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vfs_io_uring: move error handling out of vfs_io_uring_pread_recv()
[Samba.git] / source3 / groupdb / mapping_tdb.c
blob7f6ae4e65e4cf64dc48fd3b188ab9b6b817f7998
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 "system/filesys.h"
25 #include "passdb.h"
26 #include "groupdb/mapping.h"
27 #include "dbwrap/dbwrap.h"
28 #include "dbwrap/dbwrap_open.h"
29 #include "util_tdb.h"
30 #include "../libcli/security/security.h"
31 #include "groupdb/mapping_tdb.h"
32
33 static struct db_context *db; /* used for driver files */
34
35 static bool enum_group_mapping(const struct dom_sid *domsid,
36 enum lsa_SidType sid_name_use,
37 GROUP_MAP ***pp_rmap,
38 size_t *p_num_entries,
39 bool unix_only);
40 static bool group_map_remove(const struct dom_sid *sid);
41
42 static bool mapping_switch(const char *ldb_path);
43
44 /****************************************************************************
45 Open the group mapping tdb.
46 ****************************************************************************/
47 static bool init_group_mapping(void)
48 {
49 char *tdb_path;
50 char *ldb_path;
51
52 if (db != NULL) {
53 return true;
54 }
55
56 tdb_path = state_path(talloc_tos(), "group_mapping.tdb");
57 if (tdb_path == NULL) {
58 return false;
59 }
60 db = db_open(NULL, tdb_path, 0,
61 TDB_DEFAULT, O_RDWR|O_CREAT, 0600,
62 DBWRAP_LOCK_ORDER_1, DBWRAP_FLAG_NONE);
63 if (db == NULL) {
64 DEBUG(0, ("Failed to open group mapping database: %s\n",
65 strerror(errno)));
66 talloc_free(tdb_path);
67 return false;
68 }
69
70 ldb_path = state_path(talloc_tos(), "group_mapping.ldb");
71 if (ldb_path == NULL) {
72 talloc_free(tdb_path);
73 return false;
74 }
75 if (file_exist(ldb_path) && !mapping_switch(ldb_path)) {
76 unlink(tdb_path);
77 talloc_free(tdb_path);
78 talloc_free(ldb_path);
79 return false;
80
81 } else {
82 /* handle upgrade from old versions of the database */
83 #if 0 /* -- Needs conversion to dbwrap -- */
84 const char *vstring = "INFO/version";
85 int32 vers_id;
86 GROUP_MAP *map_table = NULL;
87 size_t num_entries = 0;
88
89 /* handle a Samba upgrade */
90 tdb_lock_bystring(tdb, vstring);
91
92 /* Cope with byte-reversed older versions of the db. */
93 vers_id = tdb_fetch_int32(tdb, vstring);
94 if ((vers_id == DATABASE_VERSION_V1)
95 || (IREV(vers_id) == DATABASE_VERSION_V1)) {
96 /*
97 * Written on a bigendian machine with old fetch_int
98 * code. Save as le.
99 */
100 tdb_store_int32(tdb, vstring, DATABASE_VERSION_V2);
101 vers_id = DATABASE_VERSION_V2;
102 }
103
104 /* if its an unknown version we remove everything in the db */
105
106 if (vers_id != DATABASE_VERSION_V2) {
107 tdb_wipe_all(tdb);
108 tdb_store_int32(tdb, vstring, DATABASE_VERSION_V2);
109 }
110
111 tdb_unlock_bystring(tdb, vstring);
112
113 /* cleanup any map entries with a gid == -1 */
114
115 if ( enum_group_mapping( NULL, SID_NAME_UNKNOWN, &map_table,
116 &num_entries, False ) ) {
117 int i;
118
119 for ( i=0; i<num_entries; i++ ) {
120 if ( map_table[i].gid == -1 ) {
121 group_map_remove( &map_table[i].sid );
122 }
123 }
124
125 SAFE_FREE( map_table );
126 }
127 #endif
128 }
129 talloc_free(tdb_path);
130 talloc_free(ldb_path);
131 return true;
132 }
133
134 static char *group_mapping_key(TALLOC_CTX *mem_ctx, const struct dom_sid *sid)
135 {
136 struct dom_sid_buf sidstr;
137
138 return talloc_asprintf(
139 mem_ctx, "%s%s", GROUP_PREFIX, dom_sid_str_buf(sid, &sidstr));
140 }
141
142 /****************************************************************************
143 ****************************************************************************/
144 static bool add_mapping_entry(GROUP_MAP *map, int flag)
145 {
146 char *key, *buf;
147 int len;
148 NTSTATUS status;
149
150 key = group_mapping_key(talloc_tos(), &map->sid);
151 if (key == NULL) {
152 return false;
153 }
154
155 len = tdb_pack(NULL, 0, "ddff",
156 map->gid, map->sid_name_use, map->nt_name, map->comment);
157
158 buf = talloc_array(key, char, len);
159 if (!buf) {
160 TALLOC_FREE(key);
161 return false;
162 }
163 len = tdb_pack((uint8_t *)buf, len, "ddff", map->gid,
164 map->sid_name_use, map->nt_name, map->comment);
165
166 status = dbwrap_trans_store(
167 db, string_term_tdb_data(key),
168 make_tdb_data((uint8_t *)buf, len), TDB_REPLACE);
169
170 TALLOC_FREE(key);
171
172 return NT_STATUS_IS_OK(status);
173 }
174
175
176 /****************************************************************************
177 Return the sid and the type of the unix group.
178 ****************************************************************************/
179
180 static bool get_group_map_from_sid(struct dom_sid sid, GROUP_MAP *map)
181 {
182 TDB_DATA dbuf;
183 char *key;
184 int ret = 0;
185 NTSTATUS status;
186 fstring nt_name;
187 fstring comment;
188
189 /* the key is the SID, retrieving is direct */
190
191 key = group_mapping_key(talloc_tos(), &sid);
192 if (key == NULL) {
193 return false;
194 }
195
196 status = dbwrap_fetch_bystring(db, key, key, &dbuf);
197 if (!NT_STATUS_IS_OK(status)) {
198 TALLOC_FREE(key);
199 return false;
200 }
201
202 ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
203 &map->gid, &map->sid_name_use,
204 &nt_name, &comment);
205
206 TALLOC_FREE(key);
207
208 if ( ret == -1 ) {
209 DEBUG(3,("get_group_map_from_sid: tdb_unpack failure\n"));
210 return false;
211 }
212
213 sid_copy(&map->sid, &sid);
214
215 map->nt_name = talloc_strdup(map, nt_name);
216 if (!map->nt_name) {
217 return false;
218 }
219 map->comment = talloc_strdup(map, comment);
220 if (!map->comment) {
221 return false;
222 }
223
224 return true;
225 }
226
227 static bool dbrec2map(const struct db_record *rec, GROUP_MAP *map)
228 {
229 TDB_DATA key = dbwrap_record_get_key(rec);
230 TDB_DATA value = dbwrap_record_get_value(rec);
231 int ret = 0;
232 fstring nt_name;
233 fstring comment;
234
235 if ((key.dsize < strlen(GROUP_PREFIX))
236 || (strncmp((char *)key.dptr, GROUP_PREFIX,
237 GROUP_PREFIX_LEN) != 0)) {
238 return False;
239 }
240
241 if (!string_to_sid(&map->sid, (const char *)key.dptr
242 + GROUP_PREFIX_LEN)) {
243 return False;
244 }
245
246 ret = tdb_unpack(value.dptr, value.dsize, "ddff",
247 &map->gid, &map->sid_name_use,
248 &nt_name, &comment);
249
250 if (ret == -1) {
251 DEBUG(3, ("dbrec2map: tdb_unpack failure\n"));
252 return false;
253 }
254
255 map->nt_name = talloc_strdup(map, nt_name);
256 if (!map->nt_name) {
257 return false;
258 }
259 map->comment = talloc_strdup(map, comment);
260 if (!map->comment) {
261 return false;
262 }
263
264 return true;
265 }
266
267 struct find_map_state {
268 bool found;
269 const char *name; /* If != NULL, look for name */
270 gid_t gid; /* valid iff name == NULL */
271 GROUP_MAP *map;
272 };
273
274 static int find_map(struct db_record *rec, void *private_data)
275 {
276 struct find_map_state *state = (struct find_map_state *)private_data;
277
278 if (!dbrec2map(rec, state->map)) {
279 DEBUG(10, ("failed to unpack map\n"));
280 return 0;
281 }
282
283 if (state->name != NULL) {
284 if (strequal(state->name, state->map->nt_name)) {
285 state->found = true;
286 return 1;
287 }
288 }
289 else {
290 if (state->map->gid == state->gid) {
291 state->found = true;
292 return 1;
293 }
294 }
295
296 return 0;
297 }
298
299 /****************************************************************************
300 Return the sid and the type of the unix group.
301 ****************************************************************************/
302
303 static bool get_group_map_from_gid(gid_t gid, GROUP_MAP *map)
304 {
305 struct find_map_state state;
306
307 state.found = false;
308 state.name = NULL; /* Indicate we're looking for gid */
309 state.gid = gid;
310 state.map = map;
311
312 dbwrap_traverse_read(db, find_map, (void *)&state, NULL);
313
314 return state.found;
315 }
316
317 /****************************************************************************
318 Return the sid and the type of the unix group.
319 ****************************************************************************/
320
321 static bool get_group_map_from_ntname(const char *name, GROUP_MAP *map)
322 {
323 struct find_map_state state;
324
325 state.found = false;
326 state.name = name;
327 state.map = map;
328
329 dbwrap_traverse_read(db, find_map, (void *)&state, NULL);
330
331 return state.found;
332 }
333
334 /****************************************************************************
335 Remove a group mapping entry.
336 ****************************************************************************/
337
338 static bool group_map_remove(const struct dom_sid *sid)
339 {
340 char *key;
341 NTSTATUS status;
342
343 key = group_mapping_key(talloc_tos(), sid);
344 if (key == NULL) {
345 return false;
346 }
347
348 status = dbwrap_trans_delete(db, string_term_tdb_data(key));
349
350 TALLOC_FREE(key);
351 return NT_STATUS_IS_OK(status);
352 }
353
354 /****************************************************************************
355 Enumerate the group mapping.
356 ****************************************************************************/
357
358 struct enum_map_state {
359 const struct dom_sid *domsid;
360 enum lsa_SidType sid_name_use;
361 bool unix_only;
362
363 size_t num_maps;
364 GROUP_MAP **maps;
365 };
366
367 static int collect_map(struct db_record *rec, void *private_data)
368 {
369 struct enum_map_state *state = (struct enum_map_state *)private_data;
370 GROUP_MAP *map;
371 GROUP_MAP **tmp;
372
373 map = talloc_zero(NULL, GROUP_MAP);
374 if (!map) {
375 DEBUG(0, ("Unable to allocate group map!\n"));
376 return 1;
377 }
378
379 if (!dbrec2map(rec, map)) {
380 TALLOC_FREE(map);
381 return 0;
382 }
383 /* list only the type or everything if UNKNOWN */
384 if (state->sid_name_use != SID_NAME_UNKNOWN
385 && state->sid_name_use != map->sid_name_use) {
386 DEBUG(11,("enum_group_mapping: group %s is not of the "
387 "requested type\n", map->nt_name));
388 TALLOC_FREE(map);
389 return 0;
390 }
391
392 if ((state->unix_only == ENUM_ONLY_MAPPED) && (map->gid == -1)) {
393 DEBUG(11,("enum_group_mapping: group %s is non mapped\n",
394 map->nt_name));
395 TALLOC_FREE(map);
396 return 0;
397 }
398
399 if ((state->domsid != NULL) &&
400 (dom_sid_compare_domain(state->domsid, &map->sid) != 0)) {
401 struct dom_sid_buf buf;
402 DEBUG(11,("enum_group_mapping: group %s is not in domain\n",
403 dom_sid_str_buf(&map->sid, &buf)));
404 TALLOC_FREE(map);
405 return 0;
406 }
407
408 tmp = talloc_realloc(NULL, state->maps, GROUP_MAP *,
409 state->num_maps + 1);
410 if (!tmp) {
411 DEBUG(0,("enum_group_mapping: Unable to enlarge group "
412 "map!\n"));
413 TALLOC_FREE(map);
414 return 1;
415 }
416
417 state->maps = tmp;
418 state->maps[state->num_maps] = talloc_move(state->maps, &map);
419 state->num_maps++;
420 return 0;
421 }
422
423 static bool enum_group_mapping(const struct dom_sid *domsid,
424 enum lsa_SidType sid_name_use,
425 GROUP_MAP ***pp_rmap,
426 size_t *p_num_entries, bool unix_only)
427 {
428 struct enum_map_state state;
429 NTSTATUS status;
430
431 state.domsid = domsid;
432 state.sid_name_use = sid_name_use;
433 state.unix_only = unix_only;
434 state.num_maps = 0;
435 state.maps = NULL;
436
437 status = dbwrap_traverse_read(db, collect_map, (void *)&state, NULL);
438 if (!NT_STATUS_IS_OK(status)) {
439 TALLOC_FREE(state.maps);
440 return false;
441 }
442
443 *pp_rmap = state.maps;
444 *p_num_entries = state.num_maps;
445
446 return true;
447 }
448
449 /* This operation happens on session setup, so it should better be fast. We
450 * store a list of aliases a SID is member of hanging off MEMBEROF/SID. */
451
452 static NTSTATUS one_alias_membership(const struct dom_sid *member,
453 struct dom_sid **sids, size_t *num)
454 {
455 struct dom_sid_buf tmp;
456 fstring key;
457 char *string_sid;
458 TDB_DATA dbuf;
459 const char *p;
460 NTSTATUS status;
461 TALLOC_CTX *frame = talloc_stackframe();
462
463 slprintf(key, sizeof(key), "%s%s", MEMBEROF_PREFIX,
464 dom_sid_str_buf(member, &tmp));
465
466 status = dbwrap_fetch_bystring(db, frame, key, &dbuf);
467 if (!NT_STATUS_IS_OK(status)) {
468 TALLOC_FREE(frame);
469 return NT_STATUS_OK;
470 }
471
472 p = (const char *)dbuf.dptr;
473
474 while (next_token_talloc(frame, &p, &string_sid, " ")) {
475 struct dom_sid alias;
476 uint32_t num_sids;
477
478 if (!string_to_sid(&alias, string_sid))
479 continue;
480
481 num_sids = *num;
482 status= add_sid_to_array_unique(NULL, &alias, sids, &num_sids);
483 if (!NT_STATUS_IS_OK(status)) {
484 goto done;
485 }
486 *num = num_sids;
487 }
488
489 done:
490 TALLOC_FREE(frame);
491 return status;
492 }
493
494 static NTSTATUS alias_memberships(const struct dom_sid *members, size_t num_members,
495 struct dom_sid **sids, size_t *num)
496 {
497 size_t i;
498
499 *num = 0;
500 *sids = NULL;
501
502 for (i=0; i<num_members; i++) {
503 NTSTATUS status = one_alias_membership(&members[i], sids, num);
504 if (!NT_STATUS_IS_OK(status))
505 return status;
506 }
507 return NT_STATUS_OK;
508 }
509
510 static bool is_aliasmem(const struct dom_sid *alias, const struct dom_sid *member)
511 {
512 struct dom_sid *sids;
513 size_t i;
514 size_t num;
515
516 /* This feels the wrong way round, but the on-disk data structure
517 * dictates it this way. */
518 if (!NT_STATUS_IS_OK(alias_memberships(member, 1, &sids, &num)))
519 return False;
520
521 for (i=0; i<num; i++) {
522 if (dom_sid_compare(alias, &sids[i]) == 0) {
523 TALLOC_FREE(sids);
524 return True;
525 }
526 }
527 TALLOC_FREE(sids);
528 return False;
529 }
530
531
532 static NTSTATUS add_aliasmem(const struct dom_sid *alias, const struct dom_sid *member)
533 {
534 GROUP_MAP *map;
535 char *key;
536 struct dom_sid_buf string_sid;
537 char *new_memberstring;
538 struct db_record *rec;
539 NTSTATUS status;
540 TDB_DATA value;
541
542 map = talloc_zero(talloc_tos(), GROUP_MAP);
543 if (!map) {
544 return NT_STATUS_NO_MEMORY;
545 }
546
547 if (!get_group_map_from_sid(*alias, map)) {
548 TALLOC_FREE(map);
549 return NT_STATUS_NO_SUCH_ALIAS;
550 }
551
552 if ((map->sid_name_use != SID_NAME_ALIAS) &&
553 (map->sid_name_use != SID_NAME_WKN_GRP)) {
554 TALLOC_FREE(map);
555 return NT_STATUS_NO_SUCH_ALIAS;
556 }
557
558 TALLOC_FREE(map);
559
560 if (is_aliasmem(alias, member))
561 return NT_STATUS_MEMBER_IN_ALIAS;
562
563 key = talloc_asprintf(talloc_tos(), "%s%s", MEMBEROF_PREFIX,
564 dom_sid_str_buf(member, &string_sid));
565 if (key == NULL) {
566 return NT_STATUS_NO_MEMORY;
567 }
568
569 if (dbwrap_transaction_start(db) != 0) {
570 DEBUG(0, ("transaction_start failed\n"));
571 return NT_STATUS_INTERNAL_DB_CORRUPTION;
572 }
573
574 rec = dbwrap_fetch_locked(db, key, string_term_tdb_data(key));
575
576 if (rec == NULL) {
577 DEBUG(10, ("fetch_lock failed\n"));
578 TALLOC_FREE(key);
579 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
580 goto cancel;
581 }
582
583 value = dbwrap_record_get_value(rec);
584
585 dom_sid_str_buf(alias, &string_sid);
586
587 if (value.dptr != NULL) {
588 new_memberstring = talloc_asprintf(
589 key, "%s %s", (char *)(value.dptr), string_sid.buf);
590 } else {
591 new_memberstring = talloc_strdup(key, string_sid.buf);
592 }
593
594 if (new_memberstring == NULL) {
595 TALLOC_FREE(key);
596 status = NT_STATUS_NO_MEMORY;
597 goto cancel;
598 }
599
600 status = dbwrap_record_store(rec, string_term_tdb_data(new_memberstring), 0);
601
602 TALLOC_FREE(key);
603
604 if (!NT_STATUS_IS_OK(status)) {
605 DEBUG(10, ("Could not store record: %s\n", nt_errstr(status)));
606 goto cancel;
607 }
608
609 if (dbwrap_transaction_commit(db) != 0) {
610 DEBUG(0, ("transaction_commit failed\n"));
611 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
612 return status;
613 }
614
615 return NT_STATUS_OK;
616
617 cancel:
618 if (dbwrap_transaction_cancel(db) != 0) {
619 smb_panic("transaction_cancel failed");
620 }
621
622 return status;
623 }
624
625 struct aliasmem_state {
626 TALLOC_CTX *mem_ctx;
627 const struct dom_sid *alias;
628 struct dom_sid **sids;
629 size_t *num;
630 };
631
632 static int collect_aliasmem(struct db_record *rec, void *priv)
633 {
634 struct aliasmem_state *state = (struct aliasmem_state *)priv;
635 const char *p;
636 char *alias_string;
637 TALLOC_CTX *frame;
638 TDB_DATA key = dbwrap_record_get_key(rec);
639 TDB_DATA value = dbwrap_record_get_value(rec);
640
641 if (strncmp((const char *)key.dptr, MEMBEROF_PREFIX,
642 MEMBEROF_PREFIX_LEN) != 0)
643 return 0;
644
645 p = (const char *)value.dptr;
646
647 frame = talloc_stackframe();
648
649 while (next_token_talloc(frame, &p, &alias_string, " ")) {
650 struct dom_sid alias, member;
651 const char *member_string;
652 uint32_t num_sids;
653
654 if (!string_to_sid(&alias, alias_string))
655 continue;
656
657 if (dom_sid_compare(state->alias, &alias) != 0)
658 continue;
659
660 /* Ok, we found the alias we're looking for in the membership
661 * list currently scanned. The key represents the alias
662 * member. Add that. */
663
664 member_string = strchr((const char *)key.dptr, '/');
665
666 /* Above we tested for MEMBEROF_PREFIX which includes the
667 * slash. */
668
669 SMB_ASSERT(member_string != NULL);
670 member_string += 1;
671
672 if (!string_to_sid(&member, member_string))
673 continue;
674
675 num_sids = *state->num;
676 if (!NT_STATUS_IS_OK(add_sid_to_array(state->mem_ctx, &member,
677 state->sids,
678 &num_sids)))
679 {
680 /* talloc fail. */
681 break;
682 }
683 *state->num = num_sids;
684 }
685
686 TALLOC_FREE(frame);
687 return 0;
688 }
689
690 static NTSTATUS enum_aliasmem(const struct dom_sid *alias, TALLOC_CTX *mem_ctx,
691 struct dom_sid **sids, size_t *num)
692 {
693 GROUP_MAP *map;
694 struct aliasmem_state state;
695
696 map = talloc_zero(talloc_tos(), GROUP_MAP);
697 if (!map) {
698 return NT_STATUS_NO_MEMORY;
699 }
700
701 if (!get_group_map_from_sid(*alias, map)) {
702 TALLOC_FREE(map);
703 return NT_STATUS_NO_SUCH_ALIAS;
704 }
705
706 if ((map->sid_name_use != SID_NAME_ALIAS) &&
707 (map->sid_name_use != SID_NAME_WKN_GRP)) {
708 TALLOC_FREE(map);
709 return NT_STATUS_NO_SUCH_ALIAS;
710 }
711
712 TALLOC_FREE(map);
713
714 *sids = NULL;
715 *num = 0;
716
717 state.alias = alias;
718 state.sids = sids;
719 state.num = num;
720 state.mem_ctx = mem_ctx;
721
722 dbwrap_traverse_read(db, collect_aliasmem, &state, NULL);
723 return NT_STATUS_OK;
724 }
725
726 static NTSTATUS del_aliasmem(const struct dom_sid *alias, const struct dom_sid *member)
727 {
728 NTSTATUS status;
729 struct dom_sid *sids;
730 size_t i, num;
731 bool found = False;
732 char *member_string;
733 char *key;
734 struct dom_sid_buf sid_string;
735
736 if (dbwrap_transaction_start(db) != 0) {
737 DEBUG(0, ("transaction_start failed\n"));
738 return NT_STATUS_INTERNAL_DB_CORRUPTION;
739 }
740
741 status = alias_memberships(member, 1, &sids, &num);
742
743 if (!NT_STATUS_IS_OK(status)) {
744 goto cancel;
745 }
746
747 for (i=0; i<num; i++) {
748 if (dom_sid_compare(&sids[i], alias) == 0) {
749 found = True;
750 break;
751 }
752 }
753
754 if (!found) {
755 TALLOC_FREE(sids);
756 status = NT_STATUS_MEMBER_NOT_IN_ALIAS;
757 goto cancel;
758 }
759
760 if (i < num)
761 sids[i] = sids[num-1];
762
763 num -= 1;
764
765 key = talloc_asprintf(
766 sids,
767 "%s%s",
768 MEMBEROF_PREFIX,
769 dom_sid_str_buf(member, &sid_string));
770 if (key == NULL) {
771 TALLOC_FREE(sids);
772 status = NT_STATUS_NO_MEMORY;
773 goto cancel;
774 }
775
776 if (num == 0) {
777 status = dbwrap_delete_bystring(db, key);
778 goto commit;
779 }
780
781 member_string = talloc_strdup(sids, "");
782 if (member_string == NULL) {
783 TALLOC_FREE(sids);
784 status = NT_STATUS_NO_MEMORY;
785 goto cancel;
786 }
787
788 for (i=0; i<num; i++) {
789
790 member_string = talloc_asprintf_append_buffer(
791 member_string,
792 " %s",
793 dom_sid_str_buf(&sids[i], &sid_string));
794
795 if (member_string == NULL) {
796 TALLOC_FREE(sids);
797 status = NT_STATUS_NO_MEMORY;
798 goto cancel;
799 }
800 }
801
802 status = dbwrap_store_bystring(
803 db, key, string_term_tdb_data(member_string), 0);
804 commit:
805 TALLOC_FREE(sids);
806
807 if (!NT_STATUS_IS_OK(status)) {
808 DEBUG(10, ("dbwrap_store_bystring failed: %s\n",
809 nt_errstr(status)));
810 goto cancel;
811 }
812
813 if (dbwrap_transaction_commit(db) != 0) {
814 DEBUG(0, ("transaction_commit failed\n"));
815 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
816 return status;
817 }
818
819 return NT_STATUS_OK;
820
821 cancel:
822 if (dbwrap_transaction_cancel(db) != 0) {
823 smb_panic("transaction_cancel failed");
824 }
825 return status;
826 }
827
828
829 /* -- ldb->tdb switching code -------------------------------------------- */
830
831 /* change this if the data format ever changes */
832 #define LTDB_PACKING_FORMAT 0x26011967
833
834 /* old packing formats (not supported for now,
835 * it was never used for group mapping AFAIK) */
836 #define LTDB_PACKING_FORMAT_NODN 0x26011966
837
838 static unsigned int pull_uint32(uint8_t *p, int ofs)
839 {
840 p += ofs;
841 return p[0] | (p[1]<<8) | (p[2]<<16) | (p[3]<<24);
842 }
843
844 /*
845 unpack a ldb message from a linear buffer in TDB_DATA
846 */
847 static int convert_ldb_record(TDB_CONTEXT *ltdb, TDB_DATA key,
848 TDB_DATA data, void *ptr)
849 {
850 TALLOC_CTX *tmp_ctx = talloc_tos();
851 GROUP_MAP *map = NULL;
852 uint8_t *p;
853 uint32_t format;
854 uint32_t num_el;
855 unsigned int remaining;
856 unsigned int i, j;
857 size_t len;
858 char *name;
859 char *val;
860 uint32_t num_mem = 0;
861 struct dom_sid *members = NULL;
862 int error = 0;
863
864 p = (uint8_t *)data.dptr;
865 if (data.dsize < 8) {
866 errno = EIO;
867 goto failed;
868 }
869
870 format = pull_uint32(p, 0);
871 num_el = pull_uint32(p, 4);
872 p += 8;
873
874 remaining = data.dsize - 8;
875
876 switch (format) {
877 case LTDB_PACKING_FORMAT:
878 len = strnlen((char *)p, remaining);
879 if (len == remaining) {
880 errno = EIO;
881 goto failed;
882 }
883
884 if (*p == '@') {
885 /* ignore special LDB attributes */
886 return 0;
887 }
888
889 if (strncmp((char *)p, "rid=", 4)) {
890 /* unknown entry, ignore */
891 DEBUG(3, ("Found unknown entry in group mapping "
892 "database named [%s]\n", (char *)p));
893 return 0;
894 }
895
896 remaining -= len + 1;
897 p += len + 1;
898 break;
899
900 case LTDB_PACKING_FORMAT_NODN:
901 default:
902 errno = EIO;
903 goto failed;
904 }
905
906 if (num_el == 0) {
907 /* bad entry, ignore */
908 return 0;
909 }
910
911 if (num_el > remaining / 6) {
912 errno = EIO;
913 goto failed;
914 }
915
916 map = talloc_zero(NULL, GROUP_MAP);
917 if (!map) {
918 errno = ENOMEM;
919 goto failed;
920 }
921
922 for (i = 0; i < num_el; i++) {
923 uint32_t num_vals;
924
925 if (remaining < 10) {
926 errno = EIO;
927 goto failed;
928 }
929 len = strnlen((char *)p, remaining - 6);
930 if (len == remaining - 6) {
931 errno = EIO;
932 goto failed;
933 }
934 name = talloc_strndup(tmp_ctx, (char *)p, len);
935 if (name == NULL) {
936 errno = ENOMEM;
937 goto failed;
938 }
939 remaining -= len + 1;
940 p += len + 1;
941
942 num_vals = pull_uint32(p, 0);
943 if (strcasecmp_m(name, "member") == 0) {
944 num_mem = num_vals;
945 members = talloc_array(tmp_ctx, struct dom_sid, num_mem);
946 if (members == NULL) {
947 errno = ENOMEM;
948 goto failed;
949 }
950 } else if (num_vals != 1) {
951 errno = EIO;
952 goto failed;
953 }
954
955 p += 4;
956 remaining -= 4;
957
958 for (j = 0; j < num_vals; j++) {
959 len = pull_uint32(p, 0);
960 if (len > remaining-5) {
961 errno = EIO;
962 goto failed;
963 }
964
965 val = talloc_strndup(tmp_ctx, (char *)(p + 4), len);
966 if (val == NULL) {
967 errno = ENOMEM;
968 goto failed;
969 }
970
971 remaining -= len+4+1;
972 p += len+4+1;
973
974 /* we ignore unknown or uninteresting attributes
975 * (objectclass, etc.) */
976 if (strcasecmp_m(name, "gidNumber") == 0) {
977 map->gid = smb_strtoul(val,
978 NULL,
979 10,
980 &error,
981 SMB_STR_FULL_STR_CONV);
982 if (error != 0) {
983 errno = EIO;
984 goto failed;
985 }
986 } else if (strcasecmp_m(name, "sid") == 0) {
987 if (!string_to_sid(&map->sid, val)) {
988 errno = EIO;
989 goto failed;
990 }
991 } else if (strcasecmp_m(name, "sidNameUse") == 0) {
992 map->sid_name_use =
993 smb_strtoul(val,
994 NULL,
995 10,
996 &error,
997 SMB_STR_FULL_STR_CONV);
998 if (error != 0) {
999 errno = EIO;
1000 goto failed;
1001 }
1002 } else if (strcasecmp_m(name, "ntname") == 0) {
1003 map->nt_name = talloc_strdup(map, val);
1004 if (!map->nt_name) {
1005 errno = ENOMEM;
1006 goto failed;
1007 }
1008 } else if (strcasecmp_m(name, "comment") == 0) {
1009 map->comment = talloc_strdup(map, val);
1010 if (!map->comment) {
1011 errno = ENOMEM;
1012 goto failed;
1013 }
1014 } else if (strcasecmp_m(name, "member") == 0) {
1015 if (!string_to_sid(&members[j], val)) {
1016 errno = EIO;
1017 goto failed;
1018 }
1019 }
1020
1021 TALLOC_FREE(val);
1022 }
1023
1024 TALLOC_FREE(name);
1025 }
1026
1027 if (map->nt_name == NULL) {
1028 errno = EIO;
1029 goto failed;
1030 }
1031
1032 if (map->comment == NULL) {
1033 map->comment = talloc_strdup(map, "");
1034 }
1035 if (map->comment == NULL) {
1036 errno = ENOMEM;
1037 goto failed;
1038 }
1039
1040 if (!add_mapping_entry(map, 0)) {
1041 errno = EIO;
1042 goto failed;
1043 }
1044
1045 if (num_mem) {
1046 for (j = 0; j < num_mem; j++) {
1047 NTSTATUS status;
1048 status = add_aliasmem(&map->sid, &members[j]);
1049 if (!NT_STATUS_IS_OK(status)) {
1050 errno = EIO;
1051 goto failed;
1052 }
1053 }
1054 }
1055
1056 if (remaining != 0) {
1057 DEBUG(0, ("Error: %d bytes unread in ltdb_unpack_data\n",
1058 remaining));
1059 }
1060
1061 TALLOC_FREE(map);
1062 return 0;
1063
1064 failed:
1065 TALLOC_FREE(map);
1066 return -1;
1067 }
1068
1069 static bool mapping_switch(const char *ldb_path)
1070 {
1071 TDB_CONTEXT *ltdb;
1072 TALLOC_CTX *frame;
1073 char *new_path;
1074 int ret;
1075
1076 frame = talloc_stackframe();
1077
1078 ltdb = tdb_open_log(ldb_path, 0, TDB_DEFAULT, O_RDONLY, 0600);
1079 if (ltdb == NULL) goto failed;
1080
1081 /* ldb is just a very fancy tdb, read out raw data and perform
1082 * conversion */
1083 ret = tdb_traverse(ltdb, convert_ldb_record, NULL);
1084 if (ret < 0) goto failed;
1085
1086 if (ltdb) {
1087 tdb_close(ltdb);
1088 ltdb = NULL;
1089 }
1090
1091 /* now rename the old db out of the way */
1092 new_path = state_path(talloc_tos(), "group_mapping.ldb.replaced");
1093 if (!new_path) {
1094 goto failed;
1095 }
1096 if (rename(ldb_path, new_path) != 0) {
1097 DEBUG(0,("Failed to rename old group mapping database\n"));
1098 goto failed;
1099 }
1100 TALLOC_FREE(frame);
1101 return True;
1102
1103 failed:
1104 DEBUG(0, ("Failed to switch to tdb group mapping database\n"));
1105 if (ltdb) tdb_close(ltdb);
1106 TALLOC_FREE(frame);
1107 return False;
1108 }
1109
1110 static const struct mapping_backend tdb_backend = {
1111 .add_mapping_entry = add_mapping_entry,
1112 .get_group_map_from_sid = get_group_map_from_sid,
1113 .get_group_map_from_gid = get_group_map_from_gid,
1114 .get_group_map_from_ntname = get_group_map_from_ntname,
1115 .group_map_remove = group_map_remove,
1116 .enum_group_mapping = enum_group_mapping,
1117 .one_alias_membership = one_alias_membership,
1118 .add_aliasmem = add_aliasmem,
1119 .del_aliasmem = del_aliasmem,
1120 .enum_aliasmem = enum_aliasmem
1121 };
1122
1123 /*
1124 initialise the tdb mapping backend
1125 */
1126 const struct mapping_backend *groupdb_tdb_init(void)
1127 {
1128 if (!init_group_mapping()) {
1129 DEBUG(0,("Failed to initialise tdb mapping backend\n"));
1130 return NULL;
1131 }
1132
1133 return &tdb_backend;
1134 }
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