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s3: copy nbt/netlogon helper from s4.
[Samba.git] / source / registry / reg_backend_db.c
blob6f4c614b9a5a003154092cce685668c254b4d912
1 /*
2 * Unix SMB/CIFS implementation.
3 * Virtual Windows Registry Layer
4 * Copyright (C) Gerald Carter 2002-2005
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 */
19
20 /* Implementation of internal registry database functions. */
21
22 #include "includes.h"
23
24 #undef DBGC_CLASS
25 #define DBGC_CLASS DBGC_REGISTRY
26
27 static struct db_context *regdb = NULL;
28 static int regdb_refcount;
29
30 static bool regdb_key_exists(const char *key);
31 static bool regdb_key_is_base_key(const char *key);
32
33 /* List the deepest path into the registry. All part components will be created.*/
34
35 /* If you want to have a part of the path controlled by the tdb and part by
36 a virtual registry db (e.g. printing), then you have to list the deepest path.
37 For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print"
38 allows the reg_db backend to handle everything up to
39 "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook
40 the reg_printing backend onto the last component of the path (see
41 KEY_PRINTING_2K in include/rpc_reg.h) --jerry */
42
43 static const char *builtin_registry_paths[] = {
44 KEY_PRINTING_2K,
45 KEY_PRINTING_PORTS,
46 KEY_PRINTING,
47 KEY_SHARES,
48 KEY_EVENTLOG,
49 KEY_SMBCONF,
50 KEY_PERFLIB,
51 KEY_PERFLIB_009,
52 KEY_GROUP_POLICY,
53 KEY_SAMBA_GROUP_POLICY,
54 KEY_GP_MACHINE_POLICY,
55 KEY_GP_MACHINE_WIN_POLICY,
56 KEY_HKCU,
57 KEY_GP_USER_POLICY,
58 KEY_GP_USER_WIN_POLICY,
59 KEY_WINLOGON_GPEXT_PATH,
60 "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
61 KEY_PROD_OPTIONS,
62 "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
63 KEY_TCPIP_PARAMS,
64 KEY_NETLOGON_PARAMS,
65 KEY_HKU,
66 KEY_HKCR,
67 KEY_HKPD,
68 KEY_HKPT,
69 NULL };
70
71 struct builtin_regkey_value {
72 const char *path;
73 const char *valuename;
74 uint32 type;
75 union {
76 const char *string;
77 uint32 dw_value;
78 } data;
79 };
80
81 static struct builtin_regkey_value builtin_registry_values[] = {
82 { KEY_PRINTING_PORTS,
83 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
84 { KEY_PRINTING_2K,
85 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
86 { KEY_EVENTLOG,
87 "DisplayName", REG_SZ, { "Event Log" } },
88 { KEY_EVENTLOG,
89 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
90 { NULL, NULL, 0, { NULL } }
91 };
92
93 /**
94 * Initialize a key in the registry:
95 * create each component key of the specified path.
96 */
97 static WERROR init_registry_key_internal(const char *add_path)
98 {
99 WERROR werr;
100 TALLOC_CTX *frame = talloc_stackframe();
101 char *path = NULL;
102 char *base = NULL;
103 char *remaining = NULL;
104 char *keyname;
105 char *subkeyname;
106 REGSUBKEY_CTR *subkeys;
107 const char *p, *p2;
108
109 DEBUG(6, ("init_registry_key: Adding [%s]\n", add_path));
110
111 path = talloc_strdup(frame, add_path);
112 base = talloc_strdup(frame, "");
113 if (!path || !base) {
114 werr = WERR_NOMEM;
115 goto fail;
116 }
117 p = path;
118
119 while (next_token_talloc(frame, &p, &keyname, "\\")) {
120
121 /* build up the registry path from the components */
122
123 if (*base) {
124 base = talloc_asprintf(frame, "%s\\", base);
125 if (!base) {
126 werr = WERR_NOMEM;
127 goto fail;
128 }
129 }
130 base = talloc_asprintf_append(base, "%s", keyname);
131 if (!base) {
132 werr = WERR_NOMEM;
133 goto fail;
134 }
135
136 /* get the immediate subkeyname (if we have one ) */
137
138 subkeyname = talloc_strdup(frame, "");
139 if (!subkeyname) {
140 werr = WERR_NOMEM;
141 goto fail;
142 }
143 if (*p) {
144 remaining = talloc_strdup(frame, p);
145 if (!remaining) {
146 werr = WERR_NOMEM;
147 goto fail;
148 }
149 p2 = remaining;
150
151 if (!next_token_talloc(frame, &p2,
152 &subkeyname, "\\"))
153 {
154 subkeyname = talloc_strdup(frame,p2);
155 if (!subkeyname) {
156 werr = WERR_NOMEM;
157 goto fail;
158 }
159 }
160 }
161
162 DEBUG(10,("init_registry_key: Storing key [%s] with "
163 "subkey [%s]\n", base,
164 *subkeyname ? subkeyname : "NULL"));
165
166 /* we don't really care if the lookup succeeds or not
167 * since we are about to update the record.
168 * We just want any subkeys already present */
169
170 if (!(subkeys = TALLOC_ZERO_P(frame, REGSUBKEY_CTR))) {
171 DEBUG(0,("talloc() failure!\n"));
172 werr = WERR_NOMEM;
173 goto fail;
174 }
175
176 regdb_fetch_keys(base, subkeys);
177 if (*subkeyname) {
178 werr = regsubkey_ctr_addkey(subkeys, subkeyname);
179 if (!W_ERROR_IS_OK(werr)) {
180 goto fail;
181 }
182 }
183 if (!regdb_store_keys( base, subkeys)) {
184 werr = WERR_CAN_NOT_COMPLETE;
185 goto fail;
186 }
187 }
188
189 werr = WERR_OK;
190
191 fail:
192 TALLOC_FREE(frame);
193 return werr;
194 }
195
196 /**
197 * Initialize a key in the registry:
198 * create each component key of the specified path,
199 * wrapped in one db transaction.
200 */
201 WERROR init_registry_key(const char *add_path)
202 {
203 WERROR werr;
204
205 if (regdb_key_exists(add_path)) {
206 return WERR_OK;
207 }
208
209 if (regdb->transaction_start(regdb) != 0) {
210 DEBUG(0, ("init_registry_key: transaction_start failed\n"));
211 return WERR_REG_IO_FAILURE;
212 }
213
214 werr = init_registry_key_internal(add_path);
215 if (!W_ERROR_IS_OK(werr)) {
216 goto fail;
217 }
218
219 if (regdb->transaction_commit(regdb) != 0) {
220 DEBUG(0, ("init_registry_key: Could not commit transaction\n"));
221 return WERR_REG_IO_FAILURE;
222 }
223
224 return WERR_OK;
225
226 fail:
227 if (regdb->transaction_cancel(regdb) != 0) {
228 smb_panic("init_registry_key: transaction_cancel failed\n");
229 }
230
231 return werr;
232 }
233
234 /***********************************************************************
235 Open the registry data in the tdb
236 ***********************************************************************/
237
238 WERROR init_registry_data(void)
239 {
240 WERROR werr;
241 TALLOC_CTX *frame = talloc_stackframe();
242 REGVAL_CTR *values;
243 int i;
244 UNISTR2 data;
245
246 /*
247 * First, check for the existence of the needed keys and values.
248 * If all do already exist, we can save the writes.
249 */
250 for (i=0; builtin_registry_paths[i] != NULL; i++) {
251 if (!regdb_key_exists(builtin_registry_paths[i])) {
252 goto do_init;
253 }
254 }
255
256 for (i=0; builtin_registry_values[i].path != NULL; i++) {
257 values = TALLOC_ZERO_P(frame, REGVAL_CTR);
258 if (values == NULL) {
259 werr = WERR_NOMEM;
260 goto done;
261 }
262
263 regdb_fetch_values(builtin_registry_values[i].path, values);
264 if (!regval_ctr_key_exists(values,
265 builtin_registry_values[i].valuename))
266 {
267 TALLOC_FREE(values);
268 goto do_init;
269 }
270
271 TALLOC_FREE(values);
272 }
273
274 werr = WERR_OK;
275 goto done;
276
277 do_init:
278
279 /*
280 * There are potentially quite a few store operations which are all
281 * indiviually wrapped in tdb transactions. Wrapping them in a single
282 * transaction gives just a single transaction_commit() to actually do
283 * its fsync()s. See tdb/common/transaction.c for info about nested
284 * transaction behaviour.
285 */
286
287 if (regdb->transaction_start(regdb) != 0) {
288 DEBUG(0, ("init_registry_data: tdb_transaction_start "
289 "failed\n"));
290 werr = WERR_REG_IO_FAILURE;
291 goto done;
292 }
293
294 /* loop over all of the predefined paths and add each component */
295
296 for (i=0; builtin_registry_paths[i] != NULL; i++) {
297 if (regdb_key_exists(builtin_registry_paths[i])) {
298 continue;
299 }
300 werr = init_registry_key_internal(builtin_registry_paths[i]);
301 if (!W_ERROR_IS_OK(werr)) {
302 goto fail;
303 }
304 }
305
306 /* loop over all of the predefined values and add each component */
307
308 for (i=0; builtin_registry_values[i].path != NULL; i++) {
309
310 values = TALLOC_ZERO_P(frame, REGVAL_CTR);
311 if (values == NULL) {
312 werr = WERR_NOMEM;
313 goto fail;
314 }
315
316 regdb_fetch_values(builtin_registry_values[i].path, values);
317
318 /* preserve existing values across restarts. Only add new ones */
319
320 if (!regval_ctr_key_exists(values,
321 builtin_registry_values[i].valuename))
322 {
323 switch(builtin_registry_values[i].type) {
324 case REG_DWORD:
325 regval_ctr_addvalue(values,
326 builtin_registry_values[i].valuename,
327 REG_DWORD,
328 (char*)&builtin_registry_values[i].data.dw_value,
329 sizeof(uint32));
330 break;
331
332 case REG_SZ:
333 init_unistr2(&data,
334 builtin_registry_values[i].data.string,
335 UNI_STR_TERMINATE);
336 regval_ctr_addvalue(values,
337 builtin_registry_values[i].valuename,
338 REG_SZ,
339 (char*)data.buffer,
340 data.uni_str_len*sizeof(uint16));
341 break;
342
343 default:
344 DEBUG(0, ("init_registry_data: invalid value "
345 "type in builtin_registry_values "
346 "[%d]\n",
347 builtin_registry_values[i].type));
348 }
349 regdb_store_values(builtin_registry_values[i].path,
350 values);
351 }
352 TALLOC_FREE(values);
353 }
354
355 if (regdb->transaction_commit(regdb) != 0) {
356 DEBUG(0, ("init_registry_data: Could not commit "
357 "transaction\n"));
358 werr = WERR_REG_IO_FAILURE;
359 } else {
360 werr = WERR_OK;
361 }
362
363 goto done;
364
365 fail:
366 if (regdb->transaction_cancel(regdb) != 0) {
367 smb_panic("init_registry_data: tdb_transaction_cancel "
368 "failed\n");
369 }
370
371 done:
372 TALLOC_FREE(frame);
373 return werr;
374 }
375
376 /***********************************************************************
377 Open the registry database
378 ***********************************************************************/
379
380 WERROR regdb_init(void)
381 {
382 const char *vstring = "INFO/version";
383 uint32 vers_id;
384 WERROR werr;
385
386 if (regdb) {
387 DEBUG(10, ("regdb_init: incrementing refcount (%d)\n",
388 regdb_refcount));
389 regdb_refcount++;
390 return WERR_OK;
391 }
392
393 regdb = db_open(NULL, state_path("registry.tdb"), 0,
394 REG_TDB_FLAGS, O_RDWR, 0600);
395 if (!regdb) {
396 regdb = db_open(NULL, state_path("registry.tdb"), 0,
397 REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
398 if (!regdb) {
399 werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
400 DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n",
401 state_path("registry.tdb"), strerror(errno) ));
402 return werr;
403 }
404
405 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
406 }
407
408 regdb_refcount = 1;
409
410 vers_id = dbwrap_fetch_int32(regdb, vstring);
411
412 if ( vers_id != REGVER_V1 ) {
413 NTSTATUS status;
414 /* any upgrade code here if needed */
415 DEBUG(10, ("regdb_init: got %s = %d != %d\n", vstring,
416 vers_id, REGVER_V1));
417 status = dbwrap_trans_store_int32(regdb, vstring, REGVER_V1);
418 if (!NT_STATUS_IS_OK(status)) {
419 DEBUG(1, ("regdb_init: error storing %s = %d: %s\n",
420 vstring, REGVER_V1, nt_errstr(status)));
421 return ntstatus_to_werror(status);
422 } else {
423 DEBUG(10, ("regdb_init: stored %s = %d\n",
424 vstring, REGVER_V1));
425 }
426 }
427
428 return WERR_OK;
429 }
430
431 /***********************************************************************
432 Open the registry. Must already have been initialized by regdb_init()
433 ***********************************************************************/
434
435 WERROR regdb_open( void )
436 {
437 WERROR result = WERR_OK;
438
439 if ( regdb ) {
440 DEBUG(10,("regdb_open: incrementing refcount (%d)\n", regdb_refcount));
441 regdb_refcount++;
442 return WERR_OK;
443 }
444
445 become_root();
446
447 regdb = db_open(NULL, state_path("registry.tdb"), 0,
448 REG_TDB_FLAGS, O_RDWR, 0600);
449 if ( !regdb ) {
450 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
451 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
452 state_path("registry.tdb"), strerror(errno) ));
453 }
454
455 unbecome_root();
456
457 regdb_refcount = 1;
458 DEBUG(10,("regdb_open: refcount reset (%d)\n", regdb_refcount));
459
460 return result;
461 }
462
463 /***********************************************************************
464 ***********************************************************************/
465
466 int regdb_close( void )
467 {
468 if (regdb_refcount == 0) {
469 return 0;
470 }
471
472 regdb_refcount--;
473
474 DEBUG(10,("regdb_close: decrementing refcount (%d)\n", regdb_refcount));
475
476 if ( regdb_refcount > 0 )
477 return 0;
478
479 SMB_ASSERT( regdb_refcount >= 0 );
480
481 TALLOC_FREE(regdb);
482 return 0;
483 }
484
485 /***********************************************************************
486 return the tdb sequence number of the registry tdb.
487 this is an indicator for the content of the registry
488 having changed. it will change upon regdb_init, too, though.
489 ***********************************************************************/
490 int regdb_get_seqnum(void)
491 {
492 return regdb->get_seqnum(regdb);
493 }
494
495 /***********************************************************************
496 Add subkey strings to the registry tdb under a defined key
497 fmt is the same format as tdb_pack except this function only supports
498 fstrings
499 ***********************************************************************/
500
501 static bool regdb_store_keys_internal(const char *key, REGSUBKEY_CTR *ctr)
502 {
503 TDB_DATA dbuf;
504 uint8 *buffer = NULL;
505 int i = 0;
506 uint32 len, buflen;
507 bool ret = true;
508 uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
509 char *keyname = NULL;
510 TALLOC_CTX *ctx = talloc_stackframe();
511 NTSTATUS status;
512
513 if (!key) {
514 return false;
515 }
516
517 keyname = talloc_strdup(ctx, key);
518 if (!keyname) {
519 return false;
520 }
521 keyname = normalize_reg_path(ctx, keyname);
522
523 /* allocate some initial memory */
524
525 buffer = (uint8 *)SMB_MALLOC(1024);
526 if (buffer == NULL) {
527 return false;
528 }
529 buflen = 1024;
530 len = 0;
531
532 /* store the number of subkeys */
533
534 len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
535
536 /* pack all the strings */
537
538 for (i=0; i<num_subkeys; i++) {
539 len += tdb_pack(buffer+len, buflen-len, "f",
540 regsubkey_ctr_specific_key(ctr, i));
541 if (len > buflen) {
542 /* allocate some extra space */
543 buffer = (uint8 *)SMB_REALLOC(buffer, len*2);
544 if(buffer == NULL) {
545 DEBUG(0, ("regdb_store_keys: Failed to realloc "
546 "memory of size [%d]\n", len*2));
547 ret = false;
548 goto done;
549 }
550 buflen = len*2;
551 len = tdb_pack(buffer+len, buflen-len, "f",
552 regsubkey_ctr_specific_key(ctr, i));
553 }
554 }
555
556 /* finally write out the data */
557
558 dbuf.dptr = buffer;
559 dbuf.dsize = len;
560 status = dbwrap_store_bystring(regdb, keyname, dbuf, TDB_REPLACE);
561 if (!NT_STATUS_IS_OK(status)) {
562 ret = false;
563 goto done;
564 }
565
566 done:
567 TALLOC_FREE(ctx);
568 SAFE_FREE(buffer);
569 return ret;
570 }
571
572 /***********************************************************************
573 Store the new subkey record and create any child key records that
574 do not currently exist
575 ***********************************************************************/
576
577 bool regdb_store_keys(const char *key, REGSUBKEY_CTR *ctr)
578 {
579 int num_subkeys, i;
580 char *path = NULL;
581 REGSUBKEY_CTR *subkeys = NULL, *old_subkeys = NULL;
582 char *oldkeyname = NULL;
583 TALLOC_CTX *ctx = talloc_stackframe();
584 NTSTATUS status;
585
586 if (!regdb_key_is_base_key(key) && !regdb_key_exists(key)) {
587 goto fail;
588 }
589
590 /*
591 * fetch a list of the old subkeys so we can determine if anything has
592 * changed
593 */
594
595 if (!(old_subkeys = TALLOC_ZERO_P(ctx, REGSUBKEY_CTR))) {
596 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
597 return false;
598 }
599
600 regdb_fetch_keys(key, old_subkeys);
601
602 if ((ctr->num_subkeys && old_subkeys->num_subkeys) &&
603 (ctr->num_subkeys == old_subkeys->num_subkeys)) {
604
605 for (i = 0; i<ctr->num_subkeys; i++) {
606 if (strcmp(ctr->subkeys[i],
607 old_subkeys->subkeys[i]) != 0) {
608 break;
609 }
610 }
611 if (i == ctr->num_subkeys) {
612 /*
613 * Nothing changed, no point to even start a tdb
614 * transaction
615 */
616 TALLOC_FREE(old_subkeys);
617 return true;
618 }
619 }
620
621 TALLOC_FREE(old_subkeys);
622
623 if (regdb->transaction_start(regdb) != 0) {
624 DEBUG(0, ("regdb_store_keys: transaction_start failed\n"));
625 goto fail;
626 }
627
628 /*
629 * Re-fetch the old keys inside the transaction
630 */
631
632 if (!(old_subkeys = TALLOC_ZERO_P(ctx, REGSUBKEY_CTR))) {
633 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
634 goto cancel;
635 }
636
637 regdb_fetch_keys(key, old_subkeys);
638
639 /*
640 * Make the store operation as safe as possible without transactions:
641 *
642 * (1) For each subkey removed from ctr compared with old_subkeys:
643 *
644 * (a) First delete the value db entry.
645 *
646 * (b) Next delete the secdesc db record.
647 *
648 * (c) Then delete the subkey list entry.
649 *
650 * (2) Now write the list of subkeys of the parent key,
651 * deleting removed entries and adding new ones.
652 *
653 * (3) Finally create the subkey list entries for the added keys.
654 *
655 * This way if we crash half-way in between deleting the subkeys
656 * and storing the parent's list of subkeys, no old data can pop up
657 * out of the blue when re-adding keys later on.
658 */
659
660 /* (1) delete removed keys' lists (values/secdesc/subkeys) */
661
662 num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
663 for (i=0; i<num_subkeys; i++) {
664 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
665
666 if (regsubkey_ctr_key_exists(ctr, oldkeyname)) {
667 /*
668 * It's still around, don't delete
669 */
670
671 continue;
672 }
673
674 /* (a) Delete the value list for this key */
675
676 path = talloc_asprintf(ctx, "%s/%s/%s",
677 REG_VALUE_PREFIX,
678 key,
679 oldkeyname );
680 if (!path) {
681 goto cancel;
682 }
683 path = normalize_reg_path(ctx, path);
684 if (!path) {
685 goto cancel;
686 }
687 /* Ignore errors here, we might have no values around */
688 dbwrap_delete_bystring(regdb, path);
689 TALLOC_FREE(path);
690
691 /* (b) Delete the secdesc for this key */
692
693 path = talloc_asprintf(ctx, "%s/%s/%s",
694 REG_SECDESC_PREFIX,
695 key,
696 oldkeyname );
697 if (!path) {
698 goto cancel;
699 }
700 path = normalize_reg_path(ctx, path);
701 if (!path) {
702 goto cancel;
703 }
704 status = dbwrap_delete_bystring(regdb, path);
705 /* Don't fail if there are no values around. */
706 if (!NT_STATUS_IS_OK(status) &&
707 !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND))
708 {
709 DEBUG(1, ("Deleting %s failed: %s\n", path,
710 nt_errstr(status)));
711 goto cancel;
712 }
713 TALLOC_FREE(path);
714
715 /* (c) Delete the list of subkeys of this key */
716
717 path = talloc_asprintf(ctx, "%s/%s", key, oldkeyname);
718 if (!path) {
719 goto cancel;
720 }
721 path = normalize_reg_path(ctx, path);
722 if (!path) {
723 goto cancel;
724 }
725 status = dbwrap_delete_bystring(regdb, path);
726 /* Don't fail if the subkey record was not found. */
727 if (!NT_STATUS_IS_OK(status) &&
728 !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND))
729 {
730 DEBUG(1, ("Deleting %s failed: %s\n", path,
731 nt_errstr(status)));
732 goto cancel;
733 }
734 TALLOC_FREE(path);
735 }
736
737 TALLOC_FREE(old_subkeys);
738
739 /* (2) store the subkey list for the parent */
740
741 if (!regdb_store_keys_internal(key, ctr) ) {
742 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
743 "for parent [%s]\n", key));
744 goto cancel;
745 }
746
747 /* (3) now create records for any subkeys that don't already exist */
748
749 num_subkeys = regsubkey_ctr_numkeys(ctr);
750
751 if (num_subkeys == 0) {
752 if (!(subkeys = TALLOC_ZERO_P(ctx, REGSUBKEY_CTR)) ) {
753 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
754 goto cancel;
755 }
756
757 if (!regdb_store_keys_internal(key, subkeys)) {
758 DEBUG(0,("regdb_store_keys: Failed to store "
759 "new record for key [%s]\n", key));
760 goto cancel;
761 }
762 TALLOC_FREE(subkeys);
763
764 }
765
766 for (i=0; i<num_subkeys; i++) {
767 path = talloc_asprintf(ctx, "%s/%s",
768 key,
769 regsubkey_ctr_specific_key(ctr, i));
770 if (!path) {
771 goto cancel;
772 }
773 if (!(subkeys = TALLOC_ZERO_P(ctx, REGSUBKEY_CTR)) ) {
774 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
775 goto cancel;
776 }
777
778 if (regdb_fetch_keys( path, subkeys ) == -1) {
779 /* create a record with 0 subkeys */
780 if (!regdb_store_keys_internal(path, subkeys)) {
781 DEBUG(0,("regdb_store_keys: Failed to store "
782 "new record for key [%s]\n", path));
783 goto cancel;
784 }
785 }
786
787 TALLOC_FREE(subkeys);
788 TALLOC_FREE(path);
789 }
790
791 if (regdb->transaction_commit(regdb) != 0) {
792 DEBUG(0, ("regdb_store_keys: Could not commit transaction\n"));
793 goto fail;
794 }
795
796 TALLOC_FREE(ctx);
797 return true;
798
799 cancel:
800 if (regdb->transaction_cancel(regdb) != 0) {
801 smb_panic("regdb_store_keys: transaction_cancel failed\n");
802 }
803
804 fail:
805 TALLOC_FREE(ctx);
806
807 return false;
808 }
809
810
811 static TDB_DATA regdb_fetch_key_internal(TALLOC_CTX *mem_ctx, const char *key)
812 {
813 char *path = NULL;
814 TDB_DATA data;
815
816 path = normalize_reg_path(mem_ctx, key);
817 if (!path) {
818 return make_tdb_data(NULL, 0);
819 }
820
821 data = dbwrap_fetch_bystring(regdb, mem_ctx, path);
822
823 TALLOC_FREE(path);
824 return data;
825 }
826
827
828 /**
829 * check whether a given key name represents a base key,
830 * i.e one without a subkey separator ('/' or '\').
831 */
832 static bool regdb_key_is_base_key(const char *key)
833 {
834 TALLOC_CTX *mem_ctx = talloc_stackframe();
835 bool ret = false;
836 char *path;
837
838 if (key == NULL) {
839 goto done;
840 }
841
842 path = normalize_reg_path(mem_ctx, key);
843 if (path == NULL) {
844 DEBUG(0, ("out of memory! (talloc failed)\n"));
845 goto done;
846 }
847
848 if (*path == '\0') {
849 goto done;
850 }
851
852 ret = (strrchr(path, '/') == NULL);
853
854 done:
855 TALLOC_FREE(mem_ctx);
856 return ret;
857 }
858
859
860 /**
861 * Check for the existence of a key.
862 *
863 * Existence of a key is authoritatively defined by its
864 * existence in the list of subkeys of its parent key.
865 * The exeption of this are keys without a parent key,
866 * i.e. the "base" keys (HKLM, HKCU, ...).
867 */
868 static bool regdb_key_exists(const char *key)
869 {
870 TALLOC_CTX *mem_ctx = talloc_stackframe();
871 TDB_DATA value;
872 bool ret = false;
873 char *path, *p;
874
875 if (key == NULL) {
876 goto done;
877 }
878
879 path = normalize_reg_path(mem_ctx, key);
880 if (path == NULL) {
881 DEBUG(0, ("out of memory! (talloc failed)\n"));
882 goto done;
883 }
884
885 if (*path == '\0') {
886 goto done;
887 }
888
889 p = strrchr(path, '/');
890 if (p == NULL) {
891 /* this is a base key */
892 value = regdb_fetch_key_internal(mem_ctx, path);
893 ret = (value.dptr != NULL);
894 } else {
895 /* get the list of subkeys of the parent key */
896 uint32 num_items, len, i;
897 fstring subkeyname;
898
899 *p = '\0';
900 p++;
901 value = regdb_fetch_key_internal(mem_ctx, path);
902 if (value.dptr == NULL) {
903 goto done;
904 }
905
906 len = tdb_unpack(value.dptr, value.dsize, "d", &num_items);
907 for (i = 0; i < num_items; i++) {
908 len += tdb_unpack(value.dptr +len, value.dsize -len,
909 "f", &subkeyname);
910 if (strequal(subkeyname, p)) {
911 ret = true;
912 goto done;
913 }
914 }
915 }
916
917 done:
918 TALLOC_FREE(mem_ctx);
919 return ret;
920 }
921
922
923 /***********************************************************************
924 Retrieve an array of strings containing subkeys. Memory should be
925 released by the caller.
926 ***********************************************************************/
927
928 int regdb_fetch_keys(const char *key, REGSUBKEY_CTR *ctr)
929 {
930 WERROR werr;
931 uint32 num_items;
932 uint8 *buf;
933 uint32 buflen, len;
934 int i;
935 fstring subkeyname;
936 int ret = -1;
937 TALLOC_CTX *frame = talloc_stackframe();
938 TDB_DATA value;
939
940 DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
941
942 if (!regdb_key_exists(key)) {
943 goto done;
944 }
945
946 ctr->seqnum = regdb_get_seqnum();
947
948 value = regdb_fetch_key_internal(frame, key);
949
950 if (value.dptr == NULL) {
951 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
952 key));
953 ret = 0;
954 goto done;
955 }
956
957 buf = value.dptr;
958 buflen = value.dsize;
959 len = tdb_unpack( buf, buflen, "d", &num_items);
960
961 for (i=0; i<num_items; i++) {
962 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
963 werr = regsubkey_ctr_addkey(ctr, subkeyname);
964 if (!W_ERROR_IS_OK(werr)) {
965 DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
966 "failed: %s\n", dos_errstr(werr)));
967 goto done;
968 }
969 }
970
971 DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
972
973 ret = num_items;
974 done:
975 TALLOC_FREE(frame);
976 return ret;
977 }
978
979 /****************************************************************************
980 Unpack a list of registry values frem the TDB
981 ***************************************************************************/
982
983 static int regdb_unpack_values(REGVAL_CTR *values, uint8 *buf, int buflen)
984 {
985 int len = 0;
986 uint32 type;
987 fstring valuename;
988 uint32 size;
989 uint8 *data_p;
990 uint32 num_values = 0;
991 int i;
992
993 /* loop and unpack the rest of the registry values */
994
995 len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
996
997 for ( i=0; i<num_values; i++ ) {
998 /* unpack the next regval */
999
1000 type = REG_NONE;
1001 size = 0;
1002 data_p = NULL;
1003 valuename[0] = '\0';
1004 len += tdb_unpack(buf+len, buflen-len, "fdB",
1005 valuename,
1006 &type,
1007 &size,
1008 &data_p);
1009
1010 /* add the new value. Paranoid protective code -- make sure data_p is valid */
1011
1012 if (*valuename && size && data_p) {
1013 regval_ctr_addvalue(values, valuename, type,
1014 (const char *)data_p, size);
1015 }
1016 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1017
1018 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
1019 }
1020
1021 return len;
1022 }
1023
1024 /****************************************************************************
1025 Pack all values in all printer keys
1026 ***************************************************************************/
1027
1028 static int regdb_pack_values(REGVAL_CTR *values, uint8 *buf, int buflen)
1029 {
1030 int len = 0;
1031 int i;
1032 REGISTRY_VALUE *val;
1033 int num_values;
1034
1035 if ( !values )
1036 return 0;
1037
1038 num_values = regval_ctr_numvals( values );
1039
1040 /* pack the number of values first */
1041
1042 len += tdb_pack( buf+len, buflen-len, "d", num_values );
1043
1044 /* loop over all values */
1045
1046 for ( i=0; i<num_values; i++ ) {
1047 val = regval_ctr_specific_value( values, i );
1048 len += tdb_pack(buf+len, buflen-len, "fdB",
1049 regval_name(val),
1050 regval_type(val),
1051 regval_size(val),
1052 regval_data_p(val) );
1053 }
1054
1055 return len;
1056 }
1057
1058 /***********************************************************************
1059 Retrieve an array of strings containing subkeys. Memory should be
1060 released by the caller.
1061 ***********************************************************************/
1062
1063 int regdb_fetch_values( const char* key, REGVAL_CTR *values )
1064 {
1065 char *keystr = NULL;
1066 TALLOC_CTX *ctx = talloc_stackframe();
1067 int ret = 0;
1068 TDB_DATA value;
1069
1070 DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
1071
1072 if (!regdb_key_exists(key)) {
1073 goto done;
1074 }
1075
1076 keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
1077 if (!keystr) {
1078 goto done;
1079 }
1080
1081 values->seqnum = regdb_get_seqnum();
1082
1083 value = regdb_fetch_key_internal(ctx, keystr);
1084
1085 if (!value.dptr) {
1086 /* all keys have zero values by default */
1087 goto done;
1088 }
1089
1090 regdb_unpack_values(values, value.dptr, value.dsize);
1091 ret = regval_ctr_numvals(values);
1092
1093 done:
1094 TALLOC_FREE(ctx);
1095 return ret;
1096 }
1097
1098 bool regdb_store_values( const char *key, REGVAL_CTR *values )
1099 {
1100 TDB_DATA old_data, data;
1101 char *keystr = NULL;
1102 TALLOC_CTX *ctx = talloc_stackframe();
1103 int len;
1104 NTSTATUS status;
1105 bool result = false;
1106
1107 DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
1108
1109 if (!regdb_key_exists(key)) {
1110 goto done;
1111 }
1112
1113 ZERO_STRUCT(data);
1114
1115 len = regdb_pack_values(values, data.dptr, data.dsize);
1116 if (len <= 0) {
1117 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1118 goto done;
1119 }
1120
1121 data.dptr = TALLOC_ARRAY(ctx, uint8, len);
1122 data.dsize = len;
1123
1124 len = regdb_pack_values(values, data.dptr, data.dsize);
1125
1126 SMB_ASSERT( len == data.dsize );
1127
1128 keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
1129 if (!keystr) {
1130 goto done;
1131 }
1132 keystr = normalize_reg_path(ctx, keystr);
1133 if (!keystr) {
1134 goto done;
1135 }
1136
1137 old_data = dbwrap_fetch_bystring(regdb, ctx, keystr);
1138
1139 if ((old_data.dptr != NULL)
1140 && (old_data.dsize == data.dsize)
1141 && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1142 {
1143 result = true;
1144 goto done;
1145 }
1146
1147 status = dbwrap_trans_store_bystring(regdb, keystr, data, TDB_REPLACE);
1148
1149 result = NT_STATUS_IS_OK(status);
1150
1151 done:
1152 TALLOC_FREE(ctx);
1153 return result;
1154 }
1155
1156 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1157 struct security_descriptor **psecdesc)
1158 {
1159 char *tdbkey;
1160 TDB_DATA data;
1161 NTSTATUS status;
1162 TALLOC_CTX *tmp_ctx = talloc_stackframe();
1163 WERROR err = WERR_OK;
1164
1165 DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1166
1167 if (!regdb_key_exists(key)) {
1168 err = WERR_BADFILE;
1169 goto done;
1170 }
1171
1172 tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1173 if (tdbkey == NULL) {
1174 err = WERR_NOMEM;
1175 goto done;
1176 }
1177 normalize_dbkey(tdbkey);
1178
1179 data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
1180 if (data.dptr == NULL) {
1181 err = WERR_BADFILE;
1182 goto done;
1183 }
1184
1185 status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1186 psecdesc);
1187
1188 if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1189 err = WERR_NOMEM;
1190 } else if (!NT_STATUS_IS_OK(status)) {
1191 err = WERR_REG_CORRUPT;
1192 }
1193
1194 done:
1195 TALLOC_FREE(tmp_ctx);
1196 return err;
1197 }
1198
1199 static WERROR regdb_set_secdesc(const char *key,
1200 struct security_descriptor *secdesc)
1201 {
1202 TALLOC_CTX *mem_ctx = talloc_stackframe();
1203 char *tdbkey;
1204 NTSTATUS status;
1205 WERROR err = WERR_NOMEM;
1206 TDB_DATA tdbdata;
1207
1208 if (!regdb_key_exists(key)) {
1209 err = WERR_BADFILE;
1210 goto done;
1211 }
1212
1213 tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1214 if (tdbkey == NULL) {
1215 goto done;
1216 }
1217 normalize_dbkey(tdbkey);
1218
1219 if (secdesc == NULL) {
1220 /* assuming a delete */
1221 status = dbwrap_trans_delete_bystring(regdb, tdbkey);
1222 if (NT_STATUS_IS_OK(status)) {
1223 err = WERR_OK;
1224 } else {
1225 err = ntstatus_to_werror(status);
1226 }
1227 goto done;
1228 }
1229
1230 err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1231 &tdbdata.dptr,
1232 &tdbdata.dsize));
1233 if (!W_ERROR_IS_OK(err)) {
1234 goto done;
1235 }
1236
1237 status = dbwrap_trans_store_bystring(regdb, tdbkey, tdbdata, 0);
1238 if (!NT_STATUS_IS_OK(status)) {
1239 err = ntstatus_to_werror(status);
1240 goto done;
1241 }
1242
1243 done:
1244 TALLOC_FREE(mem_ctx);
1245 return err;
1246 }
1247
1248 bool regdb_subkeys_need_update(REGSUBKEY_CTR *subkeys)
1249 {
1250 return (regdb_get_seqnum() != subkeys->seqnum);
1251 }
1252
1253 bool regdb_values_need_update(REGVAL_CTR *values)
1254 {
1255 return (regdb_get_seqnum() != values->seqnum);
1256 }
1257
1258 /*
1259 * Table of function pointers for default access
1260 */
1261
1262 REGISTRY_OPS regdb_ops = {
1263 .fetch_subkeys = regdb_fetch_keys,
1264 .fetch_values = regdb_fetch_values,
1265 .store_subkeys = regdb_store_keys,
1266 .store_values = regdb_store_values,
1267 .get_secdesc = regdb_get_secdesc,
1268 .set_secdesc = regdb_set_secdesc,
1269 .subkeys_need_update = regdb_subkeys_need_update,
1270 .values_need_update = regdb_values_need_update
1271 };
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