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 /**********************************************************************
 254  Adds a single service principal, i.e. 'host' to the system keytab
 255 ***********************************************************************/
 256
 257 int ads_keytab_add_entry(ADS_STRUCT *ads, const char *srvPrinc)
 258 {
 259         krb5_error_code ret = 0;
 260         krb5_context context = NULL;
 261         krb5_keytab keytab = NULL;
 262         krb5_data password;
 263         krb5_kvno kvno;
 264         krb5_enctype enctypes[6] = {
 265                 ENCTYPE_DES_CBC_CRC,
 266                 ENCTYPE_DES_CBC_MD5,
 267 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
 268                 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
 269 #endif
 270 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
 271                 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
 272 #endif
 273                 ENCTYPE_ARCFOUR_HMAC,
 274                 0
 275         };
 276         char *princ_s = NULL;
 277         char *short_princ_s = NULL;
 278         char *password_s = NULL;
 279         char *my_fqdn;
 280         TALLOC_CTX *tmpctx = NULL;
 281         char *machine_name;
 282         ADS_STATUS aderr;
 283
 284         initialize_krb5_error_table();
 285         ret = krb5_init_context(&context);
 286         if (ret) {
 287                 DEBUG(1, (__location__ ": could not krb5_init_context: %s\n",
 288                           error_message(ret)));
 289                 return -1;
 290         }
 291
 292         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 293         if (ret) {
 294                 DEBUG(1, (__location__ ": smb_krb5_open_keytab failed (%s)\n",
 295                           error_message(ret)));
 296                 goto out;
 297         }
 298
 299         /* retrieve the password */
 300         if (!secrets_init()) {
 301                 DEBUG(1, (__location__ ": secrets_init failed\n"));
 302                 ret = -1;
 303                 goto out;
 304         }
 305         password_s = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
 306         if (!password_s) {
 307                 DEBUG(1, (__location__ ": failed to fetch machine password\n"));
 308                 ret = -1;
 309                 goto out;
 310         }
 311         ZERO_STRUCT(password);
 312         password.data = password_s;
 313         password.length = strlen(password_s);
 314
 315         /* we need the dNSHostName value here */
 316         tmpctx = talloc_init(__location__);
 317         if (!tmpctx) {
 318                 DEBUG(0, (__location__ ": talloc_init() failed!\n"));
 319                 ret = -1;
 320                 goto out;
 321         }
 322
 323         my_fqdn = ads_get_dnshostname(ads, tmpctx, global_myname());
 324         if (!my_fqdn) {
 325                 DEBUG(0, (__location__ ": unable to determine machine "
 326                           "account's dns name in AD!\n"));
 327                 ret = -1;
 328                 goto out;
 329         }
 330
 331         machine_name = ads_get_samaccountname(ads, tmpctx, global_myname());
 332         if (!machine_name) {
 333                 DEBUG(0, (__location__ ": unable to determine machine "
 334                           "account's short name in AD!\n"));
 335                 ret = -1;
 336                 goto out;
 337         }
 338         /*strip the trailing '$' */
 339         machine_name[strlen(machine_name)-1] = '\0';
 340
 341         /* Construct our principal */
 342         if (strchr_m(srvPrinc, '@')) {
 343                 /* It's a fully-named principal. */
 344                 princ_s = talloc_asprintf(tmpctx, "%s", srvPrinc);
 345                 if (!princ_s) {
 346                         ret = -1;
 347                         goto out;
 348                 }
 349         } else if (srvPrinc[strlen(srvPrinc)-1] == '$') {
 350                 /* It's the machine account, as used by smbclient clients. */
 351                 princ_s = talloc_asprintf(tmpctx, "%s@%s",
 352                                           srvPrinc, lp_realm());
 353                 if (!princ_s) {
 354                         ret = -1;
 355                         goto out;
 356                 }
 357         } else {
 358                 /* It's a normal service principal.  Add the SPN now so that we
 359                  * can obtain credentials for it and double-check the salt value
 360                  * used to generate the service's keys. */
 361
 362                 princ_s = talloc_asprintf(tmpctx, "%s/%s@%s",
 363                                           srvPrinc, my_fqdn, lp_realm());
 364                 if (!princ_s) {
 365                         ret = -1;
 366                         goto out;
 367                 }
 368                 short_princ_s = talloc_asprintf(tmpctx, "%s/%s@%s",
 369                                                 srvPrinc, machine_name,
 370                                                 lp_realm());
 371                 if (!princ_s) {
 372                         ret = -1;
 373                         goto out;
 374                 }
 375
 376                 /* According to http://support.microsoft.com/kb/326985/en-us,
 377                    certain principal names are automatically mapped to the
 378                    host/... principal in the AD account.
 379                    So only create these in the keytab, not in AD.  --jerry */
 380
 381                 if (!strequal(srvPrinc, "cifs") &&
 382                     !strequal(srvPrinc, "host")) {
 383                         DEBUG(3, (__location__ ": Attempting to add/update "
 384                                   "'%s'\n", princ_s));
 385
 386                         aderr = ads_add_service_principal_name(ads,
 387                                         global_myname(), my_fqdn, srvPrinc);
 388                         if (!ADS_ERR_OK(aderr)) {
 389                                 DEBUG(1, (__location__ ": failed to "
 390                                          "ads_add_service_principal_name.\n"));
 391                                 goto out;
 392                         }
 393                 }
 394         }
 395
 396         kvno = (krb5_kvno)ads_get_machine_kvno(ads, global_myname());
 397         if (kvno == -1) {
 398                 /* -1 indicates failure, everything else is OK */
 399                 DEBUG(1, (__location__ ": ads_get_machine_kvno failed to "
 400                          "determine the system's kvno.\n"));
 401                 ret = -1;
 402                 goto out;
 403         }
 404
 405         /* add the fqdn principal to the keytab */
 406         ret = smb_krb5_kt_add_entry(context, keytab, kvno,
 407                                     princ_s, enctypes, password,
 408                                     false, false);
 409         if (ret) {
 410                 DEBUG(1, (__location__ ": Failed to add entry to keytab\n"));
 411                 goto out;
 412         }
 413
 414         /* add the short principal name if we have one */
 415         if (short_princ_s) {
 416                 ret = smb_krb5_kt_add_entry(context, keytab, kvno,
 417                                             short_princ_s, enctypes, password,
 418                                             false, false);
 419                 if (ret) {
 420                         DEBUG(1, (__location__
 421                                   ": Failed to add short entry to keytab\n"));
 422                         goto out;
 423                 }
 424         }
 425
 426 out:
 427         TALLOC_FREE(tmpctx);
 428
 429         if (keytab) {
 430                 krb5_kt_close(context, keytab);
 431         }
 432         if (context) {
 433                 krb5_free_context(context);
 434         }
 435         return (int)ret;
 436 }
 437
 438 /**********************************************************************
 439  Flushes all entries from the system keytab.
 440 ***********************************************************************/
 441
 442 int ads_keytab_flush(ADS_STRUCT *ads)
 443 {
 444         krb5_error_code ret = 0;
 445         krb5_context context = NULL;
 446         krb5_keytab keytab = NULL;
 447         krb5_kvno kvno;
 448         ADS_STATUS aderr;
 449
 450         initialize_krb5_error_table();
 451         ret = krb5_init_context(&context);
 452         if (ret) {
 453                 DEBUG(1, (__location__ ": could not krb5_init_context: %s\n",
 454                           error_message(ret)));
 455                 return ret;
 456         }
 457
 458         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 459         if (ret) {
 460                 DEBUG(1, (__location__ ": smb_krb5_open_keytab failed (%s)\n",
 461                           error_message(ret)));
 462                 goto out;
 463         }
 464
 465         kvno = (krb5_kvno)ads_get_machine_kvno(ads, global_myname());
 466         if (kvno == -1) {
 467                 /* -1 indicates a failure */
 468                 DEBUG(1, (__location__ ": Error determining the kvno.\n"));
 469                 goto out;
 470         }
 471
 472         /* Seek and delete old keytab entries */
 473         ret = seek_and_delete_old_entries(context, keytab, kvno,
 474                                           NULL, NULL, true, false);
 475         if (ret) {
 476                 goto out;
 477         }
 478
 479         aderr = ads_clear_service_principal_names(ads, global_myname());
 480         if (!ADS_ERR_OK(aderr)) {
 481                 DEBUG(1, (__location__ ": Error while clearing service "
 482                           "principal listings in LDAP.\n"));
 483                 goto out;
 484         }
 485
 486 out:
 487         if (keytab) {
 488                 krb5_kt_close(context, keytab);
 489         }
 490         if (context) {
 491                 krb5_free_context(context);
 492         }
 493         return ret;
 494 }
 495
 496 /**********************************************************************
 497  Adds all the required service principals to the system keytab.
 498 ***********************************************************************/
 499
 500 int ads_keytab_create_default(ADS_STRUCT *ads)
 501 {
 502         krb5_error_code ret = 0;
 503         krb5_context context = NULL;
 504         krb5_keytab keytab = NULL;
 505         krb5_kt_cursor cursor;
 506         krb5_keytab_entry kt_entry;
 507         krb5_kvno kvno;
 508         int i, found = 0;
 509         char *sam_account_name, *upn;
 510         char **oldEntries = NULL, *princ_s[26];
 511         TALLOC_CTX *tmpctx = NULL;
 512         char *machine_name;
 513
 514         /* these are the main ones we need */
 515         ret = ads_keytab_add_entry(ads, "host");
 516         if (ret != 0) {
 517                 DEBUG(1, (__location__ ": ads_keytab_add_entry failed while "
 518                           "adding 'host' principal.\n"));
 519                 return ret;
 520         }
 521
 522
 523 #if 0   /* don't create the CIFS/... keytab entries since no one except smbd
 524            really needs them and we will fall back to verifying against
 525            secrets.tdb */
 526
 527         ret = ads_keytab_add_entry(ads, "cifs"));
 528         if (ret != 0 ) {
 529                 DEBUG(1, (__location__ ": ads_keytab_add_entry failed while "
 530                           "adding 'cifs'.\n"));
 531                 return ret;
 532         }
 533 #endif
 534
 535         memset(princ_s, '\0', sizeof(princ_s));
 536         ZERO_STRUCT(kt_entry);
 537         ZERO_STRUCT(cursor);
 538
 539         initialize_krb5_error_table();
 540         ret = krb5_init_context(&context);
 541         if (ret) {
 542                 DEBUG(1, (__location__ ": could not krb5_init_context: %s\n",
 543                           error_message(ret)));
 544                 return ret;
 545         }
 546
 547         tmpctx = talloc_init(__location__);
 548         if (!tmpctx) {
 549                 DEBUG(0, (__location__ ": talloc_init() failed!\n"));
 550                 ret = -1;
 551                 goto done;
 552         }
 553
 554         machine_name = talloc_strdup(tmpctx, global_myname());
 555         if (!machine_name) {
 556                 ret = -1;
 557                 goto done;
 558         }
 559
 560         /* now add the userPrincipalName and sAMAccountName entries */
 561         sam_account_name = ads_get_samaccountname(ads, tmpctx, machine_name);
 562         if (!sam_account_name) {
 563                 DEBUG(0, (__location__ ": unable to determine machine "
 564                           "account's name in AD!\n"));
 565                 ret = -1;
 566                 goto done;
 567         }
 568
 569         /* upper case the sAMAccountName to make it easier for apps to
 570            know what case to use in the keytab file */
 571         strupper_m(sam_account_name);
 572
 573         ret = ads_keytab_add_entry(ads, sam_account_name);
 574         if (ret != 0) {
 575                 DEBUG(1, (__location__ ": ads_keytab_add_entry() failed "
 576                           "while adding sAMAccountName (%s)\n",
 577                           sam_account_name));
 578                 goto done;
 579         }
 580
 581         /* remember that not every machine account will have a upn */
 582         upn = ads_get_upn(ads, tmpctx, machine_name);
 583         if (upn) {
 584                 ret = ads_keytab_add_entry(ads, upn);
 585                 if (ret != 0) {
 586                         DEBUG(1, (__location__ ": ads_keytab_add_entry() "
 587                                   "failed while adding UPN (%s)\n", upn));
 588                         goto done;
 589                 }
 590         }
 591
 592         /* Now loop through the keytab and update any other existing entries */
 593         kvno = (krb5_kvno)ads_get_machine_kvno(ads, machine_name);
 594         if (kvno == -1) {
 595                 DEBUG(1, (__location__ ": ads_get_machine_kvno() failed to "
 596                           "determine the system's kvno.\n"));
 597                 goto done;
 598         }
 599
 600         DEBUG(3, (__location__ ": Searching for keytab entries to preserve "
 601                   "and update.\n"));
 602
 603         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 604         if (ret) {
 605                 DEBUG(1, (__location__ ": smb_krb5_open_keytab failed (%s)\n",
 606                           error_message(ret)));
 607                 goto done;
 608         }
 609
 610         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 611         if (ret != KRB5_KT_END && ret != ENOENT ) {
 612                 while ((ret = krb5_kt_next_entry(context, keytab,
 613                                                  &kt_entry, &cursor)) == 0) {
 614                         smb_krb5_kt_free_entry(context, &kt_entry);
 615                         ZERO_STRUCT(kt_entry);
 616                         found++;
 617                 }
 618         }
 619         krb5_kt_end_seq_get(context, keytab, &cursor);
 620         ZERO_STRUCT(cursor);
 621
 622         /*
 623          * Hmmm. There is no "rewind" function for the keytab. This means we
 624          * have a race condition where someone else could add entries after
 625          * we've counted them. Re-open asap to minimise the race. JRA.
 626          */
 627         DEBUG(3, (__location__ ": Found %d entries in the keytab.\n", found));
 628         if (!found) {
 629                 goto done;
 630         }
 631
 632         oldEntries = talloc_array(tmpctx, char *, found);
 633         if (!oldEntries) {
 634                 DEBUG(1, (__location__ ": Failed to allocate space to store "
 635                           "the old keytab entries (talloc failed?).\n"));
 636                 ret = -1;
 637                 goto done;
 638         }
 639         memset(oldEntries, '\0', found * sizeof(char *));
 640
 641         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 642         if (ret == KRB5_KT_END || ret == ENOENT) {
 643                 krb5_kt_end_seq_get(context, keytab, &cursor);
 644                 ZERO_STRUCT(cursor);
 645                 goto done;
 646         }
 647
 648         while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 649                 if (kt_entry.vno != kvno) {
 650                         char *ktprinc = NULL;
 651                         char *p;
 652
 653                         /* This returns a malloc'ed string in ktprinc. */
 654                         ret = smb_krb5_unparse_name(oldEntries, context,
 655                                                     kt_entry.principal,
 656                                                     &ktprinc);
 657                         if (ret) {
 658                                 DEBUG(1, (__location__
 659                                          ": smb_krb5_unparse_name failed "
 660                                          "(%s)\n", error_message(ret)));
 661                                 goto done;
 662                         }
 663                         /*
 664                          * From looking at the krb5 source they don't seem to
 665                          * take locale or mb strings into account.
 666                          * Maybe this is because they assume utf8 ?
 667                          * In this case we may need to convert from utf8 to
 668                          * mb charset here ? JRA.
 669                          */
 670                         p = strchr_m(ktprinc, '@');
 671                         if (p) {
 672                                 *p = '\0';
 673                         }
 674
 675                         p = strchr_m(ktprinc, '/');
 676                         if (p) {
 677                                 *p = '\0';
 678                         }
 679                         for (i = 0; i < found; i++) {
 680                                 if (!oldEntries[i]) {
 681                                         oldEntries[i] = ktprinc;
 682                                         break;
 683                                 }
 684                                 if (!strcmp(oldEntries[i], ktprinc)) {
 685                                         TALLOC_FREE(ktprinc);
 686                                         break;
 687                                 }
 688                         }
 689                         if (i == found) {
 690                                 TALLOC_FREE(ktprinc);
 691                         }
 692                 }
 693                 smb_krb5_kt_free_entry(context, &kt_entry);
 694                 ZERO_STRUCT(kt_entry);
 695         }
 696         ret = 0;
 697         for (i = 0; oldEntries[i]; i++) {
 698                 ret |= ads_keytab_add_entry(ads, oldEntries[i]);
 699                 TALLOC_FREE(oldEntries[i]);
 700         }
 701         krb5_kt_end_seq_get(context, keytab, &cursor);
 702         ZERO_STRUCT(cursor);
 703
 704 done:
 705         TALLOC_FREE(oldEntries);
 706         TALLOC_FREE(tmpctx);
 707
 708         {
 709                 krb5_keytab_entry zero_kt_entry;
 710                 ZERO_STRUCT(zero_kt_entry);
 711                 if (memcmp(&zero_kt_entry, &kt_entry,
 712                                 sizeof(krb5_keytab_entry))) {
 713                         smb_krb5_kt_free_entry(context, &kt_entry);
 714                 }
 715         }
 716         {
 717                 krb5_kt_cursor zero_csr;
 718                 ZERO_STRUCT(zero_csr);
 719                 if ((memcmp(&cursor, &zero_csr,
 720                                 sizeof(krb5_kt_cursor)) != 0) && keytab) {
 721                         krb5_kt_end_seq_get(context, keytab, &cursor);
 722                 }
 723         }
 724         if (keytab) {
 725                 krb5_kt_close(context, keytab);
 726         }
 727         if (context) {
 728                 krb5_free_context(context);
 729         }
 730         return ret;
 731 }
 732
 733 /**********************************************************************
 734  List system keytab.
 735 ***********************************************************************/
 736
 737 int ads_keytab_list(const char *keytab_name)
 738 {
 739         krb5_error_code ret = 0;
 740         krb5_context context = NULL;
 741         krb5_keytab keytab = NULL;
 742         krb5_kt_cursor cursor;
 743         krb5_keytab_entry kt_entry;
 744
 745         ZERO_STRUCT(kt_entry);
 746         ZERO_STRUCT(cursor);
 747
 748         initialize_krb5_error_table();
 749         ret = krb5_init_context(&context);
 750         if (ret) {
 751                 DEBUG(1, (__location__ ": could not krb5_init_context: %s\n",
 752                           error_message(ret)));
 753                 return ret;
 754         }
 755
 756         ret = smb_krb5_open_keytab(context, keytab_name, False, &keytab);
 757         if (ret) {
 758                 DEBUG(1, (__location__ ": smb_krb5_open_keytab failed (%s)\n",
 759                           error_message(ret)));
 760                 goto out;
 761         }
 762
 763         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 764         if (ret) {
 765                 ZERO_STRUCT(cursor);
 766                 goto out;
 767         }
 768
 769         printf("Vno  Type        Principal\n");
 770
 771         while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 772
 773                 char *princ_s = NULL;
 774                 char *etype_s = NULL;
 775                 krb5_enctype enctype = 0;
 776
 777                 ret = smb_krb5_unparse_name(talloc_tos(), context,
 778                                             kt_entry.principal, &princ_s);
 779                 if (ret) {
 780                         goto out;
 781                 }
 782
 783                 enctype = smb_get_enctype_from_kt_entry(&kt_entry);
 784
 785                 ret = smb_krb5_enctype_to_string(context, enctype, &etype_s);
 786                 if (ret &&
 787                     (asprintf(&etype_s, "UNKNOWN: %d\n", enctype) == -1)) {
 788                         TALLOC_FREE(princ_s);
 789                         goto out;
 790                 }
 791
 792                 printf("%3d  %s\t\t %s\n", kt_entry.vno, etype_s, princ_s);
 793
 794                 TALLOC_FREE(princ_s);
 795                 SAFE_FREE(etype_s);
 796
 797                 ret = smb_krb5_kt_free_entry(context, &kt_entry);
 798                 if (ret) {
 799                         goto out;
 800                 }
 801         }
 802
 803         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 804         if (ret) {
 805                 goto out;
 806         }
 807
 808         /* Ensure we don't double free. */
 809         ZERO_STRUCT(kt_entry);
 810         ZERO_STRUCT(cursor);
 811 out:
 812
 813         {
 814                 krb5_keytab_entry zero_kt_entry;
 815                 ZERO_STRUCT(zero_kt_entry);
 816                 if (memcmp(&zero_kt_entry, &kt_entry,
 817                                 sizeof(krb5_keytab_entry))) {
 818                         smb_krb5_kt_free_entry(context, &kt_entry);
 819                 }
 820         }
 821         {
 822                 krb5_kt_cursor zero_csr;
 823                 ZERO_STRUCT(zero_csr);
 824                 if ((memcmp(&cursor, &zero_csr,
 825                                 sizeof(krb5_kt_cursor)) != 0) && keytab) {
 826                         krb5_kt_end_seq_get(context, keytab, &cursor);
 827                 }
 828         }
 829
 830         if (keytab) {
 831                 krb5_kt_close(context, keytab);
 832         }
 833         if (context) {
 834                 krb5_free_context(context);
 835         }
 836         return ret;
 837 }
 838
 839 #endif /* HAVE_KRB5 */