source3/libads/kerberos_verify.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    kerberos utility library
   4    Copyright (C) Andrew Tridgell 2001
   5    Copyright (C) Remus Koos 2001
   6    Copyright (C) Luke Howard 2003
   7    Copyright (C) Guenther Deschner 2003, 2005
   8    Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2003
   9    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
  10    Copyright (C) Jeremy Allison 2007
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 #include "includes.h"
  27
  28 #ifdef HAVE_KRB5
  29
  30 #if !defined(HAVE_KRB5_PRINC_COMPONENT)
  31 const krb5_data *krb5_princ_component(krb5_context, krb5_principal, int );
  32 #endif
  33
  34 static bool ads_dedicated_keytab_verify_ticket(krb5_context context,
  35                                           krb5_auth_context auth_context,
  36                                           const DATA_BLOB *ticket,
  37                                           krb5_ticket **pp_tkt,
  38                                           krb5_keyblock **keyblock,
  39                                           krb5_error_code *perr)
  40 {
  41         krb5_error_code ret = 0;
  42         bool auth_ok = false;
  43         krb5_keytab keytab = NULL;
  44         krb5_keytab_entry kt_entry;
  45         krb5_ticket *dec_ticket = NULL;
  46
  47         krb5_data packet;
  48
  49         *pp_tkt = NULL;
  50         *keyblock = NULL;
  51         *perr = 0;
  52
  53         ZERO_STRUCT(kt_entry);
  54
  55         ret = smb_krb5_open_keytab(context, lp_dedicated_keytab_file(), true,
  56             &keytab);
  57         if (ret) {
  58                 DEBUG(1, ("smb_krb5_open_keytab failed (%s)\n",
  59                         error_message(ret)));
  60                 goto out;
  61         }
  62
  63         packet.length = ticket->length;
  64         packet.data = (char *)ticket->data;
  65         *pp_tkt = NULL;
  66
  67         ret = krb5_rd_req(context, &auth_context, &packet, NULL, keytab,
  68             NULL, &dec_ticket);
  69         if (ret) {
  70                 DEBUG(0, ("krb5_rd_req failed (%s)\n", error_message(ret)));
  71                 goto out;
  72         }
  73
  74         /* Get the key for checking the pac signature */
  75         ret = krb5_kt_get_entry(context, keytab, dec_ticket->server,
  76             dec_ticket->enc_part.kvno, dec_ticket->enc_part.enctype,
  77             &kt_entry);
  78         if (ret) {
  79                 DEBUG(0, ("krb5_kt_get_entry failed (%s)\n",
  80                           error_message(ret)));
  81                 goto out;
  82         }
  83
  84 #ifdef HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK /* Heimdal */
  85         ret = krb5_copy_keyblock(context, &kt_entry.keyblock, keyblock);
  86 #elif defined(HAVE_KRB5_KEYTAB_ENTRY_KEY) /* MIT */
  87         ret = krb5_copy_keyblock(context, &kt_entry.key, keyblock);
  88 #else
  89 #error UNKNOWN_KRB5_KEYTAB_ENTRY_FORMAT
  90 #endif
  91         smb_krb5_kt_free_entry(context, &kt_entry);
  92
  93         if (ret) {
  94                 DEBUG(0, ("failed to copy key: %s\n",
  95                           error_message(ret)));
  96                 goto out;
  97         }
  98
  99         auth_ok = true;
 100         *pp_tkt = dec_ticket;
 101         dec_ticket = NULL;
 102
 103   out:
 104         if (dec_ticket)
 105                 krb5_free_ticket(context, dec_ticket);
 106
 107         if (keytab)
 108                 krb5_kt_close(context, keytab);
 109
 110         *perr = ret;
 111         return auth_ok;
 112 }
 113
 114 /**********************************************************************************
 115  Try to verify a ticket using the system keytab... the system keytab has kvno -1 entries, so
 116  it's more like what microsoft does... see comment in utils/net_ads.c in the
 117  ads_keytab_add_entry function for details.
 118 ***********************************************************************************/
 119
 120 static bool ads_keytab_verify_ticket(krb5_context context,
 121                                         krb5_auth_context auth_context,
 122                                         const DATA_BLOB *ticket,
 123                                         krb5_ticket **pp_tkt,
 124                                         krb5_keyblock **keyblock,
 125                                         krb5_error_code *perr)
 126 {
 127         krb5_error_code ret = 0;
 128         bool auth_ok = False;
 129         krb5_keytab keytab = NULL;
 130         krb5_kt_cursor kt_cursor;
 131         krb5_keytab_entry kt_entry;
 132         char *valid_princ_formats[7] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL };
 133         char *entry_princ_s = NULL;
 134         fstring my_name, my_fqdn;
 135         int i;
 136         int number_matched_principals = 0;
 137         krb5_data packet;
 138
 139         *pp_tkt = NULL;
 140         *keyblock = NULL;
 141         *perr = 0;
 142
 143         /* Generate the list of principal names which we expect
 144          * clients might want to use for authenticating to the file
 145          * service.  We allow name$,{host,cifs}/{name,fqdn,name.REALM}. */
 146
 147         fstrcpy(my_name, global_myname());
 148
 149         my_fqdn[0] = '\0';
 150         name_to_fqdn(my_fqdn, global_myname());
 151
 152         if (asprintf(&valid_princ_formats[0], "%s$@%s", my_name, lp_realm()) == -1) {
 153                 goto out;
 154         }
 155         if (asprintf(&valid_princ_formats[1], "host/%s@%s", my_name, lp_realm()) == -1) {
 156                 goto out;
 157         }
 158         if (asprintf(&valid_princ_formats[2], "host/%s@%s", my_fqdn, lp_realm()) == -1) {
 159                 goto out;
 160         }
 161         if (asprintf(&valid_princ_formats[3], "host/%s.%s@%s", my_name, lp_realm(), lp_realm()) == -1) {
 162                 goto out;
 163         }
 164         if (asprintf(&valid_princ_formats[4], "cifs/%s@%s", my_name, lp_realm()) == -1) {
 165                 goto out;
 166         }
 167         if (asprintf(&valid_princ_formats[5], "cifs/%s@%s", my_fqdn, lp_realm()) == -1) {
 168                 goto out;
 169         }
 170         if (asprintf(&valid_princ_formats[6], "cifs/%s.%s@%s", my_name, lp_realm(), lp_realm()) == -1) {
 171                 goto out;
 172         }
 173
 174         ZERO_STRUCT(kt_entry);
 175         ZERO_STRUCT(kt_cursor);
 176
 177         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
 178         if (ret) {
 179                 DEBUG(1, ("ads_keytab_verify_ticket: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 180                 goto out;
 181         }
 182
 183         /* Iterate through the keytab.  For each key, if the principal
 184          * name case-insensitively matches one of the allowed formats,
 185          * try verifying the ticket using that principal. */
 186
 187         ret = krb5_kt_start_seq_get(context, keytab, &kt_cursor);
 188         if (ret) {
 189                 DEBUG(1, ("ads_keytab_verify_ticket: krb5_kt_start_seq_get failed (%s)\n", error_message(ret)));
 190                 goto out;
 191         }
 192
 193         while (!auth_ok && (krb5_kt_next_entry(context, keytab, &kt_entry, &kt_cursor) == 0)) {
 194                 ret = smb_krb5_unparse_name(context, kt_entry.principal, &entry_princ_s);
 195                 if (ret) {
 196                         DEBUG(1, ("ads_keytab_verify_ticket: smb_krb5_unparse_name failed (%s)\n",
 197                                 error_message(ret)));
 198                         goto out;
 199                 }
 200
 201                 for (i = 0; i < ARRAY_SIZE(valid_princ_formats); i++) {
 202
 203                         if (!strequal(entry_princ_s, valid_princ_formats[i])) {
 204                                 continue;
 205                         }
 206
 207                         number_matched_principals++;
 208                         packet.length = ticket->length;
 209                         packet.data = (char *)ticket->data;
 210                         *pp_tkt = NULL;
 211
 212                         ret = krb5_rd_req_return_keyblock_from_keytab(context, &auth_context, &packet,
 213                                                                       kt_entry.principal, keytab,
 214                                                                       NULL, pp_tkt, keyblock);
 215
 216                         if (ret) {
 217                                 DEBUG(10,("ads_keytab_verify_ticket: "
 218                                         "krb5_rd_req_return_keyblock_from_keytab(%s) failed: %s\n",
 219                                         entry_princ_s, error_message(ret)));
 220
 221                                 /* workaround for MIT:
 222                                 * as krb5_ktfile_get_entry will explicitly
 223                                 * close the krb5_keytab as soon as krb5_rd_req
 224                                 * has successfully decrypted the ticket but the
 225                                 * ticket is not valid yet (due to clockskew)
 226                                 * there is no point in querying more keytab
 227                                 * entries - Guenther */
 228
 229                                 if (ret == KRB5KRB_AP_ERR_TKT_NYV ||
 230                                     ret == KRB5KRB_AP_ERR_TKT_EXPIRED ||
 231                                     ret == KRB5KRB_AP_ERR_SKEW) {
 232                                         break;
 233                                 }
 234                         } else {
 235                                 DEBUG(3,("ads_keytab_verify_ticket: "
 236                                         "krb5_rd_req_return_keyblock_from_keytab succeeded for principal %s\n",
 237                                         entry_princ_s));
 238                                 auth_ok = True;
 239                                 break;
 240                         }
 241                 }
 242
 243                 /* Free the name we parsed. */
 244                 SAFE_FREE(entry_princ_s);
 245
 246                 /* Free the entry we just read. */
 247                 smb_krb5_kt_free_entry(context, &kt_entry);
 248                 ZERO_STRUCT(kt_entry);
 249         }
 250         krb5_kt_end_seq_get(context, keytab, &kt_cursor);
 251
 252         ZERO_STRUCT(kt_cursor);
 253
 254   out:
 255
 256         for (i = 0; i < ARRAY_SIZE(valid_princ_formats); i++) {
 257                 SAFE_FREE(valid_princ_formats[i]);
 258         }
 259
 260         if (!auth_ok) {
 261                 if (!number_matched_principals) {
 262                         DEBUG(3, ("ads_keytab_verify_ticket: no keytab principals matched expected file service name.\n"));
 263                 } else {
 264                         DEBUG(3, ("ads_keytab_verify_ticket: krb5_rd_req failed for all %d matched keytab principals\n",
 265                                 number_matched_principals));
 266                 }
 267         }
 268
 269         SAFE_FREE(entry_princ_s);
 270
 271         {
 272                 krb5_keytab_entry zero_kt_entry;
 273                 ZERO_STRUCT(zero_kt_entry);
 274                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 275                         smb_krb5_kt_free_entry(context, &kt_entry);
 276                 }
 277         }
 278
 279         {
 280                 krb5_kt_cursor zero_csr;
 281                 ZERO_STRUCT(zero_csr);
 282                 if ((memcmp(&kt_cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 283                         krb5_kt_end_seq_get(context, keytab, &kt_cursor);
 284                 }
 285         }
 286
 287         if (keytab) {
 288                 krb5_kt_close(context, keytab);
 289         }
 290         *perr = ret;
 291         return auth_ok;
 292 }
 293
 294 /**********************************************************************************
 295  Try to verify a ticket using the secrets.tdb.
 296 ***********************************************************************************/
 297
 298 static krb5_error_code ads_secrets_verify_ticket(krb5_context context,
 299                                                 krb5_auth_context auth_context,
 300                                                 krb5_principal host_princ,
 301                                                 const DATA_BLOB *ticket,
 302                                                 krb5_ticket **pp_tkt,
 303                                                 krb5_keyblock **keyblock,
 304                                                 krb5_error_code *perr)
 305 {
 306         krb5_error_code ret = 0;
 307         bool auth_ok = False;
 308         char *password_s = NULL;
 309         krb5_data password;
 310         krb5_enctype enctypes[] = {
 311 #if defined(ENCTYPE_ARCFOUR_HMAC)
 312                 ENCTYPE_ARCFOUR_HMAC,
 313 #endif
 314                 ENCTYPE_DES_CBC_CRC,
 315                 ENCTYPE_DES_CBC_MD5,
 316                 ENCTYPE_NULL
 317         };
 318         krb5_data packet;
 319         int i;
 320
 321         *pp_tkt = NULL;
 322         *keyblock = NULL;
 323         *perr = 0;
 324
 325
 326         if (!secrets_init()) {
 327                 DEBUG(1,("ads_secrets_verify_ticket: secrets_init failed\n"));
 328                 *perr = KRB5_CONFIG_CANTOPEN;
 329                 return False;
 330         }
 331
 332         password_s = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
 333         if (!password_s) {
 334                 DEBUG(1,("ads_secrets_verify_ticket: failed to fetch machine password\n"));
 335                 *perr = KRB5_LIBOS_CANTREADPWD;
 336                 return False;
 337         }
 338
 339         password.data = password_s;
 340         password.length = strlen(password_s);
 341
 342         /* CIFS doesn't use addresses in tickets. This would break NAT. JRA */
 343
 344         packet.length = ticket->length;
 345         packet.data = (char *)ticket->data;
 346
 347         /* We need to setup a auth context with each possible encoding type in turn. */
 348         for (i=0;enctypes[i];i++) {
 349                 krb5_keyblock *key = NULL;
 350
 351                 if (!(key = SMB_MALLOC_P(krb5_keyblock))) {
 352                         ret = ENOMEM;
 353                         goto out;
 354                 }
 355
 356                 if (create_kerberos_key_from_string(context, host_princ, &password, key, enctypes[i], false)) {
 357                         SAFE_FREE(key);
 358                         continue;
 359                 }
 360
 361                 krb5_auth_con_setuseruserkey(context, auth_context, key);
 362
 363                 if (!(ret = krb5_rd_req(context, &auth_context, &packet,
 364                                         NULL,
 365                                         NULL, NULL, pp_tkt))) {
 366                         DEBUG(10,("ads_secrets_verify_ticket: enc type [%u] decrypted message !\n",
 367                                 (unsigned int)enctypes[i] ));
 368                         auth_ok = True;
 369                         krb5_copy_keyblock(context, key, keyblock);
 370                         krb5_free_keyblock(context, key);
 371                         break;
 372                 }
 373
 374                 DEBUG((ret != KRB5_BAD_ENCTYPE) ? 3 : 10,
 375                                 ("ads_secrets_verify_ticket: enc type [%u] failed to decrypt with error %s\n",
 376                                 (unsigned int)enctypes[i], error_message(ret)));
 377
 378                 /* successfully decrypted but ticket is just not valid at the moment */
 379                 if (ret == KRB5KRB_AP_ERR_TKT_NYV ||
 380                     ret == KRB5KRB_AP_ERR_TKT_EXPIRED ||
 381                     ret == KRB5KRB_AP_ERR_SKEW) {
 382                         krb5_free_keyblock(context, key);
 383                         break;
 384                 }
 385
 386                 krb5_free_keyblock(context, key);
 387
 388         }
 389
 390  out:
 391         SAFE_FREE(password_s);
 392         *perr = ret;
 393         return auth_ok;
 394 }
 395
 396 /**********************************************************************************
 397  Verify an incoming ticket and parse out the principal name and
 398  authorization_data if available.
 399 ***********************************************************************************/
 400
 401 NTSTATUS ads_verify_ticket(TALLOC_CTX *mem_ctx,
 402                            const char *realm,
 403                            time_t time_offset,
 404                            const DATA_BLOB *ticket,
 405                            char **principal,
 406                            struct PAC_DATA **pac_data,
 407                            DATA_BLOB *ap_rep,
 408                            DATA_BLOB *session_key,
 409                            bool use_replay_cache)
 410 {
 411         NTSTATUS sret = NT_STATUS_LOGON_FAILURE;
 412         NTSTATUS pac_ret;
 413         DATA_BLOB auth_data;
 414         krb5_context context = NULL;
 415         krb5_auth_context auth_context = NULL;
 416         krb5_data packet;
 417         krb5_ticket *tkt = NULL;
 418         krb5_rcache rcache = NULL;
 419         krb5_keyblock *keyblock = NULL;
 420         time_t authtime;
 421         krb5_error_code ret = 0;
 422         int flags = 0;
 423         krb5_principal host_princ = NULL;
 424         krb5_const_principal client_principal = NULL;
 425         char *host_princ_s = NULL;
 426         bool auth_ok = False;
 427         bool got_auth_data = False;
 428         struct named_mutex *mutex = NULL;
 429
 430         ZERO_STRUCT(packet);
 431         ZERO_STRUCT(auth_data);
 432
 433         *principal = NULL;
 434         *pac_data = NULL;
 435         *ap_rep = data_blob_null;
 436         *session_key = data_blob_null;
 437
 438         initialize_krb5_error_table();
 439         ret = krb5_init_context(&context);
 440         if (ret) {
 441                 DEBUG(1,("ads_verify_ticket: krb5_init_context failed (%s)\n", error_message(ret)));
 442                 return NT_STATUS_LOGON_FAILURE;
 443         }
 444
 445         if (time_offset != 0) {
 446                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 447         }
 448
 449         ret = krb5_set_default_realm(context, realm);
 450         if (ret) {
 451                 DEBUG(1,("ads_verify_ticket: krb5_set_default_realm failed (%s)\n", error_message(ret)));
 452                 goto out;
 453         }
 454
 455         /* This whole process is far more complex than I would
 456            like. We have to go through all this to allow us to store
 457            the secret internally, instead of using /etc/krb5.keytab */
 458
 459         ret = krb5_auth_con_init(context, &auth_context);
 460         if (ret) {
 461                 DEBUG(1,("ads_verify_ticket: krb5_auth_con_init failed (%s)\n", error_message(ret)));
 462                 goto out;
 463         }
 464
 465         krb5_auth_con_getflags( context, auth_context, &flags );
 466         if ( !use_replay_cache ) {
 467                 /* Disable default use of a replay cache */
 468                 flags &= ~KRB5_AUTH_CONTEXT_DO_TIME;
 469                 krb5_auth_con_setflags( context, auth_context, flags );
 470         }
 471
 472         if (asprintf(&host_princ_s, "%s$", global_myname()) == -1) {
 473                 goto out;
 474         }
 475
 476         strlower_m(host_princ_s);
 477         ret = smb_krb5_parse_name(context, host_princ_s, &host_princ);
 478         if (ret) {
 479                 DEBUG(1,("ads_verify_ticket: smb_krb5_parse_name(%s) failed (%s)\n",
 480                                         host_princ_s, error_message(ret)));
 481                 goto out;
 482         }
 483
 484
 485         if ( use_replay_cache ) {
 486
 487                 /* Lock a mutex surrounding the replay as there is no
 488                    locking in the MIT krb5 code surrounding the replay
 489                    cache... */
 490
 491                 mutex = grab_named_mutex(talloc_tos(), "replay cache mutex",
 492                                          10);
 493                 if (mutex == NULL) {
 494                         DEBUG(1,("ads_verify_ticket: unable to protect "
 495                                  "replay cache with mutex.\n"));
 496                         ret = KRB5_CC_IO;
 497                         goto out;
 498                 }
 499
 500                 /* JRA. We must set the rcache here. This will prevent
 501                    replay attacks. */
 502
 503                 ret = krb5_get_server_rcache(context,
 504                                              krb5_princ_component(context, host_princ, 0),
 505                                              &rcache);
 506                 if (ret) {
 507                         DEBUG(1,("ads_verify_ticket: krb5_get_server_rcache "
 508                                  "failed (%s)\n", error_message(ret)));
 509                         goto out;
 510                 }
 511
 512                 ret = krb5_auth_con_setrcache(context, auth_context, rcache);
 513                 if (ret) {
 514                         DEBUG(1,("ads_verify_ticket: krb5_auth_con_setrcache "
 515                                  "failed (%s)\n", error_message(ret)));
 516                         goto out;
 517                 }
 518         }
 519
 520         switch (lp_kerberos_method()) {
 521         default:
 522         case KERBEROS_VERIFY_SECRETS:
 523                 auth_ok = ads_secrets_verify_ticket(context, auth_context,
 524                     host_princ, ticket, &tkt, &keyblock, &ret);
 525                 break;
 526         case KERBEROS_VERIFY_SYSTEM_KEYTAB:
 527                 auth_ok = ads_keytab_verify_ticket(context, auth_context,
 528                     ticket, &tkt, &keyblock, &ret);
 529                 break;
 530         case KERBEROS_VERIFY_DEDICATED_KEYTAB:
 531                 auth_ok = ads_dedicated_keytab_verify_ticket(context,
 532                     auth_context, ticket, &tkt, &keyblock, &ret);
 533                 break;
 534         case KERBEROS_VERIFY_SECRETS_AND_KEYTAB:
 535                 /* First try secrets.tdb and fallback to the krb5.keytab if
 536                    necessary.  This is the pre 3.4 behavior when
 537                    "use kerberos keytab" was true.*/
 538                 auth_ok = ads_secrets_verify_ticket(context, auth_context,
 539                     host_princ, ticket, &tkt, &keyblock, &ret);
 540
 541                 if (!auth_ok) {
 542                         /* Only fallback if we failed to decrypt the ticket */
 543                         if (ret != KRB5KRB_AP_ERR_TKT_NYV &&
 544                             ret != KRB5KRB_AP_ERR_TKT_EXPIRED &&
 545                             ret != KRB5KRB_AP_ERR_SKEW) {
 546                                 auth_ok = ads_keytab_verify_ticket(context,
 547                                     auth_context, ticket, &tkt, &keyblock,
 548                                     &ret);
 549                         }
 550                 }
 551                 break;
 552         }
 553
 554         if ( use_replay_cache ) {
 555                 TALLOC_FREE(mutex);
 556 #if 0
 557                 /* Heimdal leaks here, if we fix the leak, MIT crashes */
 558                 if (rcache) {
 559                         krb5_rc_close(context, rcache);
 560                 }
 561 #endif
 562         }
 563
 564         if (!auth_ok) {
 565                 DEBUG(3,("ads_verify_ticket: krb5_rd_req with auth failed (%s)\n",
 566                          error_message(ret)));
 567                 /* Try map the error return in case it's something like
 568                  * a clock skew error.
 569                  */
 570                 sret = krb5_to_nt_status(ret);
 571                 if (NT_STATUS_IS_OK(sret) || NT_STATUS_EQUAL(sret,NT_STATUS_UNSUCCESSFUL)) {
 572                         sret = NT_STATUS_LOGON_FAILURE;
 573                 }
 574                 DEBUG(10,("ads_verify_ticket: returning error %s\n",
 575                         nt_errstr(sret) ));
 576                 goto out;
 577         }
 578
 579         authtime = get_authtime_from_tkt(tkt);
 580         client_principal = get_principal_from_tkt(tkt);
 581
 582         ret = krb5_mk_rep(context, auth_context, &packet);
 583         if (ret) {
 584                 DEBUG(3,("ads_verify_ticket: Failed to generate mutual authentication reply (%s)\n",
 585                         error_message(ret)));
 586                 goto out;
 587         }
 588
 589         *ap_rep = data_blob(packet.data, packet.length);
 590         if (packet.data) {
 591                 kerberos_free_data_contents(context, &packet);
 592                 ZERO_STRUCT(packet);
 593         }
 594
 595         get_krb5_smb_session_key(context, auth_context, session_key, True);
 596         dump_data_pw("SMB session key (from ticket)\n", session_key->data, session_key->length);
 597
 598 #if 0
 599         file_save("/tmp/ticket.dat", ticket->data, ticket->length);
 600 #endif
 601
 602         /* continue when no PAC is retrieved or we couldn't decode the PAC
 603            (like accounts that have the UF_NO_AUTH_DATA_REQUIRED flag set, or
 604            Kerberos tickets encrypted using a DES key) - Guenther */
 605
 606         got_auth_data = get_auth_data_from_tkt(mem_ctx, &auth_data, tkt);
 607         if (!got_auth_data) {
 608                 DEBUG(3,("ads_verify_ticket: did not retrieve auth data. continuing without PAC\n"));
 609         }
 610
 611         if (got_auth_data) {
 612                 pac_ret = decode_pac_data(mem_ctx, &auth_data, context, keyblock, client_principal, authtime, pac_data);
 613                 if (!NT_STATUS_IS_OK(pac_ret)) {
 614                         DEBUG(3,("ads_verify_ticket: failed to decode PAC_DATA: %s\n", nt_errstr(pac_ret)));
 615                         *pac_data = NULL;
 616                 }
 617                 data_blob_free(&auth_data);
 618         }
 619
 620 #if 0
 621 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 622         /* MIT */
 623         if (tkt->enc_part2) {
 624                 file_save("/tmp/authdata.dat",
 625                           tkt->enc_part2->authorization_data[0]->contents,
 626                           tkt->enc_part2->authorization_data[0]->length);
 627         }
 628 #else
 629         /* Heimdal */
 630         if (tkt->ticket.authorization_data) {
 631                 file_save("/tmp/authdata.dat",
 632                           tkt->ticket.authorization_data->val->ad_data.data,
 633                           tkt->ticket.authorization_data->val->ad_data.length);
 634         }
 635 #endif
 636 #endif
 637
 638         if ((ret = smb_krb5_unparse_name(context, client_principal, principal))) {
 639                 DEBUG(3,("ads_verify_ticket: smb_krb5_unparse_name failed (%s)\n",
 640                          error_message(ret)));
 641                 sret = NT_STATUS_LOGON_FAILURE;
 642                 goto out;
 643         }
 644
 645         sret = NT_STATUS_OK;
 646
 647  out:
 648
 649         TALLOC_FREE(mutex);
 650
 651         if (!NT_STATUS_IS_OK(sret)) {
 652                 data_blob_free(&auth_data);
 653         }
 654
 655         if (!NT_STATUS_IS_OK(sret)) {
 656                 data_blob_free(ap_rep);
 657         }
 658
 659         if (host_princ) {
 660                 krb5_free_principal(context, host_princ);
 661         }
 662
 663         if (keyblock) {
 664                 krb5_free_keyblock(context, keyblock);
 665         }
 666
 667         if (tkt != NULL) {
 668                 krb5_free_ticket(context, tkt);
 669         }
 670
 671         SAFE_FREE(host_princ_s);
 672
 673         if (auth_context) {
 674                 krb5_auth_con_free(context, auth_context);
 675         }
 676
 677         if (context) {
 678                 krb5_free_context(context);
 679         }
 680
 681         return sret;
 682 }
 683
 684 #endif /* HAVE_KRB5 */