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 int smb_krb5_kt_add_entry_ext(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 static int smb_krb5_kt_add_entry(krb5_context context,
 254                                  krb5_keytab keytab,
 255                                  krb5_kvno kvno,
 256                                  const char *princ_s,
 257                                  krb5_enctype *enctypes,
 258                                  krb5_data password)
 259 {
 260         return smb_krb5_kt_add_entry_ext(context,
 261                                          keytab,
 262                                          kvno,
 263                                          princ_s,
 264                                          enctypes,
 265                                          password,
 266                                          false,
 267                                          false);
 268 }
 269
 270 /**********************************************************************
 271  Adds a single service principal, i.e. 'host' to the system keytab
 272 ***********************************************************************/
 273
 274 int ads_keytab_add_entry(ADS_STRUCT *ads, const char *srvPrinc)
 275 {
 276         krb5_error_code ret = 0;
 277         krb5_context context = NULL;
 278         krb5_keytab keytab = NULL;
 279         krb5_data password;
 280         krb5_kvno kvno;
 281         krb5_enctype enctypes[4] = { ENCTYPE_DES_CBC_CRC,
 282                                      ENCTYPE_DES_CBC_MD5,
 283                                      ENCTYPE_ARCFOUR_HMAC,
 284                                      0 };
 285         char *princ_s = NULL, *short_princ_s = NULL;
 286         char *password_s = NULL;
 287         char *my_fqdn;
 288         TALLOC_CTX *ctx = NULL;
 289         char *machine_name;
 290
 291         initialize_krb5_error_table();
 292         ret = krb5_init_context(&context);
 293         if (ret) {
 294                 DEBUG(1,("ads_keytab_add_entry: could not krb5_init_context: %s\n",error_message(ret)));
 295                 return -1;
 296         }
 297
 298         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 299         if (ret) {
 300                 DEBUG(1,("ads_keytab_add_entry: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 301                 goto out;
 302         }
 303
 304         /* retrieve the password */
 305         if (!secrets_init()) {
 306                 DEBUG(1,("ads_keytab_add_entry: secrets_init failed\n"));
 307                 ret = -1;
 308                 goto out;
 309         }
 310         password_s = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
 311         if (!password_s) {
 312                 DEBUG(1,("ads_keytab_add_entry: failed to fetch machine password\n"));
 313                 ret = -1;
 314                 goto out;
 315         }
 316         ZERO_STRUCT(password);
 317         password.data = password_s;
 318         password.length = strlen(password_s);
 319
 320         /* we need the dNSHostName value here */
 321
 322         if ( (ctx = talloc_init("ads_keytab_add_entry")) == NULL ) {
 323                 DEBUG(0,("ads_keytab_add_entry: talloc() failed!\n"));
 324                 ret = -1;
 325                 goto out;
 326         }
 327
 328         if ( (my_fqdn = ads_get_dnshostname( ads, ctx, global_myname())) == NULL ) {
 329                 DEBUG(0,("ads_keytab_add_entry: unable to determine machine account's dns name in AD!\n"));
 330                 ret = -1;
 331                 goto out;
 332         }
 333
 334         if ( (machine_name = ads_get_samaccountname( ads, ctx, global_myname())) == NULL ) {
 335                 DEBUG(0,("ads_keytab_add_entry: unable to determine machine account's short name in AD!\n"));
 336                 ret = -1;
 337                 goto out;
 338         }
 339         /*strip the trailing '$' */
 340         machine_name[strlen(machine_name)-1] = '\0';
 341
 342         /* Construct our principal */
 343
 344         if (strchr_m(srvPrinc, '@')) {
 345                 /* It's a fully-named principal. */
 346                 if (asprintf(&princ_s, "%s", srvPrinc) == -1) {
 347                         ret = -1;
 348                         goto out;
 349                 }
 350         } else if (srvPrinc[strlen(srvPrinc)-1] == '$') {
 351                 /* It's the machine account, as used by smbclient clients. */
 352                 if (asprintf(&princ_s, "%s@%s", srvPrinc, lp_realm()) == -1) {
 353                         ret = -1;
 354                         goto out;
 355                 }
 356         } else {
 357                 /* It's a normal service principal.  Add the SPN now so that we
 358                  * can obtain credentials for it and double-check the salt value
 359                  * used to generate the service's keys. */
 360
 361                 if (asprintf(&princ_s, "%s/%s@%s", srvPrinc, my_fqdn, lp_realm()) == -1) {
 362                         ret = -1;
 363                         goto out;
 364                 }
 365                 if (asprintf(&short_princ_s, "%s/%s@%s", srvPrinc, machine_name, lp_realm()) == -1) {
 366                         ret = -1;
 367                         goto out;
 368                 }
 369
 370                 /* According to http://support.microsoft.com/kb/326985/en-us,
 371                    certain principal names are automatically mapped to the host/...
 372                    principal in the AD account.  So only create these in the
 373                    keytab, not in AD.  --jerry */
 374
 375                 if ( !strequal( srvPrinc, "cifs" ) && !strequal(srvPrinc, "host" ) ) {
 376                         DEBUG(3,("ads_keytab_add_entry: Attempting to add/update '%s'\n", princ_s));
 377
 378                         if (!ADS_ERR_OK(ads_add_service_principal_name(ads, global_myname(), my_fqdn, srvPrinc))) {
 379                                 DEBUG(1,("ads_keytab_add_entry: ads_add_service_principal_name failed.\n"));
 380                                 goto out;
 381                         }
 382                 }
 383         }
 384
 385         kvno = (krb5_kvno) ads_get_machine_kvno(ads, global_myname());
 386         if (kvno == -1) {       /* -1 indicates failure, everything else is OK */
 387                 DEBUG(1,("ads_keytab_add_entry: ads_get_machine_kvno failed to determine the system's kvno.\n"));
 388                 ret = -1;
 389                 goto out;
 390         }
 391
 392         /* add the fqdn principal to the keytab */
 393
 394         ret = smb_krb5_kt_add_entry( context, keytab, kvno, princ_s, enctypes, password );
 395         if ( ret ) {
 396                 DEBUG(1,("ads_keytab_add_entry: Failed to add entry to keytab file\n"));
 397                 goto out;
 398         }
 399
 400         /* add the short principal name if we have one */
 401
 402         if ( short_princ_s ) {
 403                 ret = smb_krb5_kt_add_entry( context, keytab, kvno, short_princ_s, enctypes, password );
 404                 if ( ret ) {
 405                         DEBUG(1,("ads_keytab_add_entry: Failed to add short entry to keytab file\n"));
 406                         goto out;
 407                 }
 408         }
 409
 410 out:
 411         SAFE_FREE( princ_s );
 412         SAFE_FREE( short_princ_s );
 413         TALLOC_FREE( ctx );
 414
 415         if (keytab) {
 416                 krb5_kt_close(context, keytab);
 417         }
 418         if (context) {
 419                 krb5_free_context(context);
 420         }
 421         return (int)ret;
 422 }
 423
 424 /**********************************************************************
 425  Flushes all entries from the system keytab.
 426 ***********************************************************************/
 427
 428 int ads_keytab_flush(ADS_STRUCT *ads)
 429 {
 430         krb5_error_code ret = 0;
 431         krb5_context context = NULL;
 432         krb5_keytab keytab = NULL;
 433         krb5_kvno kvno;
 434         ADS_STATUS aderr;
 435
 436         initialize_krb5_error_table();
 437         ret = krb5_init_context(&context);
 438         if (ret) {
 439                 DEBUG(1, (__location__ ": could not krb5_init_context: %s\n",
 440                           error_message(ret)));
 441                 return ret;
 442         }
 443
 444         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 445         if (ret) {
 446                 DEBUG(1, (__location__ ": smb_krb5_open_keytab failed (%s)\n",
 447                           error_message(ret)));
 448                 goto out;
 449         }
 450
 451         kvno = (krb5_kvno)ads_get_machine_kvno(ads, global_myname());
 452         if (kvno == -1) {
 453                 /* -1 indicates a failure */
 454                 DEBUG(1, (__location__ ": Error determining the kvno.\n"));
 455                 goto out;
 456         }
 457
 458         /* Seek and delete old keytab entries */
 459         ret = seek_and_delete_old_entries(context, keytab, kvno,
 460                                           NULL, NULL, true, false);
 461         if (ret) {
 462                 goto out;
 463         }
 464
 465         aderr = ads_clear_service_principal_names(ads, global_myname());
 466         if (!ADS_ERR_OK(aderr)) {
 467                 DEBUG(1, (__location__ ": Error while clearing service "
 468                           "principal listings in LDAP.\n"));
 469                 goto out;
 470         }
 471
 472 out:
 473         if (keytab) {
 474                 krb5_kt_close(context, keytab);
 475         }
 476         if (context) {
 477                 krb5_free_context(context);
 478         }
 479         return ret;
 480 }
 481
 482 /**********************************************************************
 483  Adds all the required service principals to the system keytab.
 484 ***********************************************************************/
 485
 486 int ads_keytab_create_default(ADS_STRUCT *ads)
 487 {
 488         krb5_error_code ret = 0;
 489         krb5_context context = NULL;
 490         krb5_keytab keytab = NULL;
 491         krb5_kt_cursor cursor;
 492         krb5_keytab_entry kt_entry;
 493         krb5_kvno kvno;
 494         int i, found = 0;
 495         char *sam_account_name, *upn;
 496         char **oldEntries = NULL, *princ_s[26];
 497         TALLOC_CTX *ctx = NULL;
 498         fstring machine_name;
 499
 500         memset(princ_s, '\0', sizeof(princ_s));
 501
 502         fstrcpy( machine_name, global_myname() );
 503
 504         /* these are the main ones we need */
 505
 506         if ( (ret = ads_keytab_add_entry(ads, "host") ) != 0 ) {
 507                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding 'host'.\n"));
 508                 return ret;
 509         }
 510
 511
 512 #if 0   /* don't create the CIFS/... keytab entries since no one except smbd
 513            really needs them and we will fall back to verifying against secrets.tdb */
 514
 515         if ( (ret = ads_keytab_add_entry(ads, "cifs")) != 0 ) {
 516                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding 'cifs'.\n"));
 517                 return ret;
 518         }
 519 #endif
 520
 521         if ( (ctx = talloc_init("ads_keytab_create_default")) == NULL ) {
 522                 DEBUG(0,("ads_keytab_create_default: talloc() failed!\n"));
 523                 return -1;
 524         }
 525
 526         /* now add the userPrincipalName and sAMAccountName entries */
 527
 528         if ( (sam_account_name = ads_get_samaccountname( ads, ctx, machine_name)) == NULL ) {
 529                 DEBUG(0,("ads_keytab_add_entry: unable to determine machine account's name in AD!\n"));
 530                 TALLOC_FREE( ctx );
 531                 return -1;
 532         }
 533
 534         /* upper case the sAMAccountName to make it easier for apps to
 535            know what case to use in the keytab file */
 536
 537         strupper_m( sam_account_name );
 538
 539         if ( (ret = ads_keytab_add_entry(ads, sam_account_name )) != 0 ) {
 540                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding sAMAccountName (%s)\n",
 541                         sam_account_name));
 542                 return ret;
 543         }
 544
 545         /* remember that not every machine account will have a upn */
 546
 547         upn = ads_get_upn( ads, ctx, machine_name);
 548         if ( upn ) {
 549                 if ( (ret = ads_keytab_add_entry(ads, upn)) != 0 ) {
 550                         DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding UPN (%s)\n",
 551                                 upn));
 552                         TALLOC_FREE( ctx );
 553                         return ret;
 554                 }
 555         }
 556
 557         /* Now loop through the keytab and update any other existing entries... */
 558
 559         kvno = (krb5_kvno) ads_get_machine_kvno(ads, machine_name);
 560         if (kvno == -1) {
 561                 DEBUG(1,("ads_keytab_create_default: ads_get_machine_kvno failed to determine the system's kvno.\n"));
 562                 TALLOC_FREE(ctx);
 563                 return -1;
 564         }
 565
 566         DEBUG(3,("ads_keytab_create_default: Searching for keytab entries to "
 567                 "preserve and update.\n"));
 568
 569         ZERO_STRUCT(kt_entry);
 570         ZERO_STRUCT(cursor);
 571
 572         initialize_krb5_error_table();
 573         ret = krb5_init_context(&context);
 574         if (ret) {
 575                 DEBUG(1,("ads_keytab_create_default: could not krb5_init_context: %s\n",error_message(ret)));
 576                 TALLOC_FREE(ctx);
 577                 return ret;
 578         }
 579
 580         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 581         if (ret) {
 582                 DEBUG(1,("ads_keytab_create_default: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 583                 goto done;
 584         }
 585
 586         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 587         if (ret != KRB5_KT_END && ret != ENOENT ) {
 588                 while ((ret = krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) == 0) {
 589                         smb_krb5_kt_free_entry(context, &kt_entry);
 590                         ZERO_STRUCT(kt_entry);
 591                         found++;
 592                 }
 593         }
 594         krb5_kt_end_seq_get(context, keytab, &cursor);
 595         ZERO_STRUCT(cursor);
 596
 597         /*
 598          * Hmmm. There is no "rewind" function for the keytab. This means we have a race condition
 599          * where someone else could add entries after we've counted them. Re-open asap to minimise
 600          * the race. JRA.
 601          */
 602
 603         DEBUG(3, ("ads_keytab_create_default: Found %d entries in the keytab.\n", found));
 604         if (!found) {
 605                 goto done;
 606         }
 607         oldEntries = talloc_array(ctx, char *, found );
 608         if (!oldEntries) {
 609                 DEBUG(1,("ads_keytab_create_default: Failed to allocate space to store the old keytab entries (malloc failed?).\n"));
 610                 ret = -1;
 611                 goto done;
 612         }
 613         memset(oldEntries, '\0', found * sizeof(char *));
 614
 615         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 616         if (ret != KRB5_KT_END && ret != ENOENT ) {
 617                 while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 618                         if (kt_entry.vno != kvno) {
 619                                 char *ktprinc = NULL;
 620                                 char *p;
 621
 622                                 /* This returns a malloc'ed string in ktprinc. */
 623                                 ret = smb_krb5_unparse_name(oldEntries, context, kt_entry.principal, &ktprinc);
 624                                 if (ret) {
 625                                         DEBUG(1,("smb_krb5_unparse_name failed (%s)\n", error_message(ret)));
 626                                         goto done;
 627                                 }
 628                                 /*
 629                                  * From looking at the krb5 source they don't seem to take locale
 630                                  * or mb strings into account. Maybe this is because they assume utf8 ?
 631                                  * In this case we may need to convert from utf8 to mb charset here ? JRA.
 632                                  */
 633                                 p = strchr_m(ktprinc, '@');
 634                                 if (p) {
 635                                         *p = '\0';
 636                                 }
 637
 638                                 p = strchr_m(ktprinc, '/');
 639                                 if (p) {
 640                                         *p = '\0';
 641                                 }
 642                                 for (i = 0; i < found; i++) {
 643                                         if (!oldEntries[i]) {
 644                                                 oldEntries[i] = ktprinc;
 645                                                 break;
 646                                         }
 647                                         if (!strcmp(oldEntries[i], ktprinc)) {
 648                                                 TALLOC_FREE(ktprinc);
 649                                                 break;
 650                                         }
 651                                 }
 652                                 if (i == found) {
 653                                         TALLOC_FREE(ktprinc);
 654                                 }
 655                         }
 656                         smb_krb5_kt_free_entry(context, &kt_entry);
 657                         ZERO_STRUCT(kt_entry);
 658                 }
 659                 ret = 0;
 660                 for (i = 0; oldEntries[i]; i++) {
 661                         ret |= ads_keytab_add_entry(ads, oldEntries[i]);
 662                         TALLOC_FREE(oldEntries[i]);
 663                 }
 664                 krb5_kt_end_seq_get(context, keytab, &cursor);
 665         }
 666         ZERO_STRUCT(cursor);
 667
 668 done:
 669
 670         TALLOC_FREE(oldEntries);
 671         TALLOC_FREE(ctx);
 672
 673         {
 674                 krb5_keytab_entry zero_kt_entry;
 675                 ZERO_STRUCT(zero_kt_entry);
 676                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 677                         smb_krb5_kt_free_entry(context, &kt_entry);
 678                 }
 679         }
 680         {
 681                 krb5_kt_cursor zero_csr;
 682                 ZERO_STRUCT(zero_csr);
 683                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 684                         krb5_kt_end_seq_get(context, keytab, &cursor);
 685                 }
 686         }
 687         if (keytab) {
 688                 krb5_kt_close(context, keytab);
 689         }
 690         if (context) {
 691                 krb5_free_context(context);
 692         }
 693         return ret;
 694 }
 695
 696 /**********************************************************************
 697  List system keytab.
 698 ***********************************************************************/
 699
 700 int ads_keytab_list(const char *keytab_name)
 701 {
 702         krb5_error_code ret = 0;
 703         krb5_context context = NULL;
 704         krb5_keytab keytab = NULL;
 705         krb5_kt_cursor cursor;
 706         krb5_keytab_entry kt_entry;
 707
 708         ZERO_STRUCT(kt_entry);
 709         ZERO_STRUCT(cursor);
 710
 711         initialize_krb5_error_table();
 712         ret = krb5_init_context(&context);
 713         if (ret) {
 714                 DEBUG(1,("ads_keytab_list: could not krb5_init_context: %s\n",error_message(ret)));
 715                 return ret;
 716         }
 717
 718         ret = smb_krb5_open_keytab(context, keytab_name, False, &keytab);
 719         if (ret) {
 720                 DEBUG(1,("ads_keytab_list: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 721                 goto out;
 722         }
 723
 724         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 725         if (ret) {
 726                 goto out;
 727         }
 728
 729         printf("Vno  Type        Principal\n");
 730
 731         while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 732
 733                 char *princ_s = NULL;
 734                 char *etype_s = NULL;
 735                 krb5_enctype enctype = 0;
 736
 737                 ret = smb_krb5_unparse_name(talloc_tos(), context, kt_entry.principal, &princ_s);
 738                 if (ret) {
 739                         goto out;
 740                 }
 741
 742                 enctype = smb_get_enctype_from_kt_entry(&kt_entry);
 743
 744                 ret = smb_krb5_enctype_to_string(context, enctype, &etype_s);
 745                 if (ret) {
 746                         if (asprintf(&etype_s, "UNKNOWN: %d\n", enctype) == -1)
 747                         {
 748                                 TALLOC_FREE(princ_s);
 749                                 goto out;
 750                         }
 751                 }
 752
 753                 printf("%3d  %s\t\t %s\n", kt_entry.vno, etype_s, princ_s);
 754
 755                 TALLOC_FREE(princ_s);
 756                 SAFE_FREE(etype_s);
 757
 758                 ret = smb_krb5_kt_free_entry(context, &kt_entry);
 759                 if (ret) {
 760                         goto out;
 761                 }
 762         }
 763
 764         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 765         if (ret) {
 766                 goto out;
 767         }
 768
 769         /* Ensure we don't double free. */
 770         ZERO_STRUCT(kt_entry);
 771         ZERO_STRUCT(cursor);
 772 out:
 773
 774         {
 775                 krb5_keytab_entry zero_kt_entry;
 776                 ZERO_STRUCT(zero_kt_entry);
 777                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 778                         smb_krb5_kt_free_entry(context, &kt_entry);
 779                 }
 780         }
 781         {
 782                 krb5_kt_cursor zero_csr;
 783                 ZERO_STRUCT(zero_csr);
 784                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 785                         krb5_kt_end_seq_get(context, keytab, &cursor);
 786                 }
 787         }
 788
 789         if (keytab) {
 790                 krb5_kt_close(context, keytab);
 791         }
 792         if (context) {
 793                 krb5_free_context(context);
 794         }
 795         return ret;
 796 }
 797
 798 #endif /* HAVE_KRB5 */