12b7c682fb7230aeaa8bb8b57c2c9a2ee7a0e500
[tprouty/samba.git] / source / 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 2 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, write to the Free Software
21  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22  */
23
24 #include "includes.h"
25 #include "groupdb/mapping.h"
26
27 static TDB_CONTEXT *tdb; /* used for driver files */
28
29 /****************************************************************************
30  Open the group mapping tdb.
31 ****************************************************************************/
32  BOOL init_group_mapping(void)
33 {
34         const char *vstring = "INFO/version";
35         int32 vers_id;
36         GROUP_MAP *map_table = NULL;
37         size_t num_entries = 0;
38         
39         if (tdb)
40                 return True;
41                 
42         tdb = tdb_open_log(lock_path("group_mapping.tdb"), 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
43         if (!tdb) {
44                 DEBUG(0,("Failed to open group mapping database\n"));
45                 return False;
46         }
47
48         /* handle a Samba upgrade */
49         tdb_lock_bystring(tdb, vstring);
50
51         /* Cope with byte-reversed older versions of the db. */
52         vers_id = tdb_fetch_int32(tdb, vstring);
53         if ((vers_id == DATABASE_VERSION_V1) || (IREV(vers_id) == DATABASE_VERSION_V1)) {
54                 /* Written on a bigendian machine with old fetch_int code. Save as le. */
55                 tdb_store_int32(tdb, vstring, DATABASE_VERSION_V2);
56                 vers_id = DATABASE_VERSION_V2;
57         }
58
59         /* if its an unknown version we remove everthing in the db */
60         
61         if (vers_id != DATABASE_VERSION_V2) {
62                 tdb_traverse(tdb, tdb_traverse_delete_fn, NULL);
63                 tdb_store_int32(tdb, vstring, DATABASE_VERSION_V2);
64         }
65
66         tdb_unlock_bystring(tdb, vstring);
67
68         /* cleanup any map entries with a gid == -1 */
69         
70         if ( enum_group_mapping( NULL, SID_NAME_UNKNOWN, &map_table, &num_entries, False ) ) {
71                 int i;
72                 
73                 for ( i=0; i<num_entries; i++ ) {
74                         if ( map_table[i].gid == -1 ) {
75                                 group_map_remove( &map_table[i].sid );
76                         }
77                 }
78                 
79                 SAFE_FREE( map_table );
80         }
81
82
83         return True;
84 }
85
86 /****************************************************************************
87 ****************************************************************************/
88  BOOL add_mapping_entry(GROUP_MAP *map, int flag)
89 {
90         TDB_DATA kbuf, dbuf;
91         pstring key, buf;
92         fstring string_sid="";
93         int len;
94
95         if(!init_group_mapping()) {
96                 DEBUG(0,("failed to initialize group mapping\n"));
97                 return(False);
98         }
99         
100         sid_to_string(string_sid, &map->sid);
101
102         len = tdb_pack(buf, sizeof(buf), "ddff",
103                         map->gid, map->sid_name_use, map->nt_name, map->comment);
104
105         if (len > sizeof(buf))
106                 return False;
107
108         slprintf(key, sizeof(key), "%s%s", GROUP_PREFIX, string_sid);
109
110         kbuf.dsize = strlen(key)+1;
111         kbuf.dptr = key;
112         dbuf.dsize = len;
113         dbuf.dptr = buf;
114         if (tdb_store(tdb, kbuf, dbuf, flag) != 0) return False;
115
116         return True;
117 }
118
119
120 /****************************************************************************
121  Return the sid and the type of the unix group.
122 ****************************************************************************/
123
124  BOOL get_group_map_from_sid(DOM_SID sid, GROUP_MAP *map)
125 {
126         TDB_DATA kbuf, dbuf;
127         pstring key;
128         fstring string_sid;
129         int ret = 0;
130         
131         if(!init_group_mapping()) {
132                 DEBUG(0,("failed to initialize group mapping\n"));
133                 return(False);
134         }
135
136         /* the key is the SID, retrieving is direct */
137
138         sid_to_string(string_sid, &sid);
139         slprintf(key, sizeof(key), "%s%s", GROUP_PREFIX, string_sid);
140
141         kbuf.dptr = key;
142         kbuf.dsize = strlen(key)+1;
143                 
144         dbuf = tdb_fetch(tdb, kbuf);
145         if (!dbuf.dptr)
146                 return False;
147
148         ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
149                                 &map->gid, &map->sid_name_use, &map->nt_name, &map->comment);
150
151         SAFE_FREE(dbuf.dptr);
152         
153         if ( ret == -1 ) {
154                 DEBUG(3,("get_group_map_from_sid: tdb_unpack failure\n"));
155                 return False;
156         }
157
158         sid_copy(&map->sid, &sid);
159         
160         return True;
161 }
162
163 /****************************************************************************
164  Return the sid and the type of the unix group.
165 ****************************************************************************/
166
167  BOOL get_group_map_from_gid(gid_t gid, GROUP_MAP *map)
168 {
169         TDB_DATA kbuf, dbuf, newkey;
170         fstring string_sid;
171         int ret;
172
173         if(!init_group_mapping()) {
174                 DEBUG(0,("failed to initialize group mapping\n"));
175                 return(False);
176         }
177
178         /* we need to enumerate the TDB to find the GID */
179
180         for (kbuf = tdb_firstkey(tdb); 
181              kbuf.dptr; 
182              newkey = tdb_nextkey(tdb, kbuf), safe_free(kbuf.dptr), kbuf=newkey) {
183
184                 if (strncmp(kbuf.dptr, GROUP_PREFIX, strlen(GROUP_PREFIX)) != 0) continue;
185                 
186                 dbuf = tdb_fetch(tdb, kbuf);
187                 if (!dbuf.dptr)
188                         continue;
189
190                 fstrcpy(string_sid, kbuf.dptr+strlen(GROUP_PREFIX));
191
192                 string_to_sid(&map->sid, string_sid);
193                 
194                 ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
195                                  &map->gid, &map->sid_name_use, &map->nt_name, &map->comment);
196
197                 SAFE_FREE(dbuf.dptr);
198
199                 if ( ret == -1 ) {
200                         DEBUG(3,("get_group_map_from_gid: tdb_unpack failure\n"));
201                         return False;
202                 }
203         
204                 if (gid==map->gid) {
205                         SAFE_FREE(kbuf.dptr);
206                         return True;
207                 }
208         }
209
210         return False;
211 }
212
213 /****************************************************************************
214  Return the sid and the type of the unix group.
215 ****************************************************************************/
216
217  BOOL get_group_map_from_ntname(const char *name, GROUP_MAP *map)
218 {
219         TDB_DATA kbuf, dbuf, newkey;
220         fstring string_sid;
221         int ret;
222
223         if(!init_group_mapping()) {
224                 DEBUG(0,("get_group_map_from_ntname:failed to initialize group mapping\n"));
225                 return(False);
226         }
227
228         /* we need to enumerate the TDB to find the name */
229
230         for (kbuf = tdb_firstkey(tdb); 
231              kbuf.dptr; 
232              newkey = tdb_nextkey(tdb, kbuf), safe_free(kbuf.dptr), kbuf=newkey) {
233
234                 if (strncmp(kbuf.dptr, GROUP_PREFIX, strlen(GROUP_PREFIX)) != 0) continue;
235                 
236                 dbuf = tdb_fetch(tdb, kbuf);
237                 if (!dbuf.dptr)
238                         continue;
239
240                 fstrcpy(string_sid, kbuf.dptr+strlen(GROUP_PREFIX));
241
242                 string_to_sid(&map->sid, string_sid);
243                 
244                 ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
245                                  &map->gid, &map->sid_name_use, &map->nt_name, &map->comment);
246
247                 SAFE_FREE(dbuf.dptr);
248                 
249                 if ( ret == -1 ) {
250                         DEBUG(3,("get_group_map_from_ntname: tdb_unpack failure\n"));
251                         return False;
252                 }
253
254                 if ( strequal(name, map->nt_name) ) {
255                         SAFE_FREE(kbuf.dptr);
256                         return True;
257                 }
258         }
259
260         return False;
261 }
262
263 /****************************************************************************
264  Remove a group mapping entry.
265 ****************************************************************************/
266
267 BOOL group_map_remove(const DOM_SID *sid)
268 {
269         TDB_DATA kbuf, dbuf;
270         pstring key;
271         fstring string_sid;
272         
273         if(!init_group_mapping()) {
274                 DEBUG(0,("failed to initialize group mapping\n"));
275                 return(False);
276         }
277
278         /* the key is the SID, retrieving is direct */
279
280         sid_to_string(string_sid, sid);
281         slprintf(key, sizeof(key), "%s%s", GROUP_PREFIX, string_sid);
282
283         kbuf.dptr = key;
284         kbuf.dsize = strlen(key)+1;
285                 
286         dbuf = tdb_fetch(tdb, kbuf);
287         if (!dbuf.dptr)
288                 return False;
289         
290         SAFE_FREE(dbuf.dptr);
291
292         if(tdb_delete(tdb, kbuf) != TDB_SUCCESS)
293                 return False;
294
295         return True;
296 }
297
298 /****************************************************************************
299  Enumerate the group mapping.
300 ****************************************************************************/
301
302 BOOL enum_group_mapping(const DOM_SID *domsid, enum lsa_SidType sid_name_use, GROUP_MAP **pp_rmap,
303                         size_t *p_num_entries, BOOL unix_only)
304 {
305         TDB_DATA kbuf, dbuf, newkey;
306         fstring string_sid;
307         GROUP_MAP map;
308         GROUP_MAP *mapt;
309         int ret;
310         size_t entries=0;
311         DOM_SID grpsid;
312         uint32 rid;
313
314         if(!init_group_mapping()) {
315                 DEBUG(0,("failed to initialize group mapping\n"));
316                 return(False);
317         }
318
319         *p_num_entries=0;
320         *pp_rmap=NULL;
321
322         for (kbuf = tdb_firstkey(tdb); 
323              kbuf.dptr; 
324              newkey = tdb_nextkey(tdb, kbuf), safe_free(kbuf.dptr), kbuf=newkey) {
325
326                 if (strncmp(kbuf.dptr, GROUP_PREFIX, strlen(GROUP_PREFIX)) != 0)
327                         continue;
328
329                 dbuf = tdb_fetch(tdb, kbuf);
330                 if (!dbuf.dptr)
331                         continue;
332
333                 fstrcpy(string_sid, kbuf.dptr+strlen(GROUP_PREFIX));
334                                 
335                 ret = tdb_unpack(dbuf.dptr, dbuf.dsize, "ddff",
336                                  &map.gid, &map.sid_name_use, &map.nt_name, &map.comment);
337
338                 SAFE_FREE(dbuf.dptr);
339
340                 if ( ret == -1 ) {
341                         DEBUG(3,("enum_group_mapping: tdb_unpack failure\n"));
342                         continue;
343                 }
344         
345                 /* list only the type or everything if UNKNOWN */
346                 if (sid_name_use!=SID_NAME_UNKNOWN  && sid_name_use!=map.sid_name_use) {
347                         DEBUG(11,("enum_group_mapping: group %s is not of the requested type\n", map.nt_name));
348                         continue;
349                 }
350
351                 if (unix_only==ENUM_ONLY_MAPPED && map.gid==-1) {
352                         DEBUG(11,("enum_group_mapping: group %s is non mapped\n", map.nt_name));
353                         continue;
354                 }
355
356                 string_to_sid(&grpsid, string_sid);
357                 sid_copy( &map.sid, &grpsid );
358                 
359                 sid_split_rid( &grpsid, &rid );
360
361                 /* Only check the domain if we were given one */
362
363                 if ( domsid && !sid_equal( domsid, &grpsid ) ) {
364                         DEBUG(11,("enum_group_mapping: group %s is not in domain %s\n", 
365                                 string_sid, sid_string_static(domsid)));
366                         continue;
367                 }
368
369                 DEBUG(11,("enum_group_mapping: returning group %s of "
370                           "type %s\n", map.nt_name,
371                           sid_type_lookup(map.sid_name_use)));
372
373                 (*pp_rmap) = SMB_REALLOC_ARRAY((*pp_rmap), GROUP_MAP, entries+1);
374                 if (!(*pp_rmap)) {
375                         DEBUG(0,("enum_group_mapping: Unable to enlarge group map!\n"));
376                         return False;
377                 }
378
379                 mapt = (*pp_rmap);
380
381                 mapt[entries].gid = map.gid;
382                 sid_copy( &mapt[entries].sid, &map.sid);
383                 mapt[entries].sid_name_use = map.sid_name_use;
384                 fstrcpy(mapt[entries].nt_name, map.nt_name);
385                 fstrcpy(mapt[entries].comment, map.comment);
386
387                 entries++;
388
389         }
390
391         *p_num_entries=entries;
392
393         return True;
394 }
395
396 /* This operation happens on session setup, so it should better be fast. We
397  * store a list of aliases a SID is member of hanging off MEMBEROF/SID. */
398
399  NTSTATUS one_alias_membership(const DOM_SID *member,
400                                DOM_SID **sids, size_t *num)
401 {
402         fstring key, string_sid;
403         TDB_DATA kbuf, dbuf;
404         const char *p;
405
406         if (!init_group_mapping()) {
407                 DEBUG(0,("failed to initialize group mapping\n"));
408                 return NT_STATUS_ACCESS_DENIED;
409         }
410
411         sid_to_string(string_sid, member);
412         slprintf(key, sizeof(key), "%s%s", MEMBEROF_PREFIX, string_sid);
413
414         kbuf.dsize = strlen(key)+1;
415         kbuf.dptr = key;
416
417         dbuf = tdb_fetch(tdb, kbuf);
418
419         if (dbuf.dptr == NULL) {
420                 return NT_STATUS_OK;
421         }
422
423         p = dbuf.dptr;
424
425         while (next_token(&p, string_sid, " ", sizeof(string_sid))) {
426
427                 DOM_SID alias;
428
429                 if (!string_to_sid(&alias, string_sid))
430                         continue;
431
432                 add_sid_to_array_unique(NULL, &alias, sids, num);
433
434                 if (sids == NULL)
435                         return NT_STATUS_NO_MEMORY;
436         }
437
438         SAFE_FREE(dbuf.dptr);
439         return NT_STATUS_OK;
440 }
441
442 static NTSTATUS alias_memberships(const DOM_SID *members, size_t num_members,
443                                   DOM_SID **sids, size_t *num)
444 {
445         size_t i;
446
447         *num = 0;
448         *sids = NULL;
449
450         for (i=0; i<num_members; i++) {
451                 NTSTATUS status = one_alias_membership(&members[i], sids, num);
452                 if (!NT_STATUS_IS_OK(status))
453                         return status;
454         }
455         return NT_STATUS_OK;
456 }
457
458 static BOOL is_aliasmem(const DOM_SID *alias, const DOM_SID *member)
459 {
460         DOM_SID *sids;
461         size_t i, num;
462
463         /* This feels the wrong way round, but the on-disk data structure
464          * dictates it this way. */
465         if (!NT_STATUS_IS_OK(alias_memberships(member, 1, &sids, &num)))
466                 return False;
467
468         for (i=0; i<num; i++) {
469                 if (sid_compare(alias, &sids[i]) == 0) {
470                         SAFE_FREE(sids);
471                         return True;
472                 }
473         }
474         SAFE_FREE(sids);
475         return False;
476 }
477
478
479  NTSTATUS add_aliasmem(const DOM_SID *alias, const DOM_SID *member)
480 {
481         GROUP_MAP map;
482         TDB_DATA kbuf, dbuf;
483         pstring key;
484         fstring string_sid;
485         char *new_memberstring;
486         int result;
487
488         if(!init_group_mapping()) {
489                 DEBUG(0,("failed to initialize group mapping\n"));
490                 return NT_STATUS_ACCESS_DENIED;
491         }
492
493         if (!get_group_map_from_sid(*alias, &map))
494                 return NT_STATUS_NO_SUCH_ALIAS;
495
496         if ( (map.sid_name_use != SID_NAME_ALIAS) &&
497              (map.sid_name_use != SID_NAME_WKN_GRP) )
498                 return NT_STATUS_NO_SUCH_ALIAS;
499
500         if (is_aliasmem(alias, member))
501                 return NT_STATUS_MEMBER_IN_ALIAS;
502
503         sid_to_string(string_sid, member);
504         slprintf(key, sizeof(key), "%s%s", MEMBEROF_PREFIX, string_sid);
505
506         kbuf.dsize = strlen(key)+1;
507         kbuf.dptr = key;
508
509         dbuf = tdb_fetch(tdb, kbuf);
510
511         sid_to_string(string_sid, alias);
512
513         if (dbuf.dptr != NULL) {
514                 asprintf(&new_memberstring, "%s %s", (char *)(dbuf.dptr),
515                          string_sid);
516         } else {
517                 new_memberstring = SMB_STRDUP(string_sid);
518         }
519
520         if (new_memberstring == NULL)
521                 return NT_STATUS_NO_MEMORY;
522
523         SAFE_FREE(dbuf.dptr);
524         dbuf.dsize = strlen(new_memberstring)+1;
525         dbuf.dptr = new_memberstring;
526
527         result = tdb_store(tdb, kbuf, dbuf, 0);
528
529         SAFE_FREE(new_memberstring);
530
531         return (result == 0 ? NT_STATUS_OK : NT_STATUS_ACCESS_DENIED);
532 }
533
534 struct aliasmem_closure {
535         const DOM_SID *alias;
536         DOM_SID **sids;
537         size_t *num;
538 };
539
540 static int collect_aliasmem(TDB_CONTEXT *tdb_ctx, TDB_DATA key, TDB_DATA data,
541                             void *state)
542 {
543         struct aliasmem_closure *closure = (struct aliasmem_closure *)state;
544         const char *p;
545         fstring alias_string;
546
547         if (strncmp(key.dptr, MEMBEROF_PREFIX,
548                     strlen(MEMBEROF_PREFIX)) != 0)
549                 return 0;
550
551         p = data.dptr;
552
553         while (next_token(&p, alias_string, " ", sizeof(alias_string))) {
554
555                 DOM_SID alias, member;
556                 const char *member_string;
557                 
558
559                 if (!string_to_sid(&alias, alias_string))
560                         continue;
561
562                 if (sid_compare(closure->alias, &alias) != 0)
563                         continue;
564
565                 /* Ok, we found the alias we're looking for in the membership
566                  * list currently scanned. The key represents the alias
567                  * member. Add that. */
568
569                 member_string = strchr(key.dptr, '/');
570
571                 /* Above we tested for MEMBEROF_PREFIX which includes the
572                  * slash. */
573
574                 SMB_ASSERT(member_string != NULL);
575                 member_string += 1;
576
577                 if (!string_to_sid(&member, member_string))
578                         continue;
579                 
580                 add_sid_to_array(NULL, &member, closure->sids, closure->num);
581         }
582
583         return 0;
584 }
585
586  NTSTATUS enum_aliasmem(const DOM_SID *alias, DOM_SID **sids, size_t *num)
587 {
588         GROUP_MAP map;
589         struct aliasmem_closure closure;
590
591         if(!init_group_mapping()) {
592                 DEBUG(0,("failed to initialize group mapping\n"));
593                 return NT_STATUS_ACCESS_DENIED;
594         }
595
596         if (!get_group_map_from_sid(*alias, &map))
597                 return NT_STATUS_NO_SUCH_ALIAS;
598
599         if ( (map.sid_name_use != SID_NAME_ALIAS) &&
600              (map.sid_name_use != SID_NAME_WKN_GRP) )
601                 return NT_STATUS_NO_SUCH_ALIAS;
602
603         *sids = NULL;
604         *num = 0;
605
606         closure.alias = alias;
607         closure.sids = sids;
608         closure.num = num;
609
610         tdb_traverse(tdb, collect_aliasmem, &closure);
611         return NT_STATUS_OK;
612 }
613
614  NTSTATUS del_aliasmem(const DOM_SID *alias, const DOM_SID *member)
615 {
616         NTSTATUS result;
617         DOM_SID *sids;
618         size_t i, num;
619         BOOL found = False;
620         char *member_string;
621         TDB_DATA kbuf, dbuf;
622         pstring key;
623         fstring sid_string;
624
625         result = alias_memberships(member, 1, &sids, &num);
626
627         if (!NT_STATUS_IS_OK(result))
628                 return result;
629
630         for (i=0; i<num; i++) {
631                 if (sid_compare(&sids[i], alias) == 0) {
632                         found = True;
633                         break;
634                 }
635         }
636
637         if (!found) {
638                 SAFE_FREE(sids);
639                 return NT_STATUS_MEMBER_NOT_IN_ALIAS;
640         }
641
642         if (i < num)
643                 sids[i] = sids[num-1];
644
645         num -= 1;
646
647         sid_to_string(sid_string, member);
648         slprintf(key, sizeof(key), "%s%s", MEMBEROF_PREFIX, sid_string);
649
650         kbuf.dsize = strlen(key)+1;
651         kbuf.dptr = key;
652
653         if (num == 0)
654                 return tdb_delete(tdb, kbuf) == 0 ?
655                         NT_STATUS_OK : NT_STATUS_UNSUCCESSFUL;
656
657         member_string = SMB_STRDUP("");
658
659         if (member_string == NULL) {
660                 SAFE_FREE(sids);
661                 return NT_STATUS_NO_MEMORY;
662         }
663
664         for (i=0; i<num; i++) {
665                 char *s = member_string;
666
667                 sid_to_string(sid_string, &sids[i]);
668                 asprintf(&member_string, "%s %s", s, sid_string);
669
670                 SAFE_FREE(s);
671                 if (member_string == NULL) {
672                         SAFE_FREE(sids);
673                         return NT_STATUS_NO_MEMORY;
674                 }
675         }
676
677         dbuf.dsize = strlen(member_string)+1;
678         dbuf.dptr = member_string;
679
680         result = tdb_store(tdb, kbuf, dbuf, 0) == 0 ?
681                 NT_STATUS_OK : NT_STATUS_ACCESS_DENIED;
682
683         SAFE_FREE(sids);
684         SAFE_FREE(member_string);
685
686         return result;
687 }
688