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$,{host,cifs}/{name,fqdn,name.REALM}. */
 153
 154         fstrcpy(my_name, global_myname());
 155
 156         my_fqdn[0] = '\0';
 157         name_to_fqdn(my_fqdn, global_myname());
 158
 159         err = asprintf(&valid_princ_formats[0],
 160                         "%s$@%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         TALLOC_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 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
 348                 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
 349 #endif
 350 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
 351                 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
 352 #endif
 353                 ENCTYPE_ARCFOUR_HMAC,
 354                 ENCTYPE_DES_CBC_CRC,
 355                 ENCTYPE_DES_CBC_MD5,
 356                 ENCTYPE_NULL
 357         };
 358         krb5_data packet;
 359         int i, j;
 360
 361         *pp_tkt = NULL;
 362         *keyblock = NULL;
 363         *perr = 0;
 364
 365         ZERO_STRUCT(passwords);
 366
 367         if (!secrets_init()) {
 368                 DEBUG(1,("ads_secrets_verify_ticket: secrets_init failed\n"));
 369                 *perr = KRB5_CONFIG_CANTOPEN;
 370                 return False;
 371         }
 372
 373         password_s = secrets_fetch_machine_password(lp_workgroup(),
 374                                                     NULL, NULL);
 375         if (!password_s) {
 376                 DEBUG(1,(__location__ ": failed to fetch machine password\n"));
 377                 *perr = KRB5_LIBOS_CANTREADPWD;
 378                 return False;
 379         }
 380
 381         passwords[0].data = password_s;
 382         passwords[0].length = strlen(password_s);
 383
 384         password_s = secrets_fetch_prev_machine_password(lp_workgroup());
 385         if (password_s) {
 386                 DEBUG(10, (__location__ ": found previous password\n"));
 387                 passwords[1].data = password_s;
 388                 passwords[1].length = strlen(password_s);
 389         }
 390
 391         /* CIFS doesn't use addresses in tickets. This would break NAT. JRA */
 392
 393         packet.length = ticket->length;
 394         packet.data = (char *)ticket->data;
 395
 396         /* We need to setup a auth context with each possible encoding type
 397          * in turn. */
 398         for (j=0; j<2 && passwords[j].length; j++) {
 399
 400                 for (i=0;enctypes[i];i++) {
 401                         krb5_keyblock *key = NULL;
 402
 403                         if (!(key = SMB_MALLOC_P(krb5_keyblock))) {
 404                                 ret = ENOMEM;
 405                                 goto out;
 406                         }
 407
 408                         if (create_kerberos_key_from_string(context,
 409                                                 host_princ, &passwords[j],
 410                                                 key, enctypes[i], false)) {
 411                                 SAFE_FREE(key);
 412                                 continue;
 413                         }
 414
 415                         krb5_auth_con_setuseruserkey(context,
 416                                                         auth_context, key);
 417
 418                         if (!(ret = krb5_rd_req(context, &auth_context,
 419                                                 &packet, NULL, NULL,
 420                                                 NULL, pp_tkt))) {
 421                                 DEBUG(10, (__location__ ": enc type [%u] "
 422                                            "decrypted message !\n",
 423                                            (unsigned int)enctypes[i]));
 424                                 auth_ok = True;
 425                                 cont = false;
 426                                 krb5_copy_keyblock(context, key, keyblock);
 427                                 krb5_free_keyblock(context, key);
 428                                 break;
 429                         }
 430
 431                         DEBUG((ret != KRB5_BAD_ENCTYPE) ? 3 : 10,
 432                                 (__location__ ": enc type [%u] failed to "
 433                                  "decrypt with error %s\n",
 434                                  (unsigned int)enctypes[i],
 435                                  error_message(ret)));
 436
 437                         /* successfully decrypted but ticket is just not
 438                          * valid at the moment */
 439                         if (ret == KRB5KRB_AP_ERR_TKT_NYV ||
 440                             ret == KRB5KRB_AP_ERR_TKT_EXPIRED ||
 441                             ret == KRB5KRB_AP_ERR_SKEW) {
 442                                 krb5_free_keyblock(context, key);
 443                                 cont = false;
 444                                 break;
 445                         }
 446
 447                         krb5_free_keyblock(context, key);
 448                 }
 449                 if (!cont) {
 450                         /* If we found a valid pass then no need to try
 451                          * the next one or we have invalid ticket so no need
 452                          * to try next password*/
 453                         break;
 454                 }
 455         }
 456
 457  out:
 458         SAFE_FREE(passwords[0].data);
 459         SAFE_FREE(passwords[1].data);
 460         *perr = ret;
 461         return auth_ok;
 462 }
 463
 464 /*****************************************************************************
 465  Verify an incoming ticket and parse out the principal name and
 466  authorization_data if available.
 467 ******************************************************************************/
 468
 469 NTSTATUS ads_verify_ticket(TALLOC_CTX *mem_ctx,
 470                            const char *realm,
 471                            time_t time_offset,
 472                            const DATA_BLOB *ticket,
 473                            char **principal,
 474                            struct PAC_LOGON_INFO **logon_info,
 475                            DATA_BLOB *ap_rep,
 476                            DATA_BLOB *session_key,
 477                            bool use_replay_cache)
 478 {
 479         NTSTATUS sret = NT_STATUS_LOGON_FAILURE;
 480         NTSTATUS pac_ret;
 481         DATA_BLOB auth_data;
 482         krb5_context context = NULL;
 483         krb5_auth_context auth_context = NULL;
 484         krb5_data packet;
 485         krb5_ticket *tkt = NULL;
 486         krb5_rcache rcache = NULL;
 487         krb5_keyblock *keyblock = NULL;
 488         time_t authtime;
 489         krb5_error_code ret = 0;
 490         int flags = 0;
 491         krb5_principal host_princ = NULL;
 492         krb5_const_principal client_principal = NULL;
 493         char *host_princ_s = NULL;
 494         bool auth_ok = False;
 495         bool got_auth_data = False;
 496         struct named_mutex *mutex = NULL;
 497
 498         ZERO_STRUCT(packet);
 499         ZERO_STRUCT(auth_data);
 500
 501         *principal = NULL;
 502         *logon_info = NULL;
 503         *ap_rep = data_blob_null;
 504         *session_key = data_blob_null;
 505
 506         initialize_krb5_error_table();
 507         ret = krb5_init_context(&context);
 508         if (ret) {
 509                 DEBUG(1, (__location__ ": krb5_init_context failed (%s)\n",
 510                           error_message(ret)));
 511                 return NT_STATUS_LOGON_FAILURE;
 512         }
 513
 514         if (time_offset != 0) {
 515                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 516         }
 517
 518         ret = krb5_set_default_realm(context, realm);
 519         if (ret) {
 520                 DEBUG(1, (__location__ ": krb5_set_default_realm "
 521                           "failed (%s)\n", error_message(ret)));
 522                 goto out;
 523         }
 524
 525         /* This whole process is far more complex than I would
 526            like. We have to go through all this to allow us to store
 527            the secret internally, instead of using /etc/krb5.keytab */
 528
 529         ret = krb5_auth_con_init(context, &auth_context);
 530         if (ret) {
 531                 DEBUG(1, (__location__ ": krb5_auth_con_init failed (%s)\n",
 532                           error_message(ret)));
 533                 goto out;
 534         }
 535
 536         krb5_auth_con_getflags( context, auth_context, &flags );
 537         if ( !use_replay_cache ) {
 538                 /* Disable default use of a replay cache */
 539                 flags &= ~KRB5_AUTH_CONTEXT_DO_TIME;
 540                 krb5_auth_con_setflags( context, auth_context, flags );
 541         }
 542
 543         if (asprintf(&host_princ_s, "%s$", global_myname()) == -1) {
 544                 goto out;
 545         }
 546
 547         strlower_m(host_princ_s);
 548         ret = smb_krb5_parse_name(context, host_princ_s, &host_princ);
 549         if (ret) {
 550                 DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) "
 551                           "failed (%s)\n", host_princ_s, error_message(ret)));
 552                 goto out;
 553         }
 554
 555
 556         if (use_replay_cache) {
 557
 558                 /* Lock a mutex surrounding the replay as there is no
 559                    locking in the MIT krb5 code surrounding the replay
 560                    cache... */
 561
 562                 mutex = grab_named_mutex(talloc_tos(),
 563                                          "replay cache mutex", 10);
 564                 if (mutex == NULL) {
 565                         DEBUG(1, (__location__ ": unable to protect replay "
 566                                   "cache with mutex.\n"));
 567                         ret = KRB5_CC_IO;
 568                         goto out;
 569                 }
 570
 571                 /* JRA. We must set the rcache here. This will prevent
 572                    replay attacks. */
 573
 574                 ret = krb5_get_server_rcache(
 575                                 context,
 576                                 krb5_princ_component(context, host_princ, 0),
 577                                 &rcache);
 578                 if (ret) {
 579                         DEBUG(1, (__location__ ": krb5_get_server_rcache "
 580                                   "failed (%s)\n", error_message(ret)));
 581                         goto out;
 582                 }
 583
 584                 ret = krb5_auth_con_setrcache(context, auth_context, rcache);
 585                 if (ret) {
 586                         DEBUG(1, (__location__ ": krb5_auth_con_setrcache "
 587                                   "failed (%s)\n", error_message(ret)));
 588                         goto out;
 589                 }
 590         }
 591
 592         switch (lp_kerberos_method()) {
 593         default:
 594         case KERBEROS_VERIFY_SECRETS:
 595                 auth_ok = ads_secrets_verify_ticket(context, auth_context,
 596                     host_princ, ticket, &tkt, &keyblock, &ret);
 597                 break;
 598         case KERBEROS_VERIFY_SYSTEM_KEYTAB:
 599                 auth_ok = ads_keytab_verify_ticket(context, auth_context,
 600                     ticket, &tkt, &keyblock, &ret);
 601                 break;
 602         case KERBEROS_VERIFY_DEDICATED_KEYTAB:
 603                 auth_ok = ads_dedicated_keytab_verify_ticket(context,
 604                     auth_context, ticket, &tkt, &keyblock, &ret);
 605                 break;
 606         case KERBEROS_VERIFY_SECRETS_AND_KEYTAB:
 607                 /* First try secrets.tdb and fallback to the krb5.keytab if
 608                    necessary.  This is the pre 3.4 behavior when
 609                    "use kerberos keytab" was true.*/
 610                 auth_ok = ads_secrets_verify_ticket(context, auth_context,
 611                     host_princ, ticket, &tkt, &keyblock, &ret);
 612
 613                 if (!auth_ok) {
 614                         /* Only fallback if we failed to decrypt the ticket */
 615                         if (ret != KRB5KRB_AP_ERR_TKT_NYV &&
 616                             ret != KRB5KRB_AP_ERR_TKT_EXPIRED &&
 617                             ret != KRB5KRB_AP_ERR_SKEW) {
 618                                 auth_ok = ads_keytab_verify_ticket(context,
 619                                     auth_context, ticket, &tkt, &keyblock,
 620                                     &ret);
 621                         }
 622                 }
 623                 break;
 624         }
 625
 626         if (use_replay_cache) {
 627                 TALLOC_FREE(mutex);
 628 #if 0
 629                 /* Heimdal leaks here, if we fix the leak, MIT crashes */
 630                 if (rcache) {
 631                         krb5_rc_close(context, rcache);
 632                 }
 633 #endif
 634         }
 635
 636         if (!auth_ok) {
 637                 DEBUG(3, (__location__ ": krb5_rd_req with auth "
 638                           "failed (%s)\n", error_message(ret)));
 639                 /* Try map the error return in case it's something like
 640                  * a clock skew error.
 641                  */
 642                 sret = krb5_to_nt_status(ret);
 643                 if (NT_STATUS_IS_OK(sret) ||
 644                     NT_STATUS_EQUAL(sret,NT_STATUS_UNSUCCESSFUL)) {
 645                         sret = NT_STATUS_LOGON_FAILURE;
 646                 }
 647                 DEBUG(10, (__location__ ": returning error %s\n",
 648                            nt_errstr(sret) ));
 649                 goto out;
 650         }
 651
 652         authtime = get_authtime_from_tkt(tkt);
 653         client_principal = get_principal_from_tkt(tkt);
 654
 655         ret = krb5_mk_rep(context, auth_context, &packet);
 656         if (ret) {
 657                 DEBUG(3, (__location__ ": Failed to generate mutual "
 658                           "authentication reply (%s)\n", error_message(ret)));
 659                 goto out;
 660         }
 661
 662         *ap_rep = data_blob(packet.data, packet.length);
 663         if (packet.data) {
 664                 kerberos_free_data_contents(context, &packet);
 665                 ZERO_STRUCT(packet);
 666         }
 667
 668         get_krb5_smb_session_key(mem_ctx, context,
 669                                  auth_context, session_key, true);
 670         dump_data_pw("SMB session key (from ticket)\n",
 671                      session_key->data, session_key->length);
 672
 673 #if 0
 674         file_save("/tmp/ticket.dat", ticket->data, ticket->length);
 675 #endif
 676
 677         /* continue when no PAC is retrieved or we couldn't decode the PAC
 678            (like accounts that have the UF_NO_AUTH_DATA_REQUIRED flag set, or
 679            Kerberos tickets encrypted using a DES key) - Guenther */
 680
 681         got_auth_data = get_auth_data_from_tkt(mem_ctx, &auth_data, tkt);
 682         if (!got_auth_data) {
 683                 DEBUG(3, (__location__ ": did not retrieve auth data. "
 684                           "continuing without PAC\n"));
 685         }
 686
 687         if (got_auth_data) {
 688                 struct PAC_DATA *pac_data;
 689                 pac_ret = decode_pac_data(mem_ctx, &auth_data, context,
 690                                           keyblock, client_principal,
 691                                           authtime, &pac_data);
 692                 data_blob_free(&auth_data);
 693                 if (!NT_STATUS_IS_OK(pac_ret)) {
 694                         DEBUG(3, (__location__ ": failed to decode "
 695                                   "PAC_DATA: %s\n", nt_errstr(pac_ret)));
 696                 } else {
 697                         uint32_t i;
 698                         for (i = 0; i < pac_data->num_buffers; i++) {
 699
 700                                 if (pac_data->buffers[i].type != PAC_TYPE_LOGON_INFO) {
 701                                         continue;
 702                                 }
 703
 704                                 *logon_info = pac_data->buffers[i].info->logon_info.info;
 705                         }
 706
 707                         if (!*logon_info) {
 708                                 DEBUG(1, ("correctly decoded PAC but found "
 709                                           "no logon_info! "
 710                                           "This should not happen\n"));
 711                                 return NT_STATUS_INVALID_USER_BUFFER;
 712                         }
 713                 }
 714         }
 715
 716 #if 0
 717 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 718         /* MIT */
 719         if (tkt->enc_part2) {
 720                 file_save("/tmp/authdata.dat",
 721                           tkt->enc_part2->authorization_data[0]->contents,
 722                           tkt->enc_part2->authorization_data[0]->length);
 723         }
 724 #else
 725         /* Heimdal */
 726         if (tkt->ticket.authorization_data) {
 727                 file_save("/tmp/authdata.dat",
 728                           tkt->ticket.authorization_data->val->ad_data.data,
 729                           tkt->ticket.authorization_data->val->ad_data.length);
 730         }
 731 #endif
 732 #endif
 733
 734         ret = smb_krb5_unparse_name(mem_ctx, context,
 735                                     client_principal, principal);
 736         if (ret) {
 737                 DEBUG(3, (__location__ ": smb_krb5_unparse_name "
 738                           "failed (%s)\n", error_message(ret)));
 739                 sret = NT_STATUS_LOGON_FAILURE;
 740                 goto out;
 741         }
 742
 743         sret = NT_STATUS_OK;
 744
 745 out:
 746
 747         TALLOC_FREE(mutex);
 748
 749         if (!NT_STATUS_IS_OK(sret)) {
 750                 data_blob_free(&auth_data);
 751         }
 752
 753         if (!NT_STATUS_IS_OK(sret)) {
 754                 data_blob_free(ap_rep);
 755         }
 756
 757         if (host_princ) {
 758                 krb5_free_principal(context, host_princ);
 759         }
 760
 761         if (keyblock) {
 762                 krb5_free_keyblock(context, keyblock);
 763         }
 764
 765         if (tkt != NULL) {
 766                 krb5_free_ticket(context, tkt);
 767         }
 768
 769         SAFE_FREE(host_princ_s);
 770
 771         if (auth_context) {
 772                 krb5_auth_con_free(context, auth_context);
 773         }
 774
 775         if (context) {
 776                 krb5_free_context(context);
 777         }
 778
 779         return sret;
 780 }
 781
 782 #endif /* HAVE_KRB5 */