source/groupdb/mapping_ldb.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *
   4  *  group mapping code on top of ldb
   5  *
   6  *  Copyright (C) Andrew Tridgell              2006
   7  *
   8  * based on tdb group mapping code from groupdb/mapping.c
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, write to the Free Software
  22  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #include "includes.h"
  26 #include "groupdb/mapping.h"
  27 #include "lib/ldb/include/includes.h"
  28 #include "lib/ldb/include/ldb_errors.h"
  29
  30 static struct ldb_context *ldb;
  31
  32 static BOOL mapping_upgrade(const char *tdb_path);
  33
  34 /*
  35   connect to the group mapping ldb
  36 */
  37 static BOOL init_group_mapping(void)
  38 {
  39         BOOL existed;
  40         const char *init_ldif[] =
  41                 { "dn: @ATTRIBUTES\n" \
  42                   "ntName: CASE_INSENSITIVE\n" \
  43                   "\n",
  44                   "dn: @INDEXLIST\n" \
  45                   "@IDXATTR: gidNumber\n" \
  46                   "@IDXATTR: ntName\n" \
  47                   "@IDXATTR: member\n" };
  48         const char *db_path, *tdb_path;
  49         int ret;
  50         int flags = 0;
  51
  52         if (ldb != NULL) {
  53                 return True;
  54         }
  55
  56         /* this is needed as Samba3 doesn't have this globally yet */
  57         ldb_global_init();
  58
  59         db_path = lock_path("group_mapping.ldb");
  60
  61         ldb = ldb_init(NULL);
  62         if (ldb == NULL) goto failed;
  63
  64         existed = file_exist(db_path, NULL);
  65
  66         if (lp_parm_bool(-1, "groupmap", "nosync", False)) {
  67                 flags |= LDB_FLG_NOSYNC;
  68         }
  69
  70         if (!lp_use_mmap()) {
  71                 flags |= LDB_FLG_NOMMAP;
  72         }
  73
  74         ret = ldb_connect(ldb, db_path, flags, NULL);
  75         if (ret != LDB_SUCCESS) {
  76                 goto failed;
  77         }
  78
  79         if (!existed) {
  80                 /* initialise the ldb with an index */
  81                 struct ldb_ldif *ldif;
  82                 int i;
  83                 for (i=0;i<ARRAY_SIZE(init_ldif);i++) {
  84                         ldif = ldb_ldif_read_string(ldb, &init_ldif[i]);
  85                         if (ldif == NULL) goto failed;
  86                         ret = ldb_add(ldb, ldif->msg);
  87                         talloc_free(ldif);
  88                         if (ret == -1) goto failed;
  89                 }
  90         }
  91
  92         /* possibly upgrade */
  93         tdb_path = lock_path("group_mapping.tdb");
  94         if (file_exist(tdb_path, NULL) && !mapping_upgrade(tdb_path)) {
  95                 unlink(lock_path("group_mapping.ldb"));
  96                 goto failed;
  97         }
  98
  99         return True;
 100
 101 failed:
 102         DEBUG(0,("Failed to open group mapping ldb '%s' - '%s'\n",
 103                  db_path, ldb?ldb_errstring(ldb):strerror(errno)));
 104         talloc_free(ldb);
 105         ldb = NULL;
 106         return False;
 107 }
 108
 109
 110 /*
 111   form the DN for a mapping entry from a SID
 112  */
 113 static struct ldb_dn *mapping_dn(TALLOC_CTX *mem_ctx, const DOM_SID *sid)
 114 {
 115         fstring string_sid;
 116         uint32_t rid;
 117         DOM_SID domsid;
 118
 119         sid_copy(&domsid, sid);
 120         if (!sid_split_rid(&domsid, &rid)) {
 121                 return NULL;
 122         }
 123         if (!sid_to_string(string_sid, &domsid)) {
 124                 return NULL;
 125         }
 126         /* we split by domain and rid so we can do a subtree search
 127            when we only want one domain */
 128         return ldb_dn_string_compose(mem_ctx, NULL, "rid=%u,domain=%s",
 129                                      rid, string_sid);
 130 }
 131
 132 /*
 133   add a group mapping entry
 134  */
 135 static BOOL add_mapping_entry(GROUP_MAP *map, int flag)
 136 {
 137         struct ldb_message *msg;
 138         int ret, i;
 139         fstring string_sid;
 140
 141         msg = ldb_msg_new(ldb);
 142         if (msg == NULL) {
 143                 return False;
 144         }
 145
 146         msg->dn = mapping_dn(msg, &map->sid);
 147         if (msg->dn == NULL) {
 148                 goto failed;
 149         }
 150
 151         if (ldb_msg_add_string(msg, "objectClass", "groupMap") != LDB_SUCCESS ||
 152             ldb_msg_add_string(msg, "sid",
 153                                sid_to_string(string_sid, &map->sid)) != LDB_SUCCESS ||
 154             ldb_msg_add_fmt(msg, "gidNumber", "%u", (unsigned)map->gid) != LDB_SUCCESS ||
 155             ldb_msg_add_fmt(msg, "sidNameUse", "%u", (unsigned)map->sid_name_use) != LDB_SUCCESS ||
 156             ldb_msg_add_string(msg, "comment", map->comment) != LDB_SUCCESS ||
 157             ldb_msg_add_string(msg, "ntName", map->nt_name) != LDB_SUCCESS) {
 158                 goto failed;
 159         }
 160
 161         ret = ldb_add(ldb, msg);
 162
 163         /* if it exists we update it. This is a hangover from the semantics the
 164            tdb backend had */
 165         if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
 166                 for (i=0;i<msg->num_elements;i++) {
 167                         msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
 168                 }
 169                 ret = ldb_modify(ldb, msg);
 170         }
 171
 172         talloc_free(msg);
 173
 174         return ret == LDB_SUCCESS;
 175
 176 failed:
 177         talloc_free(msg);
 178         return False;
 179 }
 180
 181 /*
 182   unpack a ldb message into a GROUP_MAP structure
 183 */
 184 static BOOL msg_to_group_map(struct ldb_message *msg, GROUP_MAP *map)
 185 {
 186         const char *sidstr;
 187
 188         map->gid          = ldb_msg_find_attr_as_int(msg, "gidNumber", -1);
 189         map->sid_name_use = ldb_msg_find_attr_as_int(msg, "sidNameUse", -1);
 190         fstrcpy(map->nt_name, ldb_msg_find_attr_as_string(msg, "ntName", NULL));
 191         fstrcpy(map->comment, ldb_msg_find_attr_as_string(msg, "comment", NULL));
 192         sidstr = ldb_msg_find_attr_as_string(msg, "sid", NULL);
 193
 194         if (!string_to_sid(&map->sid, sidstr) ||
 195             map->gid == (gid_t)-1 ||
 196             map->sid_name_use == (enum lsa_SidType)-1) {
 197                 DEBUG(0,("Unable to unpack group mapping\n"));
 198                 return False;
 199         }
 200
 201         return True;
 202 }
 203
 204 /*
 205  return a group map entry for a given sid
 206 */
 207 static BOOL get_group_map_from_sid(DOM_SID sid, GROUP_MAP *map)
 208 {
 209         int ret;
 210         struct ldb_dn *dn;
 211         struct ldb_result *res=NULL;
 212
 213         dn = mapping_dn(ldb, &sid);
 214         if (dn == NULL) goto failed;
 215
 216         ret = ldb_search(ldb, dn, LDB_SCOPE_BASE, NULL, NULL, &res);
 217         talloc_steal(dn, res);
 218         if (ret != LDB_SUCCESS || res->count != 1) {
 219                 goto failed;
 220         }
 221
 222         if (!msg_to_group_map(res->msgs[0], map)) goto failed;
 223
 224         talloc_free(dn);
 225         return True;
 226
 227 failed:
 228         talloc_free(dn);
 229         return False;
 230 }
 231
 232 /*
 233  return a group map entry for a given gid
 234 */
 235 static BOOL get_group_map_from_gid(gid_t gid, GROUP_MAP *map)
 236 {
 237         int ret;
 238         char *expr;
 239         struct ldb_result *res=NULL;
 240
 241         expr = talloc_asprintf(ldb, "(&(gidNumber=%u)(objectClass=groupMap))",
 242                                (unsigned)gid);
 243         if (expr == NULL) goto failed;
 244
 245         ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE, expr, NULL, &res);
 246         talloc_steal(expr, res);
 247         if (ret != LDB_SUCCESS || res->count != 1) goto failed;
 248
 249         if (!msg_to_group_map(res->msgs[0], map)) goto failed;
 250
 251         talloc_free(expr);
 252         return True;
 253
 254 failed:
 255         talloc_free(expr);
 256         return False;
 257 }
 258
 259 /*
 260   Return the sid and the type of the unix group.
 261 */
 262 static BOOL get_group_map_from_ntname(const char *name, GROUP_MAP *map)
 263 {
 264         int ret;
 265         char *expr;
 266         struct ldb_result *res=NULL;
 267
 268         expr = talloc_asprintf(ldb, "(&(ntName=%s)(objectClass=groupMap))", name);
 269         if (expr == NULL) goto failed;
 270
 271         ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE, expr, NULL, &res);
 272         talloc_steal(expr, res);
 273         if (ret != LDB_SUCCESS || res->count != 1) goto failed;
 274
 275         if (!msg_to_group_map(res->msgs[0], map)) goto failed;
 276
 277         talloc_free(expr);
 278         return True;
 279
 280 failed:
 281         talloc_free(expr);
 282         return False;
 283 }
 284
 285 /*
 286  Remove a group mapping entry.
 287 */
 288 static BOOL group_map_remove(const DOM_SID *sid)
 289 {
 290         struct ldb_dn *dn;
 291         int ret;
 292
 293         dn = mapping_dn(ldb, sid);
 294         if (dn == NULL) {
 295                 return False;
 296         }
 297         ret = ldb_delete(ldb, dn);
 298         talloc_free(dn);
 299
 300         return ret == LDB_SUCCESS;
 301 }
 302
 303
 304 /*
 305   Enumerate the group mappings for a domain
 306 */
 307 static BOOL enum_group_mapping(const DOM_SID *domsid, enum lsa_SidType sid_name_use,
 308                                GROUP_MAP **pp_rmap,
 309                                size_t *p_num_entries, BOOL unix_only)
 310 {
 311         int i, ret;
 312         char *expr;
 313         fstring name;
 314         struct ldb_result *res;
 315         struct ldb_dn *basedn=NULL;
 316         TALLOC_CTX *tmp_ctx;
 317
 318         tmp_ctx = talloc_new(ldb);
 319         if (tmp_ctx == NULL) goto failed;
 320
 321         if (sid_name_use == SID_NAME_UNKNOWN) {
 322                 expr = talloc_asprintf(tmp_ctx, "(&(objectClass=groupMap))");
 323         } else {
 324                 expr = talloc_asprintf(tmp_ctx, "(&(sidNameUse=%u)(objectClass=groupMap))",
 325                                        sid_name_use);
 326         }
 327         if (expr == NULL) goto failed;
 328
 329         /* we do a subtree search on the domain */
 330         if (domsid != NULL) {
 331                 sid_to_string(name, domsid);
 332                 basedn = ldb_dn_string_compose(tmp_ctx, NULL, "domain=%s", name);
 333                 if (basedn == NULL) goto failed;
 334         }
 335
 336         ret = ldb_search(ldb, basedn, LDB_SCOPE_SUBTREE, expr, NULL, &res);
 337         if (ret != LDB_SUCCESS) goto failed;
 338
 339         (*pp_rmap) = NULL;
 340         *p_num_entries = 0;
 341
 342         for (i=0;i<res->count;i++) {
 343                 (*pp_rmap) = SMB_REALLOC_ARRAY((*pp_rmap), GROUP_MAP,
 344                                                (*p_num_entries)+1);
 345                 if (!(*pp_rmap)) goto failed;
 346
 347                 if (!msg_to_group_map(res->msgs[i], &(*pp_rmap)[*p_num_entries])) {
 348                         goto failed;
 349                 }
 350
 351                 (*p_num_entries)++;
 352         }
 353
 354         talloc_free(tmp_ctx);
 355         return True;
 356
 357 failed:
 358         talloc_free(tmp_ctx);
 359         return False;
 360 }
 361
 362 /*
 363    This operation happens on session setup, so it should better be fast. We
 364    store a list of aliases a SID is member of hanging off MEMBEROF/SID.
 365 */
 366 static NTSTATUS one_alias_membership(const DOM_SID *member,
 367                                      DOM_SID **sids, size_t *num)
 368 {
 369         const char *attrs[] = {
 370                 "sid",
 371                 NULL
 372         };
 373         DOM_SID alias;
 374         char *expr;
 375         int ret, i;
 376         struct ldb_result *res=NULL;
 377         fstring string_sid;
 378         NTSTATUS status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 379
 380         if (!sid_to_string(string_sid, member)) {
 381                 return NT_STATUS_INVALID_PARAMETER;
 382         }
 383
 384         expr = talloc_asprintf(ldb, "(&(member=%s)(objectClass=groupMap))",
 385                                string_sid);
 386         if (expr == NULL) goto failed;
 387
 388         ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE, expr, attrs, &res);
 389         talloc_steal(expr, res);
 390         if (ret != LDB_SUCCESS) {
 391                 goto failed;
 392         }
 393
 394         for (i=0;i<res->count;i++) {
 395                 struct ldb_message_element *el;
 396                 el = ldb_msg_find_element(res->msgs[i], "sid");
 397                 if (el == NULL || el->num_values != 1) {
 398                         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 399                         goto failed;
 400                 }
 401                 string_to_sid(&alias, (char *)el->values[0].data);
 402                 if (!add_sid_to_array_unique(NULL, &alias, sids, num)) {
 403                         status = NT_STATUS_NO_MEMORY;
 404                         goto failed;
 405                 }
 406         }
 407
 408         talloc_free(expr);
 409         return NT_STATUS_OK;
 410
 411 failed:
 412         talloc_free(expr);
 413         return status;
 414 }
 415
 416 /*
 417   add/remove a member field
 418 */
 419 static NTSTATUS modify_aliasmem(const DOM_SID *alias, const DOM_SID *member,
 420                                 int operation)
 421 {
 422         fstring string_sid;
 423         int ret;
 424         struct ldb_message msg;
 425         struct ldb_message_element el;
 426         struct ldb_val val;
 427         TALLOC_CTX *tmp_ctx;
 428         GROUP_MAP map;
 429
 430         if (!get_group_map_from_sid(*alias, &map)) {
 431                 sid_to_string(string_sid, alias);
 432                 return NT_STATUS_NO_SUCH_ALIAS;
 433         }
 434
 435         if ((map.sid_name_use != SID_NAME_ALIAS) &&
 436             (map.sid_name_use != SID_NAME_WKN_GRP)) {
 437                 DEBUG(0,("sid_name_use=%d\n", map.sid_name_use));
 438                 return NT_STATUS_NO_SUCH_ALIAS;
 439         }
 440
 441         tmp_ctx = talloc_new(NULL);
 442         if (tmp_ctx == NULL) {
 443                 return NT_STATUS_NO_MEMORY;
 444         }
 445
 446         msg.dn = mapping_dn(tmp_ctx, alias);
 447         if (msg.dn == NULL) {
 448                 return NT_STATUS_NO_MEMORY;
 449         }
 450         msg.num_elements = 1;
 451         msg.elements = &el;
 452         el.flags = operation;
 453         el.name = talloc_strdup(tmp_ctx, "member");
 454         el.num_values = 1;
 455         el.values = &val;
 456         sid_to_string(string_sid, member);
 457         val.data = (uint8_t *)string_sid;
 458         val.length = strlen(string_sid);
 459
 460         ret = ldb_modify(ldb, &msg);
 461         talloc_free(tmp_ctx);
 462
 463         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 464                 return NT_STATUS_NO_SUCH_ALIAS;
 465         }
 466
 467         if (operation == LDB_FLAG_MOD_ADD &&
 468             ret == LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS) {
 469                 return NT_STATUS_MEMBER_IN_ALIAS;
 470         }
 471
 472         return (ret == LDB_SUCCESS ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED);
 473 }
 474
 475 static NTSTATUS add_aliasmem(const DOM_SID *alias, const DOM_SID *member)
 476 {
 477         return modify_aliasmem(alias, member, LDB_FLAG_MOD_ADD);
 478 }
 479
 480 static NTSTATUS del_aliasmem(const DOM_SID *alias, const DOM_SID *member)
 481 {
 482         return modify_aliasmem(alias, member, LDB_FLAG_MOD_DELETE);
 483 }
 484
 485
 486 /*
 487   enumerate sids that have the given alias set in member
 488 */
 489 static NTSTATUS enum_aliasmem(const DOM_SID *alias, DOM_SID **sids, size_t *num)
 490 {
 491         const char *attrs[] = {
 492                 "member",
 493                 NULL
 494         };
 495         int ret, i;
 496         struct ldb_result *res=NULL;
 497         struct ldb_dn *dn;
 498         struct ldb_message_element *el;
 499
 500         *sids = NULL;
 501         *num = 0;
 502
 503         dn = mapping_dn(ldb, alias);
 504         if (dn == NULL) {
 505                 return NT_STATUS_NO_MEMORY;
 506         }
 507
 508         ret = ldb_search(ldb, dn, LDB_SCOPE_BASE, NULL, attrs, &res);
 509         talloc_steal(dn, res);
 510         if (ret == LDB_SUCCESS && res->count == 0) {
 511                 talloc_free(dn);
 512                 return NT_STATUS_OK;
 513         }
 514         if (ret != LDB_SUCCESS) {
 515                 talloc_free(dn);
 516                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 517         }
 518
 519         el = ldb_msg_find_element(res->msgs[0], "member");
 520         if (el == NULL) {
 521                 talloc_free(dn);
 522                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 523         }
 524
 525         for (i=0;i<el->num_values;i++) {
 526                 DOM_SID sid;
 527                 string_to_sid(&sid, (const char *)el->values[i].data);
 528                 if (!add_sid_to_array_unique(NULL, &sid, sids, num)) {
 529                         talloc_free(dn);
 530                         return NT_STATUS_NO_MEMORY;
 531                 }
 532         }
 533         talloc_free(dn);
 534
 535         return NT_STATUS_OK;
 536 }
 537
 538 /*
 539   upgrade one group mapping record from the old tdb format
 540 */
 541 static int upgrade_map_record(TDB_CONTEXT *tdb_ctx, TDB_DATA key,
 542                               TDB_DATA data, void *state)
 543 {
 544         int ret;
 545         GROUP_MAP map;
 546
 547         if (strncmp((char *)key.dptr, GROUP_PREFIX,
 548                     MIN(key.dsize, strlen(GROUP_PREFIX))) != 0) {
 549                 return 0;
 550         }
 551
 552         if (!string_to_sid(&map.sid, strlen(GROUP_PREFIX) + (const char *)key.dptr)) {
 553                 DEBUG(0,("Bad sid key '%s' during upgrade\n", (const char *)key.dptr));
 554                 *(int *)state = -1;
 555                 return -1;
 556         }
 557
 558         ret = tdb_unpack(data.dptr, data.dsize, "ddff",
 559                          &map.gid, &map.sid_name_use, &map.nt_name, &map.comment);
 560         if (ret == -1) {
 561                 DEBUG(0,("Failed to unpack group map record during upgrade\n"));
 562                 *(int *)state = -1;
 563                 return -1;
 564         }
 565
 566         if (!add_mapping_entry(&map, 0)) {
 567                 DEBUG(0,("Failed to add mapping entry during upgrade\n"));
 568                 *(int *)state = -1;
 569                 return -1;
 570         }
 571
 572         return 0;
 573 }
 574
 575 /*
 576   upgrade one alias record from the old tdb format
 577 */
 578 static int upgrade_alias_record(TDB_CONTEXT *tdb_ctx, TDB_DATA key,
 579                                 TDB_DATA data, void *state)
 580 {
 581         const char *p = (const char *)data.dptr;
 582         fstring string_sid;
 583         DOM_SID member;
 584
 585         if (strncmp((char *)key.dptr, MEMBEROF_PREFIX,
 586                     MIN(key.dsize, strlen(MEMBEROF_PREFIX))) != 0) {
 587                 return 0;
 588         }
 589
 590         if (!string_to_sid(&member, strlen(MEMBEROF_PREFIX) + (const char *)key.dptr)) {
 591                 DEBUG(0,("Bad alias key %s during upgrade\n",
 592                          (const char *)key.dptr));
 593                 *(int *)state = -1;
 594         }
 595
 596         while (next_token(&p, string_sid, " ", sizeof(string_sid))) {
 597                 DOM_SID alias;
 598                 NTSTATUS status;
 599                 string_to_sid(&alias, string_sid);
 600                 status = add_aliasmem(&alias, &member);
 601                 if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_ALIAS)) {
 602                         DEBUG(0,("Ignoring orphaned alias record '%s'\n",
 603                                  string_sid));
 604                 } else if (!NT_STATUS_IS_OK(status)) {
 605                         DEBUG(0,("Failed to add alias member during upgrade - %s\n",
 606                                  nt_errstr(status)));
 607                         *(int *)state = -1;
 608                         return -1;
 609                 }
 610         }
 611
 612         return 0;
 613 }
 614
 615 /*
 616   upgrade from a old style tdb
 617 */
 618 static BOOL mapping_upgrade(const char *tdb_path)
 619 {
 620         static TDB_CONTEXT *tdb;
 621         int ret, status=0;
 622         pstring old_path;
 623         pstring new_path;
 624
 625         tdb = tdb_open_log(tdb_path, 0, TDB_DEFAULT, O_RDWR, 0600);
 626         if (tdb == NULL) goto failed;
 627
 628         /* we have to do the map records first, as alias records may
 629            reference them */
 630         ret = tdb_traverse(tdb, upgrade_map_record, &status);
 631         if (ret == -1 || status == -1) goto failed;
 632
 633         ret = tdb_traverse(tdb, upgrade_alias_record, &status);
 634         if (ret == -1 || status == -1) goto failed;
 635
 636         if (tdb) {
 637                 tdb_close(tdb);
 638                 tdb = NULL;
 639         }
 640
 641         pstrcpy(old_path, tdb_path);
 642         pstrcpy(new_path, lock_path("group_mapping.tdb.upgraded"));
 643
 644         if (rename(old_path, new_path) != 0) {
 645                 DEBUG(0,("Failed to rename old group mapping database\n"));
 646                 goto failed;
 647         }
 648         return True;
 649
 650 failed:
 651         DEBUG(0,("Failed to upgrade group mapping database\n"));
 652         if (tdb) tdb_close(tdb);
 653         return False;
 654 }
 655
 656
 657
 658 static const struct mapping_backend ldb_backend = {
 659         .add_mapping_entry         = add_mapping_entry,
 660         .get_group_map_from_sid    = get_group_map_from_sid,
 661         .get_group_map_from_gid    = get_group_map_from_gid,
 662         .get_group_map_from_ntname = get_group_map_from_ntname,
 663         .group_map_remove          = group_map_remove,
 664         .enum_group_mapping        = enum_group_mapping,
 665         .one_alias_membership      = one_alias_membership,
 666         .add_aliasmem              = add_aliasmem,
 667         .del_aliasmem              = del_aliasmem,
 668         .enum_aliasmem             = enum_aliasmem
 669 };
 670
 671 /*
 672   initialise the ldb mapping backend
 673  */
 674 const struct mapping_backend *groupdb_ldb_init(void)
 675 {
 676         if (!init_group_mapping()) {
 677                 DEBUG(0,("Failed to initialise ldb mapping backend\n"));
 678                 return NULL;
 679         }
 680
 681         return &ldb_backend;
 682 }