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 OM_uint32 GSSAPI_LIB_FUNCTION
  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;
  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 == -1) {
  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 OM_uint32 GSSAPI_LIB_FUNCTION
  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 OM_uint32 GSSAPI_LIB_FUNCTION
 189 gsskrb5_register_acceptor_identity(const char *identity)
 190 {
 191         struct _gss_mech_switch *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         SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 201                 if (m->gm_mech.gm_set_sec_context_option == NULL)
 202                         continue;
 203                 m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 204                     GSS_KRB5_REGISTER_ACCEPTOR_IDENTITY_X, &buffer);
 205         }
 206
 207         return (GSS_S_COMPLETE);
 208 }
 209
 210 OM_uint32 GSSAPI_LIB_FUNCTION
 211 krb5_gss_register_acceptor_identity(const char *identity)
 212 {
 213     return gsskrb5_register_acceptor_identity(identity);
 214 }
 215
 216
 217 OM_uint32 GSSAPI_LIB_FUNCTION
 218 gsskrb5_set_dns_canonicalize(int flag)
 219 {
 220         struct _gss_mech_switch *m;
 221         gss_buffer_desc buffer;
 222         OM_uint32 junk;
 223         char b = (flag != 0);
 224
 225         _gss_load_mech();
 226
 227         buffer.value = &b;
 228         buffer.length = sizeof(b);
 229
 230         SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 231                 if (m->gm_mech.gm_set_sec_context_option == NULL)
 232                         continue;
 233                 m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 234                     GSS_KRB5_SET_DNS_CANONICALIZE_X, &buffer);
 235         }
 236
 237         return (GSS_S_COMPLETE);
 238 }
 239
 240
 241
 242 static krb5_error_code
 243 set_key(krb5_keyblock *keyblock, gss_krb5_lucid_key_t *key)
 244 {
 245     key->type = keyblock->keytype;
 246     key->length = keyblock->keyvalue.length;
 247     key->data = malloc(key->length);
 248     if (key->data == NULL && key->length != 0)
 249         return ENOMEM;
 250     memcpy(key->data, keyblock->keyvalue.data, key->length);
 251     return 0;
 252 }
 253
 254 static void
 255 free_key(gss_krb5_lucid_key_t *key)
 256 {
 257     memset(key->data, 0, key->length);
 258     free(key->data);
 259     memset(key, 0, sizeof(*key));
 260 }
 261
 262 OM_uint32 GSSAPI_LIB_FUNCTION
 263 gss_krb5_export_lucid_sec_context(OM_uint32 *minor_status,
 264                                   gss_ctx_id_t *context_handle,
 265                                   OM_uint32 version,
 266                                   void **rctx)
 267 {
 268     krb5_context context = NULL;
 269     krb5_error_code ret;
 270     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
 271     OM_uint32 major_status;
 272     gss_krb5_lucid_context_v1_t *ctx = NULL;
 273     krb5_storage *sp = NULL;
 274     uint32_t num;
 275
 276     if (context_handle == NULL
 277         || *context_handle == GSS_C_NO_CONTEXT
 278         || version != 1)
 279     {
 280         *minor_status = EINVAL;
 281         return GSS_S_FAILURE;
 282     }
 283
 284     major_status =
 285         gss_inquire_sec_context_by_oid (minor_status,
 286                                         *context_handle,
 287                                         GSS_KRB5_EXPORT_LUCID_CONTEXT_V1_X,
 288                                         &data_set);
 289     if (major_status)
 290         return major_status;
 291
 292     if (data_set == GSS_C_NO_BUFFER_SET || data_set->count != 1) {
 293         gss_release_buffer_set(minor_status, &data_set);
 294         *minor_status = EINVAL;
 295         return GSS_S_FAILURE;
 296     }
 297
 298     ret = krb5_init_context(&context);
 299     if (ret)
 300         goto out;
 301
 302     ctx = calloc(1, sizeof(*ctx));
 303     if (ctx == NULL) {
 304         ret = ENOMEM;
 305         goto out;
 306     }
 307
 308     sp = krb5_storage_from_mem(data_set->elements[0].value,
 309                                data_set->elements[0].length);
 310     if (sp == NULL) {
 311         ret = ENOMEM;
 312         goto out;
 313     }
 314
 315     ret = krb5_ret_uint32(sp, &num);
 316     if (ret) goto out;
 317     if (num != 1) {
 318         ret = EINVAL;
 319         goto out;
 320     }
 321     ctx->version = 1;
 322     /* initiator */
 323     ret = krb5_ret_uint32(sp, &ctx->initiate);
 324     if (ret) goto out;
 325     /* endtime */
 326     ret = krb5_ret_uint32(sp, &ctx->endtime);
 327     if (ret) goto out;
 328     /* send_seq */
 329     ret = krb5_ret_uint32(sp, &num);
 330     if (ret) goto out;
 331     ctx->send_seq = ((uint64_t)num) << 32;
 332     ret = krb5_ret_uint32(sp, &num);
 333     if (ret) goto out;
 334     ctx->send_seq |= num;
 335     /* recv_seq */
 336     ret = krb5_ret_uint32(sp, &num);
 337     if (ret) goto out;
 338     ctx->recv_seq = ((uint64_t)num) << 32;
 339     ret = krb5_ret_uint32(sp, &num);
 340     if (ret) goto out;
 341     ctx->recv_seq |= num;
 342     /* protocol */
 343     ret = krb5_ret_uint32(sp, &ctx->protocol);
 344     if (ret) goto out;
 345     if (ctx->protocol == 0) {
 346         krb5_keyblock key;
 347
 348         /* sign_alg */
 349         ret = krb5_ret_uint32(sp, &ctx->rfc1964_kd.sign_alg);
 350         if (ret) goto out;
 351         /* seal_alg */
 352         ret = krb5_ret_uint32(sp, &ctx->rfc1964_kd.seal_alg);
 353         if (ret) goto out;
 354         /* ctx_key */
 355         ret = krb5_ret_keyblock(sp, &key);
 356         if (ret) goto out;
 357         ret = set_key(&key, &ctx->rfc1964_kd.ctx_key);
 358         krb5_free_keyblock_contents(context, &key);
 359         if (ret) goto out;
 360     } else if (ctx->protocol == 1) {
 361         krb5_keyblock key;
 362
 363         /* acceptor_subkey */
 364         ret = krb5_ret_uint32(sp, &ctx->cfx_kd.have_acceptor_subkey);
 365         if (ret) goto out;
 366         /* ctx_key */
 367         ret = krb5_ret_keyblock(sp, &key);
 368         if (ret) goto out;
 369         ret = set_key(&key, &ctx->cfx_kd.ctx_key);
 370         krb5_free_keyblock_contents(context, &key);
 371         if (ret) goto out;
 372         /* acceptor_subkey */
 373         if (ctx->cfx_kd.have_acceptor_subkey) {
 374             ret = krb5_ret_keyblock(sp, &key);
 375             if (ret) goto out;
 376             ret = set_key(&key, &ctx->cfx_kd.acceptor_subkey);
 377             krb5_free_keyblock_contents(context, &key);
 378             if (ret) goto out;
 379         }
 380     } else {
 381         ret = EINVAL;
 382         goto out;
 383     }
 384
 385     *rctx = ctx;
 386
 387 out:
 388     gss_release_buffer_set(minor_status, &data_set);
 389     if (sp)
 390         krb5_storage_free(sp);
 391     if (context)
 392         krb5_free_context(context);
 393
 394     if (ret) {
 395         if (ctx)
 396             gss_krb5_free_lucid_sec_context(NULL, ctx);
 397
 398         *minor_status = ret;
 399         return GSS_S_FAILURE;
 400     }
 401     *minor_status = 0;
 402     return GSS_S_COMPLETE;
 403 }
 404
 405 OM_uint32 GSSAPI_LIB_FUNCTION
 406 gss_krb5_free_lucid_sec_context(OM_uint32 *minor_status, void *c)
 407 {
 408     gss_krb5_lucid_context_v1_t *ctx = c;
 409
 410     if (ctx->version != 1) {
 411         if (minor_status)
 412             *minor_status = 0;
 413         return GSS_S_FAILURE;
 414     }
 415
 416     if (ctx->protocol == 0) {
 417         free_key(&ctx->rfc1964_kd.ctx_key);
 418     } else if (ctx->protocol == 1) {
 419         free_key(&ctx->cfx_kd.ctx_key);
 420         if (ctx->cfx_kd.have_acceptor_subkey)
 421             free_key(&ctx->cfx_kd.acceptor_subkey);
 422     }
 423     free(ctx);
 424     if (minor_status)
 425         *minor_status = 0;
 426     return GSS_S_COMPLETE;
 427 }
 428
 429 /*
 430  *
 431  */
 432
 433 OM_uint32 GSSAPI_LIB_FUNCTION
 434 gss_krb5_set_allowable_enctypes(OM_uint32 *minor_status,
 435                                 gss_cred_id_t cred,
 436                                 OM_uint32 num_enctypes,
 437                                 int32_t *enctypes)
 438 {
 439     krb5_error_code ret;
 440     OM_uint32 maj_status;
 441     gss_buffer_desc buffer;
 442     krb5_storage *sp;
 443     krb5_data data;
 444     int i;
 445
 446     sp = krb5_storage_emem();
 447     if (sp == NULL) {
 448         *minor_status = ENOMEM;
 449         maj_status = GSS_S_FAILURE;
 450         goto out;
 451     }
 452
 453     for (i = 0; i < num_enctypes; i++) {
 454         ret = krb5_store_int32(sp, enctypes[i]);
 455         if (ret) {
 456             *minor_status = ret;
 457             maj_status = GSS_S_FAILURE;
 458             goto out;
 459         }
 460     }
 461
 462     ret = krb5_storage_to_data(sp, &data);
 463     if (ret) {
 464         *minor_status = ret;
 465         maj_status = GSS_S_FAILURE;
 466         goto out;
 467     }
 468
 469     buffer.value = data.data;
 470     buffer.length = data.length;
 471
 472     maj_status = gss_set_cred_option(minor_status,
 473                                      &cred,
 474                                      GSS_KRB5_SET_ALLOWABLE_ENCTYPES_X,
 475                                      &buffer);
 476     krb5_data_free(&data);
 477 out:
 478     if (sp)
 479         krb5_storage_free(sp);
 480     return maj_status;
 481 }
 482
 483 /*
 484  *
 485  */
 486
 487 OM_uint32 GSSAPI_LIB_FUNCTION
 488 gsskrb5_set_send_to_kdc(struct gsskrb5_send_to_kdc *c)
 489 {
 490     struct _gss_mech_switch *m;
 491     gss_buffer_desc buffer;
 492     OM_uint32 junk;
 493
 494     _gss_load_mech();
 495
 496     if (c) {
 497         buffer.value = c;
 498         buffer.length = sizeof(*c);
 499     } else {
 500         buffer.value = NULL;
 501         buffer.length = 0;
 502     }
 503
 504     SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 505         if (m->gm_mech.gm_set_sec_context_option == NULL)
 506             continue;
 507         m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 508             GSS_KRB5_SEND_TO_KDC_X, &buffer);
 509     }
 510
 511     return (GSS_S_COMPLETE);
 512 }
 513
 514 /*
 515  *
 516  */
 517
 518 OM_uint32 GSSAPI_LIB_FUNCTION
 519 gss_krb5_ccache_name(OM_uint32 *minor_status,
 520                      const char *name,
 521                      const char **out_name)
 522 {
 523     struct _gss_mech_switch *m;
 524     gss_buffer_desc buffer;
 525     OM_uint32 junk;
 526
 527     _gss_load_mech();
 528
 529     if (out_name)
 530         *out_name = NULL;
 531
 532     buffer.value = rk_UNCONST(name);
 533     buffer.length = strlen(name);
 534
 535     SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 536         if (m->gm_mech.gm_set_sec_context_option == NULL)
 537             continue;
 538         m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 539             GSS_KRB5_CCACHE_NAME_X, &buffer);
 540     }
 541
 542     return (GSS_S_COMPLETE);
 543 }
 544
 545
 546 /*
 547  *
 548  */
 549
 550 OM_uint32 GSSAPI_LIB_FUNCTION
 551 gsskrb5_extract_authtime_from_sec_context(OM_uint32 *minor_status,
 552                                           gss_ctx_id_t context_handle,
 553                                           time_t *authtime)
 554 {
 555     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
 556     OM_uint32 maj_stat;
 557
 558     if (context_handle == GSS_C_NO_CONTEXT) {
 559         *minor_status = EINVAL;
 560         return GSS_S_FAILURE;
 561     }
 562
 563     maj_stat =
 564         gss_inquire_sec_context_by_oid (minor_status,
 565                                         context_handle,
 566                                         GSS_KRB5_GET_AUTHTIME_X,
 567                                         &data_set);
 568     if (maj_stat)
 569         return maj_stat;
 570
 571     if (data_set == GSS_C_NO_BUFFER_SET) {
 572         gss_release_buffer_set(minor_status, &data_set);
 573         *minor_status = EINVAL;
 574         return GSS_S_FAILURE;
 575     }
 576
 577     if (data_set->count != 1) {
 578         gss_release_buffer_set(minor_status, &data_set);
 579         *minor_status = EINVAL;
 580         return GSS_S_FAILURE;
 581     }
 582
 583     if (data_set->elements[0].length != 4) {
 584         gss_release_buffer_set(minor_status, &data_set);
 585         *minor_status = EINVAL;
 586         return GSS_S_FAILURE;
 587     }
 588
 589     {
 590         unsigned char *buf = data_set->elements[0].value;
 591         *authtime = (buf[3] <<24) | (buf[2] << 16) |
 592             (buf[1] << 8) | (buf[0] << 0);
 593     }
 594
 595     gss_release_buffer_set(minor_status, &data_set);
 596
 597     *minor_status = 0;
 598     return GSS_S_COMPLETE;
 599 }
 600
 601 /*
 602  *
 603  */
 604
 605 OM_uint32 GSSAPI_LIB_FUNCTION
 606 gsskrb5_extract_authz_data_from_sec_context(OM_uint32 *minor_status,
 607                                             gss_ctx_id_t context_handle,
 608                                             int ad_type,
 609                                             gss_buffer_t ad_data)
 610 {
 611     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
 612     OM_uint32 maj_stat;
 613     gss_OID_desc oid_flat;
 614     heim_oid baseoid, oid;
 615     size_t size;
 616
 617     if (context_handle == GSS_C_NO_CONTEXT) {
 618         *minor_status = EINVAL;
 619         return GSS_S_FAILURE;
 620     }
 621
 622     /* All this to append an integer to an oid... */
 623
 624     if (der_get_oid(GSS_KRB5_EXTRACT_AUTHZ_DATA_FROM_SEC_CONTEXT_X->elements,
 625                     GSS_KRB5_EXTRACT_AUTHZ_DATA_FROM_SEC_CONTEXT_X->length,
 626                     &baseoid, NULL) != 0) {
 627         *minor_status = EINVAL;
 628         return GSS_S_FAILURE;
 629     }
 630
 631     oid.length = baseoid.length + 1;
 632     oid.components = calloc(oid.length, sizeof(*oid.components));
 633     if (oid.components == NULL) {
 634         der_free_oid(&baseoid);
 635
 636         *minor_status = ENOMEM;
 637         return GSS_S_FAILURE;
 638     }
 639
 640     memcpy(oid.components, baseoid.components,
 641            baseoid.length * sizeof(*baseoid.components));
 642
 643     der_free_oid(&baseoid);
 644
 645     oid.components[oid.length - 1] = ad_type;
 646
 647     oid_flat.length = der_length_oid(&oid);
 648     oid_flat.elements = malloc(oid_flat.length);
 649     if (oid_flat.elements == NULL) {
 650         free(oid.components);
 651         *minor_status = ENOMEM;
 652         return GSS_S_FAILURE;
 653     }
 654
 655     if (der_put_oid((unsigned char *)oid_flat.elements + oid_flat.length - 1,
 656                     oid_flat.length, &oid, &size) != 0) {
 657         free(oid.components);
 658         free(oid_flat.elements);
 659         *minor_status = EINVAL;
 660         return GSS_S_FAILURE;
 661     }
 662     if (oid_flat.length != size)
 663         abort();
 664
 665     free(oid.components);
 666
 667     /* FINALLY, we have the OID */
 668
 669     maj_stat = gss_inquire_sec_context_by_oid (minor_status,
 670                                                context_handle,
 671                                                &oid_flat,
 672                                                &data_set);
 673
 674     free(oid_flat.elements);
 675
 676     if (maj_stat)
 677         return maj_stat;
 678
 679     if (data_set == GSS_C_NO_BUFFER_SET || data_set->count != 1) {
 680         gss_release_buffer_set(minor_status, &data_set);
 681         *minor_status = EINVAL;
 682         return GSS_S_FAILURE;
 683     }
 684
 685     ad_data->value = malloc(data_set->elements[0].length);
 686     if (ad_data->value == NULL) {
 687         gss_release_buffer_set(minor_status, &data_set);
 688         *minor_status = ENOMEM;
 689         return GSS_S_FAILURE;
 690     }
 691
 692     ad_data->length = data_set->elements[0].length;
 693     memcpy(ad_data->value, data_set->elements[0].value, ad_data->length);
 694     gss_release_buffer_set(minor_status, &data_set);
 695
 696     *minor_status = 0;
 697     return GSS_S_COMPLETE;
 698 }
 699
 700 /*
 701  *
 702  */
 703
 704 static OM_uint32
 705 gsskrb5_extract_key(OM_uint32 *minor_status,
 706                     gss_ctx_id_t context_handle,
 707                     const gss_OID oid,
 708                     krb5_keyblock **keyblock)
 709 {
 710     krb5_error_code ret;
 711     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
 712     OM_uint32 major_status;
 713     krb5_context context = NULL;
 714     krb5_storage *sp = NULL;
 715
 716     if (context_handle == GSS_C_NO_CONTEXT) {
 717         *minor_status = EINVAL;
 718         return GSS_S_FAILURE;
 719     }
 720
 721     ret = krb5_init_context(&context);
 722     if(ret) {
 723         *minor_status = ret;
 724         return GSS_S_FAILURE;
 725     }
 726
 727     major_status =
 728         gss_inquire_sec_context_by_oid (minor_status,
 729                                         context_handle,
 730                                         oid,
 731                                         &data_set);
 732     if (major_status)
 733         return major_status;
 734
 735     if (data_set == GSS_C_NO_BUFFER_SET || data_set->count != 1) {
 736         gss_release_buffer_set(minor_status, &data_set);
 737         *minor_status = EINVAL;
 738         return GSS_S_FAILURE;
 739     }
 740
 741     sp = krb5_storage_from_mem(data_set->elements[0].value,
 742                                data_set->elements[0].length);
 743     if (sp == NULL) {
 744         ret = ENOMEM;
 745         goto out;
 746     }
 747
 748     *keyblock = calloc(1, sizeof(**keyblock));
 749     if (keyblock == NULL) {
 750         ret = ENOMEM;
 751         goto out;
 752     }
 753
 754     ret = krb5_ret_keyblock(sp, *keyblock);
 755
 756 out:
 757     gss_release_buffer_set(minor_status, &data_set);
 758     if (sp)
 759         krb5_storage_free(sp);
 760     if (ret && keyblock) {
 761         krb5_free_keyblock(context, *keyblock);
 762         *keyblock = NULL;
 763     }
 764     if (context)
 765         krb5_free_context(context);
 766
 767     *minor_status = ret;
 768     if (ret)
 769         return GSS_S_FAILURE;
 770
 771     return GSS_S_COMPLETE;
 772 }
 773
 774 /*
 775  *
 776  */
 777
 778 OM_uint32 GSSAPI_LIB_FUNCTION
 779 gsskrb5_extract_service_keyblock(OM_uint32 *minor_status,
 780                                  gss_ctx_id_t context_handle,
 781                                  krb5_keyblock **keyblock)
 782 {
 783     return gsskrb5_extract_key(minor_status,
 784                                context_handle,
 785                                GSS_KRB5_GET_SERVICE_KEYBLOCK_X,
 786                                keyblock);
 787 }
 788
 789 OM_uint32 GSSAPI_LIB_FUNCTION
 790 gsskrb5_get_initiator_subkey(OM_uint32 *minor_status,
 791                              gss_ctx_id_t context_handle,
 792                              krb5_keyblock **keyblock)
 793 {
 794     return gsskrb5_extract_key(minor_status,
 795                                context_handle,
 796                                GSS_KRB5_GET_INITIATOR_SUBKEY_X,
 797                                keyblock);
 798 }
 799
 800 OM_uint32 GSSAPI_LIB_FUNCTION
 801 gsskrb5_get_subkey(OM_uint32 *minor_status,
 802                    gss_ctx_id_t context_handle,
 803                    krb5_keyblock **keyblock)
 804 {
 805     return gsskrb5_extract_key(minor_status,
 806                                context_handle,
 807                                GSS_KRB5_GET_SUBKEY_X,
 808                                keyblock);
 809 }
 810
 811 OM_uint32 GSSAPI_LIB_FUNCTION
 812 gsskrb5_set_default_realm(const char *realm)
 813 {
 814         struct _gss_mech_switch *m;
 815         gss_buffer_desc buffer;
 816         OM_uint32 junk;
 817
 818         _gss_load_mech();
 819
 820         buffer.value = rk_UNCONST(realm);
 821         buffer.length = strlen(realm);
 822
 823         SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 824                 if (m->gm_mech.gm_set_sec_context_option == NULL)
 825                         continue;
 826                 m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 827                     GSS_KRB5_SET_DEFAULT_REALM_X, &buffer);
 828         }
 829
 830         return (GSS_S_COMPLETE);
 831 }
 832
 833 OM_uint32 GSSAPI_LIB_FUNCTION
 834 gss_krb5_get_tkt_flags(OM_uint32 *minor_status,
 835                        gss_ctx_id_t context_handle,
 836                        OM_uint32 *tkt_flags)
 837 {
 838
 839     OM_uint32 major_status;
 840     gss_buffer_set_t data_set = GSS_C_NO_BUFFER_SET;
 841
 842     if (context_handle == GSS_C_NO_CONTEXT) {
 843         *minor_status = EINVAL;
 844         return GSS_S_FAILURE;
 845     }
 846
 847     major_status =
 848         gss_inquire_sec_context_by_oid (minor_status,
 849                                         context_handle,
 850                                         GSS_KRB5_GET_TKT_FLAGS_X,
 851                                         &data_set);
 852     if (major_status)
 853         return major_status;
 854
 855     if (data_set == GSS_C_NO_BUFFER_SET ||
 856         data_set->count != 1 ||
 857         data_set->elements[0].length < 4) {
 858         gss_release_buffer_set(minor_status, &data_set);
 859         *minor_status = EINVAL;
 860         return GSS_S_FAILURE;
 861     }
 862
 863     {
 864         const u_char *p = data_set->elements[0].value;
 865         *tkt_flags = (p[0] << 0) | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
 866     }
 867
 868     gss_release_buffer_set(minor_status, &data_set);
 869     return GSS_S_COMPLETE;
 870 }
 871
 872 OM_uint32 GSSAPI_LIB_FUNCTION
 873 gsskrb5_set_time_offset(int offset)
 874 {
 875         struct _gss_mech_switch *m;
 876         gss_buffer_desc buffer;
 877         OM_uint32 junk;
 878         int32_t o = offset;
 879
 880         _gss_load_mech();
 881
 882         buffer.value = &o;
 883         buffer.length = sizeof(o);
 884
 885         SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 886                 if (m->gm_mech.gm_set_sec_context_option == NULL)
 887                         continue;
 888                 m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 889                     GSS_KRB5_SET_TIME_OFFSET_X, &buffer);
 890         }
 891
 892         return (GSS_S_COMPLETE);
 893 }
 894
 895 OM_uint32 GSSAPI_LIB_FUNCTION
 896 gsskrb5_get_time_offset(int *offset)
 897 {
 898         struct _gss_mech_switch *m;
 899         gss_buffer_desc buffer;
 900         OM_uint32 maj_stat, junk;
 901         int32_t o;
 902
 903         _gss_load_mech();
 904
 905         buffer.value = &o;
 906         buffer.length = sizeof(o);
 907
 908         SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 909                 if (m->gm_mech.gm_set_sec_context_option == NULL)
 910                         continue;
 911                 maj_stat = m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 912                     GSS_KRB5_GET_TIME_OFFSET_X, &buffer);
 913
 914                 if (maj_stat == GSS_S_COMPLETE) {
 915                         *offset = o;
 916                         return maj_stat;
 917                 }
 918         }
 919
 920         return (GSS_S_UNAVAILABLE);
 921 }
 922
 923 OM_uint32 GSSAPI_LIB_FUNCTION
 924 gsskrb5_plugin_register(struct gsskrb5_krb5_plugin *c)
 925 {
 926     struct _gss_mech_switch *m;
 927     gss_buffer_desc buffer;
 928     OM_uint32 junk;
 929
 930     _gss_load_mech();
 931
 932     buffer.value = c;
 933     buffer.length = sizeof(*c);
 934
 935     SLIST_FOREACH(m, &_gss_mechs, gm_link) {
 936         if (m->gm_mech.gm_set_sec_context_option == NULL)
 937             continue;
 938         m->gm_mech.gm_set_sec_context_option(&junk, NULL,
 939             GSS_KRB5_PLUGIN_REGISTER_X, &buffer);
 940     }
 941
 942     return (GSS_S_COMPLETE);
 943 }