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