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         ZERO_STRUCT(password);
 280         password.data = password_s;
 281         password.length = strlen(password_s);
 282
 283         /* we need the dNSHostName value here */
 284
 285         if ( (ctx = talloc_init("ads_keytab_add_entry")) == NULL ) {
 286                 DEBUG(0,("ads_keytab_add_entry: talloc() failed!\n"));
 287                 ret = -1;
 288                 goto out;
 289         }
 290
 291         if ( (my_fqdn = ads_get_dnshostname( ads, ctx, global_myname())) == NULL ) {
 292                 DEBUG(0,("ads_keytab_add_entry: unable to determine machine account's dns name in AD!\n"));
 293                 ret = -1;
 294                 goto out;
 295         }
 296
 297         if ( (machine_name = ads_get_samaccountname( ads, ctx, global_myname())) == NULL ) {
 298                 DEBUG(0,("ads_keytab_add_entry: unable to determine machine account's short name in AD!\n"));
 299                 ret = -1;
 300                 goto out;
 301         }
 302         /*strip the trailing '$' */
 303         machine_name[strlen(machine_name)-1] = '\0';
 304
 305         /* Construct our principal */
 306
 307         if (strchr_m(srvPrinc, '@')) {
 308                 /* It's a fully-named principal. */
 309                 asprintf(&princ_s, "%s", srvPrinc);
 310         } else if (srvPrinc[strlen(srvPrinc)-1] == '$') {
 311                 /* It's the machine account, as used by smbclient clients. */
 312                 asprintf(&princ_s, "%s@%s", srvPrinc, lp_realm());
 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                 asprintf(&princ_s, "%s/%s@%s", srvPrinc, my_fqdn, lp_realm());
 319                 asprintf(&short_princ_s, "%s/%s@%s", srvPrinc, machine_name, lp_realm());
 320
 321                 /* According to http://support.microsoft.com/kb/326985/en-us,
 322                    certain principal names are automatically mapped to the host/...
 323                    principal in the AD account.  So only create these in the
 324                    keytab, not in AD.  --jerry */
 325
 326                 if ( !strequal( srvPrinc, "cifs" ) && !strequal(srvPrinc, "host" ) ) {
 327                         DEBUG(3,("ads_keytab_add_entry: Attempting to add/update '%s'\n", princ_s));
 328
 329                         if (!ADS_ERR_OK(ads_add_service_principal_name(ads, global_myname(), my_fqdn, srvPrinc))) {
 330                                 DEBUG(1,("ads_keytab_add_entry: ads_add_service_principal_name failed.\n"));
 331                                 goto out;
 332                         }
 333                 }
 334         }
 335
 336         kvno = (krb5_kvno) ads_get_machine_kvno(ads, global_myname());
 337         if (kvno == -1) {       /* -1 indicates failure, everything else is OK */
 338                 DEBUG(1,("ads_keytab_add_entry: ads_get_machine_kvno failed to determine the system's kvno.\n"));
 339                 ret = -1;
 340                 goto out;
 341         }
 342
 343         /* add the fqdn principal to the keytab */
 344
 345         ret = smb_krb5_kt_add_entry( context, keytab, kvno, princ_s, enctypes, password );
 346         if ( ret ) {
 347                 DEBUG(1,("ads_keytab_add_entry: Failed to add entry to keytab file\n"));
 348                 goto out;
 349         }
 350
 351         /* add the short principal name if we have one */
 352
 353         if ( short_princ_s ) {
 354                 ret = smb_krb5_kt_add_entry( context, keytab, kvno, short_princ_s, enctypes, password );
 355                 if ( ret ) {
 356                         DEBUG(1,("ads_keytab_add_entry: Failed to add short entry to keytab file\n"));
 357                         goto out;
 358                 }
 359         }
 360
 361 out:
 362         SAFE_FREE( princ_s );
 363         SAFE_FREE( short_princ_s );
 364         TALLOC_FREE( ctx );
 365
 366         if (keytab) {
 367                 krb5_kt_close(context, keytab);
 368         }
 369         if (context) {
 370                 krb5_free_context(context);
 371         }
 372         return (int)ret;
 373 }
 374
 375 /**********************************************************************
 376  Flushes all entries from the system keytab.
 377 ***********************************************************************/
 378
 379 int ads_keytab_flush(ADS_STRUCT *ads)
 380 {
 381         krb5_error_code ret = 0;
 382         krb5_context context = NULL;
 383         krb5_keytab keytab = NULL;
 384         krb5_kt_cursor cursor;
 385         krb5_keytab_entry kt_entry;
 386         krb5_kvno kvno;
 387
 388         ZERO_STRUCT(kt_entry);
 389         ZERO_STRUCT(cursor);
 390
 391         initialize_krb5_error_table();
 392         ret = krb5_init_context(&context);
 393         if (ret) {
 394                 DEBUG(1,("ads_keytab_flush: could not krb5_init_context: %s\n",error_message(ret)));
 395                 return ret;
 396         }
 397
 398         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 399         if (ret) {
 400                 DEBUG(1,("ads_keytab_flush: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 401                 goto out;
 402         }
 403
 404         kvno = (krb5_kvno) ads_get_machine_kvno(ads, global_myname());
 405         if (kvno == -1) {       /* -1 indicates a failure */
 406                 DEBUG(1,("ads_keytab_flush: Error determining the system's kvno.\n"));
 407                 goto out;
 408         }
 409
 410         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 411         if (ret != KRB5_KT_END && ret != ENOENT) {
 412                 while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
 413                         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 414                         ZERO_STRUCT(cursor);
 415                         if (ret) {
 416                                 DEBUG(1,("ads_keytab_flush: krb5_kt_end_seq_get() failed (%s)\n",error_message(ret)));
 417                                 goto out;
 418                         }
 419                         ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
 420                         if (ret) {
 421                                 DEBUG(1,("ads_keytab_flush: krb5_kt_remove_entry failed (%s)\n",error_message(ret)));
 422                                 goto out;
 423                         }
 424                         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 425                         if (ret) {
 426                                 DEBUG(1,("ads_keytab_flush: krb5_kt_start_seq failed (%s)\n",error_message(ret)));
 427                                 goto out;
 428                         }
 429                         ret = smb_krb5_kt_free_entry(context, &kt_entry);
 430                         ZERO_STRUCT(kt_entry);
 431                         if (ret) {
 432                                 DEBUG(1,("ads_keytab_flush: krb5_kt_remove_entry failed (%s)\n",error_message(ret)));
 433                                 goto out;
 434                         }
 435                 }
 436         }
 437
 438         /* Ensure we don't double free. */
 439         ZERO_STRUCT(kt_entry);
 440         ZERO_STRUCT(cursor);
 441
 442         if (!ADS_ERR_OK(ads_clear_service_principal_names(ads, global_myname()))) {
 443                 DEBUG(1,("ads_keytab_flush: Error while clearing service principal listings in LDAP.\n"));
 444                 goto out;
 445         }
 446
 447 out:
 448
 449         {
 450                 krb5_keytab_entry zero_kt_entry;
 451                 ZERO_STRUCT(zero_kt_entry);
 452                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 453                         smb_krb5_kt_free_entry(context, &kt_entry);
 454                 }
 455         }
 456         {
 457                 krb5_kt_cursor zero_csr;
 458                 ZERO_STRUCT(zero_csr);
 459                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 460                         krb5_kt_end_seq_get(context, keytab, &cursor);
 461                 }
 462         }
 463         if (keytab) {
 464                 krb5_kt_close(context, keytab);
 465         }
 466         if (context) {
 467                 krb5_free_context(context);
 468         }
 469         return ret;
 470 }
 471
 472 /**********************************************************************
 473  Adds all the required service principals to the system keytab.
 474 ***********************************************************************/
 475
 476 int ads_keytab_create_default(ADS_STRUCT *ads)
 477 {
 478         krb5_error_code ret = 0;
 479         krb5_context context = NULL;
 480         krb5_keytab keytab = NULL;
 481         krb5_kt_cursor cursor;
 482         krb5_keytab_entry kt_entry;
 483         krb5_kvno kvno;
 484         int i, found = 0;
 485         char *sam_account_name, *upn;
 486         char **oldEntries = NULL, *princ_s[26];
 487         TALLOC_CTX *ctx = NULL;
 488         fstring machine_name;
 489
 490         memset(princ_s, '\0', sizeof(princ_s));
 491
 492         fstrcpy( machine_name, global_myname() );
 493
 494         /* these are the main ones we need */
 495
 496         if ( (ret = ads_keytab_add_entry(ads, "host") ) != 0 ) {
 497                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding 'host'.\n"));
 498                 return ret;
 499         }
 500
 501
 502 #if 0   /* don't create the CIFS/... keytab entries since no one except smbd
 503            really needs them and we will fall back to verifying against secrets.tdb */
 504
 505         if ( (ret = ads_keytab_add_entry(ads, "cifs")) != 0 ) {
 506                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding 'cifs'.\n"));
 507                 return ret;
 508         }
 509 #endif
 510
 511         if ( (ctx = talloc_init("ads_keytab_create_default")) == NULL ) {
 512                 DEBUG(0,("ads_keytab_create_default: talloc() failed!\n"));
 513                 return -1;
 514         }
 515
 516         /* now add the userPrincipalName and sAMAccountName entries */
 517
 518         if ( (sam_account_name = ads_get_samaccountname( ads, ctx, machine_name)) == NULL ) {
 519                 DEBUG(0,("ads_keytab_add_entry: unable to determine machine account's name in AD!\n"));
 520                 TALLOC_FREE( ctx );
 521                 return -1;
 522         }
 523
 524         /* upper case the sAMAccountName to make it easier for apps to
 525            know what case to use in the keytab file */
 526
 527         strupper_m( sam_account_name );
 528
 529         if ( (ret = ads_keytab_add_entry(ads, sam_account_name )) != 0 ) {
 530                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding sAMAccountName (%s)\n",
 531                         sam_account_name));
 532                 return ret;
 533         }
 534
 535         /* remember that not every machine account will have a upn */
 536
 537         upn = ads_get_upn( ads, ctx, machine_name);
 538         if ( upn ) {
 539                 if ( (ret = ads_keytab_add_entry(ads, upn)) != 0 ) {
 540                         DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding UPN (%s)\n",
 541                                 upn));
 542                         TALLOC_FREE( ctx );
 543                         return ret;
 544                 }
 545         }
 546
 547         TALLOC_FREE( ctx );
 548
 549         /* Now loop through the keytab and update any other existing entries... */
 550
 551         kvno = (krb5_kvno) ads_get_machine_kvno(ads, machine_name);
 552         if (kvno == -1) {
 553                 DEBUG(1,("ads_keytab_create_default: ads_get_machine_kvno failed to determine the system's kvno.\n"));
 554                 return -1;
 555         }
 556
 557         DEBUG(3,("ads_keytab_create_default: Searching for keytab entries to "
 558                 "preserve and update.\n"));
 559
 560         ZERO_STRUCT(kt_entry);
 561         ZERO_STRUCT(cursor);
 562
 563         initialize_krb5_error_table();
 564         ret = krb5_init_context(&context);
 565         if (ret) {
 566                 DEBUG(1,("ads_keytab_create_default: could not krb5_init_context: %s\n",error_message(ret)));
 567                 return ret;
 568         }
 569
 570         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 571         if (ret) {
 572                 DEBUG(1,("ads_keytab_create_default: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 573                 goto done;
 574         }
 575
 576         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 577         if (ret != KRB5_KT_END && ret != ENOENT ) {
 578                 while ((ret = krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) == 0) {
 579                         smb_krb5_kt_free_entry(context, &kt_entry);
 580                         ZERO_STRUCT(kt_entry);
 581                         found++;
 582                 }
 583         }
 584         krb5_kt_end_seq_get(context, keytab, &cursor);
 585         ZERO_STRUCT(cursor);
 586
 587         /*
 588          * Hmmm. There is no "rewind" function for the keytab. This means we have a race condition
 589          * where someone else could add entries after we've counted them. Re-open asap to minimise
 590          * the race. JRA.
 591          */
 592
 593         DEBUG(3, ("ads_keytab_create_default: Found %d entries in the keytab.\n", found));
 594         if (!found) {
 595                 goto done;
 596         }
 597         oldEntries = SMB_MALLOC_ARRAY(char *, found );
 598         if (!oldEntries) {
 599                 DEBUG(1,("ads_keytab_create_default: Failed to allocate space to store the old keytab entries (malloc failed?).\n"));
 600                 ret = -1;
 601                 goto done;
 602         }
 603         memset(oldEntries, '\0', found * sizeof(char *));
 604
 605         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 606         if (ret != KRB5_KT_END && ret != ENOENT ) {
 607                 while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 608                         if (kt_entry.vno != kvno) {
 609                                 char *ktprinc = NULL;
 610                                 char *p;
 611
 612                                 /* This returns a malloc'ed string in ktprinc. */
 613                                 ret = smb_krb5_unparse_name(context, kt_entry.principal, &ktprinc);
 614                                 if (ret) {
 615                                         DEBUG(1,("smb_krb5_unparse_name failed (%s)\n", error_message(ret)));
 616                                         goto done;
 617                                 }
 618                                 /*
 619                                  * From looking at the krb5 source they don't seem to take locale
 620                                  * or mb strings into account. Maybe this is because they assume utf8 ?
 621                                  * In this case we may need to convert from utf8 to mb charset here ? JRA.
 622                                  */
 623                                 p = strchr_m(ktprinc, '@');
 624                                 if (p) {
 625                                         *p = '\0';
 626                                 }
 627
 628                                 p = strchr_m(ktprinc, '/');
 629                                 if (p) {
 630                                         *p = '\0';
 631                                 }
 632                                 for (i = 0; i < found; i++) {
 633                                         if (!oldEntries[i]) {
 634                                                 oldEntries[i] = ktprinc;
 635                                                 break;
 636                                         }
 637                                         if (!strcmp(oldEntries[i], ktprinc)) {
 638                                                 SAFE_FREE(ktprinc);
 639                                                 break;
 640                                         }
 641                                 }
 642                                 if (i == found) {
 643                                         SAFE_FREE(ktprinc);
 644                                 }
 645                         }
 646                         smb_krb5_kt_free_entry(context, &kt_entry);
 647                         ZERO_STRUCT(kt_entry);
 648                 }
 649                 ret = 0;
 650                 for (i = 0; oldEntries[i]; i++) {
 651                         ret |= ads_keytab_add_entry(ads, oldEntries[i]);
 652                         SAFE_FREE(oldEntries[i]);
 653                 }
 654                 krb5_kt_end_seq_get(context, keytab, &cursor);
 655         }
 656         ZERO_STRUCT(cursor);
 657
 658 done:
 659
 660         SAFE_FREE(oldEntries);
 661
 662         {
 663                 krb5_keytab_entry zero_kt_entry;
 664                 ZERO_STRUCT(zero_kt_entry);
 665                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 666                         smb_krb5_kt_free_entry(context, &kt_entry);
 667                 }
 668         }
 669         {
 670                 krb5_kt_cursor zero_csr;
 671                 ZERO_STRUCT(zero_csr);
 672                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 673                         krb5_kt_end_seq_get(context, keytab, &cursor);
 674                 }
 675         }
 676         if (keytab) {
 677                 krb5_kt_close(context, keytab);
 678         }
 679         if (context) {
 680                 krb5_free_context(context);
 681         }
 682         return ret;
 683 }
 684
 685 /**********************************************************************
 686  List system keytab.
 687 ***********************************************************************/
 688
 689 int ads_keytab_list(const char *keytab_name)
 690 {
 691         krb5_error_code ret = 0;
 692         krb5_context context = NULL;
 693         krb5_keytab keytab = NULL;
 694         krb5_kt_cursor cursor;
 695         krb5_keytab_entry kt_entry;
 696
 697         ZERO_STRUCT(kt_entry);
 698         ZERO_STRUCT(cursor);
 699
 700         initialize_krb5_error_table();
 701         ret = krb5_init_context(&context);
 702         if (ret) {
 703                 DEBUG(1,("ads_keytab_list: could not krb5_init_context: %s\n",error_message(ret)));
 704                 return ret;
 705         }
 706
 707         ret = smb_krb5_open_keytab(context, keytab_name, False, &keytab);
 708         if (ret) {
 709                 DEBUG(1,("ads_keytab_list: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 710                 goto out;
 711         }
 712
 713         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 714         if (ret) {
 715                 goto out;
 716         }
 717
 718         printf("Vno  Type        Principal\n");
 719
 720         while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 721
 722                 char *princ_s = NULL;
 723                 char *etype_s = NULL;
 724                 krb5_enctype enctype = 0;
 725
 726                 ret = smb_krb5_unparse_name(context, kt_entry.principal, &princ_s);
 727                 if (ret) {
 728                         goto out;
 729                 }
 730
 731                 enctype = smb_get_enctype_from_kt_entry(&kt_entry);
 732
 733                 ret = smb_krb5_enctype_to_string(context, enctype, &etype_s);
 734                 if (ret) {
 735                         SAFE_FREE(princ_s);
 736                         goto out;
 737                 }
 738
 739                 printf("%3d  %s\t\t %s\n", kt_entry.vno, etype_s, princ_s);
 740
 741                 SAFE_FREE(princ_s);
 742                 SAFE_FREE(etype_s);
 743
 744                 ret = smb_krb5_kt_free_entry(context, &kt_entry);
 745                 if (ret) {
 746                         goto out;
 747                 }
 748         }
 749
 750         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 751         if (ret) {
 752                 goto out;
 753         }
 754
 755         /* Ensure we don't double free. */
 756         ZERO_STRUCT(kt_entry);
 757         ZERO_STRUCT(cursor);
 758 out:
 759
 760         {
 761                 krb5_keytab_entry zero_kt_entry;
 762                 ZERO_STRUCT(zero_kt_entry);
 763                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 764                         smb_krb5_kt_free_entry(context, &kt_entry);
 765                 }
 766         }
 767         {
 768                 krb5_kt_cursor zero_csr;
 769                 ZERO_STRUCT(zero_csr);
 770                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 771                         krb5_kt_end_seq_get(context, keytab, &cursor);
 772                 }
 773         }
 774
 775         if (keytab) {
 776                 krb5_kt_close(context, keytab);
 777         }
 778         if (context) {
 779                 krb5_free_context(context);
 780         }
 781         return ret;
 782 }
 783
 784 #endif /* HAVE_KRB5 */