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->transaction_start(regdb) != 0) {
 205                 DEBUG(0, ("init_registry_key: transaction_start failed\n"));
 206                 return WERR_REG_IO_FAILURE;
 207         }
 208
 209         werr = init_registry_key_internal(add_path);
 210         if (!W_ERROR_IS_OK(werr)) {
 211                 goto fail;
 212         }
 213
 214         if (regdb->transaction_commit(regdb) != 0) {
 215                 DEBUG(0, ("init_registry_key: Could not commit transaction\n"));
 216                 return WERR_REG_IO_FAILURE;
 217         }
 218
 219         return WERR_OK;
 220
 221 fail:
 222         if (regdb->transaction_cancel(regdb) != 0) {
 223                 smb_panic("init_registry_key: transaction_cancel failed\n");
 224         }
 225
 226         return werr;
 227 }
 228
 229 /***********************************************************************
 230  Open the registry data in the tdb
 231  ***********************************************************************/
 232
 233 WERROR init_registry_data(void)
 234 {
 235         WERROR werr;
 236         TALLOC_CTX *frame = NULL;
 237         REGVAL_CTR *values;
 238         int i;
 239         UNISTR2 data;
 240
 241         /*
 242          * There are potentially quite a few store operations which are all
 243          * indiviually wrapped in tdb transactions. Wrapping them in a single
 244          * transaction gives just a single transaction_commit() to actually do
 245          * its fsync()s. See tdb/common/transaction.c for info about nested
 246          * transaction behaviour.
 247          */
 248
 249         if (regdb->transaction_start(regdb) != 0) {
 250                 DEBUG(0, ("init_registry_data: tdb_transaction_start "
 251                           "failed\n"));
 252                 return WERR_REG_IO_FAILURE;
 253         }
 254
 255         /* loop over all of the predefined paths and add each component */
 256
 257         for (i=0; builtin_registry_paths[i] != NULL; i++) {
 258                 werr = init_registry_key_internal(builtin_registry_paths[i]);
 259                 if (!W_ERROR_IS_OK(werr)) {
 260                         goto fail;
 261                 }
 262         }
 263
 264         /* loop over all of the predefined values and add each component */
 265
 266         frame = talloc_stackframe();
 267
 268         for (i=0; builtin_registry_values[i].path != NULL; i++) {
 269
 270                 values = TALLOC_ZERO_P(frame, REGVAL_CTR);
 271                 if (values == NULL) {
 272                         werr = WERR_NOMEM;
 273                         goto fail;
 274                 }
 275
 276                 regdb_fetch_values(builtin_registry_values[i].path, values);
 277
 278                 /* preserve existing values across restarts. Only add new ones */
 279
 280                 if (!regval_ctr_key_exists(values,
 281                                         builtin_registry_values[i].valuename))
 282                 {
 283                         switch(builtin_registry_values[i].type) {
 284                         case REG_DWORD:
 285                                 regval_ctr_addvalue(values,
 286                                         builtin_registry_values[i].valuename,
 287                                         REG_DWORD,
 288                                         (char*)&builtin_registry_values[i].data.dw_value,
 289                                         sizeof(uint32));
 290                                 break;
 291
 292                         case REG_SZ:
 293                                 init_unistr2(&data,
 294                                         builtin_registry_values[i].data.string,
 295                                         UNI_STR_TERMINATE);
 296                                 regval_ctr_addvalue(values,
 297                                         builtin_registry_values[i].valuename,
 298                                         REG_SZ,
 299                                         (char*)data.buffer,
 300                                         data.uni_str_len*sizeof(uint16));
 301                                 break;
 302
 303                         default:
 304                                 DEBUG(0, ("init_registry_data: invalid value "
 305                                           "type in builtin_registry_values "
 306                                           "[%d]\n",
 307                                           builtin_registry_values[i].type));
 308                         }
 309                         regdb_store_values(builtin_registry_values[i].path,
 310                                            values);
 311                 }
 312                 TALLOC_FREE(values);
 313         }
 314
 315         TALLOC_FREE(frame);
 316
 317         if (regdb->transaction_commit(regdb) != 0) {
 318                 DEBUG(0, ("init_registry_data: Could not commit "
 319                           "transaction\n"));
 320                 return WERR_REG_IO_FAILURE;
 321         }
 322
 323         return WERR_OK;
 324
 325  fail:
 326
 327         TALLOC_FREE(frame);
 328
 329         if (regdb->transaction_cancel(regdb) != 0) {
 330                 smb_panic("init_registry_data: tdb_transaction_cancel "
 331                           "failed\n");
 332         }
 333
 334         return werr;
 335 }
 336
 337 /***********************************************************************
 338  Open the registry database
 339  ***********************************************************************/
 340
 341 WERROR regdb_init(void)
 342 {
 343         const char *vstring = "INFO/version";
 344         uint32 vers_id;
 345         WERROR werr;
 346
 347         if (regdb) {
 348                 DEBUG(10, ("regdb_init: incrementing refcount (%d)\n",
 349                           regdb_refcount));
 350                 regdb_refcount++;
 351                 return WERR_OK;
 352         }
 353
 354         regdb = db_open_trans(NULL, state_path("registry.tdb"), 0,
 355                               REG_TDB_FLAGS, O_RDWR, 0600);
 356         if (!regdb) {
 357                 regdb = db_open_trans(NULL, state_path("registry.tdb"), 0,
 358                                       REG_TDB_FLAGS, O_RDWR|O_CREAT, 0600);
 359                 if (!regdb) {
 360                         werr = ntstatus_to_werror(map_nt_error_from_unix(errno));
 361                         DEBUG(0,("regdb_init: Failed to open registry %s (%s)\n",
 362                                 state_path("registry.tdb"), strerror(errno) ));
 363                         return werr;
 364                 }
 365
 366                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
 367         }
 368
 369         regdb_refcount = 1;
 370
 371         vers_id = dbwrap_fetch_int32(regdb, vstring);
 372
 373         if ( vers_id != REGVER_V1 ) {
 374                 NTSTATUS status;
 375                 /* any upgrade code here if needed */
 376                 DEBUG(10, ("regdb_init: got %s = %d != %d\n", vstring,
 377                            vers_id, REGVER_V1));
 378                 status = dbwrap_trans_store_int32(regdb, vstring, REGVER_V1);
 379                 if (!NT_STATUS_IS_OK(status)) {
 380                         DEBUG(0, ("regdb_init: error storing %s = %d: %s\n",
 381                                   vstring, REGVER_V1, nt_errstr(status)));
 382                         return ntstatus_to_werror(status);
 383                 } else {
 384                         DEBUG(10, ("regdb_init: stored %s = %d\n",
 385                                   vstring, REGVER_V1));
 386                 }
 387         }
 388
 389         return WERR_OK;
 390 }
 391
 392 /***********************************************************************
 393  Open the registry.  Must already have been initialized by regdb_init()
 394  ***********************************************************************/
 395
 396 WERROR regdb_open( void )
 397 {
 398         WERROR result = WERR_OK;
 399
 400         if ( regdb ) {
 401                 DEBUG(10,("regdb_open: incrementing refcount (%d)\n", regdb_refcount));
 402                 regdb_refcount++;
 403                 return WERR_OK;
 404         }
 405
 406         become_root();
 407
 408         regdb = db_open_trans(NULL, state_path("registry.tdb"), 0,
 409                               REG_TDB_FLAGS, O_RDWR, 0600);
 410         if ( !regdb ) {
 411                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
 412                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
 413                         state_path("registry.tdb"), strerror(errno) ));
 414         }
 415
 416         unbecome_root();
 417
 418         regdb_refcount = 1;
 419         DEBUG(10,("regdb_open: refcount reset (%d)\n", regdb_refcount));
 420
 421         return result;
 422 }
 423
 424 /***********************************************************************
 425  ***********************************************************************/
 426
 427 int regdb_close( void )
 428 {
 429         if (regdb_refcount == 0) {
 430                 return 0;
 431         }
 432
 433         regdb_refcount--;
 434
 435         DEBUG(10,("regdb_close: decrementing refcount (%d)\n", regdb_refcount));
 436
 437         if ( regdb_refcount > 0 )
 438                 return 0;
 439
 440         SMB_ASSERT( regdb_refcount >= 0 );
 441
 442         TALLOC_FREE(regdb);
 443         return 0;
 444 }
 445
 446 /***********************************************************************
 447  return the tdb sequence number of the registry tdb.
 448  this is an indicator for the content of the registry
 449  having changed. it will change upon regdb_init, too, though.
 450  ***********************************************************************/
 451 int regdb_get_seqnum(void)
 452 {
 453         return regdb->get_seqnum(regdb);
 454 }
 455
 456 /***********************************************************************
 457  Add subkey strings to the registry tdb under a defined key
 458  fmt is the same format as tdb_pack except this function only supports
 459  fstrings
 460  ***********************************************************************/
 461
 462 static bool regdb_store_keys_internal(const char *key, REGSUBKEY_CTR *ctr)
 463 {
 464         TDB_DATA dbuf;
 465         uint8 *buffer = NULL;
 466         int i = 0;
 467         uint32 len, buflen;
 468         bool ret = true;
 469         uint32 num_subkeys = regsubkey_ctr_numkeys(ctr);
 470         char *keyname = NULL;
 471         TALLOC_CTX *ctx = talloc_stackframe();
 472         NTSTATUS status;
 473
 474         if (!key) {
 475                 return false;
 476         }
 477
 478         keyname = talloc_strdup(ctx, key);
 479         if (!keyname) {
 480                 return false;
 481         }
 482         keyname = normalize_reg_path(ctx, keyname);
 483
 484         /* allocate some initial memory */
 485
 486         buffer = (uint8 *)SMB_MALLOC(1024);
 487         if (buffer == NULL) {
 488                 return false;
 489         }
 490         buflen = 1024;
 491         len = 0;
 492
 493         /* store the number of subkeys */
 494
 495         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys);
 496
 497         /* pack all the strings */
 498
 499         for (i=0; i<num_subkeys; i++) {
 500                 len += tdb_pack(buffer+len, buflen-len, "f",
 501                                 regsubkey_ctr_specific_key(ctr, i));
 502                 if (len > buflen) {
 503                         /* allocate some extra space */
 504                         buffer = (uint8 *)SMB_REALLOC(buffer, len*2);
 505                         if(buffer == NULL) {
 506                                 DEBUG(0, ("regdb_store_keys: Failed to realloc "
 507                                           "memory of size [%d]\n", len*2));
 508                                 ret = false;
 509                                 goto done;
 510                         }
 511                         buflen = len*2;
 512                         len = tdb_pack(buffer+len, buflen-len, "f",
 513                                        regsubkey_ctr_specific_key(ctr, i));
 514                 }
 515         }
 516
 517         /* finally write out the data */
 518
 519         dbuf.dptr = buffer;
 520         dbuf.dsize = len;
 521         status = dbwrap_store_bystring(regdb, keyname, dbuf, TDB_REPLACE);
 522         if (!NT_STATUS_IS_OK(status)) {
 523                 ret = false;
 524                 goto done;
 525         }
 526
 527 done:
 528         TALLOC_FREE(ctx);
 529         SAFE_FREE(buffer);
 530         return ret;
 531 }
 532
 533 /***********************************************************************
 534  Store the new subkey record and create any child key records that
 535  do not currently exist
 536  ***********************************************************************/
 537
 538 bool regdb_store_keys(const char *key, REGSUBKEY_CTR *ctr)
 539 {
 540         int num_subkeys, i;
 541         char *path = NULL;
 542         REGSUBKEY_CTR *subkeys = NULL, *old_subkeys = NULL;
 543         char *oldkeyname = NULL;
 544         TALLOC_CTX *ctx = talloc_stackframe();
 545         NTSTATUS status;
 546
 547         /*
 548          * fetch a list of the old subkeys so we can determine if anything has
 549          * changed
 550          */
 551
 552         if (!(old_subkeys = TALLOC_ZERO_P(ctx, REGSUBKEY_CTR))) {
 553                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 554                 return false;
 555         }
 556
 557         regdb_fetch_keys(key, old_subkeys);
 558
 559         if ((ctr->num_subkeys && old_subkeys->num_subkeys) &&
 560             (ctr->num_subkeys == old_subkeys->num_subkeys)) {
 561
 562                 for (i = 0; i<ctr->num_subkeys; i++) {
 563                         if (strcmp(ctr->subkeys[i],
 564                                    old_subkeys->subkeys[i]) != 0) {
 565                                 break;
 566                         }
 567                 }
 568                 if (i == ctr->num_subkeys) {
 569                         /*
 570                          * Nothing changed, no point to even start a tdb
 571                          * transaction
 572                          */
 573                         TALLOC_FREE(old_subkeys);
 574                         return true;
 575                 }
 576         }
 577
 578         TALLOC_FREE(old_subkeys);
 579
 580         if (regdb->transaction_start(regdb) != 0) {
 581                 DEBUG(0, ("regdb_store_keys: transaction_start failed\n"));
 582                 goto fail;
 583         }
 584
 585         /*
 586          * Re-fetch the old keys inside the transaction
 587          */
 588
 589         if (!(old_subkeys = TALLOC_ZERO_P(ctx, REGSUBKEY_CTR))) {
 590                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 591                 goto cancel;
 592         }
 593
 594         regdb_fetch_keys(key, old_subkeys);
 595
 596         /* store the subkey list for the parent */
 597
 598         if (!regdb_store_keys_internal(key, ctr) ) {
 599                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list "
 600                          "for parent [%s]\n", key));
 601                 goto cancel;
 602         }
 603
 604         /* now delete removed keys */
 605
 606         num_subkeys = regsubkey_ctr_numkeys(old_subkeys);
 607         for (i=0; i<num_subkeys; i++) {
 608                 oldkeyname = regsubkey_ctr_specific_key(old_subkeys, i);
 609
 610                 if (regsubkey_ctr_key_exists(ctr, oldkeyname)) {
 611                         /*
 612                          * It's still around, don't delete
 613                          */
 614
 615                         continue;
 616                 }
 617
 618                 path = talloc_asprintf(ctx, "%s/%s", key, oldkeyname);
 619                 if (!path) {
 620                         goto cancel;
 621                 }
 622                 path = normalize_reg_path(ctx, path);
 623                 if (!path) {
 624                         goto cancel;
 625                 }
 626                 status = dbwrap_delete_bystring(regdb, path);
 627                 if (!NT_STATUS_IS_OK(status)) {
 628                         DEBUG(1, ("Deleting %s failed\n", path));
 629                         goto cancel;
 630                 }
 631
 632                 TALLOC_FREE(path);
 633                 path = talloc_asprintf(ctx, "%s/%s/%s",
 634                                 REG_VALUE_PREFIX,
 635                                 key,
 636                                 oldkeyname );
 637                 if (!path) {
 638                         goto cancel;
 639                 }
 640                 path = normalize_reg_path(ctx, path);
 641                 if (!path) {
 642                         goto cancel;
 643                 }
 644
 645                 /*
 646                  * Ignore errors here, we might have no values around
 647                  */
 648                 dbwrap_delete_bystring(regdb, path);
 649                 TALLOC_FREE(path);
 650         }
 651
 652         TALLOC_FREE(old_subkeys);
 653
 654         /* now create records for any subkeys that don't already exist */
 655
 656         num_subkeys = regsubkey_ctr_numkeys(ctr);
 657
 658         if (num_subkeys == 0) {
 659                 if (!(subkeys = TALLOC_ZERO_P(ctx, REGSUBKEY_CTR)) ) {
 660                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 661                         goto cancel;
 662                 }
 663
 664                 if (!regdb_store_keys_internal(key, subkeys)) {
 665                         DEBUG(0,("regdb_store_keys: Failed to store "
 666                                  "new record for key [%s]\n", key));
 667                         goto cancel;
 668                 }
 669                 TALLOC_FREE(subkeys);
 670
 671         }
 672
 673         for (i=0; i<num_subkeys; i++) {
 674                 path = talloc_asprintf(ctx, "%s/%s",
 675                                         key,
 676                                         regsubkey_ctr_specific_key(ctr, i));
 677                 if (!path) {
 678                         goto cancel;
 679                 }
 680                 if (!(subkeys = TALLOC_ZERO_P(ctx, REGSUBKEY_CTR)) ) {
 681                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 682                         goto cancel;
 683                 }
 684
 685                 if (regdb_fetch_keys( path, subkeys ) == -1) {
 686                         /* create a record with 0 subkeys */
 687                         if (!regdb_store_keys_internal(path, subkeys)) {
 688                                 DEBUG(0,("regdb_store_keys: Failed to store "
 689                                          "new record for key [%s]\n", path));
 690                                 goto cancel;
 691                         }
 692                 }
 693
 694                 TALLOC_FREE(subkeys);
 695                 TALLOC_FREE(path);
 696         }
 697
 698         if (regdb->transaction_commit(regdb) != 0) {
 699                 DEBUG(0, ("regdb_store_keys: Could not commit transaction\n"));
 700                 goto fail;
 701         }
 702
 703         TALLOC_FREE(ctx);
 704         return true;
 705
 706 cancel:
 707         if (regdb->transaction_cancel(regdb) != 0) {
 708                 smb_panic("regdb_store_keys: transaction_cancel failed\n");
 709         }
 710
 711 fail:
 712         TALLOC_FREE(ctx);
 713
 714         return false;
 715 }
 716
 717
 718 static TDB_DATA regdb_fetch_key_internal(const char *key, TALLOC_CTX *mem_ctx)
 719 {
 720         char *path = NULL;
 721
 722         path = normalize_reg_path(mem_ctx, key);
 723         if (!path) {
 724                 return make_tdb_data(NULL, 0);
 725         }
 726
 727         return dbwrap_fetch_bystring(regdb, mem_ctx, path);
 728 }
 729
 730
 731 static bool regdb_key_exists(const char *key)
 732 {
 733         TALLOC_CTX *mem_ctx = talloc_stackframe();
 734         TDB_DATA value;
 735         bool ret;
 736
 737         value = regdb_fetch_key_internal(key, mem_ctx);
 738         ret = (value.dptr != NULL);
 739
 740         TALLOC_FREE(mem_ctx);
 741         return ret;
 742 }
 743
 744
 745 /***********************************************************************
 746  Retrieve an array of strings containing subkeys.  Memory should be
 747  released by the caller.
 748  ***********************************************************************/
 749
 750 int regdb_fetch_keys(const char *key, REGSUBKEY_CTR *ctr)
 751 {
 752         WERROR werr;
 753         uint32 num_items;
 754         uint8 *buf;
 755         uint32 buflen, len;
 756         int i;
 757         fstring subkeyname;
 758         int ret = -1;
 759         TALLOC_CTX *frame = talloc_stackframe();
 760         TDB_DATA value;
 761
 762         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
 763
 764         ctr->seqnum = regdb_get_seqnum();
 765
 766         value = regdb_fetch_key_internal(key, frame);
 767
 768         buf = value.dptr;
 769         buflen = value.dsize;
 770
 771         if ( !buf ) {
 772                 DEBUG(5,("regdb_fetch_keys: tdb lookup failed to locate key [%s]\n", key));
 773                 goto fail;
 774         }
 775
 776         len = tdb_unpack( buf, buflen, "d", &num_items);
 777
 778         for (i=0; i<num_items; i++) {
 779                 len += tdb_unpack(buf+len, buflen-len, "f", subkeyname);
 780                 werr = regsubkey_ctr_addkey(ctr, subkeyname);
 781                 if (!W_ERROR_IS_OK(werr)) {
 782                         DEBUG(5, ("regdb_fetch_keys: regsubkey_ctr_addkey "
 783                                   "failed: %s\n", dos_errstr(werr)));
 784                         goto fail;
 785                 }
 786         }
 787
 788         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
 789
 790         ret = num_items;
 791  fail:
 792         TALLOC_FREE(frame);
 793         return ret;
 794 }
 795
 796 /****************************************************************************
 797  Unpack a list of registry values frem the TDB
 798  ***************************************************************************/
 799
 800 static int regdb_unpack_values(REGVAL_CTR *values, uint8 *buf, int buflen)
 801 {
 802         int             len = 0;
 803         uint32          type;
 804         fstring valuename;
 805         uint32          size;
 806         uint8           *data_p;
 807         uint32          num_values = 0;
 808         int             i;
 809
 810         /* loop and unpack the rest of the registry values */
 811
 812         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
 813
 814         for ( i=0; i<num_values; i++ ) {
 815                 /* unpack the next regval */
 816
 817                 type = REG_NONE;
 818                 size = 0;
 819                 data_p = NULL;
 820                 valuename[0] = '\0';
 821                 len += tdb_unpack(buf+len, buflen-len, "fdB",
 822                                   valuename,
 823                                   &type,
 824                                   &size,
 825                                   &data_p);
 826
 827                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
 828
 829                 if (*valuename && size && data_p) {
 830                         regval_ctr_addvalue(values, valuename, type,
 831                                         (const char *)data_p, size);
 832                 }
 833                 SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
 834
 835                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
 836         }
 837
 838         return len;
 839 }
 840
 841 /****************************************************************************
 842  Pack all values in all printer keys
 843  ***************************************************************************/
 844
 845 static int regdb_pack_values(REGVAL_CTR *values, uint8 *buf, int buflen)
 846 {
 847         int             len = 0;
 848         int             i;
 849         REGISTRY_VALUE  *val;
 850         int             num_values;
 851
 852         if ( !values )
 853                 return 0;
 854
 855         num_values = regval_ctr_numvals( values );
 856
 857         /* pack the number of values first */
 858
 859         len += tdb_pack( buf+len, buflen-len, "d", num_values );
 860
 861         /* loop over all values */
 862
 863         for ( i=0; i<num_values; i++ ) {
 864                 val = regval_ctr_specific_value( values, i );
 865                 len += tdb_pack(buf+len, buflen-len, "fdB",
 866                                 regval_name(val),
 867                                 regval_type(val),
 868                                 regval_size(val),
 869                                 regval_data_p(val) );
 870         }
 871
 872         return len;
 873 }
 874
 875 /***********************************************************************
 876  Retrieve an array of strings containing subkeys.  Memory should be
 877  released by the caller.
 878  ***********************************************************************/
 879
 880 int regdb_fetch_values( const char* key, REGVAL_CTR *values )
 881 {
 882         char *keystr = NULL;
 883         TALLOC_CTX *ctx = talloc_stackframe();
 884         int ret = 0;
 885         TDB_DATA value;
 886
 887         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
 888
 889         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key);
 890         if (!keystr) {
 891                 return 0;
 892         }
 893
 894         values->seqnum = regdb_get_seqnum();
 895
 896         value = regdb_fetch_key_internal(keystr, ctx);
 897
 898         if (!value.dptr) {
 899                 /* all keys have zero values by default */
 900                 goto done;
 901         }
 902
 903         regdb_unpack_values(values, value.dptr, value.dsize);
 904         ret = regval_ctr_numvals(values);
 905
 906 done:
 907         TALLOC_FREE(ctx);
 908         return ret;
 909 }
 910
 911 bool regdb_store_values( const char *key, REGVAL_CTR *values )
 912 {
 913         TDB_DATA old_data, data;
 914         char *keystr = NULL;
 915         TALLOC_CTX *ctx = talloc_stackframe();
 916         int len;
 917         NTSTATUS status;
 918         bool result = false;
 919
 920         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
 921
 922         ZERO_STRUCT(data);
 923
 924         len = regdb_pack_values(values, data.dptr, data.dsize);
 925         if (len <= 0) {
 926                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
 927                 goto done;
 928         }
 929
 930         data.dptr = TALLOC_ARRAY(ctx, uint8, len);
 931         data.dsize = len;
 932
 933         len = regdb_pack_values(values, data.dptr, data.dsize);
 934
 935         SMB_ASSERT( len == data.dsize );
 936
 937         keystr = talloc_asprintf(ctx, "%s/%s", REG_VALUE_PREFIX, key );
 938         if (!keystr) {
 939                 goto done;
 940         }
 941         keystr = normalize_reg_path(ctx, keystr);
 942         if (!keystr) {
 943                 goto done;
 944         }
 945
 946         old_data = dbwrap_fetch_bystring(regdb, ctx, keystr);
 947
 948         if ((old_data.dptr != NULL)
 949             && (old_data.dsize == data.dsize)
 950             && (memcmp(old_data.dptr, data.dptr, data.dsize) == 0))
 951         {
 952                 result = true;
 953                 goto done;
 954         }
 955
 956         status = dbwrap_trans_store(regdb, string_term_tdb_data(keystr), data,
 957                                     TDB_REPLACE);
 958
 959         result = NT_STATUS_IS_OK(status);
 960
 961 done:
 962         TALLOC_FREE(ctx);
 963         return result;
 964 }
 965
 966 static WERROR regdb_get_secdesc(TALLOC_CTX *mem_ctx, const char *key,
 967                                 struct security_descriptor **psecdesc)
 968 {
 969         char *tdbkey;
 970         TDB_DATA data;
 971         NTSTATUS status;
 972         TALLOC_CTX *tmp_ctx = talloc_stackframe();
 973         WERROR err = WERR_OK;
 974
 975         DEBUG(10, ("regdb_get_secdesc: Getting secdesc of key [%s]\n", key));
 976
 977         tdbkey = talloc_asprintf(tmp_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
 978         if (tdbkey == NULL) {
 979                 err = WERR_NOMEM;
 980                 goto done;
 981         }
 982         normalize_dbkey(tdbkey);
 983
 984         data = dbwrap_fetch_bystring(regdb, tmp_ctx, tdbkey);
 985         if (data.dptr == NULL) {
 986                 err = WERR_BADFILE;
 987                 goto done;
 988         }
 989
 990         status = unmarshall_sec_desc(mem_ctx, (uint8 *)data.dptr, data.dsize,
 991                                      psecdesc);
 992
 993         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_MEMORY)) {
 994                 err = WERR_NOMEM;
 995         } else if (!NT_STATUS_IS_OK(status)) {
 996                 err = WERR_REG_CORRUPT;
 997         }
 998
 999 done:
1000         TALLOC_FREE(tmp_ctx);
1001         return err;
1002 }
1003
1004 static WERROR regdb_set_secdesc(const char *key,
1005                                 struct security_descriptor *secdesc)
1006 {
1007         TALLOC_CTX *mem_ctx = talloc_stackframe();
1008         char *tdbkey;
1009         NTSTATUS status;
1010         WERROR err = WERR_NOMEM;
1011         TDB_DATA tdbdata;
1012
1013         tdbkey = talloc_asprintf(mem_ctx, "%s/%s", REG_SECDESC_PREFIX, key);
1014         if (tdbkey == NULL) {
1015                 goto done;
1016         }
1017         normalize_dbkey(tdbkey);
1018
1019         if (secdesc == NULL) {
1020                 /* assuming a delete */
1021                 status = dbwrap_trans_delete(regdb,
1022                                              string_term_tdb_data(tdbkey));
1023                 if (NT_STATUS_IS_OK(status)) {
1024                         err = WERR_OK;
1025                 } else {
1026                         err = ntstatus_to_werror(status);
1027                 }
1028                 goto done;
1029         }
1030
1031         err = ntstatus_to_werror(marshall_sec_desc(mem_ctx, secdesc,
1032                                                    &tdbdata.dptr,
1033                                                    &tdbdata.dsize));
1034         if (!W_ERROR_IS_OK(err)) {
1035                 goto done;
1036         }
1037
1038         status = dbwrap_trans_store(regdb, string_term_tdb_data(tdbkey),
1039                                     tdbdata, 0);
1040         if (!NT_STATUS_IS_OK(status)) {
1041                 err = ntstatus_to_werror(status);
1042                 goto done;
1043         }
1044
1045  done:
1046         TALLOC_FREE(mem_ctx);
1047         return err;
1048 }
1049
1050 bool regdb_subkeys_need_update(REGSUBKEY_CTR *subkeys)
1051 {
1052         return (regdb_get_seqnum() != subkeys->seqnum);
1053 }
1054
1055 bool regdb_values_need_update(REGVAL_CTR *values)
1056 {
1057         return (regdb_get_seqnum() != values->seqnum);
1058 }
1059
1060 /*
1061  * Table of function pointers for default access
1062  */
1063
1064 REGISTRY_OPS regdb_ops = {
1065         .fetch_subkeys = regdb_fetch_keys,
1066         .fetch_values = regdb_fetch_values,
1067         .store_subkeys = regdb_store_keys,
1068         .store_values = regdb_store_values,
1069         .get_secdesc = regdb_get_secdesc,
1070         .set_secdesc = regdb_set_secdesc,
1071         .subkeys_need_update = regdb_subkeys_need_update,
1072         .values_need_update = regdb_values_need_update
1073 };