util_reauth.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 #include <dlfcn.h>
  36
  37 /*
  38  * Fast reauthentication support for EAP GSS.
  39  */
  40
  41 krb5_error_code
  42 krb5_encrypt_tkt_part(krb5_context, const krb5_keyblock *, krb5_ticket *);
  43
  44 krb5_error_code
  45 encode_krb5_ticket(const krb5_ticket *rep, krb5_data **code);
  46
  47 static krb5_error_code
  48 getAcceptorKey(krb5_context krbContext,
  49                gss_ctx_id_t ctx,
  50                gss_cred_id_t cred,
  51                krb5_principal *princ,
  52                krb5_keyblock *key)
  53 {
  54     krb5_error_code code;
  55     krb5_keytab keytab = NULL;
  56     krb5_keytab_entry ktent;
  57     krb5_kt_cursor cursor = NULL;
  58
  59     *princ = NULL;
  60     memset(key, 0, sizeof(*key));
  61     memset(&ktent, 0, sizeof(ktent));
  62
  63     code = krb5_kt_default(krbContext, &keytab);
  64     if (code != 0)
  65         goto cleanup;
  66
  67     if (cred != GSS_C_NO_CREDENTIAL && cred->name != GSS_C_NO_NAME) {
  68         code = krb5_kt_get_entry(krbContext, keytab,
  69                                  cred->name->krbPrincipal, 0,
  70                                  ctx->encryptionType, &ktent);
  71         if (code != 0)
  72             goto cleanup;
  73     } else {
  74         code = krb5_kt_start_seq_get(krbContext, keytab, &cursor);
  75         if (code != 0)
  76             goto cleanup;
  77
  78         while ((code = krb5_kt_next_entry(krbContext, keytab,
  79                                           &ktent, &cursor)) == 0) {
  80             if (ktent.key.enctype == ctx->encryptionType) {
  81                 break;
  82             } else {
  83                 krb5_free_keytab_entry_contents(krbContext, &ktent);
  84             }
  85         }
  86     }
  87
  88     if (code == 0) {
  89         *princ = ktent.principal;
  90         *key = ktent.key;
  91     }
  92
  93 cleanup:
  94     if (cred == GSS_C_NO_CREDENTIAL || cred->name == GSS_C_NO_NAME)
  95         krb5_kt_end_seq_get(krbContext, keytab, &cursor);
  96     krb5_kt_close(krbContext, keytab);
  97
  98     if (code != 0) {
  99         if (*princ != NULL) {
 100             krb5_free_principal(krbContext, *princ);
 101             *princ = NULL;
 102         }
 103         krb5_free_keyblock_contents(krbContext, key),
 104         memset(key, 0, sizeof(key));
 105     }
 106
 107     return code;
 108 }
 109
 110 OM_uint32
 111 gssEapMakeReauthCreds(OM_uint32 *minor,
 112                       gss_ctx_id_t ctx,
 113                       gss_cred_id_t cred,
 114                       gss_buffer_t credBuf)
 115 {
 116     OM_uint32 major = GSS_S_COMPLETE;
 117     krb5_error_code code;
 118     krb5_context krbContext = NULL;
 119     krb5_ticket ticket = { 0 };
 120     krb5_keyblock session, acceptorKey = { 0 };
 121     krb5_enc_tkt_part enc_part = { 0 };
 122     gss_buffer_desc attrBuf = GSS_C_EMPTY_BUFFER;
 123     krb5_authdata *authData[2], authDatum = { 0 };
 124     krb5_data *ticketData = NULL, *credsData = NULL;
 125     krb5_creds creds = { 0 };
 126     krb5_auth_context authContext = NULL;
 127
 128     credBuf->length = 0;
 129     credBuf->value = NULL;
 130
 131     GSSEAP_KRB_INIT(&krbContext);
 132
 133     code = getAcceptorKey(krbContext, ctx, cred,
 134                           &ticket.server, &acceptorKey);
 135     if (code == KRB5_KT_NOTFOUND) {
 136         gss_buffer_desc emptyToken = { 0, "" };
 137
 138         /*
 139          * If we can't produce the KRB-CRED message, we need to
 140          * return an empty (not NULL) token to the caller so we
 141          * don't change the number of authentication legs.
 142          */
 143         return duplicateBuffer(minor, &emptyToken, credBuf);
 144     } else if (code != 0)
 145         goto cleanup;
 146
 147     enc_part.flags = TKT_FLG_INITIAL;
 148
 149     code = krb5_c_make_random_key(krbContext, ctx->encryptionType,
 150                                   &session);
 151     if (code != 0)
 152         goto cleanup;
 153
 154     enc_part.session = &session;
 155     enc_part.client = ctx->initiatorName->krbPrincipal;
 156     enc_part.times.authtime = time(NULL);
 157     enc_part.times.starttime = enc_part.times.authtime;
 158     enc_part.times.endtime = ctx->expiryTime
 159                              ? ctx->expiryTime
 160                              : KRB5_INT32_MAX;
 161     enc_part.times.renew_till = 0;
 162
 163     major = gssEapExportAttrContext(minor, ctx->initiatorName,
 164                                     &attrBuf);
 165     if (GSS_ERROR(major))
 166         goto cleanup;
 167
 168     authDatum.ad_type = KRB5_AUTHDATA_RADIUS_AVP;
 169     authDatum.length = attrBuf.length;
 170     authDatum.contents = attrBuf.value;
 171     authData[0] = &authDatum;
 172     authData[1] = NULL;
 173     enc_part.authorization_data = authData;
 174
 175     ticket.enc_part2 = &enc_part;
 176
 177     code = krb5_encrypt_tkt_part(krbContext, &acceptorKey, &ticket);
 178     if (code != 0)
 179         goto cleanup;
 180
 181     code = encode_krb5_ticket(&ticket, &ticketData);
 182     if (code != 0)
 183         goto cleanup;
 184
 185     creds.client = enc_part.client;
 186     creds.server = ticket.server;
 187     creds.keyblock = session;
 188     creds.times = enc_part.times;
 189     creds.ticket_flags = enc_part.flags;
 190     creds.ticket = *ticketData;
 191     creds.authdata = authData;
 192
 193     code = krb5_auth_con_init(krbContext, &authContext);
 194     if (code != 0)
 195         goto cleanup;
 196
 197     code = krb5_auth_con_setflags(krbContext, authContext, 0);
 198     if (code != 0)
 199         goto cleanup;
 200
 201     code = krb5_auth_con_setsendsubkey(krbContext, authContext, &ctx->rfc3961Key);
 202     if (code != 0)
 203         goto cleanup;
 204
 205     code = krb5_mk_1cred(krbContext, authContext, &creds, &credsData, NULL);
 206     if (code != 0)
 207         goto cleanup;
 208
 209     krbDataToGssBuffer(credsData, credBuf);
 210
 211 cleanup:
 212     if (ticket.enc_part.ciphertext.data != NULL)
 213         GSSEAP_FREE(ticket.enc_part.ciphertext.data);
 214     krb5_free_keyblock_contents(krbContext, &session);
 215     krb5_free_keyblock_contents(krbContext, &acceptorKey);
 216     gss_release_buffer(minor, &attrBuf);
 217     krb5_free_data(krbContext, ticketData);
 218     krb5_auth_con_free(krbContext, authContext);
 219     if (credsData != NULL)
 220         GSSEAP_FREE(credsData);
 221
 222     if (major == GSS_S_COMPLETE) {
 223         *minor = code;
 224         major = code != 0 ? GSS_S_FAILURE : GSS_S_COMPLETE;
 225     }
 226
 227     return major;
 228 }
 229
 230 static int
 231 isTicketGrantingServiceP(krb5_context krbContext,
 232                          krb5_const_principal principal)
 233 {
 234     if (krb5_princ_size(krbContext, principal) == 2 &&
 235         krb5_princ_component(krbContext, principal, 0)->length == 6 &&
 236         memcmp(krb5_princ_component(krbContext, principal, 0)->data, "krbtgt", 6) == 0)
 237         return TRUE;
 238
 239     return FALSE;
 240 }
 241
 242 OM_uint32
 243 gssEapStoreReauthCreds(OM_uint32 *minor,
 244                        gss_ctx_id_t ctx,
 245                        gss_cred_id_t cred,
 246                        gss_buffer_t credBuf)
 247 {
 248     OM_uint32 major = GSS_S_COMPLETE, code;
 249     krb5_context krbContext = NULL;
 250     krb5_auth_context authContext = NULL;
 251     krb5_data credData = { 0 };
 252     krb5_creds **creds = NULL;
 253     krb5_principal canonPrinc;
 254     int i;
 255
 256     if (credBuf->length == 0 || cred == GSS_C_NO_CREDENTIAL)
 257         return GSS_S_COMPLETE;
 258
 259     GSSEAP_KRB_INIT(&krbContext);
 260
 261     code = krb5_auth_con_init(krbContext, &authContext);
 262     if (code != 0)
 263         goto cleanup;
 264
 265     code = krb5_auth_con_setflags(krbContext, authContext, 0);
 266     if (code != 0)
 267         goto cleanup;
 268
 269     code = krb5_auth_con_setrecvsubkey(krbContext, authContext,
 270                                        &ctx->rfc3961Key);
 271     if (code != 0)
 272         goto cleanup;
 273
 274     gssBufferToKrbData(credBuf, &credData);
 275
 276     code = krb5_rd_cred(krbContext, authContext, &credData, &creds, NULL);
 277     if (code != 0)
 278         goto cleanup;
 279
 280     if (creds == NULL || creds[0] == NULL)
 281         goto cleanup;
 282
 283     code = krb5_copy_principal(krbContext, creds[0]->client, &canonPrinc);
 284     if (code != 0)
 285         goto cleanup;
 286
 287     krb5_free_principal(krbContext, cred->name->krbPrincipal);
 288     cred->name->krbPrincipal = canonPrinc;
 289
 290     cred->expiryTime = creds[0]->times.endtime;
 291
 292     code = krb5_cc_new_unique(krbContext, "MEMORY", NULL, &cred->krbCredCache);
 293     if (code != 0)
 294         goto cleanup;
 295
 296     code = krb5_cc_initialize(krbContext, cred->krbCredCache, creds[0]->client);
 297     if (code != 0)
 298         goto cleanup;
 299
 300     for (i = 0; creds[i] != NULL; i++) {
 301         krb5_creds kcred = *(creds[i]);
 302
 303         /* Swap in the acceptor name the client asked for so get_credentials() works */
 304         if (!isTicketGrantingServiceP(krbContext, kcred.server))
 305             kcred.server = ctx->acceptorName->krbPrincipal;
 306
 307         code = krb5_cc_store_cred(krbContext, cred->krbCredCache, &kcred);
 308         if (code != 0)
 309             goto cleanup;
 310     }
 311
 312     major = gss_krb5_import_cred(minor, cred->krbCredCache, NULL, NULL,
 313                                  &cred->krbCred);
 314     if (GSS_ERROR(major))
 315         goto cleanup;
 316
 317 cleanup:
 318     *minor = code;
 319
 320     krb5_auth_con_free(krbContext, authContext);
 321     if (creds != NULL) {
 322         for (i = 0; creds[i] != NULL; i++)
 323             krb5_free_creds(krbContext, creds[i]);
 324     }
 325     if (major == GSS_S_COMPLETE)
 326         major = *minor ? GSS_S_FAILURE : GSS_S_COMPLETE;
 327
 328     return major;
 329 }
 330
 331 static OM_uint32 (*gssInitSecContextNext)(
 332     OM_uint32 *minor,
 333     gss_cred_id_t cred,
 334     gss_ctx_id_t *context_handle,
 335     gss_name_t target_name,
 336     gss_OID mech_type,
 337     OM_uint32 req_flags,
 338     OM_uint32 time_req,
 339     gss_channel_bindings_t input_chan_bindings,
 340     gss_buffer_t input_token,
 341     gss_OID *actual_mech_type,
 342     gss_buffer_t output_token,
 343     OM_uint32 *ret_flags,
 344     OM_uint32 *time_rec);
 345
 346 static OM_uint32 (*gssAcceptSecContextNext)(
 347     OM_uint32 *minor,
 348     gss_ctx_id_t *context_handle,
 349     gss_cred_id_t cred,
 350     gss_buffer_t input_token,
 351     gss_channel_bindings_t input_chan_bindings,
 352     gss_name_t *src_name,
 353     gss_OID *mech_type,
 354     gss_buffer_t output_token,
 355     OM_uint32 *ret_flags,
 356     OM_uint32 *time_rec,
 357     gss_cred_id_t *delegated_cred_handle);
 358
 359 static OM_uint32 (*gssReleaseCredNext)(
 360     OM_uint32 *minor,
 361     gss_cred_id_t *cred_handle);
 362
 363 static OM_uint32 (*gssReleaseNameNext)(
 364     OM_uint32 *minor,
 365     gss_name_t *name);
 366
 367 static OM_uint32 (*gssInquireSecContextByOidNext)(
 368     OM_uint32 *minor,
 369     const gss_ctx_id_t context_handle,
 370     const gss_OID desired_object,
 371     gss_buffer_set_t *data_set);
 372
 373 static OM_uint32 (*gssDeleteSecContextNext)(
 374     OM_uint32 *minor,
 375     gss_ctx_id_t *context_handle,
 376     gss_buffer_t output_token);
 377
 378 static OM_uint32 (*gssDisplayNameNext)(
 379     OM_uint32 *minor,
 380     gss_name_t name,
 381     gss_buffer_t output_name_buffer,
 382     gss_OID *output_name_type);
 383
 384 static OM_uint32 (*gssImportNameNext)(
 385     OM_uint32 *minor,
 386     gss_buffer_t buffer,
 387     gss_OID nameType,
 388     gss_name_t *outputName);
 389
 390 static OM_uint32 (*gssKrbExtractAuthzDataFromSecContextNext)(
 391     OM_uint32 *minor,
 392     const gss_ctx_id_t context_handle,
 393     int ad_type,
 394     gss_buffer_t ad_data);
 395
 396 OM_uint32
 397 gssEapReauthInitialize(OM_uint32 *minor)
 398 {
 399     gssInitSecContextNext = dlsym(RTLD_NEXT, "gss_init_sec_context");
 400     gssAcceptSecContextNext = dlsym(RTLD_NEXT, "gss_accept_sec_context");
 401     gssReleaseCredNext = dlsym(RTLD_NEXT, "gss_release_cred");
 402     gssReleaseNameNext = dlsym(RTLD_NEXT, "gss_release_name");
 403     gssInquireSecContextByOidNext = dlsym(RTLD_NEXT, "gss_inquire_sec_context_by_oid");
 404     gssDeleteSecContextNext = dlsym(RTLD_NEXT, "gss_delete_sec_context");
 405     gssDisplayNameNext = dlsym(RTLD_NEXT, "gss_display_name");
 406     gssImportNameNext = dlsym(RTLD_NEXT, "gss_import_name");
 407     gssKrbExtractAuthzDataFromSecContextNext = dlsym(RTLD_NEXT, "gsskrb5_extract_authz_data_from_sec_context");
 408
 409     return GSS_S_COMPLETE;
 410 }
 411
 412 OM_uint32
 413 gssInitSecContext(OM_uint32 *minor,
 414                   gss_cred_id_t cred,
 415                   gss_ctx_id_t *context_handle,
 416                   gss_name_t target_name,
 417                   gss_OID mech_type,
 418                   OM_uint32 req_flags,
 419                   OM_uint32 time_req,
 420                   gss_channel_bindings_t input_chan_bindings,
 421                   gss_buffer_t input_token,
 422                   gss_OID *actual_mech_type,
 423                   gss_buffer_t output_token,
 424                   OM_uint32 *ret_flags,
 425                   OM_uint32 *time_rec)
 426 {
 427     if (gssInitSecContextNext == NULL)
 428         return GSS_S_UNAVAILABLE;
 429
 430     return gssInitSecContextNext(minor, cred, context_handle,
 431                                  target_name, mech_type, req_flags,
 432                                  time_req, input_chan_bindings,
 433                                  input_token, actual_mech_type,
 434                                  output_token, ret_flags, time_rec);
 435 }
 436
 437 OM_uint32
 438 gssAcceptSecContext(OM_uint32 *minor,
 439                     gss_ctx_id_t *context_handle,
 440                     gss_cred_id_t cred,
 441                     gss_buffer_t input_token,
 442                     gss_channel_bindings_t input_chan_bindings,
 443                     gss_name_t *src_name,
 444                     gss_OID *mech_type,
 445                     gss_buffer_t output_token,
 446                     OM_uint32 *ret_flags,
 447                     OM_uint32 *time_rec,
 448                     gss_cred_id_t *delegated_cred_handle)
 449 {
 450     if (gssAcceptSecContextNext == NULL)
 451         return GSS_S_UNAVAILABLE;
 452
 453     return gssAcceptSecContextNext(minor, context_handle, cred,
 454                                    input_token, input_chan_bindings,
 455                                    src_name, mech_type, output_token,
 456                                    ret_flags, time_rec, delegated_cred_handle);
 457 }
 458
 459 OM_uint32
 460 gssReleaseCred(OM_uint32 *minor,
 461                gss_cred_id_t *cred_handle)
 462 {
 463     if (gssReleaseCredNext == NULL)
 464         return GSS_S_UNAVAILABLE;
 465
 466     return gssReleaseCredNext(minor, cred_handle);
 467 }
 468
 469 OM_uint32
 470 gssReleaseName(OM_uint32 *minor,
 471                gss_name_t *name)
 472 {
 473     if (gssReleaseName == NULL)
 474         return GSS_S_UNAVAILABLE;
 475
 476     return gssReleaseNameNext(minor, name);
 477 }
 478
 479 OM_uint32
 480 gssDeleteSecContext(OM_uint32 *minor,
 481                     gss_ctx_id_t *context_handle,
 482                     gss_buffer_t output_token)
 483 {
 484     if (gssDeleteSecContextNext == NULL)
 485         return GSS_S_UNAVAILABLE;
 486
 487     return gssDeleteSecContextNext(minor, context_handle, output_token);
 488 }
 489
 490 static OM_uint32
 491 gssDisplayName(OM_uint32 *minor,
 492                gss_name_t name,
 493                gss_buffer_t buffer,
 494                gss_OID *name_type)
 495 {
 496     if (gssDisplayNameNext == NULL)
 497         return GSS_S_UNAVAILABLE;
 498
 499     return gssDisplayNameNext(minor, name, buffer, name_type);
 500 }
 501
 502 static OM_uint32
 503 gssImportName(OM_uint32 *minor,
 504               gss_buffer_t buffer,
 505               gss_OID name_type,
 506               gss_name_t *name)
 507 {
 508     if (gssImportNameNext == NULL)
 509         return GSS_S_UNAVAILABLE;
 510
 511     return gssImportNameNext(minor, buffer, name_type, name);
 512 }
 513
 514 OM_uint32
 515 gssInquireSecContextByOid(OM_uint32 *minor,
 516                           const gss_ctx_id_t context_handle,
 517                           const gss_OID desired_object,
 518                           gss_buffer_set_t *data_set)
 519 {
 520     if (gssInquireSecContextByOidNext == NULL)
 521         return GSS_S_UNAVAILABLE;
 522
 523     return gssInquireSecContextByOidNext(minor, context_handle,
 524                                          desired_object, data_set);
 525 }
 526
 527 OM_uint32
 528 gssKrbExtractAuthzDataFromSecContext(OM_uint32 *minor,
 529                                      const gss_ctx_id_t ctx,
 530                                      int ad_type,
 531                                      gss_buffer_t ad_data)
 532 {
 533     if (gssKrbExtractAuthzDataFromSecContextNext == NULL)
 534         return GSS_S_UNAVAILABLE;
 535
 536     return gssKrbExtractAuthzDataFromSecContextNext(minor, ctx, ad_type, ad_data);
 537 }
 538
 539 OM_uint32
 540 gssEapGlueToMechName(OM_uint32 *minor,
 541                      gss_name_t glueName,
 542                      gss_name_t *pMechName)
 543 {
 544     OM_uint32 major, tmpMinor;
 545     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
 546
 547     *pMechName = GSS_C_NO_NAME;
 548
 549     major = gssDisplayName(minor, glueName, &nameBuf, NULL);
 550     if (GSS_ERROR(major))
 551         goto cleanup;
 552
 553     major = gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 554                              pMechName);
 555     if (GSS_ERROR(major))
 556         goto cleanup;
 557
 558 cleanup:
 559     gss_release_buffer(&tmpMinor, &nameBuf);
 560
 561     return major;
 562 }
 563
 564 OM_uint32
 565 gssEapMechToGlueName(OM_uint32 *minor,
 566                      gss_name_t mechName,
 567                      gss_name_t *pGlueName)
 568 {
 569     OM_uint32 major, tmpMinor;
 570     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
 571
 572     *pGlueName = GSS_C_NO_NAME;
 573
 574     major = gssEapDisplayName(minor, mechName, &nameBuf, NULL);
 575     if (GSS_ERROR(major))
 576         goto cleanup;
 577
 578     major = gssImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
 579                           pGlueName);
 580     if (GSS_ERROR(major))
 581         goto cleanup;
 582
 583 cleanup:
 584     gss_release_buffer(&tmpMinor, &nameBuf);
 585
 586     return major;
 587 }
 588
 589 OM_uint32
 590 gssEapReauthComplete(OM_uint32 *minor,
 591                     gss_ctx_id_t ctx,
 592                     gss_cred_id_t cred,
 593                     const gss_OID mech,
 594                     OM_uint32 timeRec)
 595 {
 596     OM_uint32 major, tmpMinor;
 597     gss_buffer_set_t keyData = GSS_C_NO_BUFFER_SET;
 598
 599     if (!oidEqual(mech, gss_mech_krb5)) {
 600         major = GSS_S_BAD_MECH;
 601         goto cleanup;
 602     }
 603
 604     major = gssInquireSecContextByOid(minor, ctx->kerberosCtx,
 605                                       GSS_C_INQ_SSPI_SESSION_KEY, &keyData);
 606     if (GSS_ERROR(major))
 607         goto cleanup;
 608
 609     {
 610         gss_OID_desc oid;
 611         int suffix;
 612
 613         oid.length = keyData->elements[1].length;
 614         oid.elements = keyData->elements[1].value;
 615
 616         /* GSS_KRB5_SESSION_KEY_ENCTYPE_OID */
 617         major = decomposeOid(minor,
 618                              "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x04",
 619                              10, &oid, &suffix);
 620         if (GSS_ERROR(major))
 621             goto cleanup;
 622
 623         ctx->encryptionType = suffix;
 624     }
 625
 626     {
 627         krb5_context krbContext = NULL;
 628         krb5_keyblock key;
 629
 630         GSSEAP_KRB_INIT(&krbContext);
 631
 632         KRB_KEY_LENGTH(&key) = keyData->elements[0].length;
 633         KRB_KEY_DATA(&key)   = keyData->elements[0].value;
 634         KRB_KEY_TYPE(&key)   = ctx->encryptionType;
 635
 636         *minor = krb5_copy_keyblock_contents(krbContext,
 637                                              &key, &ctx->rfc3961Key);
 638         if (*minor != 0) {
 639             major = GSS_S_FAILURE;
 640             goto cleanup;
 641         }
 642     }
 643
 644     major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
 645                                       &ctx->checksumType);
 646     if (GSS_ERROR(major))
 647         goto cleanup;
 648
 649     if (timeRec != GSS_C_INDEFINITE)
 650         ctx->expiryTime = time(NULL) + timeRec;
 651
 652     major = sequenceInit(minor,
 653                          &ctx->seqState, ctx->recvSeq,
 654                          ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
 655                          ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
 656                          TRUE);
 657     if (GSS_ERROR(major))
 658         goto cleanup;
 659
 660     major = GSS_S_COMPLETE;
 661
 662 cleanup:
 663     gss_release_buffer_set(&tmpMinor, &keyData);
 664
 665     return major;
 666 }