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 /**********************************************************************
 232  Adds a single service principal, i.e. 'host' to the system keytab
 233 ***********************************************************************/
 234
 235 int ads_keytab_add_entry(ADS_STRUCT *ads, const char *srvPrinc, bool update_ads)
 236 {
 237         krb5_error_code ret = 0;
 238         krb5_context context = NULL;
 239         krb5_keytab keytab = NULL;
 240         krb5_data password;
 241         krb5_kvno kvno;
 242         krb5_enctype enctypes[6] = {
 243                 ENCTYPE_DES_CBC_CRC,
 244                 ENCTYPE_DES_CBC_MD5,
 245 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
 246                 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
 247 #endif
 248 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
 249                 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
 250 #endif
 251                 ENCTYPE_ARCFOUR_HMAC,
 252                 0
 253         };
 254         char *princ_s = NULL;
 255         char *short_princ_s = NULL;
 256         char *salt_princ_s = NULL;
 257         char *password_s = NULL;
 258         char *my_fqdn;
 259         TALLOC_CTX *tmpctx = NULL;
 260         int i;
 261
 262         ret = smb_krb5_init_context_common(&context);
 263         if (ret) {
 264                 DBG_ERR("kerberos init context failed (%s)\n",
 265                         error_message(ret));
 266                 return -1;
 267         }
 268
 269         ret = ads_keytab_open(context, &keytab);
 270         if (ret != 0) {
 271                 goto out;
 272         }
 273
 274         /* retrieve the password */
 275         if (!secrets_init()) {
 276                 DEBUG(1, (__location__ ": secrets_init failed\n"));
 277                 ret = -1;
 278                 goto out;
 279         }
 280         password_s = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
 281         if (!password_s) {
 282                 DEBUG(1, (__location__ ": failed to fetch machine password\n"));
 283                 ret = -1;
 284                 goto out;
 285         }
 286         ZERO_STRUCT(password);
 287         password.data = password_s;
 288         password.length = strlen(password_s);
 289
 290         /* we need the dNSHostName value here */
 291         tmpctx = talloc_init(__location__);
 292         if (!tmpctx) {
 293                 DEBUG(0, (__location__ ": talloc_init() failed!\n"));
 294                 ret = -1;
 295                 goto out;
 296         }
 297
 298         my_fqdn = ads_get_dnshostname(ads, tmpctx, lp_netbios_name());
 299         if (!my_fqdn) {
 300                 DEBUG(0, (__location__ ": unable to determine machine "
 301                           "account's dns name in AD!\n"));
 302                 ret = -1;
 303                 goto out;
 304         }
 305
 306         /* make sure we have a single instance of a the computer account */
 307         if (!ads_has_samaccountname(ads, tmpctx, lp_netbios_name())) {
 308                 DEBUG(0, (__location__ ": unable to determine machine "
 309                           "account's short name in AD!\n"));
 310                 ret = -1;
 311                 goto out;
 312         }
 313
 314         /* Construct our principal */
 315         if (strchr_m(srvPrinc, '@')) {
 316                 /* It's a fully-named principal. */
 317                 princ_s = talloc_asprintf(tmpctx, "%s", srvPrinc);
 318                 if (!princ_s) {
 319                         ret = -1;
 320                         goto out;
 321                 }
 322         } else if (srvPrinc[strlen(srvPrinc)-1] == '$') {
 323                 /* It's the machine account, as used by smbclient clients. */
 324                 princ_s = talloc_asprintf(tmpctx, "%s@%s",
 325                                           srvPrinc, lp_realm());
 326                 if (!princ_s) {
 327                         ret = -1;
 328                         goto out;
 329                 }
 330         } else {
 331                 /* It's a normal service principal.  Add the SPN now so that we
 332                  * can obtain credentials for it and double-check the salt value
 333                  * used to generate the service's keys. */
 334
 335                 if (!service_or_spn_to_kerberos_princ(tmpctx,
 336                                                       srvPrinc,
 337                                                       my_fqdn,
 338                                                       &princ_s,
 339                                                       &short_princ_s)) {
 340                         ret = -1;
 341                         goto out;
 342                 }
 343
 344                 /* According to http://support.microsoft.com/kb/326985/en-us,
 345                    certain principal names are automatically mapped to the
 346                    host/... principal in the AD account.
 347                    So only create these in the keytab, not in AD.  --jerry */
 348
 349                 if (update_ads && !strequal(srvPrinc, "cifs") &&
 350                     !strequal(srvPrinc, "host")) {
 351                         if (!ads_set_machine_account_spns(tmpctx,
 352                                                           ads,
 353                                                           srvPrinc,
 354                                                           my_fqdn)) {
 355                                 ret = -1;
 356                                 goto out;
 357                         }
 358                 }
 359         }
 360
 361         kvno = (krb5_kvno)ads_get_machine_kvno(ads, lp_netbios_name());
 362         if (kvno == -1) {
 363                 /* -1 indicates failure, everything else is OK */
 364                 DEBUG(1, (__location__ ": ads_get_machine_kvno failed to "
 365                          "determine the system's kvno.\n"));
 366                 ret = -1;
 367                 goto out;
 368         }
 369
 370         salt_princ_s = kerberos_secrets_fetch_salt_princ();
 371         if (salt_princ_s == NULL) {
 372                 DBG_WARNING("kerberos_secrets_fetch_salt_princ() failed\n");
 373                 ret = -1;
 374                 goto out;
 375         }
 376
 377         for (i = 0; enctypes[i]; i++) {
 378
 379                 /* add the fqdn principal to the keytab */
 380                 ret = smb_krb5_kt_add_entry(context,
 381                                             keytab,
 382                                             kvno,
 383                                             princ_s,
 384                                             salt_princ_s,
 385                                             enctypes[i],
 386                                             &password,
 387                                             false,
 388                                             false);
 389                 if (ret) {
 390                         DEBUG(1, (__location__ ": Failed to add entry to keytab\n"));
 391                         goto out;
 392                 }
 393
 394                 /* add the short principal name if we have one */
 395                 if (short_princ_s) {
 396                         ret = smb_krb5_kt_add_entry(context,
 397                                                     keytab,
 398                                                     kvno,
 399                                                     short_princ_s,
 400                                                     salt_princ_s,
 401                                                     enctypes[i],
 402                                                     &password,
 403                                                     false,
 404                                                     false);
 405                         if (ret) {
 406                                 DEBUG(1, (__location__
 407                                           ": Failed to add short entry to keytab\n"));
 408                                 goto out;
 409                         }
 410                 }
 411         }
 412
 413 out:
 414         SAFE_FREE(salt_princ_s);
 415         TALLOC_FREE(tmpctx);
 416
 417         if (keytab) {
 418                 krb5_kt_close(context, keytab);
 419         }
 420         if (context) {
 421                 krb5_free_context(context);
 422         }
 423         return (int)ret;
 424 }
 425
 426 /**********************************************************************
 427  Flushes all entries from the system keytab.
 428 ***********************************************************************/
 429
 430 int ads_keytab_flush(ADS_STRUCT *ads)
 431 {
 432         krb5_error_code ret = 0;
 433         krb5_context context = NULL;
 434         krb5_keytab keytab = NULL;
 435         krb5_kvno kvno;
 436         ADS_STATUS aderr;
 437
 438         ret = smb_krb5_init_context_common(&context);
 439         if (ret) {
 440                 DBG_ERR("kerberos init context failed (%s)\n",
 441                         error_message(ret));
 442                 return ret;
 443         }
 444
 445         ret = ads_keytab_open(context, &keytab);
 446         if (ret != 0) {
 447                 goto out;
 448         }
 449
 450         kvno = (krb5_kvno)ads_get_machine_kvno(ads, lp_netbios_name());
 451         if (kvno == -1) {
 452                 /* -1 indicates a failure */
 453                 DEBUG(1, (__location__ ": Error determining the kvno.\n"));
 454                 ret = -1;
 455                 goto out;
 456         }
 457
 458         /* Seek and delete old keytab entries */
 459         ret = smb_krb5_kt_seek_and_delete_old_entries(context,
 460                                                       keytab,
 461                                                       kvno,
 462                                                       ENCTYPE_NULL,
 463                                                       NULL,
 464                                                       NULL,
 465                                                       true,
 466                                                       false);
 467         if (ret) {
 468                 goto out;
 469         }
 470
 471         aderr = ads_clear_service_principal_names(ads, lp_netbios_name());
 472         if (!ADS_ERR_OK(aderr)) {
 473                 DEBUG(1, (__location__ ": Error while clearing service "
 474                           "principal listings in LDAP.\n"));
 475                 ret = -1;
 476                 goto out;
 477         }
 478
 479 out:
 480         if (keytab) {
 481                 krb5_kt_close(context, keytab);
 482         }
 483         if (context) {
 484                 krb5_free_context(context);
 485         }
 486         return ret;
 487 }
 488
 489 /**********************************************************************
 490  Adds all the required service principals to the system keytab.
 491 ***********************************************************************/
 492
 493 int ads_keytab_create_default(ADS_STRUCT *ads)
 494 {
 495         krb5_error_code ret = 0;
 496         krb5_context context = NULL;
 497         krb5_keytab keytab = NULL;
 498         krb5_kt_cursor cursor = {0};
 499         krb5_keytab_entry kt_entry = {0};
 500         krb5_kvno kvno;
 501         size_t found = 0;
 502         char *sam_account_name, *upn;
 503         char **oldEntries = NULL, *princ_s[26];
 504         TALLOC_CTX *frame;
 505         char *machine_name;
 506         char **spn_array;
 507         size_t num_spns;
 508         size_t i;
 509         bool ok = false;
 510         ADS_STATUS status;
 511
 512         ZERO_STRUCT(kt_entry);
 513         ZERO_STRUCT(cursor);
 514
 515         frame = talloc_stackframe();
 516         if (frame == NULL) {
 517                 ret = -1;
 518                 goto done;
 519         }
 520
 521         status = ads_get_service_principal_names(frame,
 522                                                  ads,
 523                                                  lp_netbios_name(),
 524                                                  &spn_array,
 525                                                  &num_spns);
 526         if (!ADS_ERR_OK(status)) {
 527                 ret = -1;
 528                 goto done;
 529         }
 530
 531         for (i = 0; i < num_spns; i++) {
 532                 char *srv_princ;
 533                 char *p;
 534
 535                 srv_princ = strlower_talloc(frame, spn_array[i]);
 536                 if (srv_princ == NULL) {
 537                         ret = -1;
 538                         goto done;
 539                 }
 540
 541                 p = strchr_m(srv_princ, '/');
 542                 if (p == NULL) {
 543                         continue;
 544                 }
 545                 p[0] = '\0';
 546
 547                 /* Add the SPNs found on the DC */
 548                 ret = ads_keytab_add_entry(ads, srv_princ, false);
 549                 if (ret != 0) {
 550                         DEBUG(1, ("ads_keytab_add_entry failed while "
 551                                   "adding '%s' principal.\n",
 552                                   spn_array[i]));
 553                         goto done;
 554                 }
 555         }
 556
 557 #if 0   /* don't create the CIFS/... keytab entries since no one except smbd
 558            really needs them and we will fall back to verifying against
 559            secrets.tdb */
 560
 561         ret = ads_keytab_add_entry(ads, "cifs", false));
 562         if (ret != 0 ) {
 563                 DEBUG(1, (__location__ ": ads_keytab_add_entry failed while "
 564                           "adding 'cifs'.\n"));
 565                 return ret;
 566         }
 567 #endif
 568
 569         memset(princ_s, '\0', sizeof(princ_s));
 570
 571         ret = smb_krb5_init_context_common(&context);
 572         if (ret) {
 573                 DBG_ERR("kerberos init context failed (%s)\n",
 574                         error_message(ret));
 575                 goto done;
 576         }
 577
 578         machine_name = talloc_strdup(frame, lp_netbios_name());
 579         if (!machine_name) {
 580                 ret = -1;
 581                 goto done;
 582         }
 583
 584         /* now add the userPrincipalName and sAMAccountName entries */
 585         ok = ads_has_samaccountname(ads, frame, machine_name);
 586         if (!ok) {
 587                 DEBUG(0, (__location__ ": unable to determine machine "
 588                           "account's name in AD!\n"));
 589                 ret = -1;
 590                 goto done;
 591         }
 592
 593         /*
 594          * append '$' to netbios name so 'ads_keytab_add_entry' recognises
 595          * it as a machine account rather than a service or Windows SPN.
 596          */
 597         sam_account_name = talloc_asprintf(frame, "%s$",machine_name);
 598         if (sam_account_name == NULL) {
 599                 ret = -1;
 600                 goto done;
 601         }
 602         /* upper case the sAMAccountName to make it easier for apps to
 603            know what case to use in the keytab file */
 604         if (!strupper_m(sam_account_name)) {
 605                 ret = -1;
 606                 goto done;
 607         }
 608
 609         ret = ads_keytab_add_entry(ads, sam_account_name, false);
 610         if (ret != 0) {
 611                 DEBUG(1, (__location__ ": ads_keytab_add_entry() failed "
 612                           "while adding sAMAccountName (%s)\n",
 613                           sam_account_name));
 614                 goto done;
 615         }
 616
 617         /* remember that not every machine account will have a upn */
 618         upn = ads_get_upn(ads, frame, machine_name);
 619         if (upn) {
 620                 ret = ads_keytab_add_entry(ads, upn, false);
 621                 if (ret != 0) {
 622                         DEBUG(1, (__location__ ": ads_keytab_add_entry() "
 623                                   "failed while adding UPN (%s)\n", upn));
 624                         goto done;
 625                 }
 626         }
 627
 628         /* Now loop through the keytab and update any other existing entries */
 629         kvno = (krb5_kvno)ads_get_machine_kvno(ads, machine_name);
 630         if (kvno == (krb5_kvno)-1) {
 631                 DEBUG(1, (__location__ ": ads_get_machine_kvno() failed to "
 632                           "determine the system's kvno.\n"));
 633                 goto done;
 634         }
 635
 636         DEBUG(3, (__location__ ": Searching for keytab entries to preserve "
 637                   "and update.\n"));
 638
 639         ret = ads_keytab_open(context, &keytab);
 640         if (ret != 0) {
 641                 goto done;
 642         }
 643
 644         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 645         if (ret != KRB5_KT_END && ret != ENOENT ) {
 646                 while ((ret = krb5_kt_next_entry(context, keytab,
 647                                                  &kt_entry, &cursor)) == 0) {
 648                         smb_krb5_kt_free_entry(context, &kt_entry);
 649                         ZERO_STRUCT(kt_entry);
 650                         found++;
 651                 }
 652         }
 653         krb5_kt_end_seq_get(context, keytab, &cursor);
 654         ZERO_STRUCT(cursor);
 655
 656         /*
 657          * Hmmm. There is no "rewind" function for the keytab. This means we
 658          * have a race condition where someone else could add entries after
 659          * we've counted them. Re-open asap to minimise the race. JRA.
 660          */
 661         DEBUG(3, (__location__ ": Found %zd entries in the keytab.\n", found));
 662         if (!found) {
 663                 goto done;
 664         }
 665
 666         oldEntries = talloc_zero_array(frame, char *, found + 1);
 667         if (!oldEntries) {
 668                 DEBUG(1, (__location__ ": Failed to allocate space to store "
 669                           "the old keytab entries (talloc failed?).\n"));
 670                 ret = -1;
 671                 goto done;
 672         }
 673
 674         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 675         if (ret == KRB5_KT_END || ret == ENOENT) {
 676                 krb5_kt_end_seq_get(context, keytab, &cursor);
 677                 ZERO_STRUCT(cursor);
 678                 goto done;
 679         }
 680
 681         while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 682                 if (kt_entry.vno != kvno) {
 683                         char *ktprinc = NULL;
 684                         char *p;
 685
 686                         /* This returns a malloc'ed string in ktprinc. */
 687                         ret = smb_krb5_unparse_name(oldEntries, context,
 688                                                     kt_entry.principal,
 689                                                     &ktprinc);
 690                         if (ret) {
 691                                 DEBUG(1, (__location__
 692                                          ": smb_krb5_unparse_name failed "
 693                                          "(%s)\n", error_message(ret)));
 694                                 goto done;
 695                         }
 696                         /*
 697                          * From looking at the krb5 source they don't seem to
 698                          * take locale or mb strings into account.
 699                          * Maybe this is because they assume utf8 ?
 700                          * In this case we may need to convert from utf8 to
 701                          * mb charset here ? JRA.
 702                          */
 703                         p = strchr_m(ktprinc, '@');
 704                         if (p) {
 705                                 *p = '\0';
 706                         }
 707
 708                         p = strchr_m(ktprinc, '/');
 709                         if (p) {
 710                                 *p = '\0';
 711                         }
 712                         for (i = 0; i < found; i++) {
 713                                 if (!oldEntries[i]) {
 714                                         oldEntries[i] = ktprinc;
 715                                         break;
 716                                 }
 717                                 if (!strcmp(oldEntries[i], ktprinc)) {
 718                                         TALLOC_FREE(ktprinc);
 719                                         break;
 720                                 }
 721                         }
 722                         if (i == found) {
 723                                 TALLOC_FREE(ktprinc);
 724                         }
 725                 }
 726                 smb_krb5_kt_free_entry(context, &kt_entry);
 727                 ZERO_STRUCT(kt_entry);
 728         }
 729         krb5_kt_end_seq_get(context, keytab, &cursor);
 730         ZERO_STRUCT(cursor);
 731
 732         ret = 0;
 733         for (i = 0; oldEntries[i]; i++) {
 734                 ret |= ads_keytab_add_entry(ads, oldEntries[i], false);
 735                 TALLOC_FREE(oldEntries[i]);
 736         }
 737
 738 done:
 739         TALLOC_FREE(oldEntries);
 740         TALLOC_FREE(frame);
 741
 742         if (context) {
 743                 if (!all_zero((uint8_t *)&kt_entry, sizeof(kt_entry))) {
 744                         smb_krb5_kt_free_entry(context, &kt_entry);
 745                 }
 746                 if (!all_zero((uint8_t *)&cursor, sizeof(cursor)) && keytab) {
 747                         krb5_kt_end_seq_get(context, keytab, &cursor);
 748                 }
 749                 if (keytab) {
 750                         krb5_kt_close(context, keytab);
 751                 }
 752                 krb5_free_context(context);
 753         }
 754         return ret;
 755 }
 756
 757 #endif /* HAVE_ADS */
 758
 759 /**********************************************************************
 760  List system keytab.
 761 ***********************************************************************/
 762
 763 int ads_keytab_list(const char *keytab_name)
 764 {
 765         krb5_error_code ret = 0;
 766         krb5_context context = NULL;
 767         krb5_keytab keytab = NULL;
 768         krb5_kt_cursor cursor;
 769         krb5_keytab_entry kt_entry;
 770
 771         ZERO_STRUCT(kt_entry);
 772         ZERO_STRUCT(cursor);
 773
 774         ret = smb_krb5_init_context_common(&context);
 775         if (ret) {
 776                 DBG_ERR("kerberos init context failed (%s)\n",
 777                         error_message(ret));
 778                 return ret;
 779         }
 780
 781         if (keytab_name == NULL) {
 782 #ifdef HAVE_ADS
 783                 ret = ads_keytab_open(context, &keytab);
 784 #else
 785                 ret = ENOENT;
 786 #endif
 787         } else {
 788                 ret = smb_krb5_kt_open(context, keytab_name, False, &keytab);
 789         }
 790         if (ret) {
 791                 DEBUG(1, ("smb_krb5_kt_open failed (%s)\n",
 792                           error_message(ret)));
 793                 goto out;
 794         }
 795
 796         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 797         if (ret) {
 798                 ZERO_STRUCT(cursor);
 799                 goto out;
 800         }
 801
 802         printf("Vno  Type                                        Principal\n");
 803
 804         while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 805
 806                 char *princ_s = NULL;
 807                 char *etype_s = NULL;
 808                 krb5_enctype enctype = 0;
 809
 810                 ret = smb_krb5_unparse_name(talloc_tos(), context,
 811                                             kt_entry.principal, &princ_s);
 812                 if (ret) {
 813                         goto out;
 814                 }
 815
 816                 enctype = smb_krb5_kt_get_enctype_from_entry(&kt_entry);
 817
 818                 ret = smb_krb5_enctype_to_string(context, enctype, &etype_s);
 819                 if (ret &&
 820                     (asprintf(&etype_s, "UNKNOWN: %d\n", enctype) == -1)) {
 821                         TALLOC_FREE(princ_s);
 822                         goto out;
 823                 }
 824
 825                 printf("%3d  %-43s %s\n", kt_entry.vno, etype_s, princ_s);
 826
 827                 TALLOC_FREE(princ_s);
 828                 SAFE_FREE(etype_s);
 829
 830                 ret = smb_krb5_kt_free_entry(context, &kt_entry);
 831                 if (ret) {
 832                         goto out;
 833                 }
 834         }
 835
 836         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 837         if (ret) {
 838                 goto out;
 839         }
 840
 841         /* Ensure we don't double free. */
 842         ZERO_STRUCT(kt_entry);
 843         ZERO_STRUCT(cursor);
 844 out:
 845
 846         if (!all_zero((uint8_t *)&kt_entry, sizeof(kt_entry))) {
 847                 smb_krb5_kt_free_entry(context, &kt_entry);
 848         }
 849         if (!all_zero((uint8_t *)&cursor, sizeof(cursor)) && keytab) {
 850                 krb5_kt_end_seq_get(context, keytab, &cursor);
 851         }
 852
 853         if (keytab) {
 854                 krb5_kt_close(context, keytab);
 855         }
 856         if (context) {
 857                 krb5_free_context(context);
 858         }
 859         return ret;
 860 }
 861
 862 #endif /* HAVE_KRB5 */