source3/libads/kerberos_keytab.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    kerberos keytab utility library
   4    Copyright (C) Andrew Tridgell 2001
   5    Copyright (C) Remus Koos 2001
   6    Copyright (C) Luke Howard 2003
   7    Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2003
   8    Copyright (C) Guenther Deschner 2003
   9    Copyright (C) Rakesh Patel 2004
  10    Copyright (C) Dan Perry 2004
  11    Copyright (C) Jeremy Allison 2004
  12    Copyright (C) Gerald Carter 2006
  13
  14    This program is free software; you can redistribute it and/or modify
  15    it under the terms of the GNU General Public License as published by
  16    the Free Software Foundation; either version 3 of the License, or
  17    (at your option) any later version.
  18
  19    This program is distributed in the hope that it will be useful,
  20    but WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22    GNU General Public License for more details.
  23
  24    You should have received a copy of the GNU General Public License
  25    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  26 */
  27
  28 #include "includes.h"
  29 #include "smb_krb5.h"
  30 #include "ads.h"
  31 #include "secrets.h"
  32
  33 #ifdef HAVE_KRB5
  34
  35 /**********************************************************************
  36 **********************************************************************/
  37
  38 int smb_krb5_kt_add_entry_ext(krb5_context context,
  39                               krb5_keytab keytab,
  40                               krb5_kvno kvno,
  41                               const char *princ_s,
  42                               krb5_enctype *enctypes,
  43                               krb5_data password,
  44                               bool no_salt,
  45                               bool keep_old_entries)
  46 {
  47         krb5_error_code ret = 0;
  48         krb5_kt_cursor cursor;
  49         krb5_keytab_entry kt_entry;
  50         krb5_principal princ = NULL;
  51         int i;
  52         char *ktprinc = NULL;
  53
  54         ZERO_STRUCT(kt_entry);
  55         ZERO_STRUCT(cursor);
  56
  57         ret = smb_krb5_parse_name(context, princ_s, &princ);
  58         if (ret) {
  59                 DEBUG(1,("smb_krb5_kt_add_entry_ext: smb_krb5_parse_name(%s) failed (%s)\n", princ_s, error_message(ret)));
  60                 goto out;
  61         }
  62
  63         /* Seek and delete old keytab entries */
  64         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
  65         if (ret != KRB5_KT_END && ret != ENOENT ) {
  66                 DEBUG(3,("smb_krb5_kt_add_entry_ext: Will try to delete old keytab entries\n"));
  67                 while(!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
  68                         bool compare_name_ok = False;
  69
  70                         ret = smb_krb5_unparse_name(talloc_tos(), context, kt_entry.principal, &ktprinc);
  71                         if (ret) {
  72                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: smb_krb5_unparse_name failed (%s)\n",
  73                                         error_message(ret)));
  74                                 goto out;
  75                         }
  76
  77                         /*---------------------------------------------------------------------------
  78                          * Save the entries with kvno - 1.   This is what microsoft does
  79                          * to allow people with existing sessions that have kvno - 1 to still
  80                          * work.   Otherwise, when the password for the machine changes, all
  81                          * kerberizied sessions will 'break' until either the client reboots or
  82                          * the client's session key expires and they get a new session ticket
  83                          * with the new kvno.
  84                          */
  85
  86 #ifdef HAVE_KRB5_KT_COMPARE
  87                         compare_name_ok = (krb5_kt_compare(context, &kt_entry, princ, 0, 0) == True);
  88 #else
  89                         compare_name_ok = (strcmp(ktprinc, princ_s) == 0);
  90 #endif
  91
  92                         if (!compare_name_ok) {
  93                                 DEBUG(10,("smb_krb5_kt_add_entry_ext: ignoring keytab entry principal %s, kvno = %d\n",
  94                                         ktprinc, kt_entry.vno));
  95                         }
  96
  97                         TALLOC_FREE(ktprinc);
  98
  99                         if (compare_name_ok) {
 100                                 if (kt_entry.vno == kvno - 1) {
 101                                         DEBUG(5,("smb_krb5_kt_add_entry_ext: Saving previous (kvno %d) entry for principal: %s.\n",
 102                                                 kvno - 1, princ_s));
 103                                 } else if (!keep_old_entries) {
 104                                         DEBUG(5,("smb_krb5_kt_add_entry_ext: Found old entry for principal: %s (kvno %d) - trying to remove it.\n",
 105                                                 princ_s, kt_entry.vno));
 106                                         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 107                                         ZERO_STRUCT(cursor);
 108                                         if (ret) {
 109                                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: krb5_kt_end_seq_get() failed (%s)\n",
 110                                                         error_message(ret)));
 111                                                 goto out;
 112                                         }
 113                                         ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
 114                                         if (ret) {
 115                                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: krb5_kt_remove_entry failed (%s)\n",
 116                                                         error_message(ret)));
 117                                                 goto out;
 118                                         }
 119
 120                                         DEBUG(5,("smb_krb5_kt_add_entry_ext: removed old entry for principal: %s (kvno %d).\n",
 121                                                 princ_s, kt_entry.vno));
 122
 123                                         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 124                                         if (ret) {
 125                                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: krb5_kt_start_seq failed (%s)\n",
 126                                                         error_message(ret)));
 127                                                 goto out;
 128                                         }
 129                                         ret = smb_krb5_kt_free_entry(context, &kt_entry);
 130                                         ZERO_STRUCT(kt_entry);
 131                                         if (ret) {
 132                                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: krb5_kt_remove_entry failed (%s)\n",
 133                                                         error_message(ret)));
 134                                                 goto out;
 135                                         }
 136                                         continue;
 137                                 }
 138                         }
 139
 140                         /* Not a match, just free this entry and continue. */
 141                         ret = smb_krb5_kt_free_entry(context, &kt_entry);
 142                         ZERO_STRUCT(kt_entry);
 143                         if (ret) {
 144                                 DEBUG(1,("smb_krb5_kt_add_entry_ext: smb_krb5_kt_free_entry failed (%s)\n", error_message(ret)));
 145                                 goto out;
 146                         }
 147                 }
 148
 149                 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 150                 ZERO_STRUCT(cursor);
 151                 if (ret) {
 152                         DEBUG(1,("smb_krb5_kt_add_entry_ext: krb5_kt_end_seq_get failed (%s)\n",error_message(ret)));
 153                         goto out;
 154                 }
 155         }
 156
 157         /* Ensure we don't double free. */
 158         ZERO_STRUCT(kt_entry);
 159         ZERO_STRUCT(cursor);
 160
 161         /* If we get here, we have deleted all the old entries with kvno's not equal to the current kvno-1. */
 162
 163         /* Now add keytab entries for all encryption types */
 164         for (i = 0; enctypes[i]; i++) {
 165                 krb5_keyblock *keyp;
 166
 167                 keyp = KRB5_KT_KEY(&kt_entry);
 168
 169                 if (create_kerberos_key_from_string(context, princ, &password, keyp, enctypes[i], no_salt)) {
 170                         continue;
 171                 }
 172
 173                 kt_entry.principal = princ;
 174                 kt_entry.vno       = kvno;
 175
 176                 DEBUG(3,("smb_krb5_kt_add_entry_ext: adding keytab entry for (%s) with encryption type (%d) and version (%d)\n",
 177                         princ_s, enctypes[i], kt_entry.vno));
 178                 ret = krb5_kt_add_entry(context, keytab, &kt_entry);
 179                 krb5_free_keyblock_contents(context, keyp);
 180                 ZERO_STRUCT(kt_entry);
 181                 if (ret) {
 182                         DEBUG(1,("smb_krb5_kt_add_entry_ext: adding entry to keytab failed (%s)\n", error_message(ret)));
 183                         goto out;
 184                 }
 185         }
 186
 187
 188 out:
 189         {
 190                 krb5_keytab_entry zero_kt_entry;
 191                 ZERO_STRUCT(zero_kt_entry);
 192                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 193                         smb_krb5_kt_free_entry(context, &kt_entry);
 194                 }
 195         }
 196         if (princ) {
 197                 krb5_free_principal(context, princ);
 198         }
 199
 200         {
 201                 krb5_kt_cursor zero_csr;
 202                 ZERO_STRUCT(zero_csr);
 203                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 204                         krb5_kt_end_seq_get(context, keytab, &cursor);
 205                 }
 206         }
 207
 208         return (int)ret;
 209 }
 210
 211 static int smb_krb5_kt_add_entry(krb5_context context,
 212                                  krb5_keytab keytab,
 213                                  krb5_kvno kvno,
 214                                  const char *princ_s,
 215                                  krb5_enctype *enctypes,
 216                                  krb5_data password)
 217 {
 218         return smb_krb5_kt_add_entry_ext(context,
 219                                          keytab,
 220                                          kvno,
 221                                          princ_s,
 222                                          enctypes,
 223                                          password,
 224                                          false,
 225                                          false);
 226 }
 227
 228 /**********************************************************************
 229  Adds a single service principal, i.e. 'host' to the system keytab
 230 ***********************************************************************/
 231
 232 int ads_keytab_add_entry(ADS_STRUCT *ads, const char *srvPrinc)
 233 {
 234         krb5_error_code ret = 0;
 235         krb5_context context = NULL;
 236         krb5_keytab keytab = NULL;
 237         krb5_data password;
 238         krb5_kvno kvno;
 239         krb5_enctype enctypes[4] = { ENCTYPE_DES_CBC_CRC, ENCTYPE_DES_CBC_MD5, 0, 0 };
 240         char *princ_s = NULL, *short_princ_s = NULL;
 241         char *password_s = NULL;
 242         char *my_fqdn;
 243         TALLOC_CTX *ctx = NULL;
 244         char *machine_name;
 245
 246 #if defined(ENCTYPE_ARCFOUR_HMAC)
 247         enctypes[2] = ENCTYPE_ARCFOUR_HMAC;
 248 #endif
 249
 250         initialize_krb5_error_table();
 251         ret = krb5_init_context(&context);
 252         if (ret) {
 253                 DEBUG(1,("ads_keytab_add_entry: could not krb5_init_context: %s\n",error_message(ret)));
 254                 return -1;
 255         }
 256
 257         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 258         if (ret) {
 259                 DEBUG(1,("ads_keytab_add_entry: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 260                 goto out;
 261         }
 262
 263         /* retrieve the password */
 264         if (!secrets_init()) {
 265                 DEBUG(1,("ads_keytab_add_entry: secrets_init failed\n"));
 266                 ret = -1;
 267                 goto out;
 268         }
 269         password_s = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
 270         if (!password_s) {
 271                 DEBUG(1,("ads_keytab_add_entry: failed to fetch machine password\n"));
 272                 ret = -1;
 273                 goto out;
 274         }
 275         ZERO_STRUCT(password);
 276         password.data = password_s;
 277         password.length = strlen(password_s);
 278
 279         /* we need the dNSHostName value here */
 280
 281         if ( (ctx = talloc_init("ads_keytab_add_entry")) == NULL ) {
 282                 DEBUG(0,("ads_keytab_add_entry: talloc() failed!\n"));
 283                 ret = -1;
 284                 goto out;
 285         }
 286
 287         if ( (my_fqdn = ads_get_dnshostname( ads, ctx, global_myname())) == NULL ) {
 288                 DEBUG(0,("ads_keytab_add_entry: unable to determine machine account's dns name in AD!\n"));
 289                 ret = -1;
 290                 goto out;
 291         }
 292
 293         if ( (machine_name = ads_get_samaccountname( ads, ctx, global_myname())) == NULL ) {
 294                 DEBUG(0,("ads_keytab_add_entry: unable to determine machine account's short name in AD!\n"));
 295                 ret = -1;
 296                 goto out;
 297         }
 298         /*strip the trailing '$' */
 299         machine_name[strlen(machine_name)-1] = '\0';
 300
 301         /* Construct our principal */
 302
 303         if (strchr_m(srvPrinc, '@')) {
 304                 /* It's a fully-named principal. */
 305                 if (asprintf(&princ_s, "%s", srvPrinc) == -1) {
 306                         ret = -1;
 307                         goto out;
 308                 }
 309         } else if (srvPrinc[strlen(srvPrinc)-1] == '$') {
 310                 /* It's the machine account, as used by smbclient clients. */
 311                 if (asprintf(&princ_s, "%s@%s", srvPrinc, lp_realm()) == -1) {
 312                         ret = -1;
 313                         goto out;
 314                 }
 315         } else {
 316                 /* It's a normal service principal.  Add the SPN now so that we
 317                  * can obtain credentials for it and double-check the salt value
 318                  * used to generate the service's keys. */
 319
 320                 if (asprintf(&princ_s, "%s/%s@%s", srvPrinc, my_fqdn, lp_realm()) == -1) {
 321                         ret = -1;
 322                         goto out;
 323                 }
 324                 if (asprintf(&short_princ_s, "%s/%s@%s", srvPrinc, machine_name, lp_realm()) == -1) {
 325                         ret = -1;
 326                         goto out;
 327                 }
 328
 329                 /* According to http://support.microsoft.com/kb/326985/en-us,
 330                    certain principal names are automatically mapped to the host/...
 331                    principal in the AD account.  So only create these in the
 332                    keytab, not in AD.  --jerry */
 333
 334                 if ( !strequal( srvPrinc, "cifs" ) && !strequal(srvPrinc, "host" ) ) {
 335                         DEBUG(3,("ads_keytab_add_entry: Attempting to add/update '%s'\n", princ_s));
 336
 337                         if (!ADS_ERR_OK(ads_add_service_principal_name(ads, global_myname(), my_fqdn, srvPrinc))) {
 338                                 DEBUG(1,("ads_keytab_add_entry: ads_add_service_principal_name failed.\n"));
 339                                 goto out;
 340                         }
 341                 }
 342         }
 343
 344         kvno = (krb5_kvno) ads_get_machine_kvno(ads, global_myname());
 345         if (kvno == -1) {       /* -1 indicates failure, everything else is OK */
 346                 DEBUG(1,("ads_keytab_add_entry: ads_get_machine_kvno failed to determine the system's kvno.\n"));
 347                 ret = -1;
 348                 goto out;
 349         }
 350
 351         /* add the fqdn principal to the keytab */
 352
 353         ret = smb_krb5_kt_add_entry( context, keytab, kvno, princ_s, enctypes, password );
 354         if ( ret ) {
 355                 DEBUG(1,("ads_keytab_add_entry: Failed to add entry to keytab file\n"));
 356                 goto out;
 357         }
 358
 359         /* add the short principal name if we have one */
 360
 361         if ( short_princ_s ) {
 362                 ret = smb_krb5_kt_add_entry( context, keytab, kvno, short_princ_s, enctypes, password );
 363                 if ( ret ) {
 364                         DEBUG(1,("ads_keytab_add_entry: Failed to add short entry to keytab file\n"));
 365                         goto out;
 366                 }
 367         }
 368
 369 out:
 370         SAFE_FREE( princ_s );
 371         SAFE_FREE( short_princ_s );
 372         TALLOC_FREE( ctx );
 373
 374         if (keytab) {
 375                 krb5_kt_close(context, keytab);
 376         }
 377         if (context) {
 378                 krb5_free_context(context);
 379         }
 380         return (int)ret;
 381 }
 382
 383 /**********************************************************************
 384  Flushes all entries from the system keytab.
 385 ***********************************************************************/
 386
 387 int ads_keytab_flush(ADS_STRUCT *ads)
 388 {
 389         krb5_error_code ret = 0;
 390         krb5_context context = NULL;
 391         krb5_keytab keytab = NULL;
 392         krb5_kt_cursor cursor;
 393         krb5_keytab_entry kt_entry;
 394         krb5_kvno kvno;
 395
 396         ZERO_STRUCT(kt_entry);
 397         ZERO_STRUCT(cursor);
 398
 399         initialize_krb5_error_table();
 400         ret = krb5_init_context(&context);
 401         if (ret) {
 402                 DEBUG(1,("ads_keytab_flush: could not krb5_init_context: %s\n",error_message(ret)));
 403                 return ret;
 404         }
 405
 406         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 407         if (ret) {
 408                 DEBUG(1,("ads_keytab_flush: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 409                 goto out;
 410         }
 411
 412         kvno = (krb5_kvno) ads_get_machine_kvno(ads, global_myname());
 413         if (kvno == -1) {       /* -1 indicates a failure */
 414                 DEBUG(1,("ads_keytab_flush: Error determining the system's kvno.\n"));
 415                 goto out;
 416         }
 417
 418         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 419         if (ret != KRB5_KT_END && ret != ENOENT) {
 420                 while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
 421                         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 422                         ZERO_STRUCT(cursor);
 423                         if (ret) {
 424                                 DEBUG(1,("ads_keytab_flush: krb5_kt_end_seq_get() failed (%s)\n",error_message(ret)));
 425                                 goto out;
 426                         }
 427                         ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
 428                         if (ret) {
 429                                 DEBUG(1,("ads_keytab_flush: krb5_kt_remove_entry failed (%s)\n",error_message(ret)));
 430                                 goto out;
 431                         }
 432                         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 433                         if (ret) {
 434                                 DEBUG(1,("ads_keytab_flush: krb5_kt_start_seq failed (%s)\n",error_message(ret)));
 435                                 goto out;
 436                         }
 437                         ret = smb_krb5_kt_free_entry(context, &kt_entry);
 438                         ZERO_STRUCT(kt_entry);
 439                         if (ret) {
 440                                 DEBUG(1,("ads_keytab_flush: krb5_kt_remove_entry failed (%s)\n",error_message(ret)));
 441                                 goto out;
 442                         }
 443                 }
 444         }
 445
 446         /* Ensure we don't double free. */
 447         ZERO_STRUCT(kt_entry);
 448         ZERO_STRUCT(cursor);
 449
 450         if (!ADS_ERR_OK(ads_clear_service_principal_names(ads, global_myname()))) {
 451                 DEBUG(1,("ads_keytab_flush: Error while clearing service principal listings in LDAP.\n"));
 452                 goto out;
 453         }
 454
 455 out:
 456
 457         {
 458                 krb5_keytab_entry zero_kt_entry;
 459                 ZERO_STRUCT(zero_kt_entry);
 460                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 461                         smb_krb5_kt_free_entry(context, &kt_entry);
 462                 }
 463         }
 464         {
 465                 krb5_kt_cursor zero_csr;
 466                 ZERO_STRUCT(zero_csr);
 467                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 468                         krb5_kt_end_seq_get(context, keytab, &cursor);
 469                 }
 470         }
 471         if (keytab) {
 472                 krb5_kt_close(context, keytab);
 473         }
 474         if (context) {
 475                 krb5_free_context(context);
 476         }
 477         return ret;
 478 }
 479
 480 /**********************************************************************
 481  Adds all the required service principals to the system keytab.
 482 ***********************************************************************/
 483
 484 int ads_keytab_create_default(ADS_STRUCT *ads)
 485 {
 486         krb5_error_code ret = 0;
 487         krb5_context context = NULL;
 488         krb5_keytab keytab = NULL;
 489         krb5_kt_cursor cursor;
 490         krb5_keytab_entry kt_entry;
 491         krb5_kvno kvno;
 492         int i, found = 0;
 493         char *sam_account_name, *upn;
 494         char **oldEntries = NULL, *princ_s[26];
 495         TALLOC_CTX *ctx = NULL;
 496         fstring machine_name;
 497
 498         memset(princ_s, '\0', sizeof(princ_s));
 499
 500         fstrcpy( machine_name, global_myname() );
 501
 502         /* these are the main ones we need */
 503
 504         if ( (ret = ads_keytab_add_entry(ads, "host") ) != 0 ) {
 505                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding 'host'.\n"));
 506                 return ret;
 507         }
 508
 509
 510 #if 0   /* don't create the CIFS/... keytab entries since no one except smbd
 511            really needs them and we will fall back to verifying against secrets.tdb */
 512
 513         if ( (ret = ads_keytab_add_entry(ads, "cifs")) != 0 ) {
 514                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding 'cifs'.\n"));
 515                 return ret;
 516         }
 517 #endif
 518
 519         if ( (ctx = talloc_init("ads_keytab_create_default")) == NULL ) {
 520                 DEBUG(0,("ads_keytab_create_default: talloc() failed!\n"));
 521                 return -1;
 522         }
 523
 524         /* now add the userPrincipalName and sAMAccountName entries */
 525
 526         if ( (sam_account_name = ads_get_samaccountname( ads, ctx, machine_name)) == NULL ) {
 527                 DEBUG(0,("ads_keytab_add_entry: unable to determine machine account's name in AD!\n"));
 528                 TALLOC_FREE( ctx );
 529                 return -1;
 530         }
 531
 532         /* upper case the sAMAccountName to make it easier for apps to
 533            know what case to use in the keytab file */
 534
 535         strupper_m( sam_account_name );
 536
 537         if ( (ret = ads_keytab_add_entry(ads, sam_account_name )) != 0 ) {
 538                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding sAMAccountName (%s)\n",
 539                         sam_account_name));
 540                 return ret;
 541         }
 542
 543         /* remember that not every machine account will have a upn */
 544
 545         upn = ads_get_upn( ads, ctx, machine_name);
 546         if ( upn ) {
 547                 if ( (ret = ads_keytab_add_entry(ads, upn)) != 0 ) {
 548                         DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding UPN (%s)\n",
 549                                 upn));
 550                         TALLOC_FREE( ctx );
 551                         return ret;
 552                 }
 553         }
 554
 555         /* Now loop through the keytab and update any other existing entries... */
 556
 557         kvno = (krb5_kvno) ads_get_machine_kvno(ads, machine_name);
 558         if (kvno == -1) {
 559                 DEBUG(1,("ads_keytab_create_default: ads_get_machine_kvno failed to determine the system's kvno.\n"));
 560                 TALLOC_FREE(ctx);
 561                 return -1;
 562         }
 563
 564         DEBUG(3,("ads_keytab_create_default: Searching for keytab entries to "
 565                 "preserve and update.\n"));
 566
 567         ZERO_STRUCT(kt_entry);
 568         ZERO_STRUCT(cursor);
 569
 570         initialize_krb5_error_table();
 571         ret = krb5_init_context(&context);
 572         if (ret) {
 573                 DEBUG(1,("ads_keytab_create_default: could not krb5_init_context: %s\n",error_message(ret)));
 574                 TALLOC_FREE(ctx);
 575                 return ret;
 576         }
 577
 578         ret = smb_krb5_open_keytab(context, NULL, True, &keytab);
 579         if (ret) {
 580                 DEBUG(1,("ads_keytab_create_default: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 581                 goto done;
 582         }
 583
 584         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 585         if (ret != KRB5_KT_END && ret != ENOENT ) {
 586                 while ((ret = krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) == 0) {
 587                         smb_krb5_kt_free_entry(context, &kt_entry);
 588                         ZERO_STRUCT(kt_entry);
 589                         found++;
 590                 }
 591         }
 592         krb5_kt_end_seq_get(context, keytab, &cursor);
 593         ZERO_STRUCT(cursor);
 594
 595         /*
 596          * Hmmm. There is no "rewind" function for the keytab. This means we have a race condition
 597          * where someone else could add entries after we've counted them. Re-open asap to minimise
 598          * the race. JRA.
 599          */
 600
 601         DEBUG(3, ("ads_keytab_create_default: Found %d entries in the keytab.\n", found));
 602         if (!found) {
 603                 goto done;
 604         }
 605         oldEntries = talloc_array(ctx, char *, found );
 606         if (!oldEntries) {
 607                 DEBUG(1,("ads_keytab_create_default: Failed to allocate space to store the old keytab entries (malloc failed?).\n"));
 608                 ret = -1;
 609                 goto done;
 610         }
 611         memset(oldEntries, '\0', found * sizeof(char *));
 612
 613         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 614         if (ret != KRB5_KT_END && ret != ENOENT ) {
 615                 while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 616                         if (kt_entry.vno != kvno) {
 617                                 char *ktprinc = NULL;
 618                                 char *p;
 619
 620                                 /* This returns a malloc'ed string in ktprinc. */
 621                                 ret = smb_krb5_unparse_name(oldEntries, context, kt_entry.principal, &ktprinc);
 622                                 if (ret) {
 623                                         DEBUG(1,("smb_krb5_unparse_name failed (%s)\n", error_message(ret)));
 624                                         goto done;
 625                                 }
 626                                 /*
 627                                  * From looking at the krb5 source they don't seem to take locale
 628                                  * or mb strings into account. Maybe this is because they assume utf8 ?
 629                                  * In this case we may need to convert from utf8 to mb charset here ? JRA.
 630                                  */
 631                                 p = strchr_m(ktprinc, '@');
 632                                 if (p) {
 633                                         *p = '\0';
 634                                 }
 635
 636                                 p = strchr_m(ktprinc, '/');
 637                                 if (p) {
 638                                         *p = '\0';
 639                                 }
 640                                 for (i = 0; i < found; i++) {
 641                                         if (!oldEntries[i]) {
 642                                                 oldEntries[i] = ktprinc;
 643                                                 break;
 644                                         }
 645                                         if (!strcmp(oldEntries[i], ktprinc)) {
 646                                                 TALLOC_FREE(ktprinc);
 647                                                 break;
 648                                         }
 649                                 }
 650                                 if (i == found) {
 651                                         TALLOC_FREE(ktprinc);
 652                                 }
 653                         }
 654                         smb_krb5_kt_free_entry(context, &kt_entry);
 655                         ZERO_STRUCT(kt_entry);
 656                 }
 657                 ret = 0;
 658                 for (i = 0; oldEntries[i]; i++) {
 659                         ret |= ads_keytab_add_entry(ads, oldEntries[i]);
 660                         TALLOC_FREE(oldEntries[i]);
 661                 }
 662                 krb5_kt_end_seq_get(context, keytab, &cursor);
 663         }
 664         ZERO_STRUCT(cursor);
 665
 666 done:
 667
 668         TALLOC_FREE(oldEntries);
 669         TALLOC_FREE(ctx);
 670
 671         {
 672                 krb5_keytab_entry zero_kt_entry;
 673                 ZERO_STRUCT(zero_kt_entry);
 674                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 675                         smb_krb5_kt_free_entry(context, &kt_entry);
 676                 }
 677         }
 678         {
 679                 krb5_kt_cursor zero_csr;
 680                 ZERO_STRUCT(zero_csr);
 681                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 682                         krb5_kt_end_seq_get(context, keytab, &cursor);
 683                 }
 684         }
 685         if (keytab) {
 686                 krb5_kt_close(context, keytab);
 687         }
 688         if (context) {
 689                 krb5_free_context(context);
 690         }
 691         return ret;
 692 }
 693
 694 /**********************************************************************
 695  List system keytab.
 696 ***********************************************************************/
 697
 698 int ads_keytab_list(const char *keytab_name)
 699 {
 700         krb5_error_code ret = 0;
 701         krb5_context context = NULL;
 702         krb5_keytab keytab = NULL;
 703         krb5_kt_cursor cursor;
 704         krb5_keytab_entry kt_entry;
 705
 706         ZERO_STRUCT(kt_entry);
 707         ZERO_STRUCT(cursor);
 708
 709         initialize_krb5_error_table();
 710         ret = krb5_init_context(&context);
 711         if (ret) {
 712                 DEBUG(1,("ads_keytab_list: could not krb5_init_context: %s\n",error_message(ret)));
 713                 return ret;
 714         }
 715
 716         ret = smb_krb5_open_keytab(context, keytab_name, False, &keytab);
 717         if (ret) {
 718                 DEBUG(1,("ads_keytab_list: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
 719                 goto out;
 720         }
 721
 722         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 723         if (ret) {
 724                 goto out;
 725         }
 726
 727         printf("Vno  Type        Principal\n");
 728
 729         while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 730
 731                 char *princ_s = NULL;
 732                 char *etype_s = NULL;
 733                 krb5_enctype enctype = 0;
 734
 735                 ret = smb_krb5_unparse_name(talloc_tos(), context, kt_entry.principal, &princ_s);
 736                 if (ret) {
 737                         goto out;
 738                 }
 739
 740                 enctype = smb_get_enctype_from_kt_entry(&kt_entry);
 741
 742                 ret = smb_krb5_enctype_to_string(context, enctype, &etype_s);
 743                 if (ret) {
 744                         if (asprintf(&etype_s, "UNKNOWN: %d\n", enctype) == -1)
 745                         {
 746                                 TALLOC_FREE(princ_s);
 747                                 goto out;
 748                         }
 749                 }
 750
 751                 printf("%3d  %s\t\t %s\n", kt_entry.vno, etype_s, princ_s);
 752
 753                 TALLOC_FREE(princ_s);
 754                 SAFE_FREE(etype_s);
 755
 756                 ret = smb_krb5_kt_free_entry(context, &kt_entry);
 757                 if (ret) {
 758                         goto out;
 759                 }
 760         }
 761
 762         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 763         if (ret) {
 764                 goto out;
 765         }
 766
 767         /* Ensure we don't double free. */
 768         ZERO_STRUCT(kt_entry);
 769         ZERO_STRUCT(cursor);
 770 out:
 771
 772         {
 773                 krb5_keytab_entry zero_kt_entry;
 774                 ZERO_STRUCT(zero_kt_entry);
 775                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 776                         smb_krb5_kt_free_entry(context, &kt_entry);
 777                 }
 778         }
 779         {
 780                 krb5_kt_cursor zero_csr;
 781                 ZERO_STRUCT(zero_csr);
 782                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 783                         krb5_kt_end_seq_get(context, keytab, &cursor);
 784                 }
 785         }
 786
 787         if (keytab) {
 788                 krb5_kt_close(context, keytab);
 789         }
 790         if (context) {
 791                 krb5_free_context(context);
 792         }
 793         return ret;
 794 }
 795
 796 #endif /* HAVE_KRB5 */