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 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/includes.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);
  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, NULL);
  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, NULL) && !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_string_compose(mem_ctx, NULL, "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
 221         dn = mapping_dn(ldb, &sid);
 222         if (dn == NULL) goto failed;
 223
 224         ret = ldb_search(ldb, dn, LDB_SCOPE_BASE, NULL, NULL, &res);
 225         talloc_steal(dn, res);
 226         if (ret != LDB_SUCCESS || res->count != 1) {
 227                 goto failed;
 228         }
 229
 230         if (!msg_to_group_map(res->msgs[0], map)) goto failed;
 231
 232         talloc_free(dn);
 233         return True;
 234
 235 failed:
 236         talloc_free(dn);
 237         return False;
 238 }
 239
 240 /*
 241  return a group map entry for a given gid
 242 */
 243 static bool get_group_map_from_gid(gid_t gid, GROUP_MAP *map)
 244 {
 245         int ret;
 246         char *expr;
 247         struct ldb_result *res=NULL;
 248
 249         expr = talloc_asprintf(ldb, "(&(gidNumber=%u)(objectClass=groupMap))",
 250                                (unsigned)gid);
 251         if (expr == NULL) goto failed;
 252
 253         ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE, expr, NULL, &res);
 254         talloc_steal(expr, res);
 255         if (ret != LDB_SUCCESS || res->count != 1) goto failed;
 256
 257         if (!msg_to_group_map(res->msgs[0], map)) goto failed;
 258
 259         talloc_free(expr);
 260         return True;
 261
 262 failed:
 263         talloc_free(expr);
 264         return False;
 265 }
 266
 267 /*
 268   Return the sid and the type of the unix group.
 269 */
 270 static bool get_group_map_from_ntname(const char *name, GROUP_MAP *map)
 271 {
 272         int ret;
 273         char *expr;
 274         struct ldb_result *res=NULL;
 275
 276         expr = talloc_asprintf(ldb, "(&(ntName=%s)(objectClass=groupMap))", name);
 277         if (expr == NULL) goto failed;
 278
 279         ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE, expr, NULL, &res);
 280         talloc_steal(expr, res);
 281         if (ret != LDB_SUCCESS || res->count != 1) goto failed;
 282
 283         if (!msg_to_group_map(res->msgs[0], map)) goto failed;
 284
 285         talloc_free(expr);
 286         return True;
 287
 288 failed:
 289         talloc_free(expr);
 290         return False;
 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         char *expr;
 321         fstring name;
 322         struct ldb_result *res = NULL;
 323         struct ldb_dn *basedn=NULL;
 324         TALLOC_CTX *tmp_ctx;
 325
 326         tmp_ctx = talloc_new(ldb);
 327         if (tmp_ctx == NULL) goto failed;
 328
 329         if (sid_name_use == SID_NAME_UNKNOWN) {
 330                 expr = talloc_asprintf(tmp_ctx, "(&(objectClass=groupMap))");
 331         } else {
 332                 expr = talloc_asprintf(tmp_ctx, "(&(sidNameUse=%u)(objectClass=groupMap))",
 333                                        sid_name_use);
 334         }
 335         if (expr == NULL) goto failed;
 336
 337         /* we do a subtree search on the domain */
 338         if (domsid != NULL) {
 339                 sid_to_fstring(name, domsid);
 340                 basedn = ldb_dn_string_compose(tmp_ctx, NULL, "domain=%s", name);
 341                 if (basedn == NULL) goto failed;
 342         }
 343
 344         ret = ldb_search(ldb, basedn, LDB_SCOPE_SUBTREE, expr, NULL, &res);
 345         talloc_steal(tmp_ctx, res);
 346         if (ret != LDB_SUCCESS) goto failed;
 347
 348         (*pp_rmap) = NULL;
 349         *p_num_entries = 0;
 350
 351         for (i=0;i<res->count;i++) {
 352                 (*pp_rmap) = SMB_REALLOC_ARRAY((*pp_rmap), GROUP_MAP,
 353                                                (*p_num_entries)+1);
 354                 if (!(*pp_rmap)) goto failed;
 355
 356                 if (!msg_to_group_map(res->msgs[i], &(*pp_rmap)[*p_num_entries])) {
 357                         goto failed;
 358                 }
 359
 360                 (*p_num_entries)++;
 361         }
 362
 363         talloc_free(tmp_ctx);
 364         return True;
 365
 366 failed:
 367         talloc_free(tmp_ctx);
 368         return False;
 369 }
 370
 371 /*
 372    This operation happens on session setup, so it should better be fast. We
 373    store a list of aliases a SID is member of hanging off MEMBEROF/SID.
 374 */
 375 static NTSTATUS one_alias_membership(const DOM_SID *member,
 376                                      DOM_SID **sids, size_t *num)
 377 {
 378         const char *attrs[] = {
 379                 "sid",
 380                 NULL
 381         };
 382         DOM_SID alias;
 383         char *expr;
 384         int ret, i;
 385         struct ldb_result *res=NULL;
 386         fstring string_sid;
 387         NTSTATUS status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 388
 389         if (!sid_to_fstring(string_sid, member)) {
 390                 return NT_STATUS_INVALID_PARAMETER;
 391         }
 392
 393         expr = talloc_asprintf(ldb, "(&(member=%s)(objectClass=groupMap))",
 394                                string_sid);
 395         if (expr == NULL) goto failed;
 396
 397         ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE, expr, attrs, &res);
 398         talloc_steal(expr, res);
 399         if (ret != LDB_SUCCESS) {
 400                 goto failed;
 401         }
 402
 403         for (i=0;i<res->count;i++) {
 404                 struct ldb_message_element *el;
 405                 el = ldb_msg_find_element(res->msgs[i], "sid");
 406                 if (el == NULL || el->num_values != 1) {
 407                         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 408                         goto failed;
 409                 }
 410                 string_to_sid(&alias, (char *)el->values[0].data);
 411                 status = add_sid_to_array_unique(NULL, &alias, sids, num);
 412                 if (!NT_STATUS_IS_OK(status)) {
 413                         goto failed;
 414                 }
 415         }
 416
 417         talloc_free(expr);
 418         return NT_STATUS_OK;
 419
 420 failed:
 421         talloc_free(expr);
 422         return status;
 423 }
 424
 425 /*
 426   add/remove a member field
 427 */
 428 static NTSTATUS modify_aliasmem(const DOM_SID *alias, const DOM_SID *member,
 429                                 int operation)
 430 {
 431         fstring string_sid;
 432         int ret;
 433         struct ldb_message msg;
 434         struct ldb_message_element el;
 435         struct ldb_val val;
 436         TALLOC_CTX *tmp_ctx;
 437         GROUP_MAP map;
 438
 439         if (!get_group_map_from_sid(*alias, &map)) {
 440                 sid_to_fstring(string_sid, alias);
 441                 return NT_STATUS_NO_SUCH_ALIAS;
 442         }
 443
 444         if ((map.sid_name_use != SID_NAME_ALIAS) &&
 445             (map.sid_name_use != SID_NAME_WKN_GRP)) {
 446                 DEBUG(0,("sid_name_use=%d\n", map.sid_name_use));
 447                 return NT_STATUS_NO_SUCH_ALIAS;
 448         }
 449
 450         tmp_ctx = talloc_new(NULL);
 451         if (tmp_ctx == NULL) {
 452                 return NT_STATUS_NO_MEMORY;
 453         }
 454
 455         msg.dn = mapping_dn(tmp_ctx, alias);
 456         if (msg.dn == NULL) {
 457                 return NT_STATUS_NO_MEMORY;
 458         }
 459         msg.num_elements = 1;
 460         msg.elements = &el;
 461         el.flags = operation;
 462         el.name = talloc_strdup(tmp_ctx, "member");
 463         el.num_values = 1;
 464         el.values = &val;
 465         sid_to_fstring(string_sid, member);
 466         val.data = (uint8_t *)string_sid;
 467         val.length = strlen(string_sid);
 468
 469         ret = ldb_modify(ldb, &msg);
 470         talloc_free(tmp_ctx);
 471
 472         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
 473                 return NT_STATUS_NO_SUCH_ALIAS;
 474         }
 475
 476         if (operation == LDB_FLAG_MOD_ADD &&
 477             ret == LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS) {
 478                 return NT_STATUS_MEMBER_IN_ALIAS;
 479         }
 480
 481         return (ret == LDB_SUCCESS ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED);
 482 }
 483
 484 static NTSTATUS add_aliasmem(const DOM_SID *alias, const DOM_SID *member)
 485 {
 486         return modify_aliasmem(alias, member, LDB_FLAG_MOD_ADD);
 487 }
 488
 489 static NTSTATUS del_aliasmem(const DOM_SID *alias, const DOM_SID *member)
 490 {
 491         return modify_aliasmem(alias, member, LDB_FLAG_MOD_DELETE);
 492 }
 493
 494
 495 /*
 496   enumerate sids that have the given alias set in member
 497 */
 498 static NTSTATUS enum_aliasmem(const DOM_SID *alias, DOM_SID **sids, size_t *num)
 499 {
 500         const char *attrs[] = {
 501                 "member",
 502                 NULL
 503         };
 504         int ret, i;
 505         NTSTATUS status = NT_STATUS_OK;
 506         struct ldb_result *res=NULL;
 507         struct ldb_dn *dn;
 508         struct ldb_message_element *el;
 509
 510         *sids = NULL;
 511         *num = 0;
 512
 513         dn = mapping_dn(ldb, alias);
 514         if (dn == NULL) {
 515                 return NT_STATUS_NO_MEMORY;
 516         }
 517
 518         ret = ldb_search(ldb, dn, LDB_SCOPE_BASE, NULL, attrs, &res);
 519         talloc_steal(dn, res);
 520         if (ret == LDB_SUCCESS && res->count == 0) {
 521                 talloc_free(dn);
 522                 return NT_STATUS_OK;
 523         }
 524         if (ret != LDB_SUCCESS) {
 525                 talloc_free(dn);
 526                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 527         }
 528
 529         el = ldb_msg_find_element(res->msgs[0], "member");
 530         if (el == NULL) {
 531                 talloc_free(dn);
 532                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 533         }
 534
 535         for (i=0;i<el->num_values;i++) {
 536                 DOM_SID sid;
 537                 string_to_sid(&sid, (const char *)el->values[i].data);
 538                 status = add_sid_to_array_unique(NULL, &sid, sids, num);
 539                 if (!NT_STATUS_IS_OK(status)) {
 540                         goto done;
 541                 }
 542         }
 543
 544 done:
 545         talloc_free(dn);
 546         return status;
 547 }
 548
 549 /*
 550   upgrade one group mapping record from the old tdb format
 551 */
 552 static int upgrade_map_record(TDB_CONTEXT *tdb_ctx, TDB_DATA key,
 553                               TDB_DATA data, void *state)
 554 {
 555         int ret;
 556         GROUP_MAP map;
 557
 558         if (strncmp((char *)key.dptr, GROUP_PREFIX,
 559                     MIN(key.dsize, strlen(GROUP_PREFIX))) != 0) {
 560                 return 0;
 561         }
 562
 563         if (!string_to_sid(&map.sid, strlen(GROUP_PREFIX) + (const char *)key.dptr)) {
 564                 DEBUG(0,("Bad sid key '%s' during upgrade\n", (const char *)key.dptr));
 565                 *(int *)state = -1;
 566                 return -1;
 567         }
 568
 569         ret = tdb_unpack(data.dptr, data.dsize, "ddff",
 570                          &map.gid, &map.sid_name_use, &map.nt_name, &map.comment);
 571         if (ret == -1) {
 572                 DEBUG(0,("Failed to unpack group map record during upgrade\n"));
 573                 *(int *)state = -1;
 574                 return -1;
 575         }
 576
 577         if (!add_mapping_entry(&map, 0)) {
 578                 DEBUG(0,("Failed to add mapping entry during upgrade\n"));
 579                 *(int *)state = -1;
 580                 return -1;
 581         }
 582
 583         return 0;
 584 }
 585
 586 /*
 587   upgrade one alias record from the old tdb format
 588 */
 589 static int upgrade_alias_record(TDB_CONTEXT *tdb_ctx, TDB_DATA key,
 590                                 TDB_DATA data, void *state)
 591 {
 592         const char *p = (const char *)data.dptr;
 593         char *string_sid;
 594         DOM_SID member;
 595         TALLOC_CTX *frame;
 596
 597         if (strncmp((char *)key.dptr, MEMBEROF_PREFIX,
 598                     MIN(key.dsize, strlen(MEMBEROF_PREFIX))) != 0) {
 599                 return 0;
 600         }
 601
 602         if (!string_to_sid(&member, strlen(MEMBEROF_PREFIX) + (const char *)key.dptr)) {
 603                 DEBUG(0,("Bad alias key %s during upgrade\n",
 604                          (const char *)key.dptr));
 605                 *(int *)state = -1;
 606         }
 607
 608         frame = talloc_stackframe();
 609         while (next_token_talloc(frame,&p, &string_sid, " ")) {
 610                 DOM_SID alias;
 611                 NTSTATUS status;
 612                 string_to_sid(&alias, string_sid);
 613                 status = add_aliasmem(&alias, &member);
 614                 if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_ALIAS)) {
 615                         DEBUG(0,("Ignoring orphaned alias record '%s'\n",
 616                                  string_sid));
 617                 } else if (!NT_STATUS_IS_OK(status)) {
 618                         DEBUG(0,("Failed to add alias member during upgrade - %s\n",
 619                                  nt_errstr(status)));
 620                         *(int *)state = -1;
 621                         TALLOC_FREE(frame);
 622                         return -1;
 623                 }
 624         }
 625         TALLOC_FREE(frame);
 626         return 0;
 627 }
 628
 629 /*
 630   upgrade from a old style tdb
 631 */
 632 static bool mapping_upgrade(const char *tdb_path)
 633 {
 634         static TDB_CONTEXT *tdb;
 635         int ret, status=0;
 636
 637         tdb = tdb_open_log(tdb_path, 0, TDB_DEFAULT, O_RDWR, 0600);
 638         if (tdb == NULL) goto failed;
 639
 640         /* we have to do the map records first, as alias records may
 641            reference them */
 642         ret = tdb_traverse(tdb, upgrade_map_record, &status);
 643         if (ret == -1 || status == -1) goto failed;
 644
 645         ret = tdb_traverse(tdb, upgrade_alias_record, &status);
 646         if (ret == -1 || status == -1) goto failed;
 647
 648         if (tdb) {
 649                 tdb_close(tdb);
 650                 tdb = NULL;
 651         }
 652
 653         {
 654                 const char *old_path = tdb_path;
 655                 char *new_path = state_path("group_mapping.tdb.upgraded");
 656
 657                 if (!new_path) {
 658                         goto failed;
 659                 }
 660                 if (rename(old_path, new_path) != 0) {
 661                         DEBUG(0,("Failed to rename old group mapping database\n"));
 662                         goto failed;
 663                 }
 664         }
 665         return True;
 666
 667 failed:
 668         DEBUG(0,("Failed to upgrade group mapping database\n"));
 669         if (tdb) tdb_close(tdb);
 670         return False;
 671 }
 672
 673
 674
 675 static const struct mapping_backend ldb_backend = {
 676         .add_mapping_entry         = add_mapping_entry,
 677         .get_group_map_from_sid    = get_group_map_from_sid,
 678         .get_group_map_from_gid    = get_group_map_from_gid,
 679         .get_group_map_from_ntname = get_group_map_from_ntname,
 680         .group_map_remove          = group_map_remove,
 681         .enum_group_mapping        = enum_group_mapping,
 682         .one_alias_membership      = one_alias_membership,
 683         .add_aliasmem              = add_aliasmem,
 684         .del_aliasmem              = del_aliasmem,
 685         .enum_aliasmem             = enum_aliasmem
 686 };
 687
 688 /*
 689   initialise the ldb mapping backend
 690  */
 691 const struct mapping_backend *groupdb_ldb_init(void)
 692 {
 693         if (!init_group_mapping()) {
 694                 DEBUG(0,("Failed to initialise ldb mapping backend\n"));
 695                 return NULL;
 696         }
 697
 698         return &ldb_backend;
 699 }