source3/libads/kerberos_keytab.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    kerberos keytab utility library
   4    Copyright (C) Andrew Tridgell 2001
   5    Copyright (C) Remus Koos 2001
   6    Copyright (C) Luke Howard 2003
   7    Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2003
   8    Copyright (C) Guenther Deschner 2003
   9    Copyright (C) Rakesh Patel 2004
  10    Copyright (C) Dan Perry 2004
  11    Copyright (C) Jeremy Allison 2004
  12    Copyright (C) Gerald Carter 2006
  13
  14    This program is free software; you can redistribute it and/or modify
  15    it under the terms of the GNU General Public License as published by
  16    the Free Software Foundation; either version 3 of the License, or
  17    (at your option) any later version.
  18
  19    This program is distributed in the hope that it will be useful,
  20    but WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22    GNU General Public License for more details.
  23
  24    You should have received a copy of the GNU General Public License
  25    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  26 */
  27
  28 #include "includes.h"
  29 #include "smb_krb5.h"
  30 #include "ads.h"
  31 #include "secrets.h"
  32
  33 #ifdef HAVE_KRB5
  34
  35 /**********************************************************************
  36 **********************************************************************/
  37
  38 static krb5_error_code seek_and_delete_old_entries(krb5_context context,
  39                                                    krb5_keytab keytab,
  40                                                    krb5_kvno kvno,
  41                                                    const char *princ_s,
  42                                                    krb5_principal princ,
  43                                                    bool flush,
  44                                                    bool keep_old_entries)
  45 {
  46         krb5_error_code ret;
  47         krb5_kt_cursor cursor;
  48         krb5_kt_cursor zero_csr;
  49         krb5_keytab_entry kt_entry;
  50         krb5_keytab_entry zero_kt_entry;
  51         char *ktprinc = NULL;
  52
  53         ZERO_STRUCT(cursor);
  54         ZERO_STRUCT(zero_csr);
  55         ZERO_STRUCT(kt_entry);
  56         ZERO_STRUCT(zero_kt_entry);
  57
  58         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
  59         if (ret == KRB5_KT_END || ret == ENOENT ) {
  60                 /* no entries */
  61                 return 0;
  62         }
  63
  64         DEBUG(3, (__location__ ": Will try to delete old keytab entries\n"));
  65         while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
  66                 bool name_ok = False;
  67
  68                 if (!flush && (princ_s != NULL)) {
  69                         ret = smb_krb5_unparse_name(talloc_tos(), context,
  70                                                     kt_entry.principal,
  71                                                     &ktprinc);
  72                         if (ret) {
  73                                 DEBUG(1, (__location__
  74                                           ": smb_krb5_unparse_name failed "
  75                                           "(%s)\n", error_message(ret)));
  76                                 goto out;
  77                         }
  78
  79 #ifdef HAVE_KRB5_KT_COMPARE
  80                         name_ok = krb5_kt_compare(context, &kt_entry,
  81                                                   princ, 0, 0);
  82 #else
  83                         name_ok = (strcmp(ktprinc, princ_s) == 0);
  84 #endif
  85
  86                         if (!name_ok) {
  87                                 DEBUG(10, (__location__ ": ignoring keytab "
  88                                            "entry principal %s, kvno = %d\n",
  89                                            ktprinc, kt_entry.vno));
  90
  91                                 /* Not a match,
  92                                  * just free this entry and continue. */
  93                                 ret = smb_krb5_kt_free_entry(context,
  94                                                              &kt_entry);
  95                                 ZERO_STRUCT(kt_entry);
  96                                 if (ret) {
  97                                         DEBUG(1, (__location__
  98                                                   ": smb_krb5_kt_free_entry "
  99                                                   "failed (%s)\n",
 100                                                   error_message(ret)));
 101                                         goto out;
 102                                 }
 103
 104                                 TALLOC_FREE(ktprinc);
 105                                 continue;
 106                         }
 107
 108                         TALLOC_FREE(ktprinc);
 109                 }
 110
 111                 /*------------------------------------------------------------
 112                  * Save the entries with kvno - 1. This is what microsoft does
 113                  * to allow people with existing sessions that have kvno - 1
 114                  * to still work. Otherwise, when the password for the machine
 115                  * changes, all kerberizied sessions will 'break' until either
 116                  * the client reboots or the client's session key expires and
 117                  * they get a new session ticket with the new kvno.
 118                  */
 119
 120                 if (!flush && (kt_entry.vno == kvno - 1)) {
 121                         DEBUG(5, (__location__ ": Saving previous (kvno %d) "
 122                                   "entry for principal: %s.\n",
 123                                   kvno - 1, princ_s));
 124                         continue;
 125                 }
 126
 127                 if (keep_old_entries) {
 128                         DEBUG(5, (__location__ ": Saving old (kvno %d) "
 129                                   "entry for principal: %s.\n",
 130                                   kvno, princ_s));
 131                         continue;
 132                 }
 133
 134                 DEBUG(5, (__location__ ": Found old entry for principal: %s "
 135                           "(kvno %d) - trying to remove it.\n",
 136                           princ_s, kt_entry.vno));
 137
 138                 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 139                 ZERO_STRUCT(cursor);
 140                 if (ret) {
 141                         DEBUG(1, (__location__ ": krb5_kt_end_seq_get() "
 142                                   "failed (%s)\n", error_message(ret)));
 143                         goto out;
 144                 }
 145                 ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
 146                 if (ret) {
 147                         DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
 148                                   "failed (%s)\n", error_message(ret)));
 149                         goto out;
 150                 }
 151
 152                 DEBUG(5, (__location__ ": removed old entry for principal: "
 153                           "%s (kvno %d).\n", princ_s, kt_entry.vno));
 154
 155                 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 156                 if (ret) {
 157                         DEBUG(1, (__location__ ": krb5_kt_start_seq() failed "
 158                                   "(%s)\n", error_message(ret)));
 159                         goto out;
 160                 }
 161                 ret = smb_krb5_kt_free_entry(context, &kt_entry);
 162                 ZERO_STRUCT(kt_entry);
 163                 if (ret) {
 164                         DEBUG(1, (__location__ ": krb5_kt_remove_entry() "
 165                                   "failed (%s)\n", error_message(ret)));
 166                         goto out;
 167                 }
 168         }
 169
 170 out:
 171         if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 172                 smb_krb5_kt_free_entry(context, &kt_entry);
 173         }
 174         if (keytab) {
 175                 if (memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) {
 176                         krb5_kt_end_seq_get(context, keytab, &cursor);
 177                 }
 178         }
 179
 180         return ret;
 181 }
 182
 183 static int smb_krb5_kt_add_entry(krb5_context context,
 184                                  krb5_keytab keytab,
 185                                  krb5_kvno kvno,
 186                                  const char *princ_s,
 187                                  krb5_enctype *enctypes,
 188                                  krb5_data password,
 189                                  bool no_salt,
 190                                  bool keep_old_entries)
 191 {
 192         krb5_error_code ret;
 193         krb5_keytab_entry kt_entry;
 194         krb5_principal princ = NULL;
 195         int i;
 196
 197         ZERO_STRUCT(kt_entry);
 198
 199         ret = smb_krb5_parse_name(context, princ_s, &princ);
 200         if (ret) {
 201                 DEBUG(1, (__location__ ": smb_krb5_parse_name(%s) "
 202                           "failed (%s)\n", princ_s, error_message(ret)));
 203                 goto out;
 204         }
 205
 206         /* Seek and delete old keytab entries */
 207         ret = seek_and_delete_old_entries(context, keytab, kvno,
 208                                           princ_s, princ, false,
 209                                           keep_old_entries);
 210         if (ret) {
 211                 goto out;
 212         }
 213
 214         /* If we get here, we have deleted all the old entries with kvno's
 215          * not equal to the current kvno-1. */
 216
 217         /* Now add keytab entries for all encryption types */
 218         for (i = 0; enctypes[i]; i++) {
 219                 krb5_keyblock *keyp;
 220
 221                 keyp = KRB5_KT_KEY(&kt_entry);
 222
 223                 if (create_kerberos_key_from_string(context, princ,
 224                                                     &password, keyp,
 225                                                     enctypes[i], no_salt)) {
 226                         continue;
 227                 }
 228
 229                 kt_entry.principal = princ;
 230                 kt_entry.vno       = kvno;
 231
 232                 DEBUG(3, (__location__ ": adding keytab entry for (%s) with "
 233                           "encryption type (%d) and version (%d)\n",
 234                           princ_s, enctypes[i], kt_entry.vno));
 235                 ret = krb5_kt_add_entry(context, keytab, &kt_entry);
 236                 krb5_free_keyblock_contents(context, keyp);
 237                 ZERO_STRUCT(kt_entry);
 238                 if (ret) {
 239                         DEBUG(1, (__location__ ": adding entry to keytab "
 240                                   "failed (%s)\n", error_message(ret)));
 241                         goto out;
 242                 }
 243         }
 244
 245 out:
 246         if (princ) {
 247                 krb5_free_principal(context, princ);
 248         }
 249
 250         return (int)ret;
 251 }
 252
 253 #ifdef HAVE_ADS
 254
 255 /**********************************************************************
 256  Adds a single service principal, i.e. 'host' to the system keytab
 257 ***********************************************************************/
 258
 259 int ads_keytab_add_entry(ADS_STRUCT *ads, const char *srvPrinc)
 260 {
 261         krb5_error_code ret = 0;
 262         krb5_context context = NULL;
 263         krb5_keytab keytab = NULL;
 264         krb5_data password;
 265         krb5_kvno kvno;
 266         krb5_enctype enctypes[4] = {
 267                 ENCTYPE_DES_CBC_CRC,
 268                 ENCTYPE_DES_CBC_MD5,
 269                 ENCTYPE_ARCFOUR_HMAC,
 270                 0
 271         };
 272         char *princ_s = NULL;
 273         char *short_princ_s = NULL;
 274         char *password_s = NULL;
 275         char *my_fqdn;
 276         TALLOC_CTX *tmpctx = NULL;
 277         char *machine_name;
 278         ADS_STATUS aderr;
 279
 280         initialize_krb5_error_table();
 281         ret = krb5_init_context(&context);
 282         if (ret) {
 283                 DEBUG(1, (__location__ ": could not krb5_init_context: %s\n",
 284                           error_message(ret)));
 285                 return -1;
 286         }
 287
 288         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 289         if (ret) {
 290                 DEBUG(1, (__location__ ": smb_krb5_open_keytab failed (%s)\n",
 291                           error_message(ret)));
 292                 goto out;
 293         }
 294
 295         /* retrieve the password */
 296         if (!secrets_init()) {
 297                 DEBUG(1, (__location__ ": secrets_init failed\n"));
 298                 ret = -1;
 299                 goto out;
 300         }
 301         password_s = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
 302         if (!password_s) {
 303                 DEBUG(1, (__location__ ": failed to fetch machine password\n"));
 304                 ret = -1;
 305                 goto out;
 306         }
 307         ZERO_STRUCT(password);
 308         password.data = password_s;
 309         password.length = strlen(password_s);
 310
 311         /* we need the dNSHostName value here */
 312         tmpctx = talloc_init(__location__);
 313         if (!tmpctx) {
 314                 DEBUG(0, (__location__ ": talloc_init() failed!\n"));
 315                 ret = -1;
 316                 goto out;
 317         }
 318
 319         my_fqdn = ads_get_dnshostname(ads, tmpctx, lp_netbios_name());
 320         if (!my_fqdn) {
 321                 DEBUG(0, (__location__ ": unable to determine machine "
 322                           "account's dns name in AD!\n"));
 323                 ret = -1;
 324                 goto out;
 325         }
 326
 327         machine_name = ads_get_samaccountname(ads, tmpctx, lp_netbios_name());
 328         if (!machine_name) {
 329                 DEBUG(0, (__location__ ": unable to determine machine "
 330                           "account's short name in AD!\n"));
 331                 ret = -1;
 332                 goto out;
 333         }
 334         /*strip the trailing '$' */
 335         machine_name[strlen(machine_name)-1] = '\0';
 336
 337         /* Construct our principal */
 338         if (strchr_m(srvPrinc, '@')) {
 339                 /* It's a fully-named principal. */
 340                 princ_s = talloc_asprintf(tmpctx, "%s", srvPrinc);
 341                 if (!princ_s) {
 342                         ret = -1;
 343                         goto out;
 344                 }
 345         } else if (srvPrinc[strlen(srvPrinc)-1] == '$') {
 346                 /* It's the machine account, as used by smbclient clients. */
 347                 princ_s = talloc_asprintf(tmpctx, "%s@%s",
 348                                           srvPrinc, lp_realm());
 349                 if (!princ_s) {
 350                         ret = -1;
 351                         goto out;
 352                 }
 353         } else {
 354                 /* It's a normal service principal.  Add the SPN now so that we
 355                  * can obtain credentials for it and double-check the salt value
 356                  * used to generate the service's keys. */
 357
 358                 princ_s = talloc_asprintf(tmpctx, "%s/%s@%s",
 359                                           srvPrinc, my_fqdn, lp_realm());
 360                 if (!princ_s) {
 361                         ret = -1;
 362                         goto out;
 363                 }
 364                 short_princ_s = talloc_asprintf(tmpctx, "%s/%s@%s",
 365                                                 srvPrinc, machine_name,
 366                                                 lp_realm());
 367                 if (!princ_s) {
 368                         ret = -1;
 369                         goto out;
 370                 }
 371
 372                 /* According to http://support.microsoft.com/kb/326985/en-us,
 373                    certain principal names are automatically mapped to the
 374                    host/... principal in the AD account.
 375                    So only create these in the keytab, not in AD.  --jerry */
 376
 377                 if (!strequal(srvPrinc, "cifs") &&
 378                     !strequal(srvPrinc, "host")) {
 379                         DEBUG(3, (__location__ ": Attempting to add/update "
 380                                   "'%s'\n", princ_s));
 381
 382                         aderr = ads_add_service_principal_name(ads,
 383                                         lp_netbios_name(), my_fqdn, srvPrinc);
 384                         if (!ADS_ERR_OK(aderr)) {
 385                                 DEBUG(1, (__location__ ": failed to "
 386                                          "ads_add_service_principal_name.\n"));
 387                                 goto out;
 388                         }
 389                 }
 390         }
 391
 392         kvno = (krb5_kvno)ads_get_machine_kvno(ads, lp_netbios_name());
 393         if (kvno == -1) {
 394                 /* -1 indicates failure, everything else is OK */
 395                 DEBUG(1, (__location__ ": ads_get_machine_kvno failed to "
 396                          "determine the system's kvno.\n"));
 397                 ret = -1;
 398                 goto out;
 399         }
 400
 401         /* add the fqdn principal to the keytab */
 402         ret = smb_krb5_kt_add_entry(context, keytab, kvno,
 403                                     princ_s, enctypes, password,
 404                                     false, false);
 405         if (ret) {
 406                 DEBUG(1, (__location__ ": Failed to add entry to keytab\n"));
 407                 goto out;
 408         }
 409
 410         /* add the short principal name if we have one */
 411         if (short_princ_s) {
 412                 ret = smb_krb5_kt_add_entry(context, keytab, kvno,
 413                                             short_princ_s, enctypes, password,
 414                                             false, false);
 415                 if (ret) {
 416                         DEBUG(1, (__location__
 417                                   ": Failed to add short entry to keytab\n"));
 418                         goto out;
 419                 }
 420         }
 421
 422 out:
 423         TALLOC_FREE(tmpctx);
 424
 425         if (keytab) {
 426                 krb5_kt_close(context, keytab);
 427         }
 428         if (context) {
 429                 krb5_free_context(context);
 430         }
 431         return (int)ret;
 432 }
 433
 434 /**********************************************************************
 435  Flushes all entries from the system keytab.
 436 ***********************************************************************/
 437
 438 int ads_keytab_flush(ADS_STRUCT *ads)
 439 {
 440         krb5_error_code ret = 0;
 441         krb5_context context = NULL;
 442         krb5_keytab keytab = NULL;
 443         krb5_kvno kvno;
 444         ADS_STATUS aderr;
 445
 446         initialize_krb5_error_table();
 447         ret = krb5_init_context(&context);
 448         if (ret) {
 449                 DEBUG(1, (__location__ ": could not krb5_init_context: %s\n",
 450                           error_message(ret)));
 451                 return ret;
 452         }
 453
 454         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 455         if (ret) {
 456                 DEBUG(1, (__location__ ": smb_krb5_open_keytab failed (%s)\n",
 457                           error_message(ret)));
 458                 goto out;
 459         }
 460
 461         kvno = (krb5_kvno)ads_get_machine_kvno(ads, lp_netbios_name());
 462         if (kvno == -1) {
 463                 /* -1 indicates a failure */
 464                 DEBUG(1, (__location__ ": Error determining the kvno.\n"));
 465                 goto out;
 466         }
 467
 468         /* Seek and delete old keytab entries */
 469         ret = seek_and_delete_old_entries(context, keytab, kvno,
 470                                           NULL, NULL, true, false);
 471         if (ret) {
 472                 goto out;
 473         }
 474
 475         aderr = ads_clear_service_principal_names(ads, lp_netbios_name());
 476         if (!ADS_ERR_OK(aderr)) {
 477                 DEBUG(1, (__location__ ": Error while clearing service "
 478                           "principal listings in LDAP.\n"));
 479                 goto out;
 480         }
 481
 482 out:
 483         if (keytab) {
 484                 krb5_kt_close(context, keytab);
 485         }
 486         if (context) {
 487                 krb5_free_context(context);
 488         }
 489         return ret;
 490 }
 491
 492 /**********************************************************************
 493  Adds all the required service principals to the system keytab.
 494 ***********************************************************************/
 495
 496 int ads_keytab_create_default(ADS_STRUCT *ads)
 497 {
 498         krb5_error_code ret = 0;
 499         krb5_context context = NULL;
 500         krb5_keytab keytab = NULL;
 501         krb5_kt_cursor cursor;
 502         krb5_keytab_entry kt_entry;
 503         krb5_kvno kvno;
 504         int i, found = 0;
 505         char *sam_account_name, *upn;
 506         char **oldEntries = NULL, *princ_s[26];
 507         TALLOC_CTX *tmpctx = NULL;
 508         char *machine_name;
 509
 510         /* these are the main ones we need */
 511         ret = ads_keytab_add_entry(ads, "host");
 512         if (ret != 0) {
 513                 DEBUG(1, (__location__ ": ads_keytab_add_entry failed while "
 514                           "adding 'host' principal.\n"));
 515                 return ret;
 516         }
 517
 518
 519 #if 0   /* don't create the CIFS/... keytab entries since no one except smbd
 520            really needs them and we will fall back to verifying against
 521            secrets.tdb */
 522
 523         ret = ads_keytab_add_entry(ads, "cifs"));
 524         if (ret != 0 ) {
 525                 DEBUG(1, (__location__ ": ads_keytab_add_entry failed while "
 526                           "adding 'cifs'.\n"));
 527                 return ret;
 528         }
 529 #endif
 530
 531         memset(princ_s, '\0', sizeof(princ_s));
 532         ZERO_STRUCT(kt_entry);
 533         ZERO_STRUCT(cursor);
 534
 535         initialize_krb5_error_table();
 536         ret = krb5_init_context(&context);
 537         if (ret) {
 538                 DEBUG(1, (__location__ ": could not krb5_init_context: %s\n",
 539                           error_message(ret)));
 540                 return ret;
 541         }
 542
 543         tmpctx = talloc_init(__location__);
 544         if (!tmpctx) {
 545                 DEBUG(0, (__location__ ": talloc_init() failed!\n"));
 546                 ret = -1;
 547                 goto done;
 548         }
 549
 550         machine_name = talloc_strdup(tmpctx, lp_netbios_name());
 551         if (!machine_name) {
 552                 ret = -1;
 553                 goto done;
 554         }
 555
 556         /* now add the userPrincipalName and sAMAccountName entries */
 557         sam_account_name = ads_get_samaccountname(ads, tmpctx, machine_name);
 558         if (!sam_account_name) {
 559                 DEBUG(0, (__location__ ": unable to determine machine "
 560                           "account's name in AD!\n"));
 561                 ret = -1;
 562                 goto done;
 563         }
 564
 565         /* upper case the sAMAccountName to make it easier for apps to
 566            know what case to use in the keytab file */
 567         strupper_m(sam_account_name);
 568
 569         ret = ads_keytab_add_entry(ads, sam_account_name);
 570         if (ret != 0) {
 571                 DEBUG(1, (__location__ ": ads_keytab_add_entry() failed "
 572                           "while adding sAMAccountName (%s)\n",
 573                           sam_account_name));
 574                 goto done;
 575         }
 576
 577         /* remember that not every machine account will have a upn */
 578         upn = ads_get_upn(ads, tmpctx, machine_name);
 579         if (upn) {
 580                 ret = ads_keytab_add_entry(ads, upn);
 581                 if (ret != 0) {
 582                         DEBUG(1, (__location__ ": ads_keytab_add_entry() "
 583                                   "failed while adding UPN (%s)\n", upn));
 584                         goto done;
 585                 }
 586         }
 587
 588         /* Now loop through the keytab and update any other existing entries */
 589         kvno = (krb5_kvno)ads_get_machine_kvno(ads, machine_name);
 590         if (kvno == -1) {
 591                 DEBUG(1, (__location__ ": ads_get_machine_kvno() failed to "
 592                           "determine the system's kvno.\n"));
 593                 goto done;
 594         }
 595
 596         DEBUG(3, (__location__ ": Searching for keytab entries to preserve "
 597                   "and update.\n"));
 598
 599         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 600         if (ret) {
 601                 DEBUG(1, (__location__ ": smb_krb5_open_keytab failed (%s)\n",
 602                           error_message(ret)));
 603                 goto done;
 604         }
 605
 606         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 607         if (ret != KRB5_KT_END && ret != ENOENT ) {
 608                 while ((ret = krb5_kt_next_entry(context, keytab,
 609                                                  &kt_entry, &cursor)) == 0) {
 610                         smb_krb5_kt_free_entry(context, &kt_entry);
 611                         ZERO_STRUCT(kt_entry);
 612                         found++;
 613                 }
 614         }
 615         krb5_kt_end_seq_get(context, keytab, &cursor);
 616         ZERO_STRUCT(cursor);
 617
 618         /*
 619          * Hmmm. There is no "rewind" function for the keytab. This means we
 620          * have a race condition where someone else could add entries after
 621          * we've counted them. Re-open asap to minimise the race. JRA.
 622          */
 623         DEBUG(3, (__location__ ": Found %d entries in the keytab.\n", found));
 624         if (!found) {
 625                 goto done;
 626         }
 627
 628         oldEntries = talloc_array(tmpctx, char *, found);
 629         if (!oldEntries) {
 630                 DEBUG(1, (__location__ ": Failed to allocate space to store "
 631                           "the old keytab entries (talloc failed?).\n"));
 632                 ret = -1;
 633                 goto done;
 634         }
 635         memset(oldEntries, '\0', found * sizeof(char *));
 636
 637         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 638         if (ret == KRB5_KT_END || ret == ENOENT) {
 639                 krb5_kt_end_seq_get(context, keytab, &cursor);
 640                 ZERO_STRUCT(cursor);
 641                 goto done;
 642         }
 643
 644         while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 645                 if (kt_entry.vno != kvno) {
 646                         char *ktprinc = NULL;
 647                         char *p;
 648
 649                         /* This returns a malloc'ed string in ktprinc. */
 650                         ret = smb_krb5_unparse_name(oldEntries, context,
 651                                                     kt_entry.principal,
 652                                                     &ktprinc);
 653                         if (ret) {
 654                                 DEBUG(1, (__location__
 655                                          ": smb_krb5_unparse_name failed "
 656                                          "(%s)\n", error_message(ret)));
 657                                 goto done;
 658                         }
 659                         /*
 660                          * From looking at the krb5 source they don't seem to
 661                          * take locale or mb strings into account.
 662                          * Maybe this is because they assume utf8 ?
 663                          * In this case we may need to convert from utf8 to
 664                          * mb charset here ? JRA.
 665                          */
 666                         p = strchr_m(ktprinc, '@');
 667                         if (p) {
 668                                 *p = '\0';
 669                         }
 670
 671                         p = strchr_m(ktprinc, '/');
 672                         if (p) {
 673                                 *p = '\0';
 674                         }
 675                         for (i = 0; i < found; i++) {
 676                                 if (!oldEntries[i]) {
 677                                         oldEntries[i] = ktprinc;
 678                                         break;
 679                                 }
 680                                 if (!strcmp(oldEntries[i], ktprinc)) {
 681                                         TALLOC_FREE(ktprinc);
 682                                         break;
 683                                 }
 684                         }
 685                         if (i == found) {
 686                                 TALLOC_FREE(ktprinc);
 687                         }
 688                 }
 689                 smb_krb5_kt_free_entry(context, &kt_entry);
 690                 ZERO_STRUCT(kt_entry);
 691         }
 692         ret = 0;
 693         for (i = 0; oldEntries[i]; i++) {
 694                 ret |= ads_keytab_add_entry(ads, oldEntries[i]);
 695                 TALLOC_FREE(oldEntries[i]);
 696         }
 697         krb5_kt_end_seq_get(context, keytab, &cursor);
 698         ZERO_STRUCT(cursor);
 699
 700 done:
 701         TALLOC_FREE(oldEntries);
 702         TALLOC_FREE(tmpctx);
 703
 704         {
 705                 krb5_keytab_entry zero_kt_entry;
 706                 ZERO_STRUCT(zero_kt_entry);
 707                 if (memcmp(&zero_kt_entry, &kt_entry,
 708                                 sizeof(krb5_keytab_entry))) {
 709                         smb_krb5_kt_free_entry(context, &kt_entry);
 710                 }
 711         }
 712         {
 713                 krb5_kt_cursor zero_csr;
 714                 ZERO_STRUCT(zero_csr);
 715                 if ((memcmp(&cursor, &zero_csr,
 716                                 sizeof(krb5_kt_cursor)) != 0) && keytab) {
 717                         krb5_kt_end_seq_get(context, keytab, &cursor);
 718                 }
 719         }
 720         if (keytab) {
 721                 krb5_kt_close(context, keytab);
 722         }
 723         if (context) {
 724                 krb5_free_context(context);
 725         }
 726         return ret;
 727 }
 728
 729 #endif /* HAVE_ADS */
 730
 731 /**********************************************************************
 732  List system keytab.
 733 ***********************************************************************/
 734
 735 int ads_keytab_list(const char *keytab_name)
 736 {
 737         krb5_error_code ret = 0;
 738         krb5_context context = NULL;
 739         krb5_keytab keytab = NULL;
 740         krb5_kt_cursor cursor;
 741         krb5_keytab_entry kt_entry;
 742
 743         ZERO_STRUCT(kt_entry);
 744         ZERO_STRUCT(cursor);
 745
 746         initialize_krb5_error_table();
 747         ret = krb5_init_context(&context);
 748         if (ret) {
 749                 DEBUG(1, (__location__ ": could not krb5_init_context: %s\n",
 750                           error_message(ret)));
 751                 return ret;
 752         }
 753
 754         ret = smb_krb5_open_keytab(context, keytab_name, False, &keytab);
 755         if (ret) {
 756                 DEBUG(1, (__location__ ": smb_krb5_open_keytab failed (%s)\n",
 757                           error_message(ret)));
 758                 goto out;
 759         }
 760
 761         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 762         if (ret) {
 763                 ZERO_STRUCT(cursor);
 764                 goto out;
 765         }
 766
 767         printf("Vno  Type                                        Principal\n");
 768
 769         while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 770
 771                 char *princ_s = NULL;
 772                 char *etype_s = NULL;
 773                 krb5_enctype enctype = 0;
 774
 775                 ret = smb_krb5_unparse_name(talloc_tos(), context,
 776                                             kt_entry.principal, &princ_s);
 777                 if (ret) {
 778                         goto out;
 779                 }
 780
 781                 enctype = smb_get_enctype_from_kt_entry(&kt_entry);
 782
 783                 ret = smb_krb5_enctype_to_string(context, enctype, &etype_s);
 784                 if (ret &&
 785                     (asprintf(&etype_s, "UNKNOWN: %d\n", enctype) == -1)) {
 786                         TALLOC_FREE(princ_s);
 787                         goto out;
 788                 }
 789
 790                 printf("%3d  %-43s %s\n", kt_entry.vno, etype_s, princ_s);
 791
 792                 TALLOC_FREE(princ_s);
 793                 SAFE_FREE(etype_s);
 794
 795                 ret = smb_krb5_kt_free_entry(context, &kt_entry);
 796                 if (ret) {
 797                         goto out;
 798                 }
 799         }
 800
 801         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 802         if (ret) {
 803                 goto out;
 804         }
 805
 806         /* Ensure we don't double free. */
 807         ZERO_STRUCT(kt_entry);
 808         ZERO_STRUCT(cursor);
 809 out:
 810
 811         {
 812                 krb5_keytab_entry zero_kt_entry;
 813                 ZERO_STRUCT(zero_kt_entry);
 814                 if (memcmp(&zero_kt_entry, &kt_entry,
 815                                 sizeof(krb5_keytab_entry))) {
 816                         smb_krb5_kt_free_entry(context, &kt_entry);
 817                 }
 818         }
 819         {
 820                 krb5_kt_cursor zero_csr;
 821                 ZERO_STRUCT(zero_csr);
 822                 if ((memcmp(&cursor, &zero_csr,
 823                                 sizeof(krb5_kt_cursor)) != 0) && keytab) {
 824                         krb5_kt_end_seq_get(context, keytab, &cursor);
 825                 }
 826         }
 827
 828         if (keytab) {
 829                 krb5_kt_close(context, keytab);
 830         }
 831         if (context) {
 832                 krb5_free_context(context);
 833         }
 834         return ret;
 835 }
 836
 837 #endif /* HAVE_KRB5 */