source4/heimdal/lib/gssapi/mech/gss_krb5.c

   1 /*-
   2  * Copyright (c) 2005 Doug Rabson
   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  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  *      $FreeBSD: src/lib/libgssapi/gss_krb5.c,v 1.1 2005/12/29 14:40:20 dfr Exp $
  27  */
  28
  29 #include "mech_locl.h"
  30 RCSID("$Id: gss_krb5.c 21123 2007-06-18 20:05:26Z lha $");
  31
  32 #include <krb5.h>
  33 #include <roken.h>
  34
  35
  36 OM_uint32
  37 gss_krb5_copy_ccache(OM_uint32 *minor_status,
  38                      gss_cred_id_t cred,
  39                      krb5_ccache out)
  40 {
  41     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
  42     krb5_context context;
  43     krb5_error_code kret;
  44     krb5_ccache id;
  45     OM_uint32 ret;
  46     char *str;
  47
  48     ret = gss_inquire_cred_by_oid(minor_status,
  49                                   cred,
  50                                   GSS_KRB5_COPY_CCACHE_X,
  51                                   &data_set);
  52     if (ret)
  53         return ret;
  54
  55     if (data_set == GSS_C_NO_BUFFER_SET || data_set->count != 1) {
  56         gss_release_buffer_set(minor_status, &data_set);
  57         *minor_status = EINVAL;
  58         return GSS_S_FAILURE;
  59     }
  60
  61     kret = krb5_init_context(&context);
  62     if (kret) {
  63         *minor_status = kret;
  64         gss_release_buffer_set(minor_status, &data_set);
  65         return GSS_S_FAILURE;
  66     }
  67
  68     kret = asprintf(&str, "%.*s", (int)data_set->elements[0].length,
  69                     (char *)data_set->elements[0].value);
  70     gss_release_buffer_set(minor_status, &data_set);
  71     if (kret == -1) {
  72         *minor_status = ENOMEM;
  73         return GSS_S_FAILURE;
  74     }
  75
  76     kret = krb5_cc_resolve(context, str, &id);
  77     free(str);
  78     if (kret) {
  79         *minor_status = kret;
  80         return GSS_S_FAILURE;
  81     }
  82
  83     kret = krb5_cc_copy_cache(context, id, out);
  84     krb5_cc_close(context, id);
  85     krb5_free_context(context);
  86     if (kret) {
  87         *minor_status = kret;
  88         return GSS_S_FAILURE;
  89     }
  90
  91     return ret;
  92 }
  93
  94 OM_uint32
  95 gss_krb5_import_cred(OM_uint32 *minor_status,
  96                      krb5_ccache id,
  97                      krb5_principal keytab_principal,
  98                      krb5_keytab keytab,
  99                      gss_cred_id_t *cred)
 100 {
 101     gss_buffer_desc buffer;
 102     OM_uint32 major_status;
 103     krb5_context context;
 104     krb5_error_code ret;
 105     krb5_storage *sp;
 106     krb5_data data;
 107     char *str;
 108
 109     *cred = GSS_C_NO_CREDENTIAL;
 110
 111     ret = krb5_init_context(&context);
 112     if (ret) {
 113         *minor_status = ret;
 114         return GSS_S_FAILURE;
 115     }
 116
 117     sp = krb5_storage_emem();
 118     if (sp == NULL) {
 119         *minor_status = ENOMEM;
 120         major_status = GSS_S_FAILURE;
 121         goto out;
 122     }
 123
 124     if (id) {
 125         ret = krb5_cc_get_full_name(context, id, &str);
 126         if (ret == 0) {
 127             ret = krb5_store_string(sp, str);
 128             free(str);
 129         }
 130     } else
 131         ret = krb5_store_string(sp, "");
 132     if (ret) {
 133         *minor_status = ret;
 134         major_status = GSS_S_FAILURE;
 135         goto out;
 136     }
 137
 138     if (keytab_principal) {
 139         ret = krb5_unparse_name(context, keytab_principal, &str);
 140         if (ret == 0) {
 141             ret = krb5_store_string(sp, str);
 142             free(str);
 143         }
 144     } else
 145         krb5_store_string(sp, "");
 146     if (ret) {
 147         *minor_status = ret;
 148         major_status = GSS_S_FAILURE;
 149         goto out;
 150     }
 151
 152
 153     if (keytab) {
 154         ret = krb5_kt_get_full_name(context, keytab, &str);
 155         if (ret == 0) {
 156             ret = krb5_store_string(sp, str);
 157             free(str);
 158         }
 159     } else
 160         krb5_store_string(sp, "");
 161     if (ret) {
 162         *minor_status = ret;
 163         major_status = GSS_S_FAILURE;
 164         goto out;
 165     }
 166
 167     ret = krb5_storage_to_data(sp, &data);
 168     if (ret) {
 169         *minor_status = ret;
 170         major_status = GSS_S_FAILURE;
 171         goto out;
 172     }
 173
 174     buffer.value = data.data;
 175     buffer.length = data.length;
 176
 177     major_status = gss_set_cred_option(minor_status,
 178                                        cred,
 179                                        GSS_KRB5_IMPORT_CRED_X,
 180                                        &buffer);
 181     krb5_data_free(&data);
 182 out:
 183     if (sp)
 184         krb5_storage_free(sp);
 185     krb5_free_context(context);
 186     return major_status;
 187 }
 188
 189 OM_uint32
 190 gsskrb5_register_acceptor_identity(const char *identity)
 191 {
 192         struct _gss_mech_switch *m;
 193         gss_buffer_desc buffer;
 194         OM_uint32 junk;
 195
 196         _gss_load_mech();
 197
 198         buffer.value = rk_UNCONST(identity);
 199         buffer.length = strlen(identity);
 200
 201         SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 202                 if (m->gm_mech.gm_set_sec_context_option == NULL)
 203                         continue;
 204                 m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 205                     GSS_KRB5_REGISTER_ACCEPTOR_IDENTITY_X, &buffer);
 206         }
 207
 208         return (GSS_S_COMPLETE);
 209 }
 210
 211 OM_uint32
 212 gsskrb5_set_dns_canonicalize(int flag)
 213 {
 214         struct _gss_mech_switch *m;
 215         gss_buffer_desc buffer;
 216         OM_uint32 junk;
 217         char b = (flag != 0);
 218
 219         _gss_load_mech();
 220
 221         buffer.value = &b;
 222         buffer.length = sizeof(b);
 223
 224         SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 225                 if (m->gm_mech.gm_set_sec_context_option == NULL)
 226                         continue;
 227                 m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 228                     GSS_KRB5_SET_DNS_CANONICALIZE_X, &buffer);
 229         }
 230
 231         return (GSS_S_COMPLETE);
 232 }
 233
 234
 235
 236 static krb5_error_code
 237 set_key(krb5_keyblock *keyblock, gss_krb5_lucid_key_t *key)
 238 {
 239     key->type = keyblock->keytype;
 240     key->length = keyblock->keyvalue.length;
 241     key->data = malloc(key->length);
 242     if (key->data == NULL && key->length != 0)
 243         return ENOMEM;
 244     memcpy(key->data, keyblock->keyvalue.data, key->length);
 245     return 0;
 246 }
 247
 248 static void
 249 free_key(gss_krb5_lucid_key_t *key)
 250 {
 251     memset(key->data, 0, key->length);
 252     free(key->data);
 253     memset(key, 0, sizeof(*key));
 254 }
 255
 256
 257 OM_uint32
 258 gss_krb5_export_lucid_sec_context(OM_uint32 *minor_status,
 259                                   gss_ctx_id_t *context_handle,
 260                                   OM_uint32 version,
 261                                   void **rctx)
 262 {
 263     krb5_context context = NULL;
 264     krb5_error_code ret;
 265     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
 266     OM_uint32 major_status;
 267     gss_krb5_lucid_context_v1_t *ctx = NULL;
 268     krb5_storage *sp = NULL;
 269     uint32_t num;
 270
 271     if (context_handle == NULL
 272         || *context_handle == GSS_C_NO_CONTEXT
 273         || version != 1)
 274     {
 275         ret = EINVAL;
 276         return GSS_S_FAILURE;
 277     }
 278
 279     major_status =
 280         gss_inquire_sec_context_by_oid (minor_status,
 281                                         *context_handle,
 282                                         GSS_KRB5_EXPORT_LUCID_CONTEXT_V1_X,
 283                                         &data_set);
 284     if (major_status)
 285         return major_status;
 286
 287     if (data_set == GSS_C_NO_BUFFER_SET || data_set->count != 1) {
 288         gss_release_buffer_set(minor_status, &data_set);
 289         *minor_status = EINVAL;
 290         return GSS_S_FAILURE;
 291     }
 292
 293     ret = krb5_init_context(&context);
 294     if (ret)
 295         goto out;
 296
 297     ctx = calloc(1, sizeof(*ctx));
 298     if (ctx == NULL) {
 299         ret = ENOMEM;
 300         goto out;
 301     }
 302
 303     sp = krb5_storage_from_mem(data_set->elements[0].value,
 304                                data_set->elements[0].length);
 305     if (sp == NULL) {
 306         ret = ENOMEM;
 307         goto out;
 308     }
 309
 310     ret = krb5_ret_uint32(sp, &num);
 311     if (ret) goto out;
 312     if (num != 1) {
 313         ret = EINVAL;
 314         goto out;
 315     }
 316     ctx->version = 1;
 317     /* initiator */
 318     ret = krb5_ret_uint32(sp, &ctx->initiate);
 319     if (ret) goto out;
 320     /* endtime */
 321     ret = krb5_ret_uint32(sp, &ctx->endtime);
 322     if (ret) goto out;
 323     /* send_seq */
 324     ret = krb5_ret_uint32(sp, &num);
 325     if (ret) goto out;
 326     ctx->send_seq = ((uint64_t)num) << 32;
 327     ret = krb5_ret_uint32(sp, &num);
 328     if (ret) goto out;
 329     ctx->send_seq |= num;
 330     /* recv_seq */
 331     ret = krb5_ret_uint32(sp, &num);
 332     if (ret) goto out;
 333     ctx->recv_seq = ((uint64_t)num) << 32;
 334     ret = krb5_ret_uint32(sp, &num);
 335     if (ret) goto out;
 336     ctx->recv_seq |= num;
 337     /* protocol */
 338     ret = krb5_ret_uint32(sp, &ctx->protocol);
 339     if (ret) goto out;
 340     if (ctx->protocol == 0) {
 341         krb5_keyblock key;
 342
 343         /* sign_alg */
 344         ret = krb5_ret_uint32(sp, &ctx->rfc1964_kd.sign_alg);
 345         if (ret) goto out;
 346         /* seal_alg */
 347         ret = krb5_ret_uint32(sp, &ctx->rfc1964_kd.seal_alg);
 348         if (ret) goto out;
 349         /* ctx_key */
 350         ret = krb5_ret_keyblock(sp, &key);
 351         if (ret) goto out;
 352         ret = set_key(&key, &ctx->rfc1964_kd.ctx_key);
 353         krb5_free_keyblock_contents(context, &key);
 354         if (ret) goto out;
 355     } else if (ctx->protocol == 1) {
 356         krb5_keyblock key;
 357
 358         /* acceptor_subkey */
 359         ret = krb5_ret_uint32(sp, &ctx->cfx_kd.have_acceptor_subkey);
 360         if (ret) goto out;
 361         /* ctx_key */
 362         ret = krb5_ret_keyblock(sp, &key);
 363         if (ret) goto out;
 364         ret = set_key(&key, &ctx->cfx_kd.ctx_key);
 365         krb5_free_keyblock_contents(context, &key);
 366         if (ret) goto out;
 367         /* acceptor_subkey */
 368         if (ctx->cfx_kd.have_acceptor_subkey) {
 369             ret = krb5_ret_keyblock(sp, &key);
 370             if (ret) goto out;
 371             ret = set_key(&key, &ctx->cfx_kd.acceptor_subkey);
 372             krb5_free_keyblock_contents(context, &key);
 373             if (ret) goto out;
 374         }
 375     } else {
 376         ret = EINVAL;
 377         goto out;
 378     }
 379
 380     *rctx = ctx;
 381
 382 out:
 383     gss_release_buffer_set(minor_status, &data_set);
 384     if (sp)
 385         krb5_storage_free(sp);
 386     if (context)
 387         krb5_free_context(context);
 388
 389     if (ret) {
 390         if (ctx)
 391             gss_krb5_free_lucid_sec_context(NULL, ctx);
 392
 393         *minor_status = ret;
 394         return GSS_S_FAILURE;
 395     }
 396     *minor_status = 0;
 397     return GSS_S_COMPLETE;
 398 }
 399
 400 OM_uint32
 401 gss_krb5_free_lucid_sec_context(OM_uint32 *minor_status, void *c)
 402 {
 403     gss_krb5_lucid_context_v1_t *ctx = c;
 404
 405     if (ctx->version != 1) {
 406         if (minor_status)
 407             *minor_status = 0;
 408         return GSS_S_FAILURE;
 409     }
 410
 411     if (ctx->protocol == 0) {
 412         free_key(&ctx->rfc1964_kd.ctx_key);
 413     } else if (ctx->protocol == 1) {
 414         free_key(&ctx->cfx_kd.ctx_key);
 415         if (ctx->cfx_kd.have_acceptor_subkey)
 416             free_key(&ctx->cfx_kd.acceptor_subkey);
 417     }
 418     free(ctx);
 419     if (minor_status)
 420         *minor_status = 0;
 421     return GSS_S_COMPLETE;
 422 }
 423
 424 /*
 425  *
 426  */
 427
 428 OM_uint32
 429 gss_krb5_set_allowable_enctypes(OM_uint32 *minor_status,
 430                                 gss_cred_id_t cred,
 431                                 OM_uint32 num_enctypes,
 432                                 int32_t *enctypes)
 433 {
 434     krb5_error_code ret;
 435     OM_uint32 maj_status;
 436     gss_buffer_desc buffer;
 437     krb5_storage *sp;
 438     krb5_data data;
 439     int i;
 440
 441     sp = krb5_storage_emem();
 442     if (sp == NULL) {
 443         *minor_status = ENOMEM;
 444         maj_status = GSS_S_FAILURE;
 445         goto out;
 446     }
 447
 448     for (i = 0; i < num_enctypes; i++) {
 449         ret = krb5_store_int32(sp, enctypes[i]);
 450         if (ret) {
 451             *minor_status = ret;
 452             maj_status = GSS_S_FAILURE;
 453             goto out;
 454         }
 455     }
 456
 457     ret = krb5_storage_to_data(sp, &data);
 458     if (ret) {
 459         *minor_status = ret;
 460         maj_status = GSS_S_FAILURE;
 461         goto out;
 462     }
 463
 464     buffer.value = data.data;
 465     buffer.length = data.length;
 466
 467     maj_status = gss_set_cred_option(minor_status,
 468                                      &cred,
 469                                      GSS_KRB5_SET_ALLOWABLE_ENCTYPES_X,
 470                                      &buffer);
 471     krb5_data_free(&data);
 472 out:
 473     if (sp)
 474         krb5_storage_free(sp);
 475     return maj_status;
 476 }
 477
 478 /*
 479  *
 480  */
 481
 482 OM_uint32
 483 gsskrb5_set_send_to_kdc(struct gsskrb5_send_to_kdc *c)
 484 {
 485     struct _gss_mech_switch *m;
 486     gss_buffer_desc buffer;
 487     OM_uint32 junk;
 488
 489     _gss_load_mech();
 490
 491     if (c) {
 492         buffer.value = c;
 493         buffer.length = sizeof(*c);
 494     } else {
 495         buffer.value = NULL;
 496         buffer.length = 0;
 497     }
 498
 499     SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 500         if (m->gm_mech.gm_set_sec_context_option == NULL)
 501             continue;
 502         m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 503             GSS_KRB5_SEND_TO_KDC_X, &buffer);
 504     }
 505
 506     return (GSS_S_COMPLETE);
 507 }
 508
 509 /*
 510  *
 511  */
 512
 513 OM_uint32
 514 gss_krb5_ccache_name(OM_uint32 *minor_status,
 515                      const char *name,
 516                      const char **out_name)
 517 {
 518     struct _gss_mech_switch *m;
 519     gss_buffer_desc buffer;
 520     OM_uint32 junk;
 521
 522     _gss_load_mech();
 523
 524     if (out_name)
 525         *out_name = NULL;
 526
 527     buffer.value = rk_UNCONST(name);
 528     buffer.length = strlen(name);
 529
 530     SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 531         if (m->gm_mech.gm_set_sec_context_option == NULL)
 532             continue;
 533         m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 534             GSS_KRB5_CCACHE_NAME_X, &buffer);
 535     }
 536
 537     return (GSS_S_COMPLETE);
 538 }
 539
 540
 541 /*
 542  *
 543  */
 544
 545 OM_uint32
 546 gsskrb5_extract_authtime_from_sec_context(OM_uint32 *minor_status,
 547                                           gss_ctx_id_t context_handle,
 548                                           time_t *authtime)
 549 {
 550     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
 551     OM_uint32 maj_stat;
 552
 553     if (context_handle == GSS_C_NO_CONTEXT) {
 554         *minor_status = EINVAL;
 555         return GSS_S_FAILURE;
 556     }
 557
 558     maj_stat =
 559         gss_inquire_sec_context_by_oid (minor_status,
 560                                         context_handle,
 561                                         GSS_KRB5_GET_AUTHTIME_X,
 562                                         &data_set);
 563     if (maj_stat)
 564         return maj_stat;
 565
 566     if (data_set == GSS_C_NO_BUFFER_SET) {
 567         gss_release_buffer_set(minor_status, &data_set);
 568         *minor_status = EINVAL;
 569         return GSS_S_FAILURE;
 570     }
 571
 572     if (data_set->count != 1) {
 573         gss_release_buffer_set(minor_status, &data_set);
 574         *minor_status = EINVAL;
 575         return GSS_S_FAILURE;
 576     }
 577
 578     if (data_set->elements[0].length != 4) {
 579         gss_release_buffer_set(minor_status, &data_set);
 580         *minor_status = EINVAL;
 581         return GSS_S_FAILURE;
 582     }
 583
 584     {
 585         unsigned char *buf = data_set->elements[0].value;
 586         *authtime = (buf[3] <<24) | (buf[2] << 16) |
 587             (buf[1] << 8) | (buf[0] << 0);
 588     }
 589
 590     gss_release_buffer_set(minor_status, &data_set);
 591
 592     *minor_status = 0;
 593     return GSS_S_COMPLETE;
 594 }
 595
 596 /*
 597  *
 598  */
 599
 600 OM_uint32
 601 gsskrb5_extract_authz_data_from_sec_context(OM_uint32 *minor_status,
 602                                             gss_ctx_id_t context_handle,
 603                                             int ad_type,
 604                                             gss_buffer_t ad_data)
 605 {
 606     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
 607     OM_uint32 maj_stat;
 608     gss_OID_desc oid_flat;
 609     heim_oid baseoid, oid;
 610     size_t size;
 611
 612     if (context_handle == GSS_C_NO_CONTEXT) {
 613         *minor_status = EINVAL;
 614         return GSS_S_FAILURE;
 615     }
 616
 617     /* All this to append an integer to an oid... */
 618
 619     if (der_get_oid(GSS_KRB5_EXTRACT_AUTHZ_DATA_FROM_SEC_CONTEXT_X->elements,
 620                     GSS_KRB5_EXTRACT_AUTHZ_DATA_FROM_SEC_CONTEXT_X->length,
 621                     &baseoid, NULL) != 0) {
 622         *minor_status = EINVAL;
 623         return GSS_S_FAILURE;
 624     }
 625
 626     oid.length = baseoid.length + 1;
 627     oid.components = calloc(oid.length, sizeof(*oid.components));
 628     if (oid.components == NULL) {
 629         der_free_oid(&baseoid);
 630
 631         *minor_status = ENOMEM;
 632         return GSS_S_FAILURE;
 633     }
 634
 635     memcpy(oid.components, baseoid.components,
 636            baseoid.length * sizeof(*baseoid.components));
 637
 638     der_free_oid(&baseoid);
 639
 640     oid.components[oid.length - 1] = ad_type;
 641
 642     oid_flat.length = der_length_oid(&oid);
 643     oid_flat.elements = malloc(oid_flat.length);
 644     if (oid_flat.elements == NULL) {
 645         free(oid.components);
 646         *minor_status = ENOMEM;
 647         return GSS_S_FAILURE;
 648     }
 649
 650     if (der_put_oid((unsigned char *)oid_flat.elements + oid_flat.length - 1,
 651                     oid_flat.length, &oid, &size) != 0) {
 652         free(oid.components);
 653         free(oid_flat.elements);
 654         *minor_status = EINVAL;
 655         return GSS_S_FAILURE;
 656     }
 657     if (oid_flat.length != size)
 658         abort();
 659
 660     free(oid.components);
 661
 662     /* FINALLY, we have the OID */
 663
 664     maj_stat = gss_inquire_sec_context_by_oid (minor_status,
 665                                                context_handle,
 666                                                &oid_flat,
 667                                                &data_set);
 668
 669     free(oid_flat.elements);
 670
 671     if (maj_stat)
 672         return maj_stat;
 673
 674     if (data_set == GSS_C_NO_BUFFER_SET || data_set->count != 1) {
 675         gss_release_buffer_set(minor_status, &data_set);
 676         *minor_status = EINVAL;
 677         return GSS_S_FAILURE;
 678     }
 679
 680     ad_data->value = malloc(data_set->elements[0].length);
 681     if (ad_data->value == NULL) {
 682         gss_release_buffer_set(minor_status, &data_set);
 683         *minor_status = ENOMEM;
 684         return GSS_S_FAILURE;
 685     }
 686
 687     ad_data->length = data_set->elements[0].length;
 688     memcpy(ad_data->value, data_set->elements[0].value, ad_data->length);
 689     gss_release_buffer_set(minor_status, &data_set);
 690
 691     *minor_status = 0;
 692     return GSS_S_COMPLETE;
 693 }
 694
 695 /*
 696  *
 697  */
 698
 699 static OM_uint32
 700 gsskrb5_extract_key(OM_uint32 *minor_status,
 701                     gss_ctx_id_t context_handle,
 702                     const gss_OID oid,
 703                     krb5_keyblock **keyblock)
 704 {
 705     krb5_error_code ret;
 706     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
 707     OM_uint32 major_status;
 708     krb5_context context = NULL;
 709     krb5_storage *sp = NULL;
 710
 711     if (context_handle == GSS_C_NO_CONTEXT) {
 712         ret = EINVAL;
 713         return GSS_S_FAILURE;
 714     }
 715
 716     ret = krb5_init_context(&context);
 717     if(ret) {
 718         *minor_status = ret;
 719         return GSS_S_FAILURE;
 720     }
 721
 722     major_status =
 723         gss_inquire_sec_context_by_oid (minor_status,
 724                                         context_handle,
 725                                         oid,
 726                                         &data_set);
 727     if (major_status)
 728         return major_status;
 729
 730     if (data_set == GSS_C_NO_BUFFER_SET || data_set->count != 1) {
 731         gss_release_buffer_set(minor_status, &data_set);
 732         *minor_status = EINVAL;
 733         return GSS_S_FAILURE;
 734     }
 735
 736     sp = krb5_storage_from_mem(data_set->elements[0].value,
 737                                data_set->elements[0].length);
 738     if (sp == NULL) {
 739         ret = ENOMEM;
 740         goto out;
 741     }
 742
 743     *keyblock = calloc(1, sizeof(**keyblock));
 744     if (keyblock == NULL) {
 745         ret = ENOMEM;
 746         goto out;
 747     }
 748
 749     ret = krb5_ret_keyblock(sp, *keyblock);
 750
 751 out:
 752     gss_release_buffer_set(minor_status, &data_set);
 753     if (sp)
 754         krb5_storage_free(sp);
 755     if (ret && keyblock) {
 756         krb5_free_keyblock(context, *keyblock);
 757         *keyblock = NULL;
 758     }
 759     if (context)
 760         krb5_free_context(context);
 761
 762     *minor_status = ret;
 763     if (ret)
 764         return GSS_S_FAILURE;
 765
 766     return GSS_S_COMPLETE;
 767 }
 768
 769 /*
 770  *
 771  */
 772
 773 OM_uint32
 774 gsskrb5_extract_service_keyblock(OM_uint32 *minor_status,
 775                                  gss_ctx_id_t context_handle,
 776                                  krb5_keyblock **keyblock)
 777 {
 778     return gsskrb5_extract_key(minor_status,
 779                                context_handle,
 780                                GSS_KRB5_GET_SERVICE_KEYBLOCK_X,
 781                                keyblock);
 782 }
 783
 784 OM_uint32
 785 gsskrb5_get_initiator_subkey(OM_uint32 *minor_status,
 786                              gss_ctx_id_t context_handle,
 787                              krb5_keyblock **keyblock)
 788 {
 789     return gsskrb5_extract_key(minor_status,
 790                                context_handle,
 791                                GSS_KRB5_GET_INITIATOR_SUBKEY_X,
 792                                keyblock);
 793 }
 794
 795 OM_uint32
 796 gsskrb5_get_subkey(OM_uint32 *minor_status,
 797                    gss_ctx_id_t context_handle,
 798                    krb5_keyblock **keyblock)
 799 {
 800     return gsskrb5_extract_key(minor_status,
 801                                context_handle,
 802                                GSS_KRB5_GET_SUBKEY_X,
 803                                keyblock);
 804 }
 805
 806 OM_uint32
 807 gsskrb5_set_default_realm(const char *realm)
 808 {
 809         struct _gss_mech_switch *m;
 810         gss_buffer_desc buffer;
 811         OM_uint32 junk;
 812
 813         _gss_load_mech();
 814
 815         buffer.value = rk_UNCONST(realm);
 816         buffer.length = strlen(realm);
 817
 818         SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 819                 if (m->gm_mech.gm_set_sec_context_option == NULL)
 820                         continue;
 821                 m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 822                     GSS_KRB5_SET_DEFAULT_REALM_X, &buffer);
 823         }
 824
 825         return (GSS_S_COMPLETE);
 826 }