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 #include "smb_krb5.h"
  28
  29 #ifdef HAVE_KRB5
  30
  31 #if !defined(HAVE_KRB5_PRINC_COMPONENT)
  32 const krb5_data *krb5_princ_component(krb5_context, krb5_principal, int );
  33 #endif
  34
  35 static bool ads_dedicated_keytab_verify_ticket(krb5_context context,
  36                                           krb5_auth_context auth_context,
  37                                           const DATA_BLOB *ticket,
  38                                           krb5_ticket **pp_tkt,
  39                                           krb5_keyblock **keyblock,
  40                                           krb5_error_code *perr)
  41 {
  42         krb5_error_code ret = 0;
  43         bool auth_ok = false;
  44         krb5_keytab keytab = NULL;
  45         krb5_keytab_entry kt_entry;
  46         krb5_ticket *dec_ticket = NULL;
  47
  48         krb5_data packet;
  49         krb5_kvno kvno = 0;
  50         krb5_enctype enctype;
  51
  52         *pp_tkt = NULL;
  53         *keyblock = NULL;
  54         *perr = 0;
  55
  56         ZERO_STRUCT(kt_entry);
  57
  58         ret = smb_krb5_open_keytab(context, lp_dedicated_keytab_file(), true,
  59             &keytab);
  60         if (ret) {
  61                 DEBUG(1, ("smb_krb5_open_keytab failed (%s)\n",
  62                         error_message(ret)));
  63                 goto out;
  64         }
  65
  66         packet.length = ticket->length;
  67         packet.data = (char *)ticket->data;
  68
  69         ret = krb5_rd_req(context, &auth_context, &packet, NULL, keytab,
  70             NULL, &dec_ticket);
  71         if (ret) {
  72                 DEBUG(0, ("krb5_rd_req failed (%s)\n", error_message(ret)));
  73                 goto out;
  74         }
  75
  76 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
  77         enctype = dec_ticket->ticket.key.keytype;
  78 #else /* MIT */
  79         enctype = dec_ticket->enc_part.enctype;
  80         kvno    = dec_ticket->enc_part.kvno;
  81 #endif
  82
  83         /* Get the key for checking the pac signature */
  84         ret = krb5_kt_get_entry(context, keytab, dec_ticket->server,
  85                                 kvno, enctype, &kt_entry);
  86         if (ret) {
  87                 DEBUG(0, ("krb5_kt_get_entry failed (%s)\n",
  88                           error_message(ret)));
  89                 goto out;
  90         }
  91
  92         ret = krb5_copy_keyblock(context, KRB5_KT_KEY(&kt_entry), keyblock);
  93         smb_krb5_kt_free_entry(context, &kt_entry);
  94
  95         if (ret) {
  96                 DEBUG(0, ("failed to copy key: %s\n",
  97                           error_message(ret)));
  98                 goto out;
  99         }
 100
 101         auth_ok = true;
 102         *pp_tkt = dec_ticket;
 103         dec_ticket = NULL;
 104
 105   out:
 106         if (dec_ticket)
 107                 krb5_free_ticket(context, dec_ticket);
 108
 109         if (keytab)
 110                 krb5_kt_close(context, keytab);
 111
 112         *perr = ret;
 113         return auth_ok;
 114 }
 115
 116 /**********************************************************************************
 117  Try to verify a ticket using the system keytab... the system keytab has kvno -1 entries, so
 118  it's more like what microsoft does... see comment in utils/net_ads.c in the
 119  ads_keytab_add_entry function for details.
 120 ***********************************************************************************/
 121
 122 static bool ads_keytab_verify_ticket(krb5_context context,
 123                                         krb5_auth_context auth_context,
 124                                         const DATA_BLOB *ticket,
 125                                         krb5_ticket **pp_tkt,
 126                                         krb5_keyblock **keyblock,
 127                                         krb5_error_code *perr)
 128 {
 129         krb5_error_code ret = 0;
 130         bool auth_ok = False;
 131         krb5_keytab keytab = NULL;
 132         krb5_kt_cursor kt_cursor;
 133         krb5_keytab_entry kt_entry;
 134         char *valid_princ_formats[7] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL };
 135         char *entry_princ_s = NULL;
 136         fstring my_name, my_fqdn;
 137         int i;
 138         int number_matched_principals = 0;
 139         krb5_data packet;
 140
 141         *pp_tkt = NULL;
 142         *keyblock = NULL;
 143         *perr = 0;
 144
 145         /* Generate the list of principal names which we expect
 146          * clients might want to use for authenticating to the file
 147          * service.  We allow name$,{host,cifs}/{name,fqdn,name.REALM}. */
 148
 149         fstrcpy(my_name, global_myname());
 150
 151         my_fqdn[0] = '\0';
 152         name_to_fqdn(my_fqdn, global_myname());
 153
 154         if (asprintf(&valid_princ_formats[0], "%s$@%s", my_name, lp_realm()) == -1) {
 155                 goto out;
 156         }
 157         if (asprintf(&valid_princ_formats[1], "host/%s@%s", my_name, lp_realm()) == -1) {
 158                 goto out;
 159         }
 160         if (asprintf(&valid_princ_formats[2], "host/%s@%s", my_fqdn, lp_realm()) == -1) {
 161                 goto out;
 162         }
 163         if (asprintf(&valid_princ_formats[3], "host/%s.%s@%s", my_name, lp_realm(), lp_realm()) == -1) {
 164                 goto out;
 165         }
 166         if (asprintf(&valid_princ_formats[4], "cifs/%s@%s", my_name, lp_realm()) == -1) {
 167                 goto out;
 168         }
 169         if (asprintf(&valid_princ_formats[5], "cifs/%s@%s", my_fqdn, lp_realm()) == -1) {
 170                 goto out;
 171         }
 172         if (asprintf(&valid_princ_formats[6], "cifs/%s.%s@%s", my_name, lp_realm(), lp_realm()) == -1) {
 173                 goto out;
 174         }
 175
 176         ZERO_STRUCT(kt_entry);
 177         ZERO_STRUCT(kt_cursor);
 178
 179         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
 180         if (ret) {
 181                 DEBUG(1, ("ads_keytab_verify_ticket: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 182                 goto out;
 183         }
 184
 185         /* Iterate through the keytab.  For each key, if the principal
 186          * name case-insensitively matches one of the allowed formats,
 187          * try verifying the ticket using that principal. */
 188
 189         ret = krb5_kt_start_seq_get(context, keytab, &kt_cursor);
 190         if (ret) {
 191                 DEBUG(1, ("ads_keytab_verify_ticket: krb5_kt_start_seq_get failed (%s)\n", error_message(ret)));
 192                 goto out;
 193         }
 194
 195         while (!auth_ok && (krb5_kt_next_entry(context, keytab, &kt_entry, &kt_cursor) == 0)) {
 196                 ret = smb_krb5_unparse_name(talloc_tos(), context, kt_entry.principal, &entry_princ_s);
 197                 if (ret) {
 198                         DEBUG(1, ("ads_keytab_verify_ticket: smb_krb5_unparse_name failed (%s)\n",
 199                                 error_message(ret)));
 200                         goto out;
 201                 }
 202
 203                 for (i = 0; i < ARRAY_SIZE(valid_princ_formats); i++) {
 204
 205                         if (!strequal(entry_princ_s, valid_princ_formats[i])) {
 206                                 continue;
 207                         }
 208
 209                         number_matched_principals++;
 210                         packet.length = ticket->length;
 211                         packet.data = (char *)ticket->data;
 212                         *pp_tkt = NULL;
 213
 214                         ret = krb5_rd_req_return_keyblock_from_keytab(context, &auth_context, &packet,
 215                                                                       kt_entry.principal, keytab,
 216                                                                       NULL, pp_tkt, keyblock);
 217
 218                         if (ret) {
 219                                 DEBUG(10,("ads_keytab_verify_ticket: "
 220                                         "krb5_rd_req_return_keyblock_from_keytab(%s) failed: %s\n",
 221                                         entry_princ_s, error_message(ret)));
 222
 223                                 /* workaround for MIT:
 224                                 * as krb5_ktfile_get_entry will explicitly
 225                                 * close the krb5_keytab as soon as krb5_rd_req
 226                                 * has successfully decrypted the ticket but the
 227                                 * ticket is not valid yet (due to clockskew)
 228                                 * there is no point in querying more keytab
 229                                 * entries - Guenther */
 230
 231                                 if (ret == KRB5KRB_AP_ERR_TKT_NYV ||
 232                                     ret == KRB5KRB_AP_ERR_TKT_EXPIRED ||
 233                                     ret == KRB5KRB_AP_ERR_SKEW) {
 234                                         break;
 235                                 }
 236                         } else {
 237                                 DEBUG(3,("ads_keytab_verify_ticket: "
 238                                         "krb5_rd_req_return_keyblock_from_keytab succeeded for principal %s\n",
 239                                         entry_princ_s));
 240                                 auth_ok = True;
 241                                 break;
 242                         }
 243                 }
 244
 245                 /* Free the name we parsed. */
 246                 TALLOC_FREE(entry_princ_s);
 247
 248                 /* Free the entry we just read. */
 249                 smb_krb5_kt_free_entry(context, &kt_entry);
 250                 ZERO_STRUCT(kt_entry);
 251         }
 252         krb5_kt_end_seq_get(context, keytab, &kt_cursor);
 253
 254         ZERO_STRUCT(kt_cursor);
 255
 256   out:
 257
 258         for (i = 0; i < ARRAY_SIZE(valid_princ_formats); i++) {
 259                 SAFE_FREE(valid_princ_formats[i]);
 260         }
 261
 262         if (!auth_ok) {
 263                 if (!number_matched_principals) {
 264                         DEBUG(3, ("ads_keytab_verify_ticket: no keytab principals matched expected file service name.\n"));
 265                 } else {
 266                         DEBUG(3, ("ads_keytab_verify_ticket: krb5_rd_req failed for all %d matched keytab principals\n",
 267                                 number_matched_principals));
 268                 }
 269         }
 270
 271         SAFE_FREE(entry_princ_s);
 272
 273         {
 274                 krb5_keytab_entry zero_kt_entry;
 275                 ZERO_STRUCT(zero_kt_entry);
 276                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 277                         smb_krb5_kt_free_entry(context, &kt_entry);
 278                 }
 279         }
 280
 281         {
 282                 krb5_kt_cursor zero_csr;
 283                 ZERO_STRUCT(zero_csr);
 284                 if ((memcmp(&kt_cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 285                         krb5_kt_end_seq_get(context, keytab, &kt_cursor);
 286                 }
 287         }
 288
 289         if (keytab) {
 290                 krb5_kt_close(context, keytab);
 291         }
 292         *perr = ret;
 293         return auth_ok;
 294 }
 295
 296 /**********************************************************************************
 297  Try to verify a ticket using the secrets.tdb.
 298 ***********************************************************************************/
 299
 300 static krb5_error_code ads_secrets_verify_ticket(krb5_context context,
 301                                                 krb5_auth_context auth_context,
 302                                                 krb5_principal host_princ,
 303                                                 const DATA_BLOB *ticket,
 304                                                 krb5_ticket **pp_tkt,
 305                                                 krb5_keyblock **keyblock,
 306                                                 krb5_error_code *perr)
 307 {
 308         krb5_error_code ret = 0;
 309         bool auth_ok = False;
 310         bool cont = true;
 311         char *password_s = NULL;
 312         /* Let's make some room for 2 password (old and new)*/
 313         krb5_data passwords[2];
 314         krb5_enctype enctypes[] = {
 315 #if defined(ENCTYPE_ARCFOUR_HMAC)
 316                 ENCTYPE_ARCFOUR_HMAC,
 317 #endif
 318                 ENCTYPE_DES_CBC_CRC,
 319                 ENCTYPE_DES_CBC_MD5,
 320                 ENCTYPE_NULL
 321         };
 322         krb5_data packet;
 323         int i, j;
 324
 325         *pp_tkt = NULL;
 326         *keyblock = NULL;
 327         *perr = 0;
 328
 329         ZERO_STRUCT(passwords);
 330
 331         if (!secrets_init()) {
 332                 DEBUG(1,("ads_secrets_verify_ticket: secrets_init failed\n"));
 333                 *perr = KRB5_CONFIG_CANTOPEN;
 334                 return False;
 335         }
 336
 337         password_s = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
 338         if (!password_s) {
 339                 DEBUG(1,("ads_secrets_verify_ticket: failed to fetch machine password\n"));
 340                 *perr = KRB5_LIBOS_CANTREADPWD;
 341                 return False;
 342         }
 343
 344         passwords[0].data = password_s;
 345         passwords[0].length = strlen(password_s);
 346
 347         password_s = secrets_fetch_prev_machine_password(lp_workgroup());
 348         if (password_s) {
 349                 DEBUG(10,("ads_secrets_verify_ticket: found previous password\n"));
 350                 passwords[1].data = password_s;
 351                 passwords[1].length = strlen(password_s);
 352         }
 353
 354         /* CIFS doesn't use addresses in tickets. This would break NAT. JRA */
 355
 356         packet.length = ticket->length;
 357         packet.data = (char *)ticket->data;
 358
 359         /* We need to setup a auth context with each possible encoding type in turn. */
 360         for (j=0; j<2 && passwords[j].length; j++) {
 361
 362                 for (i=0;enctypes[i];i++) {
 363                         krb5_keyblock *key = NULL;
 364
 365                         if (!(key = SMB_MALLOC_P(krb5_keyblock))) {
 366                                 ret = ENOMEM;
 367                                 goto out;
 368                         }
 369
 370                         if (create_kerberos_key_from_string(context, host_princ, &passwords[j], key, enctypes[i], false)) {
 371                                 SAFE_FREE(key);
 372                                 continue;
 373                         }
 374
 375                         krb5_auth_con_setuseruserkey(context, auth_context, key);
 376
 377                         if (!(ret = krb5_rd_req(context, &auth_context, &packet,
 378                                                 NULL,
 379                                                 NULL, NULL, pp_tkt))) {
 380                                 DEBUG(10,("ads_secrets_verify_ticket: enc type [%u] decrypted message !\n",
 381                                         (unsigned int)enctypes[i] ));
 382                                 auth_ok = True;
 383                                 cont = false;
 384                                 krb5_copy_keyblock(context, key, keyblock);
 385                                 krb5_free_keyblock(context, key);
 386                                 break;
 387                         }
 388
 389                         DEBUG((ret != KRB5_BAD_ENCTYPE) ? 3 : 10,
 390                                         ("ads_secrets_verify_ticket: enc type [%u] failed to decrypt with error %s\n",
 391                                         (unsigned int)enctypes[i], error_message(ret)));
 392
 393                         /* successfully decrypted but ticket is just not valid at the moment */
 394                         if (ret == KRB5KRB_AP_ERR_TKT_NYV ||
 395                             ret == KRB5KRB_AP_ERR_TKT_EXPIRED ||
 396                             ret == KRB5KRB_AP_ERR_SKEW) {
 397                                 krb5_free_keyblock(context, key);
 398                                 cont = false;
 399                                 break;
 400                         }
 401
 402                         krb5_free_keyblock(context, key);
 403                 }
 404                 if (!cont) {
 405                         /* If we found a valid pass then no need to try
 406                          * the next one or we have invalid ticket so no need
 407                          * to try next password*/
 408                         break;
 409                 }
 410         }
 411
 412  out:
 413         SAFE_FREE(passwords[0].data);
 414         SAFE_FREE(passwords[1].data);
 415         *perr = ret;
 416         return auth_ok;
 417 }
 418
 419 /**********************************************************************************
 420  Verify an incoming ticket and parse out the principal name and
 421  authorization_data if available.
 422 ***********************************************************************************/
 423
 424 NTSTATUS ads_verify_ticket(TALLOC_CTX *mem_ctx,
 425                            const char *realm,
 426                            time_t time_offset,
 427                            const DATA_BLOB *ticket,
 428                            char **principal,
 429                            struct PAC_DATA **pac_data,
 430                            DATA_BLOB *ap_rep,
 431                            DATA_BLOB *session_key,
 432                            bool use_replay_cache)
 433 {
 434         NTSTATUS sret = NT_STATUS_LOGON_FAILURE;
 435         NTSTATUS pac_ret;
 436         DATA_BLOB auth_data;
 437         krb5_context context = NULL;
 438         krb5_auth_context auth_context = NULL;
 439         krb5_data packet;
 440         krb5_ticket *tkt = NULL;
 441         krb5_rcache rcache = NULL;
 442         krb5_keyblock *keyblock = NULL;
 443         time_t authtime;
 444         krb5_error_code ret = 0;
 445         int flags = 0;
 446         krb5_principal host_princ = NULL;
 447         krb5_const_principal client_principal = NULL;
 448         char *host_princ_s = NULL;
 449         bool auth_ok = False;
 450         bool got_auth_data = False;
 451         struct named_mutex *mutex = NULL;
 452
 453         ZERO_STRUCT(packet);
 454         ZERO_STRUCT(auth_data);
 455
 456         *principal = NULL;
 457         *pac_data = NULL;
 458         *ap_rep = data_blob_null;
 459         *session_key = data_blob_null;
 460
 461         initialize_krb5_error_table();
 462         ret = krb5_init_context(&context);
 463         if (ret) {
 464                 DEBUG(1,("ads_verify_ticket: krb5_init_context failed (%s)\n", error_message(ret)));
 465                 return NT_STATUS_LOGON_FAILURE;
 466         }
 467
 468         if (time_offset != 0) {
 469                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 470         }
 471
 472         ret = krb5_set_default_realm(context, realm);
 473         if (ret) {
 474                 DEBUG(1,("ads_verify_ticket: krb5_set_default_realm failed (%s)\n", error_message(ret)));
 475                 goto out;
 476         }
 477
 478         /* This whole process is far more complex than I would
 479            like. We have to go through all this to allow us to store
 480            the secret internally, instead of using /etc/krb5.keytab */
 481
 482         ret = krb5_auth_con_init(context, &auth_context);
 483         if (ret) {
 484                 DEBUG(1,("ads_verify_ticket: krb5_auth_con_init failed (%s)\n", error_message(ret)));
 485                 goto out;
 486         }
 487
 488         krb5_auth_con_getflags( context, auth_context, &flags );
 489         if ( !use_replay_cache ) {
 490                 /* Disable default use of a replay cache */
 491                 flags &= ~KRB5_AUTH_CONTEXT_DO_TIME;
 492                 krb5_auth_con_setflags( context, auth_context, flags );
 493         }
 494
 495         if (asprintf(&host_princ_s, "%s$", global_myname()) == -1) {
 496                 goto out;
 497         }
 498
 499         strlower_m(host_princ_s);
 500         ret = smb_krb5_parse_name(context, host_princ_s, &host_princ);
 501         if (ret) {
 502                 DEBUG(1,("ads_verify_ticket: smb_krb5_parse_name(%s) failed (%s)\n",
 503                                         host_princ_s, error_message(ret)));
 504                 goto out;
 505         }
 506
 507
 508         if ( use_replay_cache ) {
 509
 510                 /* Lock a mutex surrounding the replay as there is no
 511                    locking in the MIT krb5 code surrounding the replay
 512                    cache... */
 513
 514                 mutex = grab_named_mutex(talloc_tos(), "replay cache mutex",
 515                                          10);
 516                 if (mutex == NULL) {
 517                         DEBUG(1,("ads_verify_ticket: unable to protect "
 518                                  "replay cache with mutex.\n"));
 519                         ret = KRB5_CC_IO;
 520                         goto out;
 521                 }
 522
 523                 /* JRA. We must set the rcache here. This will prevent
 524                    replay attacks. */
 525
 526                 ret = krb5_get_server_rcache(context,
 527                                              krb5_princ_component(context, host_princ, 0),
 528                                              &rcache);
 529                 if (ret) {
 530                         DEBUG(1,("ads_verify_ticket: krb5_get_server_rcache "
 531                                  "failed (%s)\n", error_message(ret)));
 532                         goto out;
 533                 }
 534
 535                 ret = krb5_auth_con_setrcache(context, auth_context, rcache);
 536                 if (ret) {
 537                         DEBUG(1,("ads_verify_ticket: krb5_auth_con_setrcache "
 538                                  "failed (%s)\n", error_message(ret)));
 539                         goto out;
 540                 }
 541         }
 542
 543         switch (lp_kerberos_method()) {
 544         default:
 545         case KERBEROS_VERIFY_SECRETS:
 546                 auth_ok = ads_secrets_verify_ticket(context, auth_context,
 547                     host_princ, ticket, &tkt, &keyblock, &ret);
 548                 break;
 549         case KERBEROS_VERIFY_SYSTEM_KEYTAB:
 550                 auth_ok = ads_keytab_verify_ticket(context, auth_context,
 551                     ticket, &tkt, &keyblock, &ret);
 552                 break;
 553         case KERBEROS_VERIFY_DEDICATED_KEYTAB:
 554                 auth_ok = ads_dedicated_keytab_verify_ticket(context,
 555                     auth_context, ticket, &tkt, &keyblock, &ret);
 556                 break;
 557         case KERBEROS_VERIFY_SECRETS_AND_KEYTAB:
 558                 /* First try secrets.tdb and fallback to the krb5.keytab if
 559                    necessary.  This is the pre 3.4 behavior when
 560                    "use kerberos keytab" was true.*/
 561                 auth_ok = ads_secrets_verify_ticket(context, auth_context,
 562                     host_princ, ticket, &tkt, &keyblock, &ret);
 563
 564                 if (!auth_ok) {
 565                         /* Only fallback if we failed to decrypt the ticket */
 566                         if (ret != KRB5KRB_AP_ERR_TKT_NYV &&
 567                             ret != KRB5KRB_AP_ERR_TKT_EXPIRED &&
 568                             ret != KRB5KRB_AP_ERR_SKEW) {
 569                                 auth_ok = ads_keytab_verify_ticket(context,
 570                                     auth_context, ticket, &tkt, &keyblock,
 571                                     &ret);
 572                         }
 573                 }
 574                 break;
 575         }
 576
 577         if ( use_replay_cache ) {
 578                 TALLOC_FREE(mutex);
 579 #if 0
 580                 /* Heimdal leaks here, if we fix the leak, MIT crashes */
 581                 if (rcache) {
 582                         krb5_rc_close(context, rcache);
 583                 }
 584 #endif
 585         }
 586
 587         if (!auth_ok) {
 588                 DEBUG(3,("ads_verify_ticket: krb5_rd_req with auth failed (%s)\n",
 589                          error_message(ret)));
 590                 /* Try map the error return in case it's something like
 591                  * a clock skew error.
 592                  */
 593                 sret = krb5_to_nt_status(ret);
 594                 if (NT_STATUS_IS_OK(sret) || NT_STATUS_EQUAL(sret,NT_STATUS_UNSUCCESSFUL)) {
 595                         sret = NT_STATUS_LOGON_FAILURE;
 596                 }
 597                 DEBUG(10,("ads_verify_ticket: returning error %s\n",
 598                         nt_errstr(sret) ));
 599                 goto out;
 600         }
 601
 602         authtime = get_authtime_from_tkt(tkt);
 603         client_principal = get_principal_from_tkt(tkt);
 604
 605         ret = krb5_mk_rep(context, auth_context, &packet);
 606         if (ret) {
 607                 DEBUG(3,("ads_verify_ticket: Failed to generate mutual authentication reply (%s)\n",
 608                         error_message(ret)));
 609                 goto out;
 610         }
 611
 612         *ap_rep = data_blob(packet.data, packet.length);
 613         if (packet.data) {
 614                 kerberos_free_data_contents(context, &packet);
 615                 ZERO_STRUCT(packet);
 616         }
 617
 618         get_krb5_smb_session_key(context, auth_context, session_key, True);
 619         dump_data_pw("SMB session key (from ticket)\n", session_key->data, session_key->length);
 620
 621 #if 0
 622         file_save("/tmp/ticket.dat", ticket->data, ticket->length);
 623 #endif
 624
 625         /* continue when no PAC is retrieved or we couldn't decode the PAC
 626            (like accounts that have the UF_NO_AUTH_DATA_REQUIRED flag set, or
 627            Kerberos tickets encrypted using a DES key) - Guenther */
 628
 629         got_auth_data = get_auth_data_from_tkt(mem_ctx, &auth_data, tkt);
 630         if (!got_auth_data) {
 631                 DEBUG(3,("ads_verify_ticket: did not retrieve auth data. continuing without PAC\n"));
 632         }
 633
 634         if (got_auth_data) {
 635                 pac_ret = decode_pac_data(mem_ctx, &auth_data, context, keyblock, client_principal, authtime, pac_data);
 636                 if (!NT_STATUS_IS_OK(pac_ret)) {
 637                         DEBUG(3,("ads_verify_ticket: failed to decode PAC_DATA: %s\n", nt_errstr(pac_ret)));
 638                         *pac_data = NULL;
 639                 }
 640                 data_blob_free(&auth_data);
 641         }
 642
 643 #if 0
 644 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 645         /* MIT */
 646         if (tkt->enc_part2) {
 647                 file_save("/tmp/authdata.dat",
 648                           tkt->enc_part2->authorization_data[0]->contents,
 649                           tkt->enc_part2->authorization_data[0]->length);
 650         }
 651 #else
 652         /* Heimdal */
 653         if (tkt->ticket.authorization_data) {
 654                 file_save("/tmp/authdata.dat",
 655                           tkt->ticket.authorization_data->val->ad_data.data,
 656                           tkt->ticket.authorization_data->val->ad_data.length);
 657         }
 658 #endif
 659 #endif
 660
 661         if ((ret = smb_krb5_unparse_name(mem_ctx, context, client_principal, principal))) {
 662                 DEBUG(3,("ads_verify_ticket: smb_krb5_unparse_name failed (%s)\n",
 663                          error_message(ret)));
 664                 sret = NT_STATUS_LOGON_FAILURE;
 665                 goto out;
 666         }
 667
 668         sret = NT_STATUS_OK;
 669
 670  out:
 671
 672         TALLOC_FREE(mutex);
 673
 674         if (!NT_STATUS_IS_OK(sret)) {
 675                 data_blob_free(&auth_data);
 676         }
 677
 678         if (!NT_STATUS_IS_OK(sret)) {
 679                 data_blob_free(ap_rep);
 680         }
 681
 682         if (host_princ) {
 683                 krb5_free_principal(context, host_princ);
 684         }
 685
 686         if (keyblock) {
 687                 krb5_free_keyblock(context, keyblock);
 688         }
 689
 690         if (tkt != NULL) {
 691                 krb5_free_ticket(context, tkt);
 692         }
 693
 694         SAFE_FREE(host_princ_s);
 695
 696         if (auth_context) {
 697                 krb5_auth_con_free(context, auth_context);
 698         }
 699
 700         if (context) {
 701                 krb5_free_context(context);
 702         }
 703
 704         return sret;
 705 }
 706
 707 #endif /* HAVE_KRB5 */