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