source: vendor/3.5.4/source3/groupdb/mapping_tdb.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 17.1 KB
Line 
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
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}
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