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 #include "libads/kerberos_proto.h"
  29 #include "secrets.h"
  30 #include "../librpc/gen_ndr/krb5pac.h"
  31
  32 #ifdef HAVE_KRB5
  33
  34 #if !defined(HAVE_KRB5_PRINC_COMPONENT)
  35 const krb5_data *krb5_princ_component(krb5_context, krb5_principal, int );
  36 #endif
  37
  38 static bool ads_dedicated_keytab_verify_ticket(krb5_context context,
  39                                           krb5_auth_context auth_context,
  40                                           const DATA_BLOB *ticket,
  41                                           krb5_ticket **pp_tkt,
  42                                           krb5_keyblock **keyblock,
  43                                           krb5_error_code *perr)
  44 {
  45         krb5_error_code ret = 0;
  46         bool auth_ok = false;
  47         krb5_keytab keytab = NULL;
  48         krb5_keytab_entry kt_entry;
  49         krb5_ticket *dec_ticket = NULL;
  50
  51         krb5_data packet;
  52         krb5_kvno kvno = 0;
  53         krb5_enctype enctype;
  54
  55         *pp_tkt = NULL;
  56         *keyblock = NULL;
  57         *perr = 0;
  58
  59         ZERO_STRUCT(kt_entry);
  60
  61         ret = smb_krb5_open_keytab(context, lp_dedicated_keytab_file(), true,
  62             &keytab);
  63         if (ret) {
  64                 DEBUG(1, ("smb_krb5_open_keytab failed (%s)\n",
  65                         error_message(ret)));
  66                 goto out;
  67         }
  68
  69         packet.length = ticket->length;
  70         packet.data = (char *)ticket->data;
  71
  72         ret = krb5_rd_req(context, &auth_context, &packet, NULL, keytab,
  73             NULL, &dec_ticket);
  74         if (ret) {
  75                 DEBUG(0, ("krb5_rd_req failed (%s)\n", error_message(ret)));
  76                 goto out;
  77         }
  78
  79 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
  80         enctype = dec_ticket->ticket.key.keytype;
  81 #else /* MIT */
  82         enctype = dec_ticket->enc_part.enctype;
  83         kvno    = dec_ticket->enc_part.kvno;
  84 #endif
  85
  86         /* Get the key for checking the pac signature */
  87         ret = krb5_kt_get_entry(context, keytab, dec_ticket->server,
  88                                 kvno, enctype, &kt_entry);
  89         if (ret) {
  90                 DEBUG(0, ("krb5_kt_get_entry failed (%s)\n",
  91                           error_message(ret)));
  92                 goto out;
  93         }
  94
  95         ret = krb5_copy_keyblock(context, KRB5_KT_KEY(&kt_entry), keyblock);
  96         smb_krb5_kt_free_entry(context, &kt_entry);
  97
  98         if (ret) {
  99                 DEBUG(0, ("failed to copy key: %s\n",
 100                           error_message(ret)));
 101                 goto out;
 102         }
 103
 104         auth_ok = true;
 105         *pp_tkt = dec_ticket;
 106         dec_ticket = NULL;
 107
 108   out:
 109         if (dec_ticket)
 110                 krb5_free_ticket(context, dec_ticket);
 111
 112         if (keytab)
 113                 krb5_kt_close(context, keytab);
 114
 115         *perr = ret;
 116         return auth_ok;
 117 }
 118
 119 /******************************************************************************
 120  Try to verify a ticket using the system keytab... the system keytab has
 121  kvno -1 entries, so it's more like what microsoft does... see comment in
 122  utils/net_ads.c in the ads_keytab_add_entry function for details.
 123 ******************************************************************************/
 124
 125 static bool ads_keytab_verify_ticket(krb5_context context,
 126                                         krb5_auth_context auth_context,
 127                                         const DATA_BLOB *ticket,
 128                                         krb5_ticket **pp_tkt,
 129                                         krb5_keyblock **keyblock,
 130                                         krb5_error_code *perr)
 131 {
 132         krb5_error_code ret = 0;
 133         bool auth_ok = False;
 134         krb5_keytab keytab = NULL;
 135         krb5_kt_cursor kt_cursor;
 136         krb5_keytab_entry kt_entry;
 137         char *valid_princ_formats[7] = { NULL, NULL, NULL,
 138                                          NULL, NULL, NULL, NULL };
 139         char *entry_princ_s = NULL;
 140         fstring my_name, my_fqdn;
 141         int i;
 142         int number_matched_principals = 0;
 143         krb5_data packet;
 144         int err;
 145
 146         *pp_tkt = NULL;
 147         *keyblock = NULL;
 148         *perr = 0;
 149
 150         /* Generate the list of principal names which we expect
 151          * clients might want to use for authenticating to the file
 152          * service.  We allow name$,{host,cifs}/{name,fqdn,name.REALM}. */
 153
 154         fstrcpy(my_name, lp_netbios_name());
 155
 156         my_fqdn[0] = '\0';
 157         name_to_fqdn(my_fqdn, lp_netbios_name());
 158
 159         err = asprintf(&valid_princ_formats[0],
 160                         "%s$@%s", my_name, lp_realm());
 161         if (err == -1) {
 162                 goto out;
 163         }
 164         err = asprintf(&valid_princ_formats[1],
 165                         "host/%s@%s", my_name, lp_realm());
 166         if (err == -1) {
 167                 goto out;
 168         }
 169         err = asprintf(&valid_princ_formats[2],
 170                         "host/%s@%s", my_fqdn, lp_realm());
 171         if (err == -1) {
 172                 goto out;
 173         }
 174         err = asprintf(&valid_princ_formats[3],
 175                         "host/%s.%s@%s", my_name, lp_realm(), lp_realm());
 176         if (err == -1) {
 177                 goto out;
 178         }
 179         err = asprintf(&valid_princ_formats[4],
 180                         "cifs/%s@%s", my_name, lp_realm());
 181         if (err == -1) {
 182                 goto out;
 183         }
 184         err = asprintf(&valid_princ_formats[5],
 185                         "cifs/%s@%s", my_fqdn, lp_realm());
 186         if (err == -1) {
 187                 goto out;
 188         }
 189         err = asprintf(&valid_princ_formats[6],
 190                         "cifs/%s.%s@%s", my_name, lp_realm(), lp_realm());
 191         if (err == -1) {
 192                 goto out;
 193         }
 194
 195         ZERO_STRUCT(kt_entry);
 196         ZERO_STRUCT(kt_cursor);
 197
 198         ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
 199         if (ret) {
 200                 DEBUG(1, (__location__ ": smb_krb5_open_keytab failed (%s)\n",
 201                           error_message(ret)));
 202                 goto out;
 203         }
 204
 205         /* Iterate through the keytab.  For each key, if the principal
 206          * name case-insensitively matches one of the allowed formats,
 207          * try verifying the ticket using that principal. */
 208
 209         ret = krb5_kt_start_seq_get(context, keytab, &kt_cursor);
 210         if (ret) {
 211                 DEBUG(1, (__location__ ": krb5_kt_start_seq_get failed (%s)\n",
 212                           error_message(ret)));
 213                 goto out;
 214         }
 215
 216         while (!auth_ok &&
 217                (krb5_kt_next_entry(context, keytab,
 218                                    &kt_entry, &kt_cursor) == 0)) {
 219                 ret = smb_krb5_unparse_name(talloc_tos(), context,
 220                                             kt_entry.principal,
 221                                             &entry_princ_s);
 222                 if (ret) {
 223                         DEBUG(1, (__location__ ": smb_krb5_unparse_name "
 224                                   "failed (%s)\n", error_message(ret)));
 225                         goto out;
 226                 }
 227
 228                 for (i = 0; i < ARRAY_SIZE(valid_princ_formats); i++) {
 229
 230                         if (!strequal(entry_princ_s, valid_princ_formats[i])) {
 231                                 continue;
 232                         }
 233
 234                         number_matched_principals++;
 235                         packet.length = ticket->length;
 236                         packet.data = (char *)ticket->data;
 237                         *pp_tkt = NULL;
 238
 239                         ret = krb5_rd_req_return_keyblock_from_keytab(context,
 240                                                 &auth_context, &packet,
 241                                                 kt_entry.principal, keytab,
 242                                                 NULL, pp_tkt, keyblock);
 243
 244                         if (ret) {
 245                                 DEBUG(10, (__location__ ": krb5_rd_req_return"
 246                                            "_keyblock_from_keytab(%s) "
 247                                            "failed: %s\n", entry_princ_s,
 248                                            error_message(ret)));
 249
 250                                 /* workaround for MIT:
 251                                 * as krb5_ktfile_get_entry will explicitly
 252                                 * close the krb5_keytab as soon as krb5_rd_req
 253                                 * has successfully decrypted the ticket but the
 254                                 * ticket is not valid yet (due to clockskew)
 255                                 * there is no point in querying more keytab
 256                                 * entries - Guenther */
 257
 258                                 if (ret == KRB5KRB_AP_ERR_TKT_NYV ||
 259                                     ret == KRB5KRB_AP_ERR_TKT_EXPIRED ||
 260                                     ret == KRB5KRB_AP_ERR_SKEW) {
 261                                         break;
 262                                 }
 263                         } else {
 264                                 DEBUG(3, (__location__ ": krb5_rd_req_return"
 265                                           "_keyblock_from_keytab succeeded "
 266                                           "for principal %s\n",
 267                                           entry_princ_s));
 268                                 auth_ok = True;
 269                                 break;
 270                         }
 271                 }
 272
 273                 /* Free the name we parsed. */
 274                 TALLOC_FREE(entry_princ_s);
 275
 276                 /* Free the entry we just read. */
 277                 smb_krb5_kt_free_entry(context, &kt_entry);
 278                 ZERO_STRUCT(kt_entry);
 279         }
 280         krb5_kt_end_seq_get(context, keytab, &kt_cursor);
 281
 282         ZERO_STRUCT(kt_cursor);
 283
 284 out:
 285
 286         for (i = 0; i < ARRAY_SIZE(valid_princ_formats); i++) {
 287                 SAFE_FREE(valid_princ_formats[i]);
 288         }
 289
 290         if (!auth_ok) {
 291                 if (!number_matched_principals) {
 292                         DEBUG(3, (__location__ ": no keytab principals "
 293                                   "matched expected file service name.\n"));
 294                 } else {
 295                         DEBUG(3, (__location__ ": krb5_rd_req failed for "
 296                                   "all %d matched keytab principals\n",
 297                                   number_matched_principals));
 298                 }
 299         }
 300
 301         SAFE_FREE(entry_princ_s);
 302
 303         {
 304                 krb5_keytab_entry zero_kt_entry;
 305                 ZERO_STRUCT(zero_kt_entry);
 306                 if (memcmp(&zero_kt_entry, &kt_entry,
 307                            sizeof(krb5_keytab_entry))) {
 308                         smb_krb5_kt_free_entry(context, &kt_entry);
 309                 }
 310         }
 311
 312         {
 313                 krb5_kt_cursor zero_csr;
 314                 ZERO_STRUCT(zero_csr);
 315                 if ((memcmp(&kt_cursor, &zero_csr,
 316                             sizeof(krb5_kt_cursor)) != 0) && keytab) {
 317                         krb5_kt_end_seq_get(context, keytab, &kt_cursor);
 318                 }
 319         }
 320
 321         if (keytab) {
 322                 krb5_kt_close(context, keytab);
 323         }
 324         *perr = ret;
 325         return auth_ok;
 326 }
 327
 328 /*****************************************************************************
 329  Try to verify a ticket using the secrets.tdb.
 330 ******************************************************************************/
 331
 332 static krb5_error_code ads_secrets_verify_ticket(krb5_context context,
 333                                                 krb5_auth_context auth_context,
 334                                                 krb5_principal host_princ,
 335                                                 const DATA_BLOB *ticket,
 336                                                 krb5_ticket **pp_tkt,
 337                                                 krb5_keyblock **keyblock,
 338                                                 krb5_error_code *perr)
 339 {
 340         krb5_error_code ret = 0;
 341         bool auth_ok = False;
 342         bool cont = true;
 343         char *password_s = NULL;
 344         /* Let's make some room for 2 password (old and new)*/
 345         krb5_data passwords[2];
 346         krb5_enctype enctypes[] = {
 347                 ENCTYPE_ARCFOUR_HMAC,
 348                 ENCTYPE_DES_CBC_CRC,
 349                 ENCTYPE_DES_CBC_MD5,
 350                 ENCTYPE_NULL
 351         };
 352         krb5_data packet;
 353         int i, j;
 354
 355         *pp_tkt = NULL;
 356         *keyblock = NULL;
 357         *perr = 0;
 358
 359         ZERO_STRUCT(passwords);
 360
 361         if (!secrets_init()) {
 362                 DEBUG(1,("ads_secrets_verify_ticket: secrets_init failed\n"));
 363                 *perr = KRB5_CONFIG_CANTOPEN;
 364                 return False;
 365         }
 366
 367         password_s = secrets_fetch_machine_password(lp_workgroup(),
 368                                                     NULL, NULL);
 369         if (!password_s) {
 370                 DEBUG(1,(__location__ ": failed to fetch machine password\n"));
 371                 *perr = KRB5_LIBOS_CANTREADPWD;
 372                 return False;
 373         }
 374
 375         passwords[0].data = password_s;
 376         passwords[0].length = strlen(password_s);
 377
 378         password_s = secrets_fetch_prev_machine_password(lp_workgroup());
 379         if (password_s) {
 380                 DEBUG(10, (__location__ ": found previous password\n"));
 381                 passwords[1].data = password_s;
 382                 passwords[1].length = strlen(password_s);
 383         }
 384
 385         /* CIFS doesn't use addresses in tickets. This would break NAT. JRA */
 386
 387         packet.length = ticket->length;
 388         packet.data = (char *)ticket->data;
 389
 390         /* We need to setup a auth context with each possible encoding type
 391          * in turn. */
 392         for (j=0; j<2 && passwords[j].length; j++) {
 393
 394                 for (i=0;enctypes[i];i++) {
 395                         krb5_keyblock *key = NULL;
 396
 397                         if (!(key = SMB_MALLOC_P(krb5_keyblock))) {
 398                                 ret = ENOMEM;
 399                                 goto out;
 400                         }
 401
 402                         if (create_kerberos_key_from_string(context,
 403                                                 host_princ, &passwords[j],
 404                                                 key, enctypes[i], false)) {
 405                                 SAFE_FREE(key);
 406                                 continue;
 407                         }
 408
 409                         krb5_auth_con_setuseruserkey(context,
 410                                                         auth_context, key);
 411
 412                         if (!(ret = krb5_rd_req(context, &auth_context,
 413                                                 &packet, NULL, NULL,
 414                                                 NULL, pp_tkt))) {
 415                                 DEBUG(10, (__location__ ": enc type [%u] "
 416                                            "decrypted message !\n",
 417                                            (unsigned int)enctypes[i]));
 418                                 auth_ok = True;
 419                                 cont = false;
 420                                 krb5_copy_keyblock(context, key, keyblock);
 421                                 krb5_free_keyblock(context, key);
 422                                 break;
 423                         }
 424
 425                         DEBUG((ret != KRB5_BAD_ENCTYPE) ? 3 : 10,
 426                                 (__location__ ": enc type [%u] failed to "
 427                                  "decrypt with error %s\n",
 428                                  (unsigned int)enctypes[i],
 429                                  error_message(ret)));
 430
 431                         /* successfully decrypted but ticket is just not
 432                          * valid at the moment */
 433                         if (ret == KRB5KRB_AP_ERR_TKT_NYV ||
 434                             ret == KRB5KRB_AP_ERR_TKT_EXPIRED ||
 435                             ret == KRB5KRB_AP_ERR_SKEW) {
 436                                 krb5_free_keyblock(context, key);
 437                                 cont = false;
 438                                 break;
 439                         }
 440
 441                         krb5_free_keyblock(context, key);
 442                 }
 443                 if (!cont) {
 444                         /* If we found a valid pass then no need to try
 445                          * the next one or we have invalid ticket so no need
 446                          * to try next password*/
 447                         break;
 448                 }
 449         }
 450
 451  out:
 452         SAFE_FREE(passwords[0].data);
 453         SAFE_FREE(passwords[1].data);
 454         *perr = ret;
 455         return auth_ok;
 456 }
 457
 458 /*****************************************************************************
 459  Verify an incoming ticket and parse out the principal name and
 460  authorization_data if available.
 461 ******************************************************************************/
 462
 463 NTSTATUS ads_verify_ticket(TALLOC_CTX *mem_ctx,
 464                            const char *realm,
 465                            time_t time_offset,
 466                            const DATA_BLOB *ticket,
 467                            char **principal,
 468                            struct PAC_LOGON_INFO **logon_info,
 469                            DATA_BLOB *ap_rep,
 470                            DATA_BLOB *session_key,
 471                            bool use_replay_cache)
 472 {
 473         NTSTATUS sret = NT_STATUS_LOGON_FAILURE;
 474         NTSTATUS pac_ret;
 475         DATA_BLOB auth_data;
 476         krb5_context context = NULL;
 477         krb5_auth_context auth_context = NULL;
 478         krb5_data packet;
 479         krb5_ticket *tkt = NULL;
 480         krb5_rcache rcache = NULL;
 481         krb5_keyblock *keyblock = NULL;
 482         time_t authtime;
 483         krb5_error_code ret = 0;
 484         int flags = 0;
 485         krb5_principal host_princ = NULL;
 486         krb5_const_principal client_principal = NULL;
 487         char *host_princ_s = NULL;
 488         bool auth_ok = False;
 489         bool got_auth_data = False;
 490         struct named_mutex *mutex = NULL;
 491
 492         ZERO_STRUCT(packet);
 493         ZERO_STRUCT(auth_data);
 494
 495         *principal = NULL;
 496         *logon_info = NULL;
 497         *ap_rep = data_blob_null;
 498         *session_key = data_blob_null;
 499
 500         initialize_krb5_error_table();
 501         ret = krb5_init_context(&context);
 502         if (ret) {
 503                 DEBUG(1, (__location__ ": krb5_init_context failed (%s)\n",
 504                           error_message(ret)));
 505                 return NT_STATUS_LOGON_FAILURE;
 506         }
 507
 508         if (time_offset != 0) {
 509                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 510         }
 511
 512         ret = krb5_set_default_realm(context, realm);
 513         if (ret) {
 514                 DEBUG(1, (__location__ ": krb5_set_default_realm "
 515                           "failed (%s)\n", error_message(ret)));
 516                 goto out;
 517         }
 518
 519         /* This whole process is far more complex than I would
 520            like. We have to go through all this to allow us to store
 521            the secret internally, instead of using /etc/krb5.keytab */
 522
 523         ret = krb5_auth_con_init(context, &auth_context);
 524         if (ret) {
 525                 DEBUG(1, (__location__ ": krb5_auth_con_init failed (%s)\n",
 526                           error_message(ret)));
 527                 goto out;
 528         }
 529
 530         krb5_auth_con_getflags( context, auth_context, &flags );
 531         if ( !use_replay_cache ) {
 532                 /* Disable default use of a replay cache */
 533                 flags &= ~KRB5_AUTH_CONTEXT_DO_TIME;
 534                 krb5_auth_con_setflags( context, auth_context, flags );
 535         }
 536
 537         if (asprintf(&host_princ_s, "%s$", lp_netbios_name()) == -1) {
 538                 goto out;
 539         }
 540
 541         strlower_m(host_princ_s);
 542         ret = smb_krb5_parse_name(context, host_princ_s, &host_princ);
 543         if (ret) {
 544                 DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) "
 545                           "failed (%s)\n", host_princ_s, error_message(ret)));
 546                 goto out;
 547         }
 548
 549
 550         if (use_replay_cache) {
 551
 552                 /* Lock a mutex surrounding the replay as there is no
 553                    locking in the MIT krb5 code surrounding the replay
 554                    cache... */
 555
 556                 mutex = grab_named_mutex(talloc_tos(),
 557                                          "replay cache mutex", 10);
 558                 if (mutex == NULL) {
 559                         DEBUG(1, (__location__ ": unable to protect replay "
 560                                   "cache with mutex.\n"));
 561                         ret = KRB5_CC_IO;
 562                         goto out;
 563                 }
 564
 565                 /* JRA. We must set the rcache here. This will prevent
 566                    replay attacks. */
 567
 568                 ret = krb5_get_server_rcache(
 569                                 context,
 570                                 krb5_princ_component(context, host_princ, 0),
 571                                 &rcache);
 572                 if (ret) {
 573                         DEBUG(1, (__location__ ": krb5_get_server_rcache "
 574                                   "failed (%s)\n", error_message(ret)));
 575                         goto out;
 576                 }
 577
 578                 ret = krb5_auth_con_setrcache(context, auth_context, rcache);
 579                 if (ret) {
 580                         DEBUG(1, (__location__ ": krb5_auth_con_setrcache "
 581                                   "failed (%s)\n", error_message(ret)));
 582                         goto out;
 583                 }
 584         }
 585
 586         switch (lp_kerberos_method()) {
 587         default:
 588         case KERBEROS_VERIFY_SECRETS:
 589                 auth_ok = ads_secrets_verify_ticket(context, auth_context,
 590                     host_princ, ticket, &tkt, &keyblock, &ret);
 591                 break;
 592         case KERBEROS_VERIFY_SYSTEM_KEYTAB:
 593                 auth_ok = ads_keytab_verify_ticket(context, auth_context,
 594                     ticket, &tkt, &keyblock, &ret);
 595                 break;
 596         case KERBEROS_VERIFY_DEDICATED_KEYTAB:
 597                 auth_ok = ads_dedicated_keytab_verify_ticket(context,
 598                     auth_context, ticket, &tkt, &keyblock, &ret);
 599                 break;
 600         case KERBEROS_VERIFY_SECRETS_AND_KEYTAB:
 601                 /* First try secrets.tdb and fallback to the krb5.keytab if
 602                    necessary.  This is the pre 3.4 behavior when
 603                    "use kerberos keytab" was true.*/
 604                 auth_ok = ads_secrets_verify_ticket(context, auth_context,
 605                     host_princ, ticket, &tkt, &keyblock, &ret);
 606
 607                 if (!auth_ok) {
 608                         /* Only fallback if we failed to decrypt the ticket */
 609                         if (ret != KRB5KRB_AP_ERR_TKT_NYV &&
 610                             ret != KRB5KRB_AP_ERR_TKT_EXPIRED &&
 611                             ret != KRB5KRB_AP_ERR_SKEW) {
 612                                 auth_ok = ads_keytab_verify_ticket(context,
 613                                     auth_context, ticket, &tkt, &keyblock,
 614                                     &ret);
 615                         }
 616                 }
 617                 break;
 618         }
 619
 620         if (use_replay_cache) {
 621                 TALLOC_FREE(mutex);
 622 #if 0
 623                 /* Heimdal leaks here, if we fix the leak, MIT crashes */
 624                 if (rcache) {
 625                         krb5_rc_close(context, rcache);
 626                 }
 627 #endif
 628         }
 629
 630         if (!auth_ok) {
 631                 DEBUG(3, (__location__ ": krb5_rd_req with auth "
 632                           "failed (%s)\n", error_message(ret)));
 633                 /* Try map the error return in case it's something like
 634                  * a clock skew error.
 635                  */
 636                 sret = krb5_to_nt_status(ret);
 637                 if (NT_STATUS_IS_OK(sret) ||
 638                     NT_STATUS_EQUAL(sret,NT_STATUS_UNSUCCESSFUL)) {
 639                         sret = NT_STATUS_LOGON_FAILURE;
 640                 }
 641                 DEBUG(10, (__location__ ": returning error %s\n",
 642                            nt_errstr(sret) ));
 643                 goto out;
 644         }
 645
 646         authtime = get_authtime_from_tkt(tkt);
 647         client_principal = get_principal_from_tkt(tkt);
 648
 649         ret = krb5_mk_rep(context, auth_context, &packet);
 650         if (ret) {
 651                 DEBUG(3, (__location__ ": Failed to generate mutual "
 652                           "authentication reply (%s)\n", error_message(ret)));
 653                 goto out;
 654         }
 655
 656         *ap_rep = data_blob(packet.data, packet.length);
 657         if (packet.data) {
 658                 kerberos_free_data_contents(context, &packet);
 659                 ZERO_STRUCT(packet);
 660         }
 661
 662         get_krb5_smb_session_key(mem_ctx, context,
 663                                  auth_context, session_key, true);
 664         dump_data_pw("SMB session key (from ticket)\n",
 665                      session_key->data, session_key->length);
 666
 667 #if 0
 668         file_save("/tmp/ticket.dat", ticket->data, ticket->length);
 669 #endif
 670
 671         /* continue when no PAC is retrieved or we couldn't decode the PAC
 672            (like accounts that have the UF_NO_AUTH_DATA_REQUIRED flag set, or
 673            Kerberos tickets encrypted using a DES key) - Guenther */
 674
 675         got_auth_data = get_auth_data_from_tkt(mem_ctx, &auth_data, tkt);
 676         if (!got_auth_data) {
 677                 DEBUG(3, (__location__ ": did not retrieve auth data. "
 678                           "continuing without PAC\n"));
 679         }
 680
 681         if (got_auth_data) {
 682                 struct PAC_DATA *pac_data;
 683                 pac_ret = kerberos_decode_pac(mem_ctx, auth_data, context,
 684                                               NULL, keyblock, client_principal,
 685                                               authtime, &pac_data);
 686                 data_blob_free(&auth_data);
 687                 if (!NT_STATUS_IS_OK(pac_ret)) {
 688                         DEBUG(3, (__location__ ": failed to decode "
 689                                   "PAC_DATA: %s\n", nt_errstr(pac_ret)));
 690                 } else {
 691                         uint32_t i;
 692                         for (i = 0; i < pac_data->num_buffers; i++) {
 693
 694                                 if (pac_data->buffers[i].type != PAC_TYPE_LOGON_INFO) {
 695                                         continue;
 696                                 }
 697
 698                                 *logon_info = pac_data->buffers[i].info->logon_info.info;
 699                         }
 700
 701                         if (!*logon_info) {
 702                                 DEBUG(1, ("correctly decoded PAC but found "
 703                                           "no logon_info! "
 704                                           "This should not happen\n"));
 705                                 return NT_STATUS_INVALID_USER_BUFFER;
 706                         }
 707                 }
 708         }
 709
 710 #if 0
 711 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 712         /* MIT */
 713         if (tkt->enc_part2) {
 714                 file_save("/tmp/authdata.dat",
 715                           tkt->enc_part2->authorization_data[0]->contents,
 716                           tkt->enc_part2->authorization_data[0]->length);
 717         }
 718 #else
 719         /* Heimdal */
 720         if (tkt->ticket.authorization_data) {
 721                 file_save("/tmp/authdata.dat",
 722                           tkt->ticket.authorization_data->val->ad_data.data,
 723                           tkt->ticket.authorization_data->val->ad_data.length);
 724         }
 725 #endif
 726 #endif
 727
 728         ret = smb_krb5_unparse_name(mem_ctx, context,
 729                                     client_principal, principal);
 730         if (ret) {
 731                 DEBUG(3, (__location__ ": smb_krb5_unparse_name "
 732                           "failed (%s)\n", error_message(ret)));
 733                 sret = NT_STATUS_LOGON_FAILURE;
 734                 goto out;
 735         }
 736
 737         sret = NT_STATUS_OK;
 738
 739 out:
 740
 741         TALLOC_FREE(mutex);
 742
 743         if (!NT_STATUS_IS_OK(sret)) {
 744                 data_blob_free(&auth_data);
 745         }
 746
 747         if (!NT_STATUS_IS_OK(sret)) {
 748                 data_blob_free(ap_rep);
 749         }
 750
 751         if (host_princ) {
 752                 krb5_free_principal(context, host_princ);
 753         }
 754
 755         if (keyblock) {
 756                 krb5_free_keyblock(context, keyblock);
 757         }
 758
 759         if (tkt != NULL) {
 760                 krb5_free_ticket(context, tkt);
 761         }
 762
 763         SAFE_FREE(host_princ_s);
 764
 765         if (auth_context) {
 766                 krb5_auth_con_free(context, auth_context);
 767         }
 768
 769         if (context) {
 770                 krb5_free_context(context);
 771         }
 772
 773         return sret;
 774 }
 775
 776 #endif /* HAVE_KRB5 */