source3/groupdb/mapping_tdb.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *  RPC Pipe client / server routines
   4  *  Copyright (C) Andrew Tridgell              1992-2006,
   5  *  Copyright (C) Jean François Micouleau      1998-2001.
   6  *  Copyright (C) Volker Lendecke              2006.
   7  *  Copyright (C) Gerald Carter                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 "groupdb/mapping.h"
  25
  26 static struct db_context *db; /* used for driver files */
  27
  28 static bool enum_group_mapping(const DOM_SID *domsid,
  29                                enum lsa_SidType sid_name_use,
  30                                GROUP_MAP **pp_rmap,
  31                                size_t *p_num_entries,
  32                                bool unix_only);
  33 static bool group_map_remove(const DOM_SID *sid);
  34
  35 static bool mapping_switch(const char *ldb_path);
  36
  37 /****************************************************************************
  38  Open the group mapping tdb.
  39 ****************************************************************************/
  40 static bool init_group_mapping(void)
  41 {
  42         const char *ldb_path;
  43
  44         if (db != NULL) {
  45                 return true;
  46         }
  47
  48         db = db_open(NULL, state_path("group_mapping.tdb"), 0,
  49                            TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
  50         if (db == NULL) {
  51                 DEBUG(0, ("Failed to open group mapping database: %s\n",
  52                           strerror(errno)));
  53                 return false;
  54         }
  55
  56         ldb_path = state_path("group_mapping.ldb");
  57         if (file_exist(ldb_path) && !mapping_switch(ldb_path)) {
  58                 unlink(state_path("group_mapping.tdb"));
  59                 return false;
  60
  61         } else {
  62                 /* handle upgrade from old versions of the database */
  63 #if 0 /* -- Needs conversion to dbwrap -- */
  64                 const char *vstring = "INFO/version";
  65                 int32 vers_id;
  66                 GROUP_MAP *map_table = NULL;
  67                 size_t num_entries = 0;
  68
  69                 /* handle a Samba upgrade */
  70                 tdb_lock_bystring(tdb, vstring);
  71
  72                 /* Cope with byte-reversed older versions of the db. */
  73                 vers_id = tdb_fetch_int32(tdb, vstring);
  74                 if ((vers_id == DATABASE_VERSION_V1)
  75                     || (IREV(vers_id) == DATABASE_VERSION_V1)) {
  76                         /*
  77                          * Written on a bigendian machine with old fetch_int
  78                          * code. Save as le.
  79                          */
  80                         tdb_store_int32(tdb, vstring, DATABASE_VERSION_V2);
  81                         vers_id = DATABASE_VERSION_V2;
  82                 }
  83
  84                 /* if its an unknown version we remove everthing in the db */
  85
  86                 if (vers_id != DATABASE_VERSION_V2) {
  87                         tdb_wipe_all(tdb);
  88                         tdb_store_int32(tdb, vstring, DATABASE_VERSION_V2);
  89                 }
  90
  91                 tdb_unlock_bystring(tdb, vstring);
  92
  93                 /* cleanup any map entries with a gid == -1 */
  94
  95                 if ( enum_group_mapping( NULL, SID_NAME_UNKNOWN, &map_table,
  96                                          &num_entries, False ) ) {
  97                         int i;
  98
  99                         for ( i=0; i<num_entries; i++ ) {
 100                                 if ( map_table[i].gid == -1 ) {
 101                                         group_map_remove( &map_table[i].sid );
 102                                 }
 103                         }
 104
 105                         SAFE_FREE( map_table );
 106                 }
 107 #endif
 108         }
 109         return true;
 110 }
 111
 112 static char *group_mapping_key(TALLOC_CTX *mem_ctx, const DOM_SID *sid)
 113 {
 114         char *sidstr, *result;
 115
 116         sidstr = sid_string_talloc(talloc_tos(), sid);
 117         if (sidstr == NULL) {
 118                 return NULL;
 119         }
 120
 121         result = talloc_asprintf(mem_ctx, "%s%s", GROUP_PREFIX, sidstr);
 122
 123         TALLOC_FREE(sidstr);
 124         return result;
 125 }
 126
 127 /****************************************************************************
 128 ****************************************************************************/
 129 static bool add_mapping_entry(GROUP_MAP *map, int flag)
 130 {
 131         char *key, *buf;
 132         int len;
 133         NTSTATUS status;
 134
 135         key = group_mapping_key(talloc_tos(), &map->sid);
 136         if (key == NULL) {
 137                 return false;
 138         }
 139
 140         len = tdb_pack(NULL, 0, "ddff",
 141                 map->gid, map->sid_name_use, map->nt_name, map->comment);
 142
 143         buf = TALLOC_ARRAY(key, char, len);
 144         if (!buf) {
 145                 TALLOC_FREE(key);
 146                 return false;
 147         }
 148         len = tdb_pack((uint8 *)buf, len, "ddff", map->gid,
 149                        map->sid_name_use, map->nt_name, map->comment);
 150
 151         status = dbwrap_trans_store(
 152                 db, string_term_tdb_data(key),
 153                 make_tdb_data((uint8_t *)buf, len), TDB_REPLACE);
 154
 155         TALLOC_FREE(key);
 156
 157         return NT_STATUS_IS_OK(status);
 158 }
 159
 160
 161 /****************************************************************************
 162  Return the sid and the type of the unix group.
 163 ****************************************************************************/
 164
 165 static bool get_group_map_from_sid(DOM_SID sid, GROUP_MAP *map)
 166 {
 167         TDB_DATA dbuf;
 168         char *key;
 169         int ret = 0;
 170
 171         /* the key is the SID, retrieving is direct */
 172
 173         key = group_mapping_key(talloc_tos(), &sid);
 174         if (key == NULL) {
 175                 return false;
 176         }
 177
 178         dbuf = dbwrap_fetch_bystring(db, key, key);
 179         if (dbuf.dptr == NULL) {
 180                 TALLOC_FREE(key);
 181                 return false;
 182         }
 183
 184         ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
 185                         &map->gid, &map->sid_name_use,
 186                         &map->nt_name, &map->comment);
 187
 188         TALLOC_FREE(key);
 189
 190         if ( ret == -1 ) {
 191                 DEBUG(3,("get_group_map_from_sid: tdb_unpack failure\n"));
 192                 return false;
 193         }
 194
 195         sid_copy(&map->sid, &sid);
 196
 197         return true;
 198 }
 199
 200 static bool dbrec2map(const struct db_record *rec, GROUP_MAP *map)
 201 {
 202         if ((rec->key.dsize < strlen(GROUP_PREFIX))
 203             || (strncmp((char *)rec->key.dptr, GROUP_PREFIX,
 204                         GROUP_PREFIX_LEN) != 0)) {
 205                 return False;
 206         }
 207
 208         if (!string_to_sid(&map->sid, (const char *)rec->key.dptr
 209                            + GROUP_PREFIX_LEN)) {
 210                 return False;
 211         }
 212
 213         return tdb_unpack(rec->value.dptr, rec->value.dsize, "ddff",
 214                           &map->gid, &map->sid_name_use, &map->nt_name,
 215                           &map->comment) != -1;
 216 }
 217
 218 struct find_map_state {
 219         bool found;
 220         const char *name;       /* If != NULL, look for name */
 221         gid_t gid;              /* valid iff name == NULL */
 222         GROUP_MAP *map;
 223 };
 224
 225 static int find_map(struct db_record *rec, void *private_data)
 226 {
 227         struct find_map_state *state = (struct find_map_state *)private_data;
 228
 229         if (!dbrec2map(rec, state->map)) {
 230                 DEBUG(10, ("failed to unpack map\n"));
 231                 return 0;
 232         }
 233
 234         if (state->name != NULL) {
 235                 if (strequal(state->name, state->map->nt_name)) {
 236                         state->found = true;
 237                         return 1;
 238                 }
 239         }
 240         else {
 241                 if (state->map->gid == state->gid) {
 242                         state->found = true;
 243                         return 1;
 244                 }
 245         }
 246
 247         return 0;
 248 }
 249
 250 /****************************************************************************
 251  Return the sid and the type of the unix group.
 252 ****************************************************************************/
 253
 254 static bool get_group_map_from_gid(gid_t gid, GROUP_MAP *map)
 255 {
 256         struct find_map_state state;
 257
 258         state.found = false;
 259         state.name = NULL;      /* Indicate we're looking for gid */
 260         state.gid = gid;
 261         state.map = map;
 262
 263         db->traverse_read(db, find_map, (void *)&state);
 264
 265         return state.found;
 266 }
 267
 268 /****************************************************************************
 269  Return the sid and the type of the unix group.
 270 ****************************************************************************/
 271
 272 static bool get_group_map_from_ntname(const char *name, GROUP_MAP *map)
 273 {
 274         struct find_map_state state;
 275
 276         state.found = false;
 277         state.name = name;
 278         state.map = map;
 279
 280         db->traverse_read(db, find_map, (void *)&state);
 281
 282         return state.found;
 283 }
 284
 285 /****************************************************************************
 286  Remove a group mapping entry.
 287 ****************************************************************************/
 288
 289 static bool group_map_remove(const DOM_SID *sid)
 290 {
 291         char *key;
 292         NTSTATUS status;
 293
 294         key = group_mapping_key(talloc_tos(), sid);
 295         if (key == NULL) {
 296                 return false;
 297         }
 298
 299         status = dbwrap_trans_delete(db, string_term_tdb_data(key));
 300
 301         TALLOC_FREE(key);
 302         return NT_STATUS_IS_OK(status);
 303 }
 304
 305 /****************************************************************************
 306  Enumerate the group mapping.
 307 ****************************************************************************/
 308
 309 struct enum_map_state {
 310         const DOM_SID *domsid;
 311         enum lsa_SidType sid_name_use;
 312         bool unix_only;
 313
 314         size_t num_maps;
 315         GROUP_MAP *maps;
 316 };
 317
 318 static int collect_map(struct db_record *rec, void *private_data)
 319 {
 320         struct enum_map_state *state = (struct enum_map_state *)private_data;
 321         GROUP_MAP map;
 322         GROUP_MAP *tmp;
 323
 324         if (!dbrec2map(rec, &map)) {
 325                 return 0;
 326         }
 327         /* list only the type or everything if UNKNOWN */
 328         if (state->sid_name_use != SID_NAME_UNKNOWN
 329             && state->sid_name_use != map.sid_name_use) {
 330                 DEBUG(11,("enum_group_mapping: group %s is not of the "
 331                           "requested type\n", map.nt_name));
 332                 return 0;
 333         }
 334
 335         if ((state->unix_only == ENUM_ONLY_MAPPED) && (map.gid == -1)) {
 336                 DEBUG(11,("enum_group_mapping: group %s is non mapped\n",
 337                           map.nt_name));
 338                 return 0;
 339         }
 340
 341         if ((state->domsid != NULL) &&
 342             (sid_compare_domain(state->domsid, &map.sid) != 0)) {
 343                 DEBUG(11,("enum_group_mapping: group %s is not in domain\n",
 344                           sid_string_dbg(&map.sid)));
 345                 return 0;
 346         }
 347
 348         if (!(tmp = SMB_REALLOC_ARRAY(state->maps, GROUP_MAP,
 349                                       state->num_maps+1))) {
 350                 DEBUG(0,("enum_group_mapping: Unable to enlarge group "
 351                          "map!\n"));
 352                 return 1;
 353         }
 354
 355         state->maps = tmp;
 356         state->maps[state->num_maps] = map;
 357         state->num_maps++;
 358         return 0;
 359 }
 360
 361 static bool enum_group_mapping(const DOM_SID *domsid,
 362                                enum lsa_SidType sid_name_use,
 363                                GROUP_MAP **pp_rmap,
 364                                size_t *p_num_entries, bool unix_only)
 365 {
 366         struct enum_map_state state;
 367
 368         state.domsid = domsid;
 369         state.sid_name_use = sid_name_use;
 370         state.unix_only = unix_only;
 371         state.num_maps = 0;
 372         state.maps = NULL;
 373
 374         if (db->traverse_read(db, collect_map, (void *)&state) < 0) {
 375                 return false;
 376         }
 377
 378         *pp_rmap = state.maps;
 379         *p_num_entries = state.num_maps;
 380
 381         return true;
 382 }
 383
 384 /* This operation happens on session setup, so it should better be fast. We
 385  * store a list of aliases a SID is member of hanging off MEMBEROF/SID. */
 386
 387 static NTSTATUS one_alias_membership(const DOM_SID *member,
 388                                DOM_SID **sids, size_t *num)
 389 {
 390         fstring tmp;
 391         fstring key;
 392         char *string_sid;
 393         TDB_DATA dbuf;
 394         const char *p;
 395         NTSTATUS status = NT_STATUS_OK;
 396         TALLOC_CTX *frame = talloc_stackframe();
 397
 398         slprintf(key, sizeof(key), "%s%s", MEMBEROF_PREFIX,
 399                  sid_to_fstring(tmp, member));
 400
 401         dbuf = dbwrap_fetch_bystring(db, frame, key);
 402         if (dbuf.dptr == NULL) {
 403                 TALLOC_FREE(frame);
 404                 return NT_STATUS_OK;
 405         }
 406
 407         p = (const char *)dbuf.dptr;
 408
 409         while (next_token_talloc(frame, &p, &string_sid, " ")) {
 410                 DOM_SID alias;
 411
 412                 if (!string_to_sid(&alias, string_sid))
 413                         continue;
 414
 415                 status= add_sid_to_array_unique(NULL, &alias, sids, num);
 416                 if (!NT_STATUS_IS_OK(status)) {
 417                         goto done;
 418                 }
 419         }
 420
 421 done:
 422         TALLOC_FREE(frame);
 423         return status;
 424 }
 425
 426 static NTSTATUS alias_memberships(const DOM_SID *members, size_t num_members,
 427                                   DOM_SID **sids, size_t *num)
 428 {
 429         size_t i;
 430
 431         *num = 0;
 432         *sids = NULL;
 433
 434         for (i=0; i<num_members; i++) {
 435                 NTSTATUS status = one_alias_membership(&members[i], sids, num);
 436                 if (!NT_STATUS_IS_OK(status))
 437                         return status;
 438         }
 439         return NT_STATUS_OK;
 440 }
 441
 442 static bool is_aliasmem(const DOM_SID *alias, const DOM_SID *member)
 443 {
 444         DOM_SID *sids;
 445         size_t i, num;
 446
 447         /* This feels the wrong way round, but the on-disk data structure
 448          * dictates it this way. */
 449         if (!NT_STATUS_IS_OK(alias_memberships(member, 1, &sids, &num)))
 450                 return False;
 451
 452         for (i=0; i<num; i++) {
 453                 if (sid_compare(alias, &sids[i]) == 0) {
 454                         TALLOC_FREE(sids);
 455                         return True;
 456                 }
 457         }
 458         TALLOC_FREE(sids);
 459         return False;
 460 }
 461
 462
 463 static NTSTATUS add_aliasmem(const DOM_SID *alias, const DOM_SID *member)
 464 {
 465         GROUP_MAP map;
 466         char *key;
 467         fstring string_sid;
 468         char *new_memberstring;
 469         struct db_record *rec;
 470         NTSTATUS status;
 471
 472         if (!get_group_map_from_sid(*alias, &map))
 473                 return NT_STATUS_NO_SUCH_ALIAS;
 474
 475         if ( (map.sid_name_use != SID_NAME_ALIAS) &&
 476              (map.sid_name_use != SID_NAME_WKN_GRP) )
 477                 return NT_STATUS_NO_SUCH_ALIAS;
 478
 479         if (is_aliasmem(alias, member))
 480                 return NT_STATUS_MEMBER_IN_ALIAS;
 481
 482         sid_to_fstring(string_sid, member);
 483
 484         key = talloc_asprintf(talloc_tos(), "%s%s", MEMBEROF_PREFIX,
 485                               string_sid);
 486         if (key == NULL) {
 487                 return NT_STATUS_NO_MEMORY;
 488         }
 489
 490         if (db->transaction_start(db) != 0) {
 491                 DEBUG(0, ("transaction_start failed\n"));
 492                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 493         }
 494
 495         rec = db->fetch_locked(db, key, string_term_tdb_data(key));
 496
 497         if (rec == NULL) {
 498                 DEBUG(10, ("fetch_lock failed\n"));
 499                 TALLOC_FREE(key);
 500                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 501                 goto cancel;
 502         }
 503
 504         sid_to_fstring(string_sid, alias);
 505
 506         if (rec->value.dptr != NULL) {
 507                 new_memberstring = talloc_asprintf(
 508                         key, "%s %s", (char *)(rec->value.dptr), string_sid);
 509         } else {
 510                 new_memberstring = talloc_strdup(key, string_sid);
 511         }
 512
 513         if (new_memberstring == NULL) {
 514                 TALLOC_FREE(key);
 515                 status = NT_STATUS_NO_MEMORY;
 516                 goto cancel;
 517         }
 518
 519         status = rec->store(rec, string_term_tdb_data(new_memberstring), 0);
 520
 521         TALLOC_FREE(key);
 522
 523         if (!NT_STATUS_IS_OK(status)) {
 524                 DEBUG(10, ("Could not store record: %s\n", nt_errstr(status)));
 525                 goto cancel;
 526         }
 527
 528         if (db->transaction_commit(db) != 0) {
 529                 DEBUG(0, ("transaction_commit failed\n"));
 530                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 531                 return status;
 532         }
 533
 534         return NT_STATUS_OK;
 535
 536  cancel:
 537         if (db->transaction_cancel(db) != 0) {
 538                 smb_panic("transaction_cancel failed");
 539         }
 540
 541         return status;
 542 }
 543
 544 struct aliasmem_state {
 545         TALLOC_CTX *mem_ctx;
 546         const DOM_SID *alias;
 547         DOM_SID **sids;
 548         size_t *num;
 549 };
 550
 551 static int collect_aliasmem(struct db_record *rec, void *priv)
 552 {
 553         struct aliasmem_state *state = (struct aliasmem_state *)priv;
 554         const char *p;
 555         char *alias_string;
 556         TALLOC_CTX *frame;
 557
 558         if (strncmp((const char *)rec->key.dptr, MEMBEROF_PREFIX,
 559                     MEMBEROF_PREFIX_LEN) != 0)
 560                 return 0;
 561
 562         p = (const char *)rec->value.dptr;
 563
 564         frame = talloc_stackframe();
 565
 566         while (next_token_talloc(frame, &p, &alias_string, " ")) {
 567                 DOM_SID alias, member;
 568                 const char *member_string;
 569
 570                 if (!string_to_sid(&alias, alias_string))
 571                         continue;
 572
 573                 if (sid_compare(state->alias, &alias) != 0)
 574                         continue;
 575
 576                 /* Ok, we found the alias we're looking for in the membership
 577                  * list currently scanned. The key represents the alias
 578                  * member. Add that. */
 579
 580                 member_string = strchr((const char *)rec->key.dptr, '/');
 581
 582                 /* Above we tested for MEMBEROF_PREFIX which includes the
 583                  * slash. */
 584
 585                 SMB_ASSERT(member_string != NULL);
 586                 member_string += 1;
 587
 588                 if (!string_to_sid(&member, member_string))
 589                         continue;
 590
 591                 if (!NT_STATUS_IS_OK(add_sid_to_array(state->mem_ctx, &member,
 592                                                       state->sids,
 593                                                       state->num)))
 594                 {
 595                         /* talloc fail. */
 596                         break;
 597                 }
 598         }
 599
 600         TALLOC_FREE(frame);
 601         return 0;
 602 }
 603
 604 static NTSTATUS enum_aliasmem(const DOM_SID *alias, TALLOC_CTX *mem_ctx,
 605                               DOM_SID **sids, size_t *num)
 606 {
 607         GROUP_MAP map;
 608         struct aliasmem_state state;
 609
 610         if (!get_group_map_from_sid(*alias, &map))
 611                 return NT_STATUS_NO_SUCH_ALIAS;
 612
 613         if ( (map.sid_name_use != SID_NAME_ALIAS) &&
 614              (map.sid_name_use != SID_NAME_WKN_GRP) )
 615                 return NT_STATUS_NO_SUCH_ALIAS;
 616
 617         *sids = NULL;
 618         *num = 0;
 619
 620         state.alias = alias;
 621         state.sids = sids;
 622         state.num = num;
 623         state.mem_ctx = mem_ctx;
 624
 625         db->traverse_read(db, collect_aliasmem, &state);
 626         return NT_STATUS_OK;
 627 }
 628
 629 static NTSTATUS del_aliasmem(const DOM_SID *alias, const DOM_SID *member)
 630 {
 631         NTSTATUS status;
 632         DOM_SID *sids;
 633         size_t i, num;
 634         bool found = False;
 635         char *member_string;
 636         char *key;
 637         fstring sid_string;
 638
 639         if (db->transaction_start(db) != 0) {
 640                 DEBUG(0, ("transaction_start failed\n"));
 641                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 642         }
 643
 644         status = alias_memberships(member, 1, &sids, &num);
 645
 646         if (!NT_STATUS_IS_OK(status)) {
 647                 goto cancel;
 648         }
 649
 650         for (i=0; i<num; i++) {
 651                 if (sid_compare(&sids[i], alias) == 0) {
 652                         found = True;
 653                         break;
 654                 }
 655         }
 656
 657         if (!found) {
 658                 TALLOC_FREE(sids);
 659                 status = NT_STATUS_MEMBER_NOT_IN_ALIAS;
 660                 goto cancel;
 661         }
 662
 663         if (i < num)
 664                 sids[i] = sids[num-1];
 665
 666         num -= 1;
 667
 668         sid_to_fstring(sid_string, member);
 669
 670         key = talloc_asprintf(sids, "%s%s", MEMBEROF_PREFIX, sid_string);
 671         if (key == NULL) {
 672                 TALLOC_FREE(sids);
 673                 status = NT_STATUS_NO_MEMORY;
 674                 goto cancel;
 675         }
 676
 677         if (num == 0) {
 678                 status = dbwrap_delete_bystring(db, key);
 679                 goto commit;
 680         }
 681
 682         member_string = talloc_strdup(sids, "");
 683         if (member_string == NULL) {
 684                 TALLOC_FREE(sids);
 685                 status = NT_STATUS_NO_MEMORY;
 686                 goto cancel;
 687         }
 688
 689         for (i=0; i<num; i++) {
 690
 691                 sid_to_fstring(sid_string, &sids[i]);
 692
 693                 member_string = talloc_asprintf_append_buffer(
 694                         member_string, " %s", sid_string);
 695
 696                 if (member_string == NULL) {
 697                         TALLOC_FREE(sids);
 698                         status = NT_STATUS_NO_MEMORY;
 699                         goto cancel;
 700                 }
 701         }
 702
 703         status = dbwrap_store_bystring(
 704                 db, key, string_term_tdb_data(member_string), 0);
 705  commit:
 706         TALLOC_FREE(sids);
 707
 708         if (!NT_STATUS_IS_OK(status)) {
 709                 DEBUG(10, ("dbwrap_store_bystring failed: %s\n",
 710                            nt_errstr(status)));
 711                 goto cancel;
 712         }
 713
 714         if (db->transaction_commit(db) != 0) {
 715                 DEBUG(0, ("transaction_commit failed\n"));
 716                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 717                 return status;
 718         }
 719
 720         return NT_STATUS_OK;
 721
 722  cancel:
 723         if (db->transaction_cancel(db) != 0) {
 724                 smb_panic("transaction_cancel failed");
 725         }
 726         return status;
 727 }
 728
 729
 730 /* -- ldb->tdb switching code -------------------------------------------- */
 731
 732 /* change this if the data format ever changes */
 733 #define LTDB_PACKING_FORMAT 0x26011967
 734
 735 /* old packing formats (not supported for now,
 736  * it was never used for group mapping AFAIK) */
 737 #define LTDB_PACKING_FORMAT_NODN 0x26011966
 738
 739 static unsigned int pull_uint32(uint8_t *p, int ofs)
 740 {
 741         p += ofs;
 742         return p[0] | (p[1]<<8) | (p[2]<<16) | (p[3]<<24);
 743 }
 744
 745 /*
 746   unpack a ldb message from a linear buffer in TDB_DATA
 747 */
 748 static int convert_ldb_record(TDB_CONTEXT *ltdb, TDB_DATA key,
 749                               TDB_DATA data, void *ptr)
 750 {
 751         TALLOC_CTX *tmp_ctx = talloc_tos();
 752         GROUP_MAP map;
 753         uint8_t *p;
 754         uint32_t format;
 755         uint32_t num_el;
 756         unsigned int remaining;
 757         unsigned int i, j;
 758         size_t len;
 759         char *name;
 760         char *val;
 761         char *q;
 762         uint32_t num_mem = 0;
 763         DOM_SID *members = NULL;
 764
 765         p = (uint8_t *)data.dptr;
 766         if (data.dsize < 8) {
 767                 errno = EIO;
 768                 goto failed;
 769         }
 770
 771         format = pull_uint32(p, 0);
 772         num_el = pull_uint32(p, 4);
 773         p += 8;
 774
 775         remaining = data.dsize - 8;
 776
 777         switch (format) {
 778         case LTDB_PACKING_FORMAT:
 779                 len = strnlen((char *)p, remaining);
 780                 if (len == remaining) {
 781                         errno = EIO;
 782                         goto failed;
 783                 }
 784
 785                 if (*p == '@') {
 786                         /* ignore special LDB attributes */
 787                         return 0;
 788                 }
 789
 790                 if (strncmp((char *)p, "rid=", 4)) {
 791                         /* unknown entry, ignore */
 792                         DEBUG(3, ("Found unknown entry in group mapping "
 793                                   "database named [%s]\n", (char *)p));
 794                         return 0;
 795                 }
 796
 797                 remaining -= len + 1;
 798                 p += len + 1;
 799                 break;
 800
 801         case LTDB_PACKING_FORMAT_NODN:
 802         default:
 803                 errno = EIO;
 804                 goto failed;
 805         }
 806
 807         if (num_el == 0) {
 808                 /* bad entry, ignore */
 809                 return 0;
 810         }
 811
 812         if (num_el > remaining / 6) {
 813                 errno = EIO;
 814                 goto failed;
 815         }
 816
 817         ZERO_STRUCT(map);
 818
 819         for (i = 0; i < num_el; i++) {
 820                 uint32_t num_vals;
 821
 822                 if (remaining < 10) {
 823                         errno = EIO;
 824                         goto failed;
 825                 }
 826                 len = strnlen((char *)p, remaining - 6);
 827                 if (len == remaining - 6) {
 828                         errno = EIO;
 829                         goto failed;
 830                 }
 831                 name = talloc_strndup(tmp_ctx, (char *)p, len);
 832                 if (name == NULL) {
 833                         errno = ENOMEM;
 834                         goto failed;
 835                 }
 836                 remaining -= len + 1;
 837                 p += len + 1;
 838
 839                 num_vals = pull_uint32(p, 0);
 840                 if (StrCaseCmp(name, "member") == 0) {
 841                         num_mem = num_vals;
 842                         members = talloc_array(tmp_ctx, DOM_SID, num_mem);
 843                         if (members == NULL) {
 844                                 errno = ENOMEM;
 845                                 goto failed;
 846                         }
 847                 } else if (num_vals != 1) {
 848                         errno = EIO;
 849                         goto failed;
 850                 }
 851
 852                 p += 4;
 853                 remaining -= 4;
 854
 855                 for (j = 0; j < num_vals; j++) {
 856                         len = pull_uint32(p, 0);
 857                         if (len > remaining-5) {
 858                                 errno = EIO;
 859                                 goto failed;
 860                         }
 861
 862                         val = talloc_strndup(tmp_ctx, (char *)(p + 4), len);
 863                         if (val == NULL) {
 864                                 errno = ENOMEM;
 865                                 goto failed;
 866                         }
 867
 868                         remaining -= len+4+1;
 869                         p += len+4+1;
 870
 871                         /* we ignore unknown or uninteresting attributes
 872                          * (objectclass, etc.) */
 873                         if (StrCaseCmp(name, "gidNumber") == 0) {
 874                                 map.gid = strtoul(val, &q, 10);
 875                                 if (*q) {
 876                                         errno = EIO;
 877                                         goto failed;
 878                                 }
 879                         } else if (StrCaseCmp(name, "sid") == 0) {
 880                                 if (!string_to_sid(&map.sid, val)) {
 881                                         errno = EIO;
 882                                         goto failed;
 883                                 }
 884                         } else if (StrCaseCmp(name, "sidNameUse") == 0) {
 885                                 map.sid_name_use = strtoul(val, &q, 10);
 886                                 if (*q) {
 887                                         errno = EIO;
 888                                         goto failed;
 889                                 }
 890                         } else if (StrCaseCmp(name, "ntname") == 0) {
 891                                 strlcpy(map.nt_name, val,
 892                                         sizeof(map.nt_name) -1);
 893                         } else if (StrCaseCmp(name, "comment") == 0) {
 894                                 strlcpy(map.comment, val,
 895                                         sizeof(map.comment) -1);
 896                         } else if (StrCaseCmp(name, "member") == 0) {
 897                                 if (!string_to_sid(&members[j], val)) {
 898                                         errno = EIO;
 899                                         goto failed;
 900                                 }
 901                         }
 902
 903                         TALLOC_FREE(val);
 904                 }
 905
 906                 TALLOC_FREE(name);
 907         }
 908
 909         if (!add_mapping_entry(&map, 0)) {
 910                 errno = EIO;
 911                 goto failed;
 912         }
 913
 914         if (num_mem) {
 915                 for (j = 0; j < num_mem; j++) {
 916                         NTSTATUS status;
 917                         status = add_aliasmem(&map.sid, &members[j]);
 918                         if (!NT_STATUS_IS_OK(status)) {
 919                                 errno = EIO;
 920                                 goto failed;
 921                         }
 922                 }
 923         }
 924
 925         if (remaining != 0) {
 926                 DEBUG(0, ("Errror: %d bytes unread in ltdb_unpack_data\n",
 927                           remaining));
 928         }
 929
 930         return 0;
 931
 932 failed:
 933         return -1;
 934 }
 935
 936 static bool mapping_switch(const char *ldb_path)
 937 {
 938         TDB_CONTEXT *ltdb;
 939         TALLOC_CTX *frame;
 940         char *new_path;
 941         int ret;
 942
 943         frame = talloc_stackframe();
 944
 945         ltdb = tdb_open_log(ldb_path, 0, TDB_DEFAULT, O_RDONLY, 0600);
 946         if (ltdb == NULL) goto failed;
 947
 948         /* ldb is just a very fancy tdb, read out raw data and perform
 949          * conversion */
 950         ret = tdb_traverse(ltdb, convert_ldb_record, NULL);
 951         if (ret == -1) goto failed;
 952
 953         if (ltdb) {
 954                 tdb_close(ltdb);
 955                 ltdb = NULL;
 956         }
 957
 958         /* now rename the old db out of the way */
 959         new_path = state_path("group_mapping.ldb.replaced");
 960         if (!new_path) {
 961                 goto failed;
 962         }
 963         if (rename(ldb_path, new_path) != 0) {
 964                 DEBUG(0,("Failed to rename old group mapping database\n"));
 965                 goto failed;
 966         }
 967         TALLOC_FREE(frame);
 968         return True;
 969
 970 failed:
 971         DEBUG(0,("Failed to swith to tdb group mapping database\n"));
 972         if (ltdb) tdb_close(ltdb);
 973         TALLOC_FREE(frame);
 974         return False;
 975 }
 976
 977 static const struct mapping_backend tdb_backend = {
 978         .add_mapping_entry         = add_mapping_entry,
 979         .get_group_map_from_sid    = get_group_map_from_sid,
 980         .get_group_map_from_gid    = get_group_map_from_gid,
 981         .get_group_map_from_ntname = get_group_map_from_ntname,
 982         .group_map_remove          = group_map_remove,
 983         .enum_group_mapping        = enum_group_mapping,
 984         .one_alias_membership      = one_alias_membership,
 985         .add_aliasmem              = add_aliasmem,
 986         .del_aliasmem              = del_aliasmem,
 987         .enum_aliasmem             = enum_aliasmem
 988 };
 989
 990 /*
 991   initialise the tdb mapping backend
 992  */
 993 const struct mapping_backend *groupdb_tdb_init(void)
 994 {
 995         if (!init_group_mapping()) {
 996                 DEBUG(0,("Failed to initialise tdb mapping backend\n"));
 997                 return NULL;
 998         }
 999
1000         return &tdb_backend;
1001 }