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.h"
  34 #include "../libcli/security/secdesc.h"
  35
  36 #undef DBGC_CLASS
  37 #define DBGC_CLASS DBGC_REGISTRY
  38
  39 static struct db_context *regdb = NULL;
  40 static int regdb_refcount;
  41
  42 static bool regdb_key_exists(struct db_context *db, const char *key);
  43 static WERROR regdb_fetch_keys_internal(struct db_context *db, const char *key,
  44                                         struct regsubkey_ctr *ctr);
  45 static bool regdb_store_keys_internal(struct db_context *db, const char *key,
  46                                       struct regsubkey_ctr *ctr);
  47 static int regdb_fetch_values_internal(struct db_context *db, const char* key,
  48                                        struct regval_ctr *values);
  49 static bool regdb_store_values_internal(struct db_context *db, const char *key,
  50                                         struct regval_ctr *values);
  51 static WERROR regdb_store_subkey_list(struct db_context *db, const char *parent,
  52                                       const char *key);
  53
  54 static WERROR regdb_create_basekey(struct db_context *db, const char *key);
  55 static WERROR regdb_create_subkey_internal(struct db_context *db,
  56                                            const char *key,
  57                                            const char *subkey);
  58
  59 /* List the deepest path into the registry.  All part components will be created.*/
  60
  61 /* If you want to have a part of the path controlled by the tdb and part by
  62    a virtual registry db (e.g. printing), then you have to list the deepest path.
  63    For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print"
  64    allows the reg_db backend to handle everything up to
  65    "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook
  66    the reg_printing backend onto the last component of the path (see
  67    KEY_PRINTING_2K in include/rpc_reg.h)   --jerry */
  68
  69 static const char *builtin_registry_paths[] = {
  70         KEY_PRINTING_2K,
  71         KEY_PRINTING_PORTS,
  72         KEY_PRINTING,
  73         KEY_PRINTING "\\Forms",
  74         KEY_PRINTING "\\Printers",
  75         KEY_PRINTING "\\Environments\\Windows NT x86\\Print Processors\\winprint",
  76         KEY_SHARES,
  77         KEY_EVENTLOG,
  78         KEY_SMBCONF,
  79         KEY_PERFLIB,
  80         KEY_PERFLIB_009,
  81         KEY_GROUP_POLICY,
  82         KEY_SAMBA_GROUP_POLICY,
  83         KEY_GP_MACHINE_POLICY,
  84         KEY_GP_MACHINE_WIN_POLICY,
  85         KEY_HKCU,
  86         KEY_GP_USER_POLICY,
  87         KEY_GP_USER_WIN_POLICY,
  88         "HKLM\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\GPExtensions",
  89         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
  90         KEY_PROD_OPTIONS,
  91         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
  92         KEY_TCPIP_PARAMS,
  93         KEY_NETLOGON_PARAMS,
  94         KEY_HKU,
  95         KEY_HKCR,
  96         KEY_HKPD,
  97         KEY_HKPT,
  98          NULL };
  99
 100 struct builtin_regkey_value {
 101         const char *path;
 102         const char *valuename;
 103         uint32 type;
 104         union {
 105                 const char *string;
 106                 uint32 dw_value;
 107         } data;
 108 };
 109
 110 static struct builtin_regkey_value builtin_registry_values[] = {
 111         { KEY_PRINTING_PORTS,
 112                 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
 113         { KEY_PRINTING_2K,
 114                 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
 115         { KEY_EVENTLOG,
 116                 "DisplayName", REG_SZ, { "Event Log" } },
 117         { KEY_EVENTLOG,
 118                 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
 119         { NULL, NULL, 0, { NULL } }
 120 };
 121
 122 static WERROR create_key_recursive(struct db_context *db,
 123                                    char *path,
 124                                    const char *subkey)
 125 {
 126         WERROR werr;
 127         char *p;
 128
 129         if (subkey == NULL) {
 130                 return WERR_INVALID_PARAM;
 131         }
 132
 133         if (path == NULL) {
 134                 return regdb_create_basekey(db, subkey);
 135         }
 136
 137         p = strrchr_m(path, '\\');
 138
 139         if (p == NULL) {
 140                 werr = create_key_recursive(db, NULL, path);
 141         } else {
 142                 *p = '\0';
 143                 werr = create_key_recursive(db, path, p+1);
 144                 *p = '\\';
 145         }
 146
 147         if (!W_ERROR_IS_OK(werr)) {
 148                 goto done;
 149         }
 150
 151         werr = regdb_create_subkey_internal(db, path, subkey);
 152
 153 done:
 154         return werr;
 155 }
 156
 157 /**
 158  * Initialize a key in the registry:
 159  * create each component key of the specified path.
 160  */
 161 static WERROR init_registry_key_internal(struct db_context *db,
 162                                          const char *add_path)
 163 {
 164         char *subkey, *key;
 165         WERROR werr;
 166         TALLOC_CTX *frame = talloc_stackframe();
 167
 168         if (add_path == NULL) {
 169                 werr = WERR_INVALID_PARAM;
 170                 goto done;
 171         }
 172
 173         key = talloc_strdup(frame, add_path);
 174
 175         subkey = strrchr_m(key, '\\');
 176         if (subkey == NULL) {
 177                 subkey = key;
 178                 key = NULL;
 179         } else {
 180                 *subkey = '\0';
 181                 subkey++;
 182         }
 183
 184         werr = create_key_recursive(db, key, subkey);
 185
 186 done:
 187         talloc_free(frame);
 188         return werr;
 189 }
 190
 191 struct init_registry_key_context {
 192         const char *add_path;
 193 };
 194
 195 static NTSTATUS init_registry_key_action(struct db_context *db,
 196                                          void *private_data)
 197 {
 198         struct init_registry_key_context *init_ctx =
 199                 (struct init_registry_key_context *)private_data;
 200
 201         return werror_to_ntstatus(init_registry_key_internal(
 202                                         db, init_ctx->add_path));
 203 }
 204
 205 /**
 206  * Initialize a key in the registry:
 207  * create each component key of the specified path,
 208  * wrapped in one db transaction.
 209  */
 210 WERROR init_registry_key(const char *add_path)
 211 {
 212         struct init_registry_key_context init_ctx;
 213
 214         if (regdb_key_exists(regdb, add_path)) {
 215                 return WERR_OK;
 216         }
 217
 218         init_ctx.add_path = add_path;
 219
 220         return ntstatus_to_werror(dbwrap_trans_do(regdb,
 221                                                   init_registry_key_action,
 222                                                   &init_ctx));
 223 }
 224
 225 /***********************************************************************
 226  Open the registry data in the tdb
 227  ***********************************************************************/
 228
 229 static void regdb_ctr_add_value(struct regval_ctr *ctr,
 230                                 struct builtin_regkey_value *value)
 231 {
 232         switch(value->type) {
 233         case REG_DWORD:
 234                 regval_ctr_addvalue(ctr, value->valuename, REG_DWORD,
 235                                     (uint8_t *)&value->data.dw_value,
 236                                     sizeof(uint32));
 237                 break;
 238
 239         case REG_SZ:
 240                 regval_ctr_addvalue_sz(ctr, value->valuename,
 241                                        value->data.string);
 242                 break;
 243
 244         default:
 245                 DEBUG(0, ("regdb_ctr_add_value: invalid value type in "
 246                           "registry values [%d]\n", value->type));
 247         }
 248 }
 249
 250 static NTSTATUS init_registry_data_action(struct db_context *db,
 251                                           void *private_data)
 252 {
 253         NTSTATUS status;
 254         TALLOC_CTX *frame = talloc_stackframe();
 255         struct regval_ctr *values;
 256         int i;
 257
 258         /* loop over all of the predefined paths and add each component */
 259
 260         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 261                 if (regdb_key_exists(db, builtin_registry_paths[i])) {
 262                         continue;
 263                 }
 264                 status = werror_to_ntstatus(init_registry_key_internal(db,
 265                                                   builtin_registry_paths[i]));
 266                 if (!NT_STATUS_IS_OK(status)) {
 267                         goto done;
 268                 }
 269         }
 270
 271         /* loop over all of the predefined values and add each component */
 272
 273         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 274                 WERROR werr;
 275
 276                 werr = regval_ctr_init(frame, &values);
 277                 if (!W_ERROR_IS_OK(werr)) {
 278                         status = werror_to_ntstatus(werr);
 279                         goto done;
 280                 }
 281
 282                 regdb_fetch_values_internal(db,
 283                                             builtin_registry_values[i].path,
 284                                             values);
 285
 286                 /* preserve existing values across restarts. Only add new ones */
 287
 288                 if (!regval_ctr_key_exists(values,
 289                                         builtin_registry_values[i].valuename))
 290                 {
 291                         regdb_ctr_add_value(values,
 292                                             &builtin_registry_values[i]);
 293                         regdb_store_values_internal(db,
 294                                         builtin_registry_values[i].path,
 295                                         values);
 296                 }
 297                 TALLOC_FREE(values);
 298         }
 299
 300         status = NT_STATUS_OK;
 301
 302 done:
 303
 304         TALLOC_FREE(frame);
 305         return status;
 306 }
 307
 308 WERROR init_registry_data(void)
 309 {
 310         WERROR werr;
 311         TALLOC_CTX *frame = talloc_stackframe();
 312         struct regval_ctr *values;
 313         int i;
 314
 315         /*
 316          * First, check for the existence of the needed keys and values.
 317          * If all do already exist, we can save the writes.
 318          */
 319         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 320                 if (!regdb_key_exists(regdb, builtin_registry_paths[i])) {
 321                         goto do_init;
 322                 }
 323         }
 324
 325         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 326                 werr = regval_ctr_init(frame, &values);
 327                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 328
 329                 regdb_fetch_values_internal(regdb,
 330                                             builtin_registry_values[i].path,
 331                                             values);
 332                 if (!regval_ctr_key_exists(values,
 333                                         builtin_registry_values[i].valuename))
 334                 {
 335                         TALLOC_FREE(values);
 336                         goto do_init;
 337                 }
 338
 339                 TALLOC_FREE(values);
 340         }
 341
 342         werr = WERR_OK;
 343         goto done;
 344
 345 do_init:
 346
 347         /*
 348          * There are potentially quite a few store operations which are all
 349          * indiviually wrapped in tdb transactions. Wrapping them in a single
 350          * transaction gives just a single transaction_commit() to actually do
 351          * its fsync()s. See tdb/common/transaction.c for info about nested
 352          * transaction behaviour.
 353          */
 354
 355         werr = ntstatus_to_werror(dbwrap_trans_do(regdb,
 356                                                   init_registry_data_action,
 357                                                   NULL));
 358
 359 done:
 360         TALLOC_FREE(frame);
 361         return werr;
 362 }
 363
 364 static int regdb_normalize_keynames_fn(struct db_record *rec,
 365                                        void *private_data)
 366 {
 367         TALLOC_CTX *mem_ctx = talloc_tos();
 368         const char *keyname;
 369         NTSTATUS status;
 370
 371         if (rec->key.dptr == NULL || rec->key.dsize == 0) {
 372                 return 0;
 373         }
 374
 375         keyname = strchr((const char *) rec->key.dptr, '/');
 376         if (keyname) {
 377                 struct db_record new_rec;
 378
 379                 keyname = talloc_string_sub(mem_ctx,
 380                                             (const char *) rec->key.dptr,
 381                                             "/",
 382                                             "\\");
 383
 384                 DEBUG(2, ("regdb_normalize_keynames_fn: Convert %s to %s\n",
 385                           (const char *) rec->key.dptr,
 386                           keyname));
 387
 388                 new_rec.value = rec->value;
 389                 new_rec.key = string_term_tdb_data(keyname);
 390                 new_rec.private_data = rec->private_data;
 391
 392                 /* Delete the original record and store the normalized key */
 393                 status = rec->delete_rec(rec);
 394                 if (!NT_STATUS_IS_OK(status)) {
 395                         DEBUG(0,("regdb_normalize_keynames_fn: "
 396                                  "tdb_delete for [%s] failed!\n",
 397                                  rec->key.dptr));
 398                         return 1;
 399                 }
 400
 401                 status = rec->store(&new_rec, new_rec.value, TDB_REPLACE);
 402                 if (!NT_STATUS_IS_OK(status)) {
 403                         DEBUG(0,("regdb_normalize_keynames_fn: "
 404                                  "failed to store new record for [%s]!\n",
 405                                  keyname));
 406                         return 1;
 407                 }
 408         }
 409
 410         return 0;
 411 }
 412
 413 static WERROR regdb_store_regdb_version(struct db_context *db, uint32_t version)
 414 {
 415         NTSTATUS status;
 416         const char *version_keyname = "INFO/version";
 417
 418         if (db == NULL) {
 419                 return WERR_CAN_NOT_COMPLETE;
 420         }
 421
 422         status = dbwrap_trans_store_int32(db, version_keyname, version);
 423         if (!NT_STATUS_IS_OK(status)) {
 424                 DEBUG(1, ("regdb_store_regdb_version: error storing %s = %d: %s\n",
 425                           version_keyname, version, nt_errstr(status)));
 426                 return ntstatus_to_werror(status);
 427         } else {
 428                 DEBUG(10, ("regdb_store_regdb_version: stored %s = %d\n",
 429                           version_keyname, version));
 430                 return WERR_OK;
 431         }
 432 }
 433
 434 static WERROR regdb_upgrade_v1_to_v2(struct db_context *db)
 435 {
 436         TALLOC_CTX *mem_ctx;
 437         int rc;
 438         WERROR werr;
 439
 440         mem_ctx = talloc_stackframe();
 441
 442         rc = regdb->traverse(db, regdb_normalize_keynames_fn, mem_ctx);
 443
 444         talloc_free(mem_ctx);
 445
 446         if (rc < 0) {
 447                 return WERR_REG_IO_FAILURE;
 448         }
 449
 450         werr = regdb_store_regdb_version(db, REGVER_V2);
 451         return werr;
 452 }
 453
 454 static int regdb_upgrade_v2_to_v3_fn(struct db_record *rec, void *private_data)
 455 {
 456         const char *keyname;
 457         fstring subkeyname;
 458         NTSTATUS status;
 459         WERROR werr;
 460         uint8_t *buf;
 461         uint32_t buflen, len;
 462         uint32_t num_items;
 463         uint32_t i;
 464
 465         if (rec->key.dptr == NULL || rec->key.dsize == 0) {
 466                 return 0;
 467         }
 468
 469         keyname = (const char *)rec->key.dptr;
 470
 471         if (strncmp(keyname, REG_SORTED_SUBKEYS_PREFIX,
 472                     strlen(REG_SORTED_SUBKEYS_PREFIX)) == 0)
 473         {
 474                 /* Delete the deprecated sorted subkeys cache. */
 475
 476                 DEBUG(10, ("regdb_upgrade_v2_to_v3: deleting [%s]\n", keyname));
 477
 478                 status = rec->delete_rec(rec);
 479                 if (!NT_STATUS_IS_OK(status)) {
 480                         DEBUG(0, ("regdb_upgrade_v2_to_v3: tdb_delete for [%s] "
 481                                   "failed!\n", keyname));
 482                         return 1;
 483                 }
 484
 485                 return 0;
 486         }
 487
 488         if (strncmp(keyname, REG_VALUE_PREFIX, strlen(REG_VALUE_PREFIX)) == 0) {
 489                 DEBUG(10, ("regdb_upgrade_v2_to_v3: skipping [%s]\n", keyname));
 490                 return 0;
 491         }
 492
 493         if (strncmp(keyname, REG_SECDESC_PREFIX,
 494                     strlen(REG_SECDESC_PREFIX)) == 0)
 495         {
 496                 DEBUG(10, ("regdb_upgrade_v2_to_v3: skipping [%s]\n", keyname));
 497                 return 0;
 498         }
 499
 500         /*
 501          * Found a regular subkey list record.
 502          * Walk the list and create the list record for those
 503          * subkeys that don't already have one.
 504          */
 505         DEBUG(10, ("regdb_upgrade_v2_to_v3: scanning subkey list of [%s]\n",
 506                    keyname));
 507
 508         buf = rec->value.dptr;
 509         buflen = rec->value.dsize;
 510
 511         len = tdb_unpack(buf, buflen, "d", &num_items);
 512         if (len == (uint32_t)-1) {
 513                 /* invalid or empty - skip */
 514                 return 0;
 515         }
 516
 517         for (i=0; i<num_items; i++) {
 518                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
 519                 DEBUG(10, ("regdb_upgrade_v2_to_v3: "
 520                            "writing subkey list for [%s\\%s]\n",
 521                            keyname, subkeyname));
 522                 werr = regdb_store_subkey_list(regdb, keyname, subkeyname);
 523                 if (!W_ERROR_IS_OK(werr)) {
 524                         return 1;
 525                 }
 526         }
 527
 528         return 0;
 529 }
 530
 531 static WERROR regdb_upgrade_v2_to_v3(struct db_context *db)
 532 {
 533         int rc;
 534         WERROR werr;
 535         TALLOC_CTX *frame = talloc_stackframe();
 536
 537         rc = regdb->traverse(db, regdb_upgrade_v2_to_v3_fn, frame);
 538         if (rc < 0) {
 539                 werr = WERR_REG_IO_FAILURE;
 540                 goto done;
 541         }
 542
 543         werr = regdb_store_regdb_version(db, REGVER_V3);
 544
 545 done:
 546         talloc_free(frame);
 547         return werr;
 548 }
 549
 550 /***********************************************************************
 551  Open the registry database
 552  ***********************************************************************/
 553
 554 WERROR regdb_init(void)
 555 {
 556         const char *vstring = "INFO/version";
 557         uint32 vers_id, expected_version;
 558         WERROR werr;
 559
 560         if (regdb) {
 561                 DEBUG(10, ("regdb_init: incrementing refcount (%d->%d)\n",
 562                            regdb_refcount, regdb_refcount+1));
 563                 regdb_refcount++;
 564                 return WERR_OK;
 565         }
 566
 567         regdb = db_open(NULL, state_path("registry.tdb"), 0,
 568                               REG_TDB_FLAGS, O_RDWR, 0600);
 569         if (!regdb) {
 570                 regdb = db_open(NULL, state_path("registry.tdb"), 0,
 571                                       REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
 572                 if (!regdb) {
 573                         werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
 574                         DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n",
 575                                 state_path("registry.tdb"), strerror(errno) ));
 576                         return werr;
 577                 }
 578
 579                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
 580         }
 581
 582         regdb_refcount = 1;
 583         DEBUG(10, ("regdb_init: registry db openend. refcount reset (%d)\n",
 584                    regdb_refcount));
 585
 586         expected_version = REGVER_V3;
 587
 588         vers_id = dbwrap_fetch_int32(regdb, vstring);
 589         if (vers_id == -1) {
 590                 DEBUG(10, ("regdb_init: registry version uninitialized "
 591                            "(got %d), initializing to version %d\n",
 592                            vers_id, expected_version));
 593
 594                 werr = regdb_store_regdb_version(regdb, expected_version);
 595                 return werr;
 596         }
 597
 598         if (vers_id > expected_version || vers_id == 0) {
 599                 DEBUG(1, ("regdb_init: unknown registry version %d "
 600                           "(code version = %d), refusing initialization\n",
 601                           vers_id, expected_version));
 602                 return WERR_CAN_NOT_COMPLETE;
 603         }
 604
 605         if (regdb->transaction_start(regdb) != 0) {
 606                 return WERR_REG_IO_FAILURE;
 607         }
 608
 609         if (vers_id == REGVER_V1) {
 610                 DEBUG(10, ("regdb_init: upgrading registry fromversion %d "
 611                            "to %d\n", REGVER_V1, REGVER_V2));
 612
 613                 werr = regdb_upgrade_v1_to_v2(regdb);
 614                 if (!W_ERROR_IS_OK(werr)) {
 615                         regdb->transaction_cancel(regdb);
 616                         return werr;
 617                 }
 618
 619                 vers_id = REGVER_V2;
 620         }
 621
 622         if (vers_id == REGVER_V2) {
 623                 DEBUG(10, ("regdb_init: upgrading registry from version %d "
 624                            "to %d\n", REGVER_V2, REGVER_V3));
 625
 626                 werr = regdb_upgrade_v2_to_v3(regdb);
 627                 if (!W_ERROR_IS_OK(werr)) {
 628                         regdb->transaction_cancel(regdb);
 629                         return werr;
 630                 }
 631
 632                 vers_id = REGVER_V3;
 633         }
 634
 635         /* future upgrade code should go here */
 636
 637         if (regdb->transaction_commit(regdb) != 0) {
 638                 return WERR_REG_IO_FAILURE;
 639         }
 640
 641         return WERR_OK;
 642 }
 643
 644 /***********************************************************************
 645  Open the registry.  Must already have been initialized by regdb_init()
 646  ***********************************************************************/
 647
 648 WERROR regdb_open( void )
 649 {
 650         WERROR result = WERR_OK;
 651
 652         if ( regdb ) {
 653                 DEBUG(10, ("regdb_open: incrementing refcount (%d->%d)\n",
 654                            regdb_refcount, regdb_refcount+1));
 655                 regdb_refcount++;
 656                 return WERR_OK;
 657         }
 658
 659         become_root();
 660
 661         regdb = db_open(NULL, state_path("registry.tdb"), 0,
 662                               REG_TDB_FLAGS, O_RDWR, 0600);
 663         if ( !regdb ) {
 664                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
 665                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
 666                         state_path("registry.tdb"), strerror(errno) ));
 667         }
 668
 669         unbecome_root();
 670
 671         regdb_refcount = 1;
 672         DEBUG(10, ("regdb_open: registry db opened. refcount reset (%d)\n",
 673                    regdb_refcount));
 674
 675         return result;
 676 }
 677
 678 /***********************************************************************
 679  ***********************************************************************/
 680
 681 int regdb_close( void )
 682 {
 683         if (regdb_refcount == 0) {
 684                 return 0;
 685         }
 686
 687         regdb_refcount--;
 688
 689         DEBUG(10, ("regdb_close: decrementing refcount (%d->%d)\n",
 690                    regdb_refcount+1, regdb_refcount));
 691
 692         if ( regdb_refcount > 0 )
 693                 return 0;
 694
 695         SMB_ASSERT( regdb_refcount >= 0 );
 696
 697         TALLOC_FREE(regdb);
 698         return 0;
 699 }
 700
 701 WERROR regdb_transaction_start(void)
 702 {
 703         return (regdb->transaction_start(regdb) == 0) ?
 704                 WERR_OK : WERR_REG_IO_FAILURE;
 705 }
 706
 707 WERROR regdb_transaction_commit(void)
 708 {
 709         return (regdb->transaction_commit(regdb) == 0) ?
 710                 WERR_OK : WERR_REG_IO_FAILURE;
 711 }
 712
 713 WERROR regdb_transaction_cancel(void)
 714 {
 715         return (regdb->transaction_cancel(regdb) == 0) ?
 716                 WERR_OK : WERR_REG_IO_FAILURE;
 717 }
 718
 719 /***********************************************************************
 720  return the tdb sequence number of the registry tdb.
 721  this is an indicator for the content of the registry
 722  having changed. it will change upon regdb_init, too, though.
 723  ***********************************************************************/
 724 int regdb_get_seqnum(void)
 725 {
 726         return regdb->get_seqnum(regdb);
 727 }
 728
 729
 730 static WERROR regdb_delete_key_with_prefix(struct db_context *db,
 731                                            const char *keyname,
 732                                            const char *prefix)
 733 {
 734         char *path;
 735         WERROR werr = WERR_NOMEM;
 736         TALLOC_CTX *mem_ctx = talloc_stackframe();
 737
 738         if (keyname == NULL) {
 739                 werr = WERR_INVALID_PARAM;
 740                 goto done;
 741         }
 742
 743         if (prefix == NULL) {
 744                 path = discard_const_p(char, keyname);
 745         } else {
 746                 path = talloc_asprintf(mem_ctx, "%s\\%s", prefix, keyname);
 747                 if (path == NULL) {
 748                         goto done;
 749                 }
 750         }
 751
 752         path = normalize_reg_path(mem_ctx, path);
 753         if (path == NULL) {
 754                 goto done;
 755         }
 756
 757         werr = ntstatus_to_werror(dbwrap_delete_bystring(db, path));
 758
 759         /* treat "not found" as ok */
 760         if (W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) {
 761                 werr = WERR_OK;
 762         }
 763
 764 done:
 765         talloc_free(mem_ctx);
 766         return werr;
 767 }
 768
 769
 770 static WERROR regdb_delete_values(struct db_context *db, const char *keyname)
 771 {
 772         return regdb_delete_key_with_prefix(db, keyname, REG_VALUE_PREFIX);
 773 }
 774
 775 static WERROR regdb_delete_secdesc(struct db_context *db, const char *keyname)
 776 {
 777         return regdb_delete_key_with_prefix(db, keyname, REG_SECDESC_PREFIX);
 778 }
 779
 780 static WERROR regdb_delete_subkeylist(struct db_context *db, const char *keyname)
 781 {
 782         return regdb_delete_key_with_prefix(db, keyname, NULL);
 783 }
 784
 785
 786 static WERROR regdb_delete_key_lists(struct db_context *db, const char *keyname)
 787 {
 788         WERROR werr;
 789
 790         werr = regdb_delete_values(db, keyname);
 791         if (!W_ERROR_IS_OK(werr)) {
 792                 DEBUG(1, (__location__ " Deleting %s\\%s failed: %s\n",
 793                           REG_VALUE_PREFIX, keyname, win_errstr(werr)));
 794                 goto done;
 795         }
 796
 797         werr = regdb_delete_secdesc(db, keyname);
 798         if (!W_ERROR_IS_OK(werr)) {
 799                 DEBUG(1, (__location__ " Deleting %s\\%s failed: %s\n",
 800                           REG_SECDESC_PREFIX, keyname, win_errstr(werr)));
 801                 goto done;
 802         }
 803
 804         werr = regdb_delete_subkeylist(db, keyname);
 805         if (!W_ERROR_IS_OK(werr)) {
 806                 DEBUG(1, (__location__ " Deleting %s failed: %s\n",
 807                           keyname, win_errstr(werr)));
 808                 goto done;
 809         }
 810
 811 done:
 812         return werr;
 813 }
 814
 815 /***********************************************************************
 816  Add subkey strings to the registry tdb under a defined key
 817  fmt is the same format as tdb_pack except this function only supports
 818  fstrings
 819  ***********************************************************************/
 820
 821 static WERROR regdb_store_keys_internal2(struct db_context *db,
 822                                          const char *key,
 823                                          struct regsubkey_ctr *ctr)
 824 {
 825         TDB_DATA dbuf;
 826         uint8 *buffer = NULL;
 827         int i = 0;
 828         uint32 len, buflen;
 829         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
 830         char *keyname = NULL;
 831         TALLOC_CTX *ctx = talloc_stackframe();
 832         WERROR werr;
 833
 834         if (!key) {
 835                 werr = WERR_INVALID_PARAM;
 836                 goto done;
 837         }
 838
 839         keyname = talloc_strdup(ctx, key);
 840         if (!keyname) {
 841                 werr = WERR_NOMEM;
 842                 goto done;
 843         }
 844
 845         keyname = normalize_reg_path(ctx, keyname);
 846         if (!keyname) {
 847                 werr = WERR_NOMEM;
 848                 goto done;
 849         }
 850
 851         /* allocate some initial memory */
 852
 853         buffer = (uint8 *)SMB_MALLOC(1024);
 854         if (buffer == NULL) {
 855                 werr = WERR_NOMEM;
 856                 goto done;
 857         }
 858         buflen = 1024;
 859         len = 0;
 860
 861         /* store the number of subkeys */
 862
 863         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
 864
 865         /* pack all the strings */
 866
 867         for (i=0; i<num_subkeys; i++) {
 868                 size_t thistime;
 869
 870                 thistime = tdb_pack(buffer+len, buflen-len, "f",
 871                                     regsubkey_ctr_specific_key(ctr, i));
 872                 if (len+thistime > buflen) {
 873                         size_t thistime2;
 874                         /*
 875                          * tdb_pack hasn't done anything because of the short
 876                          * buffer, allocate extra space.
 877                          */
 878                         buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
 879                                                    (len+thistime)*2);
 880                         if(buffer == NULL) {
 881                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
 882                                           "memory of size [%u]\n",
 883                                           (unsigned int)(len+thistime)*2));
 884                                 werr = WERR_NOMEM;
 885                                 goto done;
 886                         }
 887                         buflen = (len+thistime)*2;
 888                         thistime2 = tdb_pack(
 889                                 buffer+len, buflen-len, "f",
 890                                 regsubkey_ctr_specific_key(ctr, i));
 891                         if (thistime2 != thistime) {
 892                                 DEBUG(0, ("tdb_pack failed\n"));
 893                                 werr = WERR_CAN_NOT_COMPLETE;
 894                                 goto done;
 895                         }
 896                 }
 897                 len += thistime;
 898         }
 899
 900         /* finally write out the data */
 901
 902         dbuf.dptr = buffer;
 903         dbuf.dsize = len;
 904         werr = ntstatus_to_werror(dbwrap_store_bystring(db, keyname, dbuf,
 905                                                         TDB_REPLACE));
 906
 907 done:
 908         TALLOC_FREE(ctx);
 909         SAFE_FREE(buffer);
 910         return werr;
 911 }
 912
 913 /**
 914  * Utility function to store a new empty list of
 915  * subkeys of given key specified as parent and subkey name
 916  * (thereby creating the key).
 917  * If the parent keyname is NULL, then the "subkey" is
 918  * interpreted as a base key.
 919  * If the subkey list does already exist, it is not modified.
 920  *
 921  * Must be called from within a transaction.
 922  */
 923 static WERROR regdb_store_subkey_list(struct db_context *db, const char *parent,
 924                                       const char *key)
 925 {
 926         WERROR werr;
 927         char *path = NULL;
 928         struct regsubkey_ctr *subkeys = NULL;
 929         TALLOC_CTX *frame = talloc_stackframe();
 930
 931         if (parent == NULL) {
 932                 path = talloc_strdup(frame, key);
 933         } else {
 934                 path = talloc_asprintf(frame, "%s\\%s", parent, key);
 935         }
 936         if (!path) {
 937                 werr = WERR_NOMEM;
 938                 goto done;
 939         }
 940
 941         werr = regsubkey_ctr_init(frame, &subkeys);
 942         W_ERROR_NOT_OK_GOTO_DONE(werr);
 943
 944         werr = regdb_fetch_keys_internal(db, path, subkeys);
 945         if (W_ERROR_IS_OK(werr)) {
 946                 /* subkey list exists already - don't modify */
 947                 goto done;
 948         }
 949
 950         werr = regsubkey_ctr_reinit(subkeys);
 951         W_ERROR_NOT_OK_GOTO_DONE(werr);
 952
 953         /* create a record with 0 subkeys */
 954         werr = regdb_store_keys_internal2(db, path, subkeys);
 955         if (!W_ERROR_IS_OK(werr)) {
 956                 DEBUG(0, ("regdb_store_keys: Failed to store new record for "
 957                           "key [%s]: %s\n", path, win_errstr(werr)));
 958                 goto done;
 959         }
 960
 961 done:
 962         talloc_free(frame);
 963         return werr;
 964 }
 965
 966 /***********************************************************************
 967  Store the new subkey record and create any child key records that
 968  do not currently exist
 969  ***********************************************************************/
 970
 971 struct regdb_store_keys_context {
 972         const char *key;
 973         struct regsubkey_ctr *ctr;
 974 };
 975
 976 static NTSTATUS regdb_store_keys_action(struct db_context *db,
 977                                         void *private_data)
 978 {
 979         struct regdb_store_keys_context *store_ctx;
 980         WERROR werr;
 981         int num_subkeys, i;
 982         char *path = NULL;
 983         struct regsubkey_ctr *old_subkeys = NULL;
 984         char *oldkeyname = NULL;
 985         TALLOC_CTX *mem_ctx = talloc_stackframe();
 986
 987         store_ctx = (struct regdb_store_keys_context *)private_data;
 988
 989         /*
 990          * Re-fetch the old keys inside the transaction
 991          */
 992
 993         werr = regsubkey_ctr_init(mem_ctx, &old_subkeys);
 994         W_ERROR_NOT_OK_GOTO_DONE(werr);
 995
 996         werr = regdb_fetch_keys_internal(db, store_ctx->key, old_subkeys);
 997         if (!W_ERROR_IS_OK(werr) &&
 998             !W_ERROR_EQUAL(werr, WERR_NOT_FOUND))
 999         {
1000                 goto done;
1001         }
1002
1003         /*
1004          * Make the store operation as safe as possible without transactions:
1005          *
1006          * (1) For each subkey removed from ctr compared with old_subkeys:
1007          *
1008          *     (a) First delete the value db entry.
1009          *
1010          *     (b) Next delete the secdesc db record.
1011          *
1012          *     (c) Then delete the subkey list entry.
1013          *
1014          * (2) Now write the list of subkeys of the parent key,
1015          *     deleting removed entries and adding new ones.
1016          *
1017          * (3) Finally create the subkey list entries for the added keys.
1018          *
1019          * This way if we crash half-way in between deleting the subkeys
1020          * and storing the parent's list of subkeys, no old data can pop up
1021          * out of the blue when re-adding keys later on.
1022          */
1023
1024         /* (1) delete removed keys' lists (values/secdesc/subkeys) */
1025
1026         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
1027         for (i=0; i<num_subkeys; i++) {
1028                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
1029
1030                 if (regsubkey_ctr_key_exists(store_ctx->ctr, oldkeyname)) {
1031                         /*
1032                          * It's still around, don't delete
1033                          */
1034                         continue;
1035                 }
1036
1037                 path = talloc_asprintf(mem_ctx, "%s\\%s", store_ctx->key,
1038                                        oldkeyname);
1039                 if (!path) {
1040                         werr = WERR_NOMEM;
1041                         goto done;
1042                 }
1043
1044                 werr = regdb_delete_key_lists(db, path);
1045                 W_ERROR_NOT_OK_GOTO_DONE(werr);
1046
1047                 TALLOC_FREE(path);
1048         }
1049
1050         TALLOC_FREE(old_subkeys);
1051
1052         /* (2) store the subkey list for the parent */
1053
1054         werr = regdb_store_keys_internal2(db, store_ctx->key, store_ctx->ctr);
1055         if (!W_ERROR_IS_OK(werr)) {
1056                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
1057                          "for parent [%s]: %s\n", store_ctx->key,
1058                          win_errstr(werr)));
1059                 goto done;
1060         }
1061
1062         /* (3) now create records for any subkeys that don't already exist */
1063
1064         num_subkeys = regsubkey_ctr_numkeys(store_ctx->ctr);
1065
1066         for (i=0; i<num_subkeys; i++) {
1067                 const char *subkey;
1068
1069                 subkey = regsubkey_ctr_specific_key(store_ctx->ctr, i);
1070
1071                 werr = regdb_store_subkey_list(db, store_ctx->key, subkey);
1072                 W_ERROR_NOT_OK_GOTO_DONE(werr);
1073         }
1074
1075         werr = WERR_OK;
1076
1077 done:
1078         talloc_free(mem_ctx);
1079         return werror_to_ntstatus(werr);
1080 }
1081
1082 static bool regdb_store_keys_internal(struct db_context *db, const char *key,
1083                                       struct regsubkey_ctr *ctr)
1084 {
1085         int num_subkeys, old_num_subkeys, i;
1086         struct regsubkey_ctr *old_subkeys = NULL;
1087         TALLOC_CTX *ctx = talloc_stackframe();
1088         WERROR werr;
1089         bool ret = false;
1090         struct regdb_store_keys_context store_ctx;
1091
1092         if (!regdb_key_exists(db, key)) {
1093                 goto done;
1094         }
1095
1096         /*
1097          * fetch a list of the old subkeys so we can determine if anything has
1098          * changed
1099          */
1100
1101         werr = regsubkey_ctr_init(ctx, &old_subkeys);
1102         if (!W_ERROR_IS_OK(werr)) {
1103                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
1104                 goto done;
1105         }
1106
1107         werr = regdb_fetch_keys_internal(db, key, old_subkeys);
1108         if (!W_ERROR_IS_OK(werr) &&
1109             !W_ERROR_EQUAL(werr, WERR_NOT_FOUND))
1110         {
1111                 goto done;
1112         }
1113
1114         num_subkeys = regsubkey_ctr_numkeys(ctr);
1115         old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
1116         if ((num_subkeys && old_num_subkeys) &&
1117             (num_subkeys == old_num_subkeys)) {
1118
1119                 for (i = 0; i < num_subkeys; i++) {
1120                         if (strcmp(regsubkey_ctr_specific_key(ctr, i),
1121                                    regsubkey_ctr_specific_key(old_subkeys, i))
1122                             != 0)
1123                         {
1124                                 break;
1125                         }
1126                 }
1127                 if (i == num_subkeys) {
1128                         /*
1129                          * Nothing changed, no point to even start a tdb
1130                          * transaction
1131                          */
1132
1133                         ret = true;
1134                         goto done;
1135                 }
1136         }
1137
1138         TALLOC_FREE(old_subkeys);
1139
1140         store_ctx.key = key;
1141         store_ctx.ctr = ctr;
1142
1143         werr = ntstatus_to_werror(dbwrap_trans_do(db,
1144                                                   regdb_store_keys_action,
1145                                                   &store_ctx));
1146
1147         ret = W_ERROR_IS_OK(werr);
1148
1149 done:
1150         TALLOC_FREE(ctx);
1151
1152         return ret;
1153 }
1154
1155 bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr)
1156 {
1157         return regdb_store_keys_internal(regdb, key, ctr);
1158 }
1159
1160 /**
1161  * create a subkey of a given key
1162  */
1163
1164 struct regdb_create_subkey_context {
1165         const char *key;
1166         const char *subkey;
1167 };
1168
1169 static NTSTATUS regdb_create_subkey_action(struct db_context *db,
1170                                            void *private_data)
1171 {
1172         WERROR werr;
1173         struct regdb_create_subkey_context *create_ctx;
1174         struct regsubkey_ctr *subkeys;
1175         TALLOC_CTX *mem_ctx = talloc_stackframe();
1176
1177         create_ctx = (struct regdb_create_subkey_context *)private_data;
1178
1179         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1180         W_ERROR_NOT_OK_GOTO_DONE(werr);
1181
1182         werr = regdb_fetch_keys_internal(db, create_ctx->key, subkeys);
1183         W_ERROR_NOT_OK_GOTO_DONE(werr);
1184
1185         werr = regsubkey_ctr_addkey(subkeys, create_ctx->subkey);
1186         W_ERROR_NOT_OK_GOTO_DONE(werr);
1187
1188         werr = regdb_store_keys_internal2(db, create_ctx->key, subkeys);
1189         if (!W_ERROR_IS_OK(werr)) {
1190                 DEBUG(0, (__location__ " failed to store new subkey list for "
1191                          "parent key %s: %s\n", create_ctx->key,
1192                          win_errstr(werr)));
1193         }
1194
1195         werr = regdb_store_subkey_list(db, create_ctx->key, create_ctx->subkey);
1196
1197 done:
1198         talloc_free(mem_ctx);
1199         return werror_to_ntstatus(werr);
1200 }
1201
1202 static WERROR regdb_create_subkey_internal(struct db_context *db,
1203                                            const char *key,
1204                                            const char *subkey)
1205 {
1206         WERROR werr;
1207         struct regsubkey_ctr *subkeys;
1208         TALLOC_CTX *mem_ctx = talloc_stackframe();
1209         struct regdb_create_subkey_context create_ctx;
1210
1211         if (!regdb_key_exists(db, key)) {
1212                 werr = WERR_NOT_FOUND;
1213                 goto done;
1214         }
1215
1216         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1217         W_ERROR_NOT_OK_GOTO_DONE(werr);
1218
1219         werr = regdb_fetch_keys_internal(db, key, subkeys);
1220         W_ERROR_NOT_OK_GOTO_DONE(werr);
1221
1222         if (regsubkey_ctr_key_exists(subkeys, subkey)) {
1223                 werr = WERR_OK;
1224                 goto done;
1225         }
1226
1227         talloc_free(subkeys);
1228
1229         create_ctx.key = key;
1230         create_ctx.subkey = subkey;
1231
1232         werr = ntstatus_to_werror(dbwrap_trans_do(db,
1233                                                   regdb_create_subkey_action,
1234                                                   &create_ctx));
1235
1236 done:
1237         talloc_free(mem_ctx);
1238         return werr;
1239 }
1240
1241 static WERROR regdb_create_subkey(const char *key, const char *subkey)
1242 {
1243         return regdb_create_subkey_internal(regdb, key, subkey);
1244 }
1245
1246 /**
1247  * create a base key
1248  */
1249
1250 struct regdb_create_basekey_context {
1251         const char *key;
1252 };
1253
1254 static NTSTATUS regdb_create_basekey_action(struct db_context *db,
1255                                             void *private_data)
1256 {
1257         WERROR werr;
1258         struct regdb_create_basekey_context *create_ctx;
1259
1260         create_ctx = (struct regdb_create_basekey_context *)private_data;
1261
1262         werr = regdb_store_subkey_list(db, NULL, create_ctx->key);
1263
1264         return werror_to_ntstatus(werr);
1265 }
1266
1267 static WERROR regdb_create_basekey(struct db_context *db, const char *key)
1268 {
1269         WERROR werr;
1270         struct regdb_create_subkey_context create_ctx;
1271
1272         create_ctx.key = key;
1273
1274         werr = ntstatus_to_werror(dbwrap_trans_do(db,
1275                                                   regdb_create_basekey_action,
1276                                                   &create_ctx));
1277
1278         return werr;
1279 }
1280
1281 /**
1282  * create a subkey of a given key
1283  */
1284
1285 struct regdb_delete_subkey_context {
1286         const char *key;
1287         const char *subkey;
1288         const char *path;
1289 };
1290
1291 static NTSTATUS regdb_delete_subkey_action(struct db_context *db,
1292                                            void *private_data)
1293 {
1294         WERROR werr;
1295         struct regdb_delete_subkey_context *delete_ctx;
1296         struct regsubkey_ctr *subkeys;
1297         TALLOC_CTX *mem_ctx = talloc_stackframe();
1298
1299         delete_ctx = (struct regdb_delete_subkey_context *)private_data;
1300
1301         werr = regdb_delete_key_lists(db, delete_ctx->path);
1302         W_ERROR_NOT_OK_GOTO_DONE(werr);
1303
1304         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1305         W_ERROR_NOT_OK_GOTO_DONE(werr);
1306
1307         werr = regdb_fetch_keys_internal(db, delete_ctx->key, subkeys);
1308         W_ERROR_NOT_OK_GOTO_DONE(werr);
1309
1310         werr = regsubkey_ctr_delkey(subkeys, delete_ctx->subkey);
1311         W_ERROR_NOT_OK_GOTO_DONE(werr);
1312
1313         werr = regdb_store_keys_internal2(db, delete_ctx->key, subkeys);
1314         if (!W_ERROR_IS_OK(werr)) {
1315                 DEBUG(0, (__location__ " failed to store new subkey_list for "
1316                          "parent key %s: %s\n", delete_ctx->key,
1317                          win_errstr(werr)));
1318         }
1319
1320 done:
1321         talloc_free(mem_ctx);
1322         return werror_to_ntstatus(werr);
1323 }
1324
1325 static WERROR regdb_delete_subkey(const char *key, const char *subkey)
1326 {
1327         WERROR werr;
1328         char *path;
1329         struct regdb_delete_subkey_context delete_ctx;
1330         TALLOC_CTX *mem_ctx = talloc_stackframe();
1331
1332         if (!regdb_key_exists(regdb, key)) {
1333                 werr = WERR_NOT_FOUND;
1334                 goto done;
1335         }
1336
1337         path = talloc_asprintf(mem_ctx, "%s\\%s", key, subkey);
1338         if (path == NULL) {
1339                 werr = WERR_NOMEM;
1340                 goto done;
1341         }
1342
1343         if (!regdb_key_exists(regdb, path)) {
1344                 werr = WERR_OK;
1345                 goto done;
1346         }
1347
1348         delete_ctx.key = key;
1349         delete_ctx.subkey = subkey;
1350         delete_ctx.path = path;
1351
1352         werr = ntstatus_to_werror(dbwrap_trans_do(regdb,
1353                                                   regdb_delete_subkey_action,
1354                                                   &delete_ctx));
1355
1356 done:
1357         talloc_free(mem_ctx);
1358         return werr;
1359 }
1360
1361 static TDB_DATA regdb_fetch_key_internal(struct db_context *db,
1362                                          TALLOC_CTX *mem_ctx, const char *key)
1363 {
1364         char *path = NULL;
1365         TDB_DATA data;
1366
1367         path = normalize_reg_path(mem_ctx, key);
1368         if (!path) {
1369                 return make_tdb_data(NULL, 0);
1370         }
1371
1372         data = dbwrap_fetch_bystring(db, mem_ctx, path);
1373
1374         TALLOC_FREE(path);
1375         return data;
1376 }
1377
1378
1379 /**
1380  * Check for the existence of a key.
1381  *
1382  * Existence of a key is authoritatively defined by
1383  * the existence of the record that contains the list
1384  * of its subkeys.
1385  */
1386 static bool regdb_key_exists(struct db_context *db, const char *key)
1387 {
1388         TALLOC_CTX *mem_ctx = talloc_stackframe();
1389         TDB_DATA value;
1390         bool ret = false;
1391         char *path;
1392
1393         if (key == NULL) {
1394                 goto done;
1395         }
1396
1397         path = normalize_reg_path(mem_ctx, key);
1398         if (path == NULL) {
1399                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1400                 goto done;
1401         }
1402
1403         if (*path == '\0') {
1404                 goto done;
1405         }
1406
1407         value = regdb_fetch_key_internal(db, mem_ctx, path);
1408         ret = (value.dptr != NULL);
1409
1410 done:
1411         TALLOC_FREE(mem_ctx);
1412         return ret;
1413 }
1414
1415
1416 /***********************************************************************
1417  Retrieve an array of strings containing subkeys.  Memory should be
1418  released by the caller.
1419  ***********************************************************************/
1420
1421 static WERROR regdb_fetch_keys_internal(struct db_context *db, const char *key,
1422                                         struct regsubkey_ctr *ctr)
1423 {
1424         WERROR werr;
1425         uint32_t num_items;
1426         uint8 *buf;
1427         uint32 buflen, len;
1428         int i;
1429         fstring subkeyname;
1430         TALLOC_CTX *frame = talloc_stackframe();
1431         TDB_DATA value;
1432
1433         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
1434
1435         if (!regdb_key_exists(db, key)) {
1436                 DEBUG(10, ("key [%s] not found\n", key));
1437                 werr = WERR_NOT_FOUND;
1438                 goto done;
1439         }
1440
1441         werr = regsubkey_ctr_set_seqnum(ctr, db->get_seqnum(db));
1442         W_ERROR_NOT_OK_GOTO_DONE(werr);
1443
1444         value = regdb_fetch_key_internal(db, frame, key);
1445
1446         if (value.dsize == 0 || value.dptr == NULL) {
1447                 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
1448                            key));
1449                 goto done;
1450         }
1451
1452         buf = value.dptr;
1453         buflen = value.dsize;
1454         len = tdb_unpack( buf, buflen, "d", &num_items);
1455         if (len == (uint32_t)-1) {
1456                 werr = WERR_NOT_FOUND;
1457                 goto done;
1458         }
1459
1460         werr = regsubkey_ctr_reinit(ctr);
1461         W_ERROR_NOT_OK_GOTO_DONE(werr);
1462
1463         for (i=0; i<num_items; i++) {
1464                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
1465                 werr = regsubkey_ctr_addkey(ctr, subkeyname);
1466                 if (!W_ERROR_IS_OK(werr)) {
1467                         DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
1468                                   "failed: %s\n", win_errstr(werr)));
1469                         num_items = 0;
1470                         goto done;
1471                 }
1472         }
1473
1474         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
1475
1476 done:
1477         TALLOC_FREE(frame);
1478         return werr;
1479 }
1480
1481 int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
1482 {
1483         WERROR werr;
1484
1485         werr = regdb_fetch_keys_internal(regdb, key, ctr);
1486         if (!W_ERROR_IS_OK(werr)) {
1487                 return -1;
1488         }
1489
1490         return regsubkey_ctr_numkeys(ctr);
1491 }
1492
1493 /****************************************************************************
1494  Unpack a list of registry values frem the TDB
1495  ***************************************************************************/
1496
1497 static int regdb_unpack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1498 {
1499         int             len = 0;
1500         uint32          type;
1501         fstring valuename;
1502         uint32          size;
1503         uint8           *data_p;
1504         uint32          num_values = 0;
1505         int             i;
1506
1507         /* loop and unpack the rest of the registry values */
1508
1509         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
1510
1511         for ( i=0; i<num_values; i++ ) {
1512                 /* unpack the next regval */
1513
1514                 type = REG_NONE;
1515                 size = 0;
1516                 data_p = NULL;
1517                 valuename[0] = '\0';
1518                 len += tdb_unpack(buf+len, buflen-len, "fdB",
1519                                   valuename,
1520                                   &type,
1521                                   &size,
1522                                   &data_p);
1523
1524                 regval_ctr_addvalue(values, valuename, type,
1525                                 (uint8_t *)data_p, size);
1526                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1527
1528                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
1529         }
1530
1531         return len;
1532 }
1533
1534 /****************************************************************************
1535  Pack all values in all printer keys
1536  ***************************************************************************/
1537
1538 static int regdb_pack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1539 {
1540         int             len = 0;
1541         int             i;
1542         struct regval_blob      *val;
1543         int             num_values;
1544
1545         if ( !values )
1546                 return 0;
1547
1548         num_values = regval_ctr_numvals( values );
1549
1550         /* pack the number of values first */
1551
1552         len += tdb_pack( buf+len, buflen-len, "d", num_values );
1553
1554         /* loop over all values */
1555
1556         for ( i=0; i<num_values; i++ ) {
1557                 val = regval_ctr_specific_value( values, i );
1558                 len += tdb_pack(buf+len, buflen-len, "fdB",
1559                                 regval_name(val),
1560                                 regval_type(val),
1561                                 regval_size(val),
1562                                 regval_data_p(val) );
1563         }
1564
1565         return len;
1566 }
1567
1568 /***********************************************************************
1569  Retrieve an array of strings containing subkeys.  Memory should be
1570  released by the caller.
1571  ***********************************************************************/
1572
1573 static int regdb_fetch_values_internal(struct db_context *db, const char* key,
1574                                        struct regval_ctr *values)
1575 {
1576         char *keystr = NULL;
1577         TALLOC_CTX *ctx = talloc_stackframe();
1578         int ret = 0;
1579         TDB_DATA value;
1580         WERROR werr;
1581
1582         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
1583
1584         if (!regdb_key_exists(db, key)) {
1585                 goto done;
1586         }
1587
1588         keystr = talloc_asprintf(ctx, "%s\\%s", REG_VALUE_PREFIX, key);
1589         if (!keystr) {
1590                 goto done;
1591         }
1592
1593         werr = regval_ctr_set_seqnum(values, db->get_seqnum(db));
1594         W_ERROR_NOT_OK_GOTO_DONE(werr);
1595
1596         value = regdb_fetch_key_internal(db, ctx, keystr);
1597
1598         if (!value.dptr) {
1599                 /* all keys have zero values by default */
1600                 goto done;
1601         }
1602
1603         regdb_unpack_values(values, value.dptr, value.dsize);
1604         ret = regval_ctr_numvals(values);
1605
1606 done:
1607         TALLOC_FREE(ctx);
1608         return ret;
1609 }
1610
1611 int regdb_fetch_values(const char* key, struct regval_ctr *values)
1612 {
1613         return regdb_fetch_values_internal(regdb, key, values);
1614 }
1615
1616 static bool regdb_store_values_internal(struct db_context *db, const char *key,
1617                                         struct regval_ctr *values)
1618 {
1619         TDB_DATA old_data, data;
1620         char *keystr = NULL;
1621         TALLOC_CTX *ctx = talloc_stackframe();
1622         int len;
1623         NTSTATUS status;
1624         bool result = false;
1625
1626         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
1627
1628         if (!regdb_key_exists(db, key)) {
1629                 goto done;
1630         }
1631
1632         ZERO_STRUCT(data);
1633
1634         len = regdb_pack_values(values, data.dptr, data.dsize);
1635         if (len <= 0) {
1636                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1637                 goto done;
1638         }
1639
1640         data.dptr = talloc_array(ctx, uint8, len);
1641         data.dsize = len;
1642
1643         len = regdb_pack_values(values, data.dptr, data.dsize);
1644
1645         SMB_ASSERT( len == data.dsize );
1646
1647         keystr = talloc_asprintf(ctx, "%s\\%s", REG_VALUE_PREFIX, key );
1648         if (!keystr) {
1649                 goto done;
1650         }
1651         keystr = normalize_reg_path(ctx, keystr);
1652         if (!keystr) {
1653                 goto done;
1654         }
1655
1656         old_data = dbwrap_fetch_bystring(db, ctx, keystr);
1657
1658         if ((old_data.dptr != NULL)
1659             && (old_data.dsize == data.dsize)
1660             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1661         {
1662                 result = true;
1663                 goto done;
1664         }
1665
1666         status = dbwrap_trans_store_bystring(db, keystr, data, TDB_REPLACE);
1667
1668         result = NT_STATUS_IS_OK(status);
1669
1670 done:
1671         TALLOC_FREE(ctx);
1672         return result;
1673 }
1674
1675 bool regdb_store_values(const char *key, struct regval_ctr *values)
1676 {
1677         return regdb_store_values_internal(regdb, key, values);
1678 }
1679
1680 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1681                                 struct security_descriptor **psecdesc)
1682 {
1683         char *tdbkey;
1684         TDB_DATA data;
1685         NTSTATUS status;
1686         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1687         WERROR err = WERR_OK;
1688
1689         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1690
1691         if (!regdb_key_exists(regdb, key)) {
1692                 err = WERR_BADFILE;
1693                 goto done;
1694         }
1695
1696         tdbkey = talloc_asprintf(tmp_ctx, "%s\\%s", REG_SECDESC_PREFIX, key);
1697         if (tdbkey == NULL) {
1698                 err = WERR_NOMEM;
1699                 goto done;
1700         }
1701
1702         tdbkey = normalize_reg_path(tmp_ctx, tdbkey);
1703         if (tdbkey == NULL) {
1704                 err = WERR_NOMEM;
1705                 goto done;
1706         }
1707
1708         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
1709         if (data.dptr == NULL) {
1710                 err = WERR_BADFILE;
1711                 goto done;
1712         }
1713
1714         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1715                                      psecdesc);
1716
1717         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1718                 err = WERR_NOMEM;
1719         } else if (!NT_STATUS_IS_OK(status)) {
1720                 err = WERR_REG_CORRUPT;
1721         }
1722
1723 done:
1724         TALLOC_FREE(tmp_ctx);
1725         return err;
1726 }
1727
1728 static WERROR regdb_set_secdesc(const char *key,
1729                                 struct security_descriptor *secdesc)
1730 {
1731         TALLOC_CTX *mem_ctx = talloc_stackframe();
1732         char *tdbkey;
1733         WERROR err = WERR_NOMEM;
1734         TDB_DATA tdbdata;
1735
1736         if (!regdb_key_exists(regdb, key)) {
1737                 err = WERR_BADFILE;
1738                 goto done;
1739         }
1740
1741         tdbkey = talloc_asprintf(mem_ctx, "%s\\%s", REG_SECDESC_PREFIX, key);
1742         if (tdbkey == NULL) {
1743                 goto done;
1744         }
1745
1746         tdbkey = normalize_reg_path(mem_ctx, tdbkey);
1747         if (tdbkey == NULL) {
1748                 err = WERR_NOMEM;
1749                 goto done;
1750         }
1751
1752         if (secdesc == NULL) {
1753                 /* assuming a delete */
1754                 err = ntstatus_to_werror(dbwrap_trans_delete_bystring(regdb,
1755                                                                       tdbkey));
1756                 goto done;
1757         }
1758
1759         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1760                                                    &tdbdata.dptr,
1761                                                    &tdbdata.dsize));
1762         W_ERROR_NOT_OK_GOTO_DONE(err);
1763
1764         err = ntstatus_to_werror(dbwrap_trans_store_bystring(regdb, tdbkey,
1765                                                              tdbdata, 0));
1766
1767  done:
1768         TALLOC_FREE(mem_ctx);
1769         return err;
1770 }
1771
1772 bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
1773 {
1774         return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
1775 }
1776
1777 bool regdb_values_need_update(struct regval_ctr *values)
1778 {
1779         return (regdb_get_seqnum() != regval_ctr_get_seqnum(values));
1780 }
1781
1782 /*
1783  * Table of function pointers for default access
1784  */
1785
1786 struct registry_ops regdb_ops = {
1787         .fetch_subkeys = regdb_fetch_keys,
1788         .fetch_values = regdb_fetch_values,
1789         .store_subkeys = regdb_store_keys,
1790         .store_values = regdb_store_values,
1791         .create_subkey = regdb_create_subkey,
1792         .delete_subkey = regdb_delete_subkey,
1793         .get_secdesc = regdb_get_secdesc,
1794         .set_secdesc = regdb_set_secdesc,
1795         .subkeys_need_update = regdb_subkeys_need_update,
1796         .values_need_update = regdb_values_need_update
1797 };