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KCC: docstring for kcc.graph.InternalEdge
[Samba.git] / source3 / groupdb / mapping_tdb.c
blob8a6b28c2a1c68f6762a62cb72f1a4434381df7bf
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("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("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 char sidstr[DOM_SID_STR_BUFLEN];
137 int len;
138
139 len = dom_sid_string_buf(sid, sidstr, sizeof(sidstr));
140 if (len >= sizeof(sidstr)) {
141 return NULL;
142 }
143
144 return talloc_asprintf(mem_ctx, "%s%s", GROUP_PREFIX, sidstr);
145 }
146
147 /****************************************************************************
148 ****************************************************************************/
149 static bool add_mapping_entry(GROUP_MAP *map, int flag)
150 {
151 char *key, *buf;
152 int len;
153 NTSTATUS status;
154
155 key = group_mapping_key(talloc_tos(), &map->sid);
156 if (key == NULL) {
157 return false;
158 }
159
160 len = tdb_pack(NULL, 0, "ddff",
161 map->gid, map->sid_name_use, map->nt_name, map->comment);
162
163 buf = talloc_array(key, char, len);
164 if (!buf) {
165 TALLOC_FREE(key);
166 return false;
167 }
168 len = tdb_pack((uint8_t *)buf, len, "ddff", map->gid,
169 map->sid_name_use, map->nt_name, map->comment);
170
171 status = dbwrap_trans_store(
172 db, string_term_tdb_data(key),
173 make_tdb_data((uint8_t *)buf, len), TDB_REPLACE);
174
175 TALLOC_FREE(key);
176
177 return NT_STATUS_IS_OK(status);
178 }
179
180
181 /****************************************************************************
182 Return the sid and the type of the unix group.
183 ****************************************************************************/
184
185 static bool get_group_map_from_sid(struct dom_sid sid, GROUP_MAP *map)
186 {
187 TDB_DATA dbuf;
188 char *key;
189 int ret = 0;
190 NTSTATUS status;
191 fstring nt_name;
192 fstring comment;
193
194 /* the key is the SID, retrieving is direct */
195
196 key = group_mapping_key(talloc_tos(), &sid);
197 if (key == NULL) {
198 return false;
199 }
200
201 status = dbwrap_fetch_bystring(db, key, key, &dbuf);
202 if (!NT_STATUS_IS_OK(status)) {
203 TALLOC_FREE(key);
204 return false;
205 }
206
207 ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
208 &map->gid, &map->sid_name_use,
209 &nt_name, &comment);
210
211 TALLOC_FREE(key);
212
213 if ( ret == -1 ) {
214 DEBUG(3,("get_group_map_from_sid: tdb_unpack failure\n"));
215 return false;
216 }
217
218 sid_copy(&map->sid, &sid);
219
220 map->nt_name = talloc_strdup(map, nt_name);
221 if (!map->nt_name) {
222 return false;
223 }
224 map->comment = talloc_strdup(map, comment);
225 if (!map->comment) {
226 return false;
227 }
228
229 return true;
230 }
231
232 static bool dbrec2map(const struct db_record *rec, GROUP_MAP *map)
233 {
234 TDB_DATA key = dbwrap_record_get_key(rec);
235 TDB_DATA value = dbwrap_record_get_value(rec);
236 int ret = 0;
237 fstring nt_name;
238 fstring comment;
239
240 if ((key.dsize < strlen(GROUP_PREFIX))
241 || (strncmp((char *)key.dptr, GROUP_PREFIX,
242 GROUP_PREFIX_LEN) != 0)) {
243 return False;
244 }
245
246 if (!string_to_sid(&map->sid, (const char *)key.dptr
247 + GROUP_PREFIX_LEN)) {
248 return False;
249 }
250
251 ret = tdb_unpack(value.dptr, value.dsize, "ddff",
252 &map->gid, &map->sid_name_use,
253 &nt_name, &comment);
254
255 if (ret == -1) {
256 DEBUG(3, ("dbrec2map: tdb_unpack failure\n"));
257 return false;
258 }
259
260 map->nt_name = talloc_strdup(map, nt_name);
261 if (!map->nt_name) {
262 return false;
263 }
264 map->comment = talloc_strdup(map, comment);
265 if (!map->comment) {
266 return false;
267 }
268
269 return true;
270 }
271
272 struct find_map_state {
273 bool found;
274 const char *name; /* If != NULL, look for name */
275 gid_t gid; /* valid iff name == NULL */
276 GROUP_MAP *map;
277 };
278
279 static int find_map(struct db_record *rec, void *private_data)
280 {
281 struct find_map_state *state = (struct find_map_state *)private_data;
282
283 if (!dbrec2map(rec, state->map)) {
284 DEBUG(10, ("failed to unpack map\n"));
285 return 0;
286 }
287
288 if (state->name != NULL) {
289 if (strequal(state->name, state->map->nt_name)) {
290 state->found = true;
291 return 1;
292 }
293 }
294 else {
295 if (state->map->gid == state->gid) {
296 state->found = true;
297 return 1;
298 }
299 }
300
301 return 0;
302 }
303
304 /****************************************************************************
305 Return the sid and the type of the unix group.
306 ****************************************************************************/
307
308 static bool get_group_map_from_gid(gid_t gid, GROUP_MAP *map)
309 {
310 struct find_map_state state;
311
312 state.found = false;
313 state.name = NULL; /* Indicate we're looking for gid */
314 state.gid = gid;
315 state.map = map;
316
317 dbwrap_traverse_read(db, find_map, (void *)&state, NULL);
318
319 return state.found;
320 }
321
322 /****************************************************************************
323 Return the sid and the type of the unix group.
324 ****************************************************************************/
325
326 static bool get_group_map_from_ntname(const char *name, GROUP_MAP *map)
327 {
328 struct find_map_state state;
329
330 state.found = false;
331 state.name = name;
332 state.map = map;
333
334 dbwrap_traverse_read(db, find_map, (void *)&state, NULL);
335
336 return state.found;
337 }
338
339 /****************************************************************************
340 Remove a group mapping entry.
341 ****************************************************************************/
342
343 static bool group_map_remove(const struct dom_sid *sid)
344 {
345 char *key;
346 NTSTATUS status;
347
348 key = group_mapping_key(talloc_tos(), sid);
349 if (key == NULL) {
350 return false;
351 }
352
353 status = dbwrap_trans_delete(db, string_term_tdb_data(key));
354
355 TALLOC_FREE(key);
356 return NT_STATUS_IS_OK(status);
357 }
358
359 /****************************************************************************
360 Enumerate the group mapping.
361 ****************************************************************************/
362
363 struct enum_map_state {
364 const struct dom_sid *domsid;
365 enum lsa_SidType sid_name_use;
366 bool unix_only;
367
368 size_t num_maps;
369 GROUP_MAP **maps;
370 };
371
372 static int collect_map(struct db_record *rec, void *private_data)
373 {
374 struct enum_map_state *state = (struct enum_map_state *)private_data;
375 GROUP_MAP *map;
376 GROUP_MAP **tmp;
377
378 map = talloc_zero(NULL, GROUP_MAP);
379 if (!map) {
380 DEBUG(0, ("Unable to allocate group map!\n"));
381 return 1;
382 }
383
384 if (!dbrec2map(rec, map)) {
385 TALLOC_FREE(map);
386 return 0;
387 }
388 /* list only the type or everything if UNKNOWN */
389 if (state->sid_name_use != SID_NAME_UNKNOWN
390 && state->sid_name_use != map->sid_name_use) {
391 DEBUG(11,("enum_group_mapping: group %s is not of the "
392 "requested type\n", map->nt_name));
393 TALLOC_FREE(map);
394 return 0;
395 }
396
397 if ((state->unix_only == ENUM_ONLY_MAPPED) && (map->gid == -1)) {
398 DEBUG(11,("enum_group_mapping: group %s is non mapped\n",
399 map->nt_name));
400 TALLOC_FREE(map);
401 return 0;
402 }
403
404 if ((state->domsid != NULL) &&
405 (dom_sid_compare_domain(state->domsid, &map->sid) != 0)) {
406 DEBUG(11,("enum_group_mapping: group %s is not in domain\n",
407 sid_string_dbg(&map->sid)));
408 TALLOC_FREE(map);
409 return 0;
410 }
411
412 tmp = talloc_realloc(NULL, state->maps, GROUP_MAP *,
413 state->num_maps + 1);
414 if (!tmp) {
415 DEBUG(0,("enum_group_mapping: Unable to enlarge group "
416 "map!\n"));
417 TALLOC_FREE(map);
418 return 1;
419 }
420
421 state->maps = tmp;
422 state->maps[state->num_maps] = talloc_move(state->maps, &map);
423 state->num_maps++;
424 return 0;
425 }
426
427 static bool enum_group_mapping(const struct dom_sid *domsid,
428 enum lsa_SidType sid_name_use,
429 GROUP_MAP ***pp_rmap,
430 size_t *p_num_entries, bool unix_only)
431 {
432 struct enum_map_state state;
433 NTSTATUS status;
434
435 state.domsid = domsid;
436 state.sid_name_use = sid_name_use;
437 state.unix_only = unix_only;
438 state.num_maps = 0;
439 state.maps = NULL;
440
441 status = dbwrap_traverse_read(db, collect_map, (void *)&state, NULL);
442 if (!NT_STATUS_IS_OK(status)) {
443 TALLOC_FREE(state.maps);
444 return false;
445 }
446
447 *pp_rmap = state.maps;
448 *p_num_entries = state.num_maps;
449
450 return true;
451 }
452
453 /* This operation happens on session setup, so it should better be fast. We
454 * store a list of aliases a SID is member of hanging off MEMBEROF/SID. */
455
456 static NTSTATUS one_alias_membership(const struct dom_sid *member,
457 struct dom_sid **sids, size_t *num)
458 {
459 fstring tmp;
460 fstring key;
461 char *string_sid;
462 TDB_DATA dbuf;
463 const char *p;
464 NTSTATUS status = NT_STATUS_OK;
465 TALLOC_CTX *frame = talloc_stackframe();
466
467 slprintf(key, sizeof(key), "%s%s", MEMBEROF_PREFIX,
468 sid_to_fstring(tmp, member));
469
470 status = dbwrap_fetch_bystring(db, frame, key, &dbuf);
471 if (!NT_STATUS_IS_OK(status)) {
472 TALLOC_FREE(frame);
473 return NT_STATUS_OK;
474 }
475
476 p = (const char *)dbuf.dptr;
477
478 while (next_token_talloc(frame, &p, &string_sid, " ")) {
479 struct dom_sid alias;
480 uint32_t num_sids;
481
482 if (!string_to_sid(&alias, string_sid))
483 continue;
484
485 num_sids = *num;
486 status= add_sid_to_array_unique(NULL, &alias, sids, &num_sids);
487 if (!NT_STATUS_IS_OK(status)) {
488 goto done;
489 }
490 *num = num_sids;
491 }
492
493 done:
494 TALLOC_FREE(frame);
495 return status;
496 }
497
498 static NTSTATUS alias_memberships(const struct dom_sid *members, size_t num_members,
499 struct dom_sid **sids, size_t *num)
500 {
501 size_t i;
502
503 *num = 0;
504 *sids = NULL;
505
506 for (i=0; i<num_members; i++) {
507 NTSTATUS status = one_alias_membership(&members[i], sids, num);
508 if (!NT_STATUS_IS_OK(status))
509 return status;
510 }
511 return NT_STATUS_OK;
512 }
513
514 static bool is_aliasmem(const struct dom_sid *alias, const struct dom_sid *member)
515 {
516 struct dom_sid *sids;
517 size_t i;
518 size_t num;
519
520 /* This feels the wrong way round, but the on-disk data structure
521 * dictates it this way. */
522 if (!NT_STATUS_IS_OK(alias_memberships(member, 1, &sids, &num)))
523 return False;
524
525 for (i=0; i<num; i++) {
526 if (dom_sid_compare(alias, &sids[i]) == 0) {
527 TALLOC_FREE(sids);
528 return True;
529 }
530 }
531 TALLOC_FREE(sids);
532 return False;
533 }
534
535
536 static NTSTATUS add_aliasmem(const struct dom_sid *alias, const struct dom_sid *member)
537 {
538 GROUP_MAP *map;
539 char *key;
540 fstring string_sid;
541 char *new_memberstring;
542 struct db_record *rec;
543 NTSTATUS status;
544 TDB_DATA value;
545
546 map = talloc_zero(talloc_tos(), GROUP_MAP);
547 if (!map) {
548 return NT_STATUS_NO_MEMORY;
549 }
550
551 if (!get_group_map_from_sid(*alias, map)) {
552 TALLOC_FREE(map);
553 return NT_STATUS_NO_SUCH_ALIAS;
554 }
555
556 if ((map->sid_name_use != SID_NAME_ALIAS) &&
557 (map->sid_name_use != SID_NAME_WKN_GRP)) {
558 TALLOC_FREE(map);
559 return NT_STATUS_NO_SUCH_ALIAS;
560 }
561
562 TALLOC_FREE(map);
563
564 if (is_aliasmem(alias, member))
565 return NT_STATUS_MEMBER_IN_ALIAS;
566
567 sid_to_fstring(string_sid, member);
568
569 key = talloc_asprintf(talloc_tos(), "%s%s", MEMBEROF_PREFIX,
570 string_sid);
571 if (key == NULL) {
572 return NT_STATUS_NO_MEMORY;
573 }
574
575 if (dbwrap_transaction_start(db) != 0) {
576 DEBUG(0, ("transaction_start failed\n"));
577 return NT_STATUS_INTERNAL_DB_CORRUPTION;
578 }
579
580 rec = dbwrap_fetch_locked(db, key, string_term_tdb_data(key));
581
582 if (rec == NULL) {
583 DEBUG(10, ("fetch_lock failed\n"));
584 TALLOC_FREE(key);
585 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
586 goto cancel;
587 }
588
589 value = dbwrap_record_get_value(rec);
590
591 sid_to_fstring(string_sid, alias);
592
593 if (value.dptr != NULL) {
594 new_memberstring = talloc_asprintf(
595 key, "%s %s", (char *)(value.dptr), string_sid);
596 } else {
597 new_memberstring = talloc_strdup(key, string_sid);
598 }
599
600 if (new_memberstring == NULL) {
601 TALLOC_FREE(key);
602 status = NT_STATUS_NO_MEMORY;
603 goto cancel;
604 }
605
606 status = dbwrap_record_store(rec, string_term_tdb_data(new_memberstring), 0);
607
608 TALLOC_FREE(key);
609
610 if (!NT_STATUS_IS_OK(status)) {
611 DEBUG(10, ("Could not store record: %s\n", nt_errstr(status)));
612 goto cancel;
613 }
614
615 if (dbwrap_transaction_commit(db) != 0) {
616 DEBUG(0, ("transaction_commit failed\n"));
617 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
618 return status;
619 }
620
621 return NT_STATUS_OK;
622
623 cancel:
624 if (dbwrap_transaction_cancel(db) != 0) {
625 smb_panic("transaction_cancel failed");
626 }
627
628 return status;
629 }
630
631 struct aliasmem_state {
632 TALLOC_CTX *mem_ctx;
633 const struct dom_sid *alias;
634 struct dom_sid **sids;
635 size_t *num;
636 };
637
638 static int collect_aliasmem(struct db_record *rec, void *priv)
639 {
640 struct aliasmem_state *state = (struct aliasmem_state *)priv;
641 const char *p;
642 char *alias_string;
643 TALLOC_CTX *frame;
644 TDB_DATA key = dbwrap_record_get_key(rec);
645 TDB_DATA value = dbwrap_record_get_value(rec);
646
647 if (strncmp((const char *)key.dptr, MEMBEROF_PREFIX,
648 MEMBEROF_PREFIX_LEN) != 0)
649 return 0;
650
651 p = (const char *)value.dptr;
652
653 frame = talloc_stackframe();
654
655 while (next_token_talloc(frame, &p, &alias_string, " ")) {
656 struct dom_sid alias, member;
657 const char *member_string;
658 uint32_t num_sids;
659
660 if (!string_to_sid(&alias, alias_string))
661 continue;
662
663 if (dom_sid_compare(state->alias, &alias) != 0)
664 continue;
665
666 /* Ok, we found the alias we're looking for in the membership
667 * list currently scanned. The key represents the alias
668 * member. Add that. */
669
670 member_string = strchr((const char *)key.dptr, '/');
671
672 /* Above we tested for MEMBEROF_PREFIX which includes the
673 * slash. */
674
675 SMB_ASSERT(member_string != NULL);
676 member_string += 1;
677
678 if (!string_to_sid(&member, member_string))
679 continue;
680
681 num_sids = *state->num;
682 if (!NT_STATUS_IS_OK(add_sid_to_array(state->mem_ctx, &member,
683 state->sids,
684 &num_sids)))
685 {
686 /* talloc fail. */
687 break;
688 }
689 *state->num = num_sids;
690 }
691
692 TALLOC_FREE(frame);
693 return 0;
694 }
695
696 static NTSTATUS enum_aliasmem(const struct dom_sid *alias, TALLOC_CTX *mem_ctx,
697 struct dom_sid **sids, size_t *num)
698 {
699 GROUP_MAP *map;
700 struct aliasmem_state state;
701
702 map = talloc_zero(talloc_tos(), GROUP_MAP);
703 if (!map) {
704 return NT_STATUS_NO_MEMORY;
705 }
706
707 if (!get_group_map_from_sid(*alias, map)) {
708 TALLOC_FREE(map);
709 return NT_STATUS_NO_SUCH_ALIAS;
710 }
711
712 if ((map->sid_name_use != SID_NAME_ALIAS) &&
713 (map->sid_name_use != SID_NAME_WKN_GRP)) {
714 TALLOC_FREE(map);
715 return NT_STATUS_NO_SUCH_ALIAS;
716 }
717
718 TALLOC_FREE(map);
719
720 *sids = NULL;
721 *num = 0;
722
723 state.alias = alias;
724 state.sids = sids;
725 state.num = num;
726 state.mem_ctx = mem_ctx;
727
728 dbwrap_traverse_read(db, collect_aliasmem, &state, NULL);
729 return NT_STATUS_OK;
730 }
731
732 static NTSTATUS del_aliasmem(const struct dom_sid *alias, const struct dom_sid *member)
733 {
734 NTSTATUS status;
735 struct dom_sid *sids;
736 size_t i, num;
737 bool found = False;
738 char *member_string;
739 char *key;
740 fstring sid_string;
741
742 if (dbwrap_transaction_start(db) != 0) {
743 DEBUG(0, ("transaction_start failed\n"));
744 return NT_STATUS_INTERNAL_DB_CORRUPTION;
745 }
746
747 status = alias_memberships(member, 1, &sids, &num);
748
749 if (!NT_STATUS_IS_OK(status)) {
750 goto cancel;
751 }
752
753 for (i=0; i<num; i++) {
754 if (dom_sid_compare(&sids[i], alias) == 0) {
755 found = True;
756 break;
757 }
758 }
759
760 if (!found) {
761 TALLOC_FREE(sids);
762 status = NT_STATUS_MEMBER_NOT_IN_ALIAS;
763 goto cancel;
764 }
765
766 if (i < num)
767 sids[i] = sids[num-1];
768
769 num -= 1;
770
771 sid_to_fstring(sid_string, member);
772
773 key = talloc_asprintf(sids, "%s%s", MEMBEROF_PREFIX, sid_string);
774 if (key == NULL) {
775 TALLOC_FREE(sids);
776 status = NT_STATUS_NO_MEMORY;
777 goto cancel;
778 }
779
780 if (num == 0) {
781 status = dbwrap_delete_bystring(db, key);
782 goto commit;
783 }
784
785 member_string = talloc_strdup(sids, "");
786 if (member_string == NULL) {
787 TALLOC_FREE(sids);
788 status = NT_STATUS_NO_MEMORY;
789 goto cancel;
790 }
791
792 for (i=0; i<num; i++) {
793
794 sid_to_fstring(sid_string, &sids[i]);
795
796 member_string = talloc_asprintf_append_buffer(
797 member_string, " %s", sid_string);
798
799 if (member_string == NULL) {
800 TALLOC_FREE(sids);
801 status = NT_STATUS_NO_MEMORY;
802 goto cancel;
803 }
804 }
805
806 status = dbwrap_store_bystring(
807 db, key, string_term_tdb_data(member_string), 0);
808 commit:
809 TALLOC_FREE(sids);
810
811 if (!NT_STATUS_IS_OK(status)) {
812 DEBUG(10, ("dbwrap_store_bystring failed: %s\n",
813 nt_errstr(status)));
814 goto cancel;
815 }
816
817 if (dbwrap_transaction_commit(db) != 0) {
818 DEBUG(0, ("transaction_commit failed\n"));
819 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
820 return status;
821 }
822
823 return NT_STATUS_OK;
824
825 cancel:
826 if (dbwrap_transaction_cancel(db) != 0) {
827 smb_panic("transaction_cancel failed");
828 }
829 return status;
830 }
831
832
833 /* -- ldb->tdb switching code -------------------------------------------- */
834
835 /* change this if the data format ever changes */
836 #define LTDB_PACKING_FORMAT 0x26011967
837
838 /* old packing formats (not supported for now,
839 * it was never used for group mapping AFAIK) */
840 #define LTDB_PACKING_FORMAT_NODN 0x26011966
841
842 static unsigned int pull_uint32(uint8_t *p, int ofs)
843 {
844 p += ofs;
845 return p[0] | (p[1]<<8) | (p[2]<<16) | (p[3]<<24);
846 }
847
848 /*
849 unpack a ldb message from a linear buffer in TDB_DATA
850 */
851 static int convert_ldb_record(TDB_CONTEXT *ltdb, TDB_DATA key,
852 TDB_DATA data, void *ptr)
853 {
854 TALLOC_CTX *tmp_ctx = talloc_tos();
855 GROUP_MAP *map = NULL;
856 uint8_t *p;
857 uint32_t format;
858 uint32_t num_el;
859 unsigned int remaining;
860 unsigned int i, j;
861 size_t len;
862 char *name;
863 char *val;
864 char *q;
865 uint32_t num_mem = 0;
866 struct dom_sid *members = NULL;
867
868 p = (uint8_t *)data.dptr;
869 if (data.dsize < 8) {
870 errno = EIO;
871 goto failed;
872 }
873
874 format = pull_uint32(p, 0);
875 num_el = pull_uint32(p, 4);
876 p += 8;
877
878 remaining = data.dsize - 8;
879
880 switch (format) {
881 case LTDB_PACKING_FORMAT:
882 len = strnlen((char *)p, remaining);
883 if (len == remaining) {
884 errno = EIO;
885 goto failed;
886 }
887
888 if (*p == '@') {
889 /* ignore special LDB attributes */
890 return 0;
891 }
892
893 if (strncmp((char *)p, "rid=", 4)) {
894 /* unknown entry, ignore */
895 DEBUG(3, ("Found unknown entry in group mapping "
896 "database named [%s]\n", (char *)p));
897 return 0;
898 }
899
900 remaining -= len + 1;
901 p += len + 1;
902 break;
903
904 case LTDB_PACKING_FORMAT_NODN:
905 default:
906 errno = EIO;
907 goto failed;
908 }
909
910 if (num_el == 0) {
911 /* bad entry, ignore */
912 return 0;
913 }
914
915 if (num_el > remaining / 6) {
916 errno = EIO;
917 goto failed;
918 }
919
920 map = talloc_zero(NULL, GROUP_MAP);
921 if (!map) {
922 errno = ENOMEM;
923 goto failed;
924 }
925
926 for (i = 0; i < num_el; i++) {
927 uint32_t num_vals;
928
929 if (remaining < 10) {
930 errno = EIO;
931 goto failed;
932 }
933 len = strnlen((char *)p, remaining - 6);
934 if (len == remaining - 6) {
935 errno = EIO;
936 goto failed;
937 }
938 name = talloc_strndup(tmp_ctx, (char *)p, len);
939 if (name == NULL) {
940 errno = ENOMEM;
941 goto failed;
942 }
943 remaining -= len + 1;
944 p += len + 1;
945
946 num_vals = pull_uint32(p, 0);
947 if (strcasecmp_m(name, "member") == 0) {
948 num_mem = num_vals;
949 members = talloc_array(tmp_ctx, struct dom_sid, num_mem);
950 if (members == NULL) {
951 errno = ENOMEM;
952 goto failed;
953 }
954 } else if (num_vals != 1) {
955 errno = EIO;
956 goto failed;
957 }
958
959 p += 4;
960 remaining -= 4;
961
962 for (j = 0; j < num_vals; j++) {
963 len = pull_uint32(p, 0);
964 if (len > remaining-5) {
965 errno = EIO;
966 goto failed;
967 }
968
969 val = talloc_strndup(tmp_ctx, (char *)(p + 4), len);
970 if (val == NULL) {
971 errno = ENOMEM;
972 goto failed;
973 }
974
975 remaining -= len+4+1;
976 p += len+4+1;
977
978 /* we ignore unknown or uninteresting attributes
979 * (objectclass, etc.) */
980 if (strcasecmp_m(name, "gidNumber") == 0) {
981 map->gid = strtoul(val, &q, 10);
982 if (*q) {
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 = strtoul(val, &q, 10);
993 if (*q) {
994 errno = EIO;
995 goto failed;
996 }
997 } else if (strcasecmp_m(name, "ntname") == 0) {
998 map->nt_name = talloc_strdup(map, val);
999 if (!map->nt_name) {
1000 errno = ENOMEM;
1001 goto failed;
1002 }
1003 } else if (strcasecmp_m(name, "comment") == 0) {
1004 map->comment = talloc_strdup(map, val);
1005 if (!map->comment) {
1006 errno = ENOMEM;
1007 goto failed;
1008 }
1009 } else if (strcasecmp_m(name, "member") == 0) {
1010 if (!string_to_sid(&members[j], val)) {
1011 errno = EIO;
1012 goto failed;
1013 }
1014 }
1015
1016 TALLOC_FREE(val);
1017 }
1018
1019 TALLOC_FREE(name);
1020 }
1021
1022 if (map->nt_name == NULL) {
1023 errno = EIO;
1024 goto failed;
1025 }
1026
1027 if (map->comment == NULL) {
1028 map->comment = talloc_strdup(map, "");
1029 }
1030 if (map->comment == NULL) {
1031 errno = ENOMEM;
1032 goto failed;
1033 }
1034
1035 if (!add_mapping_entry(map, 0)) {
1036 errno = EIO;
1037 goto failed;
1038 }
1039
1040 if (num_mem) {
1041 for (j = 0; j < num_mem; j++) {
1042 NTSTATUS status;
1043 status = add_aliasmem(&map->sid, &members[j]);
1044 if (!NT_STATUS_IS_OK(status)) {
1045 errno = EIO;
1046 goto failed;
1047 }
1048 }
1049 }
1050
1051 if (remaining != 0) {
1052 DEBUG(0, ("Errror: %d bytes unread in ltdb_unpack_data\n",
1053 remaining));
1054 }
1055
1056 TALLOC_FREE(map);
1057 return 0;
1058
1059 failed:
1060 TALLOC_FREE(map);
1061 return -1;
1062 }
1063
1064 static bool mapping_switch(const char *ldb_path)
1065 {
1066 TDB_CONTEXT *ltdb;
1067 TALLOC_CTX *frame;
1068 char *new_path;
1069 int ret;
1070
1071 frame = talloc_stackframe();
1072
1073 ltdb = tdb_open_log(ldb_path, 0, TDB_DEFAULT, O_RDONLY, 0600);
1074 if (ltdb == NULL) goto failed;
1075
1076 /* ldb is just a very fancy tdb, read out raw data and perform
1077 * conversion */
1078 ret = tdb_traverse(ltdb, convert_ldb_record, NULL);
1079 if (ret < 0) goto failed;
1080
1081 if (ltdb) {
1082 tdb_close(ltdb);
1083 ltdb = NULL;
1084 }
1085
1086 /* now rename the old db out of the way */
1087 new_path = state_path("group_mapping.ldb.replaced");
1088 if (!new_path) {
1089 goto failed;
1090 }
1091 if (rename(ldb_path, new_path) != 0) {
1092 DEBUG(0,("Failed to rename old group mapping database\n"));
1093 goto failed;
1094 }
1095 TALLOC_FREE(frame);
1096 return True;
1097
1098 failed:
1099 DEBUG(0, ("Failed to switch to tdb group mapping database\n"));
1100 if (ltdb) tdb_close(ltdb);
1101 TALLOC_FREE(frame);
1102 return False;
1103 }
1104
1105 static const struct mapping_backend tdb_backend = {
1106 .add_mapping_entry = add_mapping_entry,
1107 .get_group_map_from_sid = get_group_map_from_sid,
1108 .get_group_map_from_gid = get_group_map_from_gid,
1109 .get_group_map_from_ntname = get_group_map_from_ntname,
1110 .group_map_remove = group_map_remove,
1111 .enum_group_mapping = enum_group_mapping,
1112 .one_alias_membership = one_alias_membership,
1113 .add_aliasmem = add_aliasmem,
1114 .del_aliasmem = del_aliasmem,
1115 .enum_aliasmem = enum_aliasmem
1116 };
1117
1118 /*
1119 initialise the tdb mapping backend
1120 */
1121 const struct mapping_backend *groupdb_tdb_init(void)
1122 {
1123 if (!init_group_mapping()) {
1124 DEBUG(0,("Failed to initialise tdb mapping backend\n"));
1125 return NULL;
1126 }
1127
1128 return &tdb_backend;
1129 }
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