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
  30 #ifdef HAVE_KRB5
  31
  32 /**********************************************************************
  33 **********************************************************************/
  34
  35 int smb_krb5_kt_add_entry_ext(krb5_context context,
  36                               krb5_keytab keytab,
  37                               krb5_kvno kvno,
  38                               const char *princ_s,
  39                               krb5_enctype *enctypes,
  40                               krb5_data password,
  41                               bool no_salt,
  42                               bool keep_old_entries)
  43 {
  44         krb5_error_code ret = 0;
  45         krb5_kt_cursor cursor;
  46         krb5_keytab_entry kt_entry;
  47         krb5_principal princ = NULL;
  48         int i;
  49         char *ktprinc = NULL;
  50
  51         ZERO_STRUCT(kt_entry);
  52         ZERO_STRUCT(cursor);
  53
  54         ret = smb_krb5_parse_name(context, princ_s, &princ);
  55         if (ret) {
  56                 DEBUG(1,("smb_krb5_kt_add_entry_ext: smb_krb5_parse_name(%s) failed (%s)\n", princ_s, error_message(ret)));
  57                 goto out;
  58         }
  59
  60         /* Seek and delete old keytab entries */
  61         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
  62         if (ret != KRB5_KT_END && ret != ENOENT ) {
  63                 DEBUG(3,("smb_krb5_kt_add_entry_ext: Will try to delete old keytab entries\n"));
  64                 while(!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
  65                         bool compare_name_ok = False;
  66
  67                         ret = smb_krb5_unparse_name(context, kt_entry.principal, &ktprinc);
  68                         if (ret) {
  69                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: smb_krb5_unparse_name failed (%s)\n",
  70                                         error_message(ret)));
  71                                 goto out;
  72                         }
  73
  74                         /*---------------------------------------------------------------------------
  75                          * Save the entries with kvno - 1.   This is what microsoft does
  76                          * to allow people with existing sessions that have kvno - 1 to still
  77                          * work.   Otherwise, when the password for the machine changes, all
  78                          * kerberizied sessions will 'break' until either the client reboots or
  79                          * the client's session key expires and they get a new session ticket
  80                          * with the new kvno.
  81                          */
  82
  83 #ifdef HAVE_KRB5_KT_COMPARE
  84                         compare_name_ok = (krb5_kt_compare(context, &kt_entry, princ, 0, 0) == True);
  85 #else
  86                         compare_name_ok = (strcmp(ktprinc, princ_s) == 0);
  87 #endif
  88
  89                         if (!compare_name_ok) {
  90                                 DEBUG(10,("smb_krb5_kt_add_entry_ext: ignoring keytab entry principal %s, kvno = %d\n",
  91                                         ktprinc, kt_entry.vno));
  92                         }
  93
  94                         SAFE_FREE(ktprinc);
  95
  96                         if (compare_name_ok) {
  97                                 if (kt_entry.vno == kvno - 1) {
  98                                         DEBUG(5,("smb_krb5_kt_add_entry_ext: Saving previous (kvno %d) entry for principal: %s.\n",
  99                                                 kvno - 1, princ_s));
 100                                 } else if (!keep_old_entries) {
 101                                         DEBUG(5,("smb_krb5_kt_add_entry_ext: Found old entry for principal: %s (kvno %d) - trying to remove it.\n",
 102                                                 princ_s, kt_entry.vno));
 103                                         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 104                                         ZERO_STRUCT(cursor);
 105                                         if (ret) {
 106                                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: krb5_kt_end_seq_get() failed (%s)\n",
 107                                                         error_message(ret)));
 108                                                 goto out;
 109                                         }
 110                                         ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
 111                                         if (ret) {
 112                                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: krb5_kt_remove_entry failed (%s)\n",
 113                                                         error_message(ret)));
 114                                                 goto out;
 115                                         }
 116
 117                                         DEBUG(5,("smb_krb5_kt_add_entry_ext: removed old entry for principal: %s (kvno %d).\n",
 118                                                 princ_s, kt_entry.vno));
 119
 120                                         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 121                                         if (ret) {
 122                                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: krb5_kt_start_seq failed (%s)\n",
 123                                                         error_message(ret)));
 124                                                 goto out;
 125                                         }
 126                                         ret = smb_krb5_kt_free_entry(context, &kt_entry);
 127                                         ZERO_STRUCT(kt_entry);
 128                                         if (ret) {
 129                                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: krb5_kt_remove_entry failed (%s)\n",
 130                                                         error_message(ret)));
 131                                                 goto out;
 132                                         }
 133                                         continue;
 134                                 }
 135                         }
 136
 137                         /* Not a match, just free this entry and continue. */
 138                         ret = smb_krb5_kt_free_entry(context, &kt_entry);
 139                         ZERO_STRUCT(kt_entry);
 140                         if (ret) {
 141                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: smb_krb5_kt_free_entry failed (%s)\n", error_message(ret)));
 142                                 goto out;
 143                         }
 144                 }
 145
 146                 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 147                 ZERO_STRUCT(cursor);
 148                 if (ret) {
 149                         DEBUG(1,("smb_krb5_kt_add_entry_ext: krb5_kt_end_seq_get failed (%s)\n",error_message(ret)));
 150                         goto out;
 151                 }
 152         }
 153
 154         /* Ensure we don't double free. */
 155         ZERO_STRUCT(kt_entry);
 156         ZERO_STRUCT(cursor);
 157
 158         /* If we get here, we have deleted all the old entries with kvno's not equal to the current kvno-1. */
 159
 160         /* Now add keytab entries for all encryption types */
 161         for (i = 0; enctypes[i]; i++) {
 162                 krb5_keyblock *keyp;
 163
 164 #if !defined(HAVE_KRB5_KEYTAB_ENTRY_KEY) && !defined(HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK)
 165 #error krb5_keytab_entry has no key or keyblock member
 166 #endif
 167 #ifdef HAVE_KRB5_KEYTAB_ENTRY_KEY               /* MIT */
 168                 keyp = &kt_entry.key;
 169 #endif
 170 #ifdef HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK          /* Heimdal */
 171                 keyp = &kt_entry.keyblock;
 172 #endif
 173                 if (create_kerberos_key_from_string(context, princ, &password, keyp, enctypes[i], no_salt)) {
 174                         continue;
 175                 }
 176
 177                 kt_entry.principal = princ;
 178                 kt_entry.vno       = kvno;
 179
 180                 DEBUG(3,("smb_krb5_kt_add_entry_ext: adding keytab entry for (%s) with encryption type (%d) and version (%d)\n",
 181                         princ_s, enctypes[i], kt_entry.vno));
 182                 ret = krb5_kt_add_entry(context, keytab, &kt_entry);
 183                 krb5_free_keyblock_contents(context, keyp);
 184                 ZERO_STRUCT(kt_entry);
 185                 if (ret) {
 186                         DEBUG(1,("smb_krb5_kt_add_entry_ext: adding entry to keytab failed (%s)\n", error_message(ret)));
 187                         goto out;
 188                 }
 189         }
 190
 191
 192 out:
 193         {
 194                 krb5_keytab_entry zero_kt_entry;
 195                 ZERO_STRUCT(zero_kt_entry);
 196                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 197                         smb_krb5_kt_free_entry(context, &kt_entry);
 198                 }
 199         }
 200         if (princ) {
 201                 krb5_free_principal(context, princ);
 202         }
 203
 204         {
 205                 krb5_kt_cursor zero_csr;
 206                 ZERO_STRUCT(zero_csr);
 207                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 208                         krb5_kt_end_seq_get(context, keytab, &cursor);
 209                 }
 210         }
 211
 212         return (int)ret;
 213 }
 214
 215 static int smb_krb5_kt_add_entry(krb5_context context,
 216                                  krb5_keytab keytab,
 217                                  krb5_kvno kvno,
 218                                  const char *princ_s,
 219                                  krb5_enctype *enctypes,
 220                                  krb5_data password)
 221 {
 222         return smb_krb5_kt_add_entry_ext(context,
 223                                          keytab,
 224                                          kvno,
 225                                          princ_s,
 226                                          enctypes,
 227                                          password,
 228                                          false,
 229                                          false);
 230 }
 231
 232 /**********************************************************************
 233  Adds a single service principal, i.e. 'host' to the system keytab
 234 ***********************************************************************/
 235
 236 int ads_keytab_add_entry(ADS_STRUCT *ads, const char *srvPrinc)
 237 {
 238         krb5_error_code ret = 0;
 239         krb5_context context = NULL;
 240         krb5_keytab keytab = NULL;
 241         krb5_data password;
 242         krb5_kvno kvno;
 243         krb5_enctype enctypes[4] = { ENCTYPE_DES_CBC_CRC, ENCTYPE_DES_CBC_MD5, 0, 0 };
 244         char *princ_s = NULL, *short_princ_s = NULL;
 245         char *password_s = NULL;
 246         char *my_fqdn;
 247         TALLOC_CTX *ctx = NULL;
 248         char *machine_name;
 249
 250 #if defined(ENCTYPE_ARCFOUR_HMAC)
 251         enctypes[2] = ENCTYPE_ARCFOUR_HMAC;
 252 #endif
 253
 254         initialize_krb5_error_table();
 255         ret = krb5_init_context(&context);
 256         if (ret) {
 257                 DEBUG(1,("ads_keytab_add_entry: could not krb5_init_context: %s\n",error_message(ret)));
 258                 return -1;
 259         }
 260
 261         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 262         if (ret) {
 263                 DEBUG(1,("ads_keytab_add_entry: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 264                 goto out;
 265         }
 266
 267         /* retrieve the password */
 268         if (!secrets_init()) {
 269                 DEBUG(1,("ads_keytab_add_entry: secrets_init failed\n"));
 270                 ret = -1;
 271                 goto out;
 272         }
 273         password_s = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
 274         if (!password_s) {
 275                 DEBUG(1,("ads_keytab_add_entry: failed to fetch machine password\n"));
 276                 ret = -1;
 277                 goto out;
 278         }
 279         password.data = password_s;
 280         password.length = strlen(password_s);
 281
 282         /* we need the dNSHostName value here */
 283
 284         if ( (ctx = talloc_init("ads_keytab_add_entry")) == NULL ) {
 285                 DEBUG(0,("ads_keytab_add_entry: talloc() failed!\n"));
 286                 ret = -1;
 287                 goto out;
 288         }
 289
 290         if ( (my_fqdn = ads_get_dnshostname( ads, ctx, global_myname())) == NULL ) {
 291                 DEBUG(0,("ads_keytab_add_entry: unable to determine machine account's dns name in AD!\n"));
 292                 ret = -1;
 293                 goto out;
 294         }
 295
 296         if ( (machine_name = ads_get_samaccountname( ads, ctx, global_myname())) == NULL ) {
 297                 DEBUG(0,("ads_keytab_add_entry: unable to determine machine account's short name in AD!\n"));
 298                 ret = -1;
 299                 goto out;
 300         }
 301         /*strip the trailing '$' */
 302         machine_name[strlen(machine_name)-1] = '\0';
 303
 304         /* Construct our principal */
 305
 306         if (strchr_m(srvPrinc, '@')) {
 307                 /* It's a fully-named principal. */
 308                 asprintf(&princ_s, "%s", srvPrinc);
 309         } else if (srvPrinc[strlen(srvPrinc)-1] == '$') {
 310                 /* It's the machine account, as used by smbclient clients. */
 311                 asprintf(&princ_s, "%s@%s", srvPrinc, lp_realm());
 312         } else {
 313                 /* It's a normal service principal.  Add the SPN now so that we
 314                  * can obtain credentials for it and double-check the salt value
 315                  * used to generate the service's keys. */
 316
 317                 asprintf(&princ_s, "%s/%s@%s", srvPrinc, my_fqdn, lp_realm());
 318                 asprintf(&short_princ_s, "%s/%s@%s", srvPrinc, machine_name, lp_realm());
 319
 320                 /* According to http://support.microsoft.com/kb/326985/en-us,
 321                    certain principal names are automatically mapped to the host/...
 322                    principal in the AD account.  So only create these in the
 323                    keytab, not in AD.  --jerry */
 324
 325                 if ( !strequal( srvPrinc, "cifs" ) && !strequal(srvPrinc, "host" ) ) {
 326                         DEBUG(3,("ads_keytab_add_entry: Attempting to add/update '%s'\n", princ_s));
 327
 328                         if (!ADS_ERR_OK(ads_add_service_principal_name(ads, global_myname(), my_fqdn, srvPrinc))) {
 329                                 DEBUG(1,("ads_keytab_add_entry: ads_add_service_principal_name failed.\n"));
 330                                 goto out;
 331                         }
 332                 }
 333         }
 334
 335         kvno = (krb5_kvno) ads_get_machine_kvno(ads, global_myname());
 336         if (kvno == -1) {       /* -1 indicates failure, everything else is OK */
 337                 DEBUG(1,("ads_keytab_add_entry: ads_get_machine_kvno failed to determine the system's kvno.\n"));
 338                 ret = -1;
 339                 goto out;
 340         }
 341
 342         /* add the fqdn principal to the keytab */
 343
 344         ret = smb_krb5_kt_add_entry( context, keytab, kvno, princ_s, enctypes, password );
 345         if ( ret ) {
 346                 DEBUG(1,("ads_keytab_add_entry: Failed to add entry to keytab file\n"));
 347                 goto out;
 348         }
 349
 350         /* add the short principal name if we have one */
 351
 352         if ( short_princ_s ) {
 353                 ret = smb_krb5_kt_add_entry( context, keytab, kvno, short_princ_s, enctypes, password );
 354                 if ( ret ) {
 355                         DEBUG(1,("ads_keytab_add_entry: Failed to add short entry to keytab file\n"));
 356                         goto out;
 357                 }
 358         }
 359
 360 out:
 361         SAFE_FREE( princ_s );
 362         SAFE_FREE( short_princ_s );
 363         TALLOC_FREE( ctx );
 364
 365         if (keytab) {
 366                 krb5_kt_close(context, keytab);
 367         }
 368         if (context) {
 369                 krb5_free_context(context);
 370         }
 371         return (int)ret;
 372 }
 373
 374 /**********************************************************************
 375  Flushes all entries from the system keytab.
 376 ***********************************************************************/
 377
 378 int ads_keytab_flush(ADS_STRUCT *ads)
 379 {
 380         krb5_error_code ret = 0;
 381         krb5_context context = NULL;
 382         krb5_keytab keytab = NULL;
 383         krb5_kt_cursor cursor;
 384         krb5_keytab_entry kt_entry;
 385         krb5_kvno kvno;
 386
 387         ZERO_STRUCT(kt_entry);
 388         ZERO_STRUCT(cursor);
 389
 390         initialize_krb5_error_table();
 391         ret = krb5_init_context(&context);
 392         if (ret) {
 393                 DEBUG(1,("ads_keytab_flush: could not krb5_init_context: %s\n",error_message(ret)));
 394                 return ret;
 395         }
 396
 397         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 398         if (ret) {
 399                 DEBUG(1,("ads_keytab_flush: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 400                 goto out;
 401         }
 402
 403         kvno = (krb5_kvno) ads_get_machine_kvno(ads, global_myname());
 404         if (kvno == -1) {       /* -1 indicates a failure */
 405                 DEBUG(1,("ads_keytab_flush: Error determining the system's kvno.\n"));
 406                 goto out;
 407         }
 408
 409         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 410         if (ret != KRB5_KT_END && ret != ENOENT) {
 411                 while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
 412                         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 413                         ZERO_STRUCT(cursor);
 414                         if (ret) {
 415                                 DEBUG(1,("ads_keytab_flush: krb5_kt_end_seq_get() failed (%s)\n",error_message(ret)));
 416                                 goto out;
 417                         }
 418                         ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
 419                         if (ret) {
 420                                 DEBUG(1,("ads_keytab_flush: krb5_kt_remove_entry failed (%s)\n",error_message(ret)));
 421                                 goto out;
 422                         }
 423                         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 424                         if (ret) {
 425                                 DEBUG(1,("ads_keytab_flush: krb5_kt_start_seq failed (%s)\n",error_message(ret)));
 426                                 goto out;
 427                         }
 428                         ret = smb_krb5_kt_free_entry(context, &kt_entry);
 429                         ZERO_STRUCT(kt_entry);
 430                         if (ret) {
 431                                 DEBUG(1,("ads_keytab_flush: krb5_kt_remove_entry failed (%s)\n",error_message(ret)));
 432                                 goto out;
 433                         }
 434                 }
 435         }
 436
 437         /* Ensure we don't double free. */
 438         ZERO_STRUCT(kt_entry);
 439         ZERO_STRUCT(cursor);
 440
 441         if (!ADS_ERR_OK(ads_clear_service_principal_names(ads, global_myname()))) {
 442                 DEBUG(1,("ads_keytab_flush: Error while clearing service principal listings in LDAP.\n"));
 443                 goto out;
 444         }
 445
 446 out:
 447
 448         {
 449                 krb5_keytab_entry zero_kt_entry;
 450                 ZERO_STRUCT(zero_kt_entry);
 451                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 452                         smb_krb5_kt_free_entry(context, &kt_entry);
 453                 }
 454         }
 455         {
 456                 krb5_kt_cursor zero_csr;
 457                 ZERO_STRUCT(zero_csr);
 458                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 459                         krb5_kt_end_seq_get(context, keytab, &cursor);
 460                 }
 461         }
 462         if (keytab) {
 463                 krb5_kt_close(context, keytab);
 464         }
 465         if (context) {
 466                 krb5_free_context(context);
 467         }
 468         return ret;
 469 }
 470
 471 /**********************************************************************
 472  Adds all the required service principals to the system keytab.
 473 ***********************************************************************/
 474
 475 int ads_keytab_create_default(ADS_STRUCT *ads)
 476 {
 477         krb5_error_code ret = 0;
 478         krb5_context context = NULL;
 479         krb5_keytab keytab = NULL;
 480         krb5_kt_cursor cursor;
 481         krb5_keytab_entry kt_entry;
 482         krb5_kvno kvno;
 483         int i, found = 0;
 484         char *sam_account_name, *upn;
 485         char **oldEntries = NULL, *princ_s[26];
 486         TALLOC_CTX *ctx = NULL;
 487         fstring machine_name;
 488
 489         memset(princ_s, '\0', sizeof(princ_s));
 490
 491         fstrcpy( machine_name, global_myname() );
 492
 493         /* these are the main ones we need */
 494
 495         if ( (ret = ads_keytab_add_entry(ads, "host") ) != 0 ) {
 496                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding 'host'.\n"));
 497                 return ret;
 498         }
 499
 500
 501 #if 0   /* don't create the CIFS/... keytab entries since no one except smbd
 502            really needs them and we will fall back to verifying against secrets.tdb */
 503
 504         if ( (ret = ads_keytab_add_entry(ads, "cifs")) != 0 ) {
 505                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding 'cifs'.\n"));
 506                 return ret;
 507         }
 508 #endif
 509
 510         if ( (ctx = talloc_init("ads_keytab_create_default")) == NULL ) {
 511                 DEBUG(0,("ads_keytab_create_default: talloc() failed!\n"));
 512                 return -1;
 513         }
 514
 515         /* now add the userPrincipalName and sAMAccountName entries */
 516
 517         if ( (sam_account_name = ads_get_samaccountname( ads, ctx, machine_name)) == NULL ) {
 518                 DEBUG(0,("ads_keytab_add_entry: unable to determine machine account's name in AD!\n"));
 519                 TALLOC_FREE( ctx );
 520                 return -1;
 521         }
 522
 523         /* upper case the sAMAccountName to make it easier for apps to
 524            know what case to use in the keytab file */
 525
 526         strupper_m( sam_account_name );
 527
 528         if ( (ret = ads_keytab_add_entry(ads, sam_account_name )) != 0 ) {
 529                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding sAMAccountName (%s)\n",
 530                         sam_account_name));
 531                 return ret;
 532         }
 533
 534         /* remember that not every machine account will have a upn */
 535
 536         upn = ads_get_upn( ads, ctx, machine_name);
 537         if ( upn ) {
 538                 if ( (ret = ads_keytab_add_entry(ads, upn)) != 0 ) {
 539                         DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding UPN (%s)\n",
 540                                 upn));
 541                         TALLOC_FREE( ctx );
 542                         return ret;
 543                 }
 544         }
 545
 546         TALLOC_FREE( ctx );
 547
 548         /* Now loop through the keytab and update any other existing entries... */
 549
 550         kvno = (krb5_kvno) ads_get_machine_kvno(ads, machine_name);
 551         if (kvno == -1) {
 552                 DEBUG(1,("ads_keytab_create_default: ads_get_machine_kvno failed to determine the system's kvno.\n"));
 553                 return -1;
 554         }
 555
 556         DEBUG(3,("ads_keytab_create_default: Searching for keytab entries to "
 557                 "preserve and update.\n"));
 558
 559         ZERO_STRUCT(kt_entry);
 560         ZERO_STRUCT(cursor);
 561
 562         initialize_krb5_error_table();
 563         ret = krb5_init_context(&context);
 564         if (ret) {
 565                 DEBUG(1,("ads_keytab_create_default: could not krb5_init_context: %s\n",error_message(ret)));
 566                 return ret;
 567         }
 568
 569         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 570         if (ret) {
 571                 DEBUG(1,("ads_keytab_create_default: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 572                 goto done;
 573         }
 574
 575         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 576         if (ret != KRB5_KT_END && ret != ENOENT ) {
 577                 while ((ret = krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) == 0) {
 578                         smb_krb5_kt_free_entry(context, &kt_entry);
 579                         ZERO_STRUCT(kt_entry);
 580                         found++;
 581                 }
 582         }
 583         krb5_kt_end_seq_get(context, keytab, &cursor);
 584         ZERO_STRUCT(cursor);
 585
 586         /*
 587          * Hmmm. There is no "rewind" function for the keytab. This means we have a race condition
 588          * where someone else could add entries after we've counted them. Re-open asap to minimise
 589          * the race. JRA.
 590          */
 591
 592         DEBUG(3, ("ads_keytab_create_default: Found %d entries in the keytab.\n", found));
 593         if (!found) {
 594                 goto done;
 595         }
 596         oldEntries = SMB_MALLOC_ARRAY(char *, found );
 597         if (!oldEntries) {
 598                 DEBUG(1,("ads_keytab_create_default: Failed to allocate space to store the old keytab entries (malloc failed?).\n"));
 599                 ret = -1;
 600                 goto done;
 601         }
 602         memset(oldEntries, '\0', found * sizeof(char *));
 603
 604         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 605         if (ret != KRB5_KT_END && ret != ENOENT ) {
 606                 while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 607                         if (kt_entry.vno != kvno) {
 608                                 char *ktprinc = NULL;
 609                                 char *p;
 610
 611                                 /* This returns a malloc'ed string in ktprinc. */
 612                                 ret = smb_krb5_unparse_name(context, kt_entry.principal, &ktprinc);
 613                                 if (ret) {
 614                                         DEBUG(1,("smb_krb5_unparse_name failed (%s)\n", error_message(ret)));
 615                                         goto done;
 616                                 }
 617                                 /*
 618                                  * From looking at the krb5 source they don't seem to take locale
 619                                  * or mb strings into account. Maybe this is because they assume utf8 ?
 620                                  * In this case we may need to convert from utf8 to mb charset here ? JRA.
 621                                  */
 622                                 p = strchr_m(ktprinc, '@');
 623                                 if (p) {
 624                                         *p = '\0';
 625                                 }
 626
 627                                 p = strchr_m(ktprinc, '/');
 628                                 if (p) {
 629                                         *p = '\0';
 630                                 }
 631                                 for (i = 0; i < found; i++) {
 632                                         if (!oldEntries[i]) {
 633                                                 oldEntries[i] = ktprinc;
 634                                                 break;
 635                                         }
 636                                         if (!strcmp(oldEntries[i], ktprinc)) {
 637                                                 SAFE_FREE(ktprinc);
 638                                                 break;
 639                                         }
 640                                 }
 641                                 if (i == found) {
 642                                         SAFE_FREE(ktprinc);
 643                                 }
 644                         }
 645                         smb_krb5_kt_free_entry(context, &kt_entry);
 646                         ZERO_STRUCT(kt_entry);
 647                 }
 648                 ret = 0;
 649                 for (i = 0; oldEntries[i]; i++) {
 650                         ret |= ads_keytab_add_entry(ads, oldEntries[i]);
 651                         SAFE_FREE(oldEntries[i]);
 652                 }
 653                 krb5_kt_end_seq_get(context, keytab, &cursor);
 654         }
 655         ZERO_STRUCT(cursor);
 656
 657 done:
 658
 659         SAFE_FREE(oldEntries);
 660
 661         {
 662                 krb5_keytab_entry zero_kt_entry;
 663                 ZERO_STRUCT(zero_kt_entry);
 664                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 665                         smb_krb5_kt_free_entry(context, &kt_entry);
 666                 }
 667         }
 668         {
 669                 krb5_kt_cursor zero_csr;
 670                 ZERO_STRUCT(zero_csr);
 671                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 672                         krb5_kt_end_seq_get(context, keytab, &cursor);
 673                 }
 674         }
 675         if (keytab) {
 676                 krb5_kt_close(context, keytab);
 677         }
 678         if (context) {
 679                 krb5_free_context(context);
 680         }
 681         return ret;
 682 }
 683
 684 /**********************************************************************
 685  List system keytab.
 686 ***********************************************************************/
 687
 688 int ads_keytab_list(const char *keytab_name)
 689 {
 690         krb5_error_code ret = 0;
 691         krb5_context context = NULL;
 692         krb5_keytab keytab = NULL;
 693         krb5_kt_cursor cursor;
 694         krb5_keytab_entry kt_entry;
 695
 696         ZERO_STRUCT(kt_entry);
 697         ZERO_STRUCT(cursor);
 698
 699         initialize_krb5_error_table();
 700         ret = krb5_init_context(&context);
 701         if (ret) {
 702                 DEBUG(1,("ads_keytab_list: could not krb5_init_context: %s\n",error_message(ret)));
 703                 return ret;
 704         }
 705
 706         ret = smb_krb5_open_keytab(context, keytab_name, False, &keytab);
 707         if (ret) {
 708                 DEBUG(1,("ads_keytab_list: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 709                 goto out;
 710         }
 711
 712         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 713         if (ret) {
 714                 goto out;
 715         }
 716
 717         printf("Vno  Type        Principal\n");
 718
 719         while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 720
 721                 char *princ_s = NULL;
 722                 char *etype_s = NULL;
 723                 krb5_enctype enctype = 0;
 724
 725                 ret = smb_krb5_unparse_name(context, kt_entry.principal, &princ_s);
 726                 if (ret) {
 727                         goto out;
 728                 }
 729
 730                 enctype = smb_get_enctype_from_kt_entry(&kt_entry);
 731
 732                 ret = smb_krb5_enctype_to_string(context, enctype, &etype_s);
 733                 if (ret) {
 734                         SAFE_FREE(princ_s);
 735                         goto out;
 736                 }
 737
 738                 printf("%3d  %s\t\t %s\n", kt_entry.vno, etype_s, princ_s);
 739
 740                 SAFE_FREE(princ_s);
 741                 SAFE_FREE(etype_s);
 742
 743                 ret = smb_krb5_kt_free_entry(context, &kt_entry);
 744                 if (ret) {
 745                         goto out;
 746                 }
 747         }
 748
 749         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 750         if (ret) {
 751                 goto out;
 752         }
 753
 754         /* Ensure we don't double free. */
 755         ZERO_STRUCT(kt_entry);
 756         ZERO_STRUCT(cursor);
 757 out:
 758
 759         {
 760                 krb5_keytab_entry zero_kt_entry;
 761                 ZERO_STRUCT(zero_kt_entry);
 762                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 763                         smb_krb5_kt_free_entry(context, &kt_entry);
 764                 }
 765         }
 766         {
 767                 krb5_kt_cursor zero_csr;
 768                 ZERO_STRUCT(zero_csr);
 769                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 770                         krb5_kt_end_seq_get(context, keytab, &cursor);
 771                 }
 772         }
 773
 774         if (keytab) {
 775                 krb5_kt_close(context, keytab);
 776         }
 777         if (context) {
 778                 krb5_free_context(context);
 779         }
 780         return ret;
 781 }
 782
 783 #endif /* HAVE_KRB5 */