1/* 2 * Unix SMB/CIFS implementation. 3 * RPC Pipe client / server routines 4 * Copyright (C) Andrew Tridgell 1992-2006, 5 * Copyright (C) Jean Fran�ois 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 26static struct db_context *db; /* used for driver files */ 27 28static bool enum_group_mapping(const DOM_SID *domsid, enum lsa_SidType sid_name_use, GROUP_MAP **pp_rmap, 29 size_t *p_num_entries, bool unix_only); 30static bool group_map_remove(const DOM_SID *sid); 31 32/**************************************************************************** 33 Open the group mapping tdb. 34****************************************************************************/ 35static bool init_group_mapping(void) 36{ 37 if (db != NULL) { 38 return true; 39 } 40 41 db = db_open(NULL, state_path("group_mapping.tdb"), 0, 42 TDB_DEFAULT, O_RDWR|O_CREAT, 0600); 43 if (db == NULL) { 44 DEBUG(0, ("Failed to open group mapping database: %s\n", 45 strerror(errno))); 46 return false; 47 } 48 49#if 0 50 /* 51 * This code was designed to handle a group mapping version 52 * upgrade. mapping_tdb is not active by default anymore, so ignore 53 * this here. 54 */ 55 { 56 const char *vstring = "INFO/version"; 57 int32 vers_id; 58 GROUP_MAP *map_table = NULL; 59 size_t num_entries = 0; 60 61 /* handle a Samba upgrade */ 62 tdb_lock_bystring(tdb, vstring); 63 64 /* Cope with byte-reversed older versions of the db. */ 65 vers_id = tdb_fetch_int32(tdb, vstring); 66 if ((vers_id == DATABASE_VERSION_V1) 67 || (IREV(vers_id) == DATABASE_VERSION_V1)) { 68 /* 69 * Written on a bigendian machine with old fetch_int 70 * code. Save as le. 71 */ 72 tdb_store_int32(tdb, vstring, DATABASE_VERSION_V2); 73 vers_id = DATABASE_VERSION_V2; 74 } 75 76 /* if its an unknown version we remove everthing in the db */ 77 78 if (vers_id != DATABASE_VERSION_V2) { 79 tdb_wipe_all(tdb); 80 tdb_store_int32(tdb, vstring, DATABASE_VERSION_V2); 81 } 82 83 tdb_unlock_bystring(tdb, vstring); 84 85 /* cleanup any map entries with a gid == -1 */ 86 87 if ( enum_group_mapping( NULL, SID_NAME_UNKNOWN, &map_table, 88 &num_entries, False ) ) { 89 int i; 90 91 for ( i=0; i<num_entries; i++ ) { 92 if ( map_table[i].gid == -1 ) { 93 group_map_remove( &map_table[i].sid ); 94 } 95 } 96 97 SAFE_FREE( map_table ); 98 } 99 } 100#endif 101 102 return true; 103} 104 105static char *group_mapping_key(TALLOC_CTX *mem_ctx, const DOM_SID *sid) 106{ 107 char *sidstr, *result; 108 109 sidstr = sid_string_talloc(talloc_tos(), sid); 110 if (sidstr == NULL) { 111 return NULL; 112 } 113 114 result = talloc_asprintf(mem_ctx, "%s%s", GROUP_PREFIX, sidstr); 115 116 TALLOC_FREE(sidstr); 117 return result; 118} 119 120/**************************************************************************** 121****************************************************************************/ 122static bool add_mapping_entry(GROUP_MAP *map, int flag) 123{ 124 char *key, *buf; 125 int len; 126 NTSTATUS status; 127 128 key = group_mapping_key(talloc_tos(), &map->sid); 129 if (key == NULL) { 130 return false; 131 } 132 133 len = tdb_pack(NULL, 0, "ddff", 134 map->gid, map->sid_name_use, map->nt_name, map->comment); 135 136 buf = TALLOC_ARRAY(key, char, len); 137 if (!buf) { 138 TALLOC_FREE(key); 139 return false; 140 } 141 len = tdb_pack((uint8 *)buf, len, "ddff", map->gid, 142 map->sid_name_use, map->nt_name, map->comment); 143 144 status = dbwrap_trans_store( 145 db, string_term_tdb_data(key), 146 make_tdb_data((uint8_t *)buf, len), TDB_REPLACE); 147 148 TALLOC_FREE(key); 149 150 return NT_STATUS_IS_OK(status); 151} 152 153 154/**************************************************************************** 155 Return the sid and the type of the unix group. 156****************************************************************************/ 157 158static bool get_group_map_from_sid(DOM_SID sid, GROUP_MAP *map) 159{ 160 TDB_DATA dbuf; 161 char *key; 162 int ret = 0; 163 164 /* the key is the SID, retrieving is direct */ 165 166 key = group_mapping_key(talloc_tos(), &sid); 167 if (key == NULL) { 168 return false; 169 } 170 171 dbuf = dbwrap_fetch_bystring(db, key, key); 172 if (dbuf.dptr == NULL) { 173 TALLOC_FREE(key); 174 return false; 175 } 176 177 ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff", 178 &map->gid, &map->sid_name_use, 179 &map->nt_name, &map->comment); 180 181 TALLOC_FREE(key); 182 183 if ( ret == -1 ) { 184 DEBUG(3,("get_group_map_from_sid: tdb_unpack failure\n")); 185 return false; 186 } 187 188 sid_copy(&map->sid, &sid); 189 190 return true; 191} 192 193static bool dbrec2map(const struct db_record *rec, GROUP_MAP *map) 194{ 195 if ((rec->key.dsize < strlen(GROUP_PREFIX)) 196 || (strncmp((char *)rec->key.dptr, GROUP_PREFIX, 197 GROUP_PREFIX_LEN) != 0)) { 198 return False; 199 } 200 201 if (!string_to_sid(&map->sid, (const char *)rec->key.dptr 202 + GROUP_PREFIX_LEN)) { 203 return False; 204 } 205 206 return tdb_unpack(rec->value.dptr, rec->value.dsize, "ddff", 207 &map->gid, &map->sid_name_use, &map->nt_name, 208 &map->comment) != -1; 209} 210 211struct find_map_state { 212 bool found; 213 const char *name; /* If != NULL, look for name */ 214 gid_t gid; /* valid iff name == NULL */ 215 GROUP_MAP *map; 216}; 217 218static int find_map(struct db_record *rec, void *private_data) 219{ 220 struct find_map_state *state = (struct find_map_state *)private_data; 221 222 if (!dbrec2map(rec, state->map)) { 223 DEBUG(10, ("failed to unpack map\n")); 224 return 0; 225 } 226 227 if (state->name != NULL) { 228 if (strequal(state->name, state->map->nt_name)) { 229 state->found = true; 230 return 1; 231 } 232 } 233 else { 234 if (state->map->gid == state->gid) { 235 state->found = true; 236 return 1; 237 } 238 } 239 240 return 0; 241} 242 243/**************************************************************************** 244 Return the sid and the type of the unix group. 245****************************************************************************/ 246 247static bool get_group_map_from_gid(gid_t gid, GROUP_MAP *map) 248{ 249 struct find_map_state state; 250 251 state.found = false; 252 state.name = NULL; /* Indicate we're looking for gid */ 253 state.gid = gid; 254 state.map = map; 255 256 db->traverse_read(db, find_map, (void *)&state); 257 258 return state.found; 259} 260 261/**************************************************************************** 262 Return the sid and the type of the unix group. 263****************************************************************************/ 264 265static bool get_group_map_from_ntname(const char *name, GROUP_MAP *map) 266{ 267 struct find_map_state state; 268 269 state.found = false; 270 state.name = name; 271 state.map = map; 272 273 db->traverse_read(db, find_map, (void *)&state); 274 275 return state.found; 276} 277 278/**************************************************************************** 279 Remove a group mapping entry. 280****************************************************************************/ 281 282static bool group_map_remove(const DOM_SID *sid) 283{ 284 char *key; 285 NTSTATUS status; 286 287 key = group_mapping_key(talloc_tos(), sid); 288 if (key == NULL) { 289 return false; 290 } 291 292 status = dbwrap_trans_delete(db, string_term_tdb_data(key)); 293 294 TALLOC_FREE(key); 295 return NT_STATUS_IS_OK(status); 296} 297 298/**************************************************************************** 299 Enumerate the group mapping. 300****************************************************************************/ 301 302struct enum_map_state { 303 const DOM_SID *domsid; 304 enum lsa_SidType sid_name_use; 305 bool unix_only; 306 307 size_t num_maps; 308 GROUP_MAP *maps; 309}; 310 311static int collect_map(struct db_record *rec, void *private_data) 312{ 313 struct enum_map_state *state = (struct enum_map_state *)private_data; 314 GROUP_MAP map; 315 GROUP_MAP *tmp; 316 317 if (!dbrec2map(rec, &map)) { 318 return 0; 319 } 320 /* list only the type or everything if UNKNOWN */ 321 if (state->sid_name_use != SID_NAME_UNKNOWN 322 && state->sid_name_use != map.sid_name_use) { 323 DEBUG(11,("enum_group_mapping: group %s is not of the " 324 "requested type\n", map.nt_name)); 325 return 0; 326 } 327 328 if ((state->unix_only == ENUM_ONLY_MAPPED) && (map.gid == -1)) { 329 DEBUG(11,("enum_group_mapping: group %s is non mapped\n", 330 map.nt_name)); 331 return 0; 332 } 333 334 if ((state->domsid != NULL) && 335 (sid_compare_domain(state->domsid, &map.sid) != 0)) { 336 DEBUG(11,("enum_group_mapping: group %s is not in domain\n", 337 sid_string_dbg(&map.sid))); 338 return 0; 339 } 340 341 if (!(tmp = SMB_REALLOC_ARRAY(state->maps, GROUP_MAP, 342 state->num_maps+1))) { 343 DEBUG(0,("enum_group_mapping: Unable to enlarge group " 344 "map!\n")); 345 return 1; 346 } 347 348 state->maps = tmp; 349 state->maps[state->num_maps] = map; 350 state->num_maps++; 351 return 0; 352} 353 354static bool enum_group_mapping(const DOM_SID *domsid, 355 enum lsa_SidType sid_name_use, 356 GROUP_MAP **pp_rmap, 357 size_t *p_num_entries, bool unix_only) 358{ 359 struct enum_map_state state; 360 361 state.domsid = domsid; 362 state.sid_name_use = sid_name_use; 363 state.unix_only = unix_only; 364 state.num_maps = 0; 365 state.maps = NULL; 366 367 if (db->traverse_read(db, collect_map, (void *)&state) < 0) { 368 return false; 369 } 370 371 *pp_rmap = state.maps; 372 *p_num_entries = state.num_maps; 373 374 return true; 375} 376 377/* This operation happens on session setup, so it should better be fast. We 378 * store a list of aliases a SID is member of hanging off MEMBEROF/SID. */ 379 380static NTSTATUS one_alias_membership(const DOM_SID *member, 381 DOM_SID **sids, size_t *num) 382{ 383 fstring tmp; 384 fstring key; 385 char *string_sid; 386 TDB_DATA dbuf; 387 const char *p; 388 NTSTATUS status = NT_STATUS_OK; 389 TALLOC_CTX *frame = talloc_stackframe(); 390 391 slprintf(key, sizeof(key), "%s%s", MEMBEROF_PREFIX, 392 sid_to_fstring(tmp, member)); 393 394 dbuf = dbwrap_fetch_bystring(db, frame, key); 395 if (dbuf.dptr == NULL) { 396 TALLOC_FREE(frame); 397 return NT_STATUS_OK; 398 } 399 400 p = (const char *)dbuf.dptr; 401 402 while (next_token_talloc(frame, &p, &string_sid, " ")) { 403 DOM_SID alias; 404 405 if (!string_to_sid(&alias, string_sid)) 406 continue; 407 408 status= add_sid_to_array_unique(NULL, &alias, sids, num); 409 if (!NT_STATUS_IS_OK(status)) { 410 goto done; 411 } 412 } 413 414done: 415 TALLOC_FREE(frame); 416 return status; 417} 418 419static NTSTATUS alias_memberships(const DOM_SID *members, size_t num_members, 420 DOM_SID **sids, size_t *num) 421{ 422 size_t i; 423 424 *num = 0; 425 *sids = NULL; 426 427 for (i=0; i<num_members; i++) { 428 NTSTATUS status = one_alias_membership(&members[i], sids, num); 429 if (!NT_STATUS_IS_OK(status)) 430 return status; 431 } 432 return NT_STATUS_OK; 433} 434 435static bool is_aliasmem(const DOM_SID *alias, const DOM_SID *member) 436{ 437 DOM_SID *sids; 438 size_t i, num; 439 440 /* This feels the wrong way round, but the on-disk data structure 441 * dictates it this way. */ 442 if (!NT_STATUS_IS_OK(alias_memberships(member, 1, &sids, &num))) 443 return False; 444 445 for (i=0; i<num; i++) { 446 if (sid_compare(alias, &sids[i]) == 0) { 447 TALLOC_FREE(sids); 448 return True; 449 } 450 } 451 TALLOC_FREE(sids); 452 return False; 453} 454 455 456static NTSTATUS add_aliasmem(const DOM_SID *alias, const DOM_SID *member) 457{ 458 GROUP_MAP map; 459 char *key; 460 fstring string_sid; 461 char *new_memberstring; 462 struct db_record *rec; 463 NTSTATUS status; 464 465 if (!get_group_map_from_sid(*alias, &map)) 466 return NT_STATUS_NO_SUCH_ALIAS; 467 468 if ( (map.sid_name_use != SID_NAME_ALIAS) && 469 (map.sid_name_use != SID_NAME_WKN_GRP) ) 470 return NT_STATUS_NO_SUCH_ALIAS; 471 472 if (is_aliasmem(alias, member)) 473 return NT_STATUS_MEMBER_IN_ALIAS; 474 475 sid_to_fstring(string_sid, member); 476 477 key = talloc_asprintf(talloc_tos(), "%s%s", MEMBEROF_PREFIX, 478 string_sid); 479 if (key == NULL) { 480 return NT_STATUS_NO_MEMORY; 481 } 482 483 if (db->transaction_start(db) != 0) { 484 DEBUG(0, ("transaction_start failed\n")); 485 return NT_STATUS_INTERNAL_DB_CORRUPTION; 486 } 487 488 rec = db->fetch_locked(db, key, string_term_tdb_data(key)); 489 490 if (rec == NULL) { 491 DEBUG(10, ("fetch_lock failed\n")); 492 TALLOC_FREE(key); 493 status = NT_STATUS_INTERNAL_DB_CORRUPTION; 494 goto cancel; 495 } 496 497 sid_to_fstring(string_sid, alias); 498 499 if (rec->value.dptr != NULL) { 500 new_memberstring = talloc_asprintf( 501 key, "%s %s", (char *)(rec->value.dptr), string_sid); 502 } else { 503 new_memberstring = talloc_strdup(key, string_sid); 504 } 505 506 if (new_memberstring == NULL) { 507 TALLOC_FREE(key); 508 status = NT_STATUS_NO_MEMORY; 509 goto cancel; 510 } 511 512 status = rec->store(rec, string_term_tdb_data(new_memberstring), 0); 513 514 TALLOC_FREE(key); 515 516 if (!NT_STATUS_IS_OK(status)) { 517 DEBUG(10, ("Could not store record: %s\n", nt_errstr(status))); 518 goto cancel; 519 } 520 521 if (db->transaction_commit(db) != 0) { 522 DEBUG(0, ("transaction_commit failed\n")); 523 status = NT_STATUS_INTERNAL_DB_CORRUPTION; 524 return status; 525 } 526 527 return NT_STATUS_OK; 528 529 cancel: 530 if (db->transaction_cancel(db) != 0) { 531 smb_panic("transaction_cancel failed"); 532 } 533 534 return status; 535} 536 537struct aliasmem_state { 538 TALLOC_CTX *mem_ctx; 539 const DOM_SID *alias; 540 DOM_SID **sids; 541 size_t *num; 542}; 543 544static int collect_aliasmem(struct db_record *rec, void *priv) 545{ 546 struct aliasmem_state *state = (struct aliasmem_state *)priv; 547 const char *p; 548 char *alias_string; 549 TALLOC_CTX *frame; 550 551 if (strncmp((const char *)rec->key.dptr, MEMBEROF_PREFIX, 552 MEMBEROF_PREFIX_LEN) != 0) 553 return 0; 554 555 p = (const char *)rec->value.dptr; 556 557 frame = talloc_stackframe(); 558 559 while (next_token_talloc(frame, &p, &alias_string, " ")) { 560 DOM_SID alias, member; 561 const char *member_string; 562 563 if (!string_to_sid(&alias, alias_string)) 564 continue; 565 566 if (sid_compare(state->alias, &alias) != 0) 567 continue; 568 569 /* Ok, we found the alias we're looking for in the membership 570 * list currently scanned. The key represents the alias 571 * member. Add that. */ 572 573 member_string = strchr((const char *)rec->key.dptr, '/'); 574 575 /* Above we tested for MEMBEROF_PREFIX which includes the 576 * slash. */ 577 578 SMB_ASSERT(member_string != NULL); 579 member_string += 1; 580 581 if (!string_to_sid(&member, member_string)) 582 continue; 583 584 if (!NT_STATUS_IS_OK(add_sid_to_array(state->mem_ctx, &member, 585 state->sids, 586 state->num))) 587 { 588 /* talloc fail. */ 589 break; 590 } 591 } 592 593 TALLOC_FREE(frame); 594 return 0; 595} 596 597static NTSTATUS enum_aliasmem(const DOM_SID *alias, TALLOC_CTX *mem_ctx, 598 DOM_SID **sids, size_t *num) 599{ 600 GROUP_MAP map; 601 struct aliasmem_state state; 602 603 if (!get_group_map_from_sid(*alias, &map)) 604 return NT_STATUS_NO_SUCH_ALIAS; 605 606 if ( (map.sid_name_use != SID_NAME_ALIAS) && 607 (map.sid_name_use != SID_NAME_WKN_GRP) ) 608 return NT_STATUS_NO_SUCH_ALIAS; 609 610 *sids = NULL; 611 *num = 0; 612 613 state.alias = alias; 614 state.sids = sids; 615 state.num = num; 616 state.mem_ctx = mem_ctx; 617 618 db->traverse_read(db, collect_aliasmem, &state); 619 return NT_STATUS_OK; 620} 621 622static NTSTATUS del_aliasmem(const DOM_SID *alias, const DOM_SID *member) 623{ 624 NTSTATUS status; 625 DOM_SID *sids; 626 size_t i, num; 627 bool found = False; 628 char *member_string; 629 char *key; 630 fstring sid_string; 631 632 if (db->transaction_start(db) != 0) { 633 DEBUG(0, ("transaction_start failed\n")); 634 return NT_STATUS_INTERNAL_DB_CORRUPTION; 635 } 636 637 status = alias_memberships(member, 1, &sids, &num); 638 639 if (!NT_STATUS_IS_OK(status)) { 640 goto cancel; 641 } 642 643 for (i=0; i<num; i++) { 644 if (sid_compare(&sids[i], alias) == 0) { 645 found = True; 646 break; 647 } 648 } 649 650 if (!found) { 651 TALLOC_FREE(sids); 652 status = NT_STATUS_MEMBER_NOT_IN_ALIAS; 653 goto cancel; 654 } 655 656 if (i < num) 657 sids[i] = sids[num-1]; 658 659 num -= 1; 660 661 sid_to_fstring(sid_string, member); 662 663 key = talloc_asprintf(sids, "%s%s", MEMBEROF_PREFIX, sid_string); 664 if (key == NULL) { 665 TALLOC_FREE(sids); 666 status = NT_STATUS_NO_MEMORY; 667 goto cancel; 668 } 669 670 if (num == 0) { 671 status = dbwrap_delete_bystring(db, key); 672 goto commit; 673 } 674 675 member_string = talloc_strdup(sids, ""); 676 if (member_string == NULL) { 677 TALLOC_FREE(sids); 678 status = NT_STATUS_NO_MEMORY; 679 goto cancel; 680 } 681 682 for (i=0; i<num; i++) { 683 684 sid_to_fstring(sid_string, &sids[i]); 685 686 member_string = talloc_asprintf_append_buffer( 687 member_string, " %s", sid_string); 688 689 if (member_string == NULL) { 690 TALLOC_FREE(sids); 691 status = NT_STATUS_NO_MEMORY; 692 goto cancel; 693 } 694 } 695 696 status = dbwrap_store_bystring( 697 db, key, string_term_tdb_data(member_string), 0); 698 commit: 699 TALLOC_FREE(sids); 700 701 if (!NT_STATUS_IS_OK(status)) { 702 DEBUG(10, ("dbwrap_store_bystring failed: %s\n", 703 nt_errstr(status))); 704 goto cancel; 705 } 706 707 if (db->transaction_commit(db) != 0) { 708 DEBUG(0, ("transaction_commit failed\n")); 709 status = NT_STATUS_INTERNAL_DB_CORRUPTION; 710 return status; 711 } 712 713 return NT_STATUS_OK; 714 715 cancel: 716 if (db->transaction_cancel(db) != 0) { 717 smb_panic("transaction_cancel failed"); 718 } 719 return status; 720} 721 722static const struct mapping_backend tdb_backend = { 723 .add_mapping_entry = add_mapping_entry, 724 .get_group_map_from_sid = get_group_map_from_sid, 725 .get_group_map_from_gid = get_group_map_from_gid, 726 .get_group_map_from_ntname = get_group_map_from_ntname, 727 .group_map_remove = group_map_remove, 728 .enum_group_mapping = enum_group_mapping, 729 .one_alias_membership = one_alias_membership, 730 .add_aliasmem = add_aliasmem, 731 .del_aliasmem = del_aliasmem, 732 .enum_aliasmem = enum_aliasmem 733}; 734 735/* 736 initialise the tdb mapping backend 737 */ 738const struct mapping_backend *groupdb_tdb_init(void) 739{ 740 if (!init_group_mapping()) { 741 DEBUG(0,("Failed to initialise tdb mapping backend\n")); 742 return NULL; 743 } 744 745 return &tdb_backend; 746} 747