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
 105         if (strchr_m(srvPrinc, '@')) {
 106                 /* It's a fully-named principal. */
 107                 asprintf(&princ_s, "%s", srvPrinc);
 108         } else if (srvPrinc[strlen(srvPrinc)-1] == '$') {
 109                 /* It's the machine account, as used by smbclient clients. */
 110                 asprintf(&princ_s, "%s@%s", srvPrinc, lp_realm());
 111         } else {
 112                 /* It's a normal service principal.  Add the SPN now so that we
 113                  * can obtain credentials for it and double-check the salt value
 114                  * used to generate the service's keys. */
 115                 asprintf(&princ_s, "%s/%s@%s", srvPrinc, my_fqdn, lp_realm());
 116                 /* Update the directory with the SPN */
 117                 DEBUG(3,("ads_keytab_add_entry: Attempting to add/update '%s'\n", princ_s));
 118                 if (!ADS_ERR_OK(ads_add_service_principal_name(ads, global_myname(), srvPrinc))) {
 119                         DEBUG(1,("ads_keytab_add_entry: ads_add_service_principal_name failed.\n"));
 120                         goto out;
 121                 }
 122         }
 123
 124         ret = get_kerberos_allowed_etypes(context,&enctypes);
 125         if (ret) {
 126                 DEBUG(1,("ads_keytab_add_entry: get_kerberos_allowed_etypes failed (%s)\n",error_message(ret)));
 127                 goto out;
 128         }
 129
 130         /* Guess at how the KDC is salting keys for this principal. */
 131         kerberos_derive_salting_principal(context, NULL, enctypes, princ_s);
 132
 133         ret = krb5_parse_name(context, princ_s, &princ);
 134         if (ret) {
 135                 DEBUG(1,("ads_keytab_add_entry: krb5_parse_name(%s) failed (%s)\n", princ_s, error_message(ret)));
 136                 goto out;
 137         }
 138
 139         kvno = (krb5_kvno) ads_get_kvno(ads, global_myname());
 140         if (kvno == -1) {       /* -1 indicates failure, everything else is OK */
 141                 DEBUG(1,("ads_keytab_add_entry: ads_get_kvno failed to determine the system's kvno.\n"));
 142                 ret = -1;
 143                 goto out;
 144         }
 145
 146         /* Seek and delete old keytab entries */
 147         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 148         if (ret != KRB5_KT_END && ret != ENOENT ) {
 149                 DEBUG(3,("ads_keytab_add_entry: Will try to delete old keytab entries\n"));
 150                 while(!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
 151                         BOOL compare_ok = False;
 152
 153                         ret = krb5_unparse_name(context, kt_entry.principal, &ktprinc);
 154                         if (ret) {
 155                                 DEBUG(1,("ads_keytab_add_entry: krb5_unparse_name failed (%s)\n", error_message(ret)));
 156                                 goto out;
 157                         }
 158
 159                         /*---------------------------------------------------------------------------
 160                          * Save the entries with kvno - 1.   This is what microsoft does
 161                          * to allow people with existing sessions that have kvno - 1 to still
 162                          * work.   Otherwise, when the password for the machine changes, all
 163                          * kerberizied sessions will 'break' until either the client reboots or
 164                          * the client's session key expires and they get a new session ticket
 165                          * with the new kvno.
 166                          */
 167
 168 #ifdef HAVE_KRB5_KT_COMPARE
 169                         compare_ok = ((krb5_kt_compare(context, &kt_entry, princ, 0, 0) == True) && (kt_entry.vno != kvno - 1));
 170 #else
 171                         compare_ok = ((strcmp(ktprinc, princ_s) == 0) && (kt_entry.vno != kvno - 1));
 172 #endif
 173                         krb5_free_unparsed_name(context, ktprinc);
 174                         ktprinc = NULL;
 175
 176                         if (compare_ok) {
 177                                 DEBUG(3,("ads_keytab_add_entry: Found old entry for principal: %s (kvno %d) - trying to remove it.\n",
 178                                         princ_s, kt_entry.vno));
 179                                 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 180                                 ZERO_STRUCT(cursor);
 181                                 if (ret) {
 182                                         DEBUG(1,("ads_keytab_add_entry: krb5_kt_end_seq_get() failed (%s)\n",
 183                                                 error_message(ret)));
 184                                         goto out;
 185                                 }
 186                                 ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
 187                                 if (ret) {
 188                                         DEBUG(1,("ads_keytab_add_entry: krb5_kt_remove_entry failed (%s)\n",
 189                                                 error_message(ret)));
 190                                         goto out;
 191                                 }
 192                                 ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 193                                 if (ret) {
 194                                         DEBUG(1,("ads_keytab_add_entry: krb5_kt_start_seq failed (%s)\n",
 195                                                 error_message(ret)));
 196                                         goto out;
 197                                 }
 198                                 ret = smb_krb5_kt_free_entry(context, &kt_entry);
 199                                 ZERO_STRUCT(kt_entry);
 200                                 if (ret) {
 201                                         DEBUG(1,("ads_keytab_add_entry: krb5_kt_remove_entry failed (%s)\n",
 202                                                 error_message(ret)));
 203                                         goto out;
 204                                 }
 205                                 continue;
 206                         }
 207
 208                         /* Not a match, just free this entry and continue. */
 209                         ret = smb_krb5_kt_free_entry(context, &kt_entry);
 210                         ZERO_STRUCT(kt_entry);
 211                         if (ret) {
 212                                 DEBUG(1,("ads_keytab_add_entry: smb_krb5_kt_free_entry failed (%s)\n", error_message(ret)));
 213                                 goto out;
 214                         }
 215                 }
 216
 217                 ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 218                 ZERO_STRUCT(cursor);
 219                 if (ret) {
 220                         DEBUG(1,("ads_keytab_add_entry: krb5_kt_end_seq_get failed (%s)\n",error_message(ret)));
 221                         goto out;
 222                 }
 223         }
 224
 225         /* Ensure we don't double free. */
 226         ZERO_STRUCT(kt_entry);
 227         ZERO_STRUCT(cursor);
 228
 229         /* If we get here, we have deleted all the old entries with kvno's not equal to the current kvno-1. */
 230
 231         /* Now add keytab entries for all encryption types */
 232         for (i = 0; enctypes[i]; i++) {
 233                 krb5_keyblock *keyp;
 234
 235 #if !defined(HAVE_KRB5_KEYTAB_ENTRY_KEY) && !defined(HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK)
 236 #error krb5_keytab_entry has no key or keyblock member
 237 #endif
 238 #ifdef HAVE_KRB5_KEYTAB_ENTRY_KEY               /* MIT */
 239                 keyp = &kt_entry.key;
 240 #endif
 241 #ifdef HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK          /* Heimdal */
 242                 keyp = &kt_entry.keyblock;
 243 #endif
 244                 if (create_kerberos_key_from_string(context, princ, &password, keyp, enctypes[i])) {
 245                         continue;
 246                 }
 247
 248                 kt_entry.principal = princ;
 249                 kt_entry.vno       = kvno;
 250
 251                 DEBUG(3,("ads_keytab_add_entry: adding keytab entry for (%s) with encryption type (%d) and version (%d)\n",
 252                         princ_s, enctypes[i], kt_entry.vno));
 253                 ret = krb5_kt_add_entry(context, keytab, &kt_entry);
 254                 krb5_free_keyblock_contents(context, keyp);
 255                 ZERO_STRUCT(kt_entry);
 256                 if (ret) {
 257                         DEBUG(1,("ads_keytab_add_entry: adding entry to keytab failed (%s)\n", error_message(ret)));
 258                         goto out;
 259                 }
 260         }
 261
 262         krb5_kt_close(context, keytab);
 263         keytab = NULL; /* Done with keytab now. No double free. */
 264
 265 out:
 266
 267         SAFE_FREE(principal);
 268         SAFE_FREE(password_s);
 269         SAFE_FREE(princ_s);
 270
 271         {
 272                 krb5_keytab_entry zero_kt_entry;
 273                 ZERO_STRUCT(zero_kt_entry);
 274                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 275                         smb_krb5_kt_free_entry(context, &kt_entry);
 276                 }
 277         }
 278         if (princ) {
 279                 krb5_free_principal(context, princ);
 280         }
 281         if (enctypes) {
 282                 free_kerberos_etypes(context, enctypes);
 283         }
 284
 285         {
 286                 krb5_kt_cursor zero_csr;
 287                 ZERO_STRUCT(zero_csr);
 288                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 289                         krb5_kt_end_seq_get(context, keytab, &cursor);
 290                 }
 291         }
 292         if (keytab) {
 293                 krb5_kt_close(context, keytab);
 294         }
 295         if (context) {
 296                 krb5_free_context(context);
 297         }
 298         return (int)ret;
 299 }
 300
 301 /**********************************************************************
 302  Flushes all entries from the system keytab.
 303 ***********************************************************************/
 304
 305 int ads_keytab_flush(ADS_STRUCT *ads)
 306 {
 307         krb5_error_code ret = 0;
 308         krb5_context context = NULL;
 309         krb5_keytab keytab = NULL;
 310         krb5_kt_cursor cursor;
 311         krb5_keytab_entry kt_entry;
 312         krb5_kvno kvno;
 313         char keytab_name[MAX_KEYTAB_NAME_LEN];
 314
 315         ZERO_STRUCT(kt_entry);
 316         ZERO_STRUCT(cursor);
 317
 318         initialize_krb5_error_table();
 319         ret = krb5_init_context(&context);
 320         if (ret) {
 321                 DEBUG(1,("ads_keytab_flush: could not krb5_init_context: %s\n",error_message(ret)));
 322                 return ret;
 323         }
 324 #ifdef HAVE_WRFILE_KEYTAB
 325         keytab_name[0] = 'W';
 326         keytab_name[1] = 'R';
 327         ret = krb5_kt_default_name(context, (char *) &keytab_name[2], MAX_KEYTAB_NAME_LEN - 4);
 328 #else
 329         ret = krb5_kt_default_name(context, (char *) &keytab_name[0], MAX_KEYTAB_NAME_LEN - 2);
 330 #endif
 331         if (ret) {
 332                 DEBUG(1,("ads_keytab_flush: krb5_kt_default failed (%s)\n", error_message(ret)));
 333                 goto out;
 334         }
 335         DEBUG(3,("ads_keytab_flush: Using default keytab: %s\n", (char *) &keytab_name));
 336         ret = krb5_kt_resolve(context, (char *) &keytab_name, &keytab);
 337         if (ret) {
 338                 DEBUG(1,("ads_keytab_flush: krb5_kt_default failed (%s)\n", error_message(ret)));
 339                 goto out;
 340         }
 341         ret = krb5_kt_resolve(context, (char *) &keytab_name, &keytab);
 342         if (ret) {
 343                 DEBUG(1,("ads_keytab_flush: krb5_kt_default failed (%s)\n", error_message(ret)));
 344                 goto out;
 345         }
 346
 347         kvno = (krb5_kvno) ads_get_kvno(ads, global_myname());
 348         if (kvno == -1) {       /* -1 indicates a failure */
 349                 DEBUG(1,("ads_keytab_flush: Error determining the system's kvno.\n"));
 350                 goto out;
 351         }
 352
 353         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 354         if (ret != KRB5_KT_END && ret != ENOENT) {
 355                 while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
 356                         ret = krb5_kt_end_seq_get(context, keytab, &cursor);
 357                         ZERO_STRUCT(cursor);
 358                         if (ret) {
 359                                 DEBUG(1,("ads_keytab_flush: krb5_kt_end_seq_get() failed (%s)\n",error_message(ret)));
 360                                 goto out;
 361                         }
 362                         ret = krb5_kt_remove_entry(context, keytab, &kt_entry);
 363                         if (ret) {
 364                                 DEBUG(1,("ads_keytab_flush: krb5_kt_remove_entry failed (%s)\n",error_message(ret)));
 365                                 goto out;
 366                         }
 367                         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 368                         if (ret) {
 369                                 DEBUG(1,("ads_keytab_flush: krb5_kt_start_seq failed (%s)\n",error_message(ret)));
 370                                 goto out;
 371                         }
 372                         ret = smb_krb5_kt_free_entry(context, &kt_entry);
 373                         ZERO_STRUCT(kt_entry);
 374                         if (ret) {
 375                                 DEBUG(1,("ads_keytab_flush: krb5_kt_remove_entry failed (%s)\n",error_message(ret)));
 376                                 goto out;
 377                         }
 378                 }
 379         }
 380
 381         /* Ensure we don't double free. */
 382         ZERO_STRUCT(kt_entry);
 383         ZERO_STRUCT(cursor);
 384
 385         if (!ADS_ERR_OK(ads_clear_service_principal_names(ads, global_myname()))) {
 386                 DEBUG(1,("ads_keytab_flush: Error while clearing service principal listings in LDAP.\n"));
 387                 goto out;
 388         }
 389
 390 out:
 391
 392         {
 393                 krb5_keytab_entry zero_kt_entry;
 394                 ZERO_STRUCT(zero_kt_entry);
 395                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 396                         smb_krb5_kt_free_entry(context, &kt_entry);
 397                 }
 398         }
 399         {
 400                 krb5_kt_cursor zero_csr;
 401                 ZERO_STRUCT(zero_csr);
 402                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 403                         krb5_kt_end_seq_get(context, keytab, &cursor);
 404                 }
 405         }
 406         if (keytab) {
 407                 krb5_kt_close(context, keytab);
 408         }
 409         if (context) {
 410                 krb5_free_context(context);
 411         }
 412         return ret;
 413 }
 414
 415 /**********************************************************************
 416  Adds all the required service principals to the system keytab.
 417 ***********************************************************************/
 418
 419 int ads_keytab_create_default(ADS_STRUCT *ads)
 420 {
 421         krb5_error_code ret = 0;
 422         krb5_context context = NULL;
 423         krb5_keytab keytab = NULL;
 424         krb5_kt_cursor cursor;
 425         krb5_keytab_entry kt_entry;
 426         krb5_kvno kvno;
 427         fstring my_fqdn, my_Fqdn, my_name, my_NAME;
 428         int i, found = 0;
 429         char **oldEntries = NULL, *princ_s[18];;
 430
 431         ret = ads_keytab_add_entry(ads, "host");
 432         if (ret) {
 433                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding 'host'.\n"));
 434                 return ret;
 435         }
 436         ret = ads_keytab_add_entry(ads, "cifs");
 437         if (ret) {
 438                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding 'cifs'.\n"));
 439                 return ret;
 440         }
 441
 442         fstrcpy(my_name, global_myname());
 443         strlower_m(my_name);
 444         fstrcpy(my_NAME, global_myname());
 445         strupper_m(my_NAME);
 446         name_to_fqdn(my_Fqdn, global_myname());
 447         strlower_m(my_Fqdn);
 448         memcpy(my_Fqdn, my_NAME, strlen(my_NAME));
 449         name_to_fqdn(my_fqdn, global_myname());
 450         strlower_m(my_fqdn);
 451
 452         asprintf(&princ_s[0], "%s$@%s", my_name, lp_realm());
 453         asprintf(&princ_s[1], "%s$@%s", my_NAME, lp_realm());
 454         asprintf(&princ_s[2], "host/%s@%s", my_name, lp_realm());
 455         asprintf(&princ_s[3], "host/%s@%s", my_NAME, lp_realm());
 456         asprintf(&princ_s[4], "host/%s@%s", my_fqdn, lp_realm());
 457         asprintf(&princ_s[5], "host/%s@%s", my_Fqdn, lp_realm());
 458         asprintf(&princ_s[6], "HOST/%s@%s", my_name, lp_realm());
 459         asprintf(&princ_s[7], "HOST/%s@%s", my_NAME, lp_realm());
 460         asprintf(&princ_s[8], "HOST/%s@%s", my_fqdn, lp_realm());
 461         asprintf(&princ_s[9], "HOST/%s@%s", my_Fqdn, lp_realm());
 462         asprintf(&princ_s[10], "cifs/%s@%s", my_name, lp_realm());
 463         asprintf(&princ_s[11], "cifs/%s@%s", my_NAME, lp_realm());
 464         asprintf(&princ_s[12], "cifs/%s@%s", my_fqdn, lp_realm());
 465         asprintf(&princ_s[13], "cifs/%s@%s", my_Fqdn, lp_realm());
 466         asprintf(&princ_s[14], "CIFS/%s@%s", my_name, lp_realm());
 467         asprintf(&princ_s[15], "CIFS/%s@%s", my_NAME, lp_realm());
 468         asprintf(&princ_s[16], "CIFS/%s@%s", my_fqdn, lp_realm());
 469         asprintf(&princ_s[17], "CIFS/%s@%s", my_Fqdn, lp_realm());
 470
 471         for (i = 0; i < sizeof(princ_s) / sizeof(princ_s[0]); i++) {
 472                 if (princ_s[i] != NULL) {
 473                         ret = ads_keytab_add_entry(ads, princ_s[i]);
 474                         if (ret != 0) {
 475                                 DEBUG(1,("ads_keytab_create_default: ads_keytab_add_entry failed while adding '%s'.\n", princ_s[i]));
 476                         }
 477                         SAFE_FREE(princ_s[i]);
 478                 }
 479         }
 480
 481         kvno = (krb5_kvno) ads_get_kvno(ads, global_myname());
 482         if (kvno == -1) {
 483                 DEBUG(1,("ads_keytab_create_default: ads_get_kvno failed to determine the system's kvno.\n"));
 484                 return -1;
 485         }
 486
 487         DEBUG(3,("ads_keytab_create_default: Searching for keytab entries to preserve and update.\n"));
 488         /* Now loop through the keytab and update any other existing entries... */
 489
 490         ZERO_STRUCT(kt_entry);
 491         ZERO_STRUCT(cursor);
 492
 493         initialize_krb5_error_table();
 494         ret = krb5_init_context(&context);
 495         if (ret) {
 496                 DEBUG(1,("ads_keytab_create_default: could not krb5_init_context: %s\n",error_message(ret)));
 497                 return ret;
 498         }
 499         ret = krb5_kt_default(context, &keytab);
 500         if (ret) {
 501                 DEBUG(1,("ads_keytab_create_default: krb5_kt_default failed (%s)\n",error_message(ret)));
 502                 goto done;
 503         }
 504
 505         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 506         if (ret != KRB5_KT_END && ret != ENOENT ) {
 507                 while ((ret = krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) == 0) {
 508                         smb_krb5_kt_free_entry(context, &kt_entry);
 509                         ZERO_STRUCT(kt_entry);
 510                         found++;
 511                 }
 512         }
 513         krb5_kt_end_seq_get(context, keytab, &cursor);
 514         ZERO_STRUCT(cursor);
 515
 516         /*
 517          * Hmmm. There is no "rewind" function for the keytab. This means we have a race condition
 518          * where someone else could add entries after we've counted them. Re-open asap to minimise
 519          * the race. JRA.
 520          */
 521
 522         DEBUG(3, ("ads_keytab_create_default: Found %d entries in the keytab.\n", found));
 523         if (!found) {
 524                 goto done;
 525         }
 526         oldEntries = (char **) malloc(found * sizeof(char *));
 527         if (!oldEntries) {
 528                 DEBUG(1,("ads_keytab_create_default: Failed to allocate space to store the old keytab entries (malloc failed?).\n"));
 529                 ret = -1;
 530                 goto done;
 531         }
 532         memset(oldEntries, '\0', found * sizeof(char *));
 533
 534         ret = krb5_kt_start_seq_get(context, keytab, &cursor);
 535         if (ret != KRB5_KT_END && ret != ENOENT ) {
 536                 while (krb5_kt_next_entry(context, keytab, &kt_entry, &cursor) == 0) {
 537                         if (kt_entry.vno != kvno) {
 538                                 char *ktprinc = NULL;
 539                                 char *p;
 540
 541                                 /* This returns a malloc'ed string in ktprinc. */
 542                                 ret = krb5_unparse_name(context, kt_entry.principal, &ktprinc);
 543                                 if (ret) {
 544                                         DEBUG(1,("krb5_unparse_name failed (%s)\n", error_message(ret)));
 545                                         goto done;
 546                                 }
 547                                 /*
 548                                  * From looking at the krb5 source they don't seem to take locale
 549                                  * or mb strings into account. Maybe this is because they assume utf8 ?
 550                                  * In this case we may need to convert from utf8 to mb charset here ? JRA.
 551                                  */
 552                                 p = strchr_m(ktprinc, '@');
 553                                 if (p) {
 554                                         *p = '\0';
 555                                 }
 556
 557                                 p = strchr_m(ktprinc, '/');
 558                                 if (p) {
 559                                         *p = '\0';
 560                                 }
 561                                 for (i = 0; i < found; i++) {
 562                                         if (!oldEntries[i]) {
 563                                                 oldEntries[i] = ktprinc;
 564                                                 break;
 565                                         }
 566                                         if (!strcmp(oldEntries[i], ktprinc)) {
 567                                                 krb5_free_unparsed_name(context, ktprinc);
 568                                                 break;
 569                                         }
 570                                 }
 571                                 if (i == found) {
 572                                         krb5_free_unparsed_name(context, ktprinc);
 573                                 }
 574                         }
 575                         smb_krb5_kt_free_entry(context, &kt_entry);
 576                         ZERO_STRUCT(kt_entry);
 577                 }
 578                 ret = 0;
 579                 for (i = 0; oldEntries[i]; i++) {
 580                         ret |= ads_keytab_add_entry(ads, oldEntries[i]);
 581                         krb5_free_unparsed_name(context, oldEntries[i]);
 582                 }
 583                 krb5_kt_end_seq_get(context, keytab, &cursor);
 584         }
 585         ZERO_STRUCT(cursor);
 586
 587 done:
 588
 589         SAFE_FREE(oldEntries);
 590
 591         {
 592                 krb5_keytab_entry zero_kt_entry;
 593                 ZERO_STRUCT(zero_kt_entry);
 594                 if (memcmp(&zero_kt_entry, &kt_entry, sizeof(krb5_keytab_entry))) {
 595                         smb_krb5_kt_free_entry(context, &kt_entry);
 596                 }
 597         }
 598         {
 599                 krb5_kt_cursor zero_csr;
 600                 ZERO_STRUCT(zero_csr);
 601                 if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
 602                         krb5_kt_end_seq_get(context, keytab, &cursor);
 603                 }
 604         }
 605         if (keytab) {
 606                 krb5_kt_close(context, keytab);
 607         }
 608         if (context) {
 609                 krb5_free_context(context);
 610         }
 611         return ret;
 612 }
 613 #endif /* HAVE_KRB5 */