source: trunk/server/source3/registry/reg_backend_db.c

Last change on this file was 751, checked in by Silvan Scherrer, 13 years ago

Samba Server: updated trunk to 3.6.9
File size: 49.5 KB
Line 
1/*
2 * Unix SMB/CIFS implementation.
3 * Virtual Windows Registry Layer
4 * Copyright (C) Gerald Carter 2002-2005
5 * Copyright (C) Michael Adam 2007-2009
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 */
20
21/* Implementation of internal registry database functions. */
22
23#include "includes.h"
24#include "system/filesys.h"
25#include "registry.h"
26#include "reg_db.h"
27#include "reg_util_internal.h"
28#include "reg_backend_db.h"
29#include "reg_objects.h"
30#include "nt_printing.h"
31#include "util_tdb.h"
32#include "dbwrap.h"
33
34#undef DBGC_CLASS
35#define DBGC_CLASS DBGC_REGISTRY
36
37static struct db_context *regdb = NULL;
38static int regdb_refcount;
39
40static bool regdb_key_exists(struct db_context *db, const char *key);
41static bool regdb_key_is_base_key(const char *key);
42static WERROR regdb_fetch_keys_internal(struct db_context *db, const char *key,
43 struct regsubkey_ctr *ctr);
44static bool regdb_store_keys_internal(struct db_context *db, const char *key,
45 struct regsubkey_ctr *ctr);
46static int regdb_fetch_values_internal(struct db_context *db, const char* key,
47 struct regval_ctr *values);
48static bool regdb_store_values_internal(struct db_context *db, const char *key,
49 struct regval_ctr *values);
50
51static NTSTATUS create_sorted_subkeys(const char *key);
52
53/* List the deepest path into the registry. All part components will be created.*/
54
55/* If you want to have a part of the path controlled by the tdb and part by
56 a virtual registry db (e.g. printing), then you have to list the deepest path.
57 For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print"
58 allows the reg_db backend to handle everything up to
59 "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook
60 the reg_printing backend onto the last component of the path (see
61 KEY_PRINTING_2K in include/rpc_reg.h) --jerry */
62
63static const char *builtin_registry_paths[] = {
64 KEY_PRINTING_2K,
65 KEY_PRINTING_PORTS,
66 KEY_PRINTING,
67 KEY_PRINTING "\\Forms",
68 KEY_PRINTING "\\Printers",
69 KEY_PRINTING "\\Environments\\Windows NT x86\\Print Processors\\winprint",
70 KEY_SHARES,
71 KEY_EVENTLOG,
72 KEY_SMBCONF,
73 KEY_PERFLIB,
74 KEY_PERFLIB_009,
75 KEY_GROUP_POLICY,
76 KEY_SAMBA_GROUP_POLICY,
77 KEY_GP_MACHINE_POLICY,
78 KEY_GP_MACHINE_WIN_POLICY,
79 KEY_HKCU,
80 KEY_GP_USER_POLICY,
81 KEY_GP_USER_WIN_POLICY,
82 "HKLM\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\GPExtensions",
83 "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
84 KEY_PROD_OPTIONS,
85 "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
86 KEY_TCPIP_PARAMS,
87 KEY_NETLOGON_PARAMS,
88 KEY_HKU,
89 KEY_HKCR,
90 KEY_HKPD,
91 KEY_HKPT,
92 NULL };
93
94struct builtin_regkey_value {
95 const char *path;
96 const char *valuename;
97 uint32 type;
98 union {
99 const char *string;
100 uint32 dw_value;
101 } data;
102};
103
104static struct builtin_regkey_value builtin_registry_values[] = {
105 { KEY_PRINTING_PORTS,
106 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
107 { KEY_PRINTING_2K,
108 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
109 { KEY_EVENTLOG,
110 "DisplayName", REG_SZ, { "Event Log" } },
111 { KEY_EVENTLOG,
112 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
113 { NULL, NULL, 0, { NULL } }
114};
115
116/**
117 * Initialize a key in the registry:
118 * create each component key of the specified path.
119 */
120static WERROR init_registry_key_internal(struct db_context *db,
121 const char *add_path)
122{
123 WERROR werr;
124 TALLOC_CTX *frame = talloc_stackframe();
125 char *path = NULL;
126 char *base = NULL;
127 char *remaining = NULL;
128 char *keyname;
129 char *subkeyname;
130 struct regsubkey_ctr *subkeys;
131 const char *p, *p2;
132
133 DEBUG(6, ("init_registry_key: Adding [%s]\n", add_path));
134
135 path = talloc_strdup(frame, add_path);
136 base = talloc_strdup(frame, "");
137 if (!path || !base) {
138 werr = WERR_NOMEM;
139 goto fail;
140 }
141 p = path;
142
143 while (next_token_talloc(frame, &p, &keyname, "\\")) {
144
145 /* build up the registry path from the components */
146
147 if (*base) {
148 base = talloc_asprintf(frame, "%s\\", base);
149 if (!base) {
150 werr = WERR_NOMEM;
151 goto fail;
152 }
153 }
154 base = talloc_asprintf_append(base, "%s", keyname);
155 if (!base) {
156 werr = WERR_NOMEM;
157 goto fail;
158 }
159
160 /* get the immediate subkeyname (if we have one ) */
161
162 subkeyname = talloc_strdup(frame, "");
163 if (!subkeyname) {
164 werr = WERR_NOMEM;
165 goto fail;
166 }
167 if (*p) {
168 remaining = talloc_strdup(frame, p);
169 if (!remaining) {
170 werr = WERR_NOMEM;
171 goto fail;
172 }
173 p2 = remaining;
174
175 if (!next_token_talloc(frame, &p2,
176 &subkeyname, "\\"))
177 {
178 subkeyname = talloc_strdup(frame,p2);
179 if (!subkeyname) {
180 werr = WERR_NOMEM;
181 goto fail;
182 }
183 }
184 }
185
186 DEBUG(10,("init_registry_key: Storing key [%s] with "
187 "subkey [%s]\n", base,
188 *subkeyname ? subkeyname : "NULL"));
189
190 /* we don't really care if the lookup succeeds or not
191 * since we are about to update the record.
192 * We just want any subkeys already present */
193
194 werr = regsubkey_ctr_init(frame, &subkeys);
195 if (!W_ERROR_IS_OK(werr)) {
196 DEBUG(0,("talloc() failure!\n"));
197 goto fail;
198 }
199
200 werr = regdb_fetch_keys_internal(db, base, subkeys);
201 if (!W_ERROR_IS_OK(werr) &&
202 !W_ERROR_EQUAL(werr, WERR_NOT_FOUND))
203 {
204 goto fail;
205 }
206
207 if (*subkeyname) {
208 werr = regsubkey_ctr_addkey(subkeys, subkeyname);
209 if (!W_ERROR_IS_OK(werr)) {
210 goto fail;
211 }
212 }
213 if (!regdb_store_keys_internal(db, base, subkeys)) {
214 werr = WERR_CAN_NOT_COMPLETE;
215 goto fail;
216 }
217 }
218
219 werr = WERR_OK;
220
221fail:
222 TALLOC_FREE(frame);
223 return werr;
224}
225
226struct init_registry_key_context {
227 const char *add_path;
228};
229
230static NTSTATUS init_registry_key_action(struct db_context *db,
231 void *private_data)
232{
233 struct init_registry_key_context *init_ctx =
234 (struct init_registry_key_context *)private_data;
235
236 return werror_to_ntstatus(init_registry_key_internal(
237 db, init_ctx->add_path));
238}
239
240/**
241 * Initialize a key in the registry:
242 * create each component key of the specified path,
243 * wrapped in one db transaction.
244 */
245WERROR init_registry_key(const char *add_path)
246{
247 struct init_registry_key_context init_ctx;
248
249 if (regdb_key_exists(regdb, add_path)) {
250 return WERR_OK;
251 }
252
253 init_ctx.add_path = add_path;
254
255 return ntstatus_to_werror(dbwrap_trans_do(regdb,
256 init_registry_key_action,
257 &init_ctx));
258}
259
260/***********************************************************************
261 Open the registry data in the tdb
262 ***********************************************************************/
263
264static void regdb_ctr_add_value(struct regval_ctr *ctr,
265 struct builtin_regkey_value *value)
266{
267 switch(value->type) {
268 case REG_DWORD:
269 regval_ctr_addvalue(ctr, value->valuename, REG_DWORD,
270 (uint8_t *)&value->data.dw_value,
271 sizeof(uint32));
272 break;
273
274 case REG_SZ:
275 regval_ctr_addvalue_sz(ctr, value->valuename,
276 value->data.string);
277 break;
278
279 default:
280 DEBUG(0, ("regdb_ctr_add_value: invalid value type in "
281 "registry values [%d]\n", value->type));
282 }
283}
284
285static NTSTATUS init_registry_data_action(struct db_context *db,
286 void *private_data)
287{
288 NTSTATUS status;
289 TALLOC_CTX *frame = talloc_stackframe();
290 struct regval_ctr *values;
291 int i;
292
293 /* loop over all of the predefined paths and add each component */
294
295 for (i=0; builtin_registry_paths[i] != NULL; i++) {
296 if (regdb_key_exists(db, builtin_registry_paths[i])) {
297 continue;
298 }
299 status = werror_to_ntstatus(init_registry_key_internal(db,
300 builtin_registry_paths[i]));
301 if (!NT_STATUS_IS_OK(status)) {
302 goto done;
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 WERROR werr;
310
311 werr = regval_ctr_init(frame, &values);
312 if (!W_ERROR_IS_OK(werr)) {
313 status = werror_to_ntstatus(werr);
314 goto done;
315 }
316
317 regdb_fetch_values_internal(db,
318 builtin_registry_values[i].path,
319 values);
320
321 /* preserve existing values across restarts. Only add new ones */
322
323 if (!regval_ctr_value_exists(values,
324 builtin_registry_values[i].valuename))
325 {
326 regdb_ctr_add_value(values,
327 &builtin_registry_values[i]);
328 regdb_store_values_internal(db,
329 builtin_registry_values[i].path,
330 values);
331 }
332 TALLOC_FREE(values);
333 }
334
335 status = NT_STATUS_OK;
336
337done:
338
339 TALLOC_FREE(frame);
340 return status;
341}
342
343WERROR init_registry_data(void)
344{
345 WERROR werr;
346 TALLOC_CTX *frame = talloc_stackframe();
347 struct regval_ctr *values;
348 int i;
349
350 /*
351 * First, check for the existence of the needed keys and values.
352 * If all do already exist, we can save the writes.
353 */
354 for (i=0; builtin_registry_paths[i] != NULL; i++) {
355 if (!regdb_key_exists(regdb, builtin_registry_paths[i])) {
356 goto do_init;
357 }
358 }
359
360 for (i=0; builtin_registry_values[i].path != NULL; i++) {
361 werr = regval_ctr_init(frame, &values);
362 W_ERROR_NOT_OK_GOTO_DONE(werr);
363
364 regdb_fetch_values_internal(regdb,
365 builtin_registry_values[i].path,
366 values);
367 if (!regval_ctr_value_exists(values,
368 builtin_registry_values[i].valuename))
369 {
370 TALLOC_FREE(values);
371 goto do_init;
372 }
373
374 TALLOC_FREE(values);
375 }
376
377 werr = WERR_OK;
378 goto done;
379
380do_init:
381
382 /*
383 * There are potentially quite a few store operations which are all
384 * indiviually wrapped in tdb transactions. Wrapping them in a single
385 * transaction gives just a single transaction_commit() to actually do
386 * its fsync()s. See tdb/common/transaction.c for info about nested
387 * transaction behaviour.
388 */
389
390 werr = ntstatus_to_werror(dbwrap_trans_do(regdb,
391 init_registry_data_action,
392 NULL));
393
394done:
395 TALLOC_FREE(frame);
396 return werr;
397}
398
399static int regdb_normalize_keynames_fn(struct db_record *rec,
400 void *private_data)
401{
402 TALLOC_CTX *mem_ctx = talloc_tos();
403 const char *keyname;
404 NTSTATUS status;
405
406 if (rec->key.dptr == NULL || rec->key.dsize == 0) {
407 return 0;
408 }
409
410 keyname = strchr((const char *) rec->key.dptr, '/');
411 if (keyname) {
412 struct db_record new_rec;
413
414 keyname = talloc_string_sub(mem_ctx,
415 (const char *) rec->key.dptr,
416 "/",
417 "\\");
418
419 DEBUG(2, ("regdb_normalize_keynames_fn: Convert %s to %s\n",
420 (const char *) rec->key.dptr,
421 keyname));
422
423 new_rec.value = rec->value;
424 new_rec.key = string_term_tdb_data(keyname);
425 new_rec.private_data = rec->private_data;
426
427 /* Delete the original record and store the normalized key */
428 status = rec->delete_rec(rec);
429 if (!NT_STATUS_IS_OK(status)) {
430 DEBUG(0,("regdb_normalize_keynames_fn: "
431 "tdb_delete for [%s] failed!\n",
432 rec->key.dptr));
433 return 1;
434 }
435
436 status = rec->store(&new_rec, new_rec.value, TDB_REPLACE);
437 if (!NT_STATUS_IS_OK(status)) {
438 DEBUG(0,("regdb_normalize_keynames_fn: "
439 "failed to store new record for [%s]!\n",
440 keyname));
441 return 1;
442 }
443 }
444
445 return 0;
446}
447
448static WERROR regdb_store_regdb_version(uint32_t version)
449{
450 NTSTATUS status;
451 const char *version_keyname = "INFO/version";
452
453 if (!regdb) {
454 return WERR_CAN_NOT_COMPLETE;
455 }
456
457 status = dbwrap_trans_store_int32(regdb, version_keyname, version);
458 if (!NT_STATUS_IS_OK(status)) {
459 DEBUG(1, ("regdb_store_regdb_version: error storing %s = %d: %s\n",
460 version_keyname, version, nt_errstr(status)));
461 return ntstatus_to_werror(status);
462 } else {
463 DEBUG(10, ("regdb_store_regdb_version: stored %s = %d\n",
464 version_keyname, version));
465 return WERR_OK;
466 }
467}
468
469static WERROR regdb_upgrade_v1_to_v2(void)
470{
471 TALLOC_CTX *mem_ctx;
472 int rc;
473 WERROR werr;
474
475 mem_ctx = talloc_stackframe();
476 if (mem_ctx == NULL) {
477 return WERR_NOMEM;
478 }
479
480 rc = regdb->traverse(regdb, regdb_normalize_keynames_fn, mem_ctx);
481
482 talloc_destroy(mem_ctx);
483
484 if (rc == -1) {
485 return WERR_REG_IO_FAILURE;
486 }
487
488 werr = regdb_store_regdb_version(REGVER_V2);
489 return werr;
490}
491
492/***********************************************************************
493 Open the registry database
494 ***********************************************************************/
495
496WERROR regdb_init(void)
497{
498 const char *vstring = "INFO/version";
499 uint32 vers_id, expected_version;
500 WERROR werr;
501
502 if (regdb) {
503 DEBUG(10, ("regdb_init: incrementing refcount (%d->%d)\n",
504 regdb_refcount, regdb_refcount+1));
505 regdb_refcount++;
506 return WERR_OK;
507 }
508
509 regdb = db_open(NULL, state_path("registry.tdb"), 0,
510 REG_TDB_FLAGS, O_RDWR, 0600);
511 if (!regdb) {
512 regdb = db_open(NULL, state_path("registry.tdb"), 0,
513 REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
514 if (!regdb) {
515 werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
516 DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n",
517 state_path("registry.tdb"), strerror(errno) ));
518 return werr;
519 }
520
521 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
522 }
523
524 regdb_refcount = 1;
525 DEBUG(10, ("regdb_init: registry db openend. refcount reset (%d)\n",
526 regdb_refcount));
527
528 expected_version = REGVER_V2;
529
530 vers_id = dbwrap_fetch_int32(regdb, vstring);
531 if (vers_id == -1) {
532 DEBUG(10, ("regdb_init: registry version uninitialized "
533 "(got %d), initializing to version %d\n",
534 vers_id, expected_version));
535
536 werr = regdb_store_regdb_version(expected_version);
537 return werr;
538 }
539
540 if (vers_id > expected_version || vers_id == 0) {
541 DEBUG(1, ("regdb_init: unknown registry version %d "
542 "(code version = %d), refusing initialization\n",
543 vers_id, expected_version));
544 return WERR_CAN_NOT_COMPLETE;
545 }
546
547 if (vers_id == REGVER_V1) {
548 DEBUG(10, ("regdb_init: got registry db version %d, upgrading "
549 "to version %d\n", REGVER_V1, REGVER_V2));
550
551 if (regdb->transaction_start(regdb) != 0) {
552 return WERR_REG_IO_FAILURE;
553 }
554
555 werr = regdb_upgrade_v1_to_v2();
556 if (!W_ERROR_IS_OK(werr)) {
557 regdb->transaction_cancel(regdb);
558 return werr;
559 }
560
561 if (regdb->transaction_commit(regdb) != 0) {
562 return WERR_REG_IO_FAILURE;
563 }
564
565 vers_id = REGVER_V2;
566 }
567
568 /* future upgrade code should go here */
569
570 return WERR_OK;
571}
572
573/***********************************************************************
574 Open the registry. Must already have been initialized by regdb_init()
575 ***********************************************************************/
576
577WERROR regdb_open( void )
578{
579 WERROR result = WERR_OK;
580
581 if ( regdb ) {
582 DEBUG(10, ("regdb_open: incrementing refcount (%d->%d)\n",
583 regdb_refcount, regdb_refcount+1));
584 regdb_refcount++;
585 return WERR_OK;
586 }
587
588 become_root();
589
590 regdb = db_open(NULL, state_path("registry.tdb"), 0,
591 REG_TDB_FLAGS, O_RDWR, 0600);
592 if ( !regdb ) {
593 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
594 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
595 state_path("registry.tdb"), strerror(errno) ));
596 }
597
598 unbecome_root();
599
600 regdb_refcount = 1;
601 DEBUG(10, ("regdb_open: registry db opened. refcount reset (%d)\n",
602 regdb_refcount));
603
604 return result;
605}
606
607/***********************************************************************
608 ***********************************************************************/
609
610int regdb_close( void )
611{
612 if (regdb_refcount == 0) {
613 return 0;
614 }
615
616 regdb_refcount--;
617
618 DEBUG(10, ("regdb_close: decrementing refcount (%d->%d)\n",
619 regdb_refcount+1, regdb_refcount));
620
621 if ( regdb_refcount > 0 )
622 return 0;
623
624 SMB_ASSERT( regdb_refcount >= 0 );
625
626 TALLOC_FREE(regdb);
627 return 0;
628}
629
630WERROR regdb_transaction_start(void)
631{
632 return (regdb->transaction_start(regdb) == 0) ?
633 WERR_OK : WERR_REG_IO_FAILURE;
634}
635
636WERROR regdb_transaction_commit(void)
637{
638 return (regdb->transaction_commit(regdb) == 0) ?
639 WERR_OK : WERR_REG_IO_FAILURE;
640}
641
642WERROR regdb_transaction_cancel(void)
643{
644 return (regdb->transaction_cancel(regdb) == 0) ?
645 WERR_OK : WERR_REG_IO_FAILURE;
646}
647
648/***********************************************************************
649 return the tdb sequence number of the registry tdb.
650 this is an indicator for the content of the registry
651 having changed. it will change upon regdb_init, too, though.
652 ***********************************************************************/
653int regdb_get_seqnum(void)
654{
655 return regdb->get_seqnum(regdb);
656}
657
658
659static WERROR regdb_delete_key_with_prefix(struct db_context *db,
660 const char *keyname,
661 const char *prefix)
662{
663 char *path;
664 WERROR werr = WERR_NOMEM;
665 TALLOC_CTX *mem_ctx = talloc_stackframe();
666
667 if (keyname == NULL) {
668 werr = WERR_INVALID_PARAM;
669 goto done;
670 }
671
672 if (prefix == NULL) {
673 path = discard_const_p(char, keyname);
674 } else {
675 path = talloc_asprintf(mem_ctx, "%s\\%s", prefix, keyname);
676 if (path == NULL) {
677 goto done;
678 }
679 }
680
681 path = normalize_reg_path(mem_ctx, path);
682 if (path == NULL) {
683 goto done;
684 }
685
686 werr = ntstatus_to_werror(dbwrap_delete_bystring(db, path));
687
688 /* treat "not" found" as ok */
689 if (W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) {
690 werr = WERR_OK;
691 }
692
693done:
694 talloc_free(mem_ctx);
695 return werr;
696}
697
698
699static WERROR regdb_delete_values(struct db_context *db, const char *keyname)
700{
701 return regdb_delete_key_with_prefix(db, keyname, REG_VALUE_PREFIX);
702}
703
704static WERROR regdb_delete_secdesc(struct db_context *db, const char *keyname)
705{
706 return regdb_delete_key_with_prefix(db, keyname, REG_SECDESC_PREFIX);
707}
708
709static WERROR regdb_delete_subkeylist(struct db_context *db, const char *keyname)
710{
711 return regdb_delete_key_with_prefix(db, keyname, NULL);
712}
713
714static WERROR regdb_delete_key_lists(struct db_context *db, const char *keyname)
715{
716 WERROR werr;
717
718 werr = regdb_delete_values(db, keyname);
719 if (!W_ERROR_IS_OK(werr)) {
720 DEBUG(1, (__location__ " Deleting %s\\%s failed: %s\n",
721 REG_VALUE_PREFIX, keyname, win_errstr(werr)));
722 goto done;
723 }
724
725 werr = regdb_delete_secdesc(db, keyname);
726 if (!W_ERROR_IS_OK(werr)) {
727 DEBUG(1, (__location__ " Deleting %s\\%s failed: %s\n",
728 REG_SECDESC_PREFIX, keyname, win_errstr(werr)));
729 goto done;
730 }
731
732 werr = regdb_delete_subkeylist(db, keyname);
733 if (!W_ERROR_IS_OK(werr)) {
734 DEBUG(1, (__location__ " Deleting %s failed: %s\n",
735 keyname, win_errstr(werr)));
736 goto done;
737 }
738
739done:
740 return werr;
741}
742
743/***********************************************************************
744 Add subkey strings to the registry tdb under a defined key
745 fmt is the same format as tdb_pack except this function only supports
746 fstrings
747 ***********************************************************************/
748
749static WERROR regdb_store_keys_internal2(struct db_context *db,
750 const char *key,
751 struct regsubkey_ctr *ctr)
752{
753 TDB_DATA dbuf;
754 uint8 *buffer = NULL;
755 int i = 0;
756 uint32 len, buflen;
757 uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
758 char *keyname = NULL;
759 TALLOC_CTX *ctx = talloc_stackframe();
760 WERROR werr;
761
762 if (!key) {
763 werr = WERR_INVALID_PARAM;
764 goto done;
765 }
766
767 keyname = talloc_strdup(ctx, key);
768 if (!keyname) {
769 werr = WERR_NOMEM;
770 goto done;
771 }
772
773 keyname = normalize_reg_path(ctx, keyname);
774 if (!keyname) {
775 werr = WERR_NOMEM;
776 goto done;
777 }
778
779 /* allocate some initial memory */
780
781 buffer = (uint8 *)SMB_MALLOC(1024);
782 if (buffer == NULL) {
783 werr = WERR_NOMEM;
784 goto done;
785 }
786 buflen = 1024;
787 len = 0;
788
789 /* store the number of subkeys */
790
791 len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
792
793 /* pack all the strings */
794
795 for (i=0; i<num_subkeys; i++) {
796 size_t thistime;
797
798 thistime = tdb_pack(buffer+len, buflen-len, "f",
799 regsubkey_ctr_specific_key(ctr, i));
800 if (len+thistime > buflen) {
801 size_t thistime2;
802 /*
803 * tdb_pack hasn't done anything because of the short
804 * buffer, allocate extra space.
805 */
806 buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
807 (len+thistime)*2);
808 if(buffer == NULL) {
809 DEBUG(0, ("regdb_store_keys: Failed to realloc "
810 "memory of size [%u]\n",
811 (unsigned int)(len+thistime)*2));
812 werr = WERR_NOMEM;
813 goto done;
814 }
815 buflen = (len+thistime)*2;
816 thistime2 = tdb_pack(
817 buffer+len, buflen-len, "f",
818 regsubkey_ctr_specific_key(ctr, i));
819 if (thistime2 != thistime) {
820 DEBUG(0, ("tdb_pack failed\n"));
821 werr = WERR_CAN_NOT_COMPLETE;
822 goto done;
823 }
824 }
825 len += thistime;
826 }
827
828 /* finally write out the data */
829
830 dbuf.dptr = buffer;
831 dbuf.dsize = len;
832 werr = ntstatus_to_werror(dbwrap_store_bystring(db, keyname, dbuf,
833 TDB_REPLACE));
834 W_ERROR_NOT_OK_GOTO_DONE(werr);
835
836 /*
837 * recreate the sorted subkey cache for regdb_key_exists()
838 */
839 werr = ntstatus_to_werror(create_sorted_subkeys(keyname));
840
841done:
842 TALLOC_FREE(ctx);
843 SAFE_FREE(buffer);
844 return werr;
845}
846
847/***********************************************************************
848 Store the new subkey record and create any child key records that
849 do not currently exist
850 ***********************************************************************/
851
852struct regdb_store_keys_context {
853 const char *key;
854 struct regsubkey_ctr *ctr;
855};
856
857static NTSTATUS regdb_store_keys_action(struct db_context *db,
858 void *private_data)
859{
860 struct regdb_store_keys_context *store_ctx;
861 WERROR werr;
862 int num_subkeys, i;
863 char *path = NULL;
864 struct regsubkey_ctr *subkeys = NULL, *old_subkeys = NULL;
865 char *oldkeyname = NULL;
866 TALLOC_CTX *mem_ctx = talloc_stackframe();
867
868 store_ctx = (struct regdb_store_keys_context *)private_data;
869
870 /*
871 * Re-fetch the old keys inside the transaction
872 */
873
874 werr = regsubkey_ctr_init(mem_ctx, &old_subkeys);
875 W_ERROR_NOT_OK_GOTO_DONE(werr);
876
877 werr = regdb_fetch_keys_internal(db, store_ctx->key, old_subkeys);
878 if (!W_ERROR_IS_OK(werr) &&
879 !W_ERROR_EQUAL(werr, WERR_NOT_FOUND))
880 {
881 goto done;
882 }
883
884 /*
885 * Make the store operation as safe as possible without transactions:
886 *
887 * (1) For each subkey removed from ctr compared with old_subkeys:
888 *
889 * (a) First delete the value db entry.
890 *
891 * (b) Next delete the secdesc db record.
892 *
893 * (c) Then delete the subkey list entry.
894 *
895 * (2) Now write the list of subkeys of the parent key,
896 * deleting removed entries and adding new ones.
897 *
898 * (3) Finally create the subkey list entries for the added keys.
899 *
900 * This way if we crash half-way in between deleting the subkeys
901 * and storing the parent's list of subkeys, no old data can pop up
902 * out of the blue when re-adding keys later on.
903 */
904
905 /* (1) delete removed keys' lists (values/secdesc/subkeys) */
906
907 num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
908 for (i=0; i<num_subkeys; i++) {
909 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
910
911 if (regsubkey_ctr_key_exists(store_ctx->ctr, oldkeyname)) {
912 /*
913 * It's still around, don't delete
914 */
915 continue;
916 }
917
918 path = talloc_asprintf(mem_ctx, "%s\\%s", store_ctx->key,
919 oldkeyname);
920 if (!path) {
921 werr = WERR_NOMEM;
922 goto done;
923 }
924
925 werr = regdb_delete_key_lists(db, path);
926 W_ERROR_NOT_OK_GOTO_DONE(werr);
927
928 TALLOC_FREE(path);
929 }
930
931 TALLOC_FREE(old_subkeys);
932
933 /* (2) store the subkey list for the parent */
934
935 werr = regdb_store_keys_internal2(db, store_ctx->key, store_ctx->ctr);
936 if (!W_ERROR_IS_OK(werr)) {
937 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
938 "for parent [%s]: %s\n", store_ctx->key,
939 win_errstr(werr)));
940 goto done;
941 }
942
943 /* (3) now create records for any subkeys that don't already exist */
944
945 num_subkeys = regsubkey_ctr_numkeys(store_ctx->ctr);
946
947 if (num_subkeys == 0) {
948 werr = regsubkey_ctr_init(mem_ctx, &subkeys);
949 W_ERROR_NOT_OK_GOTO_DONE(werr);
950
951 werr = regdb_store_keys_internal2(db, store_ctx->key, subkeys);
952 if (!W_ERROR_IS_OK(werr)) {
953 DEBUG(0,("regdb_store_keys: Failed to store "
954 "new record for key [%s]: %s\n",
955 store_ctx->key, win_errstr(werr)));
956 goto done;
957 }
958 TALLOC_FREE(subkeys);
959 }
960
961 for (i=0; i<num_subkeys; i++) {
962 path = talloc_asprintf(mem_ctx, "%s\\%s", store_ctx->key,
963 regsubkey_ctr_specific_key(store_ctx->ctr, i));
964 if (!path) {
965 werr = WERR_NOMEM;
966 goto done;
967 }
968 werr = regsubkey_ctr_init(mem_ctx, &subkeys);
969 W_ERROR_NOT_OK_GOTO_DONE(werr);
970
971 werr = regdb_fetch_keys_internal(db, path, subkeys);
972 if (!W_ERROR_IS_OK(werr)) {
973 /* create a record with 0 subkeys */
974 werr = regdb_store_keys_internal2(db, path, subkeys);
975 if (!W_ERROR_IS_OK(werr)) {
976 DEBUG(0,("regdb_store_keys: Failed to store "
977 "new record for key [%s]: %s\n", path,
978 win_errstr(werr)));
979 goto done;
980 }
981 }
982
983 TALLOC_FREE(subkeys);
984 TALLOC_FREE(path);
985 }
986
987 /*
988 * Update the seqnum in the container to possibly
989 * prevent next read from going to disk
990 */
991 werr = regsubkey_ctr_set_seqnum(store_ctx->ctr, db->get_seqnum(db));
992
993done:
994 talloc_free(mem_ctx);
995 return werror_to_ntstatus(werr);
996}
997
998static bool regdb_store_keys_internal(struct db_context *db, const char *key,
999 struct regsubkey_ctr *ctr)
1000{
1001 int num_subkeys, old_num_subkeys, i;
1002 struct regsubkey_ctr *old_subkeys = NULL;
1003 TALLOC_CTX *ctx = talloc_stackframe();
1004 WERROR werr;
1005 bool ret = false;
1006 struct regdb_store_keys_context store_ctx;
1007
1008 if (!regdb_key_is_base_key(key) && !regdb_key_exists(db, key)) {
1009 goto done;
1010 }
1011
1012 /*
1013 * fetch a list of the old subkeys so we can determine if anything has
1014 * changed
1015 */
1016
1017 werr = regsubkey_ctr_init(ctx, &old_subkeys);
1018 if (!W_ERROR_IS_OK(werr)) {
1019 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
1020 goto done;
1021 }
1022
1023 werr = regdb_fetch_keys_internal(db, key, old_subkeys);
1024 if (!W_ERROR_IS_OK(werr) &&
1025 !W_ERROR_EQUAL(werr, WERR_NOT_FOUND))
1026 {
1027 goto done;
1028 }
1029
1030 num_subkeys = regsubkey_ctr_numkeys(ctr);
1031 old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
1032 if ((num_subkeys && old_num_subkeys) &&
1033 (num_subkeys == old_num_subkeys)) {
1034
1035 for (i = 0; i < num_subkeys; i++) {
1036 if (strcmp(regsubkey_ctr_specific_key(ctr, i),
1037 regsubkey_ctr_specific_key(old_subkeys, i))
1038 != 0)
1039 {
1040 break;
1041 }
1042 }
1043 if (i == num_subkeys) {
1044 /*
1045 * Nothing changed, no point to even start a tdb
1046 * transaction
1047 */
1048
1049 ret = true;
1050 goto done;
1051 }
1052 }
1053
1054 TALLOC_FREE(old_subkeys);
1055
1056 store_ctx.key = key;
1057 store_ctx.ctr = ctr;
1058
1059 werr = ntstatus_to_werror(dbwrap_trans_do(db,
1060 regdb_store_keys_action,
1061 &store_ctx));
1062
1063 ret = W_ERROR_IS_OK(werr);
1064
1065done:
1066 TALLOC_FREE(ctx);
1067
1068 return ret;
1069}
1070
1071bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr)
1072{
1073 return regdb_store_keys_internal(regdb, key, ctr);
1074}
1075
1076/**
1077 * create a subkey of a given key
1078 */
1079
1080struct regdb_create_subkey_context {
1081 const char *key;
1082 const char *subkey;
1083};
1084
1085static NTSTATUS regdb_create_subkey_action(struct db_context *db,
1086 void *private_data)
1087{
1088 WERROR werr;
1089 struct regdb_create_subkey_context *create_ctx;
1090 struct regsubkey_ctr *subkeys;
1091 TALLOC_CTX *mem_ctx = talloc_stackframe();
1092
1093 create_ctx = (struct regdb_create_subkey_context *)private_data;
1094
1095 werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1096 W_ERROR_NOT_OK_GOTO_DONE(werr);
1097
1098 werr = regdb_fetch_keys_internal(db, create_ctx->key, subkeys);
1099 W_ERROR_NOT_OK_GOTO_DONE(werr);
1100
1101 werr = regsubkey_ctr_addkey(subkeys, create_ctx->subkey);
1102 W_ERROR_NOT_OK_GOTO_DONE(werr);
1103
1104 werr = regdb_store_keys_internal2(db, create_ctx->key, subkeys);
1105 if (!W_ERROR_IS_OK(werr)) {
1106 DEBUG(0, (__location__ " failed to store new subkey list for "
1107 "parent key %s: %s\n", create_ctx->key,
1108 win_errstr(werr)));
1109 }
1110
1111done:
1112 talloc_free(mem_ctx);
1113 return werror_to_ntstatus(werr);
1114}
1115
1116static WERROR regdb_create_subkey(const char *key, const char *subkey)
1117{
1118 WERROR werr;
1119 struct regsubkey_ctr *subkeys;
1120 TALLOC_CTX *mem_ctx = talloc_stackframe();
1121 struct regdb_create_subkey_context create_ctx;
1122
1123 if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
1124 werr = WERR_NOT_FOUND;
1125 goto done;
1126 }
1127
1128 werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1129 W_ERROR_NOT_OK_GOTO_DONE(werr);
1130
1131 werr = regdb_fetch_keys_internal(regdb, key, subkeys);
1132 W_ERROR_NOT_OK_GOTO_DONE(werr);
1133
1134 if (regsubkey_ctr_key_exists(subkeys, subkey)) {
1135 werr = WERR_OK;
1136 goto done;
1137 }
1138
1139 talloc_free(subkeys);
1140
1141 create_ctx.key = key;
1142 create_ctx.subkey = subkey;
1143
1144 werr = ntstatus_to_werror(dbwrap_trans_do(regdb,
1145 regdb_create_subkey_action,
1146 &create_ctx));
1147
1148done:
1149 talloc_free(mem_ctx);
1150 return werr;
1151}
1152
1153/**
1154 * create a subkey of a given key
1155 */
1156
1157struct regdb_delete_subkey_context {
1158 const char *key;
1159 const char *subkey;
1160 const char *path;
1161};
1162
1163static NTSTATUS regdb_delete_subkey_action(struct db_context *db,
1164 void *private_data)
1165{
1166 WERROR werr;
1167 struct regdb_delete_subkey_context *delete_ctx;
1168 struct regsubkey_ctr *subkeys;
1169 TALLOC_CTX *mem_ctx = talloc_stackframe();
1170
1171 delete_ctx = (struct regdb_delete_subkey_context *)private_data;
1172
1173 werr = regdb_delete_key_lists(db, delete_ctx->path);
1174 W_ERROR_NOT_OK_GOTO_DONE(werr);
1175
1176 werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1177 W_ERROR_NOT_OK_GOTO_DONE(werr);
1178
1179 werr = regdb_fetch_keys_internal(db, delete_ctx->key, subkeys);
1180 W_ERROR_NOT_OK_GOTO_DONE(werr);
1181
1182 werr = regsubkey_ctr_delkey(subkeys, delete_ctx->subkey);
1183 W_ERROR_NOT_OK_GOTO_DONE(werr);
1184
1185 werr = regdb_store_keys_internal2(db, delete_ctx->key, subkeys);
1186 if (!W_ERROR_IS_OK(werr)) {
1187 DEBUG(0, (__location__ " failed to store new subkey_list for "
1188 "parent key %s: %s\n", delete_ctx->key,
1189 win_errstr(werr)));
1190 }
1191
1192done:
1193 talloc_free(mem_ctx);
1194 return werror_to_ntstatus(werr);
1195}
1196
1197static WERROR regdb_delete_subkey(const char *key, const char *subkey)
1198{
1199 WERROR werr;
1200 char *path;
1201 struct regdb_delete_subkey_context delete_ctx;
1202 TALLOC_CTX *mem_ctx = talloc_stackframe();
1203
1204 if (!regdb_key_is_base_key(key) && !regdb_key_exists(regdb, key)) {
1205 werr = WERR_NOT_FOUND;
1206 goto done;
1207 }
1208
1209 path = talloc_asprintf(mem_ctx, "%s\\%s", key, subkey);
1210 if (path == NULL) {
1211 werr = WERR_NOMEM;
1212 goto done;
1213 }
1214
1215 if (!regdb_key_exists(regdb, path)) {
1216 werr = WERR_OK;
1217 goto done;
1218 }
1219
1220 delete_ctx.key = key;
1221 delete_ctx.subkey = subkey;
1222 delete_ctx.path = path;
1223
1224 werr = ntstatus_to_werror(dbwrap_trans_do(regdb,
1225 regdb_delete_subkey_action,
1226 &delete_ctx));
1227
1228done:
1229 talloc_free(mem_ctx);
1230 return werr;
1231}
1232
1233static TDB_DATA regdb_fetch_key_internal(struct db_context *db,
1234 TALLOC_CTX *mem_ctx, const char *key)
1235{
1236 char *path = NULL;
1237 TDB_DATA data;
1238
1239 path = normalize_reg_path(mem_ctx, key);
1240 if (!path) {
1241 return make_tdb_data(NULL, 0);
1242 }
1243
1244 data = dbwrap_fetch_bystring(db, mem_ctx, path);
1245
1246 TALLOC_FREE(path);
1247 return data;
1248}
1249
1250
1251/**
1252 * check whether a given key name represents a base key,
1253 * i.e one without a subkey separator ('\').
1254 */
1255static bool regdb_key_is_base_key(const char *key)
1256{
1257 TALLOC_CTX *mem_ctx = talloc_stackframe();
1258 bool ret = false;
1259 char *path;
1260
1261 if (key == NULL) {
1262 goto done;
1263 }
1264
1265 path = normalize_reg_path(mem_ctx, key);
1266 if (path == NULL) {
1267 DEBUG(0, ("out of memory! (talloc failed)\n"));
1268 goto done;
1269 }
1270
1271 if (*path == '\0') {
1272 goto done;
1273 }
1274
1275 ret = (strrchr(path, '\\') == NULL);
1276
1277done:
1278 TALLOC_FREE(mem_ctx);
1279 return ret;
1280}
1281
1282/*
1283 * regdb_key_exists() is a very frequent operation. It can be quite
1284 * time-consuming to fully fetch the parent's subkey list, talloc_strdup all
1285 * subkeys and then compare the keyname linearly to all the parent's subkeys.
1286 *
1287 * The following code tries to make this operation as efficient as possible:
1288 * Per registry key we create a list of subkeys that is very efficient to
1289 * search for existence of a subkey. Its format is:
1290 *
1291 * 4 bytes num_subkeys
1292 * 4*num_subkey bytes offset into the string array
1293 * then follows a sorted list of subkeys in uppercase
1294 *
1295 * This record is created by create_sorted_subkeys() on demand if it does not
1296 * exist. scan_parent_subkeys() uses regdb->parse_record to search the sorted
1297 * list, the parsing code and the binary search can be found in
1298 * parent_subkey_scanner. The code uses parse_record() to avoid a memcpy of
1299 * the potentially large subkey record.
1300 *
1301 * The sorted subkey record is deleted in regdb_store_keys_internal2 and
1302 * recreated on demand.
1303 */
1304
1305static int cmp_keynames(char **p1, char **p2)
1306{
1307 return StrCaseCmp(*p1, *p2);
1308}
1309
1310struct create_sorted_subkeys_context {
1311 const char *key;
1312 const char *sorted_keyname;
1313};
1314
1315static NTSTATUS create_sorted_subkeys_action(struct db_context *db,
1316 void *private_data)
1317{
1318 char **sorted_subkeys;
1319 struct regsubkey_ctr *ctr;
1320 NTSTATUS status;
1321 char *buf;
1322 char *p;
1323 int i;
1324 size_t len;
1325 int num_subkeys;
1326 struct create_sorted_subkeys_context *sorted_ctx;
1327
1328 sorted_ctx = (struct create_sorted_subkeys_context *)private_data;
1329
1330 /*
1331 * In this function, we only treat failing of the actual write to
1332 * the db as a real error. All preliminary errors, at a stage when
1333 * nothing has been written to the DB yet are treated as success
1334 * to be committed (as an empty transaction).
1335 *
1336 * The reason is that this (disposable) call might be nested in other
1337 * transactions. Doing a cancel here would destroy the possibility of
1338 * a transaction_commit for transactions that we might be wrapped in.
1339 */
1340
1341 status = werror_to_ntstatus(regsubkey_ctr_init(talloc_tos(), &ctr));
1342 if (!NT_STATUS_IS_OK(status)) {
1343 /* don't treat this as an error */
1344 status = NT_STATUS_OK;
1345 goto done;
1346 }
1347
1348 status = werror_to_ntstatus(regdb_fetch_keys_internal(db,
1349 sorted_ctx->key,
1350 ctr));
1351 if (!NT_STATUS_IS_OK(status)) {
1352 /* don't treat this as an error */
1353 status = NT_STATUS_OK;
1354 goto done;
1355 }
1356
1357 num_subkeys = regsubkey_ctr_numkeys(ctr);
1358 sorted_subkeys = talloc_array(ctr, char *, num_subkeys);
1359 if (sorted_subkeys == NULL) {
1360 /* don't treat this as an error */
1361 goto done;
1362 }
1363
1364 len = 4 + 4*num_subkeys;
1365
1366 for (i = 0; i < num_subkeys; i++) {
1367 sorted_subkeys[i] = talloc_strdup_upper(sorted_subkeys,
1368 regsubkey_ctr_specific_key(ctr, i));
1369 if (sorted_subkeys[i] == NULL) {
1370 /* don't treat this as an error */
1371 goto done;
1372 }
1373 len += strlen(sorted_subkeys[i])+1;
1374 }
1375
1376 TYPESAFE_QSORT(sorted_subkeys, num_subkeys, cmp_keynames);
1377
1378 buf = talloc_array(ctr, char, len);
1379 if (buf == NULL) {
1380 /* don't treat this as an error */
1381 goto done;
1382 }
1383 p = buf + 4 + 4*num_subkeys;
1384
1385 SIVAL(buf, 0, num_subkeys);
1386
1387 for (i=0; i < num_subkeys; i++) {
1388 ptrdiff_t offset = p - buf;
1389 SIVAL(buf, 4 + 4*i, offset);
1390 strlcpy(p, sorted_subkeys[i], len-offset);
1391 p += strlen(sorted_subkeys[i]) + 1;
1392 }
1393
1394 status = dbwrap_store_bystring(
1395 db, sorted_ctx->sorted_keyname, make_tdb_data((uint8_t *)buf,
1396 len),
1397 TDB_REPLACE);
1398
1399done:
1400 talloc_free(ctr);
1401 return status;
1402}
1403
1404static NTSTATUS create_sorted_subkeys_internal(const char *key,
1405 const char *sorted_keyname)
1406{
1407 NTSTATUS status;
1408 struct create_sorted_subkeys_context sorted_ctx;
1409
1410 sorted_ctx.key = key;
1411 sorted_ctx.sorted_keyname = sorted_keyname;
1412
1413 status = dbwrap_trans_do(regdb,
1414 create_sorted_subkeys_action,
1415 &sorted_ctx);
1416
1417 return status;
1418}
1419
1420static NTSTATUS create_sorted_subkeys(const char *key)
1421{
1422 char *sorted_subkeys_keyname;
1423 NTSTATUS status;
1424
1425 sorted_subkeys_keyname = talloc_asprintf(talloc_tos(), "%s\\%s",
1426 REG_SORTED_SUBKEYS_PREFIX,
1427 key);
1428 if (sorted_subkeys_keyname == NULL) {
1429 status = NT_STATUS_NO_MEMORY;
1430 goto done;
1431 }
1432
1433 status = create_sorted_subkeys_internal(key, sorted_subkeys_keyname);
1434
1435done:
1436 return status;
1437}
1438
1439struct scan_subkey_state {
1440 char *name;
1441 bool scanned;
1442 bool found;
1443};
1444
1445static int parent_subkey_scanner(TDB_DATA key, TDB_DATA data,
1446 void *private_data)
1447{
1448 struct scan_subkey_state *state =
1449 (struct scan_subkey_state *)private_data;
1450 uint32_t num_subkeys;
1451 uint32_t l, u;
1452
1453 if (data.dsize < sizeof(uint32_t)) {
1454 return -1;
1455 }
1456
1457 state->scanned = true;
1458 state->found = false;
1459
1460 tdb_unpack(data.dptr, data.dsize, "d", &num_subkeys);
1461
1462 l = 0;
1463 u = num_subkeys;
1464
1465 while (l < u) {
1466 uint32_t idx = (l+u)/2;
1467 char *s = (char *)data.dptr + IVAL(data.dptr, 4 + 4*idx);
1468 int comparison = strcmp(state->name, s);
1469
1470 if (comparison < 0) {
1471 u = idx;
1472 } else if (comparison > 0) {
1473 l = idx + 1;
1474 } else {
1475 state->found = true;
1476 return 0;
1477 }
1478 }
1479 return 0;
1480}
1481
1482static bool scan_parent_subkeys(struct db_context *db, const char *parent,
1483 const char *name)
1484{
1485 char *path = NULL;
1486 char *key = NULL;
1487 struct scan_subkey_state state = { 0, };
1488 bool result = false;
1489 int res;
1490
1491 state.name = NULL;
1492
1493 path = normalize_reg_path(talloc_tos(), parent);
1494 if (path == NULL) {
1495 goto fail;
1496 }
1497
1498 key = talloc_asprintf(talloc_tos(), "%s\\%s",
1499 REG_SORTED_SUBKEYS_PREFIX, path);
1500 if (key == NULL) {
1501 goto fail;
1502 }
1503
1504 state.name = talloc_strdup_upper(talloc_tos(), name);
1505 if (state.name == NULL) {
1506 goto fail;
1507 }
1508 state.scanned = false;
1509
1510 res = db->parse_record(db, string_term_tdb_data(key),
1511 parent_subkey_scanner, &state);
1512
1513 if (state.scanned) {
1514 result = state.found;
1515 } else {
1516 NTSTATUS status;
1517
1518 res = db->transaction_start(db);
1519 if (res != 0) {
1520 DEBUG(0, ("error starting transaction\n"));
1521 goto fail;
1522 }
1523
1524 DEBUG(2, (__location__ " WARNING: recreating the sorted "
1525 "subkeys cache for key '%s' from scan_parent_subkeys "
1526 "this should not happen (too frequently)...\n",
1527 path));
1528
1529 status = create_sorted_subkeys_internal(path, key);
1530 if (!NT_STATUS_IS_OK(status)) {
1531 res = db->transaction_cancel(db);
1532 if (res != 0) {
1533 smb_panic("Failed to cancel transaction.");
1534 }
1535 goto fail;
1536 }
1537
1538 res = db->parse_record(db, string_term_tdb_data(key),
1539 parent_subkey_scanner, &state);
1540 if ((res == 0) && (state.scanned)) {
1541 result = state.found;
1542 }
1543
1544 res = db->transaction_commit(db);
1545 if (res != 0) {
1546 DEBUG(0, ("error committing transaction\n"));
1547 result = false;
1548 }
1549 }
1550
1551 fail:
1552 TALLOC_FREE(path);
1553 TALLOC_FREE(state.name);
1554 return result;
1555}
1556
1557/**
1558 * Check for the existence of a key.
1559 *
1560 * Existence of a key is authoritatively defined by its
1561 * existence in the list of subkeys of its parent key.
1562 * The exeption of this are keys without a parent key,
1563 * i.e. the "base" keys (HKLM, HKCU, ...).
1564 */
1565static bool regdb_key_exists(struct db_context *db, const char *key)
1566{
1567 TALLOC_CTX *mem_ctx = talloc_stackframe();
1568 TDB_DATA value;
1569 bool ret = false;
1570 char *path, *p;
1571
1572 if (key == NULL) {
1573 goto done;
1574 }
1575
1576 path = normalize_reg_path(mem_ctx, key);
1577 if (path == NULL) {
1578 DEBUG(0, ("out of memory! (talloc failed)\n"));
1579 goto done;
1580 }
1581
1582 if (*path == '\0') {
1583 goto done;
1584 }
1585
1586 p = strrchr(path, '\\');
1587 if (p == NULL) {
1588 /* this is a base key */
1589 value = regdb_fetch_key_internal(db, mem_ctx, path);
1590 ret = (value.dptr != NULL);
1591 } else {
1592 *p = '\0';
1593 ret = scan_parent_subkeys(db, path, p+1);
1594 }
1595
1596done:
1597 TALLOC_FREE(mem_ctx);
1598 return ret;
1599}
1600
1601
1602/***********************************************************************
1603 Retrieve an array of strings containing subkeys. Memory should be
1604 released by the caller.
1605 ***********************************************************************/
1606
1607static WERROR regdb_fetch_keys_internal(struct db_context *db, const char *key,
1608 struct regsubkey_ctr *ctr)
1609{
1610 WERROR werr;
1611 uint32_t num_items;
1612 uint8 *buf;
1613 uint32 buflen, len;
1614 int i;
1615 fstring subkeyname;
1616 TALLOC_CTX *frame = talloc_stackframe();
1617 TDB_DATA value;
1618 int seqnum[2], count;
1619
1620 DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
1621
1622 if (!regdb_key_exists(db, key)) {
1623 DEBUG(10, ("key [%s] not found\n", key));
1624 werr = WERR_NOT_FOUND;
1625 goto done;
1626 }
1627
1628 werr = regsubkey_ctr_reinit(ctr);
1629 W_ERROR_NOT_OK_GOTO_DONE(werr);
1630
1631 count = 0;
1632 ZERO_STRUCT(value);
1633 seqnum[0] = db->get_seqnum(db);
1634
1635 do {
1636 count++;
1637 TALLOC_FREE(value.dptr);
1638 value = regdb_fetch_key_internal(db, frame, key);
1639 seqnum[count % 2] = db->get_seqnum(db);
1640
1641 } while (seqnum[0] != seqnum[1]);
1642
1643 if (count > 1) {
1644 DEBUG(5, ("regdb_fetch_keys_internal: it took %d attempts to "
1645 "fetch key '%s' with constant seqnum\n",
1646 count, key));
1647 }
1648
1649 werr = regsubkey_ctr_set_seqnum(ctr, seqnum[0]);
1650 if (!W_ERROR_IS_OK(werr)) {
1651 goto done;
1652 }
1653
1654 if (value.dsize == 0 || value.dptr == NULL) {
1655 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
1656 key));
1657 goto done;
1658 }
1659
1660 buf = value.dptr;
1661 buflen = value.dsize;
1662 len = tdb_unpack( buf, buflen, "d", &num_items);
1663 if (len == (uint32_t)-1) {
1664 werr = WERR_NOT_FOUND;
1665 goto done;
1666 }
1667
1668 for (i=0; i<num_items; i++) {
1669 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
1670 werr = regsubkey_ctr_addkey(ctr, subkeyname);
1671 if (!W_ERROR_IS_OK(werr)) {
1672 DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
1673 "failed: %s\n", win_errstr(werr)));
1674 num_items = 0;
1675 goto done;
1676 }
1677 }
1678
1679 DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
1680
1681done:
1682 TALLOC_FREE(frame);
1683 return werr;
1684}
1685
1686int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
1687{
1688 WERROR werr;
1689
1690 werr = regdb_fetch_keys_internal(regdb, key, ctr);
1691 if (!W_ERROR_IS_OK(werr)) {
1692 return -1;
1693 }
1694
1695 return regsubkey_ctr_numkeys(ctr);
1696}
1697
1698/****************************************************************************
1699 Unpack a list of registry values frem the TDB
1700 ***************************************************************************/
1701
1702static int regdb_unpack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1703{
1704 int len = 0;
1705 uint32 type;
1706 fstring valuename;
1707 uint32 size;
1708 uint8 *data_p;
1709 uint32 num_values = 0;
1710 int i;
1711
1712 /* loop and unpack the rest of the registry values */
1713
1714 len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
1715
1716 for ( i=0; i<num_values; i++ ) {
1717 /* unpack the next regval */
1718
1719 type = REG_NONE;
1720 size = 0;
1721 data_p = NULL;
1722 valuename[0] = '\0';
1723 len += tdb_unpack(buf+len, buflen-len, "fdB",
1724 valuename,
1725 &type,
1726 &size,
1727 &data_p);
1728
1729 regval_ctr_addvalue(values, valuename, type,
1730 (uint8_t *)data_p, size);
1731 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1732
1733 DEBUG(10, ("regdb_unpack_values: value[%d]: name[%s] len[%d]\n",
1734 i, valuename, size));
1735 }
1736
1737 return len;
1738}
1739
1740/****************************************************************************
1741 Pack all values in all printer keys
1742 ***************************************************************************/
1743
1744static int regdb_pack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1745{
1746 int len = 0;
1747 int i;
1748 struct regval_blob *val;
1749 int num_values;
1750
1751 if ( !values )
1752 return 0;
1753
1754 num_values = regval_ctr_numvals( values );
1755
1756 /* pack the number of values first */
1757
1758 len += tdb_pack( buf+len, buflen-len, "d", num_values );
1759
1760 /* loop over all values */
1761
1762 for ( i=0; i<num_values; i++ ) {
1763 val = regval_ctr_specific_value( values, i );
1764 len += tdb_pack(buf+len, buflen-len, "fdB",
1765 regval_name(val),
1766 regval_type(val),
1767 regval_size(val),
1768 regval_data_p(val) );
1769 }
1770
1771 return len;
1772}
1773
1774/***********************************************************************
1775 Retrieve an array of strings containing subkeys. Memory should be
1776 released by the caller.
1777 ***********************************************************************/
1778
1779static int regdb_fetch_values_internal(struct db_context *db, const char* key,
1780 struct regval_ctr *values)
1781{
1782 char *keystr = NULL;
1783 TALLOC_CTX *ctx = talloc_stackframe();
1784 int ret = 0;
1785 TDB_DATA value;
1786 WERROR werr;
1787 int seqnum[2], count;
1788
1789 DEBUG(10,("regdb_fetch_values: Looking for values of key [%s]\n", key));
1790
1791 if (!regdb_key_exists(db, key)) {
1792 DEBUG(10, ("regb_fetch_values: key [%s] does not exist\n",
1793 key));
1794 ret = -1;
1795 goto done;
1796 }
1797
1798 keystr = talloc_asprintf(ctx, "%s\\%s", REG_VALUE_PREFIX, key);
1799 if (!keystr) {
1800 goto done;
1801 }
1802
1803 ZERO_STRUCT(value);
1804 count = 0;
1805 seqnum[0] = db->get_seqnum(db);
1806
1807 do {
1808 count++;
1809 TALLOC_FREE(value.dptr);
1810 value = regdb_fetch_key_internal(db, ctx, keystr);
1811 seqnum[count % 2] = db->get_seqnum(db);
1812 } while (seqnum[0] != seqnum[1]);
1813
1814 if (count > 1) {
1815 DEBUG(5, ("regdb_fetch_values_internal: it took %d attempts "
1816 "to fetch key '%s' with constant seqnum\n",
1817 count, key));
1818 }
1819
1820 werr = regval_ctr_set_seqnum(values, seqnum[0]);
1821 if (!W_ERROR_IS_OK(werr)) {
1822 goto done;
1823 }
1824
1825 if (!value.dptr) {
1826 /* all keys have zero values by default */
1827 goto done;
1828 }
1829
1830 regdb_unpack_values(values, value.dptr, value.dsize);
1831 ret = regval_ctr_numvals(values);
1832
1833done:
1834 TALLOC_FREE(ctx);
1835 return ret;
1836}
1837
1838int regdb_fetch_values(const char* key, struct regval_ctr *values)
1839{
1840 return regdb_fetch_values_internal(regdb, key, values);
1841}
1842
1843static bool regdb_store_values_internal(struct db_context *db, const char *key,
1844 struct regval_ctr *values)
1845{
1846 TDB_DATA old_data, data;
1847 char *keystr = NULL;
1848 TALLOC_CTX *ctx = talloc_stackframe();
1849 int len;
1850 NTSTATUS status;
1851 bool result = false;
1852 WERROR werr;
1853
1854 DEBUG(10,("regdb_store_values: Looking for values of key [%s]\n", key));
1855
1856 if (!regdb_key_exists(db, key)) {
1857 goto done;
1858 }
1859
1860 ZERO_STRUCT(data);
1861
1862 len = regdb_pack_values(values, data.dptr, data.dsize);
1863 if (len <= 0) {
1864 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1865 goto done;
1866 }
1867
1868 data.dptr = TALLOC_ARRAY(ctx, uint8, len);
1869 data.dsize = len;
1870
1871 len = regdb_pack_values(values, data.dptr, data.dsize);
1872
1873 SMB_ASSERT( len == data.dsize );
1874
1875 keystr = talloc_asprintf(ctx, "%s\\%s", REG_VALUE_PREFIX, key );
1876 if (!keystr) {
1877 goto done;
1878 }
1879 keystr = normalize_reg_path(ctx, keystr);
1880 if (!keystr) {
1881 goto done;
1882 }
1883
1884 old_data = dbwrap_fetch_bystring(db, ctx, keystr);
1885
1886 if ((old_data.dptr != NULL)
1887 && (old_data.dsize == data.dsize)
1888 && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1889 {
1890 result = true;
1891 goto done;
1892 }
1893
1894 status = dbwrap_trans_store_bystring(db, keystr, data, TDB_REPLACE);
1895 if (!NT_STATUS_IS_OK(status)) {
1896 DEBUG(0, ("regdb_store_values_internal: error storing: %s\n", nt_errstr(status)));
1897 goto done;
1898 }
1899
1900 /*
1901 * update the seqnum in the cache to prevent the next read
1902 * from going to disk
1903 */
1904 werr = regval_ctr_set_seqnum(values, db->get_seqnum(db));
1905 result = W_ERROR_IS_OK(status);
1906
1907done:
1908 TALLOC_FREE(ctx);
1909 return result;
1910}
1911
1912bool regdb_store_values(const char *key, struct regval_ctr *values)
1913{
1914 return regdb_store_values_internal(regdb, key, values);
1915}
1916
1917static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1918 struct security_descriptor **psecdesc)
1919{
1920 char *tdbkey;
1921 TDB_DATA data;
1922 NTSTATUS status;
1923 TALLOC_CTX *tmp_ctx = talloc_stackframe();
1924 WERROR err = WERR_OK;
1925
1926 DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1927
1928 if (!regdb_key_exists(regdb, key)) {
1929 err = WERR_BADFILE;
1930 goto done;
1931 }
1932
1933 tdbkey = talloc_asprintf(tmp_ctx, "%s\\%s", REG_SECDESC_PREFIX, key);
1934 if (tdbkey == NULL) {
1935 err = WERR_NOMEM;
1936 goto done;
1937 }
1938
1939 tdbkey = normalize_reg_path(tmp_ctx, tdbkey);
1940 if (tdbkey == NULL) {
1941 err = WERR_NOMEM;
1942 goto done;
1943 }
1944
1945 data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
1946 if (data.dptr == NULL) {
1947 err = WERR_BADFILE;
1948 goto done;
1949 }
1950
1951 status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1952 psecdesc);
1953
1954 if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1955 err = WERR_NOMEM;
1956 } else if (!NT_STATUS_IS_OK(status)) {
1957 err = WERR_REG_CORRUPT;
1958 }
1959
1960done:
1961 TALLOC_FREE(tmp_ctx);
1962 return err;
1963}
1964
1965static WERROR regdb_set_secdesc(const char *key,
1966 struct security_descriptor *secdesc)
1967{
1968 TALLOC_CTX *mem_ctx = talloc_stackframe();
1969 char *tdbkey;
1970 WERROR err = WERR_NOMEM;
1971 TDB_DATA tdbdata;
1972
1973 if (!regdb_key_exists(regdb, key)) {
1974 err = WERR_BADFILE;
1975 goto done;
1976 }
1977
1978 tdbkey = talloc_asprintf(mem_ctx, "%s\\%s", REG_SECDESC_PREFIX, key);
1979 if (tdbkey == NULL) {
1980 goto done;
1981 }
1982
1983 tdbkey = normalize_reg_path(mem_ctx, tdbkey);
1984 if (tdbkey == NULL) {
1985 err = WERR_NOMEM;
1986 goto done;
1987 }
1988
1989 if (secdesc == NULL) {
1990 /* assuming a delete */
1991 err = ntstatus_to_werror(dbwrap_trans_delete_bystring(regdb,
1992 tdbkey));
1993 goto done;
1994 }
1995
1996 err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1997 &tdbdata.dptr,
1998 &tdbdata.dsize));
1999 W_ERROR_NOT_OK_GOTO_DONE(err);
2000
2001 err = ntstatus_to_werror(dbwrap_trans_store_bystring(regdb, tdbkey,
2002 tdbdata, 0));
2003
2004 done:
2005 TALLOC_FREE(mem_ctx);
2006 return err;
2007}
2008
2009bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
2010{
2011 return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
2012}
2013
2014bool regdb_values_need_update(struct regval_ctr *values)
2015{
2016 return (regdb_get_seqnum() != regval_ctr_get_seqnum(values));
2017}
2018
2019/*
2020 * Table of function pointers for default access
2021 */
2022
2023struct registry_ops regdb_ops = {
2024 .fetch_subkeys = regdb_fetch_keys,
2025 .fetch_values = regdb_fetch_values,
2026 .store_subkeys = regdb_store_keys,
2027 .store_values = regdb_store_values,
2028 .create_subkey = regdb_create_subkey,
2029 .delete_subkey = regdb_delete_subkey,
2030 .get_secdesc = regdb_get_secdesc,
2031 .set_secdesc = regdb_set_secdesc,
2032 .subkeys_need_update = regdb_subkeys_need_update,
2033 .values_need_update = regdb_values_need_update
2034};
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