source3/libads/kerberos.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    kerberos utility library
   4    Copyright (C) Andrew Tridgell 2001
   5    Copyright (C) Remus Koos 2001
   6    Copyright (C) Nalin Dahyabhai <nalin@redhat.com> 2004.
   7    Copyright (C) Jeremy Allison 2004.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25
  26 #ifdef HAVE_KRB5
  27
  28 #define LIBADS_CCACHE_NAME "MEMORY:libads"
  29
  30 /*
  31   we use a prompter to avoid a crash bug in the kerberos libs when
  32   dealing with empty passwords
  33   this prompter is just a string copy ...
  34 */
  35 static krb5_error_code
  36 kerb_prompter(krb5_context ctx, void *data,
  37                const char *name,
  38                const char *banner,
  39                int num_prompts,
  40                krb5_prompt prompts[])
  41 {
  42         if (num_prompts == 0) return 0;
  43
  44         memset(prompts[0].reply->data, '\0', prompts[0].reply->length);
  45         if (prompts[0].reply->length > 0) {
  46                 if (data) {
  47                         strncpy(prompts[0].reply->data, data, prompts[0].reply->length-1);
  48                         prompts[0].reply->length = strlen(prompts[0].reply->data);
  49                 } else {
  50                         prompts[0].reply->length = 0;
  51                 }
  52         }
  53         return 0;
  54 }
  55
  56 /*
  57   simulate a kinit, putting the tgt in the given cache location. If cache_name == NULL
  58   place in default cache location.
  59   remus@snapserver.com
  60 */
  61 int kerberos_kinit_password(const char *principal,
  62                                 const char *password,
  63                                 int time_offset,
  64                                 time_t *expire_time,
  65                                 const char *cache_name)
  66 {
  67         krb5_context ctx = NULL;
  68         krb5_error_code code = 0;
  69         krb5_ccache cc = NULL;
  70         krb5_principal me;
  71         krb5_creds my_creds;
  72
  73         if ((code = krb5_init_context(&ctx)))
  74                 return code;
  75
  76         if (time_offset != 0) {
  77                 krb5_set_real_time(ctx, time(NULL) + time_offset, 0);
  78         }
  79
  80         if ((code = krb5_cc_resolve(ctx, cache_name ?
  81                         cache_name : krb5_cc_default_name(ctx), &cc))) {
  82                 krb5_free_context(ctx);
  83                 return code;
  84         }
  85
  86         if ((code = krb5_parse_name(ctx, principal, &me))) {
  87                 krb5_free_context(ctx);
  88                 return code;
  89         }
  90
  91         if ((code = krb5_get_init_creds_password(ctx, &my_creds, me,
  92                                                  CONST_DISCARD(char *, password),
  93                                                  kerb_prompter,
  94                                                  NULL, 0, NULL, NULL))) {
  95                 krb5_free_principal(ctx, me);
  96                 krb5_free_context(ctx);
  97                 return code;
  98         }
  99
 100         if ((code = krb5_cc_initialize(ctx, cc, me))) {
 101                 krb5_free_cred_contents(ctx, &my_creds);
 102                 krb5_free_principal(ctx, me);
 103                 krb5_free_context(ctx);
 104                 return code;
 105         }
 106
 107         if ((code = krb5_cc_store_cred(ctx, cc, &my_creds))) {
 108                 krb5_cc_close(ctx, cc);
 109                 krb5_free_cred_contents(ctx, &my_creds);
 110                 krb5_free_principal(ctx, me);
 111                 krb5_free_context(ctx);
 112                 return code;
 113         }
 114
 115         if (expire_time)
 116                 *expire_time = (time_t) my_creds.times.endtime;
 117
 118         krb5_cc_close(ctx, cc);
 119         krb5_free_cred_contents(ctx, &my_creds);
 120         krb5_free_principal(ctx, me);
 121         krb5_free_context(ctx);
 122
 123         return 0;
 124 }
 125
 126
 127
 128 /* run kinit to setup our ccache */
 129 int ads_kinit_password(ADS_STRUCT *ads)
 130 {
 131         char *s;
 132         int ret;
 133
 134         if (asprintf(&s, "%s@%s", ads->auth.user_name, ads->auth.realm) == -1) {
 135                 return KRB5_CC_NOMEM;
 136         }
 137
 138         if (!ads->auth.password) {
 139                 return KRB5_LIBOS_CANTREADPWD;
 140         }
 141
 142         ret = kerberos_kinit_password(s, ads->auth.password, ads->auth.time_offset,
 143                         &ads->auth.expire, NULL);
 144
 145         if (ret) {
 146                 DEBUG(0,("kerberos_kinit_password %s failed: %s\n",
 147                          s, error_message(ret)));
 148         }
 149         free(s);
 150         return ret;
 151 }
 152
 153 int ads_kdestroy(const char *cc_name)
 154 {
 155         krb5_error_code code;
 156         krb5_context ctx = NULL;
 157         krb5_ccache cc = NULL;
 158
 159         if ((code = krb5_init_context (&ctx))) {
 160                 DEBUG(3, ("ads_kdestroy: kdb5_init_context failed: %s\n",
 161                         error_message(code)));
 162                 return code;
 163         }
 164
 165         if (!cc_name) {
 166                 if ((code = krb5_cc_default(ctx, &cc))) {
 167                         krb5_free_context(ctx);
 168                         return code;
 169                 }
 170         } else {
 171                 if ((code = krb5_cc_resolve(ctx, cc_name, &cc))) {
 172                         DEBUG(3, ("ads_kdestroy: krb5_cc_resolve failed: %s\n",
 173                                   error_message(code)));
 174                         krb5_free_context(ctx);
 175                         return code;
 176                 }
 177         }
 178
 179         if ((code = krb5_cc_destroy (ctx, cc))) {
 180                 DEBUG(3, ("ads_kdestroy: krb5_cc_destroy failed: %s\n",
 181                         error_message(code)));
 182         }
 183
 184         krb5_free_context (ctx);
 185         return code;
 186 }
 187
 188 /************************************************************************
 189  Routine to fetch the salting principal for a service.  Active
 190  Directory may use a non-obvious principal name to generate the salt
 191  when it determines the key to use for encrypting tickets for a service,
 192  and hopefully we detected that when we joined the domain.
 193  ************************************************************************/
 194
 195 static char *kerberos_secrets_fetch_salting_principal(const char *service, int enctype)
 196 {
 197         char *key = NULL;
 198         char *ret = NULL;
 199
 200         asprintf(&key, "%s/%s/enctype=%d", SECRETS_SALTING_PRINCIPAL, service, enctype);
 201         if (!key) {
 202                 return NULL;
 203         }
 204         ret = (char *)secrets_fetch(key, NULL);
 205         SAFE_FREE(key);
 206         return ret;
 207 }
 208
 209 /************************************************************************
 210  Routine to get the salting principal for this service.  Active
 211  Directory may use a non-obvious principal name to generate the salt
 212  when it determines the key to use for encrypting tickets for a service,
 213  and hopefully we detected that when we joined the domain.
 214  Caller must free if return is not null.
 215  ************************************************************************/
 216
 217 krb5_principal kerberos_fetch_salt_princ_for_host_princ(krb5_context context,
 218                                                         krb5_principal host_princ,
 219                                                         int enctype)
 220 {
 221         char *unparsed_name = NULL, *salt_princ_s = NULL;
 222         krb5_principal ret_princ = NULL;
 223
 224         if (krb5_unparse_name(context, host_princ, &unparsed_name) != 0) {
 225                 return (krb5_principal)NULL;
 226         }
 227
 228         if ((salt_princ_s = kerberos_secrets_fetch_salting_principal(unparsed_name, enctype)) == NULL) {
 229                 krb5_free_unparsed_name(context, unparsed_name);
 230                 return (krb5_principal)NULL;
 231         }
 232
 233         if (krb5_parse_name(context, salt_princ_s, &ret_princ) != 0) {
 234                 krb5_free_unparsed_name(context, unparsed_name);
 235                 SAFE_FREE(salt_princ_s);
 236                 return (krb5_principal)NULL;
 237         }
 238         krb5_free_unparsed_name(context, unparsed_name);
 239         SAFE_FREE(salt_princ_s);
 240         return ret_princ;
 241 }
 242
 243 /************************************************************************
 244  Routine to set the salting principal for this service.  Active
 245  Directory may use a non-obvious principal name to generate the salt
 246  when it determines the key to use for encrypting tickets for a service,
 247  and hopefully we detected that when we joined the domain.
 248  Setting principal to NULL deletes this entry.
 249  ************************************************************************/
 250
 251  BOOL kerberos_secrets_store_salting_principal(const char *service,
 252                                               int enctype,
 253                                               const char *principal)
 254 {
 255         char *key = NULL;
 256         BOOL ret = False;
 257         krb5_context context = NULL;
 258         krb5_principal princ = NULL;
 259         char *princ_s = NULL;
 260         char *unparsed_name = NULL;
 261
 262         krb5_init_context(&context);
 263         if (!context) {
 264                 return False;
 265         }
 266         if (strchr_m(service, '@')) {
 267                 asprintf(&princ_s, "%s", service);
 268         } else {
 269                 asprintf(&princ_s, "%s@%s", service, lp_realm());
 270         }
 271
 272         if (krb5_parse_name(context, princ_s, &princ) != 0) {
 273                 goto out;
 274
 275         }
 276         if (krb5_unparse_name(context, princ, &unparsed_name) != 0) {
 277                 goto out;
 278         }
 279
 280         asprintf(&key, "%s/%s/enctype=%d", SECRETS_SALTING_PRINCIPAL, unparsed_name, enctype);
 281         if (!key)  {
 282                 goto out;
 283         }
 284
 285         if ((principal != NULL) && (strlen(principal) > 0)) {
 286                 ret = secrets_store(key, principal, strlen(principal) + 1);
 287         } else {
 288                 ret = secrets_delete(key);
 289         }
 290
 291  out:
 292
 293         SAFE_FREE(key);
 294         SAFE_FREE(princ_s);
 295
 296         if (unparsed_name) {
 297                 krb5_free_unparsed_name(context, unparsed_name);
 298         }
 299         if (context) {
 300                 krb5_free_context(context);
 301         }
 302
 303         return ret;
 304 }
 305
 306 /************************************************************************
 307  Routine to get initial credentials as a service ticket for the local machine.
 308  Returns a buffer initialized with krb5_mk_req_extended.
 309  ************************************************************************/
 310
 311 static krb5_error_code get_service_ticket(krb5_context ctx,
 312                                         krb5_ccache ccache,
 313                                         const char *service_principal,
 314                                         int enctype,
 315                                         krb5_data *p_outbuf)
 316 {
 317         krb5_creds creds, *new_creds = NULL;
 318         char *service_s = NULL;
 319         char *machine_account = NULL, *password = NULL;
 320         krb5_data in_data;
 321         krb5_auth_context auth_context = NULL;
 322         krb5_error_code err = 0;
 323
 324         ZERO_STRUCT(creds);
 325
 326         asprintf(&machine_account, "%s$@%s", global_myname(), lp_realm());
 327         if (machine_account == NULL) {
 328                 goto out;
 329         }
 330         password = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
 331         if (password == NULL) {
 332                 goto out;
 333         }
 334         if ((err = kerberos_kinit_password(machine_account, password, 0, NULL, LIBADS_CCACHE_NAME)) != 0) {
 335                 DEBUG(0,("get_service_ticket: kerberos_kinit_password %s@%s failed: %s\n",
 336                         machine_account,
 337                         lp_realm(),
 338                         error_message(err)));
 339                 goto out;
 340         }
 341
 342         /* Ok - the above call has gotten a TGT. Now we need to get a service
 343            ticket to ourselves. */
 344
 345         /* Set up the enctype and client and server principal fields for krb5_get_credentials. */
 346         kerberos_set_creds_enctype(&creds, enctype);
 347
 348         if ((err = krb5_cc_get_principal(ctx, ccache, &creds.client))) {
 349                 DEBUG(3, ("get_service_ticket: krb5_cc_get_principal failed: %s\n",
 350                         error_message(err)));
 351                 goto out;
 352         }
 353
 354         if (strchr_m(service_principal, '@')) {
 355                 asprintf(&service_s, "%s", service_principal);
 356         } else {
 357                 asprintf(&service_s, "%s@%s", service_principal, lp_realm());
 358         }
 359
 360         if ((err = krb5_parse_name(ctx, service_s, &creds.server))) {
 361                 DEBUG(0,("get_service_ticket: krb5_parse_name %s failed: %s\n",
 362                         service_s, error_message(err)));
 363                 goto out;
 364         }
 365
 366         if ((err = krb5_get_credentials(ctx, 0, ccache, &creds, &new_creds))) {
 367                 DEBUG(5,("get_service_ticket: krb5_get_credentials for %s enctype %d failed: %s\n",
 368                         service_s, enctype, error_message(err)));
 369                 goto out;
 370         }
 371
 372         memset(&in_data, '\0', sizeof(in_data));
 373         if ((err = krb5_mk_req_extended(ctx, &auth_context, 0, &in_data,
 374                         new_creds, p_outbuf)) != 0) {
 375                 DEBUG(0,("get_service_ticket: krb5_mk_req_extended failed: %s\n",
 376                         error_message(err)));
 377                 goto out;
 378         }
 379
 380  out:
 381
 382         if (auth_context) {
 383                 krb5_auth_con_free(ctx, auth_context);
 384         }
 385         if (new_creds) {
 386                 krb5_free_creds(ctx, new_creds);
 387         }
 388         if (creds.server) {
 389                 krb5_free_principal(ctx, creds.server);
 390         }
 391         if (creds.client) {
 392                 krb5_free_principal(ctx, creds.client);
 393         }
 394
 395         SAFE_FREE(service_s);
 396         SAFE_FREE(password);
 397         SAFE_FREE(machine_account);
 398         return err;
 399 }
 400
 401 /************************************************************************
 402  Check if the machine password can be used in conjunction with the salting_principal
 403  to generate a key which will successfully decrypt the AP_REQ already
 404  gotten as a message to the local machine.
 405  ************************************************************************/
 406
 407 static BOOL verify_service_password(krb5_context ctx,
 408                                     int enctype,
 409                                     const char *salting_principal,
 410                                     krb5_data *in_data)
 411 {
 412         BOOL ret = False;
 413         krb5_principal salting_kprinc = NULL;
 414         krb5_ticket *ticket = NULL;
 415         krb5_keyblock key;
 416         krb5_data passdata;
 417         char *salting_s = NULL;
 418         char *machine_account = NULL, *password = NULL;
 419         krb5_auth_context auth_context = NULL;
 420         krb5_error_code err;
 421
 422         memset(&passdata, '\0', sizeof(passdata));
 423         memset(&key, '\0', sizeof(key));
 424
 425         asprintf(&machine_account, "%s$@%s", global_myname(), lp_realm());
 426         if (machine_account == NULL) {
 427                 goto out;
 428         }
 429         password = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
 430         if (password == NULL) {
 431                 goto out;
 432         }
 433
 434         if (strchr_m(salting_principal, '@')) {
 435                 asprintf(&salting_s, "%s", salting_principal);
 436         } else {
 437                 asprintf(&salting_s, "%s@%s", salting_principal, lp_realm());
 438         }
 439
 440         if ((err = krb5_parse_name(ctx, salting_s, &salting_kprinc))) {
 441                 DEBUG(0,("verify_service_password: krb5_parse_name %s failed: %s\n",
 442                         salting_s, error_message(err)));
 443                 goto out;
 444         }
 445
 446         passdata.length = strlen(password);
 447         passdata.data = (char*)password;
 448         if ((err = create_kerberos_key_from_string_direct(ctx, salting_kprinc, &passdata, &key, enctype))) {
 449                 DEBUG(0,("verify_service_password: create_kerberos_key_from_string %d failed: %s\n",
 450                         enctype, error_message(err)));
 451                 goto out;
 452         }
 453
 454         if ((err = krb5_auth_con_init(ctx, &auth_context)) != 0) {
 455                 DEBUG(0,("verify_service_password: krb5_auth_con_init failed %s\n", error_message(err)));
 456                 goto out;
 457         }
 458
 459         if ((err = krb5_auth_con_setuseruserkey(ctx, auth_context, &key)) != 0) {
 460                 DEBUG(0,("verify_service_password: krb5_auth_con_setuseruserkey failed %s\n", error_message(err)));
 461                 goto out;
 462         }
 463
 464         if (!(err = krb5_rd_req(ctx, &auth_context, in_data, NULL, NULL, NULL, &ticket))) {
 465                 DEBUG(10,("verify_service_password: decrypted message with enctype %u salt %s!\n",
 466                                 (unsigned int)enctype, salting_s));
 467                 ret = True;
 468         }
 469
 470  out:
 471
 472         memset(&passdata, 0, sizeof(passdata));
 473         krb5_free_keyblock_contents(ctx, &key);
 474         if (ticket != NULL) {
 475                 krb5_free_ticket(ctx, ticket);
 476         }
 477         if (salting_kprinc) {
 478                 krb5_free_principal(ctx, salting_kprinc);
 479         }
 480         SAFE_FREE(salting_s);
 481         SAFE_FREE(password);
 482         SAFE_FREE(machine_account);
 483         return ret;
 484 }
 485
 486 /************************************************************************
 487  *
 488  * From the current draft of kerberos-clarifications:
 489  *
 490  *     It is not possible to reliably generate a user's key given a pass
 491  *     phrase without contacting the KDC, since it will not be known
 492  *     whether alternate salt or parameter values are required.
 493  *
 494  * And because our server has a password, we have this exact problem.  We
 495  * make multiple guesses as to which principal name provides the salt which
 496  * the KDC is using.
 497  *
 498  ************************************************************************/
 499
 500 static void kerberos_derive_salting_principal_for_enctype(const char *service_principal,
 501                                                           krb5_context ctx,
 502                                                           krb5_ccache ccache,
 503                                                           krb5_enctype enctype,
 504                                                           krb5_enctype *enctypes)
 505 {
 506         char *salting_principals[3] = {NULL, NULL, NULL}, *second_principal = NULL;
 507         krb5_error_code err = 0;
 508         krb5_data outbuf;
 509         int i, j;
 510
 511         memset(&outbuf, '\0', sizeof(outbuf));
 512
 513         /* Check that the service_principal is useful. */
 514         if ((service_principal == NULL) || (strlen(service_principal) == 0)) {
 515                 return;
 516         }
 517
 518         /* Generate our first guess -- the principal as-given. */
 519         asprintf(&salting_principals[0], "%s", service_principal);
 520         if ((salting_principals[0] == NULL) || (strlen(salting_principals[0]) == 0)) {
 521                 return;
 522         }
 523
 524         /* Generate our second guess -- the computer's principal, as Win2k3. */
 525         asprintf(&second_principal, "host/%s.%s", global_myname(), lp_realm());
 526         if (second_principal != NULL) {
 527                 strlower_m(second_principal);
 528                 asprintf(&salting_principals[1], "%s@%s", second_principal, lp_realm());
 529                 SAFE_FREE(second_principal);
 530         }
 531         if ((salting_principals[1] == NULL) || (strlen(salting_principals[1]) == 0)) {
 532                 goto out;
 533         }
 534
 535         /* Generate our third guess -- the computer's principal, as Win2k. */
 536         asprintf(&second_principal, "HOST/%s", global_myname());
 537         if (second_principal != NULL) {
 538                 strlower_m(second_principal + 5);
 539                 asprintf(&salting_principals[2], "%s@%s",
 540                         second_principal, lp_realm());
 541                 SAFE_FREE(second_principal);
 542         }
 543         if ((salting_principals[2] == NULL) || (strlen(salting_principals[2]) == 0)) {
 544                 goto out;
 545         }
 546
 547         /* Get a service ticket for ourselves into our memory ccache. */
 548         /* This will commonly fail if there is no principal by that name (and we're trying
 549            many names). So don't print a debug 0 error. */
 550
 551         if ((err = get_service_ticket(ctx, ccache, service_principal, enctype, &outbuf)) != 0) {
 552                 DEBUG(3, ("verify_service_password: get_service_ticket failed: %s\n",
 553                         error_message(err)));
 554                 goto out;
 555         }
 556
 557         /* At this point we have a message to ourselves, salted only the KDC knows how. We
 558            have to work out what that salting is. */
 559
 560         /* Try and find the correct salting principal. */
 561         for (i = 0; i < sizeof(salting_principals) / sizeof(salting_principals[i]); i++) {
 562                 if (verify_service_password(ctx, enctype, salting_principals[i], &outbuf)) {
 563                         break;
 564                 }
 565         }
 566
 567         /* If we failed to get a match, return. */
 568         if (i >= sizeof(salting_principals) / sizeof(salting_principals[i])) {
 569                 goto out;
 570         }
 571
 572         /* If we succeeded, store the principal for use for all enctypes which
 573          * share the same cipher and string-to-key function.  Doing this here
 574          * allows servers which just pass a keytab to krb5_rd_req() to work
 575          * correctly. */
 576         for (j = 0; enctypes[j] != 0; j++) {
 577                 if (enctype != enctypes[j]) {
 578                         /* If this enctype isn't compatible with the one which
 579                          * we used, skip it. */
 580
 581                         if (!kerberos_compatible_enctypes(ctx, enctypes[j], enctype))
 582                                 continue;
 583                 }
 584                 /* If the principal which gives us the proper salt is the one
 585                  * which we would normally guess, don't bother noting anything
 586                  * in the secrets tdb. */
 587                 if (strcmp(service_principal, salting_principals[i]) != 0) {
 588                         kerberos_secrets_store_salting_principal(service_principal,
 589                                                                 enctypes[j],
 590                                                                 salting_principals[i]);
 591                 }
 592         }
 593
 594  out :
 595
 596         kerberos_free_data_contents(ctx, &outbuf);
 597         SAFE_FREE(salting_principals[0]);
 598         SAFE_FREE(salting_principals[1]);
 599         SAFE_FREE(salting_principals[2]);
 600         SAFE_FREE(second_principal);
 601 }
 602
 603 /************************************************************************
 604  Go through all the possible enctypes for this principal.
 605  ************************************************************************/
 606
 607 static void kerberos_derive_salting_principal_direct(krb5_context context,
 608                                         krb5_ccache ccache,
 609                                         krb5_enctype *enctypes,
 610                                         char *service_principal)
 611 {
 612         int i;
 613
 614         /* Try for each enctype separately, because the rules are
 615          * different for different enctypes. */
 616         for (i = 0; enctypes[i] != 0; i++) {
 617                 /* Delete secrets entry first. */
 618                 kerberos_secrets_store_salting_principal(service_principal, 0, NULL);
 619 #ifdef ENCTYPE_ARCFOUR_HMAC
 620                 if (enctypes[i] == ENCTYPE_ARCFOUR_HMAC) {
 621                         /* Of course this'll always work, so just save
 622                          * ourselves the effort. */
 623                         continue;
 624                 }
 625 #endif
 626                 /* Try to figure out what's going on with this
 627                  * principal. */
 628                 kerberos_derive_salting_principal_for_enctype(service_principal,
 629                                                                 context,
 630                                                                 ccache,
 631                                                                 enctypes[i],
 632                                                                 enctypes);
 633         }
 634 }
 635
 636 /************************************************************************
 637  Wrapper function for the above.
 638  ************************************************************************/
 639
 640 BOOL kerberos_derive_salting_principal(char *service_principal)
 641 {
 642         krb5_context context = NULL;
 643         krb5_enctype *enctypes = NULL;
 644         krb5_ccache ccache = NULL;
 645         krb5_error_code ret = 0;
 646
 647         initialize_krb5_error_table();
 648         if ((ret = krb5_init_context(&context)) != 0) {
 649                 DEBUG(1,("kerberos_derive_cifs_salting_principals: krb5_init_context failed. %s\n",
 650                         error_message(ret)));
 651                 return False;
 652         }
 653         if ((ret = get_kerberos_allowed_etypes(context, &enctypes)) != 0) {
 654                 DEBUG(1,("kerberos_derive_cifs_salting_principals: get_kerberos_allowed_etypes failed. %s\n",
 655                         error_message(ret)));
 656                 goto out;
 657         }
 658
 659         if ((ret = krb5_cc_resolve(context, LIBADS_CCACHE_NAME, &ccache)) != 0) {
 660                 DEBUG(3, ("get_service_ticket: krb5_cc_resolve for %s failed: %s\n",
 661                         LIBADS_CCACHE_NAME, error_message(ret)));
 662                 goto out;
 663         }
 664
 665         kerberos_derive_salting_principal_direct(context, ccache, enctypes, service_principal);
 666
 667   out:
 668         if (enctypes) {
 669                 free_kerberos_etypes(context, enctypes);
 670         }
 671         if (ccache) {
 672                 krb5_cc_destroy(context, ccache);
 673         }
 674         if (context) {
 675                 krb5_free_context(context);
 676         }
 677
 678         return ret ? False : True;
 679 }
 680
 681 /************************************************************************
 682  Core function to try and determine what salt is being used for any keytab
 683  keys.
 684  ************************************************************************/
 685
 686 BOOL kerberos_derive_cifs_salting_principals(void)
 687 {
 688         fstring my_fqdn;
 689         char *service = NULL;
 690         krb5_context context = NULL;
 691         krb5_enctype *enctypes = NULL;
 692         krb5_ccache ccache = NULL;
 693         krb5_error_code ret = 0;
 694         BOOL retval = False;
 695
 696         initialize_krb5_error_table();
 697         if ((ret = krb5_init_context(&context)) != 0) {
 698                 DEBUG(1,("kerberos_derive_cifs_salting_principals: krb5_init_context failed. %s\n",
 699                         error_message(ret)));
 700                 return False;
 701         }
 702         if ((ret = get_kerberos_allowed_etypes(context, &enctypes)) != 0) {
 703                 DEBUG(1,("kerberos_derive_cifs_salting_principals: get_kerberos_allowed_etypes failed. %s\n",
 704                         error_message(ret)));
 705                 goto out;
 706         }
 707
 708         if ((ret = krb5_cc_resolve(context, LIBADS_CCACHE_NAME, &ccache)) != 0) {
 709                 DEBUG(3, ("get_service_ticket: krb5_cc_resolve for %s failed: %s\n",
 710                         LIBADS_CCACHE_NAME, error_message(ret)));
 711                 goto out;
 712         }
 713
 714         if (asprintf(&service, "%s$", global_myname()) != -1) {
 715                 strlower_m(service);
 716                 kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
 717                 SAFE_FREE(service);
 718         }
 719         if (asprintf(&service, "cifs/%s", global_myname()) != -1) {
 720                 strlower_m(service);
 721                 kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
 722                 SAFE_FREE(service);
 723         }
 724         if (asprintf(&service, "host/%s", global_myname()) != -1) {
 725                 strlower_m(service);
 726                 kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
 727                 SAFE_FREE(service);
 728         }
 729         if (asprintf(&service, "cifs/%s.%s", global_myname(), lp_realm()) != -1) {
 730                 strlower_m(service);
 731                 kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
 732                 SAFE_FREE(service);
 733         }
 734         if (asprintf(&service, "host/%s.%s", global_myname(), lp_realm()) != -1) {
 735                 strlower_m(service);
 736                 kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
 737                 SAFE_FREE(service);
 738         }
 739         name_to_fqdn(my_fqdn, global_myname());
 740         if (asprintf(&service, "cifs/%s", my_fqdn) != -1) {
 741                 strlower_m(service);
 742                 kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
 743                 SAFE_FREE(service);
 744         }
 745         if (asprintf(&service, "host/%s", my_fqdn) != -1) {
 746                 strlower_m(service);
 747                 kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
 748                 SAFE_FREE(service);
 749         }
 750
 751         retval = True;
 752
 753   out:
 754         if (enctypes) {
 755                 free_kerberos_etypes(context, enctypes);
 756         }
 757         if (ccache) {
 758                 krb5_cc_destroy(context, ccache);
 759         }
 760         if (context) {
 761                 krb5_free_context(context);
 762         }
 763         return retval;
 764 }
 765 #endif