7fa6249cecd070cb524549744171966eb2e4bb84
[ira/wip.git] / source3 / registry / reg_backend_db.c
1 /* 
2  *  Unix SMB/CIFS implementation.
3  *  Virtual Windows Registry Layer
4  *  Copyright (C) Gerald Carter                     2002-2005
5  *  Copyright (C) Michael Adam                      2007-2011
6  *  Copyright (C) Gregor Beck                       2011
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 3 of the License, or
11  *  (at your option) any later version.
12  *  
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  *  
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
20  */
21
22 /* Implementation of internal registry database functions. */
23
24 #include "includes.h"
25 #include "system/filesys.h"
26 #include "registry.h"
27 #include "reg_db.h"
28 #include "reg_util_internal.h"
29 #include "reg_backend_db.h"
30 #include "reg_objects.h"
31 #include "nt_printing.h"
32 #include "util_tdb.h"
33 #include "dbwrap/dbwrap.h"
34 #include "dbwrap/dbwrap_open.h"
35 #include "../libcli/security/secdesc.h"
36
37 #undef DBGC_CLASS
38 #define DBGC_CLASS DBGC_REGISTRY
39
40 #define REGDB_VERSION_KEYNAME "INFO/version"
41
42 static struct db_context *regdb = NULL;
43 static int regdb_refcount;
44
45 static bool regdb_key_exists(struct db_context *db, const char *key);
46 static WERROR regdb_fetch_keys_internal(struct db_context *db, const char *key,
47                                         struct regsubkey_ctr *ctr);
48 static bool regdb_store_keys_internal(struct db_context *db, const char *key,
49                                       struct regsubkey_ctr *ctr);
50 static int regdb_fetch_values_internal(struct db_context *db, const char* key,
51                                        struct regval_ctr *values);
52 static NTSTATUS regdb_store_values_internal(struct db_context *db, const char *key,
53                                             struct regval_ctr *values);
54 static WERROR regdb_store_subkey_list(struct db_context *db, const char *parent,
55                                       const char *key);
56
57 static WERROR regdb_create_basekey(struct db_context *db, const char *key);
58 static WERROR regdb_create_subkey_internal(struct db_context *db,
59                                            const char *key,
60                                            const char *subkey);
61
62
63 struct regdb_trans_ctx {
64         NTSTATUS (*action)(struct db_context *, void *);
65         void *private_data;
66 };
67
68 static NTSTATUS regdb_trans_do_action(struct db_context *db, void *private_data)
69 {
70         NTSTATUS status;
71         int32_t version_id;
72         struct regdb_trans_ctx *ctx = (struct regdb_trans_ctx *)private_data;
73
74         status = dbwrap_fetch_int32(db, REGDB_VERSION_KEYNAME, &version_id);
75
76         if (!NT_STATUS_IS_OK(status)) {
77                 DEBUG(0, ("ERROR: could not fetch registry db version: %s. "
78                           "Denying access.\n", nt_errstr(status)));
79                 return NT_STATUS_ACCESS_DENIED;
80         }
81
82         if (version_id != REGDB_CODE_VERSION) {
83                 DEBUG(0, ("ERROR: changed registry version %d found while "
84                           "trying to write to the registry. Version %d "
85                           "expected.  Denying access.\n",
86                           version_id, REGDB_CODE_VERSION));
87                 return NT_STATUS_ACCESS_DENIED;
88         }
89
90         status = ctx->action(db,  ctx->private_data);
91         return status;
92 }
93
94 static WERROR regdb_trans_do(struct db_context *db,
95                              NTSTATUS (*action)(struct db_context *, void *),
96                              void *private_data)
97 {
98         NTSTATUS status;
99         struct regdb_trans_ctx ctx;
100
101
102         ctx.action = action;
103         ctx.private_data = private_data;
104
105         status = dbwrap_trans_do(db, regdb_trans_do_action, &ctx);
106
107         return ntstatus_to_werror(status);
108 }
109
110 /* List the deepest path into the registry.  All part components will be created.*/
111
112 /* If you want to have a part of the path controlled by the tdb and part by
113    a virtual registry db (e.g. printing), then you have to list the deepest path.
114    For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print" 
115    allows the reg_db backend to handle everything up to 
116    "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook 
117    the reg_printing backend onto the last component of the path (see 
118    KEY_PRINTING_2K in include/rpc_reg.h)   --jerry */
119
120 static const char *builtin_registry_paths[] = {
121         KEY_PRINTING_2K,
122         KEY_PRINTING_PORTS,
123         KEY_PRINTING,
124         KEY_PRINTING "\\Forms",
125         KEY_PRINTING "\\Printers",
126         KEY_PRINTING "\\Environments\\Windows NT x86\\Print Processors\\winprint",
127         KEY_SHARES,
128         KEY_EVENTLOG,
129         KEY_SMBCONF,
130         KEY_PERFLIB,
131         KEY_PERFLIB_009,
132         KEY_GROUP_POLICY,
133         KEY_SAMBA_GROUP_POLICY,
134         KEY_GP_MACHINE_POLICY,
135         KEY_GP_MACHINE_WIN_POLICY,
136         KEY_HKCU,
137         KEY_GP_USER_POLICY,
138         KEY_GP_USER_WIN_POLICY,
139         "HKLM\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\GPExtensions",
140         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
141         KEY_PROD_OPTIONS,
142         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
143         KEY_TCPIP_PARAMS,
144         KEY_NETLOGON_PARAMS,
145         KEY_HKU,
146         KEY_HKCR,
147         KEY_HKPD,
148         KEY_HKPT,
149          NULL };
150
151 struct builtin_regkey_value {
152         const char *path;
153         const char *valuename;
154         uint32 type;
155         union {
156                 const char *string;
157                 uint32 dw_value;
158         } data;
159 };
160
161 static struct builtin_regkey_value builtin_registry_values[] = {
162         { KEY_PRINTING_PORTS,
163                 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
164         { KEY_PRINTING_2K,
165                 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
166         { KEY_EVENTLOG,
167                 "DisplayName", REG_SZ, { "Event Log" } },
168         { KEY_EVENTLOG,
169                 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
170         { NULL, NULL, 0, { NULL } }
171 };
172
173 static WERROR create_key_recursive(struct db_context *db,
174                                    char *path,
175                                    const char *subkey)
176 {
177         WERROR werr;
178         char *p;
179
180         if (subkey == NULL) {
181                 return WERR_INVALID_PARAM;
182         }
183
184         if (path == NULL) {
185                 return regdb_create_basekey(db, subkey);
186         }
187
188         p = strrchr_m(path, '\\');
189
190         if (p == NULL) {
191                 werr = create_key_recursive(db, NULL, path);
192         } else {
193                 *p = '\0';
194                 werr = create_key_recursive(db, path, p+1);
195                 *p = '\\';
196         }
197
198         if (!W_ERROR_IS_OK(werr)) {
199                 goto done;
200         }
201
202         werr = regdb_create_subkey_internal(db, path, subkey);
203
204 done:
205         return werr;
206 }
207
208 /**
209  * Initialize a key in the registry:
210  * create each component key of the specified path.
211  */
212 static WERROR init_registry_key_internal(struct db_context *db,
213                                          const char *add_path)
214 {
215         char *subkey, *key;
216         WERROR werr;
217         TALLOC_CTX *frame = talloc_stackframe();
218
219         if (add_path == NULL) {
220                 werr = WERR_INVALID_PARAM;
221                 goto done;
222         }
223
224         key = talloc_strdup(frame, add_path);
225
226         subkey = strrchr_m(key, '\\');
227         if (subkey == NULL) {
228                 subkey = key;
229                 key = NULL;
230         } else {
231                 *subkey = '\0';
232                 subkey++;
233         }
234
235         werr = create_key_recursive(db, key, subkey);
236
237 done:
238         talloc_free(frame);
239         return werr;
240 }
241
242 struct init_registry_key_context {
243         const char *add_path;
244 };
245
246 static NTSTATUS init_registry_key_action(struct db_context *db,
247                                          void *private_data)
248 {
249         struct init_registry_key_context *init_ctx =
250                 (struct init_registry_key_context *)private_data;
251
252         return werror_to_ntstatus(init_registry_key_internal(
253                                         db, init_ctx->add_path));
254 }
255
256 /**
257  * Initialize a key in the registry:
258  * create each component key of the specified path,
259  * wrapped in one db transaction.
260  */
261 WERROR init_registry_key(const char *add_path)
262 {
263         struct init_registry_key_context init_ctx;
264
265         if (regdb_key_exists(regdb, add_path)) {
266                 return WERR_OK;
267         }
268
269         init_ctx.add_path = add_path;
270
271         return regdb_trans_do(regdb,
272                               init_registry_key_action,
273                               &init_ctx);
274 }
275
276 /***********************************************************************
277  Open the registry data in the tdb
278  ***********************************************************************/
279
280 static void regdb_ctr_add_value(struct regval_ctr *ctr,
281                                 struct builtin_regkey_value *value)
282 {
283         switch(value->type) {
284         case REG_DWORD:
285                 regval_ctr_addvalue(ctr, value->valuename, REG_DWORD,
286                                     (uint8_t *)&value->data.dw_value,
287                                     sizeof(uint32));
288                 break;
289
290         case REG_SZ:
291                 regval_ctr_addvalue_sz(ctr, value->valuename,
292                                        value->data.string);
293                 break;
294
295         default:
296                 DEBUG(0, ("regdb_ctr_add_value: invalid value type in "
297                           "registry values [%d]\n", value->type));
298         }
299 }
300
301 static NTSTATUS init_registry_data_action(struct db_context *db,
302                                           void *private_data)
303 {
304         NTSTATUS status;
305         TALLOC_CTX *frame = talloc_stackframe();
306         struct regval_ctr *values;
307         int i;
308
309         /* loop over all of the predefined paths and add each component */
310
311         for (i=0; builtin_registry_paths[i] != NULL; i++) {
312                 if (regdb_key_exists(db, builtin_registry_paths[i])) {
313                         continue;
314                 }
315                 status = werror_to_ntstatus(init_registry_key_internal(db,
316                                                   builtin_registry_paths[i]));
317                 if (!NT_STATUS_IS_OK(status)) {
318                         goto done;
319                 }
320         }
321
322         /* loop over all of the predefined values and add each component */
323
324         for (i=0; builtin_registry_values[i].path != NULL; i++) {
325                 WERROR werr;
326
327                 werr = regval_ctr_init(frame, &values);
328                 if (!W_ERROR_IS_OK(werr)) {
329                         status = werror_to_ntstatus(werr);
330                         goto done;
331                 }
332
333                 regdb_fetch_values_internal(db,
334                                             builtin_registry_values[i].path,
335                                             values);
336
337                 /* preserve existing values across restarts. Only add new ones */
338
339                 if (!regval_ctr_key_exists(values,
340                                         builtin_registry_values[i].valuename))
341                 {
342                         regdb_ctr_add_value(values,
343                                             &builtin_registry_values[i]);
344                         status = regdb_store_values_internal(db,
345                                         builtin_registry_values[i].path,
346                                         values);
347                         if (!NT_STATUS_IS_OK(status)) {
348                                 goto done;
349                         }
350                 }
351                 TALLOC_FREE(values);
352         }
353
354         status = NT_STATUS_OK;
355
356 done:
357
358         TALLOC_FREE(frame);
359         return status;
360 }
361
362 WERROR init_registry_data(void)
363 {
364         WERROR werr;
365         TALLOC_CTX *frame = talloc_stackframe();
366         struct regval_ctr *values;
367         int i;
368
369         /*
370          * First, check for the existence of the needed keys and values.
371          * If all do already exist, we can save the writes.
372          */
373         for (i=0; builtin_registry_paths[i] != NULL; i++) {
374                 if (!regdb_key_exists(regdb, builtin_registry_paths[i])) {
375                         goto do_init;
376                 }
377         }
378
379         for (i=0; builtin_registry_values[i].path != NULL; i++) {
380                 werr = regval_ctr_init(frame, &values);
381                 W_ERROR_NOT_OK_GOTO_DONE(werr);
382
383                 regdb_fetch_values_internal(regdb,
384                                             builtin_registry_values[i].path,
385                                             values);
386                 if (!regval_ctr_key_exists(values,
387                                         builtin_registry_values[i].valuename))
388                 {
389                         TALLOC_FREE(values);
390                         goto do_init;
391                 }
392
393                 TALLOC_FREE(values);
394         }
395
396         werr = WERR_OK;
397         goto done;
398
399 do_init:
400
401         /*
402          * There are potentially quite a few store operations which are all
403          * indiviually wrapped in tdb transactions. Wrapping them in a single
404          * transaction gives just a single transaction_commit() to actually do
405          * its fsync()s. See tdb/common/transaction.c for info about nested
406          * transaction behaviour.
407          */
408
409         werr = regdb_trans_do(regdb,
410                               init_registry_data_action,
411                               NULL);
412
413 done:
414         TALLOC_FREE(frame);
415         return werr;
416 }
417
418 static int regdb_normalize_keynames_fn(struct db_record *rec,
419                                        void *private_data)
420 {
421         TALLOC_CTX *mem_ctx = talloc_tos();
422         const char *keyname;
423         NTSTATUS status;
424         TDB_DATA key;
425         TDB_DATA value;
426         struct db_context *db = (struct db_context *)private_data;
427
428         key = dbwrap_record_get_key(rec);
429         if (key.dptr == NULL || key.dsize == 0) {
430                 return 0;
431         }
432
433         value = dbwrap_record_get_value(rec);
434
435         if (db == NULL) {
436                 DEBUG(0, ("regdb_normalize_keynames_fn: ERROR: "
437                           "NULL db context handed in via private_data\n"));
438                 return 1;
439         }
440
441         if (strncmp((const char *)key.dptr, REGDB_VERSION_KEYNAME,
442             strlen(REGDB_VERSION_KEYNAME)) == 0)
443         {
444                 return 0;
445         }
446
447         keyname = strchr((const char *)key.dptr, '/');
448         if (keyname) {
449                 keyname = talloc_string_sub(mem_ctx,
450                                             (const char *)key.dptr,
451                                             "/",
452                                             "\\");
453
454                 DEBUG(2, ("regdb_normalize_keynames_fn: Convert %s to %s\n",
455                           (const char *)key.dptr,
456                           keyname));
457
458                 /* Delete the original record and store the normalized key */
459                 status = dbwrap_record_delete(rec);
460                 if (!NT_STATUS_IS_OK(status)) {
461                         DEBUG(0,("regdb_normalize_keynames_fn: "
462                                  "tdb_delete for [%s] failed!\n",
463                                  (const char *)key.dptr));
464                         return 1;
465                 }
466
467                 status = dbwrap_store_bystring(db, keyname, value, TDB_REPLACE);
468                 if (!NT_STATUS_IS_OK(status)) {
469                         DEBUG(0,("regdb_normalize_keynames_fn: "
470                                  "failed to store new record for [%s]!\n",
471                                  keyname));
472                         return 1;
473                 }
474         }
475
476         return 0;
477 }
478
479 static WERROR regdb_store_regdb_version(struct db_context *db, uint32_t version)
480 {
481         NTSTATUS status;
482         if (db == NULL) {
483                 return WERR_CAN_NOT_COMPLETE;
484         }
485
486         status = dbwrap_trans_store_int32(db, REGDB_VERSION_KEYNAME, version);
487         if (!NT_STATUS_IS_OK(status)) {
488                 DEBUG(1, ("regdb_store_regdb_version: error storing %s = %d: %s\n",
489                           REGDB_VERSION_KEYNAME, version, nt_errstr(status)));
490                 return ntstatus_to_werror(status);
491         } else {
492                 DEBUG(10, ("regdb_store_regdb_version: stored %s = %d\n",
493                           REGDB_VERSION_KEYNAME, version));
494                 return WERR_OK;
495         }
496 }
497
498 static WERROR regdb_upgrade_v1_to_v2(struct db_context *db)
499 {
500         TALLOC_CTX *mem_ctx;
501         NTSTATUS status;
502         WERROR werr;
503
504         mem_ctx = talloc_stackframe();
505
506         status = dbwrap_traverse(db, regdb_normalize_keynames_fn, db, NULL);
507         if (!NT_STATUS_IS_OK(status)) {
508                 werr = WERR_REG_IO_FAILURE;
509                 goto done;
510         }
511
512         werr = regdb_store_regdb_version(db, REGDB_VERSION_V2);
513
514 done:
515         talloc_free(mem_ctx);
516         return werr;
517 }
518
519 static int regdb_upgrade_v2_to_v3_fn(struct db_record *rec, void *private_data)
520 {
521         const char *keyname;
522         fstring subkeyname;
523         NTSTATUS status;
524         WERROR werr;
525         uint8_t *buf;
526         uint32_t buflen, len;
527         uint32_t num_items;
528         uint32_t i;
529         TDB_DATA key;
530         TDB_DATA value;
531         struct db_context *db = (struct db_context *)private_data;
532
533         key = dbwrap_record_get_key(rec);
534         if (key.dptr == NULL || key.dsize == 0) {
535                 return 0;
536         }
537
538         if (db == NULL) {
539                 DEBUG(0, ("regdb_upgrade_v2_to_v3_fn: ERROR: "
540                           "NULL db context handed in via private_data\n"));
541                 return 1;
542         }
543
544         keyname = (const char *)key.dptr;
545
546         if (strncmp(keyname, REGDB_VERSION_KEYNAME,
547                     strlen(REGDB_VERSION_KEYNAME)) == 0)
548         {
549                 return 0;
550         }
551
552         if (strncmp(keyname, REG_SORTED_SUBKEYS_PREFIX,
553                     strlen(REG_SORTED_SUBKEYS_PREFIX)) == 0)
554         {
555                 /* Delete the deprecated sorted subkeys cache. */
556
557                 DEBUG(10, ("regdb_upgrade_v2_to_v3: deleting [%s]\n", keyname));
558
559                 status = dbwrap_record_delete(rec);
560                 if (!NT_STATUS_IS_OK(status)) {
561                         DEBUG(0, ("regdb_upgrade_v2_to_v3: tdb_delete for [%s] "
562                                   "failed!\n", keyname));
563                         return 1;
564                 }
565
566                 return 0;
567         }
568
569         if (strncmp(keyname, REG_VALUE_PREFIX, strlen(REG_VALUE_PREFIX)) == 0) {
570                 DEBUG(10, ("regdb_upgrade_v2_to_v3: skipping [%s]\n", keyname));
571                 return 0;
572         }
573
574         if (strncmp(keyname, REG_SECDESC_PREFIX,
575                     strlen(REG_SECDESC_PREFIX)) == 0)
576         {
577                 DEBUG(10, ("regdb_upgrade_v2_to_v3: skipping [%s]\n", keyname));
578                 return 0;
579         }
580
581         /*
582          * Found a regular subkey list record.
583          * Walk the list and create the list record for those
584          * subkeys that don't already have one.
585          */
586         DEBUG(10, ("regdb_upgrade_v2_to_v3: scanning subkey list of [%s]\n",
587                    keyname));
588
589         value = dbwrap_record_get_value(rec);
590         buf = value.dptr;
591         buflen = value.dsize;
592
593         len = tdb_unpack(buf, buflen, "d", &num_items);
594         if (len == (uint32_t)-1) {
595                 /* invalid or empty - skip */
596                 return 0;
597         }
598
599         for (i=0; i<num_items; i++) {
600                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
601                 DEBUG(10, ("regdb_upgrade_v2_to_v3: "
602                            "writing subkey list for [%s\\%s]\n",
603                            keyname, subkeyname));
604                 werr = regdb_store_subkey_list(db, keyname, subkeyname);
605                 if (!W_ERROR_IS_OK(werr)) {
606                         return 1;
607                 }
608         }
609
610         return 0;
611 }
612
613 static WERROR regdb_upgrade_v2_to_v3(struct db_context *db)
614 {
615         NTSTATUS status;
616         WERROR werr;
617
618         status = dbwrap_traverse(db, regdb_upgrade_v2_to_v3_fn, db, NULL);
619         if (!NT_STATUS_IS_OK(status)) {
620                 werr = WERR_REG_IO_FAILURE;
621                 goto done;
622         }
623
624         werr = regdb_store_regdb_version(db, REGDB_VERSION_V3);
625
626 done:
627         return werr;
628 }
629
630 /***********************************************************************
631  Open the registry database
632  ***********************************************************************/
633
634 WERROR regdb_init(void)
635 {
636         int32_t vers_id;
637         WERROR werr;
638         NTSTATUS status;
639
640         if (regdb) {
641                 DEBUG(10, ("regdb_init: incrementing refcount (%d->%d)\n",
642                            regdb_refcount, regdb_refcount+1));
643                 regdb_refcount++;
644                 return WERR_OK;
645         }
646
647         regdb = db_open(NULL, state_path("registry.tdb"), 0,
648                               REG_TDB_FLAGS, O_RDWR, 0600);
649         if (!regdb) {
650                 regdb = db_open(NULL, state_path("registry.tdb"), 0,
651                                       REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
652                 if (!regdb) {
653                         werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
654                         DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n",
655                                 state_path("registry.tdb"), strerror(errno) ));
656                         return werr;
657                 }
658
659                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
660         }
661
662         regdb_refcount = 1;
663         DEBUG(10, ("regdb_init: registry db openend. refcount reset (%d)\n",
664                    regdb_refcount));
665
666         status = dbwrap_fetch_int32(regdb, REGDB_VERSION_KEYNAME, &vers_id);
667         if (!NT_STATUS_IS_OK(status)) {
668                 DEBUG(10, ("regdb_init: registry version uninitialized "
669                            "(got %d), initializing to version %d\n",
670                            vers_id, REGDB_VERSION_V1));
671
672                 /*
673                  * There was a regdb format version prior to version 1
674                  * which did not store a INFO/version key. The format
675                  * of this version was identical to version 1 except for
676                  * the lack of the sorted subkey cache records.
677                  * Since these are disposable, we can safely assume version
678                  * 1 if no INFO/version key is found and run the db through
679                  * the whole chain of upgrade. If the database was not
680                  * initialized, this does not harm. If it was the unversioned
681                  * version ("0"), then it do the right thing with the records.
682                  */
683                 werr = regdb_store_regdb_version(regdb, REGDB_VERSION_V1);
684                 if (!W_ERROR_IS_OK(werr)) {
685                         return werr;
686                 }
687                 vers_id = REGDB_VERSION_V1;
688         }
689
690         if (vers_id > REGDB_CODE_VERSION || vers_id == 0) {
691                 DEBUG(0, ("regdb_init: unknown registry version %d "
692                           "(code version = %d), refusing initialization\n",
693                           vers_id, REGDB_CODE_VERSION));
694                 return WERR_CAN_NOT_COMPLETE;
695         }
696
697         if (dbwrap_transaction_start(regdb) != 0) {
698                 return WERR_REG_IO_FAILURE;
699         }
700
701         if (vers_id == REGDB_VERSION_V1) {
702                 DEBUG(10, ("regdb_init: upgrading registry from version %d "
703                            "to %d\n", REGDB_VERSION_V1, REGDB_VERSION_V2));
704
705                 werr = regdb_upgrade_v1_to_v2(regdb);
706                 if (!W_ERROR_IS_OK(werr)) {
707                         dbwrap_transaction_cancel(regdb);
708                         return werr;
709                 }
710
711                 vers_id = REGDB_VERSION_V2;
712         }
713
714         if (vers_id == REGDB_VERSION_V2) {
715                 DEBUG(10, ("regdb_init: upgrading registry from version %d "
716                            "to %d\n", REGDB_VERSION_V2, REGDB_VERSION_V3));
717
718                 werr = regdb_upgrade_v2_to_v3(regdb);
719                 if (!W_ERROR_IS_OK(werr)) {
720                         dbwrap_transaction_cancel(regdb);
721                         return werr;
722                 }
723
724                 vers_id = REGDB_VERSION_V3;
725         }
726
727         /* future upgrade code should go here */
728
729         if (dbwrap_transaction_commit(regdb) != 0) {
730                 return WERR_REG_IO_FAILURE;
731         }
732
733         return WERR_OK;
734 }
735
736 /***********************************************************************
737  Open the registry.  Must already have been initialized by regdb_init()
738  ***********************************************************************/
739
740 WERROR regdb_open( void )
741 {
742         WERROR result = WERR_OK;
743
744         if ( regdb ) {
745                 DEBUG(10, ("regdb_open: incrementing refcount (%d->%d)\n",
746                            regdb_refcount, regdb_refcount+1));
747                 regdb_refcount++;
748                 return WERR_OK;
749         }
750
751         become_root();
752
753         regdb = db_open(NULL, state_path("registry.tdb"), 0,
754                               REG_TDB_FLAGS, O_RDWR, 0600);
755         if ( !regdb ) {
756                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
757                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
758                         state_path("registry.tdb"), strerror(errno) ));
759         }
760
761         unbecome_root();
762
763         regdb_refcount = 1;
764         DEBUG(10, ("regdb_open: registry db opened. refcount reset (%d)\n",
765                    regdb_refcount));
766
767         return result;
768 }
769
770 /***********************************************************************
771  ***********************************************************************/
772
773 int regdb_close( void )
774 {
775         if (regdb_refcount == 0) {
776                 return 0;
777         }
778
779         regdb_refcount--;
780
781         DEBUG(10, ("regdb_close: decrementing refcount (%d->%d)\n",
782                    regdb_refcount+1, regdb_refcount));
783
784         if ( regdb_refcount > 0 )
785                 return 0;
786
787         SMB_ASSERT( regdb_refcount >= 0 );
788
789         TALLOC_FREE(regdb);
790         return 0;
791 }
792
793 WERROR regdb_transaction_start(void)
794 {
795         return (dbwrap_transaction_start(regdb) == 0) ?
796                 WERR_OK : WERR_REG_IO_FAILURE;
797 }
798
799 WERROR regdb_transaction_commit(void)
800 {
801         return (dbwrap_transaction_commit(regdb) == 0) ?
802                 WERR_OK : WERR_REG_IO_FAILURE;
803 }
804
805 WERROR regdb_transaction_cancel(void)
806 {
807         return (dbwrap_transaction_cancel(regdb) == 0) ?
808                 WERR_OK : WERR_REG_IO_FAILURE;
809 }
810
811 /***********************************************************************
812  return the tdb sequence number of the registry tdb.
813  this is an indicator for the content of the registry
814  having changed. it will change upon regdb_init, too, though.
815  ***********************************************************************/
816 int regdb_get_seqnum(void)
817 {
818         return dbwrap_get_seqnum(regdb);
819 }
820
821
822 static WERROR regdb_delete_key_with_prefix(struct db_context *db,
823                                            const char *keyname,
824                                            const char *prefix)
825 {
826         char *path;
827         WERROR werr = WERR_NOMEM;
828         TALLOC_CTX *mem_ctx = talloc_stackframe();
829
830         if (keyname == NULL) {
831                 werr = WERR_INVALID_PARAM;
832                 goto done;
833         }
834
835         if (prefix == NULL) {
836                 path = discard_const_p(char, keyname);
837         } else {
838                 path = talloc_asprintf(mem_ctx, "%s\\%s", prefix, keyname);
839                 if (path == NULL) {
840                         goto done;
841                 }
842         }
843
844         path = normalize_reg_path(mem_ctx, path);
845         if (path == NULL) {
846                 goto done;
847         }
848
849         werr = ntstatus_to_werror(dbwrap_delete_bystring(db, path));
850
851         /* treat "not found" as ok */
852         if (W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) {
853                 werr = WERR_OK;
854         }
855
856 done:
857         talloc_free(mem_ctx);
858         return werr;
859 }
860
861
862 static WERROR regdb_delete_values(struct db_context *db, const char *keyname)
863 {
864         return regdb_delete_key_with_prefix(db, keyname, REG_VALUE_PREFIX);
865 }
866
867 static WERROR regdb_delete_secdesc(struct db_context *db, const char *keyname)
868 {
869         return regdb_delete_key_with_prefix(db, keyname, REG_SECDESC_PREFIX);
870 }
871
872 static WERROR regdb_delete_subkeylist(struct db_context *db, const char *keyname)
873 {
874         return regdb_delete_key_with_prefix(db, keyname, NULL);
875 }
876
877
878 static WERROR regdb_delete_key_lists(struct db_context *db, const char *keyname)
879 {
880         WERROR werr;
881
882         werr = regdb_delete_values(db, keyname);
883         if (!W_ERROR_IS_OK(werr)) {
884                 DEBUG(1, (__location__ " Deleting %s\\%s failed: %s\n",
885                           REG_VALUE_PREFIX, keyname, win_errstr(werr)));
886                 goto done;
887         }
888
889         werr = regdb_delete_secdesc(db, keyname);
890         if (!W_ERROR_IS_OK(werr)) {
891                 DEBUG(1, (__location__ " Deleting %s\\%s failed: %s\n",
892                           REG_SECDESC_PREFIX, keyname, win_errstr(werr)));
893                 goto done;
894         }
895
896         werr = regdb_delete_subkeylist(db, keyname);
897         if (!W_ERROR_IS_OK(werr)) {
898                 DEBUG(1, (__location__ " Deleting %s failed: %s\n",
899                           keyname, win_errstr(werr)));
900                 goto done;
901         }
902
903 done:
904         return werr;
905 }
906
907 /***********************************************************************
908  Add subkey strings to the registry tdb under a defined key
909  fmt is the same format as tdb_pack except this function only supports
910  fstrings
911  ***********************************************************************/
912
913 static WERROR regdb_store_keys_internal2(struct db_context *db,
914                                          const char *key,
915                                          struct regsubkey_ctr *ctr)
916 {
917         TDB_DATA dbuf;
918         uint8 *buffer = NULL;
919         int i = 0;
920         uint32 len, buflen;
921         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
922         char *keyname = NULL;
923         TALLOC_CTX *ctx = talloc_stackframe();
924         WERROR werr;
925
926         if (!key) {
927                 werr = WERR_INVALID_PARAM;
928                 goto done;
929         }
930
931         keyname = talloc_strdup(ctx, key);
932         if (!keyname) {
933                 werr = WERR_NOMEM;
934                 goto done;
935         }
936
937         keyname = normalize_reg_path(ctx, keyname);
938         if (!keyname) {
939                 werr = WERR_NOMEM;
940                 goto done;
941         }
942
943         /* allocate some initial memory */
944
945         buffer = (uint8 *)SMB_MALLOC(1024);
946         if (buffer == NULL) {
947                 werr = WERR_NOMEM;
948                 goto done;
949         }
950         buflen = 1024;
951         len = 0;
952
953         /* store the number of subkeys */
954
955         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
956
957         /* pack all the strings */
958
959         for (i=0; i<num_subkeys; i++) {
960                 size_t thistime;
961
962                 thistime = tdb_pack(buffer+len, buflen-len, "f",
963                                     regsubkey_ctr_specific_key(ctr, i));
964                 if (len+thistime > buflen) {
965                         size_t thistime2;
966                         /*
967                          * tdb_pack hasn't done anything because of the short
968                          * buffer, allocate extra space.
969                          */
970                         buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
971                                                    (len+thistime)*2);
972                         if(buffer == NULL) {
973                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
974                                           "memory of size [%u]\n",
975                                           (unsigned int)(len+thistime)*2));
976                                 werr = WERR_NOMEM;
977                                 goto done;
978                         }
979                         buflen = (len+thistime)*2;
980                         thistime2 = tdb_pack(
981                                 buffer+len, buflen-len, "f",
982                                 regsubkey_ctr_specific_key(ctr, i));
983                         if (thistime2 != thistime) {
984                                 DEBUG(0, ("tdb_pack failed\n"));
985                                 werr = WERR_CAN_NOT_COMPLETE;
986                                 goto done;
987                         }
988                 }
989                 len += thistime;
990         }
991
992         /* finally write out the data */
993
994         dbuf.dptr = buffer;
995         dbuf.dsize = len;
996         werr = ntstatus_to_werror(dbwrap_store_bystring(db, keyname, dbuf,
997                                                         TDB_REPLACE));
998
999 done:
1000         TALLOC_FREE(ctx);
1001         SAFE_FREE(buffer);
1002         return werr;
1003 }
1004
1005 /**
1006  * Utility function to store a new empty list of
1007  * subkeys of given key specified as parent and subkey name
1008  * (thereby creating the key).
1009  * If the parent keyname is NULL, then the "subkey" is
1010  * interpreted as a base key.
1011  * If the subkey list does already exist, it is not modified.
1012  *
1013  * Must be called from within a transaction.
1014  */
1015 static WERROR regdb_store_subkey_list(struct db_context *db, const char *parent,
1016                                       const char *key)
1017 {
1018         WERROR werr;
1019         char *path = NULL;
1020         struct regsubkey_ctr *subkeys = NULL;
1021         TALLOC_CTX *frame = talloc_stackframe();
1022
1023         if (parent == NULL) {
1024                 path = talloc_strdup(frame, key);
1025         } else {
1026                 path = talloc_asprintf(frame, "%s\\%s", parent, key);
1027         }
1028         if (!path) {
1029                 werr = WERR_NOMEM;
1030                 goto done;
1031         }
1032
1033         werr = regsubkey_ctr_init(frame, &subkeys);
1034         W_ERROR_NOT_OK_GOTO_DONE(werr);
1035
1036         werr = regdb_fetch_keys_internal(db, path, subkeys);
1037         if (W_ERROR_IS_OK(werr)) {
1038                 /* subkey list exists already - don't modify */
1039                 goto done;
1040         }
1041
1042         werr = regsubkey_ctr_reinit(subkeys);
1043         W_ERROR_NOT_OK_GOTO_DONE(werr);
1044
1045         /* create a record with 0 subkeys */
1046         werr = regdb_store_keys_internal2(db, path, subkeys);
1047         if (!W_ERROR_IS_OK(werr)) {
1048                 DEBUG(0, ("regdb_store_keys: Failed to store new record for "
1049                           "key [%s]: %s\n", path, win_errstr(werr)));
1050                 goto done;
1051         }
1052
1053 done:
1054         talloc_free(frame);
1055         return werr;
1056 }
1057
1058 /***********************************************************************
1059  Store the new subkey record and create any child key records that
1060  do not currently exist
1061  ***********************************************************************/
1062
1063 struct regdb_store_keys_context {
1064         const char *key;
1065         struct regsubkey_ctr *ctr;
1066 };
1067
1068 static NTSTATUS regdb_store_keys_action(struct db_context *db,
1069                                         void *private_data)
1070 {
1071         struct regdb_store_keys_context *store_ctx;
1072         WERROR werr;
1073         int num_subkeys, i;
1074         char *path = NULL;
1075         struct regsubkey_ctr *old_subkeys = NULL;
1076         char *oldkeyname = NULL;
1077         TALLOC_CTX *mem_ctx = talloc_stackframe();
1078
1079         store_ctx = (struct regdb_store_keys_context *)private_data;
1080
1081         /*
1082          * Re-fetch the old keys inside the transaction
1083          */
1084
1085         werr = regsubkey_ctr_init(mem_ctx, &old_subkeys);
1086         W_ERROR_NOT_OK_GOTO_DONE(werr);
1087
1088         werr = regdb_fetch_keys_internal(db, store_ctx->key, old_subkeys);
1089         if (!W_ERROR_IS_OK(werr) &&
1090             !W_ERROR_EQUAL(werr, WERR_NOT_FOUND))
1091         {
1092                 goto done;
1093         }
1094
1095         /*
1096          * Make the store operation as safe as possible without transactions:
1097          *
1098          * (1) For each subkey removed from ctr compared with old_subkeys:
1099          *
1100          *     (a) First delete the value db entry.
1101          *
1102          *     (b) Next delete the secdesc db record.
1103          *
1104          *     (c) Then delete the subkey list entry.
1105          *
1106          * (2) Now write the list of subkeys of the parent key,
1107          *     deleting removed entries and adding new ones.
1108          *
1109          * (3) Finally create the subkey list entries for the added keys.
1110          *
1111          * This way if we crash half-way in between deleting the subkeys
1112          * and storing the parent's list of subkeys, no old data can pop up
1113          * out of the blue when re-adding keys later on.
1114          */
1115
1116         /* (1) delete removed keys' lists (values/secdesc/subkeys) */
1117
1118         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
1119         for (i=0; i<num_subkeys; i++) {
1120                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
1121
1122                 if (regsubkey_ctr_key_exists(store_ctx->ctr, oldkeyname)) {
1123                         /*
1124                          * It's still around, don't delete
1125                          */
1126                         continue;
1127                 }
1128
1129                 path = talloc_asprintf(mem_ctx, "%s\\%s", store_ctx->key,
1130                                        oldkeyname);
1131                 if (!path) {
1132                         werr = WERR_NOMEM;
1133                         goto done;
1134                 }
1135
1136                 werr = regdb_delete_key_lists(db, path);
1137                 W_ERROR_NOT_OK_GOTO_DONE(werr);
1138
1139                 TALLOC_FREE(path);
1140         }
1141
1142         TALLOC_FREE(old_subkeys);
1143
1144         /* (2) store the subkey list for the parent */
1145
1146         werr = regdb_store_keys_internal2(db, store_ctx->key, store_ctx->ctr);
1147         if (!W_ERROR_IS_OK(werr)) {
1148                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
1149                          "for parent [%s]: %s\n", store_ctx->key,
1150                          win_errstr(werr)));
1151                 goto done;
1152         }
1153
1154         /* (3) now create records for any subkeys that don't already exist */
1155
1156         num_subkeys = regsubkey_ctr_numkeys(store_ctx->ctr);
1157
1158         for (i=0; i<num_subkeys; i++) {
1159                 const char *subkey;
1160
1161                 subkey = regsubkey_ctr_specific_key(store_ctx->ctr, i);
1162
1163                 werr = regdb_store_subkey_list(db, store_ctx->key, subkey);
1164                 W_ERROR_NOT_OK_GOTO_DONE(werr);
1165         }
1166
1167         werr = WERR_OK;
1168
1169 done:
1170         talloc_free(mem_ctx);
1171         return werror_to_ntstatus(werr);
1172 }
1173
1174 static bool regdb_store_keys_internal(struct db_context *db, const char *key,
1175                                       struct regsubkey_ctr *ctr)
1176 {
1177         int num_subkeys, old_num_subkeys, i;
1178         struct regsubkey_ctr *old_subkeys = NULL;
1179         TALLOC_CTX *ctx = talloc_stackframe();
1180         WERROR werr;
1181         bool ret = false;
1182         struct regdb_store_keys_context store_ctx;
1183
1184         if (!regdb_key_exists(db, key)) {
1185                 goto done;
1186         }
1187
1188         /*
1189          * fetch a list of the old subkeys so we can determine if anything has
1190          * changed
1191          */
1192
1193         werr = regsubkey_ctr_init(ctx, &old_subkeys);
1194         if (!W_ERROR_IS_OK(werr)) {
1195                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
1196                 goto done;
1197         }
1198
1199         werr = regdb_fetch_keys_internal(db, key, old_subkeys);
1200         if (!W_ERROR_IS_OK(werr) &&
1201             !W_ERROR_EQUAL(werr, WERR_NOT_FOUND))
1202         {
1203                 goto done;
1204         }
1205
1206         num_subkeys = regsubkey_ctr_numkeys(ctr);
1207         old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
1208         if ((num_subkeys && old_num_subkeys) &&
1209             (num_subkeys == old_num_subkeys)) {
1210
1211                 for (i = 0; i < num_subkeys; i++) {
1212                         if (strcmp(regsubkey_ctr_specific_key(ctr, i),
1213                                    regsubkey_ctr_specific_key(old_subkeys, i))
1214                             != 0)
1215                         {
1216                                 break;
1217                         }
1218                 }
1219                 if (i == num_subkeys) {
1220                         /*
1221                          * Nothing changed, no point to even start a tdb
1222                          * transaction
1223                          */
1224
1225                         ret = true;
1226                         goto done;
1227                 }
1228         }
1229
1230         TALLOC_FREE(old_subkeys);
1231
1232         store_ctx.key = key;
1233         store_ctx.ctr = ctr;
1234
1235         werr = regdb_trans_do(db,
1236                               regdb_store_keys_action,
1237                               &store_ctx);
1238
1239         ret = W_ERROR_IS_OK(werr);
1240
1241 done:
1242         TALLOC_FREE(ctx);
1243
1244         return ret;
1245 }
1246
1247 bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr)
1248 {
1249         return regdb_store_keys_internal(regdb, key, ctr);
1250 }
1251
1252 /**
1253  * create a subkey of a given key
1254  */
1255
1256 struct regdb_create_subkey_context {
1257         const char *key;
1258         const char *subkey;
1259 };
1260
1261 static NTSTATUS regdb_create_subkey_action(struct db_context *db,
1262                                            void *private_data)
1263 {
1264         WERROR werr;
1265         struct regdb_create_subkey_context *create_ctx;
1266         struct regsubkey_ctr *subkeys;
1267         TALLOC_CTX *mem_ctx = talloc_stackframe();
1268
1269         create_ctx = (struct regdb_create_subkey_context *)private_data;
1270
1271         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1272         W_ERROR_NOT_OK_GOTO_DONE(werr);
1273
1274         werr = regdb_fetch_keys_internal(db, create_ctx->key, subkeys);
1275         W_ERROR_NOT_OK_GOTO_DONE(werr);
1276
1277         werr = regsubkey_ctr_addkey(subkeys, create_ctx->subkey);
1278         W_ERROR_NOT_OK_GOTO_DONE(werr);
1279
1280         werr = regdb_store_keys_internal2(db, create_ctx->key, subkeys);
1281         if (!W_ERROR_IS_OK(werr)) {
1282                 DEBUG(0, (__location__ " failed to store new subkey list for "
1283                          "parent key %s: %s\n", create_ctx->key,
1284                          win_errstr(werr)));
1285         }
1286
1287         werr = regdb_store_subkey_list(db, create_ctx->key, create_ctx->subkey);
1288
1289 done:
1290         talloc_free(mem_ctx);
1291         return werror_to_ntstatus(werr);
1292 }
1293
1294 static WERROR regdb_create_subkey_internal(struct db_context *db,
1295                                            const char *key,
1296                                            const char *subkey)
1297 {
1298         WERROR werr;
1299         struct regsubkey_ctr *subkeys;
1300         TALLOC_CTX *mem_ctx = talloc_stackframe();
1301         struct regdb_create_subkey_context create_ctx;
1302
1303         if (!regdb_key_exists(db, key)) {
1304                 werr = WERR_NOT_FOUND;
1305                 goto done;
1306         }
1307
1308         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1309         W_ERROR_NOT_OK_GOTO_DONE(werr);
1310
1311         werr = regdb_fetch_keys_internal(db, key, subkeys);
1312         W_ERROR_NOT_OK_GOTO_DONE(werr);
1313
1314         if (regsubkey_ctr_key_exists(subkeys, subkey)) {
1315                 char *newkey;
1316
1317                 newkey = talloc_asprintf(mem_ctx, "%s\\%s", key, subkey);
1318                 if (newkey == NULL) {
1319                         werr = WERR_NOMEM;
1320                         goto done;
1321                 }
1322
1323                 if (regdb_key_exists(db, newkey)) {
1324                         werr = WERR_OK;
1325                         goto done;
1326                 }
1327         }
1328
1329         talloc_free(subkeys);
1330
1331         create_ctx.key = key;
1332         create_ctx.subkey = subkey;
1333
1334         werr = regdb_trans_do(db,
1335                               regdb_create_subkey_action,
1336                               &create_ctx);
1337
1338 done:
1339         talloc_free(mem_ctx);
1340         return werr;
1341 }
1342
1343 static WERROR regdb_create_subkey(const char *key, const char *subkey)
1344 {
1345         return regdb_create_subkey_internal(regdb, key, subkey);
1346 }
1347
1348 /**
1349  * create a base key
1350  */
1351
1352 struct regdb_create_basekey_context {
1353         const char *key;
1354 };
1355
1356 static NTSTATUS regdb_create_basekey_action(struct db_context *db,
1357                                             void *private_data)
1358 {
1359         WERROR werr;
1360         struct regdb_create_basekey_context *create_ctx;
1361
1362         create_ctx = (struct regdb_create_basekey_context *)private_data;
1363
1364         werr = regdb_store_subkey_list(db, NULL, create_ctx->key);
1365
1366         return werror_to_ntstatus(werr);
1367 }
1368
1369 static WERROR regdb_create_basekey(struct db_context *db, const char *key)
1370 {
1371         WERROR werr;
1372         struct regdb_create_subkey_context create_ctx;
1373
1374         create_ctx.key = key;
1375
1376         werr = regdb_trans_do(db,
1377                               regdb_create_basekey_action,
1378                               &create_ctx);
1379
1380         return werr;
1381 }
1382
1383 /**
1384  * create a subkey of a given key
1385  */
1386
1387 struct regdb_delete_subkey_context {
1388         const char *key;
1389         const char *subkey;
1390         const char *path;
1391         bool lazy;
1392 };
1393
1394 static NTSTATUS regdb_delete_subkey_action(struct db_context *db,
1395                                            void *private_data)
1396 {
1397         WERROR werr;
1398         struct regdb_delete_subkey_context *delete_ctx;
1399         struct regsubkey_ctr *subkeys;
1400         TALLOC_CTX *mem_ctx = talloc_stackframe();
1401
1402         delete_ctx = (struct regdb_delete_subkey_context *)private_data;
1403
1404         werr = regdb_delete_key_lists(db, delete_ctx->path);
1405         W_ERROR_NOT_OK_GOTO_DONE(werr);
1406
1407         if (delete_ctx->lazy) {
1408                 goto done;
1409         }
1410
1411         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1412         W_ERROR_NOT_OK_GOTO_DONE(werr);
1413
1414         werr = regdb_fetch_keys_internal(db, delete_ctx->key, subkeys);
1415         W_ERROR_NOT_OK_GOTO_DONE(werr);
1416
1417         werr = regsubkey_ctr_delkey(subkeys, delete_ctx->subkey);
1418         W_ERROR_NOT_OK_GOTO_DONE(werr);
1419
1420         werr = regdb_store_keys_internal2(db, delete_ctx->key, subkeys);
1421         if (!W_ERROR_IS_OK(werr)) {
1422                 DEBUG(0, (__location__ " failed to store new subkey_list for "
1423                          "parent key %s: %s\n", delete_ctx->key,
1424                          win_errstr(werr)));
1425         }
1426
1427 done:
1428         talloc_free(mem_ctx);
1429         return werror_to_ntstatus(werr);
1430 }
1431
1432 static WERROR regdb_delete_subkey(const char *key, const char *subkey, bool lazy)
1433 {
1434         WERROR werr;
1435         char *path;
1436         struct regdb_delete_subkey_context delete_ctx;
1437         TALLOC_CTX *mem_ctx = talloc_stackframe();
1438
1439         if (!regdb_key_exists(regdb, key)) {
1440                 werr = WERR_NOT_FOUND;
1441                 goto done;
1442         }
1443
1444         path = talloc_asprintf(mem_ctx, "%s\\%s", key, subkey);
1445         if (path == NULL) {
1446                 werr = WERR_NOMEM;
1447                 goto done;
1448         }
1449
1450         if (!regdb_key_exists(regdb, path)) {
1451                 werr = WERR_OK;
1452                 goto done;
1453         }
1454
1455         delete_ctx.key = key;
1456         delete_ctx.subkey = subkey;
1457         delete_ctx.path = path;
1458         delete_ctx.lazy = lazy;
1459
1460         werr = regdb_trans_do(regdb,
1461                               regdb_delete_subkey_action,
1462                               &delete_ctx);
1463
1464 done:
1465         talloc_free(mem_ctx);
1466         return werr;
1467 }
1468
1469 static TDB_DATA regdb_fetch_key_internal(struct db_context *db,
1470                                          TALLOC_CTX *mem_ctx, const char *key)
1471 {
1472         char *path = NULL;
1473         TDB_DATA data;
1474         NTSTATUS status;
1475
1476         path = normalize_reg_path(mem_ctx, key);
1477         if (!path) {
1478                 return make_tdb_data(NULL, 0);
1479         }
1480
1481         status = dbwrap_fetch_bystring(db, mem_ctx, path, &data);
1482         if (!NT_STATUS_IS_OK(status)) {
1483                 data = tdb_null;
1484         }
1485
1486         TALLOC_FREE(path);
1487         return data;
1488 }
1489
1490
1491 /**
1492  * Check for the existence of a key.
1493  *
1494  * Existence of a key is authoritatively defined by
1495  * the existence of the record that contains the list
1496  * of its subkeys.
1497  *
1498  * Return false, if the record does not match the correct
1499  * structure of an initial 4-byte counter and then a
1500  * list of the corresponding number of zero-terminated
1501  * strings.
1502  */
1503 static bool regdb_key_exists(struct db_context *db, const char *key)
1504 {
1505         TALLOC_CTX *mem_ctx = talloc_stackframe();
1506         TDB_DATA value;
1507         bool ret = false;
1508         char *path;
1509         uint32_t buflen;
1510         const char *buf;
1511         uint32_t num_items, i;
1512         int32_t len;
1513
1514         if (key == NULL) {
1515                 goto done;
1516         }
1517
1518         path = normalize_reg_path(mem_ctx, key);
1519         if (path == NULL) {
1520                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1521                 goto done;
1522         }
1523
1524         if (*path == '\0') {
1525                 goto done;
1526         }
1527
1528         value = regdb_fetch_key_internal(db, mem_ctx, path);
1529         if (value.dptr == NULL) {
1530                 goto done;
1531         }
1532
1533         if (value.dsize == 0) {
1534                 DEBUG(10, ("regdb_key_exists: subkeylist-record for key "
1535                           "[%s] is empty: Could be a deleted record in a "
1536                           "clustered (ctdb) environment?\n",
1537                           path));
1538                 goto done;
1539         }
1540
1541         len = tdb_unpack(value.dptr, value.dsize, "d", &num_items);
1542         if (len == (int32_t)-1) {
1543                 DEBUG(1, ("regdb_key_exists: ERROR: subkeylist-record for key "
1544                           "[%s] is invalid: Could not parse initial 4-byte "
1545                           "counter. record data length is %u.\n",
1546                           path, (unsigned int)value.dsize));
1547                 goto done;
1548         }
1549
1550         /*
1551          * Note: the tdb_unpack check above implies that len <= value.dsize
1552          */
1553         buflen = value.dsize - len;
1554         buf = (const char *)value.dptr + len;
1555
1556         len = 0;
1557
1558         for (i = 0; i < num_items; i++) {
1559                 if (buflen == 0) {
1560                         break;
1561                 }
1562                 len = strnlen(buf, buflen) + 1;
1563                 if (buflen < len) {
1564                         DEBUG(1, ("regdb_key_exists: ERROR: subkeylist-record "
1565                                   "for key [%s] is corrupt: %u items expected, "
1566                                   "item number %u is not zero terminated.\n",
1567                                   path, num_items, i+1));
1568                         goto done;
1569                 }
1570
1571                 buf += len;
1572                 buflen -= len;
1573         }
1574
1575         if (buflen > 0) {
1576                 DEBUG(1, ("regdb_key_exists: ERROR: subkeylist-record for key "
1577                           "[%s] is corrupt: %u items expected and found, but "
1578                           "the record contains additional %u bytes\n",
1579                           path, num_items, buflen));
1580                 goto done;
1581         }
1582
1583         if (i < num_items) {
1584                 DEBUG(1, ("regdb_key_exists: ERROR: subkeylist-record for key "
1585                           "[%s] is corrupt: %u items expected, but only %u "
1586                           "items found.\n",
1587                           path, num_items, i+1));
1588                 goto done;
1589         }
1590
1591         ret = true;
1592
1593 done:
1594         TALLOC_FREE(mem_ctx);
1595         return ret;
1596 }
1597
1598
1599 /***********************************************************************
1600  Retrieve an array of strings containing subkeys.  Memory should be
1601  released by the caller.
1602  ***********************************************************************/
1603
1604 static WERROR regdb_fetch_keys_internal(struct db_context *db, const char *key,
1605                                         struct regsubkey_ctr *ctr)
1606 {
1607         WERROR werr;
1608         uint32_t num_items;
1609         uint8 *buf;
1610         uint32 buflen, len;
1611         int i;
1612         fstring subkeyname;
1613         TALLOC_CTX *frame = talloc_stackframe();
1614         TDB_DATA value;
1615
1616         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
1617
1618         if (!regdb_key_exists(db, key)) {
1619                 DEBUG(10, ("key [%s] not found\n", key));
1620                 werr = WERR_NOT_FOUND;
1621                 goto done;
1622         }
1623
1624         werr = regsubkey_ctr_reinit(ctr);
1625         W_ERROR_NOT_OK_GOTO_DONE(werr);
1626
1627         werr = regsubkey_ctr_set_seqnum(ctr, dbwrap_get_seqnum(db));
1628         W_ERROR_NOT_OK_GOTO_DONE(werr);
1629
1630         value = regdb_fetch_key_internal(db, frame, key);
1631
1632         if (value.dsize == 0 || value.dptr == NULL) {
1633                 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
1634                            key));
1635                 goto done;
1636         }
1637
1638         buf = value.dptr;
1639         buflen = value.dsize;
1640         len = tdb_unpack( buf, buflen, "d", &num_items);
1641         if (len == (uint32_t)-1) {
1642                 werr = WERR_NOT_FOUND;
1643                 goto done;
1644         }
1645
1646         for (i=0; i<num_items; i++) {
1647                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
1648                 werr = regsubkey_ctr_addkey(ctr, subkeyname);
1649                 if (!W_ERROR_IS_OK(werr)) {
1650                         DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
1651                                   "failed: %s\n", win_errstr(werr)));
1652                         num_items = 0;
1653                         goto done;
1654                 }
1655         }
1656
1657         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
1658
1659 done:
1660         TALLOC_FREE(frame);
1661         return werr;
1662 }
1663
1664 int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
1665 {
1666         WERROR werr;
1667
1668         werr = regdb_fetch_keys_internal(regdb, key, ctr);
1669         if (!W_ERROR_IS_OK(werr)) {
1670                 return -1;
1671         }
1672
1673         return regsubkey_ctr_numkeys(ctr);
1674 }
1675
1676 /****************************************************************************
1677  Unpack a list of registry values frem the TDB
1678  ***************************************************************************/
1679
1680 static int regdb_unpack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1681 {
1682         int             len = 0;
1683         uint32          type;
1684         fstring valuename;
1685         uint32          size;
1686         uint8           *data_p;
1687         uint32          num_values = 0;
1688         int             i;
1689
1690         /* loop and unpack the rest of the registry values */
1691
1692         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
1693
1694         for ( i=0; i<num_values; i++ ) {
1695                 /* unpack the next regval */
1696
1697                 type = REG_NONE;
1698                 size = 0;
1699                 data_p = NULL;
1700                 valuename[0] = '\0';
1701                 len += tdb_unpack(buf+len, buflen-len, "fdB",
1702                                   valuename,
1703                                   &type,
1704                                   &size,
1705                                   &data_p);
1706
1707                 regval_ctr_addvalue(values, valuename, type,
1708                                 (uint8_t *)data_p, size);
1709                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1710
1711                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
1712         }
1713
1714         return len;
1715 }
1716
1717 /****************************************************************************
1718  Pack all values in all printer keys
1719  ***************************************************************************/
1720
1721 static int regdb_pack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1722 {
1723         int             len = 0;
1724         int             i;
1725         struct regval_blob      *val;
1726         int             num_values;
1727
1728         if ( !values )
1729                 return 0;
1730
1731         num_values = regval_ctr_numvals( values );
1732
1733         /* pack the number of values first */
1734
1735         len += tdb_pack( buf+len, buflen-len, "d", num_values );
1736
1737         /* loop over all values */
1738
1739         for ( i=0; i<num_values; i++ ) {
1740                 val = regval_ctr_specific_value( values, i );
1741                 len += tdb_pack(buf+len, buflen-len, "fdB",
1742                                 regval_name(val),
1743                                 regval_type(val),
1744                                 regval_size(val),
1745                                 regval_data_p(val) );
1746         }
1747
1748         return len;
1749 }
1750
1751 /***********************************************************************
1752  Retrieve an array of strings containing subkeys.  Memory should be
1753  released by the caller.
1754  ***********************************************************************/
1755
1756 static int regdb_fetch_values_internal(struct db_context *db, const char* key,
1757                                        struct regval_ctr *values)
1758 {
1759         char *keystr = NULL;
1760         TALLOC_CTX *ctx = talloc_stackframe();
1761         int ret = 0;
1762         TDB_DATA value;
1763         WERROR werr;
1764
1765         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
1766
1767         if (!regdb_key_exists(db, key)) {
1768                 goto done;
1769         }
1770
1771         keystr = talloc_asprintf(ctx, "%s\\%s", REG_VALUE_PREFIX, key);
1772         if (!keystr) {
1773                 goto done;
1774         }
1775
1776         werr = regval_ctr_set_seqnum(values, dbwrap_get_seqnum(db));
1777         W_ERROR_NOT_OK_GOTO_DONE(werr);
1778
1779         value = regdb_fetch_key_internal(db, ctx, keystr);
1780
1781         if (!value.dptr) {
1782                 /* all keys have zero values by default */
1783                 goto done;
1784         }
1785
1786         regdb_unpack_values(values, value.dptr, value.dsize);
1787         ret = regval_ctr_numvals(values);
1788
1789 done:
1790         TALLOC_FREE(ctx);
1791         return ret;
1792 }
1793
1794 int regdb_fetch_values(const char* key, struct regval_ctr *values)
1795 {
1796         return regdb_fetch_values_internal(regdb, key, values);
1797 }
1798
1799 static NTSTATUS regdb_store_values_internal(struct db_context *db,
1800                                             const char *key,
1801                                             struct regval_ctr *values)
1802 {
1803         TDB_DATA old_data, data;
1804         char *keystr = NULL;
1805         TALLOC_CTX *ctx = talloc_stackframe();
1806         int len;
1807         NTSTATUS status;
1808
1809         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
1810
1811         if (!regdb_key_exists(db, key)) {
1812                 status = NT_STATUS_NOT_FOUND;
1813                 goto done;
1814         }
1815
1816         ZERO_STRUCT(data);
1817
1818         len = regdb_pack_values(values, data.dptr, data.dsize);
1819         if (len <= 0) {
1820                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1821                 status = NT_STATUS_UNSUCCESSFUL;
1822                 goto done;
1823         }
1824
1825         data.dptr = talloc_array(ctx, uint8, len);
1826         data.dsize = len;
1827
1828         len = regdb_pack_values(values, data.dptr, data.dsize);
1829
1830         SMB_ASSERT( len == data.dsize );
1831
1832         keystr = talloc_asprintf(ctx, "%s\\%s", REG_VALUE_PREFIX, key );
1833         if (!keystr) {
1834                 status = NT_STATUS_NO_MEMORY;
1835                 goto done;
1836         }
1837         keystr = normalize_reg_path(ctx, keystr);
1838         if (!keystr) {
1839                 status = NT_STATUS_NO_MEMORY;
1840                 goto done;
1841         }
1842
1843         status = dbwrap_fetch_bystring(db, ctx, keystr, &old_data);
1844
1845         if (NT_STATUS_IS_OK(status)
1846             && (old_data.dptr != NULL)
1847             && (old_data.dsize == data.dsize)
1848             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1849         {
1850                 status = NT_STATUS_OK;
1851                 goto done;
1852         }
1853
1854         status = dbwrap_trans_store_bystring(db, keystr, data, TDB_REPLACE);
1855
1856 done:
1857         TALLOC_FREE(ctx);
1858         return status;
1859 }
1860
1861 struct regdb_store_values_ctx {
1862         const char *key;
1863         struct regval_ctr *values;
1864 };
1865
1866 static NTSTATUS regdb_store_values_action(struct db_context *db,
1867                                           void *private_data)
1868 {
1869         NTSTATUS status;
1870         struct regdb_store_values_ctx *ctx =
1871                 (struct regdb_store_values_ctx *)private_data;
1872
1873         status = regdb_store_values_internal(db, ctx->key, ctx->values);
1874
1875         return status;
1876 }
1877
1878 bool regdb_store_values(const char *key, struct regval_ctr *values)
1879 {
1880         WERROR werr;
1881         struct regdb_store_values_ctx ctx;
1882
1883         ctx.key = key;
1884         ctx.values = values;
1885
1886         werr = regdb_trans_do(regdb, regdb_store_values_action, &ctx);
1887
1888         return W_ERROR_IS_OK(werr);
1889 }
1890
1891 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1892                                 struct security_descriptor **psecdesc)
1893 {
1894         char *tdbkey;
1895         TDB_DATA data;
1896         NTSTATUS status;
1897         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1898         WERROR err = WERR_OK;
1899
1900         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1901
1902         if (!regdb_key_exists(regdb, key)) {
1903                 err = WERR_BADFILE;
1904                 goto done;
1905         }
1906
1907         tdbkey = talloc_asprintf(tmp_ctx, "%s\\%s", REG_SECDESC_PREFIX, key);
1908         if (tdbkey == NULL) {
1909                 err = WERR_NOMEM;
1910                 goto done;
1911         }
1912
1913         tdbkey = normalize_reg_path(tmp_ctx, tdbkey);
1914         if (tdbkey == NULL) {
1915                 err = WERR_NOMEM;
1916                 goto done;
1917         }
1918
1919         status = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey, &data);
1920         if (!NT_STATUS_IS_OK(status)) {
1921                 err = WERR_BADFILE;
1922                 goto done;
1923         }
1924
1925         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1926                                      psecdesc);
1927
1928         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1929                 err = WERR_NOMEM;
1930         } else if (!NT_STATUS_IS_OK(status)) {
1931                 err = WERR_REG_CORRUPT;
1932         }
1933
1934 done:
1935         TALLOC_FREE(tmp_ctx);
1936         return err;
1937 }
1938
1939 struct regdb_set_secdesc_ctx {
1940         const char *key;
1941         struct security_descriptor *secdesc;
1942 };
1943
1944 static NTSTATUS regdb_set_secdesc_action(struct db_context *db,
1945                                          void *private_data)
1946 {
1947         char *tdbkey;
1948         NTSTATUS status;
1949         TDB_DATA tdbdata;
1950         struct regdb_set_secdesc_ctx *ctx =
1951                 (struct regdb_set_secdesc_ctx *)private_data;
1952         TALLOC_CTX *frame = talloc_stackframe();
1953
1954         tdbkey = talloc_asprintf(frame, "%s\\%s", REG_SECDESC_PREFIX, ctx->key);
1955         if (tdbkey == NULL) {
1956                 status = NT_STATUS_NO_MEMORY;
1957                 goto done;
1958         }
1959
1960         tdbkey = normalize_reg_path(frame, tdbkey);
1961         if (tdbkey == NULL) {
1962                 status = NT_STATUS_NO_MEMORY;
1963                 goto done;
1964         }
1965
1966         if (ctx->secdesc == NULL) {
1967                 /* assuming a delete */
1968                 status = dbwrap_delete_bystring(db, tdbkey);
1969                 goto done;
1970         }
1971
1972         status = marshall_sec_desc(frame, ctx->secdesc, &tdbdata.dptr,
1973                                    &tdbdata.dsize);
1974         if (!NT_STATUS_IS_OK(status)) {
1975                 goto done;
1976         }
1977
1978         status = dbwrap_store_bystring(db, tdbkey, tdbdata, 0);
1979
1980 done:
1981         TALLOC_FREE(frame);
1982         return status;
1983 }
1984
1985 static WERROR regdb_set_secdesc(const char *key,
1986                                 struct security_descriptor *secdesc)
1987 {
1988         WERROR err;
1989         struct regdb_set_secdesc_ctx ctx;
1990
1991         if (!regdb_key_exists(regdb, key)) {
1992                 err = WERR_BADFILE;
1993                 goto done;
1994         }
1995
1996         ctx.key = key;
1997         ctx.secdesc = secdesc;
1998
1999         err = regdb_trans_do(regdb, regdb_set_secdesc_action, &ctx);
2000
2001 done:
2002         return err;
2003 }
2004
2005 bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
2006 {
2007         return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
2008 }
2009
2010 bool regdb_values_need_update(struct regval_ctr *values)
2011 {
2012         return (regdb_get_seqnum() != regval_ctr_get_seqnum(values));
2013 }
2014
2015 /*
2016  * Table of function pointers for default access
2017  */
2018
2019 struct registry_ops regdb_ops = {
2020         .fetch_subkeys = regdb_fetch_keys,
2021         .fetch_values = regdb_fetch_values,
2022         .store_subkeys = regdb_store_keys,
2023         .store_values = regdb_store_values,
2024         .create_subkey = regdb_create_subkey,
2025         .delete_subkey = regdb_delete_subkey,
2026         .get_secdesc = regdb_get_secdesc,
2027         .set_secdesc = regdb_set_secdesc,
2028         .subkeys_need_update = regdb_subkeys_need_update,
2029         .values_need_update = regdb_values_need_update
2030 };