source3/winbindd/idmap.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    ID Mapping
   4    Copyright (C) Tim Potter 2000
   5    Copyright (C) Jim McDonough <jmcd@us.ibm.com>        2003
   6    Copyright (C) Simo Sorce 2003-2007
   7    Copyright (C) Jeremy Allison 2006
   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 3 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, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "winbindd.h"
  25
  26 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_IDMAP
  28
  29 static_decl_idmap;
  30
  31 /**
  32  * Pointer to the backend methods. Modules register themselves here via
  33  * smb_register_idmap.
  34  */
  35
  36 struct idmap_backend {
  37         const char *name;
  38         struct idmap_methods *methods;
  39         struct idmap_backend *prev, *next;
  40 };
  41 static struct idmap_backend *backends = NULL;
  42
  43 /**
  44  * Pointer to the alloc backend methods. Modules register themselves here via
  45  * smb_register_idmap_alloc.
  46  */
  47 struct idmap_alloc_backend {
  48         const char *name;
  49         struct idmap_alloc_methods *methods;
  50         struct idmap_alloc_backend *prev, *next;
  51 };
  52 static struct idmap_alloc_backend *alloc_backends = NULL;
  53
  54 /**
  55  * The idmap alloc context that is configured via "idmap alloc
  56  * backend". Defaults to "idmap backend" in case the module (tdb, ldap) also
  57  * provides alloc methods.
  58  */
  59 struct idmap_alloc_context {
  60         struct idmap_alloc_methods *methods;
  61 };
  62 static struct idmap_alloc_context *idmap_alloc_ctx = NULL;
  63
  64 /**
  65  * Default idmap domain configured via "idmap backend".
  66  */
  67 static struct idmap_domain *default_idmap_domain;
  68
  69 /**
  70  * Passdb idmap domain, not configurable. winbind must always give passdb a
  71  * chance to map ids.
  72  */
  73 static struct idmap_domain *passdb_idmap_domain;
  74
  75 /**
  76  * List of specially configured idmap domains. This list is filled on demand
  77  * in the winbind idmap child when the parent winbind figures out via the
  78  * special range parameter or via the domain SID that a special "idmap config
  79  * domain" configuration is present.
  80  */
  81 static struct idmap_domain **idmap_domains = NULL;
  82 static int num_domains = 0;
  83
  84 static struct idmap_methods *get_methods(const char *name)
  85 {
  86         struct idmap_backend *b;
  87
  88         for (b = backends; b; b = b->next) {
  89                 if (strequal(b->name, name)) {
  90                         return b->methods;
  91                 }
  92         }
  93
  94         return NULL;
  95 }
  96
  97 static struct idmap_alloc_methods *get_alloc_methods(const char *name)
  98 {
  99         struct idmap_alloc_backend *b;
 100
 101         for (b = alloc_backends; b; b = b->next) {
 102                 if (strequal(b->name, name)) {
 103                         return b->methods;
 104                 }
 105         }
 106
 107         return NULL;
 108 }
 109
 110 bool idmap_is_offline(void)
 111 {
 112         return ( lp_winbind_offline_logon() &&
 113              get_global_winbindd_state_offline() );
 114 }
 115
 116 bool idmap_is_online(void)
 117 {
 118         return !idmap_is_offline();
 119 }
 120
 121 /**********************************************************************
 122  Allow a module to register itself as a method.
 123 **********************************************************************/
 124
 125 NTSTATUS smb_register_idmap(int version, const char *name,
 126                             struct idmap_methods *methods)
 127 {
 128         struct idmap_backend *entry;
 129
 130         if ((version != SMB_IDMAP_INTERFACE_VERSION)) {
 131                 DEBUG(0, ("Failed to register idmap module.\n"
 132                           "The module was compiled against "
 133                           "SMB_IDMAP_INTERFACE_VERSION %d,\n"
 134                           "current SMB_IDMAP_INTERFACE_VERSION is %d.\n"
 135                           "Please recompile against the current version "
 136                           "of samba!\n",
 137                           version, SMB_IDMAP_INTERFACE_VERSION));
 138                 return NT_STATUS_OBJECT_TYPE_MISMATCH;
 139         }
 140
 141         if (!name || !name[0] || !methods) {
 142                 DEBUG(0,("Called with NULL pointer or empty name!\n"));
 143                 return NT_STATUS_INVALID_PARAMETER;
 144         }
 145
 146         for (entry = backends; entry != NULL; entry = entry->next) {
 147                 if (strequal(entry->name, name)) {
 148                         DEBUG(0,("Idmap module %s already registered!\n",
 149                                  name));
 150                         return NT_STATUS_OBJECT_NAME_COLLISION;
 151                 }
 152         }
 153
 154         entry = talloc(NULL, struct idmap_backend);
 155         if ( ! entry) {
 156                 DEBUG(0,("Out of memory!\n"));
 157                 TALLOC_FREE(entry);
 158                 return NT_STATUS_NO_MEMORY;
 159         }
 160         entry->name = talloc_strdup(entry, name);
 161         if ( ! entry->name) {
 162                 DEBUG(0,("Out of memory!\n"));
 163                 TALLOC_FREE(entry);
 164                 return NT_STATUS_NO_MEMORY;
 165         }
 166         entry->methods = methods;
 167
 168         DLIST_ADD(backends, entry);
 169         DEBUG(5, ("Successfully added idmap backend '%s'\n", name));
 170         return NT_STATUS_OK;
 171 }
 172
 173 /**********************************************************************
 174  Allow a module to register itself as an alloc method.
 175 **********************************************************************/
 176
 177 NTSTATUS smb_register_idmap_alloc(int version, const char *name,
 178                                   struct idmap_alloc_methods *methods)
 179 {
 180         struct idmap_alloc_methods *test;
 181         struct idmap_alloc_backend *entry;
 182
 183         if ((version != SMB_IDMAP_INTERFACE_VERSION)) {
 184                 DEBUG(0, ("Failed to register idmap alloc module.\n"
 185                           "The module was compiled against "
 186                           "SMB_IDMAP_INTERFACE_VERSION %d,\n"
 187                           "current SMB_IDMAP_INTERFACE_VERSION is %d.\n"
 188                           "Please recompile against the current version "
 189                           "of samba!\n",
 190                           version, SMB_IDMAP_INTERFACE_VERSION));
 191                 return NT_STATUS_OBJECT_TYPE_MISMATCH;
 192         }
 193
 194         if (!name || !name[0] || !methods) {
 195                 DEBUG(0,("Called with NULL pointer or empty name!\n"));
 196                 return NT_STATUS_INVALID_PARAMETER;
 197         }
 198
 199         test = get_alloc_methods(name);
 200         if (test) {
 201                 DEBUG(0,("idmap_alloc module %s already registered!\n", name));
 202                 return NT_STATUS_OBJECT_NAME_COLLISION;
 203         }
 204
 205         entry = talloc(NULL, struct idmap_alloc_backend);
 206         if ( ! entry) {
 207                 DEBUG(0,("Out of memory!\n"));
 208                 return NT_STATUS_NO_MEMORY;
 209         }
 210         entry->name = talloc_strdup(entry, name);
 211         if ( ! entry->name) {
 212                 DEBUG(0,("Out of memory!\n"));
 213                 return NT_STATUS_NO_MEMORY;
 214         }
 215         entry->methods = methods;
 216
 217         DLIST_ADD(alloc_backends, entry);
 218         DEBUG(5, ("Successfully added idmap alloc backend '%s'\n", name));
 219         return NT_STATUS_OK;
 220 }
 221
 222 static int close_domain_destructor(struct idmap_domain *dom)
 223 {
 224         NTSTATUS ret;
 225
 226         ret = dom->methods->close_fn(dom);
 227         if (!NT_STATUS_IS_OK(ret)) {
 228                 DEBUG(3, ("Failed to close idmap domain [%s]!\n", dom->name));
 229         }
 230
 231         return 0;
 232 }
 233
 234 static bool parse_idmap_module(TALLOC_CTX *mem_ctx, const char *param,
 235                                char **pmodulename, char **pargs)
 236 {
 237         char *modulename;
 238         char *args;
 239
 240         if (strncmp(param, "idmap_", 6) == 0) {
 241                 param += 6;
 242                 DEBUG(1, ("idmap_init: idmap backend uses deprecated "
 243                           "'idmap_' prefix.  Please replace 'idmap_%s' by "
 244                           "'%s'\n", param, param));
 245         }
 246
 247         modulename = talloc_strdup(mem_ctx, param);
 248         if (modulename == NULL) {
 249                 return false;
 250         }
 251
 252         args = strchr(modulename, ':');
 253         if (args == NULL) {
 254                 *pmodulename = modulename;
 255                 *pargs = NULL;
 256                 return true;
 257         }
 258
 259         *args = '\0';
 260
 261         args = talloc_strdup(mem_ctx, args+1);
 262         if (args == NULL) {
 263                 TALLOC_FREE(modulename);
 264                 return false;
 265         }
 266
 267         *pmodulename = modulename;
 268         *pargs = args;
 269         return true;
 270 }
 271
 272 /**
 273  * Initialize a domain structure
 274  * @param[in] mem_ctx           memory context for the result
 275  * @param[in] domainname        which domain is this for
 276  * @param[in] modulename        which backend module
 277  * @param[in] params            parameter to pass to the init function
 278  * @result The initialized structure
 279  */
 280 static struct idmap_domain *idmap_init_domain(TALLOC_CTX *mem_ctx,
 281                                               const char *domainname,
 282                                               const char *modulename,
 283                                               const char *params)
 284 {
 285         struct idmap_domain *result;
 286         NTSTATUS status;
 287
 288         result = talloc_zero(mem_ctx, struct idmap_domain);
 289         if (result == NULL) {
 290                 DEBUG(0, ("talloc failed\n"));
 291                 return NULL;
 292         }
 293
 294         result->name = talloc_strdup(result, domainname);
 295         if (result->name == NULL) {
 296                 DEBUG(0, ("talloc failed\n"));
 297                 goto fail;
 298         }
 299
 300         result->methods = get_methods(modulename);
 301         if (result->methods == NULL) {
 302                 DEBUG(3, ("idmap backend %s not found\n", modulename));
 303
 304                 status = smb_probe_module("idmap", modulename);
 305                 if (!NT_STATUS_IS_OK(status)) {
 306                         DEBUG(3, ("Could not probe idmap module %s\n",
 307                                   modulename));
 308                         goto fail;
 309                 }
 310
 311                 result->methods = get_methods(modulename);
 312         }
 313         if (result->methods == NULL) {
 314                 DEBUG(1, ("idmap backend %s not found\n", modulename));
 315                 goto fail;
 316         }
 317
 318         status = result->methods->init(result, params);
 319         if (!NT_STATUS_IS_OK(status)) {
 320                 DEBUG(1, ("idmap initialization returned %s\n",
 321                           nt_errstr(status)));
 322                 goto fail;
 323         }
 324
 325         talloc_set_destructor(result, close_domain_destructor);
 326
 327         return result;
 328
 329 fail:
 330         TALLOC_FREE(result);
 331         return NULL;
 332 }
 333
 334 /**
 335  * Initialize the default domain structure
 336  * @param[in] mem_ctx           memory context for the result
 337  * @result The default domain structure
 338  *
 339  * This routine takes the module name from the "idmap backend" parameter,
 340  * passing a possible parameter like ldap:ldap://ldap-url/ to the module.
 341  */
 342
 343 static struct idmap_domain *idmap_init_default_domain(TALLOC_CTX *mem_ctx)
 344 {
 345         struct idmap_domain *result;
 346         char *modulename;
 347         char *params;
 348
 349         DEBUG(10, ("idmap_init_default_domain: calling static_init_idmap\n"));
 350
 351         static_init_idmap;
 352
 353         if (!parse_idmap_module(talloc_tos(), lp_idmap_backend(), &modulename,
 354                                 &params)) {
 355                 DEBUG(1, ("parse_idmap_module failed\n"));
 356                 return NULL;
 357         }
 358
 359         DEBUG(3, ("idmap_init: using '%s' as remote backend\n", modulename));
 360
 361         result = idmap_init_domain(mem_ctx, "*", modulename, params);
 362         if (result == NULL) {
 363                 goto fail;
 364         }
 365
 366         TALLOC_FREE(modulename);
 367         TALLOC_FREE(params);
 368         return result;
 369
 370 fail:
 371         TALLOC_FREE(modulename);
 372         TALLOC_FREE(params);
 373         TALLOC_FREE(result);
 374         return NULL;
 375 }
 376
 377 /**
 378  * Initialize a named domain structure
 379  * @param[in] mem_ctx           memory context for the result
 380  * @param[in] domname           the domain name
 381  * @result The default domain structure
 382  *
 383  * This routine looks at the "idmap config <domname>" parameters to figure out
 384  * the configuration.
 385  */
 386
 387 static struct idmap_domain *idmap_init_named_domain(TALLOC_CTX *mem_ctx,
 388                                                     const char *domname)
 389 {
 390         struct idmap_domain *result = NULL;
 391         char *config_option;
 392         const char *backend;
 393
 394         config_option = talloc_asprintf(talloc_tos(), "idmap config %s",
 395                                         domname);
 396         if (config_option == NULL) {
 397                 DEBUG(0, ("talloc failed\n"));
 398                 goto fail;
 399         }
 400
 401         backend = lp_parm_const_string(-1, config_option, "backend", NULL);
 402         if (backend == NULL) {
 403                 DEBUG(1, ("no backend defined for %s\n", config_option));
 404                 goto fail;
 405         }
 406
 407         result = idmap_init_domain(mem_ctx, domname, backend, NULL);
 408         if (result == NULL) {
 409                 goto fail;
 410         }
 411
 412         TALLOC_FREE(config_option);
 413         return result;
 414
 415 fail:
 416         TALLOC_FREE(config_option);
 417         TALLOC_FREE(result);
 418         return NULL;
 419 }
 420
 421 /**
 422  * Initialize the passdb domain structure
 423  * @param[in] mem_ctx           memory context for the result
 424  * @result The default domain structure
 425  *
 426  * No config, passdb has its own configuration.
 427  */
 428
 429 static struct idmap_domain *idmap_init_passdb_domain(TALLOC_CTX *mem_ctx)
 430 {
 431         if (passdb_idmap_domain != NULL) {
 432                 return passdb_idmap_domain;
 433         }
 434
 435         passdb_idmap_domain = idmap_init_domain(NULL, get_global_sam_name(),
 436                                                 "passdb", NULL);
 437         if (passdb_idmap_domain == NULL) {
 438                 DEBUG(1, ("Could not init passdb idmap domain\n"));
 439         }
 440
 441         return passdb_idmap_domain;
 442 }
 443
 444 /**
 445  * Find a domain struct according to a domain name
 446  * @param[in] domname           Domain name to get the config for
 447  * @result The default domain structure that fits
 448  *
 449  * This is the central routine in the winbindd-idmap child to pick the correct
 450  * domain for looking up IDs. If domname is NULL or empty, we use the default
 451  * domain. If it contains something, we try to use idmap_init_named_domain()
 452  * to fetch the correct backend.
 453  *
 454  * The choice about "domname" is being made by the winbind parent, look at the
 455  * "have_idmap_config" of "struct winbindd_domain" which is set in
 456  * add_trusted_domain.
 457  */
 458
 459 static struct idmap_domain *idmap_find_domain(const char *domname)
 460 {
 461         struct idmap_domain *result;
 462         int i;
 463
 464         /*
 465          * Always init the default domain, we can't go without one
 466          */
 467         if (default_idmap_domain == NULL) {
 468                 default_idmap_domain = idmap_init_default_domain(NULL);
 469         }
 470         if (default_idmap_domain == NULL) {
 471                 return NULL;
 472         }
 473
 474         if ((domname == NULL) || (domname[0] == '\0')) {
 475                 return default_idmap_domain;
 476         }
 477
 478         for (i=0; i<num_domains; i++) {
 479                 if (strequal(idmap_domains[i]->name, domname)) {
 480                         return idmap_domains[i];
 481                 }
 482         }
 483
 484         if (idmap_domains == NULL) {
 485                 /*
 486                  * talloc context for all idmap domains
 487                  */
 488                 idmap_domains = TALLOC_ARRAY(NULL, struct idmap_domain *, 1);
 489         }
 490
 491         if (idmap_domains == NULL) {
 492                 DEBUG(0, ("talloc failed\n"));
 493                 return NULL;
 494         }
 495
 496         result = idmap_init_named_domain(idmap_domains, domname);
 497         if (result == NULL) {
 498                 /*
 499                  * Could not init that domain -- try the default one
 500                  */
 501                 return default_idmap_domain;
 502         }
 503
 504         ADD_TO_ARRAY(idmap_domains, struct idmap_domain *, result,
 505                      &idmap_domains, &num_domains);
 506         return result;
 507 }
 508
 509 void idmap_close(void)
 510 {
 511         if (idmap_alloc_ctx) {
 512                 idmap_alloc_ctx->methods->close_fn();
 513                 idmap_alloc_ctx->methods = NULL;
 514         }
 515         alloc_backends = NULL;
 516         TALLOC_FREE(default_idmap_domain);
 517         TALLOC_FREE(passdb_idmap_domain);
 518         TALLOC_FREE(idmap_domains);
 519         num_domains = 0;
 520 }
 521
 522 /**
 523  * Initialize the idmap alloc backend
 524  * @param[out] ctx              Where to put the alloc_ctx?
 525  * @result Did it work fine?
 526  *
 527  * This routine first looks at "idmap alloc backend" and if that is not
 528  * defined, it uses "idmap backend" for the module name.
 529  */
 530 static NTSTATUS idmap_alloc_init(struct idmap_alloc_context **ctx)
 531 {
 532         const char *backend;
 533         char *modulename, *params;
 534         NTSTATUS ret = NT_STATUS_NO_MEMORY;;
 535
 536         if (idmap_alloc_ctx != NULL) {
 537                 *ctx = idmap_alloc_ctx;
 538                 return NT_STATUS_OK;
 539         }
 540
 541         idmap_alloc_ctx = talloc(NULL, struct idmap_alloc_context);
 542         if (idmap_alloc_ctx == NULL) {
 543                 DEBUG(0, ("talloc failed\n"));
 544                 goto fail;
 545         }
 546
 547         backend = lp_idmap_alloc_backend();
 548         if ((backend == NULL) || (backend[0] == '\0')) {
 549                 backend = lp_idmap_backend();
 550         }
 551
 552         if (backend == NULL) {
 553                 DEBUG(3, ("no idmap alloc backend defined\n"));
 554                 ret = NT_STATUS_INVALID_PARAMETER;
 555                 goto fail;
 556         }
 557
 558         if (!parse_idmap_module(idmap_alloc_ctx, backend, &modulename,
 559                                 &params)) {
 560                 DEBUG(1, ("parse_idmap_module %s failed\n", backend));
 561                 goto fail;
 562         }
 563
 564         idmap_alloc_ctx->methods = get_alloc_methods(modulename);
 565
 566         if (idmap_alloc_ctx->methods == NULL) {
 567                 ret = smb_probe_module("idmap", modulename);
 568                 if (NT_STATUS_IS_OK(ret)) {
 569                         idmap_alloc_ctx->methods =
 570                                 get_alloc_methods(modulename);
 571                 }
 572         }
 573
 574         if (idmap_alloc_ctx->methods == NULL) {
 575                 DEBUG(1, ("could not find idmap alloc module %s\n", backend));
 576                 ret = NT_STATUS_INVALID_PARAMETER;
 577                 goto fail;
 578         }
 579
 580         ret = idmap_alloc_ctx->methods->init(params);
 581
 582         if (!NT_STATUS_IS_OK(ret)) {
 583                 DEBUG(0, ("ERROR: Initialization failed for alloc "
 584                           "backend, deferred!\n"));
 585                 goto fail;
 586         }
 587
 588         TALLOC_FREE(modulename);
 589         TALLOC_FREE(params);
 590
 591         *ctx = idmap_alloc_ctx;
 592         return NT_STATUS_OK;
 593
 594 fail:
 595         TALLOC_FREE(idmap_alloc_ctx);
 596         return ret;
 597 }
 598
 599 /**************************************************************************
 600  idmap allocator interface functions
 601 **************************************************************************/
 602
 603 NTSTATUS idmap_allocate_uid(struct unixid *id)
 604 {
 605         struct idmap_alloc_context *ctx;
 606         NTSTATUS ret;
 607
 608         if (!NT_STATUS_IS_OK(ret = idmap_alloc_init(&ctx))) {
 609                 return ret;
 610         }
 611
 612         id->type = ID_TYPE_UID;
 613         return ctx->methods->allocate_id(id);
 614 }
 615
 616 NTSTATUS idmap_allocate_gid(struct unixid *id)
 617 {
 618         struct idmap_alloc_context *ctx;
 619         NTSTATUS ret;
 620
 621         if (!NT_STATUS_IS_OK(ret = idmap_alloc_init(&ctx))) {
 622                 return ret;
 623         }
 624
 625         id->type = ID_TYPE_GID;
 626         return ctx->methods->allocate_id(id);
 627 }
 628
 629 NTSTATUS idmap_set_uid_hwm(struct unixid *id)
 630 {
 631         struct idmap_alloc_context *ctx;
 632         NTSTATUS ret;
 633
 634         if (!NT_STATUS_IS_OK(ret = idmap_alloc_init(&ctx))) {
 635                 return ret;
 636         }
 637
 638         id->type = ID_TYPE_UID;
 639         return ctx->methods->set_id_hwm(id);
 640 }
 641
 642 NTSTATUS idmap_set_gid_hwm(struct unixid *id)
 643 {
 644         struct idmap_alloc_context *ctx;
 645         NTSTATUS ret;
 646
 647         if (!NT_STATUS_IS_OK(ret = idmap_alloc_init(&ctx))) {
 648                 return ret;
 649         }
 650
 651         id->type = ID_TYPE_GID;
 652         return ctx->methods->set_id_hwm(id);
 653 }
 654
 655 NTSTATUS idmap_new_mapping(const struct dom_sid *psid, enum id_type type,
 656                            struct unixid *pxid)
 657 {
 658         struct dom_sid sid;
 659         struct idmap_domain *dom;
 660         struct id_map map;
 661         NTSTATUS status;
 662
 663         dom = idmap_find_domain(NULL);
 664         if (dom == NULL) {
 665                 DEBUG(3, ("no default domain, no place to write\n"));
 666                 return NT_STATUS_ACCESS_DENIED;
 667         }
 668         if (dom->methods->set_mapping == NULL) {
 669                 DEBUG(3, ("default domain not writable\n"));
 670                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
 671         }
 672
 673         sid_copy(&sid, psid);
 674         map.sid = &sid;
 675         map.xid.type = type;
 676
 677         switch (type) {
 678         case ID_TYPE_UID:
 679                 status = idmap_allocate_uid(&map.xid);
 680                 break;
 681         case ID_TYPE_GID:
 682                 status = idmap_allocate_gid(&map.xid);
 683                 break;
 684         default:
 685                 status = NT_STATUS_INVALID_PARAMETER;
 686                 break;
 687         }
 688
 689         if (!NT_STATUS_IS_OK(status)) {
 690                 DEBUG(3, ("Could not allocate id: %s\n", nt_errstr(status)));
 691                 return status;
 692         }
 693
 694         map.status = ID_MAPPED;
 695
 696         DEBUG(10, ("Setting mapping: %s <-> %s %lu\n",
 697                    sid_string_dbg(map.sid),
 698                    (map.xid.type == ID_TYPE_UID) ? "UID" : "GID",
 699                    (unsigned long)map.xid.id));
 700
 701         status = dom->methods->set_mapping(dom, &map);
 702
 703         if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_COLLISION)) {
 704                 struct id_map *ids[2];
 705                 DEBUG(5, ("Mapping for %s exists - retrying to map sid\n",
 706                           sid_string_dbg(map.sid)));
 707                 ids[0] = &map;
 708                 ids[1] = NULL;
 709                 status = dom->methods->sids_to_unixids(dom, ids);
 710         }
 711
 712         if (!NT_STATUS_IS_OK(status)) {
 713                 DEBUG(3, ("Could not store the new mapping: %s\n",
 714                           nt_errstr(status)));
 715                 return status;
 716         }
 717
 718         *pxid = map.xid;
 719
 720         return NT_STATUS_OK;
 721 }
 722
 723 NTSTATUS idmap_backends_unixid_to_sid(const char *domname, struct id_map *id)
 724 {
 725         struct idmap_domain *dom;
 726         struct id_map *maps[2];
 727
 728         maps[0] = id;
 729         maps[1] = NULL;
 730
 731         /*
 732          * Always give passdb a chance first
 733          */
 734
 735         dom = idmap_init_passdb_domain(NULL);
 736         if ((dom != NULL)
 737             && NT_STATUS_IS_OK(dom->methods->unixids_to_sids(dom, maps))) {
 738                 return NT_STATUS_OK;
 739         }
 740
 741         dom = idmap_find_domain(domname);
 742         if (dom == NULL) {
 743                 return NT_STATUS_NONE_MAPPED;
 744         }
 745
 746         return dom->methods->unixids_to_sids(dom, maps);
 747 }
 748
 749 NTSTATUS idmap_backends_sid_to_unixid(const char *domain, struct id_map *id)
 750 {
 751         struct idmap_domain *dom;
 752         struct id_map *maps[2];
 753
 754         maps[0] = id;
 755         maps[1] = NULL;
 756
 757         if (sid_check_is_in_builtin(id->sid)
 758             || (sid_check_is_in_our_domain(id->sid))) {
 759
 760                 dom = idmap_init_passdb_domain(NULL);
 761                 if (dom == NULL) {
 762                         return NT_STATUS_NONE_MAPPED;
 763                 }
 764                 return dom->methods->sids_to_unixids(dom, maps);
 765         }
 766
 767         dom = idmap_find_domain(domain);
 768         if (dom == NULL) {
 769                 return NT_STATUS_NONE_MAPPED;
 770         }
 771
 772         return dom->methods->sids_to_unixids(dom, maps);
 773 }
 774
 775 NTSTATUS idmap_set_mapping(const struct id_map *map)
 776 {
 777         struct idmap_domain *dom;
 778
 779         dom = idmap_find_domain(NULL);
 780         if (dom == NULL) {
 781                 DEBUG(3, ("no default domain, no place to write\n"));
 782                 return NT_STATUS_ACCESS_DENIED;
 783         }
 784         if (dom->methods->set_mapping == NULL) {
 785                 DEBUG(3, ("default domain not writable\n"));
 786                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
 787         }
 788
 789         return dom->methods->set_mapping(dom, map);
 790 }
 791
 792 NTSTATUS idmap_remove_mapping(const struct id_map *map)
 793 {
 794         struct idmap_domain *dom;
 795
 796         dom = idmap_find_domain(NULL);
 797         if (dom == NULL) {
 798                 DEBUG(3, ("no default domain, no place to write\n"));
 799                 return NT_STATUS_ACCESS_DENIED;
 800         }
 801         if (dom->methods->remove_mapping == NULL) {
 802                 DEBUG(3, ("default domain not writable\n"));
 803                 return NT_STATUS_MEDIA_WRITE_PROTECTED;
 804         }
 805
 806         return dom->methods->remove_mapping(dom, map);
 807 }