mapping_tdb: fix enumeration of mappings.
[samba.git] / source3 / groupdb / mapping_tdb.c
1 /* 
2  *  Unix SMB/CIFS implementation.
3  *  RPC Pipe client / server routines
4  *  Copyright (C) Andrew Tridgell              1992-2006,
5  *  Copyright (C) Jean Fran├žois 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
26 static struct db_context *db; /* used for driver files */
27
28 static 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);
30 static bool group_map_remove(const DOM_SID *sid);
31         
32 /****************************************************************************
33  Open the group mapping tdb.
34 ****************************************************************************/
35 static bool init_group_mapping(void)
36 {
37         if (db != NULL) {
38                 return true;
39         }
40
41         db = db_open_trans(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
105 static 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 ****************************************************************************/
122 static 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 NULL;
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), flag);
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
158 static 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
193 static 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
211 struct 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
218 static 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
247 static 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
265 static 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
282 static 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
302 struct 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
311 static 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
354 static 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
380 static 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
414 done:
415         TALLOC_FREE(frame);
416         return status;
417 }
418
419 static 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
435 static 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
456 static 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                 goto cancel;
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
537 struct aliasmem_state {
538         const DOM_SID *alias;
539         DOM_SID **sids;
540         size_t *num;
541 };
542
543 static int collect_aliasmem(struct db_record *rec, void *priv)
544 {
545         struct aliasmem_state *state = (struct aliasmem_state *)priv;
546         const char *p;
547         char *alias_string;
548         TALLOC_CTX *frame;
549
550         if (strncmp((const char *)rec->key.dptr, MEMBEROF_PREFIX,
551                     MEMBEROF_PREFIX_LEN) != 0)
552                 return 0;
553
554         p = (const char *)rec->value.dptr;
555
556         frame = talloc_stackframe();
557
558         while (next_token_talloc(frame, &p, &alias_string, " ")) {
559                 DOM_SID alias, member;
560                 const char *member_string;
561
562                 if (!string_to_sid(&alias, alias_string))
563                         continue;
564
565                 if (sid_compare(state->alias, &alias) != 0)
566                         continue;
567
568                 /* Ok, we found the alias we're looking for in the membership
569                  * list currently scanned. The key represents the alias
570                  * member. Add that. */
571
572                 member_string = strchr((const char *)rec->key.dptr, '/');
573
574                 /* Above we tested for MEMBEROF_PREFIX which includes the
575                  * slash. */
576
577                 SMB_ASSERT(member_string != NULL);
578                 member_string += 1;
579
580                 if (!string_to_sid(&member, member_string))
581                         continue;
582
583                 if (!NT_STATUS_IS_OK(add_sid_to_array(NULL, &member,
584                                                       state->sids,
585                                                       state->num)))
586                 {
587                         /* talloc fail. */
588                         break;
589                 }
590         }
591
592         TALLOC_FREE(frame);
593         return 0;
594 }
595
596 static NTSTATUS enum_aliasmem(const DOM_SID *alias, DOM_SID **sids, size_t *num)
597 {
598         GROUP_MAP map;
599         struct aliasmem_state state;
600
601         if (!get_group_map_from_sid(*alias, &map))
602                 return NT_STATUS_NO_SUCH_ALIAS;
603
604         if ( (map.sid_name_use != SID_NAME_ALIAS) &&
605              (map.sid_name_use != SID_NAME_WKN_GRP) )
606                 return NT_STATUS_NO_SUCH_ALIAS;
607
608         *sids = NULL;
609         *num = 0;
610
611         state.alias = alias;
612         state.sids = sids;
613         state.num = num;
614
615         db->traverse_read(db, collect_aliasmem, &state);
616         return NT_STATUS_OK;
617 }
618
619 static NTSTATUS del_aliasmem(const DOM_SID *alias, const DOM_SID *member)
620 {
621         NTSTATUS status;
622         DOM_SID *sids;
623         size_t i, num;
624         bool found = False;
625         char *member_string;
626         char *key;
627         fstring sid_string;
628
629         if (db->transaction_start(db) != 0) {
630                 DEBUG(0, ("transaction_start failed\n"));
631                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
632         }
633
634         status = alias_memberships(member, 1, &sids, &num);
635
636         if (!NT_STATUS_IS_OK(status)) {
637                 goto cancel;
638         }
639
640         for (i=0; i<num; i++) {
641                 if (sid_compare(&sids[i], alias) == 0) {
642                         found = True;
643                         break;
644                 }
645         }
646
647         if (!found) {
648                 TALLOC_FREE(sids);
649                 status = NT_STATUS_MEMBER_NOT_IN_ALIAS;
650                 goto cancel;
651         }
652
653         if (i < num)
654                 sids[i] = sids[num-1];
655
656         num -= 1;
657
658         sid_to_fstring(sid_string, member);
659
660         key = talloc_asprintf(sids, "%s%s", MEMBEROF_PREFIX, sid_string);
661         if (key == NULL) {
662                 TALLOC_FREE(sids);
663                 status = NT_STATUS_NO_MEMORY;
664                 goto cancel;
665         }
666
667         if (num == 0) {
668                 status = dbwrap_delete_bystring(db, key);
669                 TALLOC_FREE(sids);
670                 goto cancel;
671         }
672
673         member_string = talloc_strdup(sids, "");
674         if (member_string == NULL) {
675                 TALLOC_FREE(sids);
676                 status = NT_STATUS_NO_MEMORY;
677                 goto cancel;
678         }
679
680         for (i=0; i<num; i++) {
681
682                 sid_to_fstring(sid_string, &sids[i]);
683
684                 member_string = talloc_asprintf_append_buffer(
685                         member_string, " %s", sid_string);
686
687                 if (member_string == NULL) {
688                         TALLOC_FREE(sids);
689                         status = NT_STATUS_NO_MEMORY;
690                         goto cancel;
691                 }
692         }
693
694         status = dbwrap_store_bystring(
695                 db, key, string_term_tdb_data(member_string), 0);
696
697         TALLOC_FREE(sids);
698
699         if (!NT_STATUS_IS_OK(status)) {
700                 DEBUG(10, ("dbwrap_store_bystring failed: %s\n",
701                            nt_errstr(status)));
702                 goto cancel;
703         }
704
705         if (db->transaction_commit(db) != 0) {
706                 DEBUG(0, ("transaction_commit failed\n"));
707                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
708                 goto cancel;
709         }
710
711         return NT_STATUS_OK;
712
713  cancel:
714         if (db->transaction_cancel(db) != 0) {
715                 smb_panic("transaction_cancel failed");
716         }
717         return status;
718 }
719
720 static const struct mapping_backend tdb_backend = {
721         .add_mapping_entry         = add_mapping_entry,
722         .get_group_map_from_sid    = get_group_map_from_sid,
723         .get_group_map_from_gid    = get_group_map_from_gid,
724         .get_group_map_from_ntname = get_group_map_from_ntname,
725         .group_map_remove          = group_map_remove,
726         .enum_group_mapping        = enum_group_mapping,
727         .one_alias_membership      = one_alias_membership,
728         .add_aliasmem              = add_aliasmem,
729         .del_aliasmem              = del_aliasmem,
730         .enum_aliasmem             = enum_aliasmem      
731 };
732
733 /*
734   initialise the tdb mapping backend
735  */
736 const struct mapping_backend *groupdb_tdb_init(void)
737 {
738         if (!init_group_mapping()) {
739                 DEBUG(0,("Failed to initialise tdb mapping backend\n"));
740                 return NULL;
741         }
742
743         return &tdb_backend;
744 }