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
  31 #ifdef HAVE_KRB5
  32
  33 /**********************************************************************
  34 **********************************************************************/
  35
  36 int smb_krb5_kt_add_entry_ext(krb5_context context,
  37                               krb5_keytab keytab,
  38                               krb5_kvno kvno,
  39                               const char *princ_s,
  40                               krb5_enctype *enctypes,
  41                               krb5_data password,
  42                               bool no_salt,
  43                               bool keep_old_entries)
  44 {
  45         krb5_error_code ret = 0;
  46         krb5_kt_cursor cursor;
  47         krb5_keytab_entry kt_entry;
  48         krb5_principal princ = NULL;
  49         int i;
  50         char *ktprinc = NULL;
  51
  52         ZERO_STRUCT(kt_entry);
  53         ZERO_STRUCT(cursor);
  54
  55         ret = smb_krb5_parse_name(context, princ_s, &princ);
  56         if (ret) {
  57                 DEBUG(1,("smb_krb5_kt_add_entry_ext: smb_krb5_parse_name(%s) failed (%s)\n", princ_s, error_message(ret)));
  58                 goto out;
  59         }
  60
  61         /* Seek and delete old keytab entries */
  62         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
  63         if (ret != KRB5_KT_END && ret != ENOENT ) {
  64                 DEBUG(3,("smb_krb5_kt_add_entry_ext: Will try to delete old keytab entries\n"));
  65                 while(!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
  66                         bool compare_name_ok = False;
  67
  68                         ret = smb_krb5_unparse_name(talloc_tos(), context, kt_entry.principal, &ktprinc);
  69                         if (ret) {
  70                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: smb_krb5_unparse_name failed (%s)\n",
  71                                         error_message(ret)));
  72                                 goto out;
  73                         }
  74
  75                         /*---------------------------------------------------------------------------
  76                          * Save the entries with kvno - 1.   This is what microsoft does
  77                          * to allow people with existing sessions that have kvno - 1 to still
  78                          * work.   Otherwise, when the password for the machine changes, all
  79                          * kerberizied sessions will 'break' until either the client reboots or
  80                          * the client's session key expires and they get a new session ticket
  81                          * with the new kvno.
  82                          */
  83
  84 #ifdef HAVE_KRB5_KT_COMPARE
  85                         compare_name_ok = (krb5_kt_compare(context, &kt_entry, princ, 0, 0) == True);
  86 #else
  87                         compare_name_ok = (strcmp(ktprinc, princ_s) == 0);
  88 #endif
  89
  90                         if (!compare_name_ok) {
  91                                 DEBUG(10,("smb_krb5_kt_add_entry_ext: ignoring keytab entry principal %s, kvno = %d\n",
  92                                         ktprinc, kt_entry.vno));
  93                         }
  94
  95                         TALLOC_FREE(ktprinc);
  96
  97                         if (compare_name_ok) {
  98                                 if (kt_entry.vno == kvno - 1) {
  99                                         DEBUG(5,("smb_krb5_kt_add_entry_ext: Saving previous (kvno %d) entry for principal: %s.\n",
 100                                                 kvno - 1, princ_s));
 101                                 } else if (!keep_old_entries) {
 102                                         DEBUG(5,("smb_krb5_kt_add_entry_ext: Found old entry for principal: %s (kvno %d) - trying to remove it.\n",
 103                                                 princ_s, kt_entry.vno));
 104                                         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 105                                         ZERO_STRUCT(cursor);
 106                                         if (ret) {
 107                                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: krb5_kt_end_seq_get() failed (%s)\n",
 108                                                         error_message(ret)));
 109                                                 goto out;
 110                                         }
 111                                         ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
 112                                         if (ret) {
 113                                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: krb5_kt_remove_entry failed (%s)\n",
 114                                                         error_message(ret)));
 115                                                 goto out;
 116                                         }
 117
 118                                         DEBUG(5,("smb_krb5_kt_add_entry_ext: removed old entry for principal: %s (kvno %d).\n",
 119                                                 princ_s, kt_entry.vno));
 120
 121                                         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 122                                         if (ret) {
 123                                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: krb5_kt_start_seq failed (%s)\n",
 124                                                         error_message(ret)));
 125                                                 goto out;
 126                                         }
 127                                         ret = smb_krb5_kt_free_entry(context, &kt_entry);
 128                                         ZERO_STRUCT(kt_entry);
 129                                         if (ret) {
 130                                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: krb5_kt_remove_entry failed (%s)\n",
 131                                                         error_message(ret)));
 132                                                 goto out;
 133                                         }
 134                                         continue;
 135                                 }
 136                         }
 137
 138                         /* Not a match, just free this entry and continue. */
 139                         ret = smb_krb5_kt_free_entry(context, &kt_entry);
 140                         ZERO_STRUCT(kt_entry);
 141                         if (ret) {
 142                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: smb_krb5_kt_free_entry failed (%s)\n", error_message(ret)));
 143                                 goto out;
 144                         }
 145                 }
 146
 147                 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 148                 ZERO_STRUCT(cursor);
 149                 if (ret) {
 150                         DEBUG(1,("smb_krb5_kt_add_entry_ext: krb5_kt_end_seq_get failed (%s)\n",error_message(ret)));
 151                         goto out;
 152                 }
 153         }
 154
 155         /* Ensure we don't double free. */
 156         ZERO_STRUCT(kt_entry);
 157         ZERO_STRUCT(cursor);
 158
 159         /* If we get here, we have deleted all the old entries with kvno's not equal to the current kvno-1. */
 160
 161         /* Now add keytab entries for all encryption types */
 162         for (i = 0; enctypes[i]; i++) {
 163                 krb5_keyblock *keyp;
 164
 165                 keyp = KRB5_KT_KEY(&kt_entry);
 166
 167                 if (create_kerberos_key_from_string(context, princ, &password, keyp, enctypes[i], no_salt)) {
 168                         continue;
 169                 }
 170
 171                 kt_entry.principal = princ;
 172                 kt_entry.vno       = kvno;
 173
 174                 DEBUG(3,("smb_krb5_kt_add_entry_ext: adding keytab entry for (%s) with encryption type (%d) and version (%d)\n",
 175                         princ_s, enctypes[i], kt_entry.vno));
 176                 ret = krb5_kt_add_entry(context, keytab, &kt_entry);
 177                 krb5_free_keyblock_contents(context, keyp);
 178                 ZERO_STRUCT(kt_entry);
 179                 if (ret) {
 180                         DEBUG(1,("smb_krb5_kt_add_entry_ext: adding entry to keytab failed (%s)\n", error_message(ret)));
 181                         goto out;
 182                 }
 183         }
 184
 185
 186 out:
 187         {
 188                 krb5_keytab_entry zero_kt_entry;
 189                 ZERO_STRUCT(zero_kt_entry);
 190                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 191                         smb_krb5_kt_free_entry(context, &kt_entry);
 192                 }
 193         }
 194         if (princ) {
 195                 krb5_free_principal(context, princ);
 196         }
 197
 198         {
 199                 krb5_kt_cursor zero_csr;
 200                 ZERO_STRUCT(zero_csr);
 201                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 202                         krb5_kt_end_seq_get(context, keytab, &cursor);
 203                 }
 204         }
 205
 206         return (int)ret;
 207 }
 208
 209 static int smb_krb5_kt_add_entry(krb5_context context,
 210                                  krb5_keytab keytab,
 211                                  krb5_kvno kvno,
 212                                  const char *princ_s,
 213                                  krb5_enctype *enctypes,
 214                                  krb5_data password)
 215 {
 216         return smb_krb5_kt_add_entry_ext(context,
 217                                          keytab,
 218                                          kvno,
 219                                          princ_s,
 220                                          enctypes,
 221                                          password,
 222                                          false,
 223                                          false);
 224 }
 225
 226 /**********************************************************************
 227  Adds a single service principal, i.e. 'host' to the system keytab
 228 ***********************************************************************/
 229
 230 int ads_keytab_add_entry(ADS_STRUCT *ads, const char *srvPrinc)
 231 {
 232         krb5_error_code ret = 0;
 233         krb5_context context = NULL;
 234         krb5_keytab keytab = NULL;
 235         krb5_data password;
 236         krb5_kvno kvno;
 237         krb5_enctype enctypes[4] = { ENCTYPE_DES_CBC_CRC, ENCTYPE_DES_CBC_MD5, 0, 0 };
 238         char *princ_s = NULL, *short_princ_s = NULL;
 239         char *password_s = NULL;
 240         char *my_fqdn;
 241         TALLOC_CTX *ctx = NULL;
 242         char *machine_name;
 243
 244 #if defined(ENCTYPE_ARCFOUR_HMAC)
 245         enctypes[2] = ENCTYPE_ARCFOUR_HMAC;
 246 #endif
 247
 248         initialize_krb5_error_table();
 249         ret = krb5_init_context(&context);
 250         if (ret) {
 251                 DEBUG(1,("ads_keytab_add_entry: could not krb5_init_context: %s\n",error_message(ret)));
 252                 return -1;
 253         }
 254
 255         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 256         if (ret) {
 257                 DEBUG(1,("ads_keytab_add_entry: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 258                 goto out;
 259         }
 260
 261         /* retrieve the password */
 262         if (!secrets_init()) {
 263                 DEBUG(1,("ads_keytab_add_entry: secrets_init failed\n"));
 264                 ret = -1;
 265                 goto out;
 266         }
 267         password_s = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
 268         if (!password_s) {
 269                 DEBUG(1,("ads_keytab_add_entry: failed to fetch machine password\n"));
 270                 ret = -1;
 271                 goto out;
 272         }
 273         ZERO_STRUCT(password);
 274         password.data = password_s;
 275         password.length = strlen(password_s);
 276
 277         /* we need the dNSHostName value here */
 278
 279         if ( (ctx = talloc_init("ads_keytab_add_entry")) == NULL ) {
 280                 DEBUG(0,("ads_keytab_add_entry: talloc() failed!\n"));
 281                 ret = -1;
 282                 goto out;
 283         }
 284
 285         if ( (my_fqdn = ads_get_dnshostname( ads, ctx, global_myname())) == NULL ) {
 286                 DEBUG(0,("ads_keytab_add_entry: unable to determine machine account's dns name in AD!\n"));
 287                 ret = -1;
 288                 goto out;
 289         }
 290
 291         if ( (machine_name = ads_get_samaccountname( ads, ctx, global_myname())) == NULL ) {
 292                 DEBUG(0,("ads_keytab_add_entry: unable to determine machine account's short name in AD!\n"));
 293                 ret = -1;
 294                 goto out;
 295         }
 296         /*strip the trailing '$' */
 297         machine_name[strlen(machine_name)-1] = '\0';
 298
 299         /* Construct our principal */
 300
 301         if (strchr_m(srvPrinc, '@')) {
 302                 /* It's a fully-named principal. */
 303                 if (asprintf(&princ_s, "%s", srvPrinc) == -1) {
 304                         ret = -1;
 305                         goto out;
 306                 }
 307         } else if (srvPrinc[strlen(srvPrinc)-1] == '$') {
 308                 /* It's the machine account, as used by smbclient clients. */
 309                 if (asprintf(&princ_s, "%s@%s", srvPrinc, lp_realm()) == -1) {
 310                         ret = -1;
 311                         goto out;
 312                 }
 313         } else {
 314                 /* It's a normal service principal.  Add the SPN now so that we
 315                  * can obtain credentials for it and double-check the salt value
 316                  * used to generate the service's keys. */
 317
 318                 if (asprintf(&princ_s, "%s/%s@%s", srvPrinc, my_fqdn, lp_realm()) == -1) {
 319                         ret = -1;
 320                         goto out;
 321                 }
 322                 if (asprintf(&short_princ_s, "%s/%s@%s", srvPrinc, machine_name, lp_realm()) == -1) {
 323                         ret = -1;
 324                         goto out;
 325                 }
 326
 327                 /* According to http://support.microsoft.com/kb/326985/en-us,
 328                    certain principal names are automatically mapped to the host/...
 329                    principal in the AD account.  So only create these in the
 330                    keytab, not in AD.  --jerry */
 331
 332                 if ( !strequal( srvPrinc, "cifs" ) && !strequal(srvPrinc, "host" ) ) {
 333                         DEBUG(3,("ads_keytab_add_entry: Attempting to add/update '%s'\n", princ_s));
 334
 335                         if (!ADS_ERR_OK(ads_add_service_principal_name(ads, global_myname(), my_fqdn, srvPrinc))) {
 336                                 DEBUG(1,("ads_keytab_add_entry: ads_add_service_principal_name failed.\n"));
 337                                 goto out;
 338                         }
 339                 }
 340         }
 341
 342         kvno = (krb5_kvno) ads_get_machine_kvno(ads, global_myname());
 343         if (kvno == -1) {       /* -1 indicates failure, everything else is OK */
 344                 DEBUG(1,("ads_keytab_add_entry: ads_get_machine_kvno failed to determine the system's kvno.\n"));
 345                 ret = -1;
 346                 goto out;
 347         }
 348
 349         /* add the fqdn principal to the keytab */
 350
 351         ret = smb_krb5_kt_add_entry( context, keytab, kvno, princ_s, enctypes, password );
 352         if ( ret ) {
 353                 DEBUG(1,("ads_keytab_add_entry: Failed to add entry to keytab file\n"));
 354                 goto out;
 355         }
 356
 357         /* add the short principal name if we have one */
 358
 359         if ( short_princ_s ) {
 360                 ret = smb_krb5_kt_add_entry( context, keytab, kvno, short_princ_s, enctypes, password );
 361                 if ( ret ) {
 362                         DEBUG(1,("ads_keytab_add_entry: Failed to add short entry to keytab file\n"));
 363                         goto out;
 364                 }
 365         }
 366
 367 out:
 368         SAFE_FREE( princ_s );
 369         SAFE_FREE( short_princ_s );
 370         TALLOC_FREE( ctx );
 371
 372         if (keytab) {
 373                 krb5_kt_close(context, keytab);
 374         }
 375         if (context) {
 376                 krb5_free_context(context);
 377         }
 378         return (int)ret;
 379 }
 380
 381 /**********************************************************************
 382  Flushes all entries from the system keytab.
 383 ***********************************************************************/
 384
 385 int ads_keytab_flush(ADS_STRUCT *ads)
 386 {
 387         krb5_error_code ret = 0;
 388         krb5_context context = NULL;
 389         krb5_keytab keytab = NULL;
 390         krb5_kt_cursor cursor;
 391         krb5_keytab_entry kt_entry;
 392         krb5_kvno kvno;
 393
 394         ZERO_STRUCT(kt_entry);
 395         ZERO_STRUCT(cursor);
 396
 397         initialize_krb5_error_table();
 398         ret = krb5_init_context(&context);
 399         if (ret) {
 400                 DEBUG(1,("ads_keytab_flush: could not krb5_init_context: %s\n",error_message(ret)));
 401                 return ret;
 402         }
 403
 404         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 405         if (ret) {
 406                 DEBUG(1,("ads_keytab_flush: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 407                 goto out;
 408         }
 409
 410         kvno = (krb5_kvno) ads_get_machine_kvno(ads, global_myname());
 411         if (kvno == -1) {       /* -1 indicates a failure */
 412                 DEBUG(1,("ads_keytab_flush: Error determining the system's kvno.\n"));
 413                 goto out;
 414         }
 415
 416         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 417         if (ret != KRB5_KT_END && ret != ENOENT) {
 418                 while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
 419                         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 420                         ZERO_STRUCT(cursor);
 421                         if (ret) {
 422                                 DEBUG(1,("ads_keytab_flush: krb5_kt_end_seq_get() failed (%s)\n",error_message(ret)));
 423                                 goto out;
 424                         }
 425                         ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
 426                         if (ret) {
 427                                 DEBUG(1,("ads_keytab_flush: krb5_kt_remove_entry failed (%s)\n",error_message(ret)));
 428                                 goto out;
 429                         }
 430                         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 431                         if (ret) {
 432                                 DEBUG(1,("ads_keytab_flush: krb5_kt_start_seq failed (%s)\n",error_message(ret)));
 433                                 goto out;
 434                         }
 435                         ret = smb_krb5_kt_free_entry(context, &kt_entry);
 436                         ZERO_STRUCT(kt_entry);
 437                         if (ret) {
 438                                 DEBUG(1,("ads_keytab_flush: krb5_kt_remove_entry failed (%s)\n",error_message(ret)));
 439                                 goto out;
 440                         }
 441                 }
 442         }
 443
 444         /* Ensure we don't double free. */
 445         ZERO_STRUCT(kt_entry);
 446         ZERO_STRUCT(cursor);
 447
 448         if (!ADS_ERR_OK(ads_clear_service_principal_names(ads, global_myname()))) {
 449                 DEBUG(1,("ads_keytab_flush: Error while clearing service principal listings in LDAP.\n"));
 450                 goto out;
 451         }
 452
 453 out:
 454
 455         {
 456                 krb5_keytab_entry zero_kt_entry;
 457                 ZERO_STRUCT(zero_kt_entry);
 458                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 459                         smb_krb5_kt_free_entry(context, &kt_entry);
 460                 }
 461         }
 462         {
 463                 krb5_kt_cursor zero_csr;
 464                 ZERO_STRUCT(zero_csr);
 465                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 466                         krb5_kt_end_seq_get(context, keytab, &cursor);
 467                 }
 468         }
 469         if (keytab) {
 470                 krb5_kt_close(context, keytab);
 471         }
 472         if (context) {
 473                 krb5_free_context(context);
 474         }
 475         return ret;
 476 }
 477
 478 /**********************************************************************
 479  Adds all the required service principals to the system keytab.
 480 ***********************************************************************/
 481
 482 int ads_keytab_create_default(ADS_STRUCT *ads)
 483 {
 484         krb5_error_code ret = 0;
 485         krb5_context context = NULL;
 486         krb5_keytab keytab = NULL;
 487         krb5_kt_cursor cursor;
 488         krb5_keytab_entry kt_entry;
 489         krb5_kvno kvno;
 490         int i, found = 0;
 491         char *sam_account_name, *upn;
 492         char **oldEntries = NULL, *princ_s[26];
 493         TALLOC_CTX *ctx = NULL;
 494         fstring machine_name;
 495
 496         memset(princ_s, '\0', sizeof(princ_s));
 497
 498         fstrcpy( machine_name, global_myname() );
 499
 500         /* these are the main ones we need */
 501
 502         if ( (ret = ads_keytab_add_entry(ads, "host") ) != 0 ) {
 503                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding 'host'.\n"));
 504                 return ret;
 505         }
 506
 507
 508 #if 0   /* don't create the CIFS/... keytab entries since no one except smbd
 509            really needs them and we will fall back to verifying against secrets.tdb */
 510
 511         if ( (ret = ads_keytab_add_entry(ads, "cifs")) != 0 ) {
 512                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding 'cifs'.\n"));
 513                 return ret;
 514         }
 515 #endif
 516
 517         if ( (ctx = talloc_init("ads_keytab_create_default")) == NULL ) {
 518                 DEBUG(0,("ads_keytab_create_default: talloc() failed!\n"));
 519                 return -1;
 520         }
 521
 522         /* now add the userPrincipalName and sAMAccountName entries */
 523
 524         if ( (sam_account_name = ads_get_samaccountname( ads, ctx, machine_name)) == NULL ) {
 525                 DEBUG(0,("ads_keytab_add_entry: unable to determine machine account's name in AD!\n"));
 526                 TALLOC_FREE( ctx );
 527                 return -1;
 528         }
 529
 530         /* upper case the sAMAccountName to make it easier for apps to
 531            know what case to use in the keytab file */
 532
 533         strupper_m( sam_account_name );
 534
 535         if ( (ret = ads_keytab_add_entry(ads, sam_account_name )) != 0 ) {
 536                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding sAMAccountName (%s)\n",
 537                         sam_account_name));
 538                 return ret;
 539         }
 540
 541         /* remember that not every machine account will have a upn */
 542
 543         upn = ads_get_upn( ads, ctx, machine_name);
 544         if ( upn ) {
 545                 if ( (ret = ads_keytab_add_entry(ads, upn)) != 0 ) {
 546                         DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding UPN (%s)\n",
 547                                 upn));
 548                         TALLOC_FREE( ctx );
 549                         return ret;
 550                 }
 551         }
 552
 553         /* Now loop through the keytab and update any other existing entries... */
 554
 555         kvno = (krb5_kvno) ads_get_machine_kvno(ads, machine_name);
 556         if (kvno == -1) {
 557                 DEBUG(1,("ads_keytab_create_default: ads_get_machine_kvno failed to determine the system's kvno.\n"));
 558                 TALLOC_FREE(ctx);
 559                 return -1;
 560         }
 561
 562         DEBUG(3,("ads_keytab_create_default: Searching for keytab entries to "
 563                 "preserve and update.\n"));
 564
 565         ZERO_STRUCT(kt_entry);
 566         ZERO_STRUCT(cursor);
 567
 568         initialize_krb5_error_table();
 569         ret = krb5_init_context(&context);
 570         if (ret) {
 571                 DEBUG(1,("ads_keytab_create_default: could not krb5_init_context: %s\n",error_message(ret)));
 572                 TALLOC_FREE(ctx);
 573                 return ret;
 574         }
 575
 576         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 577         if (ret) {
 578                 DEBUG(1,("ads_keytab_create_default: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 579                 goto done;
 580         }
 581
 582         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 583         if (ret != KRB5_KT_END && ret != ENOENT ) {
 584                 while ((ret = krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) == 0) {
 585                         smb_krb5_kt_free_entry(context, &kt_entry);
 586                         ZERO_STRUCT(kt_entry);
 587                         found++;
 588                 }
 589         }
 590         krb5_kt_end_seq_get(context, keytab, &cursor);
 591         ZERO_STRUCT(cursor);
 592
 593         /*
 594          * Hmmm. There is no "rewind" function for the keytab. This means we have a race condition
 595          * where someone else could add entries after we've counted them. Re-open asap to minimise
 596          * the race. JRA.
 597          */
 598
 599         DEBUG(3, ("ads_keytab_create_default: Found %d entries in the keytab.\n", found));
 600         if (!found) {
 601                 goto done;
 602         }
 603         oldEntries = talloc_array(ctx, char *, found );
 604         if (!oldEntries) {
 605                 DEBUG(1,("ads_keytab_create_default: Failed to allocate space to store the old keytab entries (malloc failed?).\n"));
 606                 ret = -1;
 607                 goto done;
 608         }
 609         memset(oldEntries, '\0', found * sizeof(char *));
 610
 611         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 612         if (ret != KRB5_KT_END && ret != ENOENT ) {
 613                 while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 614                         if (kt_entry.vno != kvno) {
 615                                 char *ktprinc = NULL;
 616                                 char *p;
 617
 618                                 /* This returns a malloc'ed string in ktprinc. */
 619                                 ret = smb_krb5_unparse_name(oldEntries, context, kt_entry.principal, &ktprinc);
 620                                 if (ret) {
 621                                         DEBUG(1,("smb_krb5_unparse_name failed (%s)\n", error_message(ret)));
 622                                         goto done;
 623                                 }
 624                                 /*
 625                                  * From looking at the krb5 source they don't seem to take locale
 626                                  * or mb strings into account. Maybe this is because they assume utf8 ?
 627                                  * In this case we may need to convert from utf8 to mb charset here ? JRA.
 628                                  */
 629                                 p = strchr_m(ktprinc, '@');
 630                                 if (p) {
 631                                         *p = '\0';
 632                                 }
 633
 634                                 p = strchr_m(ktprinc, '/');
 635                                 if (p) {
 636                                         *p = '\0';
 637                                 }
 638                                 for (i = 0; i < found; i++) {
 639                                         if (!oldEntries[i]) {
 640                                                 oldEntries[i] = ktprinc;
 641                                                 break;
 642                                         }
 643                                         if (!strcmp(oldEntries[i], ktprinc)) {
 644                                                 TALLOC_FREE(ktprinc);
 645                                                 break;
 646                                         }
 647                                 }
 648                                 if (i == found) {
 649                                         TALLOC_FREE(ktprinc);
 650                                 }
 651                         }
 652                         smb_krb5_kt_free_entry(context, &kt_entry);
 653                         ZERO_STRUCT(kt_entry);
 654                 }
 655                 ret = 0;
 656                 for (i = 0; oldEntries[i]; i++) {
 657                         ret |= ads_keytab_add_entry(ads, oldEntries[i]);
 658                         TALLOC_FREE(oldEntries[i]);
 659                 }
 660                 krb5_kt_end_seq_get(context, keytab, &cursor);
 661         }
 662         ZERO_STRUCT(cursor);
 663
 664 done:
 665
 666         TALLOC_FREE(oldEntries);
 667         TALLOC_FREE(ctx);
 668
 669         {
 670                 krb5_keytab_entry zero_kt_entry;
 671                 ZERO_STRUCT(zero_kt_entry);
 672                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 673                         smb_krb5_kt_free_entry(context, &kt_entry);
 674                 }
 675         }
 676         {
 677                 krb5_kt_cursor zero_csr;
 678                 ZERO_STRUCT(zero_csr);
 679                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 680                         krb5_kt_end_seq_get(context, keytab, &cursor);
 681                 }
 682         }
 683         if (keytab) {
 684                 krb5_kt_close(context, keytab);
 685         }
 686         if (context) {
 687                 krb5_free_context(context);
 688         }
 689         return ret;
 690 }
 691
 692 /**********************************************************************
 693  List system keytab.
 694 ***********************************************************************/
 695
 696 int ads_keytab_list(const char *keytab_name)
 697 {
 698         krb5_error_code ret = 0;
 699         krb5_context context = NULL;
 700         krb5_keytab keytab = NULL;
 701         krb5_kt_cursor cursor;
 702         krb5_keytab_entry kt_entry;
 703
 704         ZERO_STRUCT(kt_entry);
 705         ZERO_STRUCT(cursor);
 706
 707         initialize_krb5_error_table();
 708         ret = krb5_init_context(&context);
 709         if (ret) {
 710                 DEBUG(1,("ads_keytab_list: could not krb5_init_context: %s\n",error_message(ret)));
 711                 return ret;
 712         }
 713
 714         ret = smb_krb5_open_keytab(context, keytab_name, False, &keytab);
 715         if (ret) {
 716                 DEBUG(1,("ads_keytab_list: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 717                 goto out;
 718         }
 719
 720         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 721         if (ret) {
 722                 goto out;
 723         }
 724
 725         printf("Vno  Type        Principal\n");
 726
 727         while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 728
 729                 char *princ_s = NULL;
 730                 char *etype_s = NULL;
 731                 krb5_enctype enctype = 0;
 732
 733                 ret = smb_krb5_unparse_name(talloc_tos(), context, kt_entry.principal, &princ_s);
 734                 if (ret) {
 735                         goto out;
 736                 }
 737
 738                 enctype = smb_get_enctype_from_kt_entry(&kt_entry);
 739
 740                 ret = smb_krb5_enctype_to_string(context, enctype, &etype_s);
 741                 if (ret) {
 742                         if (asprintf(&etype_s, "UNKNOWN: %d\n", enctype) == -1)
 743                         {
 744                                 TALLOC_FREE(princ_s);
 745                                 goto out;
 746                         }
 747                 }
 748
 749                 printf("%3d  %s\t\t %s\n", kt_entry.vno, etype_s, princ_s);
 750
 751                 TALLOC_FREE(princ_s);
 752                 SAFE_FREE(etype_s);
 753
 754                 ret = smb_krb5_kt_free_entry(context, &kt_entry);
 755                 if (ret) {
 756                         goto out;
 757                 }
 758         }
 759
 760         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 761         if (ret) {
 762                 goto out;
 763         }
 764
 765         /* Ensure we don't double free. */
 766         ZERO_STRUCT(kt_entry);
 767         ZERO_STRUCT(cursor);
 768 out:
 769
 770         {
 771                 krb5_keytab_entry zero_kt_entry;
 772                 ZERO_STRUCT(zero_kt_entry);
 773                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 774                         smb_krb5_kt_free_entry(context, &kt_entry);
 775                 }
 776         }
 777         {
 778                 krb5_kt_cursor zero_csr;
 779                 ZERO_STRUCT(zero_csr);
 780                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 781                         krb5_kt_end_seq_get(context, keytab, &cursor);
 782                 }
 783         }
 784
 785         if (keytab) {
 786                 krb5_kt_close(context, keytab);
 787         }
 788         if (context) {
 789                 krb5_free_context(context);
 790         }
 791         return ret;
 792 }
 793
 794 #endif /* HAVE_KRB5 */