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
 118  kvno -1 entries, so it's more like what microsoft does... see comment in
 119  utils/net_ads.c in the 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,
 135                                          NULL, NULL, NULL, NULL };
 136         char *entry_princ_s = NULL;
 137         fstring my_name, my_fqdn;
 138         int i;
 139         int number_matched_principals = 0;
 140         krb5_data packet;
 141         int err;
 142
 143         *pp_tkt = NULL;
 144         *keyblock = NULL;
 145         *perr = 0;
 146
 147         /* Generate the list of principal names which we expect
 148          * clients might want to use for authenticating to the file
 149          * service.  We allow name$,{host,cifs}/{name,fqdn,name.REALM}. */
 150
 151         fstrcpy(my_name, global_myname());
 152
 153         my_fqdn[0] = '\0';
 154         name_to_fqdn(my_fqdn, global_myname());
 155
 156         err = asprintf(&valid_princ_formats[0],
 157                         "%s$@%s", my_name, lp_realm());
 158         if (err == -1) {
 159                 goto out;
 160         }
 161         err = asprintf(&valid_princ_formats[1],
 162                         "host/%s@%s", my_name, lp_realm());
 163         if (err == -1) {
 164                 goto out;
 165         }
 166         err = asprintf(&valid_princ_formats[2],
 167                         "host/%s@%s", my_fqdn, lp_realm());
 168         if (err == -1) {
 169                 goto out;
 170         }
 171         err = asprintf(&valid_princ_formats[3],
 172                         "host/%s.%s@%s", my_name, lp_realm(), lp_realm());
 173         if (err == -1) {
 174                 goto out;
 175         }
 176         err = asprintf(&valid_princ_formats[4],
 177                         "cifs/%s@%s", my_name, lp_realm());
 178         if (err == -1) {
 179                 goto out;
 180         }
 181         err = asprintf(&valid_princ_formats[5],
 182                         "cifs/%s@%s", my_fqdn, lp_realm());
 183         if (err == -1) {
 184                 goto out;
 185         }
 186         err = asprintf(&valid_princ_formats[6],
 187                         "cifs/%s.%s@%s", my_name, lp_realm(), lp_realm());
 188         if (err == -1) {
 189                 goto out;
 190         }
 191
 192         ZERO_STRUCT(kt_entry);
 193         ZERO_STRUCT(kt_cursor);
 194
 195         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
 196         if (ret) {
 197                 DEBUG(1, (__location__ ": smb_krb5_open_keytab failed (%s)\n",
 198                           error_message(ret)));
 199                 goto out;
 200         }
 201
 202         /* Iterate through the keytab.  For each key, if the principal
 203          * name case-insensitively matches one of the allowed formats,
 204          * try verifying the ticket using that principal. */
 205
 206         ret = krb5_kt_start_seq_get(context, keytab, &kt_cursor);
 207         if (ret) {
 208                 DEBUG(1, (__location__ ": krb5_kt_start_seq_get failed (%s)\n",
 209                           error_message(ret)));
 210                 goto out;
 211         }
 212
 213         while (!auth_ok &&
 214                (krb5_kt_next_entry(context, keytab,
 215                                    &kt_entry, &kt_cursor) == 0)) {
 216                 ret = smb_krb5_unparse_name(talloc_tos(), context,
 217                                             kt_entry.principal,
 218                                             &entry_princ_s);
 219                 if (ret) {
 220                         DEBUG(1, (__location__ ": smb_krb5_unparse_name "
 221                                   "failed (%s)\n", error_message(ret)));
 222                         goto out;
 223                 }
 224
 225                 for (i = 0; i < ARRAY_SIZE(valid_princ_formats); i++) {
 226
 227                         if (!strequal(entry_princ_s, valid_princ_formats[i])) {
 228                                 continue;
 229                         }
 230
 231                         number_matched_principals++;
 232                         packet.length = ticket->length;
 233                         packet.data = (char *)ticket->data;
 234                         *pp_tkt = NULL;
 235
 236                         ret = krb5_rd_req_return_keyblock_from_keytab(context,
 237                                                 &auth_context, &packet,
 238                                                 kt_entry.principal, keytab,
 239                                                 NULL, pp_tkt, keyblock);
 240
 241                         if (ret) {
 242                                 DEBUG(10, (__location__ ": krb5_rd_req_return"
 243                                            "_keyblock_from_keytab(%s) "
 244                                            "failed: %s\n", entry_princ_s,
 245                                            error_message(ret)));
 246
 247                                 /* workaround for MIT:
 248                                 * as krb5_ktfile_get_entry will explicitly
 249                                 * close the krb5_keytab as soon as krb5_rd_req
 250                                 * has successfully decrypted the ticket but the
 251                                 * ticket is not valid yet (due to clockskew)
 252                                 * there is no point in querying more keytab
 253                                 * entries - Guenther */
 254
 255                                 if (ret == KRB5KRB_AP_ERR_TKT_NYV ||
 256                                     ret == KRB5KRB_AP_ERR_TKT_EXPIRED ||
 257                                     ret == KRB5KRB_AP_ERR_SKEW) {
 258                                         break;
 259                                 }
 260                         } else {
 261                                 DEBUG(3, (__location__ ": krb5_rd_req_return"
 262                                           "_keyblock_from_keytab succeeded "
 263                                           "for principal %s\n",
 264                                           entry_princ_s));
 265                                 auth_ok = True;
 266                                 break;
 267                         }
 268                 }
 269
 270                 /* Free the name we parsed. */
 271                 TALLOC_FREE(entry_princ_s);
 272
 273                 /* Free the entry we just read. */
 274                 smb_krb5_kt_free_entry(context, &kt_entry);
 275                 ZERO_STRUCT(kt_entry);
 276         }
 277         krb5_kt_end_seq_get(context, keytab, &kt_cursor);
 278
 279         ZERO_STRUCT(kt_cursor);
 280
 281 out:
 282
 283         for (i = 0; i < ARRAY_SIZE(valid_princ_formats); i++) {
 284                 SAFE_FREE(valid_princ_formats[i]);
 285         }
 286
 287         if (!auth_ok) {
 288                 if (!number_matched_principals) {
 289                         DEBUG(3, (__location__ ": no keytab principals "
 290                                   "matched expected file service name.\n"));
 291                 } else {
 292                         DEBUG(3, (__location__ ": krb5_rd_req failed for "
 293                                   "all %d matched keytab principals\n",
 294                                   number_matched_principals));
 295                 }
 296         }
 297
 298         SAFE_FREE(entry_princ_s);
 299
 300         {
 301                 krb5_keytab_entry zero_kt_entry;
 302                 ZERO_STRUCT(zero_kt_entry);
 303                 if (memcmp(&zero_kt_entry, &kt_entry,
 304                            sizeof(krb5_keytab_entry))) {
 305                         smb_krb5_kt_free_entry(context, &kt_entry);
 306                 }
 307         }
 308
 309         {
 310                 krb5_kt_cursor zero_csr;
 311                 ZERO_STRUCT(zero_csr);
 312                 if ((memcmp(&kt_cursor, &zero_csr,
 313                             sizeof(krb5_kt_cursor)) != 0) && keytab) {
 314                         krb5_kt_end_seq_get(context, keytab, &kt_cursor);
 315                 }
 316         }
 317
 318         if (keytab) {
 319                 krb5_kt_close(context, keytab);
 320         }
 321         *perr = ret;
 322         return auth_ok;
 323 }
 324
 325 /*****************************************************************************
 326  Try to verify a ticket using the secrets.tdb.
 327 ******************************************************************************/
 328
 329 static krb5_error_code ads_secrets_verify_ticket(krb5_context context,
 330                                                 krb5_auth_context auth_context,
 331                                                 krb5_principal host_princ,
 332                                                 const DATA_BLOB *ticket,
 333                                                 krb5_ticket **pp_tkt,
 334                                                 krb5_keyblock **keyblock,
 335                                                 krb5_error_code *perr)
 336 {
 337         krb5_error_code ret = 0;
 338         bool auth_ok = False;
 339         bool cont = true;
 340         char *password_s = NULL;
 341         /* Let's make some room for 2 password (old and new)*/
 342         krb5_data passwords[2];
 343         krb5_enctype enctypes[] = {
 344 #if defined(ENCTYPE_ARCFOUR_HMAC)
 345                 ENCTYPE_ARCFOUR_HMAC,
 346 #endif
 347                 ENCTYPE_DES_CBC_CRC,
 348                 ENCTYPE_DES_CBC_MD5,
 349                 ENCTYPE_NULL
 350         };
 351         krb5_data packet;
 352         int i, j;
 353
 354         *pp_tkt = NULL;
 355         *keyblock = NULL;
 356         *perr = 0;
 357
 358         ZERO_STRUCT(passwords);
 359
 360         if (!secrets_init()) {
 361                 DEBUG(1,("ads_secrets_verify_ticket: secrets_init failed\n"));
 362                 *perr = KRB5_CONFIG_CANTOPEN;
 363                 return False;
 364         }
 365
 366         password_s = secrets_fetch_machine_password(lp_workgroup(),
 367                                                     NULL, NULL);
 368         if (!password_s) {
 369                 DEBUG(1,(__location__ ": failed to fetch machine password\n"));
 370                 *perr = KRB5_LIBOS_CANTREADPWD;
 371                 return False;
 372         }
 373
 374         passwords[0].data = password_s;
 375         passwords[0].length = strlen(password_s);
 376
 377         password_s = secrets_fetch_prev_machine_password(lp_workgroup());
 378         if (password_s) {
 379                 DEBUG(10, (__location__ ": found previous password\n"));
 380                 passwords[1].data = password_s;
 381                 passwords[1].length = strlen(password_s);
 382         }
 383
 384         /* CIFS doesn't use addresses in tickets. This would break NAT. JRA */
 385
 386         packet.length = ticket->length;
 387         packet.data = (char *)ticket->data;
 388
 389         /* We need to setup a auth context with each possible encoding type
 390          * in turn. */
 391         for (j=0; j<2 && passwords[j].length; j++) {
 392
 393                 for (i=0;enctypes[i];i++) {
 394                         krb5_keyblock *key = NULL;
 395
 396                         if (!(key = SMB_MALLOC_P(krb5_keyblock))) {
 397                                 ret = ENOMEM;
 398                                 goto out;
 399                         }
 400
 401                         if (create_kerberos_key_from_string(context,
 402                                                 host_princ, &passwords[j],
 403                                                 key, enctypes[i], false)) {
 404                                 SAFE_FREE(key);
 405                                 continue;
 406                         }
 407
 408                         krb5_auth_con_setuseruserkey(context,
 409                                                         auth_context, key);
 410
 411                         if (!(ret = krb5_rd_req(context, &auth_context,
 412                                                 &packet, NULL, NULL,
 413                                                 NULL, pp_tkt))) {
 414                                 DEBUG(10, (__location__ ": enc type [%u] "
 415                                            "decrypted message !\n",
 416                                            (unsigned int)enctypes[i]));
 417                                 auth_ok = True;
 418                                 cont = false;
 419                                 krb5_copy_keyblock(context, key, keyblock);
 420                                 krb5_free_keyblock(context, key);
 421                                 break;
 422                         }
 423
 424                         DEBUG((ret != KRB5_BAD_ENCTYPE) ? 3 : 10,
 425                                 (__location__ ": enc type [%u] failed to "
 426                                  "decrypt with error %s\n",
 427                                  (unsigned int)enctypes[i],
 428                                  error_message(ret)));
 429
 430                         /* successfully decrypted but ticket is just not
 431                          * valid at the moment */
 432                         if (ret == KRB5KRB_AP_ERR_TKT_NYV ||
 433                             ret == KRB5KRB_AP_ERR_TKT_EXPIRED ||
 434                             ret == KRB5KRB_AP_ERR_SKEW) {
 435                                 krb5_free_keyblock(context, key);
 436                                 cont = false;
 437                                 break;
 438                         }
 439
 440                         krb5_free_keyblock(context, key);
 441                 }
 442                 if (!cont) {
 443                         /* If we found a valid pass then no need to try
 444                          * the next one or we have invalid ticket so no need
 445                          * to try next password*/
 446                         break;
 447                 }
 448         }
 449
 450  out:
 451         SAFE_FREE(passwords[0].data);
 452         SAFE_FREE(passwords[1].data);
 453         *perr = ret;
 454         return auth_ok;
 455 }
 456
 457 /*****************************************************************************
 458  Verify an incoming ticket and parse out the principal name and
 459  authorization_data if available.
 460 ******************************************************************************/
 461
 462 NTSTATUS ads_verify_ticket(TALLOC_CTX *mem_ctx,
 463                            const char *realm,
 464                            time_t time_offset,
 465                            const DATA_BLOB *ticket,
 466                            char **principal,
 467                            struct PAC_LOGON_INFO **logon_info,
 468                            DATA_BLOB *ap_rep,
 469                            DATA_BLOB *session_key,
 470                            bool use_replay_cache)
 471 {
 472         NTSTATUS sret = NT_STATUS_LOGON_FAILURE;
 473         NTSTATUS pac_ret;
 474         DATA_BLOB auth_data;
 475         krb5_context context = NULL;
 476         krb5_auth_context auth_context = NULL;
 477         krb5_data packet;
 478         krb5_ticket *tkt = NULL;
 479         krb5_rcache rcache = NULL;
 480         krb5_keyblock *keyblock = NULL;
 481         time_t authtime;
 482         krb5_error_code ret = 0;
 483         int flags = 0;
 484         krb5_principal host_princ = NULL;
 485         krb5_const_principal client_principal = NULL;
 486         char *host_princ_s = NULL;
 487         bool auth_ok = False;
 488         bool got_auth_data = False;
 489         struct named_mutex *mutex = NULL;
 490
 491         ZERO_STRUCT(packet);
 492         ZERO_STRUCT(auth_data);
 493
 494         *principal = NULL;
 495         *logon_info = NULL;
 496         *ap_rep = data_blob_null;
 497         *session_key = data_blob_null;
 498
 499         initialize_krb5_error_table();
 500         ret = krb5_init_context(&context);
 501         if (ret) {
 502                 DEBUG(1, (__location__ ": krb5_init_context failed (%s)\n",
 503                           error_message(ret)));
 504                 return NT_STATUS_LOGON_FAILURE;
 505         }
 506
 507         if (time_offset != 0) {
 508                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 509         }
 510
 511         ret = krb5_set_default_realm(context, realm);
 512         if (ret) {
 513                 DEBUG(1, (__location__ ": krb5_set_default_realm "
 514                           "failed (%s)\n", error_message(ret)));
 515                 goto out;
 516         }
 517
 518         /* This whole process is far more complex than I would
 519            like. We have to go through all this to allow us to store
 520            the secret internally, instead of using /etc/krb5.keytab */
 521
 522         ret = krb5_auth_con_init(context, &auth_context);
 523         if (ret) {
 524                 DEBUG(1, (__location__ ": krb5_auth_con_init failed (%s)\n",
 525                           error_message(ret)));
 526                 goto out;
 527         }
 528
 529         krb5_auth_con_getflags( context, auth_context, &flags );
 530         if ( !use_replay_cache ) {
 531                 /* Disable default use of a replay cache */
 532                 flags &= ~KRB5_AUTH_CONTEXT_DO_TIME;
 533                 krb5_auth_con_setflags( context, auth_context, flags );
 534         }
 535
 536         if (asprintf(&host_princ_s, "%s$", global_myname()) == -1) {
 537                 goto out;
 538         }
 539
 540         strlower_m(host_princ_s);
 541         ret = smb_krb5_parse_name(context, host_princ_s, &host_princ);
 542         if (ret) {
 543                 DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) "
 544                           "failed (%s)\n", host_princ_s, error_message(ret)));
 545                 goto out;
 546         }
 547
 548
 549         if (use_replay_cache) {
 550
 551                 /* Lock a mutex surrounding the replay as there is no
 552                    locking in the MIT krb5 code surrounding the replay
 553                    cache... */
 554
 555                 mutex = grab_named_mutex(talloc_tos(),
 556                                          "replay cache mutex", 10);
 557                 if (mutex == NULL) {
 558                         DEBUG(1, (__location__ ": unable to protect replay "
 559                                   "cache with mutex.\n"));
 560                         ret = KRB5_CC_IO;
 561                         goto out;
 562                 }
 563
 564                 /* JRA. We must set the rcache here. This will prevent
 565                    replay attacks. */
 566
 567                 ret = krb5_get_server_rcache(
 568                                 context,
 569                                 krb5_princ_component(context, host_princ, 0),
 570                                 &rcache);
 571                 if (ret) {
 572                         DEBUG(1, (__location__ ": krb5_get_server_rcache "
 573                                   "failed (%s)\n", error_message(ret)));
 574                         goto out;
 575                 }
 576
 577                 ret = krb5_auth_con_setrcache(context, auth_context, rcache);
 578                 if (ret) {
 579                         DEBUG(1, (__location__ ": krb5_auth_con_setrcache "
 580                                   "failed (%s)\n", error_message(ret)));
 581                         goto out;
 582                 }
 583         }
 584
 585         switch (lp_kerberos_method()) {
 586         default:
 587         case KERBEROS_VERIFY_SECRETS:
 588                 auth_ok = ads_secrets_verify_ticket(context, auth_context,
 589                     host_princ, ticket, &tkt, &keyblock, &ret);
 590                 break;
 591         case KERBEROS_VERIFY_SYSTEM_KEYTAB:
 592                 auth_ok = ads_keytab_verify_ticket(context, auth_context,
 593                     ticket, &tkt, &keyblock, &ret);
 594                 break;
 595         case KERBEROS_VERIFY_DEDICATED_KEYTAB:
 596                 auth_ok = ads_dedicated_keytab_verify_ticket(context,
 597                     auth_context, ticket, &tkt, &keyblock, &ret);
 598                 break;
 599         case KERBEROS_VERIFY_SECRETS_AND_KEYTAB:
 600                 /* First try secrets.tdb and fallback to the krb5.keytab if
 601                    necessary.  This is the pre 3.4 behavior when
 602                    "use kerberos keytab" was true.*/
 603                 auth_ok = ads_secrets_verify_ticket(context, auth_context,
 604                     host_princ, ticket, &tkt, &keyblock, &ret);
 605
 606                 if (!auth_ok) {
 607                         /* Only fallback if we failed to decrypt the ticket */
 608                         if (ret != KRB5KRB_AP_ERR_TKT_NYV &&
 609                             ret != KRB5KRB_AP_ERR_TKT_EXPIRED &&
 610                             ret != KRB5KRB_AP_ERR_SKEW) {
 611                                 auth_ok = ads_keytab_verify_ticket(context,
 612                                     auth_context, ticket, &tkt, &keyblock,
 613                                     &ret);
 614                         }
 615                 }
 616                 break;
 617         }
 618
 619         if (use_replay_cache) {
 620                 TALLOC_FREE(mutex);
 621 #if 0
 622                 /* Heimdal leaks here, if we fix the leak, MIT crashes */
 623                 if (rcache) {
 624                         krb5_rc_close(context, rcache);
 625                 }
 626 #endif
 627         }
 628
 629         if (!auth_ok) {
 630                 DEBUG(3, (__location__ ": krb5_rd_req with auth "
 631                           "failed (%s)\n", error_message(ret)));
 632                 /* Try map the error return in case it's something like
 633                  * a clock skew error.
 634                  */
 635                 sret = krb5_to_nt_status(ret);
 636                 if (NT_STATUS_IS_OK(sret) ||
 637                     NT_STATUS_EQUAL(sret,NT_STATUS_UNSUCCESSFUL)) {
 638                         sret = NT_STATUS_LOGON_FAILURE;
 639                 }
 640                 DEBUG(10, (__location__ ": returning error %s\n",
 641                            nt_errstr(sret) ));
 642                 goto out;
 643         }
 644
 645         authtime = get_authtime_from_tkt(tkt);
 646         client_principal = get_principal_from_tkt(tkt);
 647
 648         ret = krb5_mk_rep(context, auth_context, &packet);
 649         if (ret) {
 650                 DEBUG(3, (__location__ ": Failed to generate mutual "
 651                           "authentication reply (%s)\n", error_message(ret)));
 652                 goto out;
 653         }
 654
 655         *ap_rep = data_blob(packet.data, packet.length);
 656         if (packet.data) {
 657                 kerberos_free_data_contents(context, &packet);
 658                 ZERO_STRUCT(packet);
 659         }
 660
 661         get_krb5_smb_session_key(mem_ctx, context,
 662                                  auth_context, session_key, true);
 663         dump_data_pw("SMB session key (from ticket)\n",
 664                      session_key->data, session_key->length);
 665
 666 #if 0
 667         file_save("/tmp/ticket.dat", ticket->data, ticket->length);
 668 #endif
 669
 670         /* continue when no PAC is retrieved or we couldn't decode the PAC
 671            (like accounts that have the UF_NO_AUTH_DATA_REQUIRED flag set, or
 672            Kerberos tickets encrypted using a DES key) - Guenther */
 673
 674         got_auth_data = get_auth_data_from_tkt(mem_ctx, &auth_data, tkt);
 675         if (!got_auth_data) {
 676                 DEBUG(3, (__location__ ": did not retrieve auth data. "
 677                           "continuing without PAC\n"));
 678         }
 679
 680         if (got_auth_data) {
 681                 struct PAC_DATA *pac_data;
 682                 pac_ret = decode_pac_data(mem_ctx, &auth_data, context,
 683                                           keyblock, client_principal,
 684                                           authtime, &pac_data);
 685                 data_blob_free(&auth_data);
 686                 if (!NT_STATUS_IS_OK(pac_ret)) {
 687                         DEBUG(3, (__location__ ": failed to decode "
 688                                   "PAC_DATA: %s\n", nt_errstr(pac_ret)));
 689                 } else {
 690                         uint32_t i;
 691                         for (i = 0; i < pac_data->num_buffers; i++) {
 692
 693                                 if (pac_data->buffers[i].type != PAC_TYPE_LOGON_INFO) {
 694                                         continue;
 695                                 }
 696
 697                                 *logon_info = pac_data->buffers[i].info->logon_info.info;
 698                         }
 699
 700                         if (!*logon_info) {
 701                                 DEBUG(1, ("correctly decoded PAC but found "
 702                                           "no logon_info! "
 703                                           "This should not happen\n"));
 704                                 return NT_STATUS_INVALID_USER_BUFFER;
 705                         }
 706                 }
 707         }
 708
 709 #if 0
 710 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 711         /* MIT */
 712         if (tkt->enc_part2) {
 713                 file_save("/tmp/authdata.dat",
 714                           tkt->enc_part2->authorization_data[0]->contents,
 715                           tkt->enc_part2->authorization_data[0]->length);
 716         }
 717 #else
 718         /* Heimdal */
 719         if (tkt->ticket.authorization_data) {
 720                 file_save("/tmp/authdata.dat",
 721                           tkt->ticket.authorization_data->val->ad_data.data,
 722                           tkt->ticket.authorization_data->val->ad_data.length);
 723         }
 724 #endif
 725 #endif
 726
 727         ret = smb_krb5_unparse_name(mem_ctx, context,
 728                                     client_principal, principal);
 729         if (ret) {
 730                 DEBUG(3, (__location__ ": smb_krb5_unparse_name "
 731                           "failed (%s)\n", error_message(ret)));
 732                 sret = NT_STATUS_LOGON_FAILURE;
 733                 goto out;
 734         }
 735
 736         sret = NT_STATUS_OK;
 737
 738 out:
 739
 740         TALLOC_FREE(mutex);
 741
 742         if (!NT_STATUS_IS_OK(sret)) {
 743                 data_blob_free(&auth_data);
 744         }
 745
 746         if (!NT_STATUS_IS_OK(sret)) {
 747                 data_blob_free(ap_rep);
 748         }
 749
 750         if (host_princ) {
 751                 krb5_free_principal(context, host_princ);
 752         }
 753
 754         if (keyblock) {
 755                 krb5_free_keyblock(context, keyblock);
 756         }
 757
 758         if (tkt != NULL) {
 759                 krb5_free_ticket(context, tkt);
 760         }
 761
 762         SAFE_FREE(host_princ_s);
 763
 764         if (auth_context) {
 765                 krb5_auth_con_free(context, auth_context);
 766         }
 767
 768         if (context) {
 769                 krb5_free_context(context);
 770         }
 771
 772         return sret;
 773 }
 774
 775 #endif /* HAVE_KRB5 */