapOrGetMIC(minor, ctx, FALSE, FALSE, iov, 2,
 465                                TOK_TYPE_GSS_CB);
 466     if (GSS_ERROR(major))
 467         goto cleanup;
 468
 469     /* Skip past token ID */
 470     assert(iov[1].buffer.length > 2);
 471     assert(load_uint16_be(iov[1].buffer.value) == TOK_TYPE_GSS_CB);
 472
 473     buf.length = iov[1].buffer.length - 2;
 474     buf.value = (unsigned char *)iov[1].buffer.value + 2;
 475
 476     major = duplicateBuffer(minor, &buf, outputToken);
 477     if (GSS_ERROR(major))
 478         goto cleanup;
 479
 480     major = GSS_S_COMPLETE;
 481     ctx->state = EAP_STATE_ESTABLISHED;
 482
 483 cleanup:
 484     gssEapReleaseIov(iov, 2);
 485
 486     return major;
 487 }
 488
 489 static OM_uint32
 490 eapGssSmInitEstablished(OM_uint32 *minor,
 491                         gss_cred_id_t cred,
 492                         gss_ctx_id_t ctx,
 493                         gss_name_t target,
 494                         gss_OID mech,
 495                         OM_uint32 reqFlags,
 496                         OM_uint32 timeReq,
 497                         gss_channel_bindings_t chanBindings,
 498                         gss_buffer_t inputToken,
 499                         gss_buffer_t outputToken)
 500 {
 501     /* Called with already established context */
 502     *minor = EINVAL;
 503     return GSS_S_BAD_STATUS;
 504 }
 505
 506 static struct eap_gss_initiator_sm {
 507     enum gss_eap_token_type inputTokenType;
 508     enum gss_eap_token_type outputTokenType;
 509     OM_uint32 (*processToken)(OM_uint32 *,
 510                               gss_cred_id_t,
 511                               gss_ctx_id_t,
 512                               gss_name_t,
 513                               gss_OID,
 514                               OM_uint32,
 515                               OM_uint32,
 516                               gss_channel_bindings_t,
 517                               gss_buffer_t,
 518                               gss_buffer_t);
 519 } eapGssInitiatorSm[] = {
 520     { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP,  eapGssSmInitAuthenticate        },
 521 #if 0
 522     { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP,  eapGssSmInitKeyTransport        },
 523     { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP,  eapGssSmInitSecureAssoc         },
 524 #endif
 525     { TOK_TYPE_NONE,    TOK_TYPE_GSS_CB,    eapGssSmInitGssChannelBindings  },
 526     { TOK_TYPE_NONE,    TOK_TYPE_NONE,      eapGssSmInitEstablished         },
 527 };
 528
 529 OM_uint32
 530 gss_init_sec_context(OM_uint32 *minor,
 531                      gss_cred_id_t cred,
 532                      gss_ctx_id_t *context_handle,
 533                      gss_name_t target_name,
 534                      gss_OID mech_type,
 535                      OM_uint32 req_flags,
 536                      OM_uint32 time_req,
 537                      gss_channel_bindings_t input_chan_bindings,
 538                      gss_buffer_t input_token,
 539                      gss_OID *actual_mech_type,
 540                      gss_buffer_t output_token,
 541                      OM_uint32 *ret_flags,
 542                      OM_uint32 *time_rec)
 543 {
 544     OM_uint32 major;
 545     OM_uint32 tmpMajor, tmpMinor;
 546     gss_ctx_id_t ctx = *context_handle;
 547     struct eap_gss_initiator_sm *sm = NULL;
 548     gss_buffer_desc innerInputToken, innerOutputToken;
 549
 550     *minor = 0;
 551
 552     innerOutputToken.length = 0;
 553     innerOutputToken.value = NULL;
 554
 555     output_token->length = 0;
 556     output_token->value = NULL;
 557
 558     if (cred != GSS_C_NO_CREDENTIAL && !(cred->flags & CRED_FLAG_INITIATE)) {
 559         return GSS_S_NO_CRED;
 560     }
 561
 562     if (ctx == GSS_C_NO_CONTEXT) {
 563         if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
 564             return GSS_S_DEFECTIVE_TOKEN;
 565         }
 566
 567         major = gssEapAllocContext(minor, &ctx);
 568         if (GSS_ERROR(major))
 569             return major;
 570
 571         ctx->flags |= CTX_FLAG_INITIATOR;
 572
 573         *context_handle = ctx;
 574     }
 575
 576     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 577
 578     sm = &eapGssInitiatorSm[ctx->state];
 579
 580     if (input_token != GSS_C_NO_BUFFER) {
 581         major = gssEapVerifyToken(minor, ctx, input_token,
 582                                   sm->inputTokenType, &innerInputToken);
 583         if (GSS_ERROR(major))
 584             goto cleanup;
 585     } else {
 586         innerInputToken.length = 0;
 587         innerInputToken.value = NULL;
 588     }
 589
 590     /*
 591      * Advance through state machine whilst empty tokens are emitted and
 592      * the status is not GSS_S_COMPLETE or an error status.
 593      */
 594     do {
 595         sm = &eapGssInitiatorSm[ctx->state];
 596
 597         major = (sm->processToken)(minor,
 598                                    cred,
 599                                    ctx,
 600                                    target_name,
 601                                    mech_type,
 602                                    req_flags,
 603                                    time_req,
 604                                    input_chan_bindings,
 605                                    &innerInputToken,
 606                                    &innerOutputToken);
 607         if (GSS_ERROR(major))
 608             goto cleanup;
 609     } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
 610
 611     if (actual_mech_type != NULL) {
 612         if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
 613             duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
 614     }
 615     if (innerOutputToken.value != NULL) {
 616         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
 617                                    sm->outputTokenType, output_token);
 618         if (GSS_ERROR(tmpMajor)) {
 619             major = tmpMajor;
 620             *minor = tmpMinor;
 621             goto cleanup;
 622         }
 623     }
 624     if (ret_flags != NULL)
 625         *ret_flags = ctx->gssFlags;
 626     if (time_rec != NULL)
 627         gss_context_time(&tmpMinor, ctx, time_rec);
 628
 629     assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
 630
 631 cleanup:
 632     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 633
 634     if (GSS_ERROR(major))
 635         gssEapReleaseContext(&tmpMinor, context_handle);
 636
 637     gss_release_buffer(&tmpMinor, &innerOutputToken);
 638
 639     return major;
 640 }