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 static struct db_context *regdb = NULL;
  41 static int regdb_refcount;
  42
  43 static bool regdb_key_exists(struct db_context *db, const char *key);
  44 static WERROR regdb_fetch_keys_internal(struct db_context *db, const char *key,
  45                                         struct regsubkey_ctr *ctr);
  46 static bool regdb_store_keys_internal(struct db_context *db, const char *key,
  47                                       struct regsubkey_ctr *ctr);
  48 static int regdb_fetch_values_internal(struct db_context *db, const char* key,
  49                                        struct regval_ctr *values);
  50 static bool regdb_store_values_internal(struct db_context *db, const char *key,
  51                                         struct regval_ctr *values);
  52 static WERROR regdb_store_subkey_list(struct db_context *db, const char *parent,
  53                                       const char *key);
  54
  55 static WERROR regdb_create_basekey(struct db_context *db, const char *key);
  56 static WERROR regdb_create_subkey_internal(struct db_context *db,
  57                                            const char *key,
  58                                            const char *subkey);
  59
  60 /* List the deepest path into the registry.  All part components will be created.*/
  61
  62 /* If you want to have a part of the path controlled by the tdb and part by
  63    a virtual registry db (e.g. printing), then you have to list the deepest path.
  64    For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print"
  65    allows the reg_db backend to handle everything up to
  66    "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook
  67    the reg_printing backend onto the last component of the path (see
  68    KEY_PRINTING_2K in include/rpc_reg.h)   --jerry */
  69
  70 static const char *builtin_registry_paths[] = {
  71         KEY_PRINTING_2K,
  72         KEY_PRINTING_PORTS,
  73         KEY_PRINTING,
  74         KEY_PRINTING "\\Forms",
  75         KEY_PRINTING "\\Printers",
  76         KEY_PRINTING "\\Environments\\Windows NT x86\\Print Processors\\winprint",
  77         KEY_SHARES,
  78         KEY_EVENTLOG,
  79         KEY_SMBCONF,
  80         KEY_PERFLIB,
  81         KEY_PERFLIB_009,
  82         KEY_GROUP_POLICY,
  83         KEY_SAMBA_GROUP_POLICY,
  84         KEY_GP_MACHINE_POLICY,
  85         KEY_GP_MACHINE_WIN_POLICY,
  86         KEY_HKCU,
  87         KEY_GP_USER_POLICY,
  88         KEY_GP_USER_WIN_POLICY,
  89         "HKLM\\Software\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon\\GPExtensions",
  90         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
  91         KEY_PROD_OPTIONS,
  92         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
  93         KEY_TCPIP_PARAMS,
  94         KEY_NETLOGON_PARAMS,
  95         KEY_HKU,
  96         KEY_HKCR,
  97         KEY_HKPD,
  98         KEY_HKPT,
  99          NULL };
 100
 101 struct builtin_regkey_value {
 102         const char *path;
 103         const char *valuename;
 104         uint32 type;
 105         union {
 106                 const char *string;
 107                 uint32 dw_value;
 108         } data;
 109 };
 110
 111 static struct builtin_regkey_value builtin_registry_values[] = {
 112         { KEY_PRINTING_PORTS,
 113                 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
 114         { KEY_PRINTING_2K,
 115                 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
 116         { KEY_EVENTLOG,
 117                 "DisplayName", REG_SZ, { "Event Log" } },
 118         { KEY_EVENTLOG,
 119                 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
 120         { NULL, NULL, 0, { NULL } }
 121 };
 122
 123 static WERROR create_key_recursive(struct db_context *db,
 124                                    char *path,
 125                                    const char *subkey)
 126 {
 127         WERROR werr;
 128         char *p;
 129
 130         if (subkey == NULL) {
 131                 return WERR_INVALID_PARAM;
 132         }
 133
 134         if (path == NULL) {
 135                 return regdb_create_basekey(db, subkey);
 136         }
 137
 138         p = strrchr_m(path, '\\');
 139
 140         if (p == NULL) {
 141                 werr = create_key_recursive(db, NULL, path);
 142         } else {
 143                 *p = '\0';
 144                 werr = create_key_recursive(db, path, p+1);
 145                 *p = '\\';
 146         }
 147
 148         if (!W_ERROR_IS_OK(werr)) {
 149                 goto done;
 150         }
 151
 152         werr = regdb_create_subkey_internal(db, path, subkey);
 153
 154 done:
 155         return werr;
 156 }
 157
 158 /**
 159  * Initialize a key in the registry:
 160  * create each component key of the specified path.
 161  */
 162 static WERROR init_registry_key_internal(struct db_context *db,
 163                                          const char *add_path)
 164 {
 165         char *subkey, *key;
 166         WERROR werr;
 167         TALLOC_CTX *frame = talloc_stackframe();
 168
 169         if (add_path == NULL) {
 170                 werr = WERR_INVALID_PARAM;
 171                 goto done;
 172         }
 173
 174         key = talloc_strdup(frame, add_path);
 175
 176         subkey = strrchr_m(key, '\\');
 177         if (subkey == NULL) {
 178                 subkey = key;
 179                 key = NULL;
 180         } else {
 181                 *subkey = '\0';
 182                 subkey++;
 183         }
 184
 185         werr = create_key_recursive(db, key, subkey);
 186
 187 done:
 188         talloc_free(frame);
 189         return werr;
 190 }
 191
 192 struct init_registry_key_context {
 193         const char *add_path;
 194 };
 195
 196 static NTSTATUS init_registry_key_action(struct db_context *db,
 197                                          void *private_data)
 198 {
 199         struct init_registry_key_context *init_ctx =
 200                 (struct init_registry_key_context *)private_data;
 201
 202         return werror_to_ntstatus(init_registry_key_internal(
 203                                         db, init_ctx->add_path));
 204 }
 205
 206 /**
 207  * Initialize a key in the registry:
 208  * create each component key of the specified path,
 209  * wrapped in one db transaction.
 210  */
 211 WERROR init_registry_key(const char *add_path)
 212 {
 213         struct init_registry_key_context init_ctx;
 214
 215         if (regdb_key_exists(regdb, add_path)) {
 216                 return WERR_OK;
 217         }
 218
 219         init_ctx.add_path = add_path;
 220
 221         return ntstatus_to_werror(dbwrap_trans_do(regdb,
 222                                                   init_registry_key_action,
 223                                                   &init_ctx));
 224 }
 225
 226 /***********************************************************************
 227  Open the registry data in the tdb
 228  ***********************************************************************/
 229
 230 static void regdb_ctr_add_value(struct regval_ctr *ctr,
 231                                 struct builtin_regkey_value *value)
 232 {
 233         switch(value->type) {
 234         case REG_DWORD:
 235                 regval_ctr_addvalue(ctr, value->valuename, REG_DWORD,
 236                                     (uint8_t *)&value->data.dw_value,
 237                                     sizeof(uint32));
 238                 break;
 239
 240         case REG_SZ:
 241                 regval_ctr_addvalue_sz(ctr, value->valuename,
 242                                        value->data.string);
 243                 break;
 244
 245         default:
 246                 DEBUG(0, ("regdb_ctr_add_value: invalid value type in "
 247                           "registry values [%d]\n", value->type));
 248         }
 249 }
 250
 251 static NTSTATUS init_registry_data_action(struct db_context *db,
 252                                           void *private_data)
 253 {
 254         NTSTATUS status;
 255         TALLOC_CTX *frame = talloc_stackframe();
 256         struct regval_ctr *values;
 257         int i;
 258
 259         /* loop over all of the predefined paths and add each component */
 260
 261         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 262                 if (regdb_key_exists(db, builtin_registry_paths[i])) {
 263                         continue;
 264                 }
 265                 status = werror_to_ntstatus(init_registry_key_internal(db,
 266                                                   builtin_registry_paths[i]));
 267                 if (!NT_STATUS_IS_OK(status)) {
 268                         goto done;
 269                 }
 270         }
 271
 272         /* loop over all of the predefined values and add each component */
 273
 274         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 275                 WERROR werr;
 276
 277                 werr = regval_ctr_init(frame, &values);
 278                 if (!W_ERROR_IS_OK(werr)) {
 279                         status = werror_to_ntstatus(werr);
 280                         goto done;
 281                 }
 282
 283                 regdb_fetch_values_internal(db,
 284                                             builtin_registry_values[i].path,
 285                                             values);
 286
 287                 /* preserve existing values across restarts. Only add new ones */
 288
 289                 if (!regval_ctr_key_exists(values,
 290                                         builtin_registry_values[i].valuename))
 291                 {
 292                         regdb_ctr_add_value(values,
 293                                             &builtin_registry_values[i]);
 294                         regdb_store_values_internal(db,
 295                                         builtin_registry_values[i].path,
 296                                         values);
 297                 }
 298                 TALLOC_FREE(values);
 299         }
 300
 301         status = NT_STATUS_OK;
 302
 303 done:
 304
 305         TALLOC_FREE(frame);
 306         return status;
 307 }
 308
 309 WERROR init_registry_data(void)
 310 {
 311         WERROR werr;
 312         TALLOC_CTX *frame = talloc_stackframe();
 313         struct regval_ctr *values;
 314         int i;
 315
 316         /*
 317          * First, check for the existence of the needed keys and values.
 318          * If all do already exist, we can save the writes.
 319          */
 320         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 321                 if (!regdb_key_exists(regdb, builtin_registry_paths[i])) {
 322                         goto do_init;
 323                 }
 324         }
 325
 326         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 327                 werr = regval_ctr_init(frame, &values);
 328                 W_ERROR_NOT_OK_GOTO_DONE(werr);
 329
 330                 regdb_fetch_values_internal(regdb,
 331                                             builtin_registry_values[i].path,
 332                                             values);
 333                 if (!regval_ctr_key_exists(values,
 334                                         builtin_registry_values[i].valuename))
 335                 {
 336                         TALLOC_FREE(values);
 337                         goto do_init;
 338                 }
 339
 340                 TALLOC_FREE(values);
 341         }
 342
 343         werr = WERR_OK;
 344         goto done;
 345
 346 do_init:
 347
 348         /*
 349          * There are potentially quite a few store operations which are all
 350          * indiviually wrapped in tdb transactions. Wrapping them in a single
 351          * transaction gives just a single transaction_commit() to actually do
 352          * its fsync()s. See tdb/common/transaction.c for info about nested
 353          * transaction behaviour.
 354          */
 355
 356         werr = ntstatus_to_werror(dbwrap_trans_do(regdb,
 357                                                   init_registry_data_action,
 358                                                   NULL));
 359
 360 done:
 361         TALLOC_FREE(frame);
 362         return werr;
 363 }
 364
 365 static int regdb_normalize_keynames_fn(struct db_record *rec,
 366                                        void *private_data)
 367 {
 368         TALLOC_CTX *mem_ctx = talloc_tos();
 369         const char *keyname;
 370         NTSTATUS status;
 371         struct db_context *db = (struct db_context *)private_data;
 372
 373         if (rec->key.dptr == NULL || rec->key.dsize == 0) {
 374                 return 0;
 375         }
 376
 377         if (db == NULL) {
 378                 DEBUG(0, ("regdb_normalize_keynames_fn: ERROR: "
 379                           "NULL db context handed in via private_data\n"));
 380                 return 1;
 381         }
 382
 383         keyname = strchr((const char *) rec->key.dptr, '/');
 384         if (keyname) {
 385                 keyname = talloc_string_sub(mem_ctx,
 386                                             (const char *) rec->key.dptr,
 387                                             "/",
 388                                             "\\");
 389
 390                 DEBUG(2, ("regdb_normalize_keynames_fn: Convert %s to %s\n",
 391                           (const char *) rec->key.dptr,
 392                           keyname));
 393
 394                 /* Delete the original record and store the normalized key */
 395                 status = rec->delete_rec(rec);
 396                 if (!NT_STATUS_IS_OK(status)) {
 397                         DEBUG(0,("regdb_normalize_keynames_fn: "
 398                                  "tdb_delete for [%s] failed!\n",
 399                                  rec->key.dptr));
 400                         return 1;
 401                 }
 402
 403                 status = dbwrap_store_bystring(db, keyname, rec->value,
 404                                                TDB_REPLACE);
 405                 if (!NT_STATUS_IS_OK(status)) {
 406                         DEBUG(0,("regdb_normalize_keynames_fn: "
 407                                  "failed to store new record for [%s]!\n",
 408                                  keyname));
 409                         return 1;
 410                 }
 411         }
 412
 413         return 0;
 414 }
 415
 416 static WERROR regdb_store_regdb_version(struct db_context *db, uint32_t version)
 417 {
 418         NTSTATUS status;
 419         const char *version_keyname = "INFO/version";
 420
 421         if (db == NULL) {
 422                 return WERR_CAN_NOT_COMPLETE;
 423         }
 424
 425         status = dbwrap_trans_store_int32(db, version_keyname, version);
 426         if (!NT_STATUS_IS_OK(status)) {
 427                 DEBUG(1, ("regdb_store_regdb_version: error storing %s = %d: %s\n",
 428                           version_keyname, version, nt_errstr(status)));
 429                 return ntstatus_to_werror(status);
 430         } else {
 431                 DEBUG(10, ("regdb_store_regdb_version: stored %s = %d\n",
 432                           version_keyname, version));
 433                 return WERR_OK;
 434         }
 435 }
 436
 437 static WERROR regdb_upgrade_v1_to_v2(struct db_context *db)
 438 {
 439         TALLOC_CTX *mem_ctx;
 440         int rc;
 441         WERROR werr;
 442
 443         mem_ctx = talloc_stackframe();
 444
 445         rc = db->traverse(db, regdb_normalize_keynames_fn, db);
 446
 447         talloc_free(mem_ctx);
 448
 449         if (rc < 0) {
 450                 return WERR_REG_IO_FAILURE;
 451         }
 452
 453         werr = regdb_store_regdb_version(db, REGVER_V2);
 454         return werr;
 455 }
 456
 457 static int regdb_upgrade_v2_to_v3_fn(struct db_record *rec, void *private_data)
 458 {
 459         const char *keyname;
 460         fstring subkeyname;
 461         NTSTATUS status;
 462         WERROR werr;
 463         uint8_t *buf;
 464         uint32_t buflen, len;
 465         uint32_t num_items;
 466         uint32_t i;
 467
 468         if (rec->key.dptr == NULL || rec->key.dsize == 0) {
 469                 return 0;
 470         }
 471
 472         keyname = (const char *)rec->key.dptr;
 473
 474         if (strncmp(keyname, REG_SORTED_SUBKEYS_PREFIX,
 475                     strlen(REG_SORTED_SUBKEYS_PREFIX)) == 0)
 476         {
 477                 /* Delete the deprecated sorted subkeys cache. */
 478
 479                 DEBUG(10, ("regdb_upgrade_v2_to_v3: deleting [%s]\n", keyname));
 480
 481                 status = rec->delete_rec(rec);
 482                 if (!NT_STATUS_IS_OK(status)) {
 483                         DEBUG(0, ("regdb_upgrade_v2_to_v3: tdb_delete for [%s] "
 484                                   "failed!\n", keyname));
 485                         return 1;
 486                 }
 487
 488                 return 0;
 489         }
 490
 491         if (strncmp(keyname, REG_VALUE_PREFIX, strlen(REG_VALUE_PREFIX)) == 0) {
 492                 DEBUG(10, ("regdb_upgrade_v2_to_v3: skipping [%s]\n", keyname));
 493                 return 0;
 494         }
 495
 496         if (strncmp(keyname, REG_SECDESC_PREFIX,
 497                     strlen(REG_SECDESC_PREFIX)) == 0)
 498         {
 499                 DEBUG(10, ("regdb_upgrade_v2_to_v3: skipping [%s]\n", keyname));
 500                 return 0;
 501         }
 502
 503         /*
 504          * Found a regular subkey list record.
 505          * Walk the list and create the list record for those
 506          * subkeys that don't already have one.
 507          */
 508         DEBUG(10, ("regdb_upgrade_v2_to_v3: scanning subkey list of [%s]\n",
 509                    keyname));
 510
 511         buf = rec->value.dptr;
 512         buflen = rec->value.dsize;
 513
 514         len = tdb_unpack(buf, buflen, "d", &num_items);
 515         if (len == (uint32_t)-1) {
 516                 /* invalid or empty - skip */
 517                 return 0;
 518         }
 519
 520         for (i=0; i<num_items; i++) {
 521                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
 522                 DEBUG(10, ("regdb_upgrade_v2_to_v3: "
 523                            "writing subkey list for [%s\\%s]\n",
 524                            keyname, subkeyname));
 525                 werr = regdb_store_subkey_list(regdb, keyname, subkeyname);
 526                 if (!W_ERROR_IS_OK(werr)) {
 527                         return 1;
 528                 }
 529         }
 530
 531         return 0;
 532 }
 533
 534 static WERROR regdb_upgrade_v2_to_v3(struct db_context *db)
 535 {
 536         int rc;
 537         WERROR werr;
 538         TALLOC_CTX *frame = talloc_stackframe();
 539
 540         rc = regdb->traverse(db, regdb_upgrade_v2_to_v3_fn, frame);
 541         if (rc < 0) {
 542                 werr = WERR_REG_IO_FAILURE;
 543                 goto done;
 544         }
 545
 546         werr = regdb_store_regdb_version(db, REGVER_V3);
 547
 548 done:
 549         talloc_free(frame);
 550         return werr;
 551 }
 552
 553 /***********************************************************************
 554  Open the registry database
 555  ***********************************************************************/
 556
 557 WERROR regdb_init(void)
 558 {
 559         const char *vstring = "INFO/version";
 560         uint32 vers_id, expected_version;
 561         WERROR werr;
 562
 563         if (regdb) {
 564                 DEBUG(10, ("regdb_init: incrementing refcount (%d->%d)\n",
 565                            regdb_refcount, regdb_refcount+1));
 566                 regdb_refcount++;
 567                 return WERR_OK;
 568         }
 569
 570         regdb = db_open(NULL, state_path("registry.tdb"), 0,
 571                               REG_TDB_FLAGS, O_RDWR, 0600);
 572         if (!regdb) {
 573                 regdb = db_open(NULL, state_path("registry.tdb"), 0,
 574                                       REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
 575                 if (!regdb) {
 576                         werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
 577                         DEBUG(1,("regdb_init: Failed to open registry %s (%s)\n",
 578                                 state_path("registry.tdb"), strerror(errno) ));
 579                         return werr;
 580                 }
 581
 582                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
 583         }
 584
 585         regdb_refcount = 1;
 586         DEBUG(10, ("regdb_init: registry db openend. refcount reset (%d)\n",
 587                    regdb_refcount));
 588
 589         expected_version = REGVER_V3;
 590
 591         vers_id = dbwrap_fetch_int32(regdb, vstring);
 592         if (vers_id == -1) {
 593                 DEBUG(10, ("regdb_init: registry version uninitialized "
 594                            "(got %d), initializing to version %d\n",
 595                            vers_id, expected_version));
 596
 597                 werr = regdb_store_regdb_version(regdb, expected_version);
 598                 return werr;
 599         }
 600
 601         if (vers_id > expected_version || vers_id == 0) {
 602                 DEBUG(1, ("regdb_init: unknown registry version %d "
 603                           "(code version = %d), refusing initialization\n",
 604                           vers_id, expected_version));
 605                 return WERR_CAN_NOT_COMPLETE;
 606         }
 607
 608         if (regdb->transaction_start(regdb) != 0) {
 609                 return WERR_REG_IO_FAILURE;
 610         }
 611
 612         if (vers_id == REGVER_V1) {
 613                 DEBUG(10, ("regdb_init: upgrading registry fromversion %d "
 614                            "to %d\n", REGVER_V1, REGVER_V2));
 615
 616                 werr = regdb_upgrade_v1_to_v2(regdb);
 617                 if (!W_ERROR_IS_OK(werr)) {
 618                         regdb->transaction_cancel(regdb);
 619                         return werr;
 620                 }
 621
 622                 vers_id = REGVER_V2;
 623         }
 624
 625         if (vers_id == REGVER_V2) {
 626                 DEBUG(10, ("regdb_init: upgrading registry from version %d "
 627                            "to %d\n", REGVER_V2, REGVER_V3));
 628
 629                 werr = regdb_upgrade_v2_to_v3(regdb);
 630                 if (!W_ERROR_IS_OK(werr)) {
 631                         regdb->transaction_cancel(regdb);
 632                         return werr;
 633                 }
 634
 635                 vers_id = REGVER_V3;
 636         }
 637
 638         /* future upgrade code should go here */
 639
 640         if (regdb->transaction_commit(regdb) != 0) {
 641                 return WERR_REG_IO_FAILURE;
 642         }
 643
 644         return WERR_OK;
 645 }
 646
 647 /***********************************************************************
 648  Open the registry.  Must already have been initialized by regdb_init()
 649  ***********************************************************************/
 650
 651 WERROR regdb_open( void )
 652 {
 653         WERROR result = WERR_OK;
 654
 655         if ( regdb ) {
 656                 DEBUG(10, ("regdb_open: incrementing refcount (%d->%d)\n",
 657                            regdb_refcount, regdb_refcount+1));
 658                 regdb_refcount++;
 659                 return WERR_OK;
 660         }
 661
 662         become_root();
 663
 664         regdb = db_open(NULL, state_path("registry.tdb"), 0,
 665                               REG_TDB_FLAGS, O_RDWR, 0600);
 666         if ( !regdb ) {
 667                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
 668                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
 669                         state_path("registry.tdb"), strerror(errno) ));
 670         }
 671
 672         unbecome_root();
 673
 674         regdb_refcount = 1;
 675         DEBUG(10, ("regdb_open: registry db opened. refcount reset (%d)\n",
 676                    regdb_refcount));
 677
 678         return result;
 679 }
 680
 681 /***********************************************************************
 682  ***********************************************************************/
 683
 684 int regdb_close( void )
 685 {
 686         if (regdb_refcount == 0) {
 687                 return 0;
 688         }
 689
 690         regdb_refcount--;
 691
 692         DEBUG(10, ("regdb_close: decrementing refcount (%d->%d)\n",
 693                    regdb_refcount+1, regdb_refcount));
 694
 695         if ( regdb_refcount > 0 )
 696                 return 0;
 697
 698         SMB_ASSERT( regdb_refcount >= 0 );
 699
 700         TALLOC_FREE(regdb);
 701         return 0;
 702 }
 703
 704 WERROR regdb_transaction_start(void)
 705 {
 706         return (regdb->transaction_start(regdb) == 0) ?
 707                 WERR_OK : WERR_REG_IO_FAILURE;
 708 }
 709
 710 WERROR regdb_transaction_commit(void)
 711 {
 712         return (regdb->transaction_commit(regdb) == 0) ?
 713                 WERR_OK : WERR_REG_IO_FAILURE;
 714 }
 715
 716 WERROR regdb_transaction_cancel(void)
 717 {
 718         return (regdb->transaction_cancel(regdb) == 0) ?
 719                 WERR_OK : WERR_REG_IO_FAILURE;
 720 }
 721
 722 /***********************************************************************
 723  return the tdb sequence number of the registry tdb.
 724  this is an indicator for the content of the registry
 725  having changed. it will change upon regdb_init, too, though.
 726  ***********************************************************************/
 727 int regdb_get_seqnum(void)
 728 {
 729         return regdb->get_seqnum(regdb);
 730 }
 731
 732
 733 static WERROR regdb_delete_key_with_prefix(struct db_context *db,
 734                                            const char *keyname,
 735                                            const char *prefix)
 736 {
 737         char *path;
 738         WERROR werr = WERR_NOMEM;
 739         TALLOC_CTX *mem_ctx = talloc_stackframe();
 740
 741         if (keyname == NULL) {
 742                 werr = WERR_INVALID_PARAM;
 743                 goto done;
 744         }
 745
 746         if (prefix == NULL) {
 747                 path = discard_const_p(char, keyname);
 748         } else {
 749                 path = talloc_asprintf(mem_ctx, "%s\\%s", prefix, keyname);
 750                 if (path == NULL) {
 751                         goto done;
 752                 }
 753         }
 754
 755         path = normalize_reg_path(mem_ctx, path);
 756         if (path == NULL) {
 757                 goto done;
 758         }
 759
 760         werr = ntstatus_to_werror(dbwrap_delete_bystring(db, path));
 761
 762         /* treat "not found" as ok */
 763         if (W_ERROR_EQUAL(werr, WERR_NOT_FOUND)) {
 764                 werr = WERR_OK;
 765         }
 766
 767 done:
 768         talloc_free(mem_ctx);
 769         return werr;
 770 }
 771
 772
 773 static WERROR regdb_delete_values(struct db_context *db, const char *keyname)
 774 {
 775         return regdb_delete_key_with_prefix(db, keyname, REG_VALUE_PREFIX);
 776 }
 777
 778 static WERROR regdb_delete_secdesc(struct db_context *db, const char *keyname)
 779 {
 780         return regdb_delete_key_with_prefix(db, keyname, REG_SECDESC_PREFIX);
 781 }
 782
 783 static WERROR regdb_delete_subkeylist(struct db_context *db, const char *keyname)
 784 {
 785         return regdb_delete_key_with_prefix(db, keyname, NULL);
 786 }
 787
 788
 789 static WERROR regdb_delete_key_lists(struct db_context *db, const char *keyname)
 790 {
 791         WERROR werr;
 792
 793         werr = regdb_delete_values(db, keyname);
 794         if (!W_ERROR_IS_OK(werr)) {
 795                 DEBUG(1, (__location__ " Deleting %s\\%s failed: %s\n",
 796                           REG_VALUE_PREFIX, keyname, win_errstr(werr)));
 797                 goto done;
 798         }
 799
 800         werr = regdb_delete_secdesc(db, keyname);
 801         if (!W_ERROR_IS_OK(werr)) {
 802                 DEBUG(1, (__location__ " Deleting %s\\%s failed: %s\n",
 803                           REG_SECDESC_PREFIX, keyname, win_errstr(werr)));
 804                 goto done;
 805         }
 806
 807         werr = regdb_delete_subkeylist(db, keyname);
 808         if (!W_ERROR_IS_OK(werr)) {
 809                 DEBUG(1, (__location__ " Deleting %s failed: %s\n",
 810                           keyname, win_errstr(werr)));
 811                 goto done;
 812         }
 813
 814 done:
 815         return werr;
 816 }
 817
 818 /***********************************************************************
 819  Add subkey strings to the registry tdb under a defined key
 820  fmt is the same format as tdb_pack except this function only supports
 821  fstrings
 822  ***********************************************************************/
 823
 824 static WERROR regdb_store_keys_internal2(struct db_context *db,
 825                                          const char *key,
 826                                          struct regsubkey_ctr *ctr)
 827 {
 828         TDB_DATA dbuf;
 829         uint8 *buffer = NULL;
 830         int i = 0;
 831         uint32 len, buflen;
 832         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
 833         char *keyname = NULL;
 834         TALLOC_CTX *ctx = talloc_stackframe();
 835         WERROR werr;
 836
 837         if (!key) {
 838                 werr = WERR_INVALID_PARAM;
 839                 goto done;
 840         }
 841
 842         keyname = talloc_strdup(ctx, key);
 843         if (!keyname) {
 844                 werr = WERR_NOMEM;
 845                 goto done;
 846         }
 847
 848         keyname = normalize_reg_path(ctx, keyname);
 849         if (!keyname) {
 850                 werr = WERR_NOMEM;
 851                 goto done;
 852         }
 853
 854         /* allocate some initial memory */
 855
 856         buffer = (uint8 *)SMB_MALLOC(1024);
 857         if (buffer == NULL) {
 858                 werr = WERR_NOMEM;
 859                 goto done;
 860         }
 861         buflen = 1024;
 862         len = 0;
 863
 864         /* store the number of subkeys */
 865
 866         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
 867
 868         /* pack all the strings */
 869
 870         for (i=0; i<num_subkeys; i++) {
 871                 size_t thistime;
 872
 873                 thistime = tdb_pack(buffer+len, buflen-len, "f",
 874                                     regsubkey_ctr_specific_key(ctr, i));
 875                 if (len+thistime > buflen) {
 876                         size_t thistime2;
 877                         /*
 878                          * tdb_pack hasn't done anything because of the short
 879                          * buffer, allocate extra space.
 880                          */
 881                         buffer = SMB_REALLOC_ARRAY(buffer, uint8_t,
 882                                                    (len+thistime)*2);
 883                         if(buffer == NULL) {
 884                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
 885                                           "memory of size [%u]\n",
 886                                           (unsigned int)(len+thistime)*2));
 887                                 werr = WERR_NOMEM;
 888                                 goto done;
 889                         }
 890                         buflen = (len+thistime)*2;
 891                         thistime2 = tdb_pack(
 892                                 buffer+len, buflen-len, "f",
 893                                 regsubkey_ctr_specific_key(ctr, i));
 894                         if (thistime2 != thistime) {
 895                                 DEBUG(0, ("tdb_pack failed\n"));
 896                                 werr = WERR_CAN_NOT_COMPLETE;
 897                                 goto done;
 898                         }
 899                 }
 900                 len += thistime;
 901         }
 902
 903         /* finally write out the data */
 904
 905         dbuf.dptr = buffer;
 906         dbuf.dsize = len;
 907         werr = ntstatus_to_werror(dbwrap_store_bystring(db, keyname, dbuf,
 908                                                         TDB_REPLACE));
 909
 910 done:
 911         TALLOC_FREE(ctx);
 912         SAFE_FREE(buffer);
 913         return werr;
 914 }
 915
 916 /**
 917  * Utility function to store a new empty list of
 918  * subkeys of given key specified as parent and subkey name
 919  * (thereby creating the key).
 920  * If the parent keyname is NULL, then the "subkey" is
 921  * interpreted as a base key.
 922  * If the subkey list does already exist, it is not modified.
 923  *
 924  * Must be called from within a transaction.
 925  */
 926 static WERROR regdb_store_subkey_list(struct db_context *db, const char *parent,
 927                                       const char *key)
 928 {
 929         WERROR werr;
 930         char *path = NULL;
 931         struct regsubkey_ctr *subkeys = NULL;
 932         TALLOC_CTX *frame = talloc_stackframe();
 933
 934         if (parent == NULL) {
 935                 path = talloc_strdup(frame, key);
 936         } else {
 937                 path = talloc_asprintf(frame, "%s\\%s", parent, key);
 938         }
 939         if (!path) {
 940                 werr = WERR_NOMEM;
 941                 goto done;
 942         }
 943
 944         werr = regsubkey_ctr_init(frame, &subkeys);
 945         W_ERROR_NOT_OK_GOTO_DONE(werr);
 946
 947         werr = regdb_fetch_keys_internal(db, path, subkeys);
 948         if (W_ERROR_IS_OK(werr)) {
 949                 /* subkey list exists already - don't modify */
 950                 goto done;
 951         }
 952
 953         werr = regsubkey_ctr_reinit(subkeys);
 954         W_ERROR_NOT_OK_GOTO_DONE(werr);
 955
 956         /* create a record with 0 subkeys */
 957         werr = regdb_store_keys_internal2(db, path, subkeys);
 958         if (!W_ERROR_IS_OK(werr)) {
 959                 DEBUG(0, ("regdb_store_keys: Failed to store new record for "
 960                           "key [%s]: %s\n", path, win_errstr(werr)));
 961                 goto done;
 962         }
 963
 964 done:
 965         talloc_free(frame);
 966         return werr;
 967 }
 968
 969 /***********************************************************************
 970  Store the new subkey record and create any child key records that
 971  do not currently exist
 972  ***********************************************************************/
 973
 974 struct regdb_store_keys_context {
 975         const char *key;
 976         struct regsubkey_ctr *ctr;
 977 };
 978
 979 static NTSTATUS regdb_store_keys_action(struct db_context *db,
 980                                         void *private_data)
 981 {
 982         struct regdb_store_keys_context *store_ctx;
 983         WERROR werr;
 984         int num_subkeys, i;
 985         char *path = NULL;
 986         struct regsubkey_ctr *old_subkeys = NULL;
 987         char *oldkeyname = NULL;
 988         TALLOC_CTX *mem_ctx = talloc_stackframe();
 989
 990         store_ctx = (struct regdb_store_keys_context *)private_data;
 991
 992         /*
 993          * Re-fetch the old keys inside the transaction
 994          */
 995
 996         werr = regsubkey_ctr_init(mem_ctx, &old_subkeys);
 997         W_ERROR_NOT_OK_GOTO_DONE(werr);
 998
 999         werr = regdb_fetch_keys_internal(db, store_ctx->key, old_subkeys);
1000         if (!W_ERROR_IS_OK(werr) &&
1001             !W_ERROR_EQUAL(werr, WERR_NOT_FOUND))
1002         {
1003                 goto done;
1004         }
1005
1006         /*
1007          * Make the store operation as safe as possible without transactions:
1008          *
1009          * (1) For each subkey removed from ctr compared with old_subkeys:
1010          *
1011          *     (a) First delete the value db entry.
1012          *
1013          *     (b) Next delete the secdesc db record.
1014          *
1015          *     (c) Then delete the subkey list entry.
1016          *
1017          * (2) Now write the list of subkeys of the parent key,
1018          *     deleting removed entries and adding new ones.
1019          *
1020          * (3) Finally create the subkey list entries for the added keys.
1021          *
1022          * This way if we crash half-way in between deleting the subkeys
1023          * and storing the parent's list of subkeys, no old data can pop up
1024          * out of the blue when re-adding keys later on.
1025          */
1026
1027         /* (1) delete removed keys' lists (values/secdesc/subkeys) */
1028
1029         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
1030         for (i=0; i<num_subkeys; i++) {
1031                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
1032
1033                 if (regsubkey_ctr_key_exists(store_ctx->ctr, oldkeyname)) {
1034                         /*
1035                          * It's still around, don't delete
1036                          */
1037                         continue;
1038                 }
1039
1040                 path = talloc_asprintf(mem_ctx, "%s\\%s", store_ctx->key,
1041                                        oldkeyname);
1042                 if (!path) {
1043                         werr = WERR_NOMEM;
1044                         goto done;
1045                 }
1046
1047                 werr = regdb_delete_key_lists(db, path);
1048                 W_ERROR_NOT_OK_GOTO_DONE(werr);
1049
1050                 TALLOC_FREE(path);
1051         }
1052
1053         TALLOC_FREE(old_subkeys);
1054
1055         /* (2) store the subkey list for the parent */
1056
1057         werr = regdb_store_keys_internal2(db, store_ctx->key, store_ctx->ctr);
1058         if (!W_ERROR_IS_OK(werr)) {
1059                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
1060                          "for parent [%s]: %s\n", store_ctx->key,
1061                          win_errstr(werr)));
1062                 goto done;
1063         }
1064
1065         /* (3) now create records for any subkeys that don't already exist */
1066
1067         num_subkeys = regsubkey_ctr_numkeys(store_ctx->ctr);
1068
1069         for (i=0; i<num_subkeys; i++) {
1070                 const char *subkey;
1071
1072                 subkey = regsubkey_ctr_specific_key(store_ctx->ctr, i);
1073
1074                 werr = regdb_store_subkey_list(db, store_ctx->key, subkey);
1075                 W_ERROR_NOT_OK_GOTO_DONE(werr);
1076         }
1077
1078         werr = WERR_OK;
1079
1080 done:
1081         talloc_free(mem_ctx);
1082         return werror_to_ntstatus(werr);
1083 }
1084
1085 static bool regdb_store_keys_internal(struct db_context *db, const char *key,
1086                                       struct regsubkey_ctr *ctr)
1087 {
1088         int num_subkeys, old_num_subkeys, i;
1089         struct regsubkey_ctr *old_subkeys = NULL;
1090         TALLOC_CTX *ctx = talloc_stackframe();
1091         WERROR werr;
1092         bool ret = false;
1093         struct regdb_store_keys_context store_ctx;
1094
1095         if (!regdb_key_exists(db, key)) {
1096                 goto done;
1097         }
1098
1099         /*
1100          * fetch a list of the old subkeys so we can determine if anything has
1101          * changed
1102          */
1103
1104         werr = regsubkey_ctr_init(ctx, &old_subkeys);
1105         if (!W_ERROR_IS_OK(werr)) {
1106                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
1107                 goto done;
1108         }
1109
1110         werr = regdb_fetch_keys_internal(db, key, old_subkeys);
1111         if (!W_ERROR_IS_OK(werr) &&
1112             !W_ERROR_EQUAL(werr, WERR_NOT_FOUND))
1113         {
1114                 goto done;
1115         }
1116
1117         num_subkeys = regsubkey_ctr_numkeys(ctr);
1118         old_num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
1119         if ((num_subkeys && old_num_subkeys) &&
1120             (num_subkeys == old_num_subkeys)) {
1121
1122                 for (i = 0; i < num_subkeys; i++) {
1123                         if (strcmp(regsubkey_ctr_specific_key(ctr, i),
1124                                    regsubkey_ctr_specific_key(old_subkeys, i))
1125                             != 0)
1126                         {
1127                                 break;
1128                         }
1129                 }
1130                 if (i == num_subkeys) {
1131                         /*
1132                          * Nothing changed, no point to even start a tdb
1133                          * transaction
1134                          */
1135
1136                         ret = true;
1137                         goto done;
1138                 }
1139         }
1140
1141         TALLOC_FREE(old_subkeys);
1142
1143         store_ctx.key = key;
1144         store_ctx.ctr = ctr;
1145
1146         werr = ntstatus_to_werror(dbwrap_trans_do(db,
1147                                                   regdb_store_keys_action,
1148                                                   &store_ctx));
1149
1150         ret = W_ERROR_IS_OK(werr);
1151
1152 done:
1153         TALLOC_FREE(ctx);
1154
1155         return ret;
1156 }
1157
1158 bool regdb_store_keys(const char *key, struct regsubkey_ctr *ctr)
1159 {
1160         return regdb_store_keys_internal(regdb, key, ctr);
1161 }
1162
1163 /**
1164  * create a subkey of a given key
1165  */
1166
1167 struct regdb_create_subkey_context {
1168         const char *key;
1169         const char *subkey;
1170 };
1171
1172 static NTSTATUS regdb_create_subkey_action(struct db_context *db,
1173                                            void *private_data)
1174 {
1175         WERROR werr;
1176         struct regdb_create_subkey_context *create_ctx;
1177         struct regsubkey_ctr *subkeys;
1178         TALLOC_CTX *mem_ctx = talloc_stackframe();
1179
1180         create_ctx = (struct regdb_create_subkey_context *)private_data;
1181
1182         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1183         W_ERROR_NOT_OK_GOTO_DONE(werr);
1184
1185         werr = regdb_fetch_keys_internal(db, create_ctx->key, subkeys);
1186         W_ERROR_NOT_OK_GOTO_DONE(werr);
1187
1188         werr = regsubkey_ctr_addkey(subkeys, create_ctx->subkey);
1189         W_ERROR_NOT_OK_GOTO_DONE(werr);
1190
1191         werr = regdb_store_keys_internal2(db, create_ctx->key, subkeys);
1192         if (!W_ERROR_IS_OK(werr)) {
1193                 DEBUG(0, (__location__ " failed to store new subkey list for "
1194                          "parent key %s: %s\n", create_ctx->key,
1195                          win_errstr(werr)));
1196         }
1197
1198         werr = regdb_store_subkey_list(db, create_ctx->key, create_ctx->subkey);
1199
1200 done:
1201         talloc_free(mem_ctx);
1202         return werror_to_ntstatus(werr);
1203 }
1204
1205 static WERROR regdb_create_subkey_internal(struct db_context *db,
1206                                            const char *key,
1207                                            const char *subkey)
1208 {
1209         WERROR werr;
1210         struct regsubkey_ctr *subkeys;
1211         TALLOC_CTX *mem_ctx = talloc_stackframe();
1212         struct regdb_create_subkey_context create_ctx;
1213
1214         if (!regdb_key_exists(db, key)) {
1215                 werr = WERR_NOT_FOUND;
1216                 goto done;
1217         }
1218
1219         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1220         W_ERROR_NOT_OK_GOTO_DONE(werr);
1221
1222         werr = regdb_fetch_keys_internal(db, key, subkeys);
1223         W_ERROR_NOT_OK_GOTO_DONE(werr);
1224
1225         if (regsubkey_ctr_key_exists(subkeys, subkey)) {
1226                 werr = WERR_OK;
1227                 goto done;
1228         }
1229
1230         talloc_free(subkeys);
1231
1232         create_ctx.key = key;
1233         create_ctx.subkey = subkey;
1234
1235         werr = ntstatus_to_werror(dbwrap_trans_do(db,
1236                                                   regdb_create_subkey_action,
1237                                                   &create_ctx));
1238
1239 done:
1240         talloc_free(mem_ctx);
1241         return werr;
1242 }
1243
1244 static WERROR regdb_create_subkey(const char *key, const char *subkey)
1245 {
1246         return regdb_create_subkey_internal(regdb, key, subkey);
1247 }
1248
1249 /**
1250  * create a base key
1251  */
1252
1253 struct regdb_create_basekey_context {
1254         const char *key;
1255 };
1256
1257 static NTSTATUS regdb_create_basekey_action(struct db_context *db,
1258                                             void *private_data)
1259 {
1260         WERROR werr;
1261         struct regdb_create_basekey_context *create_ctx;
1262
1263         create_ctx = (struct regdb_create_basekey_context *)private_data;
1264
1265         werr = regdb_store_subkey_list(db, NULL, create_ctx->key);
1266
1267         return werror_to_ntstatus(werr);
1268 }
1269
1270 static WERROR regdb_create_basekey(struct db_context *db, const char *key)
1271 {
1272         WERROR werr;
1273         struct regdb_create_subkey_context create_ctx;
1274
1275         create_ctx.key = key;
1276
1277         werr = ntstatus_to_werror(dbwrap_trans_do(db,
1278                                                   regdb_create_basekey_action,
1279                                                   &create_ctx));
1280
1281         return werr;
1282 }
1283
1284 /**
1285  * create a subkey of a given key
1286  */
1287
1288 struct regdb_delete_subkey_context {
1289         const char *key;
1290         const char *subkey;
1291         const char *path;
1292         bool lazy;
1293 };
1294
1295 static NTSTATUS regdb_delete_subkey_action(struct db_context *db,
1296                                            void *private_data)
1297 {
1298         WERROR werr;
1299         struct regdb_delete_subkey_context *delete_ctx;
1300         struct regsubkey_ctr *subkeys;
1301         TALLOC_CTX *mem_ctx = talloc_stackframe();
1302
1303         delete_ctx = (struct regdb_delete_subkey_context *)private_data;
1304
1305         werr = regdb_delete_key_lists(db, delete_ctx->path);
1306         W_ERROR_NOT_OK_GOTO_DONE(werr);
1307
1308         if (delete_ctx->lazy) {
1309                 goto done;
1310         }
1311
1312         werr = regsubkey_ctr_init(mem_ctx, &subkeys);
1313         W_ERROR_NOT_OK_GOTO_DONE(werr);
1314
1315         werr = regdb_fetch_keys_internal(db, delete_ctx->key, subkeys);
1316         W_ERROR_NOT_OK_GOTO_DONE(werr);
1317
1318         werr = regsubkey_ctr_delkey(subkeys, delete_ctx->subkey);
1319         W_ERROR_NOT_OK_GOTO_DONE(werr);
1320
1321         werr = regdb_store_keys_internal2(db, delete_ctx->key, subkeys);
1322         if (!W_ERROR_IS_OK(werr)) {
1323                 DEBUG(0, (__location__ " failed to store new subkey_list for "
1324                          "parent key %s: %s\n", delete_ctx->key,
1325                          win_errstr(werr)));
1326         }
1327
1328 done:
1329         talloc_free(mem_ctx);
1330         return werror_to_ntstatus(werr);
1331 }
1332
1333 static WERROR regdb_delete_subkey(const char *key, const char *subkey, bool lazy)
1334 {
1335         WERROR werr;
1336         char *path;
1337         struct regdb_delete_subkey_context delete_ctx;
1338         TALLOC_CTX *mem_ctx = talloc_stackframe();
1339
1340         if (!regdb_key_exists(regdb, key)) {
1341                 werr = WERR_NOT_FOUND;
1342                 goto done;
1343         }
1344
1345         path = talloc_asprintf(mem_ctx, "%s\\%s", key, subkey);
1346         if (path == NULL) {
1347                 werr = WERR_NOMEM;
1348                 goto done;
1349         }
1350
1351         if (!regdb_key_exists(regdb, path)) {
1352                 werr = WERR_OK;
1353                 goto done;
1354         }
1355
1356         delete_ctx.key = key;
1357         delete_ctx.subkey = subkey;
1358         delete_ctx.path = path;
1359         delete_ctx.lazy = lazy;
1360
1361         werr = ntstatus_to_werror(dbwrap_trans_do(regdb,
1362                                                   regdb_delete_subkey_action,
1363                                                   &delete_ctx));
1364
1365 done:
1366         talloc_free(mem_ctx);
1367         return werr;
1368 }
1369
1370 static TDB_DATA regdb_fetch_key_internal(struct db_context *db,
1371                                          TALLOC_CTX *mem_ctx, const char *key)
1372 {
1373         char *path = NULL;
1374         TDB_DATA data;
1375
1376         path = normalize_reg_path(mem_ctx, key);
1377         if (!path) {
1378                 return make_tdb_data(NULL, 0);
1379         }
1380
1381         data = dbwrap_fetch_bystring(db, mem_ctx, path);
1382
1383         TALLOC_FREE(path);
1384         return data;
1385 }
1386
1387
1388 /**
1389  * Check for the existence of a key.
1390  *
1391  * Existence of a key is authoritatively defined by
1392  * the existence of the record that contains the list
1393  * of its subkeys.
1394  *
1395  * Return false, if the record does not match the correct
1396  * structure of an initial 4-byte counter and then a
1397  * list of the corresponding number of zero-terminated
1398  * strings.
1399  */
1400 static bool regdb_key_exists(struct db_context *db, const char *key)
1401 {
1402         TALLOC_CTX *mem_ctx = talloc_stackframe();
1403         TDB_DATA value;
1404         bool ret = false;
1405         char *path;
1406         uint32_t buflen;
1407         const char *buf;
1408         uint32_t num_items, i;
1409         int32_t len;
1410
1411         if (key == NULL) {
1412                 goto done;
1413         }
1414
1415         path = normalize_reg_path(mem_ctx, key);
1416         if (path == NULL) {
1417                 DEBUG(0, ("out of memory! (talloc failed)\n"));
1418                 goto done;
1419         }
1420
1421         if (*path == '\0') {
1422                 goto done;
1423         }
1424
1425         value = regdb_fetch_key_internal(db, mem_ctx, path);
1426         if (value.dptr == NULL) {
1427                 goto done;
1428         }
1429
1430         if (value.dsize == 0) {
1431                 DEBUG(10, ("regdb_key_exists: subkeylist-record for key "
1432                           "[%s] is empty: Could be a deleted record in a "
1433                           "clustered (ctdb) environment?\n",
1434                           path));
1435                 goto done;
1436         }
1437
1438         len = tdb_unpack(value.dptr, value.dsize, "d", &num_items);
1439         if (len == (int32_t)-1) {
1440                 DEBUG(1, ("regdb_key_exists: ERROR: subkeylist-record for key "
1441                           "[%s] is invalid: Could not parse initial 4-byte "
1442                           "counter. record data length is %u.\n",
1443                           path, (unsigned int)value.dsize));
1444                 goto done;
1445         }
1446
1447         /*
1448          * Note: the tdb_unpack check above implies that len <= value.dsize
1449          */
1450         buflen = value.dsize - len;
1451         buf = (const char *)value.dptr + len;
1452
1453         len = 0;
1454
1455         for (i = 0; i < num_items; i++) {
1456                 if (buflen == 0) {
1457                         break;
1458                 }
1459                 len = strnlen(buf, buflen) + 1;
1460                 if (buflen < len) {
1461                         DEBUG(1, ("regdb_key_exists: ERROR: subkeylist-record "
1462                                   "for key [%s] is corrupt: %u items expected, "
1463                                   "item number %u is not zero terminated.\n",
1464                                   path, num_items, i+1));
1465                         goto done;
1466                 }
1467
1468                 buf += len;
1469                 buflen -= len;
1470         }
1471
1472         if (buflen > 0) {
1473                 DEBUG(1, ("regdb_key_exists: ERROR: subkeylist-record for key "
1474                           "[%s] is corrupt: %u items expected and found, but "
1475                           "the record contains additional %u bytes\n",
1476                           path, num_items, buflen));
1477                 goto done;
1478         }
1479
1480         if (i < num_items) {
1481                 DEBUG(1, ("regdb_key_exists: ERROR: subkeylist-record for key "
1482                           "[%s] is corrupt: %u items expected, but only %u "
1483                           "items found.\n",
1484                           path, num_items, i+1));
1485                 goto done;
1486         }
1487
1488         ret = true;
1489
1490 done:
1491         TALLOC_FREE(mem_ctx);
1492         return ret;
1493 }
1494
1495
1496 /***********************************************************************
1497  Retrieve an array of strings containing subkeys.  Memory should be
1498  released by the caller.
1499  ***********************************************************************/
1500
1501 static WERROR regdb_fetch_keys_internal(struct db_context *db, const char *key,
1502                                         struct regsubkey_ctr *ctr)
1503 {
1504         WERROR werr;
1505         uint32_t num_items;
1506         uint8 *buf;
1507         uint32 buflen, len;
1508         int i;
1509         fstring subkeyname;
1510         TALLOC_CTX *frame = talloc_stackframe();
1511         TDB_DATA value;
1512
1513         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
1514
1515         if (!regdb_key_exists(db, key)) {
1516                 DEBUG(10, ("key [%s] not found\n", key));
1517                 werr = WERR_NOT_FOUND;
1518                 goto done;
1519         }
1520
1521         werr = regsubkey_ctr_reinit(ctr);
1522         W_ERROR_NOT_OK_GOTO_DONE(werr);
1523
1524         werr = regsubkey_ctr_set_seqnum(ctr, db->get_seqnum(db));
1525         W_ERROR_NOT_OK_GOTO_DONE(werr);
1526
1527         value = regdb_fetch_key_internal(db, frame, key);
1528
1529         if (value.dsize == 0 || value.dptr == NULL) {
1530                 DEBUG(10, ("regdb_fetch_keys: no subkeys found for key [%s]\n",
1531                            key));
1532                 goto done;
1533         }
1534
1535         buf = value.dptr;
1536         buflen = value.dsize;
1537         len = tdb_unpack( buf, buflen, "d", &num_items);
1538         if (len == (uint32_t)-1) {
1539                 werr = WERR_NOT_FOUND;
1540                 goto done;
1541         }
1542
1543         for (i=0; i<num_items; i++) {
1544                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
1545                 werr = regsubkey_ctr_addkey(ctr, subkeyname);
1546                 if (!W_ERROR_IS_OK(werr)) {
1547                         DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
1548                                   "failed: %s\n", win_errstr(werr)));
1549                         num_items = 0;
1550                         goto done;
1551                 }
1552         }
1553
1554         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
1555
1556 done:
1557         TALLOC_FREE(frame);
1558         return werr;
1559 }
1560
1561 int regdb_fetch_keys(const char *key, struct regsubkey_ctr *ctr)
1562 {
1563         WERROR werr;
1564
1565         werr = regdb_fetch_keys_internal(regdb, key, ctr);
1566         if (!W_ERROR_IS_OK(werr)) {
1567                 return -1;
1568         }
1569
1570         return regsubkey_ctr_numkeys(ctr);
1571 }
1572
1573 /****************************************************************************
1574  Unpack a list of registry values frem the TDB
1575  ***************************************************************************/
1576
1577 static int regdb_unpack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1578 {
1579         int             len = 0;
1580         uint32          type;
1581         fstring valuename;
1582         uint32          size;
1583         uint8           *data_p;
1584         uint32          num_values = 0;
1585         int             i;
1586
1587         /* loop and unpack the rest of the registry values */
1588
1589         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
1590
1591         for ( i=0; i<num_values; i++ ) {
1592                 /* unpack the next regval */
1593
1594                 type = REG_NONE;
1595                 size = 0;
1596                 data_p = NULL;
1597                 valuename[0] = '\0';
1598                 len += tdb_unpack(buf+len, buflen-len, "fdB",
1599                                   valuename,
1600                                   &type,
1601                                   &size,
1602                                   &data_p);
1603
1604                 regval_ctr_addvalue(values, valuename, type,
1605                                 (uint8_t *)data_p, size);
1606                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
1607
1608                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
1609         }
1610
1611         return len;
1612 }
1613
1614 /****************************************************************************
1615  Pack all values in all printer keys
1616  ***************************************************************************/
1617
1618 static int regdb_pack_values(struct regval_ctr *values, uint8 *buf, int buflen)
1619 {
1620         int             len = 0;
1621         int             i;
1622         struct regval_blob      *val;
1623         int             num_values;
1624
1625         if ( !values )
1626                 return 0;
1627
1628         num_values = regval_ctr_numvals( values );
1629
1630         /* pack the number of values first */
1631
1632         len += tdb_pack( buf+len, buflen-len, "d", num_values );
1633
1634         /* loop over all values */
1635
1636         for ( i=0; i<num_values; i++ ) {
1637                 val = regval_ctr_specific_value( values, i );
1638                 len += tdb_pack(buf+len, buflen-len, "fdB",
1639                                 regval_name(val),
1640                                 regval_type(val),
1641                                 regval_size(val),
1642                                 regval_data_p(val) );
1643         }
1644
1645         return len;
1646 }
1647
1648 /***********************************************************************
1649  Retrieve an array of strings containing subkeys.  Memory should be
1650  released by the caller.
1651  ***********************************************************************/
1652
1653 static int regdb_fetch_values_internal(struct db_context *db, const char* key,
1654                                        struct regval_ctr *values)
1655 {
1656         char *keystr = NULL;
1657         TALLOC_CTX *ctx = talloc_stackframe();
1658         int ret = 0;
1659         TDB_DATA value;
1660         WERROR werr;
1661
1662         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
1663
1664         if (!regdb_key_exists(db, key)) {
1665                 goto done;
1666         }
1667
1668         keystr = talloc_asprintf(ctx, "%s\\%s", REG_VALUE_PREFIX, key);
1669         if (!keystr) {
1670                 goto done;
1671         }
1672
1673         werr = regval_ctr_set_seqnum(values, db->get_seqnum(db));
1674         W_ERROR_NOT_OK_GOTO_DONE(werr);
1675
1676         value = regdb_fetch_key_internal(db, ctx, keystr);
1677
1678         if (!value.dptr) {
1679                 /* all keys have zero values by default */
1680                 goto done;
1681         }
1682
1683         regdb_unpack_values(values, value.dptr, value.dsize);
1684         ret = regval_ctr_numvals(values);
1685
1686 done:
1687         TALLOC_FREE(ctx);
1688         return ret;
1689 }
1690
1691 int regdb_fetch_values(const char* key, struct regval_ctr *values)
1692 {
1693         return regdb_fetch_values_internal(regdb, key, values);
1694 }
1695
1696 static bool regdb_store_values_internal(struct db_context *db, const char *key,
1697                                         struct regval_ctr *values)
1698 {
1699         TDB_DATA old_data, data;
1700         char *keystr = NULL;
1701         TALLOC_CTX *ctx = talloc_stackframe();
1702         int len;
1703         NTSTATUS status;
1704         bool result = false;
1705
1706         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
1707
1708         if (!regdb_key_exists(db, key)) {
1709                 goto done;
1710         }
1711
1712         ZERO_STRUCT(data);
1713
1714         len = regdb_pack_values(values, data.dptr, data.dsize);
1715         if (len <= 0) {
1716                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
1717                 goto done;
1718         }
1719
1720         data.dptr = talloc_array(ctx, uint8, len);
1721         data.dsize = len;
1722
1723         len = regdb_pack_values(values, data.dptr, data.dsize);
1724
1725         SMB_ASSERT( len == data.dsize );
1726
1727         keystr = talloc_asprintf(ctx, "%s\\%s", REG_VALUE_PREFIX, key );
1728         if (!keystr) {
1729                 goto done;
1730         }
1731         keystr = normalize_reg_path(ctx, keystr);
1732         if (!keystr) {
1733                 goto done;
1734         }
1735
1736         old_data = dbwrap_fetch_bystring(db, ctx, keystr);
1737
1738         if ((old_data.dptr != NULL)
1739             && (old_data.dsize == data.dsize)
1740             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
1741         {
1742                 result = true;
1743                 goto done;
1744         }
1745
1746         status = dbwrap_trans_store_bystring(db, keystr, data, TDB_REPLACE);
1747
1748         result = NT_STATUS_IS_OK(status);
1749
1750 done:
1751         TALLOC_FREE(ctx);
1752         return result;
1753 }
1754
1755 bool regdb_store_values(const char *key, struct regval_ctr *values)
1756 {
1757         return regdb_store_values_internal(regdb, key, values);
1758 }
1759
1760 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
1761                                 struct security_descriptor **psecdesc)
1762 {
1763         char *tdbkey;
1764         TDB_DATA data;
1765         NTSTATUS status;
1766         TALLOC_CTX *tmp_ctx = talloc_stackframe();
1767         WERROR err = WERR_OK;
1768
1769         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
1770
1771         if (!regdb_key_exists(regdb, key)) {
1772                 err = WERR_BADFILE;
1773                 goto done;
1774         }
1775
1776         tdbkey = talloc_asprintf(tmp_ctx, "%s\\%s", REG_SECDESC_PREFIX, key);
1777         if (tdbkey == NULL) {
1778                 err = WERR_NOMEM;
1779                 goto done;
1780         }
1781
1782         tdbkey = normalize_reg_path(tmp_ctx, tdbkey);
1783         if (tdbkey == NULL) {
1784                 err = WERR_NOMEM;
1785                 goto done;
1786         }
1787
1788         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
1789         if (data.dptr == NULL) {
1790                 err = WERR_BADFILE;
1791                 goto done;
1792         }
1793
1794         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
1795                                      psecdesc);
1796
1797         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
1798                 err = WERR_NOMEM;
1799         } else if (!NT_STATUS_IS_OK(status)) {
1800                 err = WERR_REG_CORRUPT;
1801         }
1802
1803 done:
1804         TALLOC_FREE(tmp_ctx);
1805         return err;
1806 }
1807
1808 static WERROR regdb_set_secdesc(const char *key,
1809                                 struct security_descriptor *secdesc)
1810 {
1811         TALLOC_CTX *mem_ctx = talloc_stackframe();
1812         char *tdbkey;
1813         WERROR err = WERR_NOMEM;
1814         TDB_DATA tdbdata;
1815
1816         if (!regdb_key_exists(regdb, key)) {
1817                 err = WERR_BADFILE;
1818                 goto done;
1819         }
1820
1821         tdbkey = talloc_asprintf(mem_ctx, "%s\\%s", REG_SECDESC_PREFIX, key);
1822         if (tdbkey == NULL) {
1823                 goto done;
1824         }
1825
1826         tdbkey = normalize_reg_path(mem_ctx, tdbkey);
1827         if (tdbkey == NULL) {
1828                 err = WERR_NOMEM;
1829                 goto done;
1830         }
1831
1832         if (secdesc == NULL) {
1833                 /* assuming a delete */
1834                 err = ntstatus_to_werror(dbwrap_trans_delete_bystring(regdb,
1835                                                                       tdbkey));
1836                 goto done;
1837         }
1838
1839         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1840                                                    &tdbdata.dptr,
1841                                                    &tdbdata.dsize));
1842         W_ERROR_NOT_OK_GOTO_DONE(err);
1843
1844         err = ntstatus_to_werror(dbwrap_trans_store_bystring(regdb, tdbkey,
1845                                                              tdbdata, 0));
1846
1847  done:
1848         TALLOC_FREE(mem_ctx);
1849         return err;
1850 }
1851
1852 bool regdb_subkeys_need_update(struct regsubkey_ctr *subkeys)
1853 {
1854         return (regdb_get_seqnum() != regsubkey_ctr_get_seqnum(subkeys));
1855 }
1856
1857 bool regdb_values_need_update(struct regval_ctr *values)
1858 {
1859         return (regdb_get_seqnum() != regval_ctr_get_seqnum(values));
1860 }
1861
1862 /*
1863  * Table of function pointers for default access
1864  */
1865
1866 struct registry_ops regdb_ops = {
1867         .fetch_subkeys = regdb_fetch_keys,
1868         .fetch_values = regdb_fetch_values,
1869         .store_subkeys = regdb_store_keys,
1870         .store_values = regdb_store_values,
1871         .create_subkey = regdb_create_subkey,
1872         .delete_subkey = regdb_delete_subkey,
1873         .get_secdesc = regdb_get_secdesc,
1874         .set_secdesc = regdb_set_secdesc,
1875         .subkeys_need_update = regdb_subkeys_need_update,
1876         .values_need_update = regdb_values_need_update
1877 };