source: vendor/3.5.0/source3/groupdb/mapping_ldb.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 15.9 KB
Line 
1/*
2 * Unix SMB/CIFS implementation.
3 *
4 * group mapping code on top of ldb
5 *
6 * Copyright (C) Andrew Tridgell 2006
7 *
8 * based on tdb group mapping code from groupdb/mapping.c
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 3 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, see <http://www.gnu.org/licenses/>.
22 */
23
24#include "includes.h"
25#include "groupdb/mapping.h"
26#include "lib/ldb/include/ldb.h"
27#include "lib/ldb/include/ldb_errors.h"
28
29static struct ldb_context *ldb;
30
31static bool mapping_upgrade(const char *tdb_path);
32
33/*
34 connect to the group mapping ldb
35*/
36static bool init_group_mapping(void)
37{
38 bool existed;
39 const char *init_ldif[] =
40 { "dn: @ATTRIBUTES\n" \
41 "ntName: CASE_INSENSITIVE\n" \
42 "\n",
43 "dn: @INDEXLIST\n" \
44 "@IDXATTR: gidNumber\n" \
45 "@IDXATTR: ntName\n" \
46 "@IDXATTR: member\n" };
47 const char *db_path, *tdb_path;
48 int ret;
49 int flags = 0;
50
51 if (ldb != NULL) {
52 return True;
53 }
54
55 /* this is needed as Samba3 doesn't have this globally yet */
56 ldb_global_init();
57
58 db_path = state_path("group_mapping.ldb");
59
60 ldb = ldb_init(NULL, NULL);
61 if (ldb == NULL) goto failed;
62
63 /* Ensure this db is created read/write for root only. */
64 ldb_set_create_perms(ldb, 0600);
65
66 existed = file_exist(db_path);
67
68 if (lp_parm_bool(-1, "groupmap", "nosync", False)) {
69 flags |= LDB_FLG_NOSYNC;
70 }
71
72 if (!lp_use_mmap()) {
73 flags |= LDB_FLG_NOMMAP;
74 }
75
76 ret = ldb_connect(ldb, db_path, flags, NULL);
77 if (ret != LDB_SUCCESS) {
78 goto failed;
79 }
80
81 /* force the permissions on the ldb to 0600 - this will fix
82 existing databases as well as new ones */
83 if (chmod(db_path, 0600) != 0) {
84 goto failed;
85 }
86
87 if (!existed) {
88 /* initialise the ldb with an index */
89 struct ldb_ldif *ldif;
90 int i;
91 for (i=0;i<ARRAY_SIZE(init_ldif);i++) {
92 ldif = ldb_ldif_read_string(ldb, &init_ldif[i]);
93 if (ldif == NULL) goto failed;
94 ret = ldb_add(ldb, ldif->msg);
95 talloc_free(ldif);
96 if (ret == -1) goto failed;
97 }
98 }
99
100 /* possibly upgrade */
101 tdb_path = state_path("group_mapping.tdb");
102 if (file_exist(tdb_path) && !mapping_upgrade(tdb_path)) {
103 unlink(state_path("group_mapping.ldb"));
104 goto failed;
105 }
106
107 return True;
108
109failed:
110 DEBUG(0,("Failed to open group mapping ldb '%s' - '%s'\n",
111 db_path, ldb?ldb_errstring(ldb):strerror(errno)));
112 talloc_free(ldb);
113 ldb = NULL;
114 return False;
115}
116
117
118/*
119 form the DN for a mapping entry from a SID
120 */
121static struct ldb_dn *mapping_dn(TALLOC_CTX *mem_ctx, const DOM_SID *sid)
122{
123 fstring string_sid;
124 uint32_t rid;
125 DOM_SID domsid;
126
127 sid_copy(&domsid, sid);
128 if (!sid_split_rid(&domsid, &rid)) {
129 return NULL;
130 }
131 if (!sid_to_fstring(string_sid, &domsid)) {
132 return NULL;
133 }
134 /* we split by domain and rid so we can do a subtree search
135 when we only want one domain */
136 return ldb_dn_new_fmt(mem_ctx, ldb, "rid=%u,domain=%s",
137 rid, string_sid);
138}
139
140/*
141 add a group mapping entry
142 */
143static bool add_mapping_entry(GROUP_MAP *map, int flag)
144{
145 struct ldb_message *msg;
146 int ret, i;
147 fstring string_sid;
148
149 msg = ldb_msg_new(ldb);
150 if (msg == NULL) {
151 return False;
152 }
153
154 msg->dn = mapping_dn(msg, &map->sid);
155 if (msg->dn == NULL) {
156 goto failed;
157 }
158
159 if (ldb_msg_add_string(msg, "objectClass", "groupMap") != LDB_SUCCESS ||
160 ldb_msg_add_string(msg, "sid",
161 sid_to_fstring(string_sid, &map->sid)) != LDB_SUCCESS ||
162 ldb_msg_add_fmt(msg, "gidNumber", "%u", (unsigned)map->gid) != LDB_SUCCESS ||
163 ldb_msg_add_fmt(msg, "sidNameUse", "%u", (unsigned)map->sid_name_use) != LDB_SUCCESS ||
164 ldb_msg_add_string(msg, "comment", map->comment) != LDB_SUCCESS ||
165 ldb_msg_add_string(msg, "ntName", map->nt_name) != LDB_SUCCESS) {
166 goto failed;
167 }
168
169 ret = ldb_add(ldb, msg);
170
171 /* if it exists we update it. This is a hangover from the semantics the
172 tdb backend had */
173 if (ret == LDB_ERR_ENTRY_ALREADY_EXISTS) {
174 for (i=0;i<msg->num_elements;i++) {
175 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
176 }
177 ret = ldb_modify(ldb, msg);
178 }
179
180 talloc_free(msg);
181
182 return ret == LDB_SUCCESS;
183
184failed:
185 talloc_free(msg);
186 return False;
187}
188
189/*
190 unpack a ldb message into a GROUP_MAP structure
191*/
192static bool msg_to_group_map(struct ldb_message *msg, GROUP_MAP *map)
193{
194 const char *sidstr;
195
196 map->gid = ldb_msg_find_attr_as_int(msg, "gidNumber", -1);
197 map->sid_name_use = ldb_msg_find_attr_as_int(msg, "sidNameUse", -1);
198 fstrcpy(map->nt_name, ldb_msg_find_attr_as_string(msg, "ntName", NULL));
199 fstrcpy(map->comment, ldb_msg_find_attr_as_string(msg, "comment", NULL));
200 sidstr = ldb_msg_find_attr_as_string(msg, "sid", NULL);
201
202 if (!string_to_sid(&map->sid, sidstr) ||
203 map->gid == (gid_t)-1 ||
204 map->sid_name_use == (enum lsa_SidType)-1) {
205 DEBUG(0,("Unable to unpack group mapping\n"));
206 return False;
207 }
208
209 return True;
210}
211
212/*
213 return a group map entry for a given sid
214*/
215static bool get_group_map_from_sid(DOM_SID sid, GROUP_MAP *map)
216{
217 int ret;
218 struct ldb_dn *dn;
219 struct ldb_result *res=NULL;
220 bool result = false;
221
222 dn = mapping_dn(talloc_tos(), &sid);
223 if (dn == NULL) {
224 goto failed;
225 }
226
227 ret = ldb_search(ldb, dn, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
228 if (ret != LDB_SUCCESS || res->count != 1) {
229 goto failed;
230 }
231
232 if (!msg_to_group_map(res->msgs[0], map)) {
233 goto failed;
234 }
235
236 result = true;
237 failed:
238 talloc_free(dn);
239 return result;
240}
241
242/*
243 return a group map entry for a given gid
244*/
245static bool get_group_map_from_gid(gid_t gid, GROUP_MAP *map)
246{
247 int ret;
248 struct ldb_result *res=NULL;
249 bool result = false;
250
251 ret = ldb_search(ldb, talloc_tos(), &res, NULL, LDB_SCOPE_SUBTREE,
252 NULL, "(&(gidNumber=%u)(objectClass=groupMap))",
253 (unsigned)gid);
254 if (ret != LDB_SUCCESS || res->count != 1) {
255 goto failed;
256 }
257
258 if (!msg_to_group_map(res->msgs[0], map)) {
259 goto failed;
260 }
261
262 result = true;
263failed:
264 TALLOC_FREE(res);
265 return result;
266}
267
268/*
269 Return the sid and the type of the unix group.
270*/
271static bool get_group_map_from_ntname(const char *name, GROUP_MAP *map)
272{
273 int ret;
274 struct ldb_result *res=NULL;
275 bool result = false;
276
277 ret = ldb_search(ldb, talloc_tos(), &res, NULL, LDB_SCOPE_SUBTREE,
278 NULL, "(&(ntName=%s)(objectClass=groupMap))", name);
279 if (ret != LDB_SUCCESS || res->count != 1) {
280 goto failed;
281 }
282
283 if (!msg_to_group_map(res->msgs[0], map)) {
284 goto failed;
285 }
286
287 result = true;
288 failed:
289 TALLOC_FREE(res);
290 return result;
291}
292
293/*
294 Remove a group mapping entry.
295*/
296static bool group_map_remove(const DOM_SID *sid)
297{
298 struct ldb_dn *dn;
299 int ret;
300
301 dn = mapping_dn(ldb, sid);
302 if (dn == NULL) {
303 return False;
304 }
305 ret = ldb_delete(ldb, dn);
306 talloc_free(dn);
307
308 return ret == LDB_SUCCESS;
309}
310
311
312/*
313 Enumerate the group mappings for a domain
314*/
315static bool enum_group_mapping(const DOM_SID *domsid, enum lsa_SidType sid_name_use,
316 GROUP_MAP **pp_rmap,
317 size_t *p_num_entries, bool unix_only)
318{
319 int i, ret;
320 fstring name;
321 struct ldb_result *res = NULL;
322 struct ldb_dn *basedn=NULL;
323 TALLOC_CTX *tmp_ctx;
324
325 tmp_ctx = talloc_new(ldb);
326 if (tmp_ctx == NULL) goto failed;
327
328 /* we do a subtree search on the domain */
329 if (domsid != NULL) {
330 sid_to_fstring(name, domsid);
331 basedn = ldb_dn_new_fmt(tmp_ctx, ldb, "domain=%s", name);
332 if (basedn == NULL) goto failed;
333 }
334
335 if (sid_name_use == SID_NAME_UNKNOWN) {
336 ret = ldb_search(ldb, tmp_ctx, &res, basedn, LDB_SCOPE_SUBTREE,
337 NULL, "(&(objectClass=groupMap))");
338 } else {
339 ret = ldb_search(ldb, tmp_ctx, &res, basedn, LDB_SCOPE_SUBTREE,
340 NULL, "(&(sidNameUse=%u)(objectClass=groupMap))",
341 sid_name_use);
342 }
343
344 if (ret != LDB_SUCCESS) goto failed;
345
346 (*pp_rmap) = NULL;
347 *p_num_entries = 0;
348
349 for (i=0;i<res->count;i++) {
350 (*pp_rmap) = SMB_REALLOC_ARRAY((*pp_rmap), GROUP_MAP,
351 (*p_num_entries)+1);
352 if (!(*pp_rmap)) goto failed;
353
354 if (!msg_to_group_map(res->msgs[i], &(*pp_rmap)[*p_num_entries])) {
355 goto failed;
356 }
357
358 (*p_num_entries)++;
359 }
360
361 talloc_free(tmp_ctx);
362 return True;
363
364failed:
365 talloc_free(tmp_ctx);
366 return False;
367}
368
369/*
370 This operation happens on session setup, so it should better be fast. We
371 store a list of aliases a SID is member of hanging off MEMBEROF/SID.
372*/
373static NTSTATUS one_alias_membership(const DOM_SID *member,
374 DOM_SID **sids, size_t *num)
375{
376 const char *attrs[] = {
377 "sid",
378 NULL
379 };
380 DOM_SID alias;
381 int ret, i;
382 struct ldb_result *res=NULL;
383 fstring string_sid;
384 NTSTATUS status;
385
386 if (!sid_to_fstring(string_sid, member)) {
387 return NT_STATUS_INVALID_PARAMETER;
388 }
389
390 ret = ldb_search(ldb, talloc_tos(), &res, NULL, LDB_SCOPE_SUBTREE,
391 attrs, "(&(member=%s)(objectClass=groupMap))",
392 string_sid);
393 if (ret != LDB_SUCCESS) {
394 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
395 goto failed;
396 }
397
398 for (i=0;i<res->count;i++) {
399 struct ldb_message_element *el;
400 el = ldb_msg_find_element(res->msgs[i], "sid");
401 if (el == NULL || el->num_values != 1) {
402 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
403 goto failed;
404 }
405 string_to_sid(&alias, (char *)el->values[0].data);
406 status = add_sid_to_array_unique(NULL, &alias, sids, num);
407 if (!NT_STATUS_IS_OK(status)) {
408 goto failed;
409 }
410 }
411
412 status = NT_STATUS_OK;
413 failed:
414 TALLOC_FREE(res);
415 return status;
416}
417
418/*
419 add/remove a member field
420*/
421static NTSTATUS modify_aliasmem(const DOM_SID *alias, const DOM_SID *member,
422 int operation)
423{
424 fstring string_sid;
425 int ret;
426 struct ldb_message msg;
427 struct ldb_message_element el;
428 struct ldb_val val;
429 TALLOC_CTX *tmp_ctx;
430 GROUP_MAP map;
431
432 if (!get_group_map_from_sid(*alias, &map)) {
433 sid_to_fstring(string_sid, alias);
434 return NT_STATUS_NO_SUCH_ALIAS;
435 }
436
437 if ((map.sid_name_use != SID_NAME_ALIAS) &&
438 (map.sid_name_use != SID_NAME_WKN_GRP)) {
439 DEBUG(0,("sid_name_use=%d\n", map.sid_name_use));
440 return NT_STATUS_NO_SUCH_ALIAS;
441 }
442
443 tmp_ctx = talloc_new(NULL);
444 if (tmp_ctx == NULL) {
445 return NT_STATUS_NO_MEMORY;
446 }
447
448 msg.dn = mapping_dn(tmp_ctx, alias);
449 if (msg.dn == NULL) {
450 return NT_STATUS_NO_MEMORY;
451 }
452 msg.num_elements = 1;
453 msg.elements = &el;
454 el.flags = operation;
455 el.name = talloc_strdup(tmp_ctx, "member");
456 el.num_values = 1;
457 el.values = &val;
458 sid_to_fstring(string_sid, member);
459 val.data = (uint8_t *)string_sid;
460 val.length = strlen(string_sid);
461
462 ret = ldb_modify(ldb, &msg);
463 talloc_free(tmp_ctx);
464
465 if (ret == LDB_ERR_NO_SUCH_OBJECT) {
466 return NT_STATUS_NO_SUCH_ALIAS;
467 }
468
469 if (operation == LDB_FLAG_MOD_ADD &&
470 ret == LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS) {
471 return NT_STATUS_MEMBER_IN_ALIAS;
472 }
473
474 return (ret == LDB_SUCCESS ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED);
475}
476
477static NTSTATUS add_aliasmem(const DOM_SID *alias, const DOM_SID *member)
478{
479 return modify_aliasmem(alias, member, LDB_FLAG_MOD_ADD);
480}
481
482static NTSTATUS del_aliasmem(const DOM_SID *alias, const DOM_SID *member)
483{
484 return modify_aliasmem(alias, member, LDB_FLAG_MOD_DELETE);
485}
486
487
488/*
489 enumerate sids that have the given alias set in member
490*/
491static NTSTATUS enum_aliasmem(const DOM_SID *alias, TALLOC_CTX *mem_ctx,
492 DOM_SID **sids, size_t *num)
493{
494 const char *attrs[] = {
495 "member",
496 NULL
497 };
498 int ret, i;
499 NTSTATUS status = NT_STATUS_OK;
500 struct ldb_result *res=NULL;
501 struct ldb_dn *dn;
502 struct ldb_message_element *el;
503
504 *sids = NULL;
505 *num = 0;
506
507 dn = mapping_dn(ldb, alias);
508 if (dn == NULL) {
509 return NT_STATUS_NO_MEMORY;
510 }
511
512 ret = ldb_search(ldb, ldb, &res, dn, LDB_SCOPE_BASE, attrs, NULL);
513 if (ret == LDB_SUCCESS && res->count == 0) {
514 talloc_free(res);
515 talloc_free(dn);
516 return NT_STATUS_OK;
517 }
518 if (ret != LDB_SUCCESS) {
519 talloc_free(dn);
520 return NT_STATUS_INTERNAL_DB_CORRUPTION;
521 }
522
523 talloc_steal(dn, res);
524 el = ldb_msg_find_element(res->msgs[0], "member");
525 if (el == NULL) {
526 talloc_free(dn);
527 return NT_STATUS_OK;
528 }
529
530 for (i=0;i<el->num_values;i++) {
531 DOM_SID sid;
532 string_to_sid(&sid, (const char *)el->values[i].data);
533 status = add_sid_to_array_unique(mem_ctx, &sid, sids, num);
534 if (!NT_STATUS_IS_OK(status)) {
535 goto done;
536 }
537 }
538
539done:
540 talloc_free(dn);
541 return status;
542}
543
544/*
545 upgrade one group mapping record from the old tdb format
546*/
547static int upgrade_map_record(TDB_CONTEXT *tdb_ctx, TDB_DATA key,
548 TDB_DATA data, void *state)
549{
550 int ret;
551 GROUP_MAP map;
552
553 if (strncmp((char *)key.dptr, GROUP_PREFIX,
554 MIN(key.dsize, strlen(GROUP_PREFIX))) != 0) {
555 return 0;
556 }
557
558 if (!string_to_sid(&map.sid, strlen(GROUP_PREFIX) + (const char *)key.dptr)) {
559 DEBUG(0,("Bad sid key '%s' during upgrade\n", (const char *)key.dptr));
560 *(int *)state = -1;
561 return -1;
562 }
563
564 ret = tdb_unpack(data.dptr, data.dsize, "ddff",
565 &map.gid, &map.sid_name_use, &map.nt_name, &map.comment);
566 if (ret == -1) {
567 DEBUG(0,("Failed to unpack group map record during upgrade\n"));
568 *(int *)state = -1;
569 return -1;
570 }
571
572 if ((int)map.gid == -1) {
573 /*
574 * Ignore old invalid mappings
575 */
576 return 0;
577 }
578
579 if (!add_mapping_entry(&map, 0)) {
580 DEBUG(0,("Failed to add mapping entry during upgrade\n"));
581 *(int *)state = -1;
582 return -1;
583 }
584
585 return 0;
586}
587
588/*
589 upgrade one alias record from the old tdb format
590*/
591static int upgrade_alias_record(TDB_CONTEXT *tdb_ctx, TDB_DATA key,
592 TDB_DATA data, void *state)
593{
594 const char *p = (const char *)data.dptr;
595 char *string_sid;
596 DOM_SID member;
597 TALLOC_CTX *frame;
598
599 if (strncmp((char *)key.dptr, MEMBEROF_PREFIX,
600 MIN(key.dsize, strlen(MEMBEROF_PREFIX))) != 0) {
601 return 0;
602 }
603
604 if (!string_to_sid(&member, strlen(MEMBEROF_PREFIX) + (const char *)key.dptr)) {
605 DEBUG(0,("Bad alias key %s during upgrade\n",
606 (const char *)key.dptr));
607 *(int *)state = -1;
608 }
609
610 frame = talloc_stackframe();
611 while (next_token_talloc(frame,&p, &string_sid, " ")) {
612 DOM_SID alias;
613 NTSTATUS status;
614 string_to_sid(&alias, string_sid);
615 status = add_aliasmem(&alias, &member);
616 if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_ALIAS)) {
617 DEBUG(0,("Ignoring orphaned alias record '%s'\n",
618 string_sid));
619 } else if (!NT_STATUS_IS_OK(status)) {
620 DEBUG(0,("Failed to add alias member during upgrade - %s\n",
621 nt_errstr(status)));
622 *(int *)state = -1;
623 TALLOC_FREE(frame);
624 return -1;
625 }
626 }
627 TALLOC_FREE(frame);
628 return 0;
629}
630
631/*
632 upgrade from a old style tdb
633*/
634static bool mapping_upgrade(const char *tdb_path)
635{
636 static TDB_CONTEXT *tdb;
637 int ret, status=0;
638
639 tdb = tdb_open_log(tdb_path, 0, TDB_DEFAULT, O_RDWR, 0600);
640 if (tdb == NULL) goto failed;
641
642 /* we have to do the map records first, as alias records may
643 reference them */
644 ret = tdb_traverse(tdb, upgrade_map_record, &status);
645 if (ret == -1 || status == -1) goto failed;
646
647 ret = tdb_traverse(tdb, upgrade_alias_record, &status);
648 if (ret == -1 || status == -1) goto failed;
649
650 if (tdb) {
651 tdb_close(tdb);
652 tdb = NULL;
653 }
654
655 {
656 const char *old_path = tdb_path;
657 char *new_path = state_path("group_mapping.tdb.upgraded");
658
659 if (!new_path) {
660 goto failed;
661 }
662 if (rename(old_path, new_path) != 0) {
663 DEBUG(0,("Failed to rename old group mapping database\n"));
664 goto failed;
665 }
666 }
667 return True;
668
669failed:
670 DEBUG(0,("Failed to upgrade group mapping database\n"));
671 if (tdb) tdb_close(tdb);
672 return False;
673}
674
675
676
677static const struct mapping_backend ldb_backend = {
678 .add_mapping_entry = add_mapping_entry,
679 .get_group_map_from_sid = get_group_map_from_sid,
680 .get_group_map_from_gid = get_group_map_from_gid,
681 .get_group_map_from_ntname = get_group_map_from_ntname,
682 .group_map_remove = group_map_remove,
683 .enum_group_mapping = enum_group_mapping,
684 .one_alias_membership = one_alias_membership,
685 .add_aliasmem = add_aliasmem,
686 .del_aliasmem = del_aliasmem,
687 .enum_aliasmem = enum_aliasmem
688};
689
690/*
691 initialise the ldb mapping backend
692 */
693const struct mapping_backend *groupdb_ldb_init(void)
694{
695 if (!init_group_mapping()) {
696 DEBUG(0,("Failed to initialise ldb mapping backend\n"));
697 return NULL;
698 }
699
700 return &ldb_backend;
701}
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