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
  31 #include <krb5.h>
  32 #include <roken.h>
  33
  34
  35 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
  36 gss_krb5_copy_ccache(OM_uint32 *minor_status,
  37                      gss_cred_id_t cred,
  38                      krb5_ccache out)
  39 {
  40     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
  41     krb5_context context;
  42     krb5_error_code kret;
  43     krb5_ccache id;
  44     OM_uint32 ret;
  45     char *str = NULL;
  46
  47     ret = gss_inquire_cred_by_oid(minor_status,
  48                                   cred,
  49                                   GSS_KRB5_COPY_CCACHE_X,
  50                                   &data_set);
  51     if (ret)
  52         return ret;
  53
  54     if (data_set == GSS_C_NO_BUFFER_SET || data_set->count < 1) {
  55         gss_release_buffer_set(minor_status, &data_set);
  56         *minor_status = EINVAL;
  57         return GSS_S_FAILURE;
  58     }
  59
  60     kret = krb5_init_context(&context);
  61     if (kret) {
  62         *minor_status = kret;
  63         gss_release_buffer_set(minor_status, &data_set);
  64         return GSS_S_FAILURE;
  65     }
  66
  67     kret = asprintf(&str, "%.*s", (int)data_set->elements[0].length,
  68                     (char *)data_set->elements[0].value);
  69     gss_release_buffer_set(minor_status, &data_set);
  70     if (kret < 0 || str == NULL) {
  71         *minor_status = ENOMEM;
  72         return GSS_S_FAILURE;
  73     }
  74
  75     kret = krb5_cc_resolve(context, str, &id);
  76     free(str);
  77     if (kret) {
  78         *minor_status = kret;
  79         return GSS_S_FAILURE;
  80     }
  81
  82     kret = krb5_cc_copy_cache(context, id, out);
  83     krb5_cc_close(context, id);
  84     krb5_free_context(context);
  85     if (kret) {
  86         *minor_status = kret;
  87         return GSS_S_FAILURE;
  88     }
  89
  90     return ret;
  91 }
  92
  93 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
  94 gss_krb5_import_cred(OM_uint32 *minor_status,
  95                      krb5_ccache id,
  96                      krb5_principal keytab_principal,
  97                      krb5_keytab keytab,
  98                      gss_cred_id_t *cred)
  99 {
 100     gss_buffer_desc buffer;
 101     OM_uint32 major_status;
 102     krb5_context context;
 103     krb5_error_code ret;
 104     krb5_storage *sp;
 105     krb5_data data;
 106     char *str;
 107
 108     *cred = GSS_C_NO_CREDENTIAL;
 109
 110     ret = krb5_init_context(&context);
 111     if (ret) {
 112         *minor_status = ret;
 113         return GSS_S_FAILURE;
 114     }
 115
 116     sp = krb5_storage_emem();
 117     if (sp == NULL) {
 118         *minor_status = ENOMEM;
 119         major_status = GSS_S_FAILURE;
 120         goto out;
 121     }
 122
 123     if (id) {
 124         ret = krb5_cc_get_full_name(context, id, &str);
 125         if (ret == 0) {
 126             ret = krb5_store_string(sp, str);
 127             free(str);
 128         }
 129     } else
 130         ret = krb5_store_string(sp, "");
 131     if (ret) {
 132         *minor_status = ret;
 133         major_status = GSS_S_FAILURE;
 134         goto out;
 135     }
 136
 137     if (keytab_principal) {
 138         ret = krb5_unparse_name(context, keytab_principal, &str);
 139         if (ret == 0) {
 140             ret = krb5_store_string(sp, str);
 141             free(str);
 142         }
 143     } else
 144         krb5_store_string(sp, "");
 145     if (ret) {
 146         *minor_status = ret;
 147         major_status = GSS_S_FAILURE;
 148         goto out;
 149     }
 150
 151
 152     if (keytab) {
 153         ret = krb5_kt_get_full_name(context, keytab, &str);
 154         if (ret == 0) {
 155             ret = krb5_store_string(sp, str);
 156             free(str);
 157         }
 158     } else
 159         krb5_store_string(sp, "");
 160     if (ret) {
 161         *minor_status = ret;
 162         major_status = GSS_S_FAILURE;
 163         goto out;
 164     }
 165
 166     ret = krb5_storage_to_data(sp, &data);
 167     if (ret) {
 168         *minor_status = ret;
 169         major_status = GSS_S_FAILURE;
 170         goto out;
 171     }
 172
 173     buffer.value = data.data;
 174     buffer.length = data.length;
 175
 176     major_status = gss_set_cred_option(minor_status,
 177                                        cred,
 178                                        GSS_KRB5_IMPORT_CRED_X,
 179                                        &buffer);
 180     krb5_data_free(&data);
 181 out:
 182     if (sp)
 183         krb5_storage_free(sp);
 184     krb5_free_context(context);
 185     return major_status;
 186 }
 187
 188 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 189 gsskrb5_register_acceptor_identity(const char *identity)
 190 {
 191         gssapi_mech_interface m;
 192         gss_buffer_desc buffer;
 193         OM_uint32 junk;
 194
 195         _gss_load_mech();
 196
 197         buffer.value = rk_UNCONST(identity);
 198         buffer.length = strlen(identity);
 199
 200         m = __gss_get_mechanism(GSS_KRB5_MECHANISM);
 201         if (m == NULL || m->gm_set_sec_context_option == NULL)
 202             return GSS_S_FAILURE;
 203
 204         return m->gm_set_sec_context_option(&junk, NULL,
 205                 GSS_KRB5_REGISTER_ACCEPTOR_IDENTITY_X, &buffer);
 206 }
 207
 208 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 209 krb5_gss_register_acceptor_identity(const char *identity)
 210 {
 211     return gsskrb5_register_acceptor_identity(identity);
 212 }
 213
 214
 215 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 216 gsskrb5_set_dns_canonicalize(int flag)
 217 {
 218         struct _gss_mech_switch *m;
 219         gss_buffer_desc buffer;
 220         OM_uint32 junk;
 221         char b = (flag != 0);
 222
 223         _gss_load_mech();
 224
 225         buffer.value = &b;
 226         buffer.length = sizeof(b);
 227
 228         HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 229                 if (m->gm_mech.gm_set_sec_context_option == NULL)
 230                         continue;
 231                 m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 232                     GSS_KRB5_SET_DNS_CANONICALIZE_X, &buffer);
 233         }
 234
 235         return (GSS_S_COMPLETE);
 236 }
 237
 238
 239
 240 static krb5_error_code
 241 set_key(krb5_keyblock *keyblock, gss_krb5_lucid_key_t *key)
 242 {
 243     key->type = keyblock->keytype;
 244     key->length = keyblock->keyvalue.length;
 245     key->data = malloc(key->length);
 246     if (key->data == NULL && key->length != 0)
 247         return ENOMEM;
 248     memcpy(key->data, keyblock->keyvalue.data, key->length);
 249     return 0;
 250 }
 251
 252 static void
 253 free_key(gss_krb5_lucid_key_t *key)
 254 {
 255     memset(key->data, 0, key->length);
 256     free(key->data);
 257     memset(key, 0, sizeof(*key));
 258 }
 259
 260 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 261 gss_krb5_export_lucid_sec_context(OM_uint32 *minor_status,
 262                                   gss_ctx_id_t *context_handle,
 263                                   OM_uint32 version,
 264                                   void **rctx)
 265 {
 266     krb5_context context = NULL;
 267     krb5_error_code ret;
 268     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
 269     OM_uint32 major_status;
 270     gss_krb5_lucid_context_v1_t *ctx = NULL;
 271     krb5_storage *sp = NULL;
 272     uint32_t num;
 273
 274     if (context_handle == NULL
 275         || *context_handle == GSS_C_NO_CONTEXT
 276         || version != 1)
 277     {
 278         *minor_status = EINVAL;
 279         return GSS_S_FAILURE;
 280     }
 281
 282     major_status =
 283         gss_inquire_sec_context_by_oid (minor_status,
 284                                         *context_handle,
 285                                         GSS_KRB5_EXPORT_LUCID_CONTEXT_V1_X,
 286                                         &data_set);
 287     if (major_status)
 288         return major_status;
 289
 290     if (data_set == GSS_C_NO_BUFFER_SET || data_set->count != 1) {
 291         gss_release_buffer_set(minor_status, &data_set);
 292         *minor_status = EINVAL;
 293         return GSS_S_FAILURE;
 294     }
 295
 296     ret = krb5_init_context(&context);
 297     if (ret)
 298         goto out;
 299
 300     ctx = calloc(1, sizeof(*ctx));
 301     if (ctx == NULL) {
 302         ret = ENOMEM;
 303         goto out;
 304     }
 305
 306     sp = krb5_storage_from_mem(data_set->elements[0].value,
 307                                data_set->elements[0].length);
 308     if (sp == NULL) {
 309         ret = ENOMEM;
 310         goto out;
 311     }
 312
 313     ret = krb5_ret_uint32(sp, &num);
 314     if (ret) goto out;
 315     if (num != 1) {
 316         ret = EINVAL;
 317         goto out;
 318     }
 319     ctx->version = 1;
 320     /* initiator */
 321     ret = krb5_ret_uint32(sp, &ctx->initiate);
 322     if (ret) goto out;
 323     /* endtime */
 324     ret = krb5_ret_uint32(sp, &ctx->endtime);
 325     if (ret) goto out;
 326     /* send_seq */
 327     ret = krb5_ret_uint32(sp, &num);
 328     if (ret) goto out;
 329     ctx->send_seq = ((uint64_t)num) << 32;
 330     ret = krb5_ret_uint32(sp, &num);
 331     if (ret) goto out;
 332     ctx->send_seq |= num;
 333     /* recv_seq */
 334     ret = krb5_ret_uint32(sp, &num);
 335     if (ret) goto out;
 336     ctx->recv_seq = ((uint64_t)num) << 32;
 337     ret = krb5_ret_uint32(sp, &num);
 338     if (ret) goto out;
 339     ctx->recv_seq |= num;
 340     /* protocol */
 341     ret = krb5_ret_uint32(sp, &ctx->protocol);
 342     if (ret) goto out;
 343     if (ctx->protocol == 0) {
 344         krb5_keyblock key;
 345
 346         /* sign_alg */
 347         ret = krb5_ret_uint32(sp, &ctx->rfc1964_kd.sign_alg);
 348         if (ret) goto out;
 349         /* seal_alg */
 350         ret = krb5_ret_uint32(sp, &ctx->rfc1964_kd.seal_alg);
 351         if (ret) goto out;
 352         /* ctx_key */
 353         ret = krb5_ret_keyblock(sp, &key);
 354         if (ret) goto out;
 355         ret = set_key(&key, &ctx->rfc1964_kd.ctx_key);
 356         krb5_free_keyblock_contents(context, &key);
 357         if (ret) goto out;
 358     } else if (ctx->protocol == 1) {
 359         krb5_keyblock key;
 360
 361         /* acceptor_subkey */
 362         ret = krb5_ret_uint32(sp, &ctx->cfx_kd.have_acceptor_subkey);
 363         if (ret) goto out;
 364         /* ctx_key */
 365         ret = krb5_ret_keyblock(sp, &key);
 366         if (ret) goto out;
 367         ret = set_key(&key, &ctx->cfx_kd.ctx_key);
 368         krb5_free_keyblock_contents(context, &key);
 369         if (ret) goto out;
 370         /* acceptor_subkey */
 371         if (ctx->cfx_kd.have_acceptor_subkey) {
 372             ret = krb5_ret_keyblock(sp, &key);
 373             if (ret) goto out;
 374             ret = set_key(&key, &ctx->cfx_kd.acceptor_subkey);
 375             krb5_free_keyblock_contents(context, &key);
 376             if (ret) goto out;
 377         }
 378     } else {
 379         ret = EINVAL;
 380         goto out;
 381     }
 382
 383     *rctx = ctx;
 384
 385 out:
 386     gss_release_buffer_set(minor_status, &data_set);
 387     if (sp)
 388         krb5_storage_free(sp);
 389     if (context)
 390         krb5_free_context(context);
 391
 392     if (ret) {
 393         if (ctx)
 394             gss_krb5_free_lucid_sec_context(NULL, ctx);
 395
 396         *minor_status = ret;
 397         return GSS_S_FAILURE;
 398     }
 399     *minor_status = 0;
 400     return GSS_S_COMPLETE;
 401 }
 402
 403 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 404 gss_krb5_free_lucid_sec_context(OM_uint32 *minor_status, void *c)
 405 {
 406     gss_krb5_lucid_context_v1_t *ctx = c;
 407
 408     if (ctx->version != 1) {
 409         if (minor_status)
 410             *minor_status = 0;
 411         return GSS_S_FAILURE;
 412     }
 413
 414     if (ctx->protocol == 0) {
 415         free_key(&ctx->rfc1964_kd.ctx_key);
 416     } else if (ctx->protocol == 1) {
 417         free_key(&ctx->cfx_kd.ctx_key);
 418         if (ctx->cfx_kd.have_acceptor_subkey)
 419             free_key(&ctx->cfx_kd.acceptor_subkey);
 420     }
 421     free(ctx);
 422     if (minor_status)
 423         *minor_status = 0;
 424     return GSS_S_COMPLETE;
 425 }
 426
 427 /*
 428  *
 429  */
 430
 431 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 432 gss_krb5_set_allowable_enctypes(OM_uint32 *minor_status,
 433                                 gss_cred_id_t cred,
 434                                 OM_uint32 num_enctypes,
 435                                 krb5_enctype *enctypes)
 436 {
 437     krb5_error_code ret;
 438     OM_uint32 maj_status;
 439     gss_buffer_desc buffer;
 440     krb5_storage *sp;
 441     krb5_data data;
 442     size_t i;
 443
 444     sp = krb5_storage_emem();
 445     if (sp == NULL) {
 446         *minor_status = ENOMEM;
 447         maj_status = GSS_S_FAILURE;
 448         goto out;
 449     }
 450
 451     for (i = 0; i < num_enctypes; i++) {
 452         ret = krb5_store_int32(sp, enctypes[i]);
 453         if (ret) {
 454             *minor_status = ret;
 455             maj_status = GSS_S_FAILURE;
 456             goto out;
 457         }
 458     }
 459
 460     ret = krb5_storage_to_data(sp, &data);
 461     if (ret) {
 462         *minor_status = ret;
 463         maj_status = GSS_S_FAILURE;
 464         goto out;
 465     }
 466
 467     buffer.value = data.data;
 468     buffer.length = data.length;
 469
 470     maj_status = gss_set_cred_option(minor_status,
 471                                      &cred,
 472                                      GSS_KRB5_SET_ALLOWABLE_ENCTYPES_X,
 473                                      &buffer);
 474     krb5_data_free(&data);
 475 out:
 476     if (sp)
 477         krb5_storage_free(sp);
 478     return maj_status;
 479 }
 480
 481 /*
 482  *
 483  */
 484
 485 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 486 gsskrb5_set_send_to_kdc(struct gsskrb5_send_to_kdc *c)
 487 {
 488     struct _gss_mech_switch *m;
 489     gss_buffer_desc buffer;
 490     OM_uint32 junk;
 491
 492     _gss_load_mech();
 493
 494     if (c) {
 495         buffer.value = c;
 496         buffer.length = sizeof(*c);
 497     } else {
 498         buffer.value = NULL;
 499         buffer.length = 0;
 500     }
 501
 502     HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 503         if (m->gm_mech.gm_set_sec_context_option == NULL)
 504             continue;
 505         m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 506             GSS_KRB5_SEND_TO_KDC_X, &buffer);
 507     }
 508
 509     return (GSS_S_COMPLETE);
 510 }
 511
 512 /*
 513  *
 514  */
 515
 516 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 517 gss_krb5_ccache_name(OM_uint32 *minor_status,
 518                      const char *name,
 519                      const char **out_name)
 520 {
 521     struct _gss_mech_switch *m;
 522     gss_buffer_desc buffer;
 523     OM_uint32 junk;
 524
 525     _gss_load_mech();
 526
 527     if (out_name)
 528         *out_name = NULL;
 529
 530     buffer.value = rk_UNCONST(name);
 531     buffer.length = strlen(name);
 532
 533     HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 534         if (m->gm_mech.gm_set_sec_context_option == NULL)
 535             continue;
 536         m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 537             GSS_KRB5_CCACHE_NAME_X, &buffer);
 538     }
 539
 540     return (GSS_S_COMPLETE);
 541 }
 542
 543
 544 /*
 545  *
 546  */
 547
 548 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 549 gsskrb5_extract_authtime_from_sec_context(OM_uint32 *minor_status,
 550                                           gss_ctx_id_t context_handle,
 551                                           time_t *authtime)
 552 {
 553     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
 554     OM_uint32 maj_stat;
 555
 556     if (context_handle == GSS_C_NO_CONTEXT) {
 557         *minor_status = EINVAL;
 558         return GSS_S_FAILURE;
 559     }
 560
 561     maj_stat =
 562         gss_inquire_sec_context_by_oid (minor_status,
 563                                         context_handle,
 564                                         GSS_KRB5_GET_AUTHTIME_X,
 565                                         &data_set);
 566     if (maj_stat)
 567         return maj_stat;
 568
 569     if (data_set == GSS_C_NO_BUFFER_SET) {
 570         gss_release_buffer_set(minor_status, &data_set);
 571         *minor_status = EINVAL;
 572         return GSS_S_FAILURE;
 573     }
 574
 575     if (data_set->count != 1) {
 576         gss_release_buffer_set(minor_status, &data_set);
 577         *minor_status = EINVAL;
 578         return GSS_S_FAILURE;
 579     }
 580
 581     if (data_set->elements[0].length != 4) {
 582         gss_release_buffer_set(minor_status, &data_set);
 583         *minor_status = EINVAL;
 584         return GSS_S_FAILURE;
 585     }
 586
 587     {
 588         unsigned char *buf = data_set->elements[0].value;
 589         *authtime = (buf[3] <<24) | (buf[2] << 16) |
 590             (buf[1] << 8) | (buf[0] << 0);
 591     }
 592
 593     gss_release_buffer_set(minor_status, &data_set);
 594
 595     *minor_status = 0;
 596     return GSS_S_COMPLETE;
 597 }
 598
 599 /*
 600  *
 601  */
 602
 603 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 604 gsskrb5_extract_authz_data_from_sec_context(OM_uint32 *minor_status,
 605                                             gss_ctx_id_t context_handle,
 606                                             int ad_type,
 607                                             gss_buffer_t ad_data)
 608 {
 609     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
 610     OM_uint32 maj_stat, tmp;
 611     gss_OID_desc oid_flat;
 612     heim_oid baseoid, oid;
 613     size_t size;
 614
 615     if (context_handle == GSS_C_NO_CONTEXT) {
 616         *minor_status = EINVAL;
 617         return GSS_S_FAILURE;
 618     }
 619
 620     /* All this to append an integer to an oid... */
 621
 622     if (der_get_oid(GSS_KRB5_EXTRACT_AUTHZ_DATA_FROM_SEC_CONTEXT_X->elements,
 623                     GSS_KRB5_EXTRACT_AUTHZ_DATA_FROM_SEC_CONTEXT_X->length,
 624                     &baseoid, NULL) != 0) {
 625         *minor_status = EINVAL;
 626         return GSS_S_FAILURE;
 627     }
 628
 629     oid.length = baseoid.length + 1;
 630     oid.components = calloc(oid.length, sizeof(*oid.components));
 631     if (oid.components == NULL) {
 632         der_free_oid(&baseoid);
 633
 634         *minor_status = ENOMEM;
 635         return GSS_S_FAILURE;
 636     }
 637
 638     memcpy(oid.components, baseoid.components,
 639            baseoid.length * sizeof(*baseoid.components));
 640
 641     der_free_oid(&baseoid);
 642
 643     oid.components[oid.length - 1] = ad_type;
 644
 645     oid_flat.length = der_length_oid(&oid);
 646     oid_flat.elements = malloc(oid_flat.length);
 647     if (oid_flat.elements == NULL) {
 648         free(oid.components);
 649         *minor_status = ENOMEM;
 650         return GSS_S_FAILURE;
 651     }
 652
 653     if (der_put_oid((unsigned char *)oid_flat.elements + oid_flat.length - 1,
 654                     oid_flat.length, &oid, &size) != 0) {
 655         free(oid.components);
 656         _gss_free_oid(&tmp, &oid_flat);
 657         *minor_status = EINVAL;
 658         return GSS_S_FAILURE;
 659     }
 660     if (oid_flat.length != size)
 661         abort();
 662
 663     free(oid.components);
 664
 665     /* FINALLY, we have the OID */
 666
 667     maj_stat = gss_inquire_sec_context_by_oid (minor_status,
 668                                                context_handle,
 669                                                &oid_flat,
 670                                                &data_set);
 671
 672     _gss_free_oid(&tmp, &oid_flat);
 673
 674     if (maj_stat)
 675         return maj_stat;
 676
 677     if (data_set == GSS_C_NO_BUFFER_SET || data_set->count != 1) {
 678         gss_release_buffer_set(minor_status, &data_set);
 679         *minor_status = EINVAL;
 680         return GSS_S_FAILURE;
 681     }
 682
 683     ad_data->value = malloc(data_set->elements[0].length);
 684     if (ad_data->value == NULL) {
 685         gss_release_buffer_set(minor_status, &data_set);
 686         *minor_status = ENOMEM;
 687         return GSS_S_FAILURE;
 688     }
 689
 690     ad_data->length = data_set->elements[0].length;
 691     memcpy(ad_data->value, data_set->elements[0].value, ad_data->length);
 692     gss_release_buffer_set(minor_status, &data_set);
 693
 694     *minor_status = 0;
 695     return GSS_S_COMPLETE;
 696 }
 697
 698 /*
 699  *
 700  */
 701
 702 static OM_uint32
 703 gsskrb5_extract_key(OM_uint32 *minor_status,
 704                     gss_ctx_id_t context_handle,
 705                     const gss_OID oid,
 706                     krb5_keyblock **keyblock)
 707 {
 708     krb5_error_code ret;
 709     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
 710     OM_uint32 major_status;
 711     krb5_context context = NULL;
 712     krb5_storage *sp = NULL;
 713
 714     if (context_handle == GSS_C_NO_CONTEXT) {
 715         *minor_status = EINVAL;
 716         return GSS_S_FAILURE;
 717     }
 718
 719     ret = krb5_init_context(&context);
 720     if(ret) {
 721         *minor_status = ret;
 722         return GSS_S_FAILURE;
 723     }
 724
 725     major_status =
 726         gss_inquire_sec_context_by_oid (minor_status,
 727                                         context_handle,
 728                                         oid,
 729                                         &data_set);
 730     if (major_status)
 731         return major_status;
 732
 733     if (data_set == GSS_C_NO_BUFFER_SET || data_set->count != 1) {
 734         gss_release_buffer_set(minor_status, &data_set);
 735         *minor_status = EINVAL;
 736         return GSS_S_FAILURE;
 737     }
 738
 739     sp = krb5_storage_from_mem(data_set->elements[0].value,
 740                                data_set->elements[0].length);
 741     if (sp == NULL) {
 742         ret = ENOMEM;
 743         goto out;
 744     }
 745
 746     *keyblock = calloc(1, sizeof(**keyblock));
 747     if (keyblock == NULL) {
 748         ret = ENOMEM;
 749         goto out;
 750     }
 751
 752     ret = krb5_ret_keyblock(sp, *keyblock);
 753
 754 out:
 755     gss_release_buffer_set(minor_status, &data_set);
 756     if (sp)
 757         krb5_storage_free(sp);
 758     if (ret && keyblock) {
 759         krb5_free_keyblock(context, *keyblock);
 760         *keyblock = NULL;
 761     }
 762     if (context)
 763         krb5_free_context(context);
 764
 765     *minor_status = ret;
 766     if (ret)
 767         return GSS_S_FAILURE;
 768
 769     return GSS_S_COMPLETE;
 770 }
 771
 772 /*
 773  *
 774  */
 775
 776 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 777 gsskrb5_extract_service_keyblock(OM_uint32 *minor_status,
 778                                  gss_ctx_id_t context_handle,
 779                                  krb5_keyblock **keyblock)
 780 {
 781     return gsskrb5_extract_key(minor_status,
 782                                context_handle,
 783                                GSS_KRB5_GET_SERVICE_KEYBLOCK_X,
 784                                keyblock);
 785 }
 786
 787 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 788 gsskrb5_get_initiator_subkey(OM_uint32 *minor_status,
 789                              gss_ctx_id_t context_handle,
 790                              krb5_keyblock **keyblock)
 791 {
 792     return gsskrb5_extract_key(minor_status,
 793                                context_handle,
 794                                GSS_KRB5_GET_INITIATOR_SUBKEY_X,
 795                                keyblock);
 796 }
 797
 798 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 799 gsskrb5_get_subkey(OM_uint32 *minor_status,
 800                    gss_ctx_id_t context_handle,
 801                    krb5_keyblock **keyblock)
 802 {
 803     return gsskrb5_extract_key(minor_status,
 804                                context_handle,
 805                                GSS_KRB5_GET_SUBKEY_X,
 806                                keyblock);
 807 }
 808
 809 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 810 gsskrb5_set_default_realm(const char *realm)
 811 {
 812         struct _gss_mech_switch *m;
 813         gss_buffer_desc buffer;
 814         OM_uint32 junk;
 815
 816         _gss_load_mech();
 817
 818         buffer.value = rk_UNCONST(realm);
 819         buffer.length = strlen(realm);
 820
 821         HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 822                 if (m->gm_mech.gm_set_sec_context_option == NULL)
 823                         continue;
 824                 m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 825                     GSS_KRB5_SET_DEFAULT_REALM_X, &buffer);
 826         }
 827
 828         return (GSS_S_COMPLETE);
 829 }
 830
 831 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 832 gss_krb5_get_tkt_flags(OM_uint32 *minor_status,
 833                        gss_ctx_id_t context_handle,
 834                        OM_uint32 *tkt_flags)
 835 {
 836
 837     OM_uint32 major_status;
 838     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
 839
 840     if (context_handle == GSS_C_NO_CONTEXT) {
 841         *minor_status = EINVAL;
 842         return GSS_S_FAILURE;
 843     }
 844
 845     major_status =
 846         gss_inquire_sec_context_by_oid (minor_status,
 847                                         context_handle,
 848                                         GSS_KRB5_GET_TKT_FLAGS_X,
 849                                         &data_set);
 850     if (major_status)
 851         return major_status;
 852
 853     if (data_set == GSS_C_NO_BUFFER_SET ||
 854         data_set->count != 1 ||
 855         data_set->elements[0].length < 4) {
 856         gss_release_buffer_set(minor_status, &data_set);
 857         *minor_status = EINVAL;
 858         return GSS_S_FAILURE;
 859     }
 860
 861     {
 862         const u_char *p = data_set->elements[0].value;
 863         *tkt_flags = (p[0] << 0) | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
 864     }
 865
 866     gss_release_buffer_set(minor_status, &data_set);
 867     return GSS_S_COMPLETE;
 868 }
 869
 870 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 871 gsskrb5_set_time_offset(int offset)
 872 {
 873         struct _gss_mech_switch *m;
 874         gss_buffer_desc buffer;
 875         OM_uint32 junk;
 876         int32_t o = offset;
 877
 878         _gss_load_mech();
 879
 880         buffer.value = &o;
 881         buffer.length = sizeof(o);
 882
 883         HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 884                 if (m->gm_mech.gm_set_sec_context_option == NULL)
 885                         continue;
 886                 m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 887                     GSS_KRB5_SET_TIME_OFFSET_X, &buffer);
 888         }
 889
 890         return (GSS_S_COMPLETE);
 891 }
 892
 893 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 894 gsskrb5_get_time_offset(int *offset)
 895 {
 896         struct _gss_mech_switch *m;
 897         gss_buffer_desc buffer;
 898         OM_uint32 maj_stat, junk;
 899         int32_t o;
 900
 901         _gss_load_mech();
 902
 903         buffer.value = &o;
 904         buffer.length = sizeof(o);
 905
 906         HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 907                 if (m->gm_mech.gm_set_sec_context_option == NULL)
 908                         continue;
 909                 maj_stat = m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 910                     GSS_KRB5_GET_TIME_OFFSET_X, &buffer);
 911
 912                 if (maj_stat == GSS_S_COMPLETE) {
 913                         *offset = o;
 914                         return maj_stat;
 915                 }
 916         }
 917
 918         return (GSS_S_UNAVAILABLE);
 919 }
 920
 921 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 922 gsskrb5_plugin_register(struct gsskrb5_krb5_plugin *c)
 923 {
 924     struct _gss_mech_switch *m;
 925     gss_buffer_desc buffer;
 926     OM_uint32 junk;
 927
 928     _gss_load_mech();
 929
 930     buffer.value = c;
 931     buffer.length = sizeof(*c);
 932
 933     HEIM_SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 934         if (m->gm_mech.gm_set_sec_context_option == NULL)
 935             continue;
 936         m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 937             GSS_KRB5_PLUGIN_REGISTER_X, &buffer);
 938     }
 939
 940     return (GSS_S_COMPLETE);
 941 }