1 /*
2 Unix SMB/CIFS implementation.
3
4 idmap TDB backend
5
6 Copyright (C) Tim Potter 2000
7 Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
8 Copyright (C) Jeremy Allison 2006
9 Copyright (C) Simo Sorce 2003-2006
10 Copyright (C) Michael Adam 2009-2010
11
12 This program is free software; you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation; either version 3 of the License, or
15 (at your option) any later version.
16
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
21
22 You should have received a copy of the GNU General Public License
23 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 */
25
26 #include "includes.h"
27 #include "system/filesys.h"
28 #include "winbindd.h"
29 #include "idmap.h"
30 #include "idmap_rw.h"
31 #include "idmap_tdb_common.h"
32 #include "dbwrap/dbwrap.h"
33 #include "dbwrap/dbwrap_open.h"
34 #include "../libcli/security/security.h"
35 #include "util_tdb.h"
36
37 #undef DBGC_CLASS
38 #define DBGC_CLASS DBGC_IDMAP
39
40 /* idmap version determines auto-conversion - this is the database
41 structure version specifier. */
42
43 #define IDMAP_VERSION 2
44
45 /* High water mark keys */
46 #define HWM_GROUP "GROUP HWM"
47 #define HWM_USER "USER HWM"
48
49 struct convert_fn_state {
50 struct db_context *db;
51 bool failed;
52 };
53
54 /*****************************************************************************
55 For idmap conversion: convert one record to new format
56 Ancient versions (eg 2.2.3a) of winbindd_idmap.tdb mapped DOMAINNAME/rid
57 instead of the SID.
58 *****************************************************************************/
convert_fn(struct db_record * rec,void * private_data)59 static int convert_fn(struct db_record *rec, void *private_data)
60 {
61 struct winbindd_domain *domain;
62 char *p;
63 NTSTATUS status;
64 struct dom_sid sid;
65 uint32_t rid;
66 struct dom_sid_buf keystr;
67 fstring dom_name;
68 TDB_DATA key;
69 TDB_DATA key2;
70 TDB_DATA value;
71 struct convert_fn_state *s = (struct convert_fn_state *)private_data;
72
73 key = dbwrap_record_get_key(rec);
74
75 DEBUG(10,("Converting %s\n", (const char *)key.dptr));
76
77 p = strchr((const char *)key.dptr, '/');
78 if (!p)
79 return 0;
80
81 *p = 0;
82 fstrcpy(dom_name, (const char *)key.dptr);
83 *p++ = '/';
84
85 domain = find_domain_from_name(dom_name);
86 if (domain == NULL) {
87 /* We must delete the old record. */
88 DEBUG(0,("Unable to find domain %s\n", dom_name ));
89 DEBUG(0,("deleting record %s\n", (const char *)key.dptr ));
90
91 status = dbwrap_record_delete(rec);
92 if (!NT_STATUS_IS_OK(status)) {
93 DEBUG(0, ("Unable to delete record %s:%s\n",
94 (const char *)key.dptr,
95 nt_errstr(status)));
96 s->failed = true;
97 return -1;
98 }
99
100 return 0;
101 }
102
103 rid = atoi(p);
104
105 sid_compose(&sid, &domain->sid, rid);
106
107 key2 = string_term_tdb_data(dom_sid_str_buf(&sid, &keystr));
108
109 value = dbwrap_record_get_value(rec);
110
111 status = dbwrap_store(s->db, key2, value, TDB_INSERT);
112 if (!NT_STATUS_IS_OK(status)) {
113 DEBUG(0,("Unable to add record %s:%s\n",
114 (const char *)key2.dptr,
115 nt_errstr(status)));
116 s->failed = true;
117 return -1;
118 }
119
120 status = dbwrap_store(s->db, value, key2, TDB_REPLACE);
121 if (!NT_STATUS_IS_OK(status)) {
122 DEBUG(0,("Unable to update record %s:%s\n",
123 (const char *)value.dptr,
124 nt_errstr(status)));
125 s->failed = true;
126 return -1;
127 }
128
129 status = dbwrap_record_delete(rec);
130 if (!NT_STATUS_IS_OK(status)) {
131 DEBUG(0,("Unable to delete record %s:%s\n",
132 (const char *)key.dptr,
133 nt_errstr(status)));
134 s->failed = true;
135 return -1;
136 }
137
138 return 0;
139 }
140
141 /*****************************************************************************
142 Convert the idmap database from an older version.
143 *****************************************************************************/
144
idmap_tdb_upgrade(struct idmap_domain * dom,struct db_context * db)145 static bool idmap_tdb_upgrade(struct idmap_domain *dom, struct db_context *db)
146 {
147 int32_t vers;
148 struct convert_fn_state s;
149 NTSTATUS status;
150
151 status = dbwrap_fetch_int32_bystring(db, "IDMAP_VERSION", &vers);
152 if (!NT_STATUS_IS_OK(status)) {
153 vers = -1;
154 }
155
156 if (IREV(vers) == IDMAP_VERSION) {
157 /* Arrggghh ! Bytereversed - make order independent ! */
158 /*
159 * high and low records were created on a
160 * big endian machine and will need byte-reversing.
161 */
162
163 int32_t wm;
164
165 status = dbwrap_fetch_int32_bystring(db, HWM_USER, &wm);
166 if (!NT_STATUS_IS_OK(status)) {
167 wm = -1;
168 }
169
170 if (wm != -1) {
171 wm = IREV(wm);
172 } else {
173 wm = dom->low_id;
174 }
175
176 status = dbwrap_store_int32_bystring(db, HWM_USER, wm);
177 if (!NT_STATUS_IS_OK(status)) {
178 DEBUG(0, ("Unable to byteswap user hwm in idmap "
179 "database: %s\n", nt_errstr(status)));
180 return False;
181 }
182
183 status = dbwrap_fetch_int32_bystring(db, HWM_GROUP, &wm);
184 if (!NT_STATUS_IS_OK(status)) {
185 wm = -1;
186 }
187
188 if (wm != -1) {
189 wm = IREV(wm);
190 } else {
191 wm = dom->low_id;
192 }
193
194 status = dbwrap_store_int32_bystring(db, HWM_GROUP, wm);
195 if (!NT_STATUS_IS_OK(status)) {
196 DEBUG(0, ("Unable to byteswap group hwm in idmap "
197 "database: %s\n", nt_errstr(status)));
198 return False;
199 }
200 }
201
202 s.db = db;
203 s.failed = false;
204
205 /* the old format stored as DOMAIN/rid - now we store the SID direct */
206 status = dbwrap_traverse(db, convert_fn, &s, NULL);
207
208 if (!NT_STATUS_IS_OK(status)) {
209 DEBUG(0, ("Database traverse failed during conversion\n"));
210 return false;
211 }
212
213 if (s.failed) {
214 DEBUG(0, ("Problem during conversion\n"));
215 return False;
216 }
217
218 status = dbwrap_store_int32_bystring(db, "IDMAP_VERSION",
219 IDMAP_VERSION);
220 if (!NT_STATUS_IS_OK(status)) {
221 DEBUG(0, ("Unable to store idmap version in database: %s\n",
222 nt_errstr(status)));
223 return False;
224 }
225
226 return True;
227 }
228
idmap_tdb_init_hwm(struct idmap_domain * dom)229 static NTSTATUS idmap_tdb_init_hwm(struct idmap_domain *dom)
230 {
231 uint32_t low_uid;
232 uint32_t low_gid;
233 bool update_uid = false;
234 bool update_gid = false;
235 struct idmap_tdb_common_context *ctx;
236 NTSTATUS status;
237
238 ctx = talloc_get_type(dom->private_data,
239 struct idmap_tdb_common_context);
240
241 status = dbwrap_fetch_uint32_bystring(ctx->db, HWM_USER, &low_uid);
242 if (!NT_STATUS_IS_OK(status) || low_uid < dom->low_id) {
243 update_uid = true;
244 }
245
246 status = dbwrap_fetch_uint32_bystring(ctx->db, HWM_GROUP, &low_gid);
247 if (!NT_STATUS_IS_OK(status) || low_gid < dom->low_id) {
248 update_gid = true;
249 }
250
251 if (!update_uid && !update_gid) {
252 return NT_STATUS_OK;
253 }
254
255 if (dbwrap_transaction_start(ctx->db) != 0) {
256 DEBUG(0, ("Unable to start upgrade transaction!\n"));
257 return NT_STATUS_INTERNAL_DB_ERROR;
258 }
259
260 if (update_uid) {
261 status = dbwrap_store_uint32_bystring(ctx->db, HWM_USER,
262 dom->low_id);
263 if (!NT_STATUS_IS_OK(status)) {
264 dbwrap_transaction_cancel(ctx->db);
265 DEBUG(0, ("Unable to initialise user hwm in idmap "
266 "database: %s\n", nt_errstr(status)));
267 return NT_STATUS_INTERNAL_DB_ERROR;
268 }
269 }
270
271 if (update_gid) {
272 status = dbwrap_store_uint32_bystring(ctx->db, HWM_GROUP,
273 dom->low_id);
274 if (!NT_STATUS_IS_OK(status)) {
275 dbwrap_transaction_cancel(ctx->db);
276 DEBUG(0, ("Unable to initialise group hwm in idmap "
277 "database: %s\n", nt_errstr(status)));
278 return NT_STATUS_INTERNAL_DB_ERROR;
279 }
280 }
281
282 if (dbwrap_transaction_commit(ctx->db) != 0) {
283 DEBUG(0, ("Unable to commit upgrade transaction!\n"));
284 return NT_STATUS_INTERNAL_DB_ERROR;
285 }
286
287 return NT_STATUS_OK;
288 }
289
idmap_tdb_open_db(struct idmap_domain * dom)290 static NTSTATUS idmap_tdb_open_db(struct idmap_domain *dom)
291 {
292 NTSTATUS ret;
293 TALLOC_CTX *mem_ctx;
294 char *tdbfile = NULL;
295 struct db_context *db = NULL;
296 int32_t version;
297 bool config_error = false;
298 struct idmap_tdb_common_context *ctx;
299
300 ctx = talloc_get_type(dom->private_data,
301 struct idmap_tdb_common_context);
302
303 if (ctx->db) {
304 /* it is already open */
305 return NT_STATUS_OK;
306 }
307
308 /* use our own context here */
309 mem_ctx = talloc_stackframe();
310
311 /* use the old database if present */
312 tdbfile = state_path(talloc_tos(), "winbindd_idmap.tdb");
313 if (!tdbfile) {
314 DEBUG(0, ("Out of memory!\n"));
315 ret = NT_STATUS_NO_MEMORY;
316 goto done;
317 }
318
319 DEBUG(10,("Opening tdbfile %s\n", tdbfile ));
320
321 /* Open idmap repository */
322 db = db_open(mem_ctx, tdbfile, 0, TDB_DEFAULT, O_RDWR | O_CREAT, 0644,
323 DBWRAP_LOCK_ORDER_1, DBWRAP_FLAG_NONE);
324 if (!db) {
325 DEBUG(0, ("Unable to open idmap database\n"));
326 ret = NT_STATUS_UNSUCCESSFUL;
327 goto done;
328 }
329
330 /* check against earlier versions */
331 ret = dbwrap_fetch_int32_bystring(db, "IDMAP_VERSION", &version);
332 if (!NT_STATUS_IS_OK(ret)) {
333 version = -1;
334 }
335
336 if (version != IDMAP_VERSION) {
337 if (config_error) {
338 DEBUG(0,("Upgrade of IDMAP_VERSION from %d to %d is not "
339 "possible with incomplete configuration\n",
340 version, IDMAP_VERSION));
341 ret = NT_STATUS_UNSUCCESSFUL;
342 goto done;
343 }
344 if (dbwrap_transaction_start(db) != 0) {
345 DEBUG(0, ("Unable to start upgrade transaction!\n"));
346 ret = NT_STATUS_INTERNAL_DB_ERROR;
347 goto done;
348 }
349
350 if (!idmap_tdb_upgrade(dom, db)) {
351 dbwrap_transaction_cancel(db);
352 DEBUG(0, ("Unable to open idmap database, it's in an old format, and upgrade failed!\n"));
353 ret = NT_STATUS_INTERNAL_DB_ERROR;
354 goto done;
355 }
356
357 if (dbwrap_transaction_commit(db) != 0) {
358 DEBUG(0, ("Unable to commit upgrade transaction!\n"));
359 ret = NT_STATUS_INTERNAL_DB_ERROR;
360 goto done;
361 }
362 }
363
364 ctx->db = talloc_move(ctx, &db);
365
366 ret = idmap_tdb_init_hwm(dom);
367
368 done:
369 talloc_free(mem_ctx);
370 return ret;
371 }
372
373 /**********************************************************************
374 IDMAP MAPPING TDB BACKEND
375 **********************************************************************/
376
377 /*****************************
378 Initialise idmap database.
379 *****************************/
380
idmap_tdb_db_init(struct idmap_domain * dom)381 static NTSTATUS idmap_tdb_db_init(struct idmap_domain *dom)
382 {
383 NTSTATUS ret;
384 struct idmap_tdb_common_context *ctx;
385
386 DEBUG(10, ("idmap_tdb_db_init called for domain '%s'\n", dom->name));
387
388 ctx = talloc_zero(dom, struct idmap_tdb_common_context);
389 if ( ! ctx) {
390 DEBUG(0, ("Out of memory!\n"));
391 return NT_STATUS_NO_MEMORY;
392 }
393
394 /* load backend specific configuration here: */
395 #if 0
396 if (strequal(dom->name, "*")) {
397 } else {
398 }
399 #endif
400
401 ctx->rw_ops = talloc_zero(ctx, struct idmap_rw_ops);
402 if (ctx->rw_ops == NULL) {
403 DEBUG(0, ("Out of memory!\n"));
404 ret = NT_STATUS_NO_MEMORY;
405 goto failed;
406 }
407
408 ctx->max_id = dom->high_id;
409 ctx->hwmkey_uid = HWM_USER;
410 ctx->hwmkey_gid = HWM_GROUP;
411
412 ctx->rw_ops->get_new_id = idmap_tdb_common_get_new_id;
413 ctx->rw_ops->set_mapping = idmap_tdb_common_set_mapping;
414
415 dom->private_data = ctx;
416
417 ret = idmap_tdb_open_db(dom);
418 if ( ! NT_STATUS_IS_OK(ret)) {
419 goto failed;
420 }
421
422 return NT_STATUS_OK;
423
424 failed:
425 talloc_free(ctx);
426 return ret;
427 }
428
429 static struct idmap_methods db_methods = {
430 .init = idmap_tdb_db_init,
431 .unixids_to_sids = idmap_tdb_common_unixids_to_sids,
432 .sids_to_unixids = idmap_tdb_common_sids_to_unixids,
433 .allocate_id = idmap_tdb_common_get_new_id,
434 };
435
idmap_tdb_init(TALLOC_CTX * mem_ctx)436 NTSTATUS idmap_tdb_init(TALLOC_CTX *mem_ctx)
437 {
438 DEBUG(10, ("calling idmap_tdb_init\n"));
439
440 return smb_register_idmap(SMB_IDMAP_INTERFACE_VERSION, "tdb", &db_methods);
441 }
442