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