source3/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 3 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, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include "includes.h"
  25 #include "groupdb/mapping.h"
  26 #include "lib/ldb/include/ldb.h"
  27 #include "lib/ldb/include/ldb_errors.h"
  28
  29 static struct ldb_context *ldb;
  30
  31 static bool mapping_upgrade(const char *tdb_path);
  32
  33 /*
  34   connect to the group mapping ldb
  35 */
  36 static bool init_group_mapping(void)
  37 {
  38         bool existed;
  39         const char *init_ldif[] =
  40                 { "dn: @ATTRIBUTES\n" \
  41                   "ntName: CASE_INSENSITIVE\n" \
  42                   "\n",
  43                   "dn: @INDEXLIST\n" \
  44                   "@IDXATTR: gidNumber\n" \
  45                   "@IDXATTR: ntName\n" \
  46                   "@IDXATTR: member\n" };
  47         const char *db_path, *tdb_path;
  48         int ret;
  49         int flags = 0;
  50
  51         if (ldb != NULL) {
  52                 return True;
  53         }
  54
  55         /* this is needed as Samba3 doesn't have this globally yet */
  56         ldb_global_init();
  57
  58         db_path = state_path("group_mapping.ldb");
  59
  60         ldb = ldb_init(NULL, NULL);
  61         if (ldb == NULL) goto failed;
  62
  63         /* Ensure this db is created read/write for root only. */
  64         ldb_set_create_perms(ldb, 0600);
  65
  66         existed = file_exist(db_path);
  67
  68         if (lp_parm_bool(-1, "groupmap", "nosync", False)) {
  69                 flags |= LDB_FLG_NOSYNC;
  70         }
  71
  72         if (!lp_use_mmap()) {
  73                 flags |= LDB_FLG_NOMMAP;
  74         }
  75
  76         ret = ldb_connect(ldb, db_path, flags, NULL);
  77         if (ret != LDB_SUCCESS) {
  78                 goto failed;
  79         }
  80
  81         /* force the permissions on the ldb to 0600 - this will fix
  82            existing databases as well as new ones */
  83         if (chmod(db_path, 0600) != 0) {
  84                 goto failed;
  85         }
  86
  87         if (!existed) {
  88                 /* initialise the ldb with an index */
  89                 struct ldb_ldif *ldif;
  90                 int i;
  91                 for (i=0;i<ARRAY_SIZE(init_ldif);i++) {
  92                         ldif = ldb_ldif_read_string(ldb, &init_ldif[i]);
  93                         if (ldif == NULL) goto failed;
  94                         ret = ldb_add(ldb, ldif->msg);
  95                         talloc_free(ldif);
  96                         if (ret == -1) goto failed;
  97                 }
  98         }
  99
 100         /* possibly upgrade */
 101         tdb_path = state_path("group_mapping.tdb");
 102         if (file_exist(tdb_path) && !mapping_upgrade(tdb_path)) {
 103                 unlink(state_path("group_mapping.ldb"));
 104                 goto failed;
 105         }
 106
 107         return True;
 108
 109 failed:
 110         DEBUG(0,("Failed to open group mapping ldb '%s' - '%s'\n",
 111                  db_path, ldb?ldb_errstring(ldb):strerror(errno)));
 112         talloc_free(ldb);
 113         ldb = NULL;
 114         return False;
 115 }
 116
 117
 118 /*
 119   form the DN for a mapping entry from a SID
 120  */
 121 static struct ldb_dn *mapping_dn(TALLOC_CTX *mem_ctx, const DOM_SID *sid)
 122 {
 123         fstring string_sid;
 124         uint32_t rid;
 125         DOM_SID domsid;
 126
 127         sid_copy(&domsid, sid);
 128         if (!sid_split_rid(&domsid, &rid)) {
 129                 return NULL;
 130         }
 131         if (!sid_to_fstring(string_sid, &domsid)) {
 132                 return NULL;
 133         }
 134         /* we split by domain and rid so we can do a subtree search
 135            when we only want one domain */
 136         return ldb_dn_new_fmt(mem_ctx, ldb, "rid=%u,domain=%s",
 137                               rid, string_sid);
 138 }
 139
 140 /*
 141   add a group mapping entry
 142  */
 143 static bool add_mapping_entry(GROUP_MAP *map, int flag)
 144 {
 145         struct ldb_message *msg;
 146         int ret, i;
 147         fstring string_sid;
 148
 149         msg = ldb_msg_new(ldb);
 150         if (msg == NULL) {
 151                 return False;
 152         }
 153
 154         msg->dn = mapping_dn(msg, &map->sid);
 155         if (msg->dn == NULL) {
 156                 goto failed;
 157         }
 158
 159         if (ldb_msg_add_string(msg, "objectClass", "groupMap") != LDB_SUCCESS ||
 160             ldb_msg_add_string(msg, "sid",
 161                                sid_to_fstring(string_sid, &map->sid)) != LDB_SUCCESS ||
 162             ldb_msg_add_fmt(msg, "gidNumber", "%u", (unsigned)map->gid) != LDB_SUCCESS ||
 163             ldb_msg_add_fmt(msg, "sidNameUse", "%u", (unsigned)map->sid_name_use) != LDB_SUCCESS ||
 164             ldb_msg_add_string(msg, "comment", map->comment) != LDB_SUCCESS ||
 165             ldb_msg_add_string(msg, "ntName", map->nt_name) != LDB_SUCCESS) {
 166                 goto failed;
 167         }
 168
 169         ret = ldb_add(ldb, msg);
 170
 171         /* if it exists we update it. This is a hangover from the semantics the
 172            tdb backend had */
 173         if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
 174                 for (i=0;i<msg->num_elements;i++) {
 175                         msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
 176                 }
 177                 ret = ldb_modify(ldb, msg);
 178         }
 179
 180         talloc_free(msg);
 181
 182         return ret == LDB_SUCCESS;
 183
 184 failed:
 185         talloc_free(msg);
 186         return False;
 187 }
 188
 189 /*
 190   unpack a ldb message into a GROUP_MAP structure
 191 */
 192 static bool msg_to_group_map(struct ldb_message *msg, GROUP_MAP *map)
 193 {
 194         const char *sidstr;
 195
 196         map->gid          = ldb_msg_find_attr_as_int(msg, "gidNumber", -1);
 197         map->sid_name_use = ldb_msg_find_attr_as_int(msg, "sidNameUse", -1);
 198         fstrcpy(map->nt_name, ldb_msg_find_attr_as_string(msg, "ntName", NULL));
 199         fstrcpy(map->comment, ldb_msg_find_attr_as_string(msg, "comment", NULL));
 200         sidstr = ldb_msg_find_attr_as_string(msg, "sid", NULL);
 201
 202         if (!string_to_sid(&map->sid, sidstr) ||
 203             map->gid == (gid_t)-1 ||
 204             map->sid_name_use == (enum lsa_SidType)-1) {
 205                 DEBUG(0,("Unable to unpack group mapping\n"));
 206                 return False;
 207         }
 208
 209         return True;
 210 }
 211
 212 /*
 213  return a group map entry for a given sid
 214 */
 215 static bool get_group_map_from_sid(DOM_SID sid, GROUP_MAP *map)
 216 {
 217         int ret;
 218         struct ldb_dn *dn;
 219         struct ldb_result *res=NULL;
 220         bool result = false;
 221
 222         dn = mapping_dn(talloc_tos(), &sid);
 223         if (dn == NULL) {
 224                 goto failed;
 225         }
 226
 227         ret = ldb_search(ldb, dn, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
 228         if (ret != LDB_SUCCESS || res->count != 1) {
 229                 goto failed;
 230         }
 231
 232         if (!msg_to_group_map(res->msgs[0], map)) {
 233                 goto failed;
 234         }
 235
 236         result = true;
 237  failed:
 238         talloc_free(dn);
 239         return result;
 240 }
 241
 242 /*
 243  return a group map entry for a given gid
 244 */
 245 static bool get_group_map_from_gid(gid_t gid, GROUP_MAP *map)
 246 {
 247         int ret;
 248         struct ldb_result *res=NULL;
 249         bool result = false;
 250
 251         ret = ldb_search(ldb, talloc_tos(), &res, NULL, LDB_SCOPE_SUBTREE,
 252                          NULL, "(&(gidNumber=%u)(objectClass=groupMap))",
 253                          (unsigned)gid);
 254         if (ret != LDB_SUCCESS || res->count != 1) {
 255                 goto failed;
 256         }
 257
 258         if (!msg_to_group_map(res->msgs[0], map)) {
 259                 goto failed;
 260         }
 261
 262         result = true;
 263 failed:
 264         TALLOC_FREE(res);
 265         return result;
 266 }
 267
 268 /*
 269   Return the sid and the type of the unix group.
 270 */
 271 static bool get_group_map_from_ntname(const char *name, GROUP_MAP *map)
 272 {
 273         int ret;
 274         struct ldb_result *res=NULL;
 275         bool result = false;
 276
 277         ret = ldb_search(ldb, talloc_tos(), &res, NULL, LDB_SCOPE_SUBTREE,
 278                          NULL, "(&(ntName=%s)(objectClass=groupMap))", name);
 279         if (ret != LDB_SUCCESS || res->count != 1) {
 280                 goto failed;
 281         }
 282
 283         if (!msg_to_group_map(res->msgs[0], map)) {
 284                 goto failed;
 285         }
 286
 287         result = true;
 288  failed:
 289         TALLOC_FREE(res);
 290         return result;
 291 }
 292
 293 /*
 294  Remove a group mapping entry.
 295 */
 296 static bool group_map_remove(const DOM_SID *sid)
 297 {
 298         struct ldb_dn *dn;
 299         int ret;
 300
 301         dn = mapping_dn(ldb, sid);
 302         if (dn == NULL) {
 303                 return False;
 304         }
 305         ret = ldb_delete(ldb, dn);
 306         talloc_free(dn);
 307
 308         return ret == LDB_SUCCESS;
 309 }
 310
 311
 312 /*
 313   Enumerate the group mappings for a domain
 314 */
 315 static bool enum_group_mapping(const DOM_SID *domsid, enum lsa_SidType sid_name_use,
 316                                GROUP_MAP **pp_rmap,
 317                                size_t *p_num_entries, bool unix_only)
 318 {
 319         int i, ret;
 320         fstring name;
 321         struct ldb_result *res = NULL;
 322         struct ldb_dn *basedn=NULL;
 323         TALLOC_CTX *tmp_ctx;
 324
 325         tmp_ctx = talloc_new(ldb);
 326         if (tmp_ctx == NULL) goto failed;
 327
 328         /* we do a subtree search on the domain */
 329         if (domsid != NULL) {
 330                 sid_to_fstring(name, domsid);
 331                 basedn = ldb_dn_new_fmt(tmp_ctx, ldb, "domain=%s", name);
 332                 if (basedn == NULL) goto failed;
 333         }
 334
 335         if (sid_name_use == SID_NAME_UNKNOWN) {
 336                 ret = ldb_search(ldb, tmp_ctx, &res, basedn, LDB_SCOPE_SUBTREE,
 337                                  NULL, "(&(objectClass=groupMap))");
 338         } else {
 339                 ret = ldb_search(ldb, tmp_ctx, &res, basedn, LDB_SCOPE_SUBTREE,
 340                                  NULL, "(&(sidNameUse=%u)(objectClass=groupMap))",
 341                                  sid_name_use);
 342         }
 343
 344         if (ret != LDB_SUCCESS) goto failed;
 345
 346         (*pp_rmap) = NULL;
 347         *p_num_entries = 0;
 348
 349         for (i=0;i<res->count;i++) {
 350                 (*pp_rmap) = SMB_REALLOC_ARRAY((*pp_rmap), GROUP_MAP,
 351                                                (*p_num_entries)+1);
 352                 if (!(*pp_rmap)) goto failed;
 353
 354                 if (!msg_to_group_map(res->msgs[i], &(*pp_rmap)[*p_num_entries])) {
 355                         goto failed;
 356                 }
 357
 358                 (*p_num_entries)++;
 359         }
 360
 361         talloc_free(tmp_ctx);
 362         return True;
 363
 364 failed:
 365         talloc_free(tmp_ctx);
 366         return False;
 367 }
 368
 369 /*
 370    This operation happens on session setup, so it should better be fast. We
 371    store a list of aliases a SID is member of hanging off MEMBEROF/SID.
 372 */
 373 static NTSTATUS one_alias_membership(const DOM_SID *member,
 374                                      DOM_SID **sids, size_t *num)
 375 {
 376         const char *attrs[] = {
 377                 "sid",
 378                 NULL
 379         };
 380         DOM_SID alias;
 381         int ret, i;
 382         struct ldb_result *res=NULL;
 383         fstring string_sid;
 384         NTSTATUS status;
 385
 386         if (!sid_to_fstring(string_sid, member)) {
 387                 return NT_STATUS_INVALID_PARAMETER;
 388         }
 389
 390         ret = ldb_search(ldb, talloc_tos(), &res, NULL, LDB_SCOPE_SUBTREE,
 391                          attrs, "(&(member=%s)(objectClass=groupMap))",
 392                          string_sid);
 393         if (ret != LDB_SUCCESS) {
 394                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 395                 goto failed;
 396         }
 397
 398         for (i=0;i<res->count;i++) {
 399                 struct ldb_message_element *el;
 400                 el = ldb_msg_find_element(res->msgs[i], "sid");
 401                 if (el == NULL || el->num_values != 1) {
 402                         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 403                         goto failed;
 404                 }
 405                 string_to_sid(&alias, (char *)el->values[0].data);
 406                 status = add_sid_to_array_unique(NULL, &alias, sids, num);
 407                 if (!NT_STATUS_IS_OK(status)) {
 408                         goto failed;
 409                 }
 410         }
 411
 412         status = NT_STATUS_OK;
 413  failed:
 414         TALLOC_FREE(res);
 415         return status;
 416 }
 417
 418 /*
 419   add/remove a member field
 420 */
 421 static NTSTATUS modify_aliasmem(const DOM_SID *alias, const DOM_SID *member,
 422                                 int operation)
 423 {
 424         fstring string_sid;
 425         int ret;
 426         struct ldb_message msg;
 427         struct ldb_message_element el;
 428         struct ldb_val val;
 429         TALLOC_CTX *tmp_ctx;
 430         GROUP_MAP map;
 431
 432         if (!get_group_map_from_sid(*alias, &map)) {
 433                 sid_to_fstring(string_sid, alias);
 434                 return NT_STATUS_NO_SUCH_ALIAS;
 435         }
 436
 437         if ((map.sid_name_use != SID_NAME_ALIAS) &&
 438             (map.sid_name_use != SID_NAME_WKN_GRP)) {
 439                 DEBUG(0,("sid_name_use=%d\n", map.sid_name_use));
 440                 return NT_STATUS_NO_SUCH_ALIAS;
 441         }
 442
 443         tmp_ctx = talloc_new(NULL);
 444         if (tmp_ctx == NULL) {
 445                 return NT_STATUS_NO_MEMORY;
 446         }
 447
 448         msg.dn = mapping_dn(tmp_ctx, alias);
 449         if (msg.dn == NULL) {
 450                 return NT_STATUS_NO_MEMORY;
 451         }
 452         msg.num_elements = 1;
 453         msg.elements = &el;
 454         el.flags = operation;
 455         el.name = talloc_strdup(tmp_ctx, "member");
 456         el.num_values = 1;
 457         el.values = &val;
 458         sid_to_fstring(string_sid, member);
 459         val.data = (uint8_t *)string_sid;
 460         val.length = strlen(string_sid);
 461
 462         ret = ldb_modify(ldb, &msg);
 463         talloc_free(tmp_ctx);
 464
 465         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 466                 return NT_STATUS_NO_SUCH_ALIAS;
 467         }
 468
 469         if (operation == LDB_FLAG_MOD_ADD &&
 470             ret == LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS) {
 471                 return NT_STATUS_MEMBER_IN_ALIAS;
 472         }
 473
 474         return (ret == LDB_SUCCESS ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED);
 475 }
 476
 477 static NTSTATUS add_aliasmem(const DOM_SID *alias, const DOM_SID *member)
 478 {
 479         return modify_aliasmem(alias, member, LDB_FLAG_MOD_ADD);
 480 }
 481
 482 static NTSTATUS del_aliasmem(const DOM_SID *alias, const DOM_SID *member)
 483 {
 484         return modify_aliasmem(alias, member, LDB_FLAG_MOD_DELETE);
 485 }
 486
 487
 488 /*
 489   enumerate sids that have the given alias set in member
 490 */
 491 static NTSTATUS enum_aliasmem(const DOM_SID *alias, TALLOC_CTX *mem_ctx,
 492                               DOM_SID **sids, size_t *num)
 493 {
 494         const char *attrs[] = {
 495                 "member",
 496                 NULL
 497         };
 498         int ret, i;
 499         NTSTATUS status = NT_STATUS_OK;
 500         struct ldb_result *res=NULL;
 501         struct ldb_dn *dn;
 502         struct ldb_message_element *el;
 503
 504         *sids = NULL;
 505         *num = 0;
 506
 507         dn = mapping_dn(ldb, alias);
 508         if (dn == NULL) {
 509                 return NT_STATUS_NO_MEMORY;
 510         }
 511
 512         ret = ldb_search(ldb, ldb, &res, dn, LDB_SCOPE_BASE, attrs, NULL);
 513         if (ret == LDB_SUCCESS && res->count == 0) {
 514                 talloc_free(res);
 515                 talloc_free(dn);
 516                 return NT_STATUS_OK;
 517         }
 518         if (ret != LDB_SUCCESS) {
 519                 talloc_free(dn);
 520                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 521         }
 522
 523         talloc_steal(dn, res);
 524         el = ldb_msg_find_element(res->msgs[0], "member");
 525         if (el == NULL) {
 526                 talloc_free(dn);
 527                 return NT_STATUS_OK;
 528         }
 529
 530         for (i=0;i<el->num_values;i++) {
 531                 DOM_SID sid;
 532                 string_to_sid(&sid, (const char *)el->values[i].data);
 533                 status = add_sid_to_array_unique(mem_ctx, &sid, sids, num);
 534                 if (!NT_STATUS_IS_OK(status)) {
 535                         goto done;
 536                 }
 537         }
 538
 539 done:
 540         talloc_free(dn);
 541         return status;
 542 }
 543
 544 /*
 545   upgrade one group mapping record from the old tdb format
 546 */
 547 static int upgrade_map_record(TDB_CONTEXT *tdb_ctx, TDB_DATA key,
 548                               TDB_DATA data, void *state)
 549 {
 550         int ret;
 551         GROUP_MAP map;
 552
 553         if (strncmp((char *)key.dptr, GROUP_PREFIX,
 554                     MIN(key.dsize, strlen(GROUP_PREFIX))) != 0) {
 555                 return 0;
 556         }
 557
 558         if (!string_to_sid(&map.sid, strlen(GROUP_PREFIX) + (const char *)key.dptr)) {
 559                 DEBUG(0,("Bad sid key '%s' during upgrade\n", (const char *)key.dptr));
 560                 *(int *)state = -1;
 561                 return -1;
 562         }
 563
 564         ret = tdb_unpack(data.dptr, data.dsize, "ddff",
 565                          &map.gid, &map.sid_name_use, &map.nt_name, &map.comment);
 566         if (ret == -1) {
 567                 DEBUG(0,("Failed to unpack group map record during upgrade\n"));
 568                 *(int *)state = -1;
 569                 return -1;
 570         }
 571
 572         if ((int)map.gid == -1) {
 573                 /*
 574                  * Ignore old invalid mappings
 575                  */
 576                 return 0;
 577         }
 578
 579         if (!add_mapping_entry(&map, 0)) {
 580                 DEBUG(0,("Failed to add mapping entry during upgrade\n"));
 581                 *(int *)state = -1;
 582                 return -1;
 583         }
 584
 585         return 0;
 586 }
 587
 588 /*
 589   upgrade one alias record from the old tdb format
 590 */
 591 static int upgrade_alias_record(TDB_CONTEXT *tdb_ctx, TDB_DATA key,
 592                                 TDB_DATA data, void *state)
 593 {
 594         const char *p = (const char *)data.dptr;
 595         char *string_sid;
 596         DOM_SID member;
 597         TALLOC_CTX *frame;
 598
 599         if (strncmp((char *)key.dptr, MEMBEROF_PREFIX,
 600                     MIN(key.dsize, strlen(MEMBEROF_PREFIX))) != 0) {
 601                 return 0;
 602         }
 603
 604         if (!string_to_sid(&member, strlen(MEMBEROF_PREFIX) + (const char *)key.dptr)) {
 605                 DEBUG(0,("Bad alias key %s during upgrade\n",
 606                          (const char *)key.dptr));
 607                 *(int *)state = -1;
 608         }
 609
 610         frame = talloc_stackframe();
 611         while (next_token_talloc(frame,&p, &string_sid, " ")) {
 612                 DOM_SID alias;
 613                 NTSTATUS status;
 614                 string_to_sid(&alias, string_sid);
 615                 status = add_aliasmem(&alias, &member);
 616                 if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_ALIAS)) {
 617                         DEBUG(0,("Ignoring orphaned alias record '%s'\n",
 618                                  string_sid));
 619                 } else if (!NT_STATUS_IS_OK(status)) {
 620                         DEBUG(0,("Failed to add alias member during upgrade - %s\n",
 621                                  nt_errstr(status)));
 622                         *(int *)state = -1;
 623                         TALLOC_FREE(frame);
 624                         return -1;
 625                 }
 626         }
 627         TALLOC_FREE(frame);
 628         return 0;
 629 }
 630
 631 /*
 632   upgrade from a old style tdb
 633 */
 634 static bool mapping_upgrade(const char *tdb_path)
 635 {
 636         static TDB_CONTEXT *tdb;
 637         int ret, status=0;
 638
 639         tdb = tdb_open_log(tdb_path, 0, TDB_DEFAULT, O_RDWR, 0600);
 640         if (tdb == NULL) goto failed;
 641
 642         /* we have to do the map records first, as alias records may
 643            reference them */
 644         ret = tdb_traverse(tdb, upgrade_map_record, &status);
 645         if (ret == -1 || status == -1) goto failed;
 646
 647         ret = tdb_traverse(tdb, upgrade_alias_record, &status);
 648         if (ret == -1 || status == -1) goto failed;
 649
 650         if (tdb) {
 651                 tdb_close(tdb);
 652                 tdb = NULL;
 653         }
 654
 655         {
 656                 const char *old_path = tdb_path;
 657                 char *new_path = state_path("group_mapping.tdb.upgraded");
 658
 659                 if (!new_path) {
 660                         goto failed;
 661                 }
 662                 if (rename(old_path, new_path) != 0) {
 663                         DEBUG(0,("Failed to rename old group mapping database\n"));
 664                         goto failed;
 665                 }
 666         }
 667         return True;
 668
 669 failed:
 670         DEBUG(0,("Failed to upgrade group mapping database\n"));
 671         if (tdb) tdb_close(tdb);
 672         return False;
 673 }
 674
 675
 676
 677 static const struct mapping_backend ldb_backend = {
 678         .add_mapping_entry         = add_mapping_entry,
 679         .get_group_map_from_sid    = get_group_map_from_sid,
 680         .get_group_map_from_gid    = get_group_map_from_gid,
 681         .get_group_map_from_ntname = get_group_map_from_ntname,
 682         .group_map_remove          = group_map_remove,
 683         .enum_group_mapping        = enum_group_mapping,
 684         .one_alias_membership      = one_alias_membership,
 685         .add_aliasmem              = add_aliasmem,
 686         .del_aliasmem              = del_aliasmem,
 687         .enum_aliasmem             = enum_aliasmem
 688 };
 689
 690 /*
 691   initialise the ldb mapping backend
 692  */
 693 const struct mapping_backend *groupdb_ldb_init(void)
 694 {
 695         if (!init_group_mapping()) {
 696                 DEBUG(0,("Failed to initialise ldb mapping backend\n"));
 697                 return NULL;
 698         }
 699
 700         return &ldb_backend;
 701 }