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 #ifdef HAVE_ADS
  36
  37 /* This MAX_NAME_LEN is a constant defined in krb5.h */
  38 #ifndef MAX_KEYTAB_NAME_LEN
  39 #define MAX_KEYTAB_NAME_LEN 1100
  40 #endif
  41
  42 static krb5_error_code ads_keytab_open(krb5_context context,
  43                                        krb5_keytab *keytab)
  44 {
  45         char keytab_str[MAX_KEYTAB_NAME_LEN] = {0};
  46         const char *keytab_name = NULL;
  47         krb5_error_code ret = 0;
  48
  49         switch (lp_kerberos_method()) {
  50         case KERBEROS_VERIFY_SYSTEM_KEYTAB:
  51         case KERBEROS_VERIFY_SECRETS_AND_KEYTAB:
  52                 ret = krb5_kt_default_name(context,
  53                                            keytab_str,
  54                                            sizeof(keytab_str) - 2);
  55                 if (ret != 0) {
  56                         DBG_WARNING("Failed to get default keytab name");
  57                         goto out;
  58                 }
  59                 keytab_name = keytab_str;
  60                 break;
  61         case KERBEROS_VERIFY_DEDICATED_KEYTAB:
  62                 keytab_name = lp_dedicated_keytab_file();
  63                 break;
  64         default:
  65                 DBG_ERR("Invalid kerberos method set (%d)\n",
  66                         lp_kerberos_method());
  67                 ret = KRB5_KT_BADNAME;
  68                 goto out;
  69         }
  70
  71         if (keytab_name == NULL || keytab_name[0] == '\0') {
  72                 DBG_ERR("Invalid keytab name\n");
  73                 ret = KRB5_KT_BADNAME;
  74                 goto out;
  75         }
  76
  77         ret = smb_krb5_kt_open(context, keytab_name, true, keytab);
  78         if (ret != 0) {
  79                 DBG_WARNING("smb_krb5_kt_open failed (%s)\n",
  80                             error_message(ret));
  81                 goto out;
  82         }
  83
  84 out:
  85         return ret;
  86 }
  87
  88 static bool fill_default_spns(TALLOC_CTX *ctx, const char *machine_name,
  89                                           const char *my_fqdn, const char *spn,
  90                                           const char ***spns)
  91 {
  92         char *psp1, *psp2;
  93
  94         if (*spns == NULL) {
  95                 *spns = talloc_zero_array(ctx, const char*, 3);
  96                 if (*spns == NULL) {
  97                         return false;
  98                 }
  99         }
 100
 101         psp1 = talloc_asprintf(ctx,
 102                                "%s/%s",
 103                                spn,
 104                                machine_name);
 105         if (psp1 == NULL) {
 106                 return false;
 107         }
 108
 109         if (!strlower_m(&psp1[strlen(spn) + 1])) {
 110                 return false;
 111         }
 112         (*spns)[0] = psp1;
 113
 114         psp2 = talloc_asprintf(ctx,
 115                                "%s/%s",
 116                                spn,
 117                                my_fqdn);
 118         if (psp2 == NULL) {
 119                 return false;
 120         }
 121
 122         if (!strlower_m(&psp2[strlen(spn) + 1])) {
 123                 return false;
 124         }
 125
 126         (*spns)[1] = psp2;
 127
 128         return true;
 129 }
 130
 131 static bool ads_set_machine_account_spns(TALLOC_CTX *ctx,
 132                                          ADS_STRUCT *ads,
 133                                          const char *service_or_spn,
 134                                          const char *my_fqdn)
 135 {
 136         const char **spn_names = NULL;
 137         ADS_STATUS aderr;
 138         struct spn_struct* spn_struct = NULL;
 139         char *tmp = NULL;
 140
 141         /* SPN should have '/' */
 142         tmp = strchr_m(service_or_spn, '/');
 143         if (tmp != NULL) {
 144                 spn_struct = parse_spn(ctx, service_or_spn);
 145                 if (spn_struct == NULL) {
 146                         return false;
 147                 }
 148         }
 149
 150         DBG_INFO("Attempting to add/update '%s'\n", service_or_spn);
 151
 152         if (spn_struct != NULL) {
 153                 spn_names = talloc_zero_array(ctx, const char*, 2);
 154                 spn_names[0] = service_or_spn;
 155         } else {
 156                 bool ok;
 157
 158                 ok = fill_default_spns(ctx,
 159                                        lp_netbios_name(),
 160                                        my_fqdn,
 161                                        service_or_spn,
 162                                        &spn_names);
 163                 if (!ok) {
 164                         return false;
 165                 }
 166         }
 167         aderr = ads_add_service_principal_names(ads,
 168                                                 lp_netbios_name(),
 169                                                 spn_names);
 170         if (!ADS_ERR_OK(aderr)) {
 171                 DBG_WARNING("Failed to add service principal name.\n");
 172                 return false;
 173         }
 174
 175         return true;
 176 }
 177
 178 /*
 179  * Create kerberos principal(s) from SPN or service name.
 180  */
 181 static bool service_or_spn_to_kerberos_princ(TALLOC_CTX *ctx,
 182                                              const char *service_or_spn,
 183                                              const char *my_fqdn,
 184                                              char **p_princ_s,
 185                                              char **p_short_princ_s)
 186 {
 187         char *princ_s = NULL;
 188         char *short_princ_s = NULL;
 189         const char *service = service_or_spn;
 190         const char *host = my_fqdn;
 191         struct spn_struct* spn_struct = NULL;
 192         char *tmp = NULL;
 193         bool ok = true;
 194
 195         /* SPN should have '/' */
 196         tmp = strchr_m(service_or_spn, '/');
 197         if (tmp != NULL) {
 198                 spn_struct = parse_spn(ctx, service_or_spn);
 199                 if (spn_struct == NULL) {
 200                         ok = false;
 201                         goto out;
 202                 }
 203         }
 204         if (spn_struct != NULL) {
 205                 service = spn_struct->serviceclass;
 206                 host = spn_struct->host;
 207         }
 208         princ_s = talloc_asprintf(ctx, "%s/%s@%s",
 209                                   service,
 210                                   host, lp_realm());
 211         if (princ_s == NULL) {
 212                 ok = false;
 213                 goto out;
 214         }
 215
 216         if (spn_struct == NULL) {
 217                 short_princ_s = talloc_asprintf(ctx, "%s/%s@%s",
 218                                         service, lp_netbios_name(),
 219                                         lp_realm());
 220                 if (short_princ_s == NULL) {
 221                         ok = false;
 222                         goto out;
 223                 }
 224         }
 225         *p_princ_s = princ_s;
 226         *p_short_princ_s = short_princ_s;
 227 out:
 228         return ok;
 229 }
 230
 231 static int add_kt_entry_etypes(krb5_context context, TALLOC_CTX *tmpctx,
 232                                ADS_STRUCT *ads, const char *salt_princ_s,
 233                                krb5_keytab keytab, krb5_kvno kvno,
 234                                const char *srvPrinc, const char *my_fqdn,
 235                                krb5_data *password, bool update_ads)
 236 {
 237         krb5_error_code ret = 0;
 238         char *princ_s = NULL;
 239         char *short_princ_s = NULL;
 240         krb5_enctype enctypes[4] = {
 241 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
 242                 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
 243 #endif
 244 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
 245                 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
 246 #endif
 247                 ENCTYPE_ARCFOUR_HMAC,
 248                 0
 249         };
 250         size_t i;
 251
 252         /* Construct our principal */
 253         if (strchr_m(srvPrinc, '@')) {
 254                 /* It's a fully-named principal. */
 255                 princ_s = talloc_asprintf(tmpctx, "%s", srvPrinc);
 256                 if (!princ_s) {
 257                         ret = -1;
 258                         goto out;
 259                 }
 260         } else if (srvPrinc[strlen(srvPrinc)-1] == '$') {
 261                 /* It's the machine account, as used by smbclient clients. */
 262                 princ_s = talloc_asprintf(tmpctx, "%s@%s",
 263                                           srvPrinc, lp_realm());
 264                 if (!princ_s) {
 265                         ret = -1;
 266                         goto out;
 267                 }
 268         } else {
 269                 /* It's a normal service principal.  Add the SPN now so that we
 270                  * can obtain credentials for it and double-check the salt value
 271                  * used to generate the service's keys. */
 272
 273                 if (!service_or_spn_to_kerberos_princ(tmpctx,
 274                                                       srvPrinc,
 275                                                       my_fqdn,
 276                                                       &princ_s,
 277                                                       &short_princ_s)) {
 278                         ret = -1;
 279                         goto out;
 280                 }
 281
 282                 /* According to http://support.microsoft.com/kb/326985/en-us,
 283                    certain principal names are automatically mapped to the
 284                    host/... principal in the AD account.
 285                    So only create these in the keytab, not in AD.  --jerry */
 286
 287                 if (update_ads && !strequal(srvPrinc, "cifs") &&
 288                     !strequal(srvPrinc, "host")) {
 289                         if (!ads_set_machine_account_spns(tmpctx,
 290                                                           ads,
 291                                                           srvPrinc,
 292                                                           my_fqdn)) {
 293                                 ret = -1;
 294                                 goto out;
 295                         }
 296                 }
 297         }
 298
 299         for (i = 0; enctypes[i]; i++) {
 300
 301                 /* add the fqdn principal to the keytab */
 302                 ret = smb_krb5_kt_add_entry(context,
 303                                             keytab,
 304                                             kvno,
 305                                             princ_s,
 306                                             salt_princ_s,
 307                                             enctypes[i],
 308                                             password,
 309                                             false,
 310                                             false);
 311                 if (ret) {
 312                         DBG_WARNING("Failed to add entry to keytab\n");
 313                         goto out;
 314                 }
 315
 316                 /* add the short principal name if we have one */
 317                 if (short_princ_s) {
 318                         ret = smb_krb5_kt_add_entry(context,
 319                                                     keytab,
 320                                                     kvno,
 321                                                     short_princ_s,
 322                                                     salt_princ_s,
 323                                                     enctypes[i],
 324                                                     password,
 325                                                     false,
 326                                                     false);
 327                         if (ret) {
 328                                 DBG_WARNING("Failed to add short entry to keytab\n");
 329                                 goto out;
 330                         }
 331                 }
 332         }
 333 out:
 334         return ret;
 335 }
 336
 337 /**********************************************************************
 338  Adds a single service principal, i.e. 'host' to the system keytab
 339 ***********************************************************************/
 340
 341 int ads_keytab_add_entry(ADS_STRUCT *ads, const char *srvPrinc, bool update_ads)
 342 {
 343         krb5_error_code ret = 0;
 344         krb5_context context = NULL;
 345         krb5_keytab keytab = NULL;
 346         krb5_data password;
 347         krb5_kvno kvno;
 348         char *salt_princ_s = NULL;
 349         char *password_s = NULL;
 350         char *my_fqdn;
 351         TALLOC_CTX *tmpctx = NULL;
 352         char **hostnames_array = NULL;
 353         size_t num_hostnames = 0;
 354
 355         ret = smb_krb5_init_context_common(&context);
 356         if (ret) {
 357                 DBG_ERR("kerberos init context failed (%s)\n",
 358                         error_message(ret));
 359                 return -1;
 360         }
 361
 362         ret = ads_keytab_open(context, &keytab);
 363         if (ret != 0) {
 364                 goto out;
 365         }
 366
 367         /* retrieve the password */
 368         if (!secrets_init()) {
 369                 DBG_WARNING("secrets_init failed\n");
 370                 ret = -1;
 371                 goto out;
 372         }
 373         password_s = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
 374         if (!password_s) {
 375                 DBG_WARNING("failed to fetch machine password\n");
 376                 ret = -1;
 377                 goto out;
 378         }
 379         ZERO_STRUCT(password);
 380         password.data = password_s;
 381         password.length = strlen(password_s);
 382
 383         /* we need the dNSHostName value here */
 384         tmpctx = talloc_init(__location__);
 385         if (!tmpctx) {
 386                 DBG_ERR("talloc_init() failed!\n");
 387                 ret = -1;
 388                 goto out;
 389         }
 390
 391         my_fqdn = ads_get_dnshostname(ads, tmpctx, lp_netbios_name());
 392         if (!my_fqdn) {
 393                 DBG_ERR("unable to determine machine account's dns name in "
 394                         "AD!\n");
 395                 ret = -1;
 396                 goto out;
 397         }
 398
 399         /* make sure we have a single instance of a the computer account */
 400         if (!ads_has_samaccountname(ads, tmpctx, lp_netbios_name())) {
 401                 DBG_ERR("unable to determine machine account's short name in "
 402                         "AD!\n");
 403                 ret = -1;
 404                 goto out;
 405         }
 406
 407         kvno = (krb5_kvno)ads_get_machine_kvno(ads, lp_netbios_name());
 408         if (kvno == -1) {
 409                 /* -1 indicates failure, everything else is OK */
 410                 DBG_WARNING("ads_get_machine_kvno failed to determine the "
 411                             "system's kvno.\n");
 412                 ret = -1;
 413                 goto out;
 414         }
 415
 416         salt_princ_s = kerberos_secrets_fetch_salt_princ();
 417         if (salt_princ_s == NULL) {
 418                 DBG_WARNING("kerberos_secrets_fetch_salt_princ() failed\n");
 419                 ret = -1;
 420                 goto out;
 421         }
 422
 423         ret = add_kt_entry_etypes(context, tmpctx, ads, salt_princ_s, keytab,
 424                                   kvno, srvPrinc, my_fqdn, &password,
 425                                   update_ads);
 426         if (ret != 0) {
 427                 goto out;
 428         }
 429
 430         if (ADS_ERR_OK(ads_get_additional_dns_hostnames(tmpctx, ads,
 431                                                         lp_netbios_name(),
 432                                                         &hostnames_array,
 433                                                         &num_hostnames))) {
 434                 size_t i;
 435
 436                 for (i = 0; i < num_hostnames; i++) {
 437
 438                         ret = add_kt_entry_etypes(context, tmpctx, ads,
 439                                                   salt_princ_s, keytab,
 440                                                   kvno, srvPrinc,
 441                                                   hostnames_array[i],
 442                                                   &password, update_ads);
 443                         if (ret != 0) {
 444                                 goto out;
 445                         }
 446                 }
 447         }
 448
 449 out:
 450         SAFE_FREE(salt_princ_s);
 451         TALLOC_FREE(tmpctx);
 452
 453         if (keytab) {
 454                 krb5_kt_close(context, keytab);
 455         }
 456         if (context) {
 457                 krb5_free_context(context);
 458         }
 459         return (int)ret;
 460 }
 461
 462 /**********************************************************************
 463  Flushes all entries from the system keytab.
 464 ***********************************************************************/
 465
 466 int ads_keytab_flush(ADS_STRUCT *ads)
 467 {
 468         krb5_error_code ret = 0;
 469         krb5_context context = NULL;
 470         krb5_keytab keytab = NULL;
 471         krb5_kvno kvno;
 472         ADS_STATUS aderr;
 473
 474         ret = smb_krb5_init_context_common(&context);
 475         if (ret) {
 476                 DBG_ERR("kerberos init context failed (%s)\n",
 477                         error_message(ret));
 478                 return ret;
 479         }
 480
 481         ret = ads_keytab_open(context, &keytab);
 482         if (ret != 0) {
 483                 goto out;
 484         }
 485
 486         kvno = (krb5_kvno)ads_get_machine_kvno(ads, lp_netbios_name());
 487         if (kvno == -1) {
 488                 /* -1 indicates a failure */
 489                 DEBUG(1, (__location__ ": Error determining the kvno.\n"));
 490                 ret = -1;
 491                 goto out;
 492         }
 493
 494         /* Seek and delete old keytab entries */
 495         ret = smb_krb5_kt_seek_and_delete_old_entries(context,
 496                                                       keytab,
 497                                                       kvno,
 498                                                       ENCTYPE_NULL,
 499                                                       NULL,
 500                                                       NULL,
 501                                                       true,
 502                                                       false);
 503         if (ret) {
 504                 goto out;
 505         }
 506
 507         aderr = ads_clear_service_principal_names(ads, lp_netbios_name());
 508         if (!ADS_ERR_OK(aderr)) {
 509                 DEBUG(1, (__location__ ": Error while clearing service "
 510                           "principal listings in LDAP.\n"));
 511                 ret = -1;
 512                 goto out;
 513         }
 514
 515 out:
 516         if (keytab) {
 517                 krb5_kt_close(context, keytab);
 518         }
 519         if (context) {
 520                 krb5_free_context(context);
 521         }
 522         return ret;
 523 }
 524
 525 /**********************************************************************
 526  Adds all the required service principals to the system keytab.
 527 ***********************************************************************/
 528
 529 int ads_keytab_create_default(ADS_STRUCT *ads)
 530 {
 531         krb5_error_code ret = 0;
 532         krb5_context context = NULL;
 533         krb5_keytab keytab = NULL;
 534         krb5_kt_cursor cursor = {0};
 535         krb5_keytab_entry kt_entry = {0};
 536         krb5_kvno kvno;
 537         size_t found = 0;
 538         char *sam_account_name, *upn;
 539         char **oldEntries = NULL, *princ_s[26];
 540         TALLOC_CTX *frame;
 541         char *machine_name;
 542         char **spn_array;
 543         size_t num_spns;
 544         size_t i;
 545         bool ok = false;
 546         ADS_STATUS status;
 547
 548         ZERO_STRUCT(kt_entry);
 549         ZERO_STRUCT(cursor);
 550
 551         frame = talloc_stackframe();
 552         if (frame == NULL) {
 553                 ret = -1;
 554                 goto done;
 555         }
 556
 557         status = ads_get_service_principal_names(frame,
 558                                                  ads,
 559                                                  lp_netbios_name(),
 560                                                  &spn_array,
 561                                                  &num_spns);
 562         if (!ADS_ERR_OK(status)) {
 563                 ret = -1;
 564                 goto done;
 565         }
 566
 567         for (i = 0; i < num_spns; i++) {
 568                 char *srv_princ;
 569                 char *p;
 570
 571                 srv_princ = strlower_talloc(frame, spn_array[i]);
 572                 if (srv_princ == NULL) {
 573                         ret = -1;
 574                         goto done;
 575                 }
 576
 577                 p = strchr_m(srv_princ, '/');
 578                 if (p == NULL) {
 579                         continue;
 580                 }
 581                 p[0] = '\0';
 582
 583                 /* Add the SPNs found on the DC */
 584                 ret = ads_keytab_add_entry(ads, srv_princ, false);
 585                 if (ret != 0) {
 586                         DEBUG(1, ("ads_keytab_add_entry failed while "
 587                                   "adding '%s' principal.\n",
 588                                   spn_array[i]));
 589                         goto done;
 590                 }
 591         }
 592
 593 #if 0   /* don't create the CIFS/... keytab entries since no one except smbd
 594            really needs them and we will fall back to verifying against
 595            secrets.tdb */
 596
 597         ret = ads_keytab_add_entry(ads, "cifs", false));
 598         if (ret != 0 ) {
 599                 DEBUG(1, (__location__ ": ads_keytab_add_entry failed while "
 600                           "adding 'cifs'.\n"));
 601                 return ret;
 602         }
 603 #endif
 604
 605         memset(princ_s, '\0', sizeof(princ_s));
 606
 607         ret = smb_krb5_init_context_common(&context);
 608         if (ret) {
 609                 DBG_ERR("kerberos init context failed (%s)\n",
 610                         error_message(ret));
 611                 goto done;
 612         }
 613
 614         machine_name = talloc_strdup(frame, lp_netbios_name());
 615         if (!machine_name) {
 616                 ret = -1;
 617                 goto done;
 618         }
 619
 620         /* now add the userPrincipalName and sAMAccountName entries */
 621         ok = ads_has_samaccountname(ads, frame, machine_name);
 622         if (!ok) {
 623                 DEBUG(0, (__location__ ": unable to determine machine "
 624                           "account's name in AD!\n"));
 625                 ret = -1;
 626                 goto done;
 627         }
 628
 629         /*
 630          * append '$' to netbios name so 'ads_keytab_add_entry' recognises
 631          * it as a machine account rather than a service or Windows SPN.
 632          */
 633         sam_account_name = talloc_asprintf(frame, "%s$",machine_name);
 634         if (sam_account_name == NULL) {
 635                 ret = -1;
 636                 goto done;
 637         }
 638         /* upper case the sAMAccountName to make it easier for apps to
 639            know what case to use in the keytab file */
 640         if (!strupper_m(sam_account_name)) {
 641                 ret = -1;
 642                 goto done;
 643         }
 644
 645         ret = ads_keytab_add_entry(ads, sam_account_name, false);
 646         if (ret != 0) {
 647                 DEBUG(1, (__location__ ": ads_keytab_add_entry() failed "
 648                           "while adding sAMAccountName (%s)\n",
 649                           sam_account_name));
 650                 goto done;
 651         }
 652
 653         /* remember that not every machine account will have a upn */
 654         upn = ads_get_upn(ads, frame, machine_name);
 655         if (upn) {
 656                 ret = ads_keytab_add_entry(ads, upn, false);
 657                 if (ret != 0) {
 658                         DEBUG(1, (__location__ ": ads_keytab_add_entry() "
 659                                   "failed while adding UPN (%s)\n", upn));
 660                         goto done;
 661                 }
 662         }
 663
 664         /* Now loop through the keytab and update any other existing entries */
 665         kvno = (krb5_kvno)ads_get_machine_kvno(ads, machine_name);
 666         if (kvno == (krb5_kvno)-1) {
 667                 DEBUG(1, (__location__ ": ads_get_machine_kvno() failed to "
 668                           "determine the system's kvno.\n"));
 669                 goto done;
 670         }
 671
 672         DEBUG(3, (__location__ ": Searching for keytab entries to preserve "
 673                   "and update.\n"));
 674
 675         ret = ads_keytab_open(context, &keytab);
 676         if (ret != 0) {
 677                 goto done;
 678         }
 679
 680         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 681         if (ret != KRB5_KT_END && ret != ENOENT ) {
 682                 while ((ret = krb5_kt_next_entry(context, keytab,
 683                                                  &kt_entry, &cursor)) == 0) {
 684                         smb_krb5_kt_free_entry(context, &kt_entry);
 685                         ZERO_STRUCT(kt_entry);
 686                         found++;
 687                 }
 688         }
 689         krb5_kt_end_seq_get(context, keytab, &cursor);
 690         ZERO_STRUCT(cursor);
 691
 692         /*
 693          * Hmmm. There is no "rewind" function for the keytab. This means we
 694          * have a race condition where someone else could add entries after
 695          * we've counted them. Re-open asap to minimise the race. JRA.
 696          */
 697         DEBUG(3, (__location__ ": Found %zd entries in the keytab.\n", found));
 698         if (!found) {
 699                 goto done;
 700         }
 701
 702         oldEntries = talloc_zero_array(frame, char *, found + 1);
 703         if (!oldEntries) {
 704                 DEBUG(1, (__location__ ": Failed to allocate space to store "
 705                           "the old keytab entries (talloc failed?).\n"));
 706                 ret = -1;
 707                 goto done;
 708         }
 709
 710         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 711         if (ret == KRB5_KT_END || ret == ENOENT) {
 712                 krb5_kt_end_seq_get(context, keytab, &cursor);
 713                 ZERO_STRUCT(cursor);
 714                 goto done;
 715         }
 716
 717         while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 718                 if (kt_entry.vno != kvno) {
 719                         char *ktprinc = NULL;
 720                         char *p;
 721
 722                         /* This returns a malloc'ed string in ktprinc. */
 723                         ret = smb_krb5_unparse_name(oldEntries, context,
 724                                                     kt_entry.principal,
 725                                                     &ktprinc);
 726                         if (ret) {
 727                                 DEBUG(1, (__location__
 728                                          ": smb_krb5_unparse_name failed "
 729                                          "(%s)\n", error_message(ret)));
 730                                 goto done;
 731                         }
 732                         /*
 733                          * From looking at the krb5 source they don't seem to
 734                          * take locale or mb strings into account.
 735                          * Maybe this is because they assume utf8 ?
 736                          * In this case we may need to convert from utf8 to
 737                          * mb charset here ? JRA.
 738                          */
 739                         p = strchr_m(ktprinc, '@');
 740                         if (p) {
 741                                 *p = '\0';
 742                         }
 743
 744                         p = strchr_m(ktprinc, '/');
 745                         if (p) {
 746                                 *p = '\0';
 747                         }
 748                         for (i = 0; i < found; i++) {
 749                                 if (!oldEntries[i]) {
 750                                         oldEntries[i] = ktprinc;
 751                                         break;
 752                                 }
 753                                 if (!strcmp(oldEntries[i], ktprinc)) {
 754                                         TALLOC_FREE(ktprinc);
 755                                         break;
 756                                 }
 757                         }
 758                         if (i == found) {
 759                                 TALLOC_FREE(ktprinc);
 760                         }
 761                 }
 762                 smb_krb5_kt_free_entry(context, &kt_entry);
 763                 ZERO_STRUCT(kt_entry);
 764         }
 765         krb5_kt_end_seq_get(context, keytab, &cursor);
 766         ZERO_STRUCT(cursor);
 767
 768         ret = 0;
 769         for (i = 0; oldEntries[i]; i++) {
 770                 ret |= ads_keytab_add_entry(ads, oldEntries[i], false);
 771                 TALLOC_FREE(oldEntries[i]);
 772         }
 773
 774 done:
 775         TALLOC_FREE(oldEntries);
 776         TALLOC_FREE(frame);
 777
 778         if (context) {
 779                 if (!all_zero((uint8_t *)&kt_entry, sizeof(kt_entry))) {
 780                         smb_krb5_kt_free_entry(context, &kt_entry);
 781                 }
 782                 if (!all_zero((uint8_t *)&cursor, sizeof(cursor)) && keytab) {
 783                         krb5_kt_end_seq_get(context, keytab, &cursor);
 784                 }
 785                 if (keytab) {
 786                         krb5_kt_close(context, keytab);
 787                 }
 788                 krb5_free_context(context);
 789         }
 790         return ret;
 791 }
 792
 793 #endif /* HAVE_ADS */
 794
 795 /**********************************************************************
 796  List system keytab.
 797 ***********************************************************************/
 798
 799 int ads_keytab_list(const char *keytab_name)
 800 {
 801         krb5_error_code ret = 0;
 802         krb5_context context = NULL;
 803         krb5_keytab keytab = NULL;
 804         krb5_kt_cursor cursor;
 805         krb5_keytab_entry kt_entry;
 806
 807         ZERO_STRUCT(kt_entry);
 808         ZERO_STRUCT(cursor);
 809
 810         ret = smb_krb5_init_context_common(&context);
 811         if (ret) {
 812                 DBG_ERR("kerberos init context failed (%s)\n",
 813                         error_message(ret));
 814                 return ret;
 815         }
 816
 817         if (keytab_name == NULL) {
 818 #ifdef HAVE_ADS
 819                 ret = ads_keytab_open(context, &keytab);
 820 #else
 821                 ret = ENOENT;
 822 #endif
 823         } else {
 824                 ret = smb_krb5_kt_open(context, keytab_name, False, &keytab);
 825         }
 826         if (ret) {
 827                 DEBUG(1, ("smb_krb5_kt_open failed (%s)\n",
 828                           error_message(ret)));
 829                 goto out;
 830         }
 831
 832         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 833         if (ret) {
 834                 ZERO_STRUCT(cursor);
 835                 goto out;
 836         }
 837
 838         printf("Vno  Type                                        Principal\n");
 839
 840         while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 841
 842                 char *princ_s = NULL;
 843                 char *etype_s = NULL;
 844                 krb5_enctype enctype = 0;
 845
 846                 ret = smb_krb5_unparse_name(talloc_tos(), context,
 847                                             kt_entry.principal, &princ_s);
 848                 if (ret) {
 849                         goto out;
 850                 }
 851
 852                 enctype = smb_krb5_kt_get_enctype_from_entry(&kt_entry);
 853
 854                 ret = smb_krb5_enctype_to_string(context, enctype, &etype_s);
 855                 if (ret &&
 856                     (asprintf(&etype_s, "UNKNOWN: %d", enctype) == -1)) {
 857                         TALLOC_FREE(princ_s);
 858                         goto out;
 859                 }
 860
 861                 printf("%3d  %-43s %s\n", kt_entry.vno, etype_s, princ_s);
 862
 863                 TALLOC_FREE(princ_s);
 864                 SAFE_FREE(etype_s);
 865
 866                 ret = smb_krb5_kt_free_entry(context, &kt_entry);
 867                 if (ret) {
 868                         goto out;
 869                 }
 870         }
 871
 872         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 873         if (ret) {
 874                 goto out;
 875         }
 876
 877         /* Ensure we don't double free. */
 878         ZERO_STRUCT(kt_entry);
 879         ZERO_STRUCT(cursor);
 880 out:
 881
 882         if (!all_zero((uint8_t *)&kt_entry, sizeof(kt_entry))) {
 883                 smb_krb5_kt_free_entry(context, &kt_entry);
 884         }
 885         if (!all_zero((uint8_t *)&cursor, sizeof(cursor)) && keytab) {
 886                 krb5_kt_end_seq_get(context, keytab, &cursor);
 887         }
 888
 889         if (keytab) {
 890                 krb5_kt_close(context, keytab);
 891         }
 892         if (context) {
 893                 krb5_free_context(context);
 894         }
 895         return ret;
 896 }
 897
 898 #endif /* HAVE_KRB5 */