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
  13    This program is free software; you can redistribute it and/or modify
  14    it under the terms of the GNU General Public License as published by
  15    the Free Software Foundation; either version 2 of the License, or
  16    (at your option) any later version.
  17
  18    This program is distributed in the hope that it will be useful,
  19    but WITHOUT ANY WARRANTY; without even the implied warranty of
  20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21    GNU General Public License for more details.
  22
  23    You should have received a copy of the GNU General Public License
  24    along with this program; if not, write to the Free Software
  25    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26 */
  27
  28 #include "includes.h"
  29
  30 #ifdef HAVE_KRB5
  31
  32 /**********************************************************************
  33  Adds a single service principal, i.e. 'host' to the system keytab
  34 ***********************************************************************/
  35
  36 int ads_keytab_add_entry(ADS_STRUCT *ads, const char *srvPrinc)
  37 {
  38         krb5_error_code ret = 0;
  39         krb5_context context = NULL;
  40         krb5_keytab keytab = NULL;
  41         krb5_kt_cursor cursor;
  42         krb5_keytab_entry kt_entry;
  43         krb5_principal princ = NULL;
  44         krb5_data password;
  45         krb5_enctype *enctypes = NULL;
  46         krb5_kvno kvno;
  47
  48         char *principal = NULL;
  49         char *princ_s = NULL;
  50         char *password_s = NULL;
  51 #ifndef MAX_KEYTAB_NAME_LEN
  52 #define MAX_KEYTAB_NAME_LEN 1100
  53 #endif
  54         char keytab_name[MAX_KEYTAB_NAME_LEN];          /* This MAX_NAME_LEN is a constant defined in krb5.h */
  55         fstring my_fqdn;
  56         int i;
  57         char *ktprinc = NULL;
  58
  59         ZERO_STRUCT(kt_entry);
  60         ZERO_STRUCT(cursor);
  61
  62         initialize_krb5_error_table();
  63         ret = krb5_init_context(&context);
  64         if (ret) {
  65                 DEBUG(1,("ads_keytab_add_entry: could not krb5_init_context: %s\n",error_message(ret)));
  66                 return -1;
  67         }
  68 #ifdef HAVE_WRFILE_KEYTAB       /* MIT */
  69         keytab_name[0] = 'W';
  70         keytab_name[1] = 'R';
  71         ret = krb5_kt_default_name(context, (char *) &keytab_name[2], MAX_KEYTAB_NAME_LEN - 4);
  72 #else                           /* Heimdal */
  73         ret = krb5_kt_default_name(context, (char *) &keytab_name[0], MAX_KEYTAB_NAME_LEN - 2);
  74 #endif
  75         if (ret) {
  76                 DEBUG(1,("ads_keytab_add_entry: krb5_kt_default_name failed (%s)\n", error_message(ret)));
  77                 goto out;
  78         }
  79         DEBUG(2,("ads_keytab_add_entry: Using default system keytab: %s\n", (char *) &keytab_name));
  80         ret = krb5_kt_resolve(context, (char *) &keytab_name, &keytab);
  81         if (ret) {
  82                 DEBUG(1,("ads_keytab_add_entry: krb5_kt_resolve failed (%s)\n", error_message(ret)));
  83                 goto out;
  84         }
  85
  86         /* retrieve the password */
  87         if (!secrets_init()) {
  88                 DEBUG(1,("ads_keytab_add_entry: secrets_init failed\n"));
  89                 ret = -1;
  90                 goto out;
  91         }
  92         password_s = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
  93         if (!password_s) {
  94                 DEBUG(1,("ads_keytab_add_entry: failed to fetch machine password\n"));
  95                 ret = -1;
  96                 goto out;
  97         }
  98         password.data = password_s;
  99         password.length = strlen(password_s);
 100
 101         /* Construct our principal */
 102         name_to_fqdn(my_fqdn, global_myname());
 103         strlower_m(my_fqdn);
 104         asprintf(&princ_s, "%s/%s@%s", srvPrinc, my_fqdn, lp_realm());
 105
 106         ret = krb5_parse_name(context, princ_s, &princ);
 107         if (ret) {
 108                 DEBUG(1,("ads_keytab_add_entry: krb5_parse_name(%s) failed (%s)\n", princ_s, error_message(ret)));
 109                 goto out;
 110         }
 111
 112         kvno = (krb5_kvno) ads_get_kvno(ads, global_myname());
 113         if (kvno == -1) {       /* -1 indicates failure, everything else is OK */
 114                 DEBUG(1,("ads_keytab_add_entry: ads_get_kvno failed to determine the system's kvno.\n"));
 115                 ret = -1;
 116                 goto out;
 117         }
 118
 119         /* Seek and delete old keytab entries */
 120         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 121         if (ret != KRB5_KT_END && ret != ENOENT ) {
 122                 DEBUG(3,("ads_keytab_add_entry: Will try to delete old keytab entries\n"));
 123                 while(!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
 124                         BOOL compare_ok = False;
 125
 126                         ret = krb5_unparse_name(context, kt_entry.principal, &ktprinc);
 127                         if (ret) {
 128                                 DEBUG(1,("ads_keytab_add_entry: krb5_unparse_name failed (%s)\n", error_message(ret)));
 129                                 goto out;
 130                         }
 131
 132                         /*---------------------------------------------------------------------------
 133                          * Save the entries with kvno - 1.   This is what microsoft does
 134                          * to allow people with existing sessions that have kvno - 1 to still
 135                          * work.   Otherwise, when the password for the machine changes, all
 136                          * kerberizied sessions will 'break' until either the client reboots or
 137                          * the client's session key expires and they get a new session ticket
 138                          * with the new kvno.
 139                          */
 140
 141 #ifdef HAVE_KRB5_KT_COMPARE
 142                         compare_ok = ((krb5_kt_compare(context, &kt_entry, princ, 0, 0) == True) && (kt_entry.vno != kvno - 1));
 143 #else
 144                         compare_ok = ((strcmp(ktprinc, princ_s) == 0) && (kt_entry.vno != kvno - 1));
 145 #endif
 146                         krb5_free_unparsed_name(context, ktprinc);
 147                         ktprinc = NULL;
 148
 149                         if (compare_ok) {
 150                                 DEBUG(3,("ads_keytab_add_entry: Found old entry for principal: %s (kvno %d) - trying to remove it.\n",
 151                                         princ_s, kt_entry.vno));
 152                                 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 153                                 ZERO_STRUCT(cursor);
 154                                 if (ret) {
 155                                         DEBUG(1,("ads_keytab_add_entry: krb5_kt_end_seq_get() failed (%s)\n",
 156                                                 error_message(ret)));
 157                                         goto out;
 158                                 }
 159                                 ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
 160                                 if (ret) {
 161                                         DEBUG(1,("ads_keytab_add_entry: krb5_kt_remove_entry failed (%s)\n",
 162                                                 error_message(ret)));
 163                                         goto out;
 164                                 }
 165                                 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 166                                 if (ret) {
 167                                         DEBUG(1,("ads_keytab_add_entry: krb5_kt_start_seq failed (%s)\n",
 168                                                 error_message(ret)));
 169                                         goto out;
 170                                 }
 171                                 ret = smb_krb5_kt_free_entry(context, &kt_entry);
 172                                 ZERO_STRUCT(kt_entry);
 173                                 if (ret) {
 174                                         DEBUG(1,("ads_keytab_add_entry: krb5_kt_remove_entry failed (%s)\n",
 175                                                 error_message(ret)));
 176                                         goto out;
 177                                 }
 178                                 continue;
 179                         }
 180
 181                         /* Not a match, just free this entry and continue. */
 182                         ret = smb_krb5_kt_free_entry(context, &kt_entry);
 183                         ZERO_STRUCT(kt_entry);
 184                         if (ret) {
 185                                 DEBUG(1,("ads_keytab_add_entry: smb_krb5_kt_free_entry failed (%s)\n", error_message(ret)));
 186                                 goto out;
 187                         }
 188                 }
 189
 190                 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 191                 ZERO_STRUCT(cursor);
 192                 if (ret) {
 193                         DEBUG(1,("ads_keytab_add_entry: krb5_kt_end_seq_get failed (%s)\n",error_message(ret)));
 194                         goto out;
 195                 }
 196         }
 197
 198         /* Ensure we don't double free. */
 199         ZERO_STRUCT(kt_entry);
 200         ZERO_STRUCT(cursor);
 201
 202         /* If we get here, we have deleted all the old entries with kvno's not equal to the current kvno-1. */
 203
 204         ret = get_kerberos_allowed_etypes(context,&enctypes);
 205         if (ret) {
 206                 DEBUG(1,("ads_keytab_add_entry: get_kerberos_allowed_etypes failed (%s)\n",error_message(ret)));
 207                 goto out;
 208         }
 209
 210         /* Now add keytab entries for all encryption types */
 211         for (i = 0; enctypes[i]; i++) {
 212                 krb5_keyblock *keyp;
 213
 214 #if !defined(HAVE_KRB5_KEYTAB_ENTRY_KEY) && !defined(HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK)
 215 #error krb5_keytab_entry has no key or keyblock member
 216 #endif
 217 #ifdef HAVE_KRB5_KEYTAB_ENTRY_KEY               /* MIT */
 218                 keyp = &kt_entry.key;
 219 #endif
 220 #ifdef HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK          /* Heimdal */
 221                 keyp = &kt_entry.keyblock;
 222 #endif
 223                 if (create_kerberos_key_from_string(context, princ, &password, keyp, enctypes[i])) {
 224                         continue;
 225                 }
 226
 227                 kt_entry.principal = princ;
 228                 kt_entry.vno       = kvno;
 229
 230                 DEBUG(3,("ads_keytab_add_entry: adding keytab entry for (%s) with encryption type (%d) and version (%d)\n",
 231                         princ_s, enctypes[i], kt_entry.vno));
 232                 ret = krb5_kt_add_entry(context, keytab, &kt_entry);
 233                 krb5_free_keyblock_contents(context, keyp);
 234                 ZERO_STRUCT(kt_entry);
 235                 if (ret) {
 236                         DEBUG(1,("ads_keytab_add_entry: adding entry to keytab failed (%s)\n", error_message(ret)));
 237                         goto out;
 238                 }
 239         }
 240
 241         krb5_kt_close(context, keytab);
 242         keytab = NULL; /* Done with keytab now. No double free. */
 243
 244         /* Update the LDAP with the SPN */
 245         DEBUG(3,("ads_keytab_add_entry: Attempting to add/update '%s'\n", princ_s));
 246         if (!ADS_ERR_OK(ads_add_service_principal_name(ads, global_myname(), srvPrinc))) {
 247                 DEBUG(1,("ads_keytab_add_entry: ads_add_service_principcal_name failed.\n"));
 248                 goto out;
 249         }
 250
 251 out:
 252
 253         SAFE_FREE(principal);
 254         SAFE_FREE(password_s);
 255         SAFE_FREE(princ_s);
 256
 257         {
 258                 krb5_keytab_entry zero_kt_entry;
 259                 ZERO_STRUCT(zero_kt_entry);
 260                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 261                         smb_krb5_kt_free_entry(context, &kt_entry);
 262                 }
 263         }
 264         if (princ) {
 265                 krb5_free_principal(context, princ);
 266         }
 267         if (enctypes) {
 268                 free_kerberos_etypes(context, enctypes);
 269         }
 270
 271         {
 272                 krb5_kt_cursor zero_csr;
 273                 ZERO_STRUCT(zero_csr);
 274                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 275                         krb5_kt_end_seq_get(context, keytab, &cursor);
 276                 }
 277         }
 278         if (keytab) {
 279                 krb5_kt_close(context, keytab);
 280         }
 281         if (context) {
 282                 krb5_free_context(context);
 283         }
 284         return (int)ret;
 285 }
 286
 287 /**********************************************************************
 288  Flushes all entries from the system keytab.
 289 ***********************************************************************/
 290
 291 int ads_keytab_flush(ADS_STRUCT *ads)
 292 {
 293         krb5_error_code ret = 0;
 294         krb5_context context = NULL;
 295         krb5_keytab keytab = NULL;
 296         krb5_kt_cursor cursor;
 297         krb5_keytab_entry kt_entry;
 298         krb5_kvno kvno;
 299         char keytab_name[MAX_KEYTAB_NAME_LEN];
 300
 301         ZERO_STRUCT(kt_entry);
 302         ZERO_STRUCT(cursor);
 303
 304         initialize_krb5_error_table();
 305         ret = krb5_init_context(&context);
 306         if (ret) {
 307                 DEBUG(1,("ads_keytab_flush: could not krb5_init_context: %s\n",error_message(ret)));
 308                 return ret;
 309         }
 310 #ifdef HAVE_WRFILE_KEYTAB
 311         keytab_name[0] = 'W';
 312         keytab_name[1] = 'R';
 313         ret = krb5_kt_default_name(context, (char *) &keytab_name[2], MAX_KEYTAB_NAME_LEN - 4);
 314 #else
 315         ret = krb5_kt_default_name(context, (char *) &keytab_name[0], MAX_KEYTAB_NAME_LEN - 2);
 316 #endif
 317         if (ret) {
 318                 DEBUG(1,("ads_keytab_flush: krb5_kt_default failed (%s)\n", error_message(ret)));
 319                 goto out;
 320         }
 321         DEBUG(3,("ads_keytab_flush: Using default keytab: %s\n", (char *) &keytab_name));
 322         ret = krb5_kt_resolve(context, (char *) &keytab_name, &keytab);
 323         if (ret) {
 324                 DEBUG(1,("ads_keytab_flush: krb5_kt_default failed (%s)\n", error_message(ret)));
 325                 goto out;
 326         }
 327         ret = krb5_kt_resolve(context, (char *) &keytab_name, &keytab);
 328         if (ret) {
 329                 DEBUG(1,("ads_keytab_flush: krb5_kt_default failed (%s)\n", error_message(ret)));
 330                 goto out;
 331         }
 332
 333         kvno = (krb5_kvno) ads_get_kvno(ads, global_myname());
 334         if (kvno == -1) {       /* -1 indicates a failure */
 335                 DEBUG(1,("ads_keytab_flush: Error determining the system's kvno.\n"));
 336                 goto out;
 337         }
 338
 339         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 340         if (ret != KRB5_KT_END && ret != ENOENT) {
 341                 while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
 342                         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 343                         ZERO_STRUCT(cursor);
 344                         if (ret) {
 345                                 DEBUG(1,("ads_keytab_flush: krb5_kt_end_seq_get() failed (%s)\n",error_message(ret)));
 346                                 goto out;
 347                         }
 348                         ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
 349                         if (ret) {
 350                                 DEBUG(1,("ads_keytab_flush: krb5_kt_remove_entry failed (%s)\n",error_message(ret)));
 351                                 goto out;
 352                         }
 353                         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 354                         if (ret) {
 355                                 DEBUG(1,("ads_keytab_flush: krb5_kt_start_seq failed (%s)\n",error_message(ret)));
 356                                 goto out;
 357                         }
 358                         ret = smb_krb5_kt_free_entry(context, &kt_entry);
 359                         ZERO_STRUCT(kt_entry);
 360                         if (ret) {
 361                                 DEBUG(1,("ads_keytab_flush: krb5_kt_remove_entry failed (%s)\n",error_message(ret)));
 362                                 goto out;
 363                         }
 364                 }
 365         }
 366
 367         /* Ensure we don't double free. */
 368         ZERO_STRUCT(kt_entry);
 369         ZERO_STRUCT(cursor);
 370
 371         if (!ADS_ERR_OK(ads_clear_service_principal_names(ads, global_myname()))) {
 372                 DEBUG(1,("ads_keytab_flush: Error while clearing service principal listings in LDAP.\n"));
 373                 goto out;
 374         }
 375
 376 out:
 377
 378         {
 379                 krb5_keytab_entry zero_kt_entry;
 380                 ZERO_STRUCT(zero_kt_entry);
 381                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 382                         smb_krb5_kt_free_entry(context, &kt_entry);
 383                 }
 384         }
 385         {
 386                 krb5_kt_cursor zero_csr;
 387                 ZERO_STRUCT(zero_csr);
 388                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 389                         krb5_kt_end_seq_get(context, keytab, &cursor);
 390                 }
 391         }
 392         if (keytab) {
 393                 krb5_kt_close(context, keytab);
 394         }
 395         if (context) {
 396                 krb5_free_context(context);
 397         }
 398         return ret;
 399 }
 400
 401 /**********************************************************************
 402  Adds all the required service principals to the system keytab.
 403 ***********************************************************************/
 404
 405 int ads_keytab_create_default(ADS_STRUCT *ads)
 406 {
 407         krb5_error_code ret = 0;
 408         krb5_context context = NULL;
 409         krb5_keytab keytab = NULL;
 410         krb5_kt_cursor cursor;
 411         krb5_keytab_entry kt_entry;
 412         krb5_kvno kvno;
 413         int i, found = 0;
 414         char **oldEntries = NULL;
 415
 416         ret = ads_keytab_add_entry(ads, "host");
 417         if (ret) {
 418                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding 'host'.\n"));
 419                 return ret;
 420         }
 421         ret = ads_keytab_add_entry(ads, "cifs");
 422         if (ret) {
 423                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding 'cifs'.\n"));
 424                 return ret;
 425         }
 426
 427         kvno = (krb5_kvno) ads_get_kvno(ads, global_myname());
 428         if (kvno == -1) {
 429                 DEBUG(1,("ads_keytab_create_default: ads_get_kvno failed to determine the system's kvno.\n"));
 430                 return -1;
 431         }
 432
 433         DEBUG(3,("ads_keytab_create_default: Searching for keytab entries to preserve and update.\n"));
 434         /* Now loop through the keytab and update any other existing entries... */
 435
 436         ZERO_STRUCT(kt_entry);
 437         ZERO_STRUCT(cursor);
 438
 439         initialize_krb5_error_table();
 440         ret = krb5_init_context(&context);
 441         if (ret) {
 442                 DEBUG(1,("ads_keytab_create_default: could not krb5_init_context: %s\n",error_message(ret)));
 443                 return ret;
 444         }
 445         ret = krb5_kt_default(context, &keytab);
 446         if (ret) {
 447                 DEBUG(1,("ads_keytab_create_default: krb5_kt_default failed (%s)\n",error_message(ret)));
 448                 goto done;
 449         }
 450
 451         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 452         if (ret != KRB5_KT_END && ret != ENOENT ) {
 453                 while ((ret = krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) == 0) {
 454                         smb_krb5_kt_free_entry(context, &kt_entry);
 455                         ZERO_STRUCT(kt_entry);
 456                         found++;
 457                 }
 458         }
 459         krb5_kt_end_seq_get(context, keytab, &cursor);
 460         ZERO_STRUCT(cursor);
 461
 462         /*
 463          * Hmmm. There is no "rewind" function for the keytab. This means we have a race condition
 464          * where someone else could add entries after we've counted them. Re-open asap to minimise
 465          * the race. JRA.
 466          */
 467
 468         DEBUG(3, ("ads_keytab_create_default: Found %d entries in the keytab.\n", found));
 469         if (!found) {
 470                 goto done;
 471         }
 472         oldEntries = (char **) malloc(found * sizeof(char *));
 473         if (!oldEntries) {
 474                 DEBUG(1,("ads_keytab_create_default: Failed to allocate space to store the old keytab entries (malloc failed?).\n"));
 475                 ret = -1;
 476                 goto done;
 477         }
 478         memset(oldEntries, '\0', found * sizeof(char *));
 479
 480         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 481         if (ret != KRB5_KT_END && ret != ENOENT ) {
 482                 while ((ret = krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) == 0) {
 483                         if (kt_entry.vno != kvno) {
 484                                 char *ktprinc = NULL;
 485                                 char *p;
 486
 487                                 /* This returns a malloc'ed string in ktprinc. */
 488                                 ret = krb5_unparse_name(context, kt_entry.principal, &ktprinc);
 489                                 if (ret) {
 490                                         DEBUG(1,("krb5_unparse_name failed (%s)\n", error_message(ret)));
 491                                         goto done;
 492                                 }
 493                                 /*
 494                                  * From looking at the krb5 source they don't seem to take locale
 495                                  * or mb strings into account. Maybe this is because they assume utf8 ?
 496                                  * In this case we may need to convert from utf8 to mb charset here ? JRA.
 497                                  */
 498                                 p = strchr_m(ktprinc, '/');
 499                                 if (p) {
 500                                         *p = '\0';
 501                                 }
 502                                 for (i = 0; i < found; i++) {
 503                                         if (!oldEntries[i]) {
 504                                                 oldEntries[i] = ktprinc;
 505                                                 break;
 506                                         }
 507                                         if (!strcmp(oldEntries[i], ktprinc)) {
 508                                                 krb5_free_unparsed_name(context, ktprinc);
 509                                                 break;
 510                                         }
 511                                 }
 512                                 if (i == found) {
 513                                         krb5_free_unparsed_name(context, ktprinc);
 514                                 }
 515                         }
 516                         smb_krb5_kt_free_entry(context, &kt_entry);
 517                         ZERO_STRUCT(kt_entry);
 518                 }
 519                 for (i = 0; oldEntries[i]; i++) {
 520                         ret |= ads_keytab_add_entry(ads, oldEntries[i]);
 521                         krb5_free_unparsed_name(context, oldEntries[i]);
 522                 }
 523                 krb5_kt_end_seq_get(context, keytab, &cursor);
 524         }
 525         ZERO_STRUCT(cursor);
 526
 527 done:
 528
 529         SAFE_FREE(oldEntries);
 530
 531         {
 532                 krb5_keytab_entry zero_kt_entry;
 533                 ZERO_STRUCT(zero_kt_entry);
 534                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 535                         smb_krb5_kt_free_entry(context, &kt_entry);
 536                 }
 537         }
 538         {
 539                 krb5_kt_cursor zero_csr;
 540                 ZERO_STRUCT(zero_csr);
 541                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 542                         krb5_kt_end_seq_get(context, keytab, &cursor);
 543                 }
 544         }
 545         if (keytab) {
 546                 krb5_kt_close(context, keytab);
 547         }
 548         if (context) {
 549                 krb5_free_context(context);
 550         }
 551         return ret;
 552 }
 553 #endif /* HAVE_KRB5 */