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                                 time_t *renew_till_time,
  66                                 const char *cache_name,
  67                                 BOOL request_pac,
  68                                 time_t renewable_time)
  69 {
  70         krb5_context ctx = NULL;
  71         krb5_error_code code = 0;
  72         krb5_ccache cc = NULL;
  73         krb5_principal me;
  74         krb5_creds my_creds;
  75         krb5_get_init_creds_opt opt;
  76
  77         initialize_krb5_error_table();
  78         if ((code = krb5_init_context(&ctx)))
  79                 return code;
  80
  81         if (time_offset != 0) {
  82                 krb5_set_real_time(ctx, time(NULL) + time_offset, 0);
  83         }
  84
  85         DEBUG(10,("kerberos_kinit_password: using %s as ccache\n",
  86                         cache_name ? cache_name: krb5_cc_default_name(ctx)));
  87
  88         if ((code = krb5_cc_resolve(ctx, cache_name ? cache_name : krb5_cc_default_name(ctx), &cc))) {
  89                 krb5_free_context(ctx);
  90                 return code;
  91         }
  92
  93         if ((code = krb5_parse_name(ctx, principal, &me))) {
  94                 krb5_free_context(ctx);
  95                 return code;
  96         }
  97
  98         krb5_get_init_creds_opt_init(&opt);
  99         krb5_get_init_creds_opt_set_renew_life(&opt, renewable_time);
 100         krb5_get_init_creds_opt_set_forwardable(&opt, 1);
 101
 102         if (request_pac) {
 103 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_SET_PAC_REQUEST
 104                 krb5_get_init_creds_opt_set_pac_request(ctx, &opt, True);
 105 #endif
 106         }
 107
 108         if ((code = krb5_get_init_creds_password(ctx, &my_creds, me, CONST_DISCARD(char *,password),
 109                                                  kerb_prompter,
 110                                                  NULL, 0, NULL, &opt))) {
 111                 krb5_free_principal(ctx, me);
 112                 krb5_free_context(ctx);
 113                 return code;
 114         }
 115
 116         if ((code = krb5_cc_initialize(ctx, cc, me))) {
 117                 krb5_free_cred_contents(ctx, &my_creds);
 118                 krb5_free_principal(ctx, me);
 119                 krb5_free_context(ctx);
 120                 return code;
 121         }
 122
 123         if ((code = krb5_cc_store_cred(ctx, cc, &my_creds))) {
 124                 krb5_cc_close(ctx, cc);
 125                 krb5_free_cred_contents(ctx, &my_creds);
 126                 krb5_free_principal(ctx, me);
 127                 krb5_free_context(ctx);
 128                 return code;
 129         }
 130
 131         if (expire_time) {
 132                 *expire_time = (time_t) my_creds.times.endtime;
 133         }
 134
 135         if (renew_till_time) {
 136                 *renew_till_time = (time_t) my_creds.times.renew_till;
 137         }
 138
 139         krb5_cc_close(ctx, cc);
 140         krb5_free_cred_contents(ctx, &my_creds);
 141         krb5_free_principal(ctx, me);
 142         krb5_free_context(ctx);
 143
 144         return 0;
 145 }
 146
 147
 148
 149 /* run kinit to setup our ccache */
 150 int ads_kinit_password(ADS_STRUCT *ads)
 151 {
 152         char *s;
 153         int ret;
 154         const char *account_name;
 155         fstring acct_name;
 156
 157         if ( IS_DC ) {
 158                 /* this will end up getting a ticket for DOMAIN@RUSTED.REA.LM */
 159                 account_name = lp_workgroup();
 160         } else {
 161                 /* always use the sAMAccountName for security = domain */
 162                 /* global_myname()$@REA.LM */
 163                 if ( lp_security() == SEC_DOMAIN ) {
 164                         fstr_sprintf( acct_name, "%s$", global_myname() );
 165                         account_name = acct_name;
 166                 }
 167                 else
 168                         /* This looks like host/global_myname()@REA.LM */
 169                         account_name = ads->auth.user_name;
 170         }
 171
 172         if (asprintf(&s, "%s@%s", account_name, ads->auth.realm) == -1) {
 173                 return KRB5_CC_NOMEM;
 174         }
 175
 176         if (!ads->auth.password) {
 177                 return KRB5_LIBOS_CANTREADPWD;
 178         }
 179
 180         ret = kerberos_kinit_password(s, ads->auth.password, ads->auth.time_offset,
 181                         &ads->auth.expire, NULL, NULL, False, ads->auth.renewable);
 182
 183         if (ret) {
 184                 DEBUG(0,("kerberos_kinit_password %s failed: %s\n",
 185                          s, error_message(ret)));
 186         }
 187         free(s);
 188         return ret;
 189 }
 190
 191 int ads_kdestroy(const char *cc_name)
 192 {
 193         krb5_error_code code;
 194         krb5_context ctx = NULL;
 195         krb5_ccache cc = NULL;
 196
 197         initialize_krb5_error_table();
 198         if ((code = krb5_init_context (&ctx))) {
 199                 DEBUG(3, ("ads_kdestroy: kdb5_init_context failed: %s\n",
 200                         error_message(code)));
 201                 return code;
 202         }
 203
 204         if (!cc_name) {
 205                 if ((code = krb5_cc_default(ctx, &cc))) {
 206                         krb5_free_context(ctx);
 207                         return code;
 208                 }
 209         } else {
 210                 if ((code = krb5_cc_resolve(ctx, cc_name, &cc))) {
 211                         DEBUG(3, ("ads_kdestroy: krb5_cc_resolve failed: %s\n",
 212                                   error_message(code)));
 213                         krb5_free_context(ctx);
 214                         return code;
 215                 }
 216         }
 217
 218         if ((code = krb5_cc_destroy (ctx, cc))) {
 219                 DEBUG(3, ("ads_kdestroy: krb5_cc_destroy failed: %s\n",
 220                         error_message(code)));
 221         }
 222
 223         krb5_free_context (ctx);
 224         return code;
 225 }
 226
 227 /************************************************************************
 228  Routine to fetch the salting principal for a service.  Active
 229  Directory may use a non-obvious principal name to generate the salt
 230  when it determines the key to use for encrypting tickets for a service,
 231  and hopefully we detected that when we joined the domain.
 232  ************************************************************************/
 233
 234 static char *kerberos_secrets_fetch_salting_principal(const char *service, int enctype)
 235 {
 236         char *key = NULL;
 237         char *ret = NULL;
 238
 239         asprintf(&key, "%s/%s/enctype=%d", SECRETS_SALTING_PRINCIPAL, service, enctype);
 240         if (!key) {
 241                 return NULL;
 242         }
 243         ret = (char *)secrets_fetch(key, NULL);
 244         SAFE_FREE(key);
 245         return ret;
 246 }
 247
 248 /************************************************************************
 249  Routine to get the salting principal for this service.  Active
 250  Directory may use a non-obvious principal name to generate the salt
 251  when it determines the key to use for encrypting tickets for a service,
 252  and hopefully we detected that when we joined the domain.
 253  Caller must free if return is not null.
 254  ************************************************************************/
 255
 256 krb5_principal kerberos_fetch_salt_princ_for_host_princ(krb5_context context,
 257                                                         krb5_principal host_princ,
 258                                                         int enctype)
 259 {
 260         char *unparsed_name = NULL, *salt_princ_s = NULL;
 261         krb5_principal ret_princ = NULL;
 262
 263         if (krb5_unparse_name(context, host_princ, &unparsed_name) != 0) {
 264                 return (krb5_principal)NULL;
 265         }
 266
 267         if ((salt_princ_s = kerberos_secrets_fetch_salting_principal(unparsed_name, enctype)) == NULL) {
 268                 krb5_free_unparsed_name(context, unparsed_name);
 269                 return (krb5_principal)NULL;
 270         }
 271
 272         if (krb5_parse_name(context, salt_princ_s, &ret_princ) != 0) {
 273                 krb5_free_unparsed_name(context, unparsed_name);
 274                 SAFE_FREE(salt_princ_s);
 275                 return (krb5_principal)NULL;
 276         }
 277         krb5_free_unparsed_name(context, unparsed_name);
 278         SAFE_FREE(salt_princ_s);
 279         return ret_princ;
 280 }
 281
 282 /************************************************************************
 283  Routine to set the salting principal for this service.  Active
 284  Directory may use a non-obvious principal name to generate the salt
 285  when it determines the key to use for encrypting tickets for a service,
 286  and hopefully we detected that when we joined the domain.
 287  Setting principal to NULL deletes this entry.
 288  ************************************************************************/
 289
 290 BOOL kerberos_secrets_store_salting_principal(const char *service,
 291                                               int enctype,
 292                                               const char *principal)
 293 {
 294         char *key = NULL;
 295         BOOL ret = False;
 296         krb5_context context = NULL;
 297         krb5_principal princ = NULL;
 298         char *princ_s = NULL;
 299         char *unparsed_name = NULL;
 300
 301         krb5_init_context(&context);
 302         if (!context) {
 303                 return False;
 304         }
 305         if (strchr_m(service, '@')) {
 306                 asprintf(&princ_s, "%s", service);
 307         } else {
 308                 asprintf(&princ_s, "%s@%s", service, lp_realm());
 309         }
 310
 311         if (krb5_parse_name(context, princ_s, &princ) != 0) {
 312                 goto out;
 313
 314         }
 315         if (krb5_unparse_name(context, princ, &unparsed_name) != 0) {
 316                 goto out;
 317         }
 318
 319         asprintf(&key, "%s/%s/enctype=%d", SECRETS_SALTING_PRINCIPAL, unparsed_name, enctype);
 320         if (!key)  {
 321                 goto out;
 322         }
 323
 324         if ((principal != NULL) && (strlen(principal) > 0)) {
 325                 ret = secrets_store(key, principal, strlen(principal) + 1);
 326         } else {
 327                 ret = secrets_delete(key);
 328         }
 329
 330  out:
 331
 332         SAFE_FREE(key);
 333         SAFE_FREE(princ_s);
 334
 335         if (unparsed_name) {
 336                 krb5_free_unparsed_name(context, unparsed_name);
 337         }
 338         if (context) {
 339                 krb5_free_context(context);
 340         }
 341
 342         return ret;
 343 }
 344
 345 /************************************************************************
 346  Routine to get initial credentials as a service ticket for the local machine.
 347  Returns a buffer initialized with krb5_mk_req_extended.
 348  ************************************************************************/
 349
 350 static krb5_error_code get_service_ticket(krb5_context ctx,
 351                                         krb5_ccache ccache,
 352                                         const char *service_principal,
 353                                         int enctype,
 354                                         krb5_data *p_outbuf)
 355 {
 356         krb5_creds creds, *new_creds = NULL;
 357         char *service_s = NULL;
 358         char *machine_account = NULL, *password = NULL;
 359         krb5_data in_data;
 360         krb5_auth_context auth_context = NULL;
 361         krb5_error_code err = 0;
 362
 363         ZERO_STRUCT(creds);
 364
 365         asprintf(&machine_account, "%s$@%s", global_myname(), lp_realm());
 366         if (machine_account == NULL) {
 367                 goto out;
 368         }
 369         password = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
 370         if (password == NULL) {
 371                 goto out;
 372         }
 373         if ((err = kerberos_kinit_password(machine_account, password, 0, NULL, NULL,
 374                                            LIBADS_CCACHE_NAME, False, 0)) != 0) {
 375                 DEBUG(0,("get_service_ticket: kerberos_kinit_password %s@%s failed: %s\n",
 376                         machine_account,
 377                         lp_realm(),
 378                         error_message(err)));
 379                 goto out;
 380         }
 381
 382         /* Ok - the above call has gotten a TGT. Now we need to get a service
 383            ticket to ourselves. */
 384
 385         /* Set up the enctype and client and server principal fields for krb5_get_credentials. */
 386         kerberos_set_creds_enctype(&creds, enctype);
 387
 388         if ((err = krb5_cc_get_principal(ctx, ccache, &creds.client))) {
 389                 DEBUG(3, ("get_service_ticket: krb5_cc_get_principal failed: %s\n",
 390                         error_message(err)));
 391                 goto out;
 392         }
 393
 394         if (strchr_m(service_principal, '@')) {
 395                 asprintf(&service_s, "%s", service_principal);
 396         } else {
 397                 asprintf(&service_s, "%s@%s", service_principal, lp_realm());
 398         }
 399
 400         if ((err = krb5_parse_name(ctx, service_s, &creds.server))) {
 401                 DEBUG(0,("get_service_ticket: krb5_parse_name %s failed: %s\n",
 402                         service_s, error_message(err)));
 403                 goto out;
 404         }
 405
 406         if ((err = krb5_get_credentials(ctx, 0, ccache, &creds, &new_creds))) {
 407                 DEBUG(5,("get_service_ticket: krb5_get_credentials for %s enctype %d failed: %s\n",
 408                         service_s, enctype, error_message(err)));
 409                 goto out;
 410         }
 411
 412         memset(&in_data, '\0', sizeof(in_data));
 413         if ((err = krb5_mk_req_extended(ctx, &auth_context, 0, &in_data,
 414                         new_creds, p_outbuf)) != 0) {
 415                 DEBUG(0,("get_service_ticket: krb5_mk_req_extended failed: %s\n",
 416                         error_message(err)));
 417                 goto out;
 418         }
 419
 420  out:
 421
 422         if (auth_context) {
 423                 krb5_auth_con_free(ctx, auth_context);
 424         }
 425         if (new_creds) {
 426                 krb5_free_creds(ctx, new_creds);
 427         }
 428         if (creds.server) {
 429                 krb5_free_principal(ctx, creds.server);
 430         }
 431         if (creds.client) {
 432                 krb5_free_principal(ctx, creds.client);
 433         }
 434
 435         SAFE_FREE(service_s);
 436         SAFE_FREE(password);
 437         SAFE_FREE(machine_account);
 438         return err;
 439 }
 440
 441 /************************************************************************
 442  Check if the machine password can be used in conjunction with the salting_principal
 443  to generate a key which will successfully decrypt the AP_REQ already
 444  gotten as a message to the local machine.
 445  ************************************************************************/
 446
 447 static BOOL verify_service_password(krb5_context ctx,
 448                                     int enctype,
 449                                     const char *salting_principal,
 450                                     krb5_data *in_data)
 451 {
 452         BOOL ret = False;
 453         krb5_principal salting_kprinc = NULL;
 454         krb5_ticket *ticket = NULL;
 455         krb5_keyblock key;
 456         krb5_data passdata;
 457         char *salting_s = NULL;
 458         char *machine_account = NULL, *password = NULL;
 459         krb5_auth_context auth_context = NULL;
 460         krb5_error_code err;
 461
 462         memset(&passdata, '\0', sizeof(passdata));
 463         memset(&key, '\0', sizeof(key));
 464
 465         asprintf(&machine_account, "%s$@%s", global_myname(), lp_realm());
 466         if (machine_account == NULL) {
 467                 goto out;
 468         }
 469         password = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
 470         if (password == NULL) {
 471                 goto out;
 472         }
 473
 474         if (strchr_m(salting_principal, '@')) {
 475                 asprintf(&salting_s, "%s", salting_principal);
 476         } else {
 477                 asprintf(&salting_s, "%s@%s", salting_principal, lp_realm());
 478         }
 479
 480         if ((err = krb5_parse_name(ctx, salting_s, &salting_kprinc))) {
 481                 DEBUG(0,("verify_service_password: krb5_parse_name %s failed: %s\n",
 482                         salting_s, error_message(err)));
 483                 goto out;
 484         }
 485
 486         passdata.length = strlen(password);
 487         passdata.data = (char*)password;
 488         if ((err = create_kerberos_key_from_string_direct(ctx, salting_kprinc, &passdata, &key, enctype))) {
 489                 DEBUG(0,("verify_service_password: create_kerberos_key_from_string %d failed: %s\n",
 490                         enctype, error_message(err)));
 491                 goto out;
 492         }
 493
 494         if ((err = krb5_auth_con_init(ctx, &auth_context)) != 0) {
 495                 DEBUG(0,("verify_service_password: krb5_auth_con_init failed %s\n", error_message(err)));
 496                 goto out;
 497         }
 498
 499         if ((err = krb5_auth_con_setuseruserkey(ctx, auth_context, &key)) != 0) {
 500                 DEBUG(0,("verify_service_password: krb5_auth_con_setuseruserkey failed %s\n", error_message(err)));
 501                 goto out;
 502         }
 503
 504         if (!(err = krb5_rd_req(ctx, &auth_context, in_data, NULL, NULL, NULL, &ticket))) {
 505                 DEBUG(10,("verify_service_password: decrypted message with enctype %u salt %s!\n",
 506                                 (unsigned int)enctype, salting_s));
 507                 ret = True;
 508         }
 509
 510  out:
 511
 512         memset(&passdata, 0, sizeof(passdata));
 513         krb5_free_keyblock_contents(ctx, &key);
 514         if (ticket != NULL) {
 515                 krb5_free_ticket(ctx, ticket);
 516         }
 517         if (salting_kprinc) {
 518                 krb5_free_principal(ctx, salting_kprinc);
 519         }
 520         SAFE_FREE(salting_s);
 521         SAFE_FREE(password);
 522         SAFE_FREE(machine_account);
 523         return ret;
 524 }
 525
 526 /************************************************************************
 527  *
 528  * From the current draft of kerberos-clarifications:
 529  *
 530  *     It is not possible to reliably generate a user's key given a pass
 531  *     phrase without contacting the KDC, since it will not be known
 532  *     whether alternate salt or parameter values are required.
 533  *
 534  * And because our server has a password, we have this exact problem.  We
 535  * make multiple guesses as to which principal name provides the salt which
 536  * the KDC is using.
 537  *
 538  ************************************************************************/
 539
 540 static void kerberos_derive_salting_principal_for_enctype(const char *service_principal,
 541                                                           krb5_context ctx,
 542                                                           krb5_ccache ccache,
 543                                                           krb5_enctype enctype,
 544                                                           krb5_enctype *enctypes)
 545 {
 546         char *salting_principals[3] = {NULL, NULL, NULL}, *second_principal = NULL;
 547         krb5_error_code err = 0;
 548         krb5_data outbuf;
 549         int i, j;
 550
 551         memset(&outbuf, '\0', sizeof(outbuf));
 552
 553         /* Check that the service_principal is useful. */
 554         if ((service_principal == NULL) || (strlen(service_principal) == 0)) {
 555                 return;
 556         }
 557
 558         /* Generate our first guess -- the principal as-given. */
 559         asprintf(&salting_principals[0], "%s", service_principal);
 560         if ((salting_principals[0] == NULL) || (strlen(salting_principals[0]) == 0)) {
 561                 return;
 562         }
 563
 564         /* Generate our second guess -- the computer's principal, as Win2k3. */
 565         asprintf(&second_principal, "host/%s.%s", global_myname(), lp_realm());
 566         if (second_principal != NULL) {
 567                 strlower_m(second_principal);
 568                 asprintf(&salting_principals[1], "%s@%s", second_principal, lp_realm());
 569                 SAFE_FREE(second_principal);
 570         }
 571         if ((salting_principals[1] == NULL) || (strlen(salting_principals[1]) == 0)) {
 572                 goto out;
 573         }
 574
 575         /* Generate our third guess -- the computer's principal, as Win2k. */
 576         asprintf(&second_principal, "HOST/%s", global_myname());
 577         if (second_principal != NULL) {
 578                 strlower_m(second_principal + 5);
 579                 asprintf(&salting_principals[2], "%s@%s",
 580                         second_principal, lp_realm());
 581                 SAFE_FREE(second_principal);
 582         }
 583         if ((salting_principals[2] == NULL) || (strlen(salting_principals[2]) == 0)) {
 584                 goto out;
 585         }
 586
 587         /* Get a service ticket for ourselves into our memory ccache. */
 588         /* This will commonly fail if there is no principal by that name (and we're trying
 589            many names). So don't print a debug 0 error. */
 590
 591         if ((err = get_service_ticket(ctx, ccache, service_principal, enctype, &outbuf)) != 0) {
 592                 DEBUG(3, ("verify_service_password: get_service_ticket failed: %s\n",
 593                         error_message(err)));
 594                 goto out;
 595         }
 596
 597         /* At this point we have a message to ourselves, salted only the KDC knows how. We
 598            have to work out what that salting is. */
 599
 600         /* Try and find the correct salting principal. */
 601         for (i = 0; i < sizeof(salting_principals) / sizeof(salting_principals[i]); i++) {
 602                 if (verify_service_password(ctx, enctype, salting_principals[i], &outbuf)) {
 603                         break;
 604                 }
 605         }
 606
 607         /* If we failed to get a match, return. */
 608         if (i >= sizeof(salting_principals) / sizeof(salting_principals[i])) {
 609                 goto out;
 610         }
 611
 612         /* If we succeeded, store the principal for use for all enctypes which
 613          * share the same cipher and string-to-key function.  Doing this here
 614          * allows servers which just pass a keytab to krb5_rd_req() to work
 615          * correctly. */
 616         for (j = 0; enctypes[j] != 0; j++) {
 617                 if (enctype != enctypes[j]) {
 618                         /* If this enctype isn't compatible with the one which
 619                          * we used, skip it. */
 620
 621                         if (!kerberos_compatible_enctypes(ctx, enctypes[j], enctype))
 622                                 continue;
 623                 }
 624                 /* If the principal which gives us the proper salt is the one
 625                  * which we would normally guess, don't bother noting anything
 626                  * in the secrets tdb. */
 627                 if (strcmp(service_principal, salting_principals[i]) != 0) {
 628                         kerberos_secrets_store_salting_principal(service_principal,
 629                                                                 enctypes[j],
 630                                                                 salting_principals[i]);
 631                 }
 632         }
 633
 634  out :
 635
 636         kerberos_free_data_contents(ctx, &outbuf);
 637         SAFE_FREE(salting_principals[0]);
 638         SAFE_FREE(salting_principals[1]);
 639         SAFE_FREE(salting_principals[2]);
 640         SAFE_FREE(second_principal);
 641 }
 642
 643 /************************************************************************
 644  Go through all the possible enctypes for this principal.
 645  ************************************************************************/
 646
 647 static void kerberos_derive_salting_principal_direct(krb5_context context,
 648                                         krb5_ccache ccache,
 649                                         krb5_enctype *enctypes,
 650                                         char *service_principal)
 651 {
 652         int i;
 653
 654         /* Try for each enctype separately, because the rules are
 655          * different for different enctypes. */
 656         for (i = 0; enctypes[i] != 0; i++) {
 657                 /* Delete secrets entry first. */
 658                 kerberos_secrets_store_salting_principal(service_principal, 0, NULL);
 659 #ifdef ENCTYPE_ARCFOUR_HMAC
 660                 if (enctypes[i] == ENCTYPE_ARCFOUR_HMAC) {
 661                         /* Of course this'll always work, so just save
 662                          * ourselves the effort. */
 663                         continue;
 664                 }
 665 #endif
 666                 /* Try to figure out what's going on with this
 667                  * principal. */
 668                 kerberos_derive_salting_principal_for_enctype(service_principal,
 669                                                                 context,
 670                                                                 ccache,
 671                                                                 enctypes[i],
 672                                                                 enctypes);
 673         }
 674 }
 675
 676 /************************************************************************
 677  Wrapper function for the above.
 678  ************************************************************************/
 679
 680 BOOL kerberos_derive_salting_principal(char *service_principal)
 681 {
 682         krb5_context context = NULL;
 683         krb5_enctype *enctypes = NULL;
 684         krb5_ccache ccache = NULL;
 685         krb5_error_code ret = 0;
 686
 687         initialize_krb5_error_table();
 688         if ((ret = krb5_init_context(&context)) != 0) {
 689                 DEBUG(1,("kerberos_derive_cifs_salting_principals: krb5_init_context failed. %s\n",
 690                         error_message(ret)));
 691                 return False;
 692         }
 693         if ((ret = get_kerberos_allowed_etypes(context, &enctypes)) != 0) {
 694                 DEBUG(1,("kerberos_derive_cifs_salting_principals: get_kerberos_allowed_etypes failed. %s\n",
 695                         error_message(ret)));
 696                 goto out;
 697         }
 698
 699         if ((ret = krb5_cc_resolve(context, LIBADS_CCACHE_NAME, &ccache)) != 0) {
 700                 DEBUG(3, ("get_service_ticket: krb5_cc_resolve for %s failed: %s\n",
 701                         LIBADS_CCACHE_NAME, error_message(ret)));
 702                 goto out;
 703         }
 704
 705         kerberos_derive_salting_principal_direct(context, ccache, enctypes, service_principal);
 706
 707   out:
 708         if (enctypes) {
 709                 free_kerberos_etypes(context, enctypes);
 710         }
 711         if (ccache) {
 712                 krb5_cc_destroy(context, ccache);
 713         }
 714         if (context) {
 715                 krb5_free_context(context);
 716         }
 717
 718         return ret ? False : True;
 719 }
 720
 721 /************************************************************************
 722  Core function to try and determine what salt is being used for any keytab
 723  keys.
 724  ************************************************************************/
 725
 726 BOOL kerberos_derive_cifs_salting_principals(void)
 727 {
 728         fstring my_fqdn;
 729         char *service = NULL;
 730         krb5_context context = NULL;
 731         krb5_enctype *enctypes = NULL;
 732         krb5_ccache ccache = NULL;
 733         krb5_error_code ret = 0;
 734         BOOL retval = False;
 735
 736         initialize_krb5_error_table();
 737         if ((ret = krb5_init_context(&context)) != 0) {
 738                 DEBUG(1,("kerberos_derive_cifs_salting_principals: krb5_init_context failed. %s\n",
 739                         error_message(ret)));
 740                 return False;
 741         }
 742         if ((ret = get_kerberos_allowed_etypes(context, &enctypes)) != 0) {
 743                 DEBUG(1,("kerberos_derive_cifs_salting_principals: get_kerberos_allowed_etypes failed. %s\n",
 744                         error_message(ret)));
 745                 goto out;
 746         }
 747
 748         if ((ret = krb5_cc_resolve(context, LIBADS_CCACHE_NAME, &ccache)) != 0) {
 749                 DEBUG(3, ("get_service_ticket: krb5_cc_resolve for %s failed: %s\n",
 750                         LIBADS_CCACHE_NAME, error_message(ret)));
 751                 goto out;
 752         }
 753
 754         if (asprintf(&service, "%s$", global_myname()) != -1) {
 755                 strlower_m(service);
 756                 kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
 757                 SAFE_FREE(service);
 758         }
 759         if (asprintf(&service, "cifs/%s", global_myname()) != -1) {
 760                 strlower_m(service);
 761                 kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
 762                 SAFE_FREE(service);
 763         }
 764         if (asprintf(&service, "host/%s", global_myname()) != -1) {
 765                 strlower_m(service);
 766                 kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
 767                 SAFE_FREE(service);
 768         }
 769         if (asprintf(&service, "cifs/%s.%s", global_myname(), lp_realm()) != -1) {
 770                 strlower_m(service);
 771                 kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
 772                 SAFE_FREE(service);
 773         }
 774         if (asprintf(&service, "host/%s.%s", global_myname(), lp_realm()) != -1) {
 775                 strlower_m(service);
 776                 kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
 777                 SAFE_FREE(service);
 778         }
 779         name_to_fqdn(my_fqdn, global_myname());
 780         if (asprintf(&service, "cifs/%s", my_fqdn) != -1) {
 781                 strlower_m(service);
 782                 kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
 783                 SAFE_FREE(service);
 784         }
 785         if (asprintf(&service, "host/%s", my_fqdn) != -1) {
 786                 strlower_m(service);
 787                 kerberos_derive_salting_principal_direct(context, ccache, enctypes, service);
 788                 SAFE_FREE(service);
 789         }
 790
 791         retval = True;
 792
 793   out:
 794         if (enctypes) {
 795                 free_kerberos_etypes(context, enctypes);
 796         }
 797         if (ccache) {
 798                 krb5_cc_destroy(context, ccache);
 799         }
 800         if (context) {
 801                 krb5_free_context(context);
 802         }
 803         return retval;
 804 }
 805 #endif