source3/passdb/lookup_sid.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    uid/user handling
   4    Copyright (C) Andrew Tridgell         1992-1998
   5    Copyright (C) Gerald (Jerry) Carter   2003
   6    Copyright (C) Volker Lendecke         2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23
  24 /*****************************************************************
  25  Dissect a user-provided name into domain, name, sid and type.
  26
  27  If an explicit domain name was given in the form domain\user, it
  28  has to try that. If no explicit domain name was given, we have
  29  to do guesswork.
  30 *****************************************************************/
  31
  32 bool lookup_name(TALLOC_CTX *mem_ctx,
  33                  const char *full_name, int flags,
  34                  const char **ret_domain, const char **ret_name,
  35                  DOM_SID *ret_sid, enum lsa_SidType *ret_type)
  36 {
  37         char *p;
  38         const char *tmp;
  39         const char *domain = NULL;
  40         const char *name = NULL;
  41         uint32 rid;
  42         DOM_SID sid;
  43         enum lsa_SidType type;
  44         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
  45
  46         if (tmp_ctx == NULL) {
  47                 DEBUG(0, ("talloc_new failed\n"));
  48                 return false;
  49         }
  50
  51         p = strchr_m(full_name, '\\');
  52
  53         if (p != NULL) {
  54                 domain = talloc_strndup(tmp_ctx, full_name,
  55                                         PTR_DIFF(p, full_name));
  56                 name = talloc_strdup(tmp_ctx, p+1);
  57         } else {
  58                 domain = talloc_strdup(tmp_ctx, "");
  59                 name = talloc_strdup(tmp_ctx, full_name);
  60         }
  61
  62         if ((domain == NULL) || (name == NULL)) {
  63                 DEBUG(0, ("talloc failed\n"));
  64                 TALLOC_FREE(tmp_ctx);
  65                 return false;
  66         }
  67
  68         DEBUG(10,("lookup_name: %s => %s (domain), %s (name)\n",
  69                 full_name, domain, name));
  70         DEBUG(10, ("lookup_name: flags = 0x0%x\n", flags));
  71
  72         if ((flags & LOOKUP_NAME_DOMAIN) &&
  73             strequal(domain, get_global_sam_name()))
  74         {
  75
  76                 /* It's our own domain, lookup the name in passdb */
  77                 if (lookup_global_sam_name(name, flags, &rid, &type)) {
  78                         sid_copy(&sid, get_global_sam_sid());
  79                         sid_append_rid(&sid, rid);
  80                         goto ok;
  81                 }
  82                 TALLOC_FREE(tmp_ctx);
  83                 return false;
  84         }
  85
  86         if ((flags & LOOKUP_NAME_BUILTIN) &&
  87             strequal(domain, builtin_domain_name()))
  88         {
  89                 /* Explicit request for a name in BUILTIN */
  90                 if (lookup_builtin_name(name, &rid)) {
  91                         sid_copy(&sid, &global_sid_Builtin);
  92                         sid_append_rid(&sid, rid);
  93                         type = SID_NAME_ALIAS;
  94                         goto ok;
  95                 }
  96                 TALLOC_FREE(tmp_ctx);
  97                 return false;
  98         }
  99
 100         /* Try the explicit winbind lookup first, don't let it guess the
 101          * domain yet at this point yet. This comes later. */
 102
 103         if ((domain[0] != '\0') &&
 104             (flags & ~(LOOKUP_NAME_DOMAIN|LOOKUP_NAME_ISOLATED)) &&
 105             (winbind_lookup_name(domain, name, &sid, &type))) {
 106                         goto ok;
 107         }
 108
 109         if (!(flags & LOOKUP_NAME_EXPLICIT) && strequal(domain, unix_users_domain_name())) {
 110                 if (lookup_unix_user_name(name, &sid)) {
 111                         type = SID_NAME_USER;
 112                         goto ok;
 113                 }
 114                 TALLOC_FREE(tmp_ctx);
 115                 return false;
 116         }
 117
 118         if (!(flags & LOOKUP_NAME_EXPLICIT) && strequal(domain, unix_groups_domain_name())) {
 119                 if (lookup_unix_group_name(name, &sid)) {
 120                         type = SID_NAME_DOM_GRP;
 121                         goto ok;
 122                 }
 123                 TALLOC_FREE(tmp_ctx);
 124                 return false;
 125         }
 126
 127         if ((domain[0] == '\0') && (!(flags & LOOKUP_NAME_ISOLATED))) {
 128                 TALLOC_FREE(tmp_ctx);
 129                 return false;
 130         }
 131
 132         /* Now the guesswork begins, we haven't been given an explicit
 133          * domain. Try the sequence as documented on
 134          * http://msdn.microsoft.com/library/en-us/secmgmt/security/lsalookupnames.asp
 135          * November 27, 2005 */
 136
 137         /* 1. well-known names */
 138
 139         if ((flags & LOOKUP_NAME_WKN) &&
 140             lookup_wellknown_name(tmp_ctx, name, &sid, &domain))
 141         {
 142                 type = SID_NAME_WKN_GRP;
 143                 goto ok;
 144         }
 145
 146         /* 2. Builtin domain as such */
 147
 148         if ((flags & (LOOKUP_NAME_BUILTIN|LOOKUP_NAME_REMOTE)) &&
 149             strequal(name, builtin_domain_name()))
 150         {
 151                 /* Swap domain and name */
 152                 tmp = name; name = domain; domain = tmp;
 153                 sid_copy(&sid, &global_sid_Builtin);
 154                 type = SID_NAME_DOMAIN;
 155                 goto ok;
 156         }
 157
 158         /* 3. Account domain */
 159
 160         if ((flags & LOOKUP_NAME_DOMAIN) &&
 161             strequal(name, get_global_sam_name()))
 162         {
 163                 if (!secrets_fetch_domain_sid(name, &sid)) {
 164                         DEBUG(3, ("Could not fetch my SID\n"));
 165                         TALLOC_FREE(tmp_ctx);
 166                         return false;
 167                 }
 168                 /* Swap domain and name */
 169                 tmp = name; name = domain; domain = tmp;
 170                 type = SID_NAME_DOMAIN;
 171                 goto ok;
 172         }
 173
 174         /* 4. Primary domain */
 175
 176         if ((flags & LOOKUP_NAME_DOMAIN) && !IS_DC &&
 177             strequal(name, lp_workgroup()))
 178         {
 179                 if (!secrets_fetch_domain_sid(name, &sid)) {
 180                         DEBUG(3, ("Could not fetch the domain SID\n"));
 181                         TALLOC_FREE(tmp_ctx);
 182                         return false;
 183                 }
 184                 /* Swap domain and name */
 185                 tmp = name; name = domain; domain = tmp;
 186                 type = SID_NAME_DOMAIN;
 187                 goto ok;
 188         }
 189
 190         /* 5. Trusted domains as such, to me it looks as if members don't do
 191               this, tested an XP workstation in a NT domain -- vl */
 192
 193         if ((flags & LOOKUP_NAME_REMOTE) && IS_DC &&
 194             (pdb_get_trusteddom_pw(name, NULL, &sid, NULL)))
 195         {
 196                 /* Swap domain and name */
 197                 tmp = name; name = domain; domain = tmp;
 198                 type = SID_NAME_DOMAIN;
 199                 goto ok;
 200         }
 201
 202         /* 6. Builtin aliases */
 203
 204         if ((flags & LOOKUP_NAME_BUILTIN) &&
 205             lookup_builtin_name(name, &rid))
 206         {
 207                 domain = talloc_strdup(tmp_ctx, builtin_domain_name());
 208                 sid_copy(&sid, &global_sid_Builtin);
 209                 sid_append_rid(&sid, rid);
 210                 type = SID_NAME_ALIAS;
 211                 goto ok;
 212         }
 213
 214         /* 7. Local systems' SAM (DCs don't have a local SAM) */
 215         /* 8. Primary SAM (On members, this is the domain) */
 216
 217         /* Both cases are done by looking at our passdb */
 218
 219         if ((flags & LOOKUP_NAME_DOMAIN) &&
 220             lookup_global_sam_name(name, flags, &rid, &type))
 221         {
 222                 domain = talloc_strdup(tmp_ctx, get_global_sam_name());
 223                 sid_copy(&sid, get_global_sam_sid());
 224                 sid_append_rid(&sid, rid);
 225                 goto ok;
 226         }
 227
 228         /* Now our local possibilities are exhausted. */
 229
 230         if (!(flags & LOOKUP_NAME_REMOTE)) {
 231                 TALLOC_FREE(tmp_ctx);
 232                 return false;
 233         }
 234
 235         /* If we are not a DC, we have to ask in our primary domain. Let
 236          * winbind do that. */
 237
 238         if (!IS_DC &&
 239             (winbind_lookup_name(lp_workgroup(), name, &sid, &type))) {
 240                 domain = talloc_strdup(tmp_ctx, lp_workgroup());
 241                 goto ok;
 242         }
 243
 244         /* 9. Trusted domains */
 245
 246         /* If we're a DC we have to ask all trusted DC's. Winbind does not do
 247          * that (yet), but give it a chance. */
 248
 249         if (IS_DC && winbind_lookup_name("", name, &sid, &type)) {
 250                 DOM_SID dom_sid;
 251                 uint32 tmp_rid;
 252                 enum lsa_SidType domain_type;
 253
 254                 if (type == SID_NAME_DOMAIN) {
 255                         /* Swap name and type */
 256                         tmp = name; name = domain; domain = tmp;
 257                         goto ok;
 258                 }
 259
 260                 /* Here we have to cope with a little deficiency in the
 261                  * winbind API: We have to ask it again for the name of the
 262                  * domain it figured out itself. Maybe fix that later... */
 263
 264                 sid_copy(&dom_sid, &sid);
 265                 sid_split_rid(&dom_sid, &tmp_rid);
 266
 267                 if (!winbind_lookup_sid(tmp_ctx, &dom_sid, &domain, NULL,
 268                                         &domain_type) ||
 269                     (domain_type != SID_NAME_DOMAIN)) {
 270                         DEBUG(2, ("winbind could not find the domain's name "
 271                                   "it just looked up for us\n"));
 272                         TALLOC_FREE(tmp_ctx);
 273                         return false;
 274                 }
 275                 goto ok;
 276         }
 277
 278         /* 10. Don't translate */
 279
 280         /* 11. Ok, windows would end here. Samba has two more options:
 281                Unmapped users and unmapped groups */
 282
 283         if (!(flags & LOOKUP_NAME_EXPLICIT) && lookup_unix_user_name(name, &sid)) {
 284                 domain = talloc_strdup(tmp_ctx, unix_users_domain_name());
 285                 type = SID_NAME_USER;
 286                 goto ok;
 287         }
 288
 289         if (!(flags & LOOKUP_NAME_EXPLICIT) && lookup_unix_group_name(name, &sid)) {
 290                 domain = talloc_strdup(tmp_ctx, unix_groups_domain_name());
 291                 type = SID_NAME_DOM_GRP;
 292                 goto ok;
 293         }
 294
 295         /*
 296          * Ok, all possibilities tried. Fail.
 297          */
 298
 299         TALLOC_FREE(tmp_ctx);
 300         return false;
 301
 302  ok:
 303         if ((domain == NULL) || (name == NULL)) {
 304                 DEBUG(0, ("talloc failed\n"));
 305                 TALLOC_FREE(tmp_ctx);
 306                 return false;
 307         }
 308
 309         /*
 310          * Hand over the results to the talloc context we've been given.
 311          */
 312
 313         if ((ret_name != NULL) &&
 314             !(*ret_name = talloc_strdup(mem_ctx, name))) {
 315                 DEBUG(0, ("talloc failed\n"));
 316                 TALLOC_FREE(tmp_ctx);
 317                 return false;
 318         }
 319
 320         if (ret_domain != NULL) {
 321                 char *tmp_dom;
 322                 if (!(tmp_dom = talloc_strdup(mem_ctx, domain))) {
 323                         DEBUG(0, ("talloc failed\n"));
 324                         TALLOC_FREE(tmp_ctx);
 325                         return false;
 326                 }
 327                 strupper_m(tmp_dom);
 328                 *ret_domain = tmp_dom;
 329         }
 330
 331         if (ret_sid != NULL) {
 332                 sid_copy(ret_sid, &sid);
 333         }
 334
 335         if (ret_type != NULL) {
 336                 *ret_type = type;
 337         }
 338
 339         TALLOC_FREE(tmp_ctx);
 340         return true;
 341 }
 342
 343 /************************************************************************
 344  Names from smb.conf can be unqualified. eg. valid users = foo
 345  These names should never map to a remote name. Try global_sam_name()\foo,
 346  and then "Unix Users"\foo (or "Unix Groups"\foo).
 347 ************************************************************************/
 348
 349 bool lookup_name_smbconf(TALLOC_CTX *mem_ctx,
 350                  const char *full_name, int flags,
 351                  const char **ret_domain, const char **ret_name,
 352                  DOM_SID *ret_sid, enum lsa_SidType *ret_type)
 353 {
 354         char *qualified_name;
 355         const char *p;
 356
 357         /* NB. No winbindd_separator here as lookup_name needs \\' */
 358         if ((p = strchr_m(full_name, *lp_winbind_separator())) != NULL) {
 359
 360                 /* The name is already qualified with a domain. */
 361
 362                 if (*lp_winbind_separator() != '\\') {
 363                         char *tmp;
 364
 365                         /* lookup_name() needs '\\' as a separator */
 366
 367                         tmp = talloc_strdup(mem_ctx, full_name);
 368                         if (!tmp) {
 369                                 return false;
 370                         }
 371                         tmp[p - full_name] = '\\';
 372                         full_name = tmp;
 373                 }
 374
 375                 return lookup_name(mem_ctx, full_name, flags,
 376                                 ret_domain, ret_name,
 377                                 ret_sid, ret_type);
 378         }
 379
 380         /* Try with our own SAM name. */
 381         qualified_name = talloc_asprintf(mem_ctx, "%s\\%s",
 382                                 get_global_sam_name(),
 383                                 full_name );
 384         if (!qualified_name) {
 385                 return false;
 386         }
 387
 388         if (lookup_name(mem_ctx, qualified_name, flags,
 389                                 ret_domain, ret_name,
 390                                 ret_sid, ret_type)) {
 391                 return true;
 392         }
 393
 394         /* Finally try with "Unix Users" or "Unix Group" */
 395         qualified_name = talloc_asprintf(mem_ctx, "%s\\%s",
 396                                 flags & LOOKUP_NAME_GROUP ?
 397                                         unix_groups_domain_name() :
 398                                         unix_users_domain_name(),
 399                                 full_name );
 400         if (!qualified_name) {
 401                 return false;
 402         }
 403
 404         return lookup_name(mem_ctx, qualified_name, flags,
 405                                 ret_domain, ret_name,
 406                                 ret_sid, ret_type);
 407 }
 408
 409 static bool wb_lookup_rids(TALLOC_CTX *mem_ctx,
 410                            const DOM_SID *domain_sid,
 411                            int num_rids, uint32 *rids,
 412                            const char **domain_name,
 413                            const char **names, enum lsa_SidType *types)
 414 {
 415         int i;
 416         const char **my_names;
 417         enum lsa_SidType *my_types;
 418         TALLOC_CTX *tmp_ctx;
 419
 420         if (!(tmp_ctx = talloc_init("wb_lookup_rids"))) {
 421                 return false;
 422         }
 423
 424         if (!winbind_lookup_rids(tmp_ctx, domain_sid, num_rids, rids,
 425                                  domain_name, &my_names, &my_types)) {
 426                 *domain_name = "";
 427                 for (i=0; i<num_rids; i++) {
 428                         names[i] = "";
 429                         types[i] = SID_NAME_UNKNOWN;
 430                 }
 431                 TALLOC_FREE(tmp_ctx);
 432                 return true;
 433         }
 434
 435         if (!(*domain_name = talloc_strdup(mem_ctx, *domain_name))) {
 436                 TALLOC_FREE(tmp_ctx);
 437                 return false;
 438         }
 439
 440         /*
 441          * winbind_lookup_rids allocates its own array. We've been given the
 442          * array, so copy it over
 443          */
 444
 445         for (i=0; i<num_rids; i++) {
 446                 if (my_names[i] == NULL) {
 447                         TALLOC_FREE(tmp_ctx);
 448                         return false;
 449                 }
 450                 if (!(names[i] = talloc_strdup(names, my_names[i]))) {
 451                         TALLOC_FREE(tmp_ctx);
 452                         return false;
 453                 }
 454                 types[i] = my_types[i];
 455         }
 456         TALLOC_FREE(tmp_ctx);
 457         return true;
 458 }
 459
 460 static bool lookup_rids(TALLOC_CTX *mem_ctx, const DOM_SID *domain_sid,
 461                         int num_rids, uint32_t *rids,
 462                         const char **domain_name,
 463                         const char ***names, enum lsa_SidType **types)
 464 {
 465         int i;
 466
 467         DEBUG(10, ("lookup_rids called for domain sid '%s'\n",
 468                    sid_string_dbg(domain_sid)));
 469
 470         if (num_rids) {
 471                 *names = TALLOC_ARRAY(mem_ctx, const char *, num_rids);
 472                 *types = TALLOC_ARRAY(mem_ctx, enum lsa_SidType, num_rids);
 473
 474                 if ((*names == NULL) || (*types == NULL)) {
 475                         return false;
 476                 }
 477         } else {
 478                 *names = NULL;
 479                 *types = NULL;
 480         }
 481
 482         if (sid_check_is_domain(domain_sid)) {
 483                 NTSTATUS result;
 484
 485                 if (*domain_name == NULL) {
 486                         *domain_name = talloc_strdup(
 487                                 mem_ctx, get_global_sam_name());
 488                 }
 489
 490                 if (*domain_name == NULL) {
 491                         return false;
 492                 }
 493
 494                 become_root();
 495                 result = pdb_lookup_rids(domain_sid, num_rids, rids,
 496                                          *names, *types);
 497                 unbecome_root();
 498
 499                 return (NT_STATUS_IS_OK(result) ||
 500                         NT_STATUS_EQUAL(result, NT_STATUS_NONE_MAPPED) ||
 501                         NT_STATUS_EQUAL(result, STATUS_SOME_UNMAPPED));
 502         }
 503
 504         if (sid_check_is_builtin(domain_sid)) {
 505
 506                 if (*domain_name == NULL) {
 507                         *domain_name = talloc_strdup(
 508                                 mem_ctx, builtin_domain_name());
 509                 }
 510
 511                 if (*domain_name == NULL) {
 512                         return false;
 513                 }
 514
 515                 for (i=0; i<num_rids; i++) {
 516                         if (lookup_builtin_rid(*names, rids[i],
 517                                                &(*names)[i])) {
 518                                 if ((*names)[i] == NULL) {
 519                                         return false;
 520                                 }
 521                                 (*types)[i] = SID_NAME_ALIAS;
 522                         } else {
 523                                 (*types)[i] = SID_NAME_UNKNOWN;
 524                         }
 525                 }
 526                 return true;
 527         }
 528
 529         if (sid_check_is_wellknown_domain(domain_sid, NULL)) {
 530                 for (i=0; i<num_rids; i++) {
 531                         DOM_SID sid;
 532                         sid_copy(&sid, domain_sid);
 533                         sid_append_rid(&sid, rids[i]);
 534                         if (lookup_wellknown_sid(mem_ctx, &sid,
 535                                                  domain_name, &(*names)[i])) {
 536                                 if ((*names)[i] == NULL) {
 537                                         return false;
 538                                 }
 539                                 (*types)[i] = SID_NAME_WKN_GRP;
 540                         } else {
 541                                 (*types)[i] = SID_NAME_UNKNOWN;
 542                         }
 543                 }
 544                 return true;
 545         }
 546
 547         if (sid_check_is_unix_users(domain_sid)) {
 548                 if (*domain_name == NULL) {
 549                         *domain_name = talloc_strdup(
 550                                 mem_ctx, unix_users_domain_name());
 551                         if (*domain_name == NULL) {
 552                                 return false;
 553                         }
 554                 }
 555                 for (i=0; i<num_rids; i++) {
 556                         (*names)[i] = talloc_strdup(
 557                                 (*names), uidtoname(rids[i]));
 558                         if ((*names)[i] == NULL) {
 559                                 return false;
 560                         }
 561                         (*types)[i] = SID_NAME_USER;
 562                 }
 563                 return true;
 564         }
 565
 566         if (sid_check_is_unix_groups(domain_sid)) {
 567                 if (*domain_name == NULL) {
 568                         *domain_name = talloc_strdup(
 569                                 mem_ctx, unix_groups_domain_name());
 570                         if (*domain_name == NULL) {
 571                                 return false;
 572                         }
 573                 }
 574                 for (i=0; i<num_rids; i++) {
 575                         (*names)[i] = talloc_strdup(
 576                                 (*names), gidtoname(rids[i]));
 577                         if ((*names)[i] == NULL) {
 578                                 return false;
 579                         }
 580                         (*types)[i] = SID_NAME_DOM_GRP;
 581                 }
 582                 return true;
 583         }
 584
 585         return wb_lookup_rids(mem_ctx, domain_sid, num_rids, rids,
 586                               domain_name, *names, *types);
 587 }
 588
 589 /*
 590  * Is the SID a domain as such? If yes, lookup its name.
 591  */
 592
 593 static bool lookup_as_domain(const DOM_SID *sid, TALLOC_CTX *mem_ctx,
 594                              const char **name)
 595 {
 596         const char *tmp;
 597         enum lsa_SidType type;
 598
 599         if (sid_check_is_domain(sid)) {
 600                 *name = talloc_strdup(mem_ctx, get_global_sam_name());
 601                 return true;
 602         }
 603
 604         if (sid_check_is_builtin(sid)) {
 605                 *name = talloc_strdup(mem_ctx, builtin_domain_name());
 606                 return true;
 607         }
 608
 609         if (sid_check_is_wellknown_domain(sid, &tmp)) {
 610                 *name = talloc_strdup(mem_ctx, tmp);
 611                 return true;
 612         }
 613
 614         if (sid_check_is_unix_users(sid)) {
 615                 *name = talloc_strdup(mem_ctx, unix_users_domain_name());
 616                 return true;
 617         }
 618
 619         if (sid_check_is_unix_groups(sid)) {
 620                 *name = talloc_strdup(mem_ctx, unix_groups_domain_name());
 621                 return true;
 622         }
 623
 624         if (sid->num_auths != 4) {
 625                 /* This can't be a domain */
 626                 return false;
 627         }
 628
 629         if (IS_DC) {
 630                 uint32 i, num_domains;
 631                 struct trustdom_info **domains;
 632
 633                 /* This is relatively expensive, but it happens only on DCs
 634                  * and for SIDs that have 4 sub-authorities and thus look like
 635                  * domains */
 636
 637                 if (!NT_STATUS_IS_OK(pdb_enum_trusteddoms(mem_ctx,
 638                                                           &num_domains,
 639                                                           &domains))) {
 640                         return false;
 641                 }
 642
 643                 for (i=0; i<num_domains; i++) {
 644                         if (sid_equal(sid, &domains[i]->sid)) {
 645                                 *name = talloc_strdup(mem_ctx,
 646                                                       domains[i]->name);
 647                                 return true;
 648                         }
 649                 }
 650                 return false;
 651         }
 652
 653         if (winbind_lookup_sid(mem_ctx, sid, &tmp, NULL, &type) &&
 654             (type == SID_NAME_DOMAIN)) {
 655                 *name = tmp;
 656                 return true;
 657         }
 658
 659         return false;
 660 }
 661
 662 /*
 663  * This tries to implement the rather weird rules for the lsa_lookup level
 664  * parameter.
 665  *
 666  * This is as close as we can get to what W2k3 does. With this we survive the
 667  * RPC-LSALOOKUP samba4 test as of 2006-01-08. NT4 as a PDC is a bit more
 668  * different, but I assume that's just being too liberal. For example, W2k3
 669  * replies to everything else but the levels 1-6 with INVALID_PARAMETER
 670  * whereas NT4 does the same as level 1 (I think). I did not fully test that
 671  * with NT4, this is what w2k3 does.
 672  *
 673  * Level 1: Ask everywhere
 674  * Level 2: Ask domain and trusted domains, no builtin and wkn
 675  * Level 3: Only ask domain
 676  * Level 4: W2k3ad: Only ask AD trusts
 677  * Level 5: Only ask transitive forest trusts
 678  * Level 6: Like 4
 679  */
 680
 681 static bool check_dom_sid_to_level(const DOM_SID *sid, int level)
 682 {
 683         int ret = false;
 684
 685         switch(level) {
 686         case 1:
 687                 ret = true;
 688                 break;
 689         case 2:
 690                 ret = (!sid_check_is_builtin(sid) &&
 691                        !sid_check_is_wellknown_domain(sid, NULL));
 692                 break;
 693         case 3:
 694         case 4:
 695         case 6:
 696                 ret = sid_check_is_domain(sid);
 697                 break;
 698         case 5:
 699                 ret = false;
 700                 break;
 701         }
 702
 703         DEBUG(10, ("%s SID %s in level %d\n",
 704                    ret ? "Accepting" : "Rejecting",
 705                    sid_string_dbg(sid), level));
 706         return ret;
 707 }
 708
 709 /*
 710  * Lookup a bunch of SIDs. This is modeled after lsa_lookup_sids with
 711  * references to domains, it is explicitly made for this.
 712  *
 713  * This attempts to be as efficient as possible: It collects all SIDs
 714  * belonging to a domain and hands them in bulk to the appropriate lookup
 715  * function. In particular pdb_lookup_rids with ldapsam_trusted benefits
 716  * *hugely* from this. Winbind is going to be extended with a lookup_rids
 717  * interface as well, so on a DC we can do a bulk lsa_lookuprids to the
 718  * appropriate DC.
 719  */
 720
 721 NTSTATUS lookup_sids(TALLOC_CTX *mem_ctx, int num_sids,
 722                      const DOM_SID **sids, int level,
 723                      struct lsa_dom_info **ret_domains,
 724                      struct lsa_name_info **ret_names)
 725 {
 726         TALLOC_CTX *tmp_ctx;
 727         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
 728         struct lsa_name_info *name_infos;
 729         struct lsa_dom_info *dom_infos = NULL;
 730
 731         int i, j;
 732
 733         if (!(tmp_ctx = talloc_new(mem_ctx))) {
 734                 DEBUG(0, ("talloc_new failed\n"));
 735                 return NT_STATUS_NO_MEMORY;
 736         }
 737
 738         if (num_sids) {
 739                 name_infos = TALLOC_ARRAY(mem_ctx, struct lsa_name_info, num_sids);
 740                 if (name_infos == NULL) {
 741                         result = NT_STATUS_NO_MEMORY;
 742                         goto fail;
 743                 }
 744         } else {
 745                 name_infos = NULL;
 746         }
 747
 748         dom_infos = TALLOC_ZERO_ARRAY(mem_ctx, struct lsa_dom_info,
 749                                       MAX_REF_DOMAINS);
 750         if (dom_infos == NULL) {
 751                 result = NT_STATUS_NO_MEMORY;
 752                 goto fail;
 753         }
 754
 755         /* First build up the data structures:
 756          *
 757          * dom_infos is a list of domains referenced in the list of
 758          * SIDs. Later we will walk the list of domains and look up the RIDs
 759          * in bulk.
 760          *
 761          * name_infos is a shadow-copy of the SIDs array to collect the real
 762          * data.
 763          *
 764          * dom_info->idxs is an index into the name_infos array. The
 765          * difficulty we have here is that we need to keep the SIDs the client
 766          * asked for in the same order for the reply
 767          */
 768
 769         for (i=0; i<num_sids; i++) {
 770                 DOM_SID sid;
 771                 uint32 rid;
 772                 const char *domain_name = NULL;
 773
 774                 sid_copy(&sid, sids[i]);
 775                 name_infos[i].type = SID_NAME_USE_NONE;
 776
 777                 if (lookup_as_domain(&sid, name_infos, &domain_name)) {
 778                         /* We can't push that through the normal lookup
 779                          * process, as this would reference illegal
 780                          * domains.
 781                          *
 782                          * For example S-1-5-32 would end up referencing
 783                          * domain S-1-5- with RID 32 which is clearly wrong.
 784                          */
 785                         if (domain_name == NULL) {
 786                                 result = NT_STATUS_NO_MEMORY;
 787                                 goto fail;
 788                         }
 789
 790                         name_infos[i].rid = 0;
 791                         name_infos[i].type = SID_NAME_DOMAIN;
 792                         name_infos[i].name = NULL;
 793
 794                         if (sid_check_is_builtin(&sid)) {
 795                                 /* Yes, W2k3 returns "BUILTIN" both as domain
 796                                  * and name here */
 797                                 name_infos[i].name = talloc_strdup(
 798                                         name_infos, builtin_domain_name());
 799                                 if (name_infos[i].name == NULL) {
 800                                         result = NT_STATUS_NO_MEMORY;
 801                                         goto fail;
 802                                 }
 803                         }
 804                 } else {
 805                         /* This is a normal SID with rid component */
 806                         if (!sid_split_rid(&sid, &rid)) {
 807                                 result = NT_STATUS_INVALID_PARAMETER;
 808                                 goto fail;
 809                         }
 810                 }
 811
 812                 if (!check_dom_sid_to_level(&sid, level)) {
 813                         name_infos[i].rid = 0;
 814                         name_infos[i].type = SID_NAME_UNKNOWN;
 815                         name_infos[i].name = NULL;
 816                         continue;
 817                 }
 818
 819                 for (j=0; j<MAX_REF_DOMAINS; j++) {
 820                         if (!dom_infos[j].valid) {
 821                                 break;
 822                         }
 823                         if (sid_equal(&sid, &dom_infos[j].sid)) {
 824                                 break;
 825                         }
 826                 }
 827
 828                 if (j == MAX_REF_DOMAINS) {
 829                         /* TODO: What's the right error message here? */
 830                         result = NT_STATUS_NONE_MAPPED;
 831                         goto fail;
 832                 }
 833
 834                 if (!dom_infos[j].valid) {
 835                         /* We found a domain not yet referenced, create a new
 836                          * ref. */
 837                         dom_infos[j].valid = true;
 838                         sid_copy(&dom_infos[j].sid, &sid);
 839
 840                         if (domain_name != NULL) {
 841                                 /* This name was being found above in the case
 842                                  * when we found a domain SID */
 843                                 dom_infos[j].name =
 844                                         talloc_strdup(dom_infos, domain_name);
 845                                 if (dom_infos[j].name == NULL) {
 846                                         result = NT_STATUS_NO_MEMORY;
 847                                         goto fail;
 848                                 }
 849                         } else {
 850                                 /* lookup_rids will take care of this */
 851                                 dom_infos[j].name = NULL;
 852                         }
 853                 }
 854
 855                 name_infos[i].dom_idx = j;
 856
 857                 if (name_infos[i].type == SID_NAME_USE_NONE) {
 858                         name_infos[i].rid = rid;
 859
 860                         ADD_TO_ARRAY(dom_infos, int, i, &dom_infos[j].idxs,
 861                                      &dom_infos[j].num_idxs);
 862
 863                         if (dom_infos[j].idxs == NULL) {
 864                                 result = NT_STATUS_NO_MEMORY;
 865                                 goto fail;
 866                         }
 867                 }
 868         }
 869
 870         /* Iterate over the domains found */
 871
 872         for (i=0; i<MAX_REF_DOMAINS; i++) {
 873                 uint32_t *rids;
 874                 const char *domain_name = NULL;
 875                 const char **names;
 876                 enum lsa_SidType *types;
 877                 struct lsa_dom_info *dom = &dom_infos[i];
 878
 879                 if (!dom->valid) {
 880                         /* No domains left, we're done */
 881                         break;
 882                 }
 883
 884                 if (dom->num_idxs) {
 885                         if (!(rids = TALLOC_ARRAY(tmp_ctx, uint32, dom->num_idxs))) {
 886                                 result = NT_STATUS_NO_MEMORY;
 887                                 goto fail;
 888                         }
 889                 } else {
 890                         rids = NULL;
 891                 }
 892
 893                 for (j=0; j<dom->num_idxs; j++) {
 894                         rids[j] = name_infos[dom->idxs[j]].rid;
 895                 }
 896
 897                 if (!lookup_rids(tmp_ctx, &dom->sid,
 898                                  dom->num_idxs, rids, &domain_name,
 899                                  &names, &types)) {
 900                         result = NT_STATUS_NO_MEMORY;
 901                         goto fail;
 902                 }
 903
 904                 if (!(dom->name = talloc_strdup(dom_infos, domain_name))) {
 905                         result = NT_STATUS_NO_MEMORY;
 906                         goto fail;
 907                 }
 908
 909                 for (j=0; j<dom->num_idxs; j++) {
 910                         int idx = dom->idxs[j];
 911                         name_infos[idx].type = types[j];
 912                         if (types[j] != SID_NAME_UNKNOWN) {
 913                                 name_infos[idx].name =
 914                                         talloc_strdup(name_infos, names[j]);
 915                                 if (name_infos[idx].name == NULL) {
 916                                         result = NT_STATUS_NO_MEMORY;
 917                                         goto fail;
 918                                 }
 919                         } else {
 920                                 name_infos[idx].name = NULL;
 921                         }
 922                 }
 923         }
 924
 925         *ret_domains = dom_infos;
 926         *ret_names = name_infos;
 927         TALLOC_FREE(tmp_ctx);
 928         return NT_STATUS_OK;
 929
 930  fail:
 931         TALLOC_FREE(dom_infos);
 932         TALLOC_FREE(name_infos);
 933         TALLOC_FREE(tmp_ctx);
 934         return result;
 935 }
 936
 937 /*****************************************************************
 938  *THE CANONICAL* convert SID to name function.
 939 *****************************************************************/
 940
 941 bool lookup_sid(TALLOC_CTX *mem_ctx, const DOM_SID *sid,
 942                 const char **ret_domain, const char **ret_name,
 943                 enum lsa_SidType *ret_type)
 944 {
 945         struct lsa_dom_info *domain;
 946         struct lsa_name_info *name;
 947         TALLOC_CTX *tmp_ctx;
 948         bool ret = false;
 949
 950         DEBUG(10, ("lookup_sid called for SID '%s'\n", sid_string_dbg(sid)));
 951
 952         if (!(tmp_ctx = talloc_new(mem_ctx))) {
 953                 DEBUG(0, ("talloc_new failed\n"));
 954                 return false;
 955         }
 956
 957         if (!NT_STATUS_IS_OK(lookup_sids(tmp_ctx, 1, &sid, 1,
 958                                          &domain, &name))) {
 959                 goto done;
 960         }
 961
 962         if (name->type == SID_NAME_UNKNOWN) {
 963                 goto done;
 964         }
 965
 966         if ((ret_domain != NULL) &&
 967             !(*ret_domain = talloc_strdup(mem_ctx, domain->name))) {
 968                 goto done;
 969         }
 970
 971         if ((ret_name != NULL) &&
 972             !(*ret_name = talloc_strdup(mem_ctx, name->name))) {
 973                 goto done;
 974         }
 975
 976         if (ret_type != NULL) {
 977                 *ret_type = name->type;
 978         }
 979
 980         ret = true;
 981
 982  done:
 983         if (ret) {
 984                 DEBUG(10, ("Sid %s -> %s\\%s(%d)\n", sid_string_dbg(sid),
 985                            domain->name, name->name, name->type));
 986         } else {
 987                 DEBUG(10, ("failed to lookup sid %s\n", sid_string_dbg(sid)));
 988         }
 989         TALLOC_FREE(tmp_ctx);
 990         return ret;
 991 }
 992
 993 /*****************************************************************
 994  Id mapping cache.  This is to avoid Winbind mappings already
 995  seen by smbd to be queried too frequently, keeping winbindd
 996  busy, and blocking smbd while winbindd is busy with other
 997  stuff. Written by Michael Steffens <michael.steffens@hp.com>,
 998  modified to use linked lists by jra.
 999 *****************************************************************/
1000
1001 /*****************************************************************
1002   Find a SID given a uid.
1003 *****************************************************************/
1004
1005 static bool fetch_sid_from_uid_cache(DOM_SID *psid, uid_t uid)
1006 {
1007         DATA_BLOB cache_value;
1008
1009         if (!memcache_lookup(NULL, UID_SID_CACHE,
1010                              data_blob_const(&uid, sizeof(uid)),
1011                              &cache_value)) {
1012                 return false;
1013         }
1014
1015         SMB_ASSERT(cache_value.length == sizeof(*psid));
1016         memcpy(psid, cache_value.data, sizeof(*psid));
1017
1018         return true;
1019 }
1020
1021 /*****************************************************************
1022   Find a uid given a SID.
1023 *****************************************************************/
1024
1025 static bool fetch_uid_from_cache( uid_t *puid, const DOM_SID *psid )
1026 {
1027         DATA_BLOB cache_value;
1028
1029         if (!memcache_lookup(NULL, SID_UID_CACHE,
1030                              data_blob_const(psid, sizeof(*psid)),
1031                              &cache_value)) {
1032                 return false;
1033         }
1034
1035         SMB_ASSERT(cache_value.length == sizeof(*puid));
1036         memcpy(puid, cache_value.data, sizeof(*puid));
1037
1038         return true;
1039 }
1040
1041 /*****************************************************************
1042  Store uid to SID mapping in cache.
1043 *****************************************************************/
1044
1045 void store_uid_sid_cache(const DOM_SID *psid, uid_t uid)
1046 {
1047         memcache_add(NULL, SID_UID_CACHE,
1048                      data_blob_const(psid, sizeof(*psid)),
1049                      data_blob_const(&uid, sizeof(uid)));
1050         memcache_add(NULL, UID_SID_CACHE,
1051                      data_blob_const(&uid, sizeof(uid)),
1052                      data_blob_const(psid, sizeof(*psid)));
1053 }
1054
1055 /*****************************************************************
1056   Find a SID given a gid.
1057 *****************************************************************/
1058
1059 static bool fetch_sid_from_gid_cache(DOM_SID *psid, gid_t gid)
1060 {
1061         DATA_BLOB cache_value;
1062
1063         if (!memcache_lookup(NULL, GID_SID_CACHE,
1064                              data_blob_const(&gid, sizeof(gid)),
1065                              &cache_value)) {
1066                 return false;
1067         }
1068
1069         SMB_ASSERT(cache_value.length == sizeof(*psid));
1070         memcpy(psid, cache_value.data, sizeof(*psid));
1071
1072         return true;
1073 }
1074
1075 /*****************************************************************
1076   Find a gid given a SID.
1077 *****************************************************************/
1078
1079 static bool fetch_gid_from_cache(gid_t *pgid, const DOM_SID *psid)
1080 {
1081         DATA_BLOB cache_value;
1082
1083         if (!memcache_lookup(NULL, SID_UID_CACHE,
1084                              data_blob_const(psid, sizeof(*psid)),
1085                              &cache_value)) {
1086                 return false;
1087         }
1088
1089         SMB_ASSERT(cache_value.length == sizeof(*pgid));
1090         memcpy(pgid, cache_value.data, sizeof(*pgid));
1091
1092         return true;
1093 }
1094
1095 /*****************************************************************
1096  Store gid to SID mapping in cache.
1097 *****************************************************************/
1098
1099 void store_gid_sid_cache(const DOM_SID *psid, gid_t gid)
1100 {
1101         memcache_add(NULL, SID_GID_CACHE,
1102                      data_blob_const(psid, sizeof(*psid)),
1103                      data_blob_const(&gid, sizeof(gid)));
1104         memcache_add(NULL, GID_SID_CACHE,
1105                      data_blob_const(&gid, sizeof(gid)),
1106                      data_blob_const(psid, sizeof(*psid)));
1107 }
1108
1109 /*****************************************************************
1110  *THE LEGACY* convert uid_t to SID function.
1111 *****************************************************************/
1112
1113 static void legacy_uid_to_sid(DOM_SID *psid, uid_t uid)
1114 {
1115         uint32 rid;
1116         bool ret;
1117
1118         ZERO_STRUCTP(psid);
1119
1120         become_root();
1121         ret = pdb_uid_to_rid(uid, &rid);
1122         unbecome_root();
1123
1124         if (ret) {
1125                 /* This is a mapped user */
1126                 sid_copy(psid, get_global_sam_sid());
1127                 sid_append_rid(psid, rid);
1128                 goto done;
1129         }
1130
1131         /* This is an unmapped user */
1132
1133         uid_to_unix_users_sid(uid, psid);
1134
1135  done:
1136         DEBUG(10,("LEGACY: uid %u -> sid %s\n", (unsigned int)uid,
1137                   sid_string_dbg(psid)));
1138
1139         store_uid_sid_cache(psid, uid);
1140         return;
1141 }
1142
1143 /*****************************************************************
1144  *THE LEGACY* convert gid_t to SID function.
1145 *****************************************************************/
1146
1147 static void legacy_gid_to_sid(DOM_SID *psid, gid_t gid)
1148 {
1149         bool ret;
1150
1151         ZERO_STRUCTP(psid);
1152
1153         become_root();
1154         ret = pdb_gid_to_sid(gid, psid);
1155         unbecome_root();
1156
1157         if (ret) {
1158                 /* This is a mapped group */
1159                 goto done;
1160         }
1161
1162         /* This is an unmapped group */
1163
1164         gid_to_unix_groups_sid(gid, psid);
1165
1166  done:
1167         DEBUG(10,("LEGACY: gid %u -> sid %s\n", (unsigned int)gid,
1168                   sid_string_dbg(psid)));
1169
1170         store_gid_sid_cache(psid, gid);
1171         return;
1172 }
1173
1174 /*****************************************************************
1175  *THE LEGACY* convert SID to uid function.
1176 *****************************************************************/
1177
1178 static bool legacy_sid_to_uid(const DOM_SID *psid, uid_t *puid)
1179 {
1180         enum lsa_SidType type;
1181         uint32 rid;
1182
1183         if (sid_peek_check_rid(get_global_sam_sid(), psid, &rid)) {
1184                 union unid_t id;
1185                 bool ret;
1186
1187                 become_root();
1188                 ret = pdb_sid_to_id(psid, &id, &type);
1189                 unbecome_root();
1190
1191                 if (ret) {
1192                         if (type != SID_NAME_USER) {
1193                                 DEBUG(5, ("sid %s is a %s, expected a user\n",
1194                                           sid_string_dbg(psid),
1195                                           sid_type_lookup(type)));
1196                                 return false;
1197                         }
1198                         *puid = id.uid;
1199                         goto done;
1200                 }
1201
1202                 /* This was ours, but it was not mapped.  Fail */
1203         }
1204
1205         DEBUG(10,("LEGACY: mapping failed for sid %s\n",
1206                   sid_string_dbg(psid)));
1207         return false;
1208
1209 done:
1210         DEBUG(10,("LEGACY: sid %s -> uid %u\n", sid_string_dbg(psid),
1211                   (unsigned int)*puid ));
1212
1213         store_uid_sid_cache(psid, *puid);
1214         return true;
1215 }
1216
1217 /*****************************************************************
1218  *THE LEGACY* convert SID to gid function.
1219  Group mapping is used for gids that maps to Wellknown SIDs
1220 *****************************************************************/
1221
1222 static bool legacy_sid_to_gid(const DOM_SID *psid, gid_t *pgid)
1223 {
1224         uint32 rid;
1225         GROUP_MAP map;
1226         union unid_t id;
1227         enum lsa_SidType type;
1228
1229         if ((sid_check_is_in_builtin(psid) ||
1230              sid_check_is_in_wellknown_domain(psid))) {
1231                 bool ret;
1232
1233                 become_root();
1234                 ret = pdb_getgrsid(&map, *psid);
1235                 unbecome_root();
1236
1237                 if (ret) {
1238                         *pgid = map.gid;
1239                         goto done;
1240                 }
1241                 DEBUG(10,("LEGACY: mapping failed for sid %s\n",
1242                           sid_string_dbg(psid)));
1243                 return false;
1244         }
1245
1246         if (sid_peek_check_rid(get_global_sam_sid(), psid, &rid)) {
1247                 bool ret;
1248
1249                 become_root();
1250                 ret = pdb_sid_to_id(psid, &id, &type);
1251                 unbecome_root();
1252
1253                 if (ret) {
1254                         if ((type != SID_NAME_DOM_GRP) &&
1255                             (type != SID_NAME_ALIAS)) {
1256                                 DEBUG(5, ("LEGACY: sid %s is a %s, expected "
1257                                           "a group\n", sid_string_dbg(psid),
1258                                           sid_type_lookup(type)));
1259                                 return false;
1260                         }
1261                         *pgid = id.gid;
1262                         goto done;
1263                 }
1264
1265                 /* This was ours, but it was not mapped.  Fail */
1266         }
1267
1268         DEBUG(10,("LEGACY: mapping failed for sid %s\n",
1269                   sid_string_dbg(psid)));
1270         return false;
1271
1272  done:
1273         DEBUG(10,("LEGACY: sid %s -> gid %u\n", sid_string_dbg(psid),
1274                   (unsigned int)*pgid ));
1275
1276         store_gid_sid_cache(psid, *pgid);
1277
1278         return true;
1279 }
1280
1281 /*****************************************************************
1282  *THE CANONICAL* convert uid_t to SID function.
1283 *****************************************************************/
1284
1285 void uid_to_sid(DOM_SID *psid, uid_t uid)
1286 {
1287         ZERO_STRUCTP(psid);
1288
1289         if (fetch_sid_from_uid_cache(psid, uid))
1290                 return;
1291
1292         if (!winbind_uid_to_sid(psid, uid)) {
1293                 if (!winbind_ping()) {
1294                         legacy_uid_to_sid(psid, uid);
1295                         return;
1296                 }
1297
1298                 DEBUG(5, ("uid_to_sid: winbind failed to find a sid for uid %u\n",
1299                         uid));
1300                 return;
1301         }
1302
1303         DEBUG(10,("uid %u -> sid %s\n", (unsigned int)uid,
1304                   sid_string_dbg(psid)));
1305
1306         store_uid_sid_cache(psid, uid);
1307         return;
1308 }
1309
1310 /*****************************************************************
1311  *THE CANONICAL* convert gid_t to SID function.
1312 *****************************************************************/
1313
1314 void gid_to_sid(DOM_SID *psid, gid_t gid)
1315 {
1316         ZERO_STRUCTP(psid);
1317
1318         if (fetch_sid_from_gid_cache(psid, gid))
1319                 return;
1320
1321         if (!winbind_gid_to_sid(psid, gid)) {
1322                 if (!winbind_ping()) {
1323                         legacy_gid_to_sid(psid, gid);
1324                         return;
1325                 }
1326
1327                 DEBUG(5, ("gid_to_sid: winbind failed to find a sid for gid %u\n",
1328                         gid));
1329                 return;
1330         }
1331
1332         DEBUG(10,("gid %u -> sid %s\n", (unsigned int)gid,
1333                   sid_string_dbg(psid)));
1334
1335         store_gid_sid_cache(psid, gid);
1336         return;
1337 }
1338
1339 /*****************************************************************
1340  *THE CANONICAL* convert SID to uid function.
1341 *****************************************************************/
1342
1343 bool sid_to_uid(const DOM_SID *psid, uid_t *puid)
1344 {
1345         uint32 rid;
1346         gid_t gid;
1347
1348         if (fetch_uid_from_cache(puid, psid))
1349                 return true;
1350
1351         if (fetch_gid_from_cache(&gid, psid)) {
1352                 return false;
1353         }
1354
1355         /* Optimize for the Unix Users Domain
1356          * as the conversion is straightforward */
1357         if (sid_peek_check_rid(&global_sid_Unix_Users, psid, &rid)) {
1358                 uid_t uid = rid;
1359                 *puid = uid;
1360
1361                 /* return here, don't cache */
1362                 DEBUG(10,("sid %s -> uid %u\n", sid_string_dbg(psid),
1363                         (unsigned int)*puid ));
1364                 return true;
1365         }
1366
1367         if (!winbind_sid_to_uid(puid, psid)) {
1368                 if (!winbind_ping()) {
1369                         return legacy_sid_to_uid(psid, puid);
1370                 }
1371
1372                 DEBUG(5, ("winbind failed to find a uid for sid %s\n",
1373                           sid_string_dbg(psid)));
1374                 return false;
1375         }
1376
1377         /* TODO: Here would be the place to allocate both a gid and a uid for
1378          * the SID in question */
1379
1380         DEBUG(10,("sid %s -> uid %u\n", sid_string_dbg(psid),
1381                 (unsigned int)*puid ));
1382
1383         store_uid_sid_cache(psid, *puid);
1384         return true;
1385 }
1386
1387 /*****************************************************************
1388  *THE CANONICAL* convert SID to gid function.
1389  Group mapping is used for gids that maps to Wellknown SIDs
1390 *****************************************************************/
1391
1392 bool sid_to_gid(const DOM_SID *psid, gid_t *pgid)
1393 {
1394         uint32 rid;
1395         uid_t uid;
1396
1397         if (fetch_gid_from_cache(pgid, psid))
1398                 return true;
1399
1400         if (fetch_uid_from_cache(&uid, psid))
1401                 return false;
1402
1403         /* Optimize for the Unix Groups Domain
1404          * as the conversion is straightforward */
1405         if (sid_peek_check_rid(&global_sid_Unix_Groups, psid, &rid)) {
1406                 gid_t gid = rid;
1407                 *pgid = gid;
1408
1409                 /* return here, don't cache */
1410                 DEBUG(10,("sid %s -> gid %u\n", sid_string_dbg(psid),
1411                         (unsigned int)*pgid ));
1412                 return true;
1413         }
1414
1415         /* Ask winbindd if it can map this sid to a gid.
1416          * (Idmap will check it is a valid SID and of the right type) */
1417
1418         if ( !winbind_sid_to_gid(pgid, psid) ) {
1419                 if (!winbind_ping()) {
1420                         return legacy_sid_to_gid(psid, pgid);
1421                 }
1422
1423                 DEBUG(10,("winbind failed to find a gid for sid %s\n",
1424                           sid_string_dbg(psid)));
1425                 return false;
1426         }
1427
1428         DEBUG(10,("sid %s -> gid %u\n", sid_string_dbg(psid),
1429                   (unsigned int)*pgid ));
1430
1431         store_gid_sid_cache(psid, *pgid);
1432
1433         return true;
1434 }
1435