source/registry/reg_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 2 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, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 /* Implementation of internal registry database functions. */
  22
  23 #include "includes.h"
  24
  25 #undef DBGC_CLASS
  26 #define DBGC_CLASS DBGC_RPC_SRV
  27
  28 static TDB_CONTEXT *tdb_reg;
  29 static int tdb_refcount;
  30
  31 #define VALUE_PREFIX    "SAMBA_REGVAL"
  32
  33 /* List the deepest path into the registry.  All part components will be created.*/
  34
  35 /* If you want to have a part of the path controlled by the tdb and part by
  36    a virtual registry db (e.g. printing), then you have to list the deepest path.
  37    For example,"HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion/Print"
  38    allows the reg_db backend to handle everything up to
  39    "HKLM/SOFTWARE/Microsoft/Windows NT/CurrentVersion" and then we'll hook
  40    the reg_printing backend onto the last component of the path (see
  41    KEY_PRINTING_2K in include/rpc_reg.h)   --jerry */
  42
  43 static const char *builtin_registry_paths[] = {
  44         KEY_PRINTING_2K,
  45         KEY_PRINTING_PORTS,
  46         KEY_PRINTING,
  47         KEY_SHARES,
  48         KEY_EVENTLOG,
  49         "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Perflib",
  50         "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Perflib\\009",
  51         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Print\\Monitors",
  52         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\ProductOptions",
  53         "HKLM\\SYSTEM\\CurrentControlSet\\Control\\Terminal Server\\DefaultUserConfiguration",
  54         "HKLM\\SYSTEM\\CurrentControlSet\\Services\\TcpIp\\Parameters",
  55         "HKLM\\SYSTEM\\CurrentControlSet\\Services\\Netlogon\\Parameters",
  56         "HKU",
  57         "HKCR",
  58         "HKPD",
  59         "HKPT",
  60          NULL };
  61
  62 struct builtin_regkey_value {
  63         const char *path;
  64         const char *valuename;
  65         uint32 type;
  66         union {
  67                 const char *string;
  68                 uint32 dw_value;
  69         } data;
  70 };
  71
  72 static struct builtin_regkey_value builtin_registry_values[] = {
  73         { KEY_PRINTING_PORTS,
  74                 SAMBA_PRINTER_PORT_NAME, REG_SZ, { "" } },
  75         { KEY_PRINTING_2K,
  76                 "DefaultSpoolDirectory", REG_SZ, { "C:\\Windows\\System32\\Spool\\Printers" } },
  77         { KEY_EVENTLOG,
  78                 "DisplayName", REG_SZ, { "Event Log" } },
  79         { KEY_EVENTLOG,
  80                 "ErrorControl", REG_DWORD, { (char*)0x00000001 } },
  81         { NULL, NULL, 0, { NULL } }
  82 };
  83
  84 #define REGVER_V1       1       /* first db version with write support */
  85
  86 /***********************************************************************
  87  Open the registry data in the tdb
  88  ***********************************************************************/
  89
  90 static BOOL init_registry_data( void )
  91 {
  92         pstring path, base, remaining;
  93         fstring keyname, subkeyname;
  94         REGSUBKEY_CTR *subkeys;
  95         REGVAL_CTR *values;
  96         int i;
  97         const char *p, *p2;
  98         UNISTR2 data;
  99
 100         /* loop over all of the predefined paths and add each component */
 101
 102         for ( i=0; builtin_registry_paths[i] != NULL; i++ ) {
 103
 104                 DEBUG(6,("init_registry_data: Adding [%s]\n", builtin_registry_paths[i]));
 105
 106                 pstrcpy( path, builtin_registry_paths[i] );
 107                 pstrcpy( base, "" );
 108                 p = path;
 109
 110                 while ( next_token(&p, keyname, "\\", sizeof(keyname)) ) {
 111
 112                         /* build up the registry path from the components */
 113
 114                         if ( *base )
 115                                 pstrcat( base, "\\" );
 116                         pstrcat( base, keyname );
 117
 118                         /* get the immediate subkeyname (if we have one ) */
 119
 120                         *subkeyname = '\0';
 121                         if ( *p ) {
 122                                 pstrcpy( remaining, p );
 123                                 p2 = remaining;
 124
 125                                 if ( !next_token(&p2, subkeyname, "\\", sizeof(subkeyname)) )
 126                                         fstrcpy( subkeyname, p2 );
 127                         }
 128
 129                         DEBUG(10,("init_registry_data: Storing key [%s] with subkey [%s]\n",
 130                                 base, *subkeyname ? subkeyname : "NULL"));
 131
 132                         /* we don't really care if the lookup succeeds or not since
 133                            we are about to update the record.  We just want any
 134                            subkeys already present */
 135
 136                         if ( !(subkeys = TALLOC_ZERO_P( NULL, REGSUBKEY_CTR )) ) {
 137                                 DEBUG(0,("talloc() failure!\n"));
 138                                 return False;
 139                         }
 140
 141                         regdb_fetch_keys( base, subkeys );
 142                         if ( *subkeyname )
 143                                 regsubkey_ctr_addkey( subkeys, subkeyname );
 144                         if ( !regdb_store_keys( base, subkeys ))
 145                                 return False;
 146
 147                         TALLOC_FREE( subkeys );
 148                 }
 149         }
 150
 151         /* loop over all of the predefined values and add each component */
 152
 153         for ( i=0; builtin_registry_values[i].path != NULL; i++ ) {
 154                 if ( !(values = TALLOC_ZERO_P( NULL, REGVAL_CTR )) ) {
 155                         DEBUG(0,("talloc() failure!\n"));
 156                         return False;
 157                 }
 158
 159                 regdb_fetch_values( builtin_registry_values[i].path, values );
 160
 161                 /* preserve existing values across restarts.  Only add new ones */
 162
 163                 if ( !regval_ctr_key_exists( values, builtin_registry_values[i].valuename ) )
 164                 {
 165                         switch( builtin_registry_values[i].type ) {
 166                         case REG_DWORD:
 167                                 regval_ctr_addvalue( values,
 168                                                      builtin_registry_values[i].valuename,
 169                                                      REG_DWORD,
 170                                                      (char*)&builtin_registry_values[i].data.dw_value,
 171                                                      sizeof(uint32) );
 172                                 break;
 173
 174                         case REG_SZ:
 175                                 init_unistr2( &data, builtin_registry_values[i].data.string, UNI_STR_TERMINATE);
 176                                 regval_ctr_addvalue( values,
 177                                                      builtin_registry_values[i].valuename,
 178                                                      REG_SZ,
 179                                                      (char*)data.buffer,
 180                                                      data.uni_str_len*sizeof(uint16) );
 181                                 break;
 182
 183                         default:
 184                                 DEBUG(0,("init_registry_data: invalid value type in builtin_registry_values [%d]\n",
 185                                         builtin_registry_values[i].type));
 186                         }
 187                         regdb_store_values( builtin_registry_values[i].path, values );
 188                 }
 189
 190                 TALLOC_FREE( values );
 191         }
 192
 193         return True;
 194 }
 195
 196 /***********************************************************************
 197  Open the registry database
 198  ***********************************************************************/
 199
 200 BOOL regdb_init( void )
 201 {
 202         const char *vstring = "INFO/version";
 203         uint32 vers_id;
 204
 205         if ( tdb_reg )
 206                 return True;
 207
 208         if ( !(tdb_reg = tdb_open_log(lock_path("registry.tdb"), 0, TDB_DEFAULT, O_RDWR, 0600)) )
 209         {
 210                 tdb_reg = tdb_open_log(lock_path("registry.tdb"), 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
 211                 if ( !tdb_reg ) {
 212                         DEBUG(0,("regdb_init: Failed to open registry %s (%s)\n",
 213                                 lock_path("registry.tdb"), strerror(errno) ));
 214                         return False;
 215                 }
 216
 217                 DEBUG(10,("regdb_init: Successfully created registry tdb\n"));
 218         }
 219
 220         tdb_refcount = 1;
 221
 222
 223         vers_id = tdb_fetch_int32(tdb_reg, vstring);
 224
 225         if ( vers_id != REGVER_V1 ) {
 226                 /* any upgrade code here if needed */
 227         }
 228
 229         /* always setup the necessary keys and values */
 230
 231         if ( !init_registry_data() ) {
 232                 DEBUG(0,("init_registry: Failed to initialize data in registry!\n"));
 233                 return False;
 234         }
 235
 236         return True;
 237 }
 238
 239 /***********************************************************************
 240  Open the registry.  Must already have been initialized by regdb_init()
 241  ***********************************************************************/
 242
 243 WERROR regdb_open( void )
 244 {
 245         WERROR result = WERR_OK;
 246
 247         if ( tdb_reg ) {
 248                 DEBUG(10,("regdb_open: incrementing refcount (%d)\n", tdb_refcount));
 249                 tdb_refcount++;
 250                 return WERR_OK;
 251         }
 252
 253         become_root();
 254
 255         tdb_reg = tdb_open_log(lock_path("registry.tdb"), 0, TDB_DEFAULT, O_RDWR, 0600);
 256         if ( !tdb_reg ) {
 257                 result = ntstatus_to_werror( map_nt_error_from_unix( errno ) );
 258                 DEBUG(0,("regdb_open: Failed to open %s! (%s)\n",
 259                         lock_path("registry.tdb"), strerror(errno) ));
 260         }
 261
 262         unbecome_root();
 263
 264         tdb_refcount = 1;
 265         DEBUG(10,("regdb_open: refcount reset (%d)\n", tdb_refcount));
 266
 267         return result;
 268 }
 269
 270 /***********************************************************************
 271  ***********************************************************************/
 272
 273 int regdb_close( void )
 274 {
 275         int ret;
 276
 277         tdb_refcount--;
 278
 279         DEBUG(10,("regdb_close: decrementing refcount (%d)\n", tdb_refcount));
 280
 281         if ( tdb_refcount > 0 )
 282                 return 0;
 283
 284         SMB_ASSERT( tdb_refcount >= 0 );
 285
 286         ret = tdb_close( tdb_reg );
 287         tdb_reg = NULL;
 288
 289         return ret;
 290 }
 291
 292 /***********************************************************************
 293  Add subkey strings to the registry tdb under a defined key
 294  fmt is the same format as tdb_pack except this function only supports
 295  fstrings
 296  ***********************************************************************/
 297
 298 static BOOL regdb_store_keys_internal( const char *key, REGSUBKEY_CTR *ctr )
 299 {
 300         TDB_DATA kbuf, dbuf;
 301         char *buffer;
 302         int i = 0;
 303         uint32 len, buflen;
 304         BOOL ret = True;
 305         uint32 num_subkeys = regsubkey_ctr_numkeys( ctr );
 306         pstring keyname;
 307
 308         if ( !key )
 309                 return False;
 310
 311         pstrcpy( keyname, key );
 312         normalize_reg_path( keyname );
 313
 314         /* allocate some initial memory */
 315
 316         if (!(buffer = (char *)SMB_MALLOC(sizeof(pstring)))) {
 317                 return False;
 318         }
 319         buflen = sizeof(pstring);
 320         len = 0;
 321
 322         /* store the number of subkeys */
 323
 324         len += tdb_pack(buffer+len, buflen-len, "d", num_subkeys );
 325
 326         /* pack all the strings */
 327
 328         for (i=0; i<num_subkeys; i++) {
 329                 len += tdb_pack( buffer+len, buflen-len, "f", regsubkey_ctr_specific_key(ctr, i) );
 330                 if ( len > buflen ) {
 331                         /* allocate some extra space */
 332                         if ((buffer = (char *)SMB_REALLOC( buffer, len*2 )) == NULL) {
 333                                 DEBUG(0,("regdb_store_keys: Failed to realloc memory of size [%d]\n", len*2));
 334                                 ret = False;
 335                                 goto done;
 336                         }
 337                         buflen = len*2;
 338
 339                         len = tdb_pack( buffer+len, buflen-len, "f", regsubkey_ctr_specific_key(ctr, i) );
 340                 }
 341         }
 342
 343         /* finally write out the data */
 344
 345         kbuf.dptr = keyname;
 346         kbuf.dsize = strlen(keyname)+1;
 347         dbuf.dptr = buffer;
 348         dbuf.dsize = len;
 349         if ( tdb_store( tdb_reg, kbuf, dbuf, TDB_REPLACE ) == -1) {
 350                 ret = False;
 351                 goto done;
 352         }
 353
 354 done:
 355         SAFE_FREE( buffer );
 356
 357         return ret;
 358 }
 359
 360 /***********************************************************************
 361  Store the new subkey record and create any child key records that
 362  do not currently exist
 363  ***********************************************************************/
 364
 365 BOOL regdb_store_keys( const char *key, REGSUBKEY_CTR *ctr )
 366 {
 367         int num_subkeys, i;
 368         pstring path;
 369         REGSUBKEY_CTR *subkeys, *old_subkeys;
 370         char *oldkeyname;
 371
 372         /* fetch a list of the old subkeys so we can determine if any were deleted */
 373
 374         if ( !(old_subkeys = TALLOC_ZERO_P( ctr, REGSUBKEY_CTR )) ) {
 375                 DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 376                 return False;
 377         }
 378
 379         regdb_fetch_keys( key, old_subkeys );
 380
 381         /* store the subkey list for the parent */
 382
 383         if ( !regdb_store_keys_internal( key, ctr ) ) {
 384                 DEBUG(0,("regdb_store_keys: Failed to store new subkey list for parent [%s}\n", key ));
 385                 return False;
 386         }
 387
 388         /* now delete removed keys */
 389
 390         num_subkeys = regsubkey_ctr_numkeys( old_subkeys );
 391         for ( i=0; i<num_subkeys; i++ ) {
 392                 oldkeyname = regsubkey_ctr_specific_key( old_subkeys, i );
 393                 if ( !regsubkey_ctr_key_exists( ctr, oldkeyname ) ) {
 394                         pstr_sprintf( path, "%s%c%s", key, '/', oldkeyname );
 395                         normalize_reg_path( path );
 396                         tdb_delete_bystring( tdb_reg, path );
 397                 }
 398         }
 399
 400         TALLOC_FREE( old_subkeys );
 401
 402         /* now create records for any subkeys that don't already exist */
 403
 404         num_subkeys = regsubkey_ctr_numkeys( ctr );
 405         for ( i=0; i<num_subkeys; i++ ) {
 406                 pstr_sprintf( path, "%s%c%s", key, '/', regsubkey_ctr_specific_key( ctr, i ) );
 407
 408                 if ( !(subkeys = TALLOC_ZERO_P( ctr, REGSUBKEY_CTR )) ) {
 409                         DEBUG(0,("regdb_store_keys: talloc() failure!\n"));
 410                         return False;
 411                 }
 412
 413                 if ( regdb_fetch_keys( path, subkeys ) == -1 ) {
 414                         /* create a record with 0 subkeys */
 415                         if ( !regdb_store_keys_internal( path, subkeys ) ) {
 416                                 DEBUG(0,("regdb_store_keys: Failed to store new record for key [%s}\n", path ));
 417                                 TALLOC_FREE( subkeys );
 418                                 return False;
 419                         }
 420                 }
 421
 422                 TALLOC_FREE( subkeys );
 423         }
 424
 425         return True;
 426 }
 427
 428
 429 /***********************************************************************
 430  Retrieve an array of strings containing subkeys.  Memory should be
 431  released by the caller.
 432  ***********************************************************************/
 433
 434 int regdb_fetch_keys( const char* key, REGSUBKEY_CTR *ctr )
 435 {
 436         pstring path;
 437         uint32 num_items;
 438         TDB_DATA dbuf;
 439         char *buf;
 440         uint32 buflen, len;
 441         int i;
 442         fstring subkeyname;
 443
 444         DEBUG(11,("regdb_fetch_keys: Enter key => [%s]\n", key ? key : "NULL"));
 445
 446         pstrcpy( path, key );
 447
 448         /* convert to key format */
 449         pstring_sub( path, "\\", "/" );
 450         strupper_m( path );
 451
 452         dbuf = tdb_fetch_bystring( tdb_reg, path );
 453
 454         buf = dbuf.dptr;
 455         buflen = dbuf.dsize;
 456
 457         if ( !buf ) {
 458                 DEBUG(5,("regdb_fetch_keys: tdb lookup failed to locate key [%s]\n", key));
 459                 return -1;
 460         }
 461
 462         len = tdb_unpack( buf, buflen, "d", &num_items);
 463
 464         for (i=0; i<num_items; i++) {
 465                 len += tdb_unpack( buf+len, buflen-len, "f", subkeyname );
 466                 regsubkey_ctr_addkey( ctr, subkeyname );
 467         }
 468
 469         SAFE_FREE( dbuf.dptr );
 470
 471         DEBUG(11,("regdb_fetch_keys: Exit [%d] items\n", num_items));
 472
 473         return num_items;
 474 }
 475
 476 /****************************************************************************
 477  Unpack a list of registry values frem the TDB
 478  ***************************************************************************/
 479
 480 static int regdb_unpack_values(REGVAL_CTR *values, char *buf, int buflen)
 481 {
 482         int             len = 0;
 483         uint32          type;
 484         pstring         valuename;
 485         uint32          size;
 486         uint8           *data_p;
 487         uint32          num_values = 0;
 488         int             i;
 489
 490
 491
 492         /* loop and unpack the rest of the registry values */
 493
 494         len += tdb_unpack(buf+len, buflen-len, "d", &num_values);
 495
 496         for ( i=0; i<num_values; i++ ) {
 497                 /* unpack the next regval */
 498
 499                 type = REG_NONE;
 500                 size = 0;
 501                 data_p = NULL;
 502                 len += tdb_unpack(buf+len, buflen-len, "fdB",
 503                                   valuename,
 504                                   &type,
 505                                   &size,
 506                                   &data_p);
 507
 508                 /* add the new value. Paranoid protective code -- make sure data_p is valid */
 509
 510                 if ( size && data_p ) {
 511                         regval_ctr_addvalue( values, valuename, type, (const char *)data_p, size );
 512                         SAFE_FREE(data_p); /* 'B' option to tdb_unpack does a malloc() */
 513                 }
 514
 515                 DEBUG(8,("specific: [%s], len: %d\n", valuename, size));
 516         }
 517
 518         return len;
 519 }
 520
 521 /****************************************************************************
 522  Pack all values in all printer keys
 523  ***************************************************************************/
 524
 525 static int regdb_pack_values(REGVAL_CTR *values, char *buf, int buflen)
 526 {
 527         int             len = 0;
 528         int             i;
 529         REGISTRY_VALUE  *val;
 530         int             num_values;
 531
 532         if ( !values )
 533                 return 0;
 534
 535         num_values = regval_ctr_numvals( values );
 536
 537         /* pack the number of values first */
 538
 539         len += tdb_pack( buf+len, buflen-len, "d", num_values );
 540
 541         /* loop over all values */
 542
 543         for ( i=0; i<num_values; i++ ) {
 544                 val = regval_ctr_specific_value( values, i );
 545                 len += tdb_pack(buf+len, buflen-len, "fdB",
 546                                 regval_name(val),
 547                                 regval_type(val),
 548                                 regval_size(val),
 549                                 regval_data_p(val) );
 550         }
 551
 552         return len;
 553 }
 554
 555 /***********************************************************************
 556  Retrieve an array of strings containing subkeys.  Memory should be
 557  released by the caller.
 558  ***********************************************************************/
 559
 560 int regdb_fetch_values( const char* key, REGVAL_CTR *values )
 561 {
 562         TDB_DATA data;
 563         pstring keystr;
 564
 565         DEBUG(10,("regdb_fetch_values: Looking for value of key [%s] \n", key));
 566
 567         pstr_sprintf( keystr, "%s/%s", VALUE_PREFIX, key );
 568         normalize_reg_path( keystr );
 569
 570         data = tdb_fetch_bystring( tdb_reg, keystr );
 571
 572         if ( !data.dptr ) {
 573                 /* all keys have zero values by default */
 574                 return 0;
 575         }
 576
 577         regdb_unpack_values( values, data.dptr, data.dsize );
 578
 579         SAFE_FREE( data.dptr );
 580
 581         return regval_ctr_numvals(values);
 582 }
 583
 584 /***********************************************************************
 585  Stub function since we do not currently support storing registry
 586  values in the registry.tdb
 587  ***********************************************************************/
 588
 589 BOOL regdb_store_values( const char *key, REGVAL_CTR *values )
 590 {
 591         TDB_DATA data;
 592         pstring keystr;
 593         int len, ret;
 594
 595         DEBUG(10,("regdb_store_values: Looking for value of key [%s] \n", key));
 596
 597         ZERO_STRUCT( data );
 598
 599         len = regdb_pack_values( values, data.dptr, data.dsize );
 600         if ( len <= 0 ) {
 601                 DEBUG(0,("regdb_store_values: unable to pack values. len <= 0\n"));
 602                 return False;
 603         }
 604
 605         data.dptr = SMB_MALLOC_ARRAY( char, len );
 606         data.dsize = len;
 607
 608         len = regdb_pack_values( values, data.dptr, data.dsize );
 609
 610         SMB_ASSERT( len == data.dsize );
 611
 612         pstr_sprintf( keystr, "%s/%s", VALUE_PREFIX, key );
 613         normalize_reg_path( keystr );
 614
 615         ret = tdb_store_bystring(tdb_reg, keystr, data, TDB_REPLACE);
 616
 617         SAFE_FREE( data.dptr );
 618
 619         return ret != -1 ;
 620 }
 621
 622
 623 /*
 624  * Table of function pointers for default access
 625  */
 626
 627 REGISTRY_OPS regdb_ops = {
 628         regdb_fetch_keys,
 629         regdb_fetch_values,
 630         regdb_store_keys,
 631         regdb_store_values,
 632         NULL
 633 };
 634
 635