source3/registry/regfio.c

   1 /*
   2  * Unix SMB/CIFS implementation.
   3  * Windows NT registry I/O library
   4  * Copyright (c) Gerald (Jerry) Carter               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 #include "includes.h"
  21 #include "reg_parse_prs.h"
  22 #include "regfio.h"
  23 #include "reg_objects.h"
  24 #include "../librpc/gen_ndr/ndr_security.h"
  25
  26 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_REGISTRY
  28
  29 /*******************************************************************
  30  *
  31  * TODO : Right now this code basically ignores classnames.
  32  *
  33  ******************************************************************/
  34
  35 /*******************************************************************
  36  Reads or writes an NTTIME structure.
  37 ********************************************************************/
  38
  39 static bool smb_io_time(const char *desc, NTTIME *nttime, prs_struct *ps, int depth)
  40 {
  41         uint32 low, high;
  42         if (nttime == NULL)
  43                 return False;
  44
  45         prs_debug(ps, depth, desc, "smb_io_time");
  46         depth++;
  47
  48         if(!prs_align(ps))
  49                 return False;
  50
  51         if (MARSHALLING(ps)) {
  52                 low = *nttime & 0xFFFFFFFF;
  53                 high = *nttime >> 32;
  54         }
  55
  56         if(!prs_uint32("low ", ps, depth, &low)) /* low part */
  57                 return False;
  58         if(!prs_uint32("high", ps, depth, &high)) /* high part */
  59                 return False;
  60
  61         if (UNMARSHALLING(ps)) {
  62                 *nttime = (((uint64_t)high << 32) + low);
  63         }
  64
  65         return True;
  66 }
  67
  68 /*******************************************************************
  69 *******************************************************************/
  70
  71 static int write_block( REGF_FILE *file, prs_struct *ps, uint32 offset )
  72 {
  73         int bytes_written, returned;
  74         char *buffer = prs_data_p( ps );
  75         uint32 buffer_size = prs_data_size( ps );
  76         SMB_STRUCT_STAT sbuf;
  77
  78         if ( file->fd == -1 )
  79                 return -1;
  80
  81         /* check for end of file */
  82
  83         if (sys_fstat(file->fd, &sbuf, false)) {
  84                 DEBUG(0,("write_block: stat() failed! (%s)\n", strerror(errno)));
  85                 return -1;
  86         }
  87
  88         if ( lseek( file->fd, offset, SEEK_SET ) == -1 ) {
  89                 DEBUG(0,("write_block: lseek() failed! (%s)\n", strerror(errno) ));
  90                 return -1;
  91         }
  92
  93         bytes_written = returned = 0;
  94         while ( bytes_written < buffer_size ) {
  95                 if ( (returned = write( file->fd, buffer+bytes_written, buffer_size-bytes_written )) == -1 ) {
  96                         DEBUG(0,("write_block: write() failed! (%s)\n", strerror(errno) ));
  97                         return False;
  98                 }
  99
 100                 bytes_written += returned;
 101         }
 102
 103         return bytes_written;
 104 }
 105
 106 /*******************************************************************
 107 *******************************************************************/
 108
 109 static int read_block( REGF_FILE *file, prs_struct *ps, uint32 file_offset, uint32 block_size )
 110 {
 111         int bytes_read, returned;
 112         char *buffer;
 113         SMB_STRUCT_STAT sbuf;
 114
 115         /* check for end of file */
 116
 117         if (sys_fstat(file->fd, &sbuf, false)) {
 118                 DEBUG(0,("read_block: stat() failed! (%s)\n", strerror(errno)));
 119                 return -1;
 120         }
 121
 122         if ( (size_t)file_offset >= sbuf.st_ex_size )
 123                 return -1;
 124
 125         /* if block_size == 0, we are parsing HBIN records and need
 126            to read some of the header to get the block_size from there */
 127
 128         if ( block_size == 0 ) {
 129                 char hdr[0x20];
 130
 131                 if ( lseek( file->fd, file_offset, SEEK_SET ) == -1 ) {
 132                         DEBUG(0,("read_block: lseek() failed! (%s)\n", strerror(errno) ));
 133                         return -1;
 134                 }
 135
 136                 returned = read( file->fd, hdr, 0x20 );
 137                 if ( (returned == -1) || (returned < 0x20) ) {
 138                         DEBUG(0,("read_block: failed to read in HBIN header. Is the file corrupt?\n"));
 139                         return -1;
 140                 }
 141
 142                 /* make sure this is an hbin header */
 143
 144                 if ( strncmp( hdr, "hbin", HBIN_HDR_SIZE ) != 0 ) {
 145                         DEBUG(0,("read_block: invalid block header!\n"));
 146                         return -1;
 147                 }
 148
 149                 block_size = IVAL( hdr, 0x08 );
 150         }
 151
 152         DEBUG(10,("read_block: block_size == 0x%x\n", block_size ));
 153
 154         /* set the offset, initialize the buffer, and read the block from disk */
 155
 156         if ( lseek( file->fd, file_offset, SEEK_SET ) == -1 ) {
 157                 DEBUG(0,("read_block: lseek() failed! (%s)\n", strerror(errno) ));
 158                 return -1;
 159         }
 160
 161         if (!prs_init( ps, block_size, file->mem_ctx, UNMARSHALL )) {
 162                 DEBUG(0,("read_block: prs_init() failed! (%s)\n", strerror(errno) ));
 163                 return -1;
 164         }
 165         buffer = prs_data_p( ps );
 166         bytes_read = returned = 0;
 167
 168         while ( bytes_read < block_size ) {
 169                 if ( (returned = read( file->fd, buffer+bytes_read, block_size-bytes_read )) == -1 ) {
 170                         DEBUG(0,("read_block: read() failed (%s)\n", strerror(errno) ));
 171                         return False;
 172                 }
 173                 if ( (returned == 0) && (bytes_read < block_size) ) {
 174                         DEBUG(0,("read_block: not a vald registry file ?\n" ));
 175                         return False;
 176                 }
 177
 178                 bytes_read += returned;
 179         }
 180
 181         return bytes_read;
 182 }
 183
 184 /*******************************************************************
 185 *******************************************************************/
 186
 187 static bool write_hbin_block( REGF_FILE *file, REGF_HBIN *hbin )
 188 {
 189         if ( !hbin->dirty )
 190                 return True;
 191
 192         /* write free space record if any is available */
 193
 194         if ( hbin->free_off != REGF_OFFSET_NONE ) {
 195                 uint32 header = 0xffffffff;
 196
 197                 if ( !prs_set_offset( &hbin->ps, hbin->free_off-sizeof(uint32) ) )
 198                         return False;
 199                 if ( !prs_uint32( "free_size", &hbin->ps, 0, &hbin->free_size ) )
 200                         return False;
 201                 if ( !prs_uint32( "free_header", &hbin->ps, 0, &header ) )
 202                         return False;
 203         }
 204
 205         hbin->dirty = (write_block( file, &hbin->ps, hbin->file_off ) != -1);
 206
 207         return hbin->dirty;
 208 }
 209
 210 /*******************************************************************
 211 *******************************************************************/
 212
 213 static bool hbin_block_close( REGF_FILE *file, REGF_HBIN *hbin )
 214 {
 215         REGF_HBIN *p;
 216
 217         /* remove the block from the open list and flush it to disk */
 218
 219         for ( p=file->block_list; p && p!=hbin; p=p->next )
 220                 ;;
 221
 222         if ( p == hbin ) {
 223                 DLIST_REMOVE( file->block_list, hbin );
 224         }
 225         else
 226                 DEBUG(0,("hbin_block_close: block not in open list!\n"));
 227
 228         if ( !write_hbin_block( file, hbin ) )
 229                 return False;
 230
 231         return True;
 232 }
 233
 234 /*******************************************************************
 235 *******************************************************************/
 236
 237 static bool prs_regf_block( const char *desc, prs_struct *ps, int depth, REGF_FILE *file )
 238 {
 239         prs_debug(ps, depth, desc, "prs_regf_block");
 240         depth++;
 241
 242         if ( !prs_uint8s( True, "header", ps, depth, (uint8*)file->header, sizeof( file->header )) )
 243                 return False;
 244
 245         /* yes, these values are always identical so store them only once */
 246
 247         if ( !prs_uint32( "unknown1", ps, depth, &file->unknown1 ))
 248                 return False;
 249         if ( !prs_uint32( "unknown1 (again)", ps, depth, &file->unknown1 ))
 250                 return False;
 251
 252         /* get the modtime */
 253
 254         if ( !prs_set_offset( ps, 0x0c ) )
 255                 return False;
 256         if ( !smb_io_time( "modtime", &file->mtime, ps, depth ) )
 257                 return False;
 258
 259         /* constants */
 260
 261         if ( !prs_uint32( "unknown2", ps, depth, &file->unknown2 ))
 262                 return False;
 263         if ( !prs_uint32( "unknown3", ps, depth, &file->unknown3 ))
 264                 return False;
 265         if ( !prs_uint32( "unknown4", ps, depth, &file->unknown4 ))
 266                 return False;
 267         if ( !prs_uint32( "unknown5", ps, depth, &file->unknown5 ))
 268                 return False;
 269
 270         /* get file offsets */
 271
 272         if ( !prs_set_offset( ps, 0x24 ) )
 273                 return False;
 274         if ( !prs_uint32( "data_offset", ps, depth, &file->data_offset ))
 275                 return False;
 276         if ( !prs_uint32( "last_block", ps, depth, &file->last_block ))
 277                 return False;
 278
 279         /* one more constant */
 280
 281         if ( !prs_uint32( "unknown6", ps, depth, &file->unknown6 ))
 282                 return False;
 283
 284         /* get the checksum */
 285
 286         if ( !prs_set_offset( ps, 0x01fc ) )
 287                 return False;
 288         if ( !prs_uint32( "checksum", ps, depth, &file->checksum ))
 289                 return False;
 290
 291         return True;
 292 }
 293
 294 /*******************************************************************
 295 *******************************************************************/
 296
 297 static bool prs_hbin_block( const char *desc, prs_struct *ps, int depth, REGF_HBIN *hbin )
 298 {
 299         uint32 block_size2;
 300
 301         prs_debug(ps, depth, desc, "prs_regf_block");
 302         depth++;
 303
 304         if ( !prs_uint8s( True, "header", ps, depth, (uint8*)hbin->header, sizeof( hbin->header )) )
 305                 return False;
 306
 307         if ( !prs_uint32( "first_hbin_off", ps, depth, &hbin->first_hbin_off ))
 308                 return False;
 309
 310         /* The dosreg.cpp comments say that the block size is at 0x1c.
 311            According to a WINXP NTUSER.dat file, this is wrong.  The block_size
 312            is at 0x08 */
 313
 314         if ( !prs_uint32( "block_size", ps, depth, &hbin->block_size ))
 315                 return False;
 316
 317         block_size2 = hbin->block_size;
 318         prs_set_offset( ps, 0x1c );
 319         if ( !prs_uint32( "block_size2", ps, depth, &block_size2 ))
 320                 return False;
 321
 322         if ( MARSHALLING(ps) )
 323                 hbin->dirty = True;
 324
 325
 326         return True;
 327 }
 328
 329 /*******************************************************************
 330 *******************************************************************/
 331
 332 static bool prs_nk_rec( const char *desc, prs_struct *ps, int depth, REGF_NK_REC *nk )
 333 {
 334         uint16 class_length, name_length;
 335         uint32 start;
 336         uint32 data_size, start_off, end_off;
 337         uint32 unknown_off = REGF_OFFSET_NONE;
 338
 339         nk->hbin_off = prs_offset( ps );
 340         start = nk->hbin_off;
 341
 342         prs_debug(ps, depth, desc, "prs_nk_rec");
 343         depth++;
 344
 345         /* back up and get the data_size */
 346
 347         if ( !prs_set_offset( ps, prs_offset(ps)-sizeof(uint32)) )
 348                 return False;
 349         start_off = prs_offset( ps );
 350         if ( !prs_uint32( "rec_size", ps, depth, &nk->rec_size ))
 351                 return False;
 352
 353         if ( !prs_uint8s( True, "header", ps, depth, (uint8*)nk->header, sizeof( nk->header )) )
 354                 return False;
 355
 356         if ( !prs_uint16( "key_type", ps, depth, &nk->key_type ))
 357                 return False;
 358         if ( !smb_io_time( "mtime", &nk->mtime, ps, depth ))
 359                 return False;
 360
 361         if ( !prs_set_offset( ps, start+0x0010 ) )
 362                 return False;
 363         if ( !prs_uint32( "parent_off", ps, depth, &nk->parent_off ))
 364                 return False;
 365         if ( !prs_uint32( "num_subkeys", ps, depth, &nk->num_subkeys ))
 366                 return False;
 367
 368         if ( !prs_set_offset( ps, start+0x001c ) )
 369                 return False;
 370         if ( !prs_uint32( "subkeys_off", ps, depth, &nk->subkeys_off ))
 371                 return False;
 372         if ( !prs_uint32( "unknown_off", ps, depth, &unknown_off) )
 373                 return False;
 374
 375         if ( !prs_set_offset( ps, start+0x0024 ) )
 376                 return False;
 377         if ( !prs_uint32( "num_values", ps, depth, &nk->num_values ))
 378                 return False;
 379         if ( !prs_uint32( "values_off", ps, depth, &nk->values_off ))
 380                 return False;
 381         if ( !prs_uint32( "sk_off", ps, depth, &nk->sk_off ))
 382                 return False;
 383         if ( !prs_uint32( "classname_off", ps, depth, &nk->classname_off ))
 384                 return False;
 385
 386         if ( !prs_uint32( "max_bytes_subkeyname", ps, depth, &nk->max_bytes_subkeyname))
 387                 return False;
 388         if ( !prs_uint32( "max_bytes_subkeyclassname", ps, depth, &nk->max_bytes_subkeyclassname))
 389                 return False;
 390         if ( !prs_uint32( "max_bytes_valuename", ps, depth, &nk->max_bytes_valuename))
 391                 return False;
 392         if ( !prs_uint32( "max_bytes_value", ps, depth, &nk->max_bytes_value))
 393                 return False;
 394         if ( !prs_uint32( "unknown index", ps, depth, &nk->unk_index))
 395                 return False;
 396
 397         name_length = nk->keyname ? strlen(nk->keyname) : 0 ;
 398         class_length = nk->classname ? strlen(nk->classname) : 0 ;
 399         if ( !prs_uint16( "name_length", ps, depth, &name_length ))
 400                 return False;
 401         if ( !prs_uint16( "class_length", ps, depth, &class_length ))
 402                 return False;
 403
 404         if ( class_length ) {
 405                 ;;
 406         }
 407
 408         if ( name_length ) {
 409                 if ( UNMARSHALLING(ps) ) {
 410                         if ( !(nk->keyname = PRS_ALLOC_MEM( ps, char, name_length+1 )) )
 411                                 return False;
 412                 }
 413
 414                 if ( !prs_uint8s( True, "name", ps, depth, (uint8*)nk->keyname, name_length) )
 415                         return False;
 416
 417                 if ( UNMARSHALLING(ps) )
 418                         nk->keyname[name_length] = '\0';
 419         }
 420
 421         end_off = prs_offset( ps );
 422
 423         /* data_size must be divisible by 8 and large enough to hold the original record */
 424
 425         data_size = ((start_off - end_off) & 0xfffffff8 );
 426         if ( data_size > nk->rec_size )
 427                 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, nk->rec_size));
 428
 429         if ( MARSHALLING(ps) )
 430                 nk->hbin->dirty = True;
 431
 432         return True;
 433 }
 434
 435 /*******************************************************************
 436 *******************************************************************/
 437
 438 static uint32 regf_block_checksum( prs_struct *ps )
 439 {
 440         char *buffer = prs_data_p( ps );
 441         uint32 checksum, x;
 442         int i;
 443
 444         /* XOR of all bytes 0x0000 - 0x01FB */
 445
 446         checksum = x = 0;
 447
 448         for ( i=0; i<0x01FB; i+=4 ) {
 449                 x = IVAL(buffer, i );
 450                 checksum ^= x;
 451         }
 452
 453         return checksum;
 454 }
 455
 456 /*******************************************************************
 457 *******************************************************************/
 458
 459 static bool read_regf_block( REGF_FILE *file )
 460 {
 461         prs_struct ps;
 462         uint32 checksum;
 463
 464         /* grab the first block from the file */
 465
 466         if ( read_block( file, &ps, 0, REGF_BLOCKSIZE ) == -1 )
 467                 return False;
 468
 469         /* parse the block and verify the checksum */
 470
 471         if ( !prs_regf_block( "regf_header", &ps, 0, file ) )
 472                 return False;
 473
 474         checksum = regf_block_checksum( &ps );
 475
 476         prs_mem_free( &ps );
 477
 478         if ( file->checksum !=  checksum ) {
 479                 DEBUG(0,("read_regf_block: invalid checksum\n" ));
 480                 return False;
 481         }
 482
 483         return True;
 484 }
 485
 486 /*******************************************************************
 487 *******************************************************************/
 488
 489 static REGF_HBIN* read_hbin_block( REGF_FILE *file, off_t offset )
 490 {
 491         REGF_HBIN *hbin;
 492         uint32 record_size, curr_off, block_size, header;
 493
 494         if ( !(hbin = TALLOC_ZERO_P(file->mem_ctx, REGF_HBIN)) )
 495                 return NULL;
 496         hbin->file_off = offset;
 497         hbin->free_off = -1;
 498
 499         if ( read_block( file, &hbin->ps, offset, 0 ) == -1 )
 500                 return NULL;
 501
 502         if ( !prs_hbin_block( "hbin", &hbin->ps, 0, hbin ) )
 503                 return NULL;
 504
 505         /* this should be the same thing as hbin->block_size but just in case */
 506
 507         block_size = prs_data_size( &hbin->ps );
 508
 509         /* Find the available free space offset.  Always at the end,
 510            so walk the record list and stop when you get to the end.
 511            The end is defined by a record header of 0xffffffff.  The
 512            previous 4 bytes contains the amount of free space remaining
 513            in the hbin block. */
 514
 515         /* remember that the record_size is in the 4 bytes preceeding the record itself */
 516
 517         if ( !prs_set_offset( &hbin->ps, file->data_offset+HBIN_HDR_SIZE-sizeof(uint32) ) )
 518                 return False;
 519
 520         record_size = 0;
 521         header = 0;
 522         curr_off = prs_offset( &hbin->ps );
 523         while ( header != 0xffffffff ) {
 524                 /* not done yet so reset the current offset to the
 525                    next record_size field */
 526
 527                 curr_off = curr_off+record_size;
 528
 529                 /* for some reason the record_size of the last record in
 530                    an hbin block can extend past the end of the block
 531                    even though the record fits within the remaining
 532                    space....aaarrrgggghhhhhh */
 533
 534                 if ( curr_off >= block_size ) {
 535                         record_size = -1;
 536                         curr_off = -1;
 537                         break;
 538                 }
 539
 540                 if ( !prs_set_offset( &hbin->ps, curr_off) )
 541                         return False;
 542
 543                 if ( !prs_uint32( "rec_size", &hbin->ps, 0, &record_size ) )
 544                         return False;
 545                 if ( !prs_uint32( "header", &hbin->ps, 0, &header ) )
 546                         return False;
 547
 548                 SMB_ASSERT( record_size != 0 );
 549
 550                 if ( record_size & 0x80000000 ) {
 551                         /* absolute_value(record_size) */
 552                         record_size = (record_size ^ 0xffffffff) + 1;
 553                 }
 554         }
 555
 556         /* save the free space offset */
 557
 558         if ( header == 0xffffffff ) {
 559
 560                 /* account for the fact that the curr_off is 4 bytes behind the actual
 561                    record header */
 562
 563                 hbin->free_off = curr_off + sizeof(uint32);
 564                 hbin->free_size = record_size;
 565         }
 566
 567         DEBUG(10,("read_hbin_block: free space offset == 0x%x\n", hbin->free_off));
 568
 569         if ( !prs_set_offset( &hbin->ps, file->data_offset+HBIN_HDR_SIZE )  )
 570                 return False;
 571
 572         return hbin;
 573 }
 574
 575 /*******************************************************************
 576  Input a random offset and receive the corresponding HBIN
 577  block for it
 578 *******************************************************************/
 579
 580 static bool hbin_contains_offset( REGF_HBIN *hbin, uint32 offset )
 581 {
 582         if ( !hbin )
 583                 return False;
 584
 585         if ( (offset > hbin->first_hbin_off) && (offset < (hbin->first_hbin_off+hbin->block_size)) )
 586                 return True;
 587
 588         return False;
 589 }
 590
 591 /*******************************************************************
 592  Input a random offset and receive the corresponding HBIN
 593  block for it
 594 *******************************************************************/
 595
 596 static REGF_HBIN* lookup_hbin_block( REGF_FILE *file, uint32 offset )
 597 {
 598         REGF_HBIN *hbin = NULL;
 599         uint32 block_off;
 600
 601         /* start with the open list */
 602
 603         for ( hbin=file->block_list; hbin; hbin=hbin->next ) {
 604                 DEBUG(10,("lookup_hbin_block: address = 0x%x [0x%lx]\n", hbin->file_off, (unsigned long)hbin ));
 605                 if ( hbin_contains_offset( hbin, offset ) )
 606                         return hbin;
 607         }
 608
 609         if ( !hbin ) {
 610                 /* start at the beginning */
 611
 612                 block_off = REGF_BLOCKSIZE;
 613                 do {
 614                         /* cleanup before the next round */
 615                         if ( hbin )
 616                                 prs_mem_free( &hbin->ps );
 617
 618                         hbin = read_hbin_block( file, block_off );
 619
 620                         if ( hbin )
 621                                 block_off = hbin->file_off + hbin->block_size;
 622
 623                 } while ( hbin && !hbin_contains_offset( hbin, offset ) );
 624         }
 625
 626         if ( hbin )
 627                 DLIST_ADD( file->block_list, hbin );
 628
 629         return hbin;
 630 }
 631
 632 /*******************************************************************
 633 *******************************************************************/
 634
 635 static bool prs_hash_rec( const char *desc, prs_struct *ps, int depth, REGF_HASH_REC *hash )
 636 {
 637         prs_debug(ps, depth, desc, "prs_hash_rec");
 638         depth++;
 639
 640         if ( !prs_uint32( "nk_off", ps, depth, &hash->nk_off ))
 641                 return False;
 642         if ( !prs_uint8s( True, "keycheck", ps, depth, hash->keycheck, sizeof( hash->keycheck )) )
 643                 return False;
 644
 645         return True;
 646 }
 647
 648 /*******************************************************************
 649 *******************************************************************/
 650
 651 static bool hbin_prs_lf_records( const char *desc, REGF_HBIN *hbin, int depth, REGF_NK_REC *nk )
 652 {
 653         int i;
 654         REGF_LF_REC *lf = &nk->subkeys;
 655         uint32 data_size, start_off, end_off;
 656
 657         prs_debug(&hbin->ps, depth, desc, "prs_lf_records");
 658         depth++;
 659
 660         /* check if we have anything to do first */
 661
 662         if ( nk->num_subkeys == 0 )
 663                 return True;
 664
 665         /* move to the LF record */
 666
 667         if ( !prs_set_offset( &hbin->ps, nk->subkeys_off + HBIN_HDR_SIZE - hbin->first_hbin_off ) )
 668                 return False;
 669
 670         /* backup and get the data_size */
 671
 672         if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
 673                 return False;
 674         start_off = prs_offset( &hbin->ps );
 675         if ( !prs_uint32( "rec_size", &hbin->ps, depth, &lf->rec_size ))
 676                 return False;
 677
 678         if ( !prs_uint8s( True, "header", &hbin->ps, depth, (uint8*)lf->header, sizeof( lf->header )) )
 679                 return False;
 680
 681         if ( !prs_uint16( "num_keys", &hbin->ps, depth, &lf->num_keys))
 682                 return False;
 683
 684         if ( UNMARSHALLING(&hbin->ps) ) {
 685                 if (lf->num_keys) {
 686                         if ( !(lf->hashes = PRS_ALLOC_MEM( &hbin->ps, REGF_HASH_REC, lf->num_keys )) )
 687                                 return False;
 688                 } else {
 689                         lf->hashes = NULL;
 690                 }
 691         }
 692
 693         for ( i=0; i<lf->num_keys; i++ ) {
 694                 if ( !prs_hash_rec( "hash_rec", &hbin->ps, depth, &lf->hashes[i] ) )
 695                         return False;
 696         }
 697
 698         end_off = prs_offset( &hbin->ps );
 699
 700         /* data_size must be divisible by 8 and large enough to hold the original record */
 701
 702         data_size = ((start_off - end_off) & 0xfffffff8 );
 703         if ( data_size > lf->rec_size )
 704                 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, lf->rec_size));
 705
 706         if ( MARSHALLING(&hbin->ps) )
 707                 hbin->dirty = True;
 708
 709         return True;
 710 }
 711
 712 /*******************************************************************
 713 *******************************************************************/
 714
 715 static bool hbin_prs_sk_rec( const char *desc, REGF_HBIN *hbin, int depth, REGF_SK_REC *sk )
 716 {
 717         prs_struct *ps = &hbin->ps;
 718         uint16 tag = 0xFFFF;
 719         uint32 data_size, start_off, end_off;
 720
 721
 722         prs_debug(ps, depth, desc, "hbin_prs_sk_rec");
 723         depth++;
 724
 725         if ( !prs_set_offset( &hbin->ps, sk->sk_off + HBIN_HDR_SIZE - hbin->first_hbin_off ) )
 726                 return False;
 727
 728         /* backup and get the data_size */
 729
 730         if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
 731                 return False;
 732         start_off = prs_offset( &hbin->ps );
 733         if ( !prs_uint32( "rec_size", &hbin->ps, depth, &sk->rec_size ))
 734                 return False;
 735
 736         if ( !prs_uint8s( True, "header", ps, depth, (uint8*)sk->header, sizeof( sk->header )) )
 737                 return False;
 738         if ( !prs_uint16( "tag", ps, depth, &tag))
 739                 return False;
 740
 741         if ( !prs_uint32( "prev_sk_off", ps, depth, &sk->prev_sk_off))
 742                 return False;
 743         if ( !prs_uint32( "next_sk_off", ps, depth, &sk->next_sk_off))
 744                 return False;
 745         if ( !prs_uint32( "ref_count", ps, depth, &sk->ref_count))
 746                 return False;
 747         if ( !prs_uint32( "size", ps, depth, &sk->size))
 748                 return False;
 749
 750         {
 751                 NTSTATUS status;
 752                 TALLOC_CTX *mem_ctx = prs_get_mem_context(&hbin->ps);
 753                 DATA_BLOB blob;
 754
 755                 if (MARSHALLING(&hbin->ps)) {
 756                         status = marshall_sec_desc(mem_ctx,
 757                                                    sk->sec_desc,
 758                                                    &blob.data, &blob.length);
 759                         if (!NT_STATUS_IS_OK(status))
 760                                 return False;
 761                         if (!prs_copy_data_in(&hbin->ps, (const char *)blob.data, blob.length))
 762                                 return False;
 763                 } else {
 764                         blob = data_blob_const(prs_data_p(&hbin->ps),
 765                                                prs_data_size(&hbin->ps));
 766                         status = unmarshall_sec_desc(mem_ctx,
 767                                                      blob.data, blob.length,
 768                                                      &sk->sec_desc);
 769                         if (!NT_STATUS_IS_OK(status))
 770                                 return False;
 771                         prs_set_offset(&hbin->ps, blob.length);
 772                 }
 773         }
 774
 775         end_off = prs_offset( &hbin->ps );
 776
 777         /* data_size must be divisible by 8 and large enough to hold the original record */
 778
 779         data_size = ((start_off - end_off) & 0xfffffff8 );
 780         if ( data_size > sk->rec_size )
 781                 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, sk->rec_size));
 782
 783         if ( MARSHALLING(&hbin->ps) )
 784                 hbin->dirty = True;
 785
 786         return True;
 787 }
 788
 789 /*******************************************************************
 790 *******************************************************************/
 791
 792 static bool hbin_prs_vk_rec( const char *desc, REGF_HBIN *hbin, int depth, REGF_VK_REC *vk, REGF_FILE *file )
 793 {
 794         uint32 offset;
 795         uint16 name_length;
 796         prs_struct *ps = &hbin->ps;
 797         uint32 data_size, start_off, end_off;
 798
 799         prs_debug(ps, depth, desc, "prs_vk_rec");
 800         depth++;
 801
 802         /* backup and get the data_size */
 803
 804         if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32)) )
 805                 return False;
 806         start_off = prs_offset( &hbin->ps );
 807         if ( !prs_uint32( "rec_size", &hbin->ps, depth, &vk->rec_size ))
 808                 return False;
 809
 810         if ( !prs_uint8s( True, "header", ps, depth, (uint8*)vk->header, sizeof( vk->header )) )
 811                 return False;
 812
 813         if ( MARSHALLING(&hbin->ps) )
 814                 name_length = strlen(vk->valuename);
 815
 816         if ( !prs_uint16( "name_length", ps, depth, &name_length ))
 817                 return False;
 818         if ( !prs_uint32( "data_size", ps, depth, &vk->data_size ))
 819                 return False;
 820         if ( !prs_uint32( "data_off", ps, depth, &vk->data_off ))
 821                 return False;
 822         if ( !prs_uint32( "type", ps, depth, &vk->type))
 823                 return False;
 824         if ( !prs_uint16( "flag", ps, depth, &vk->flag))
 825                 return False;
 826
 827         offset = prs_offset( ps );
 828         offset += 2;    /* skip 2 bytes */
 829         prs_set_offset( ps, offset );
 830
 831         /* get the name */
 832
 833         if ( vk->flag&VK_FLAG_NAME_PRESENT ) {
 834
 835                 if ( UNMARSHALLING(&hbin->ps) ) {
 836                         if ( !(vk->valuename = PRS_ALLOC_MEM( ps, char, name_length+1 )))
 837                                 return False;
 838                 }
 839                 if ( !prs_uint8s( True, "name", ps, depth, (uint8*)vk->valuename, name_length ) )
 840                         return False;
 841         }
 842
 843         end_off = prs_offset( &hbin->ps );
 844
 845         /* get the data if necessary */
 846
 847         if ( vk->data_size != 0 ) {
 848                 bool charmode = False;
 849
 850                 if ( (vk->type == REG_SZ) || (vk->type == REG_MULTI_SZ) )
 851                         charmode = True;
 852
 853                 /* the data is stored in the offset if the size <= 4 */
 854
 855                 if ( !(vk->data_size & VK_DATA_IN_OFFSET) ) {
 856                         REGF_HBIN *hblock = hbin;
 857                         uint32 data_rec_size;
 858
 859                         if ( UNMARSHALLING(&hbin->ps) ) {
 860                                 if ( !(vk->data = PRS_ALLOC_MEM( ps, uint8, vk->data_size) ) )
 861                                         return False;
 862                         }
 863
 864                         /* this data can be in another hbin */
 865                         if ( !hbin_contains_offset( hbin, vk->data_off ) ) {
 866                                 if ( !(hblock = lookup_hbin_block( file, vk->data_off )) )
 867                                         return False;
 868                         }
 869                         if ( !(prs_set_offset( &hblock->ps, (vk->data_off+HBIN_HDR_SIZE-hblock->first_hbin_off)-sizeof(uint32) )) )
 870                                 return False;
 871
 872                         if ( MARSHALLING(&hblock->ps) ) {
 873                                 data_rec_size = ( (vk->data_size+sizeof(uint32)) & 0xfffffff8 ) + 8;
 874                                 data_rec_size = ( data_rec_size - 1 ) ^ 0xFFFFFFFF;
 875                         }
 876                         if ( !prs_uint32( "data_rec_size", &hblock->ps, depth, &data_rec_size ))
 877                                 return False;
 878                         if ( !prs_uint8s( charmode, "data", &hblock->ps, depth, vk->data, vk->data_size) )
 879                                 return False;
 880
 881                         if ( MARSHALLING(&hblock->ps) )
 882                                 hblock->dirty = True;
 883                 }
 884                 else {
 885                         if ( !(vk->data = PRS_ALLOC_MEM( ps, uint8, 4 ) ) )
 886                                 return False;
 887                         SIVAL( vk->data, 0, vk->data_off );
 888                 }
 889
 890         }
 891
 892         /* data_size must be divisible by 8 and large enough to hold the original record */
 893
 894         data_size = ((start_off - end_off ) & 0xfffffff8 );
 895         if ( data_size !=  vk->rec_size )
 896                 DEBUG(10,("prs_vk_rec: data_size check failed (0x%x < 0x%x)\n", data_size, vk->rec_size));
 897
 898         if ( MARSHALLING(&hbin->ps) )
 899                 hbin->dirty = True;
 900
 901         return True;
 902 }
 903
 904 /*******************************************************************
 905  read a VK record which is contained in the HBIN block stored
 906  in the prs_struct *ps.
 907 *******************************************************************/
 908
 909 static bool hbin_prs_vk_records( const char *desc, REGF_HBIN *hbin, int depth, REGF_NK_REC *nk, REGF_FILE *file )
 910 {
 911         int i;
 912         uint32 record_size;
 913
 914         prs_debug(&hbin->ps, depth, desc, "prs_vk_records");
 915         depth++;
 916
 917         /* check if we have anything to do first */
 918
 919         if ( nk->num_values == 0 )
 920                 return True;
 921
 922         if ( UNMARSHALLING(&hbin->ps) ) {
 923                 if ( !(nk->values = PRS_ALLOC_MEM( &hbin->ps, REGF_VK_REC, nk->num_values ) ) )
 924                         return False;
 925         }
 926
 927         /* convert the offset to something relative to this HBIN block */
 928
 929         if ( !prs_set_offset( &hbin->ps, nk->values_off+HBIN_HDR_SIZE-hbin->first_hbin_off-sizeof(uint32)) )
 930                 return False;
 931
 932         if ( MARSHALLING( &hbin->ps) ) {
 933                 record_size = ( ( nk->num_values * sizeof(uint32) ) & 0xfffffff8 ) + 8;
 934                 record_size = (record_size - 1) ^ 0xFFFFFFFF;
 935         }
 936
 937         if ( !prs_uint32( "record_size", &hbin->ps, depth, &record_size ) )
 938                 return False;
 939
 940         for ( i=0; i<nk->num_values; i++ ) {
 941                 if ( !prs_uint32( "vk_off", &hbin->ps, depth, &nk->values[i].rec_off ) )
 942                         return False;
 943         }
 944
 945         for ( i=0; i<nk->num_values; i++ ) {
 946                 REGF_HBIN *sub_hbin = hbin;
 947                 uint32 new_offset;
 948
 949                 if ( !hbin_contains_offset( hbin, nk->values[i].rec_off ) ) {
 950                         sub_hbin = lookup_hbin_block( file, nk->values[i].rec_off );
 951                         if ( !sub_hbin ) {
 952                                 DEBUG(0,("hbin_prs_vk_records: Failed to find HBIN block containing offset [0x%x]\n",
 953                                         nk->values[i].hbin_off));
 954                                 return False;
 955                         }
 956                 }
 957
 958                 new_offset = nk->values[i].rec_off + HBIN_HDR_SIZE - sub_hbin->first_hbin_off;
 959                 if ( !prs_set_offset( &sub_hbin->ps, new_offset ) )
 960                         return False;
 961                 if ( !hbin_prs_vk_rec( "vk_rec", sub_hbin, depth, &nk->values[i], file ) )
 962                         return False;
 963         }
 964
 965         if ( MARSHALLING(&hbin->ps) )
 966                 hbin->dirty = True;
 967
 968
 969         return True;
 970 }
 971
 972
 973 /*******************************************************************
 974 *******************************************************************/
 975
 976 static REGF_SK_REC* find_sk_record_by_offset( REGF_FILE *file, uint32 offset )
 977 {
 978         REGF_SK_REC *p_sk;
 979
 980         for ( p_sk=file->sec_desc_list; p_sk; p_sk=p_sk->next ) {
 981                 if ( p_sk->sk_off == offset )
 982                         return p_sk;
 983         }
 984
 985         return NULL;
 986 }
 987
 988 /*******************************************************************
 989 *******************************************************************/
 990
 991 static REGF_SK_REC* find_sk_record_by_sec_desc( REGF_FILE *file, struct security_descriptor *sd )
 992 {
 993         REGF_SK_REC *p;
 994
 995         for ( p=file->sec_desc_list; p; p=p->next ) {
 996                 if ( security_descriptor_equal( p->sec_desc, sd ) )
 997                         return p;
 998         }
 999
1000         /* failure */
1001
1002         return NULL;
1003 }
1004
1005 /*******************************************************************
1006 *******************************************************************/
1007
1008 static bool hbin_prs_key( REGF_FILE *file, REGF_HBIN *hbin, REGF_NK_REC *nk )
1009 {
1010         int depth = 0;
1011         REGF_HBIN *sub_hbin;
1012
1013         prs_debug(&hbin->ps, depth, "", "fetch_key");
1014         depth++;
1015
1016         /* get the initial nk record */
1017
1018         if ( !prs_nk_rec( "nk_rec", &hbin->ps, depth, nk ))
1019                 return False;
1020
1021         /* fill in values */
1022
1023         if ( nk->num_values && (nk->values_off!=REGF_OFFSET_NONE) ) {
1024                 sub_hbin = hbin;
1025                 if ( !hbin_contains_offset( hbin, nk->values_off ) ) {
1026                         sub_hbin = lookup_hbin_block( file, nk->values_off );
1027                         if ( !sub_hbin ) {
1028                                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing value_list_offset [0x%x]\n",
1029                                         nk->values_off));
1030                                 return False;
1031                         }
1032                 }
1033
1034                 if ( !hbin_prs_vk_records( "vk_rec", sub_hbin, depth, nk, file ))
1035                         return False;
1036         }
1037
1038         /* now get subkeys */
1039
1040         if ( nk->num_subkeys && (nk->subkeys_off!=REGF_OFFSET_NONE) ) {
1041                 sub_hbin = hbin;
1042                 if ( !hbin_contains_offset( hbin, nk->subkeys_off ) ) {
1043                         sub_hbin = lookup_hbin_block( file, nk->subkeys_off );
1044                         if ( !sub_hbin ) {
1045                                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing subkey_offset [0x%x]\n",
1046                                         nk->subkeys_off));
1047                                 return False;
1048                         }
1049                 }
1050
1051                 if ( !hbin_prs_lf_records( "lf_rec", sub_hbin, depth, nk ))
1052                         return False;
1053         }
1054
1055         /* get the to the security descriptor.  First look if we have already parsed it */
1056
1057         if ( (nk->sk_off!=REGF_OFFSET_NONE) && !( nk->sec_desc = find_sk_record_by_offset( file, nk->sk_off )) ) {
1058
1059                 sub_hbin = hbin;
1060                 if ( !hbin_contains_offset( hbin, nk->sk_off ) ) {
1061                         sub_hbin = lookup_hbin_block( file, nk->sk_off );
1062                         if ( !sub_hbin ) {
1063                                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing sk_offset [0x%x]\n",
1064                                         nk->subkeys_off));
1065                                 return False;
1066                         }
1067                 }
1068
1069                 if ( !(nk->sec_desc = TALLOC_ZERO_P( file->mem_ctx, REGF_SK_REC )) )
1070                         return False;
1071                 nk->sec_desc->sk_off = nk->sk_off;
1072                 if ( !hbin_prs_sk_rec( "sk_rec", sub_hbin, depth, nk->sec_desc ))
1073                         return False;
1074
1075                 /* add to the list of security descriptors (ref_count has been read from the files) */
1076
1077                 nk->sec_desc->sk_off = nk->sk_off;
1078                 DLIST_ADD( file->sec_desc_list, nk->sec_desc );
1079         }
1080
1081         return True;
1082 }
1083
1084 /*******************************************************************
1085 *******************************************************************/
1086
1087 static bool next_record( REGF_HBIN *hbin, const char *hdr, bool *eob )
1088 {
1089         uint8 header[REC_HDR_SIZE];
1090         uint32 record_size;
1091         uint32 curr_off, block_size;
1092         bool found = False;
1093         prs_struct *ps = &hbin->ps;
1094
1095         curr_off = prs_offset( ps );
1096         if ( curr_off == 0 )
1097                 prs_set_offset( ps, HBIN_HEADER_REC_SIZE );
1098
1099         /* assume that the current offset is at the record header
1100            and we need to backup to read the record size */
1101
1102         curr_off -= sizeof(uint32);
1103
1104         block_size = prs_data_size( ps );
1105         record_size = 0;
1106         memset( header, 0x0, sizeof(uint8)*REC_HDR_SIZE );
1107         while ( !found ) {
1108
1109                 curr_off = curr_off+record_size;
1110                 if ( curr_off >= block_size )
1111                         break;
1112
1113                 if ( !prs_set_offset( &hbin->ps, curr_off) )
1114                         return False;
1115
1116                 if ( !prs_uint32( "record_size", ps, 0, &record_size ) )
1117                         return False;
1118                 if ( !prs_uint8s( True, "header", ps, 0, header, REC_HDR_SIZE ) )
1119                         return False;
1120
1121                 if ( record_size & 0x80000000 ) {
1122                         /* absolute_value(record_size) */
1123                         record_size = (record_size ^ 0xffffffff) + 1;
1124                 }
1125
1126                 if ( memcmp( header, hdr, REC_HDR_SIZE ) == 0 ) {
1127                         found = True;
1128                         curr_off += sizeof(uint32);
1129                 }
1130         }
1131
1132         /* mark prs_struct as done ( at end ) if no more SK records */
1133         /* mark end-of-block as True */
1134
1135         if ( !found ) {
1136                 prs_set_offset( &hbin->ps, prs_data_size(&hbin->ps) );
1137                 *eob = True;
1138                 return False;
1139         }
1140
1141         if ( !prs_set_offset( ps, curr_off ) )
1142                 return False;
1143
1144         return True;
1145 }
1146
1147 /*******************************************************************
1148 *******************************************************************/
1149
1150 static bool next_nk_record( REGF_FILE *file, REGF_HBIN *hbin, REGF_NK_REC *nk, bool *eob )
1151 {
1152         if ( next_record( hbin, "nk", eob ) && hbin_prs_key( file, hbin, nk ) )
1153                 return True;
1154
1155         return False;
1156 }
1157
1158 /*******************************************************************
1159  Intialize the newly created REGF_BLOCK in *file and write the
1160  block header to disk
1161 *******************************************************************/
1162
1163 static bool init_regf_block( REGF_FILE *file )
1164 {
1165         prs_struct ps;
1166         bool result = True;
1167
1168         if ( !prs_init( &ps, REGF_BLOCKSIZE, file->mem_ctx, MARSHALL ) )
1169                 return False;
1170
1171         memcpy( file->header, "regf", REGF_HDR_SIZE );
1172         file->data_offset = 0x20;
1173         file->last_block  = 0x1000;
1174
1175         /* set mod time */
1176
1177         unix_to_nt_time( &file->mtime, time(NULL) );
1178
1179         /* hard coded values...no diea what these are ... maybe in time */
1180
1181         file->unknown1 = 0x2;
1182         file->unknown2 = 0x1;
1183         file->unknown3 = 0x3;
1184         file->unknown4 = 0x0;
1185         file->unknown5 = 0x1;
1186         file->unknown6 = 0x1;
1187
1188         /* write header to the buffer */
1189
1190         if ( !prs_regf_block( "regf_header", &ps, 0, file ) ) {
1191                 result = False;
1192                 goto out;
1193         }
1194
1195         /* calculate the checksum, re-marshall data (to include the checksum)
1196            and write to disk */
1197
1198         file->checksum = regf_block_checksum( &ps );
1199         prs_set_offset( &ps, 0 );
1200         if ( !prs_regf_block( "regf_header", &ps, 0, file ) ) {
1201                 result = False;
1202                 goto out;
1203         }
1204
1205         if ( write_block( file, &ps, 0 ) == -1 ) {
1206                 DEBUG(0,("init_regf_block: Failed to initialize registry header block!\n"));
1207                 result = False;
1208                 goto out;
1209         }
1210
1211 out:
1212         prs_mem_free( &ps );
1213
1214         return result;
1215 }
1216 /*******************************************************************
1217  Open the registry file and then read in the REGF block to get the
1218  first hbin offset.
1219 *******************************************************************/
1220
1221  REGF_FILE* regfio_open( const char *filename, int flags, int mode )
1222 {
1223         REGF_FILE *rb;
1224
1225         if ( !(rb = SMB_MALLOC_P(REGF_FILE)) ) {
1226                 DEBUG(0,("ERROR allocating memory\n"));
1227                 return NULL;
1228         }
1229         ZERO_STRUCTP( rb );
1230         rb->fd = -1;
1231
1232         if ( !(rb->mem_ctx = talloc_init( "read_regf_block" )) ) {
1233                 regfio_close( rb );
1234                 return NULL;
1235         }
1236
1237         rb->open_flags = flags;
1238
1239         /* open and existing file */
1240
1241         if ( (rb->fd = open(filename, flags, mode)) == -1 ) {
1242                 DEBUG(0,("regfio_open: failure to open %s (%s)\n", filename, strerror(errno)));
1243                 regfio_close( rb );
1244                 return NULL;
1245         }
1246
1247         /* check if we are creating a new file or overwriting an existing one */
1248
1249         if ( flags & (O_CREAT|O_TRUNC) ) {
1250                 if ( !init_regf_block( rb ) ) {
1251                         DEBUG(0,("regfio_open: Failed to read initial REGF block\n"));
1252                         regfio_close( rb );
1253                         return NULL;
1254                 }
1255
1256                 /* success */
1257                 return rb;
1258         }
1259
1260         /* read in an existing file */
1261
1262         if ( !read_regf_block( rb ) ) {
1263                 DEBUG(0,("regfio_open: Failed to read initial REGF block\n"));
1264                 regfio_close( rb );
1265                 return NULL;
1266         }
1267
1268         /* success */
1269
1270         return rb;
1271 }
1272
1273 /*******************************************************************
1274 *******************************************************************/
1275
1276 static void regfio_mem_free( REGF_FILE *file )
1277 {
1278         /* free any talloc()'d memory */
1279
1280         if ( file && file->mem_ctx )
1281                 talloc_destroy( file->mem_ctx );
1282 }
1283
1284 /*******************************************************************
1285 *******************************************************************/
1286
1287  int regfio_close( REGF_FILE *file )
1288 {
1289         int fd;
1290
1291         /* cleanup for a file opened for write */
1292
1293         if ((file->fd != -1) && (file->open_flags & (O_WRONLY|O_RDWR))) {
1294                 prs_struct ps;
1295                 REGF_SK_REC *sk;
1296
1297                 /* write of sd list */
1298
1299                 for ( sk=file->sec_desc_list; sk; sk=sk->next ) {
1300                         hbin_prs_sk_rec( "sk_rec", sk->hbin, 0, sk );
1301                 }
1302
1303                 /* flush any dirty blocks */
1304
1305                 while ( file->block_list ) {
1306                         hbin_block_close( file, file->block_list );
1307                 }
1308
1309                 ZERO_STRUCT( ps );
1310
1311                 unix_to_nt_time( &file->mtime, time(NULL) );
1312
1313                 if ( read_block( file, &ps, 0, REGF_BLOCKSIZE ) != -1 ) {
1314                         /* now use for writing */
1315                         prs_switch_type( &ps, MARSHALL );
1316
1317                         /* stream the block once, generate the checksum,
1318                            and stream it again */
1319                         prs_set_offset( &ps, 0 );
1320                         prs_regf_block( "regf_blocK", &ps, 0, file );
1321                         file->checksum = regf_block_checksum( &ps );
1322                         prs_set_offset( &ps, 0 );
1323                         prs_regf_block( "regf_blocK", &ps, 0, file );
1324
1325                         /* now we are ready to write it to disk */
1326                         if ( write_block( file, &ps, 0 ) == -1 )
1327                                 DEBUG(0,("regfio_close: failed to update the regf header block!\n"));
1328                 }
1329
1330                 prs_mem_free( &ps );
1331         }
1332
1333         regfio_mem_free( file );
1334
1335         /* nothing tdo do if there is no open file */
1336
1337         if (file->fd == -1)
1338                 return 0;
1339
1340         fd = file->fd;
1341         file->fd = -1;
1342         SAFE_FREE( file );
1343
1344         return close( fd );
1345 }
1346
1347 /*******************************************************************
1348 *******************************************************************/
1349
1350 static void regfio_flush( REGF_FILE *file )
1351 {
1352         REGF_HBIN *hbin;
1353
1354         for ( hbin=file->block_list; hbin; hbin=hbin->next ) {
1355                 write_hbin_block( file, hbin );
1356         }
1357 }
1358
1359 /*******************************************************************
1360  There should be only *one* root key in the registry file based
1361  on my experience.  --jerry
1362 *******************************************************************/
1363
1364 REGF_NK_REC* regfio_rootkey( REGF_FILE *file )
1365 {
1366         REGF_NK_REC *nk;
1367         REGF_HBIN   *hbin;
1368         uint32      offset = REGF_BLOCKSIZE;
1369         bool        found = False;
1370         bool        eob;
1371
1372         if ( !file )
1373                 return NULL;
1374
1375         if ( !(nk = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) ) {
1376                 DEBUG(0,("regfio_rootkey: talloc() failed!\n"));
1377                 return NULL;
1378         }
1379
1380         /* scan through the file on HBIN block at a time looking
1381            for an NK record with a type == 0x002c.
1382            Normally this is the first nk record in the first hbin
1383            block (but I'm not assuming that for now) */
1384
1385         while ( (hbin = read_hbin_block( file, offset )) ) {
1386                 eob = False;
1387
1388                 while ( !eob) {
1389                         if ( next_nk_record( file, hbin, nk, &eob ) ) {
1390                                 if ( nk->key_type == NK_TYPE_ROOTKEY ) {
1391                                         found = True;
1392                                         break;
1393                                 }
1394                         }
1395                         prs_mem_free( &hbin->ps );
1396                 }
1397
1398                 if ( found )
1399                         break;
1400
1401                 offset += hbin->block_size;
1402         }
1403
1404         if ( !found ) {
1405                 DEBUG(0,("regfio_rootkey: corrupt registry file ?  No root key record located\n"));
1406                 return NULL;
1407         }
1408
1409         DLIST_ADD( file->block_list, hbin );
1410
1411         return nk;
1412 }
1413
1414 /*******************************************************************
1415  This acts as an interator over the subkeys defined for a given
1416  NK record.  Remember that offsets are from the *first* HBIN block.
1417 *******************************************************************/
1418
1419  REGF_NK_REC* regfio_fetch_subkey( REGF_FILE *file, REGF_NK_REC *nk )
1420 {
1421         REGF_NK_REC *subkey;
1422         REGF_HBIN   *hbin;
1423         uint32      nk_offset;
1424
1425         /* see if there is anything left to report */
1426
1427         if ( !nk || (nk->subkeys_off==REGF_OFFSET_NONE) || (nk->subkey_index >= nk->num_subkeys) )
1428                 return NULL;
1429
1430         /* find the HBIN block which should contain the nk record */
1431
1432         if ( !(hbin = lookup_hbin_block( file, nk->subkeys.hashes[nk->subkey_index].nk_off )) ) {
1433                 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing offset [0x%x]\n",
1434                         nk->subkeys.hashes[nk->subkey_index].nk_off));
1435                 return NULL;
1436         }
1437
1438         nk_offset = nk->subkeys.hashes[nk->subkey_index].nk_off;
1439         if ( !prs_set_offset( &hbin->ps, (HBIN_HDR_SIZE + nk_offset - hbin->first_hbin_off) ) )
1440                 return NULL;
1441
1442         nk->subkey_index++;
1443         if ( !(subkey = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) )
1444                 return NULL;
1445
1446         if ( !hbin_prs_key( file, hbin, subkey ) )
1447                 return NULL;
1448
1449         return subkey;
1450 }
1451
1452
1453 /*******************************************************************
1454 *******************************************************************/
1455
1456 static REGF_HBIN* regf_hbin_allocate( REGF_FILE *file, uint32 block_size )
1457 {
1458         REGF_HBIN *hbin;
1459         SMB_STRUCT_STAT sbuf;
1460
1461         if ( !(hbin = TALLOC_ZERO_P( file->mem_ctx, REGF_HBIN )) )
1462                 return NULL;
1463
1464         memcpy( hbin->header, "hbin", sizeof(HBIN_HDR_SIZE) );
1465
1466
1467         if (sys_fstat(file->fd, &sbuf, false)) {
1468                 DEBUG(0,("regf_hbin_allocate: stat() failed! (%s)\n", strerror(errno)));
1469                 return NULL;
1470         }
1471
1472         hbin->file_off       = sbuf.st_ex_size;
1473
1474         hbin->free_off       = HBIN_HEADER_REC_SIZE;
1475         hbin->free_size      = block_size - hbin->free_off + sizeof(uint32);;
1476
1477         hbin->block_size     = block_size;
1478         hbin->first_hbin_off = hbin->file_off - REGF_BLOCKSIZE;
1479
1480         if ( !prs_init( &hbin->ps, block_size, file->mem_ctx, MARSHALL ) )
1481                 return NULL;
1482
1483         if ( !prs_hbin_block( "new_hbin", &hbin->ps, 0, hbin ) )
1484                 return NULL;
1485
1486         if ( !write_hbin_block( file, hbin ) )
1487                 return NULL;
1488
1489         file->last_block = hbin->file_off;
1490
1491         return hbin;
1492 }
1493
1494 /*******************************************************************
1495 *******************************************************************/
1496
1497 static void update_free_space( REGF_HBIN *hbin, uint32 size_used )
1498 {
1499         hbin->free_off  += size_used;
1500         hbin->free_size -= size_used;
1501
1502         if ( hbin->free_off >= hbin->block_size ) {
1503                 hbin->free_off = REGF_OFFSET_NONE;
1504         }
1505
1506         return;
1507 }
1508
1509 /*******************************************************************
1510 *******************************************************************/
1511
1512 static REGF_HBIN* find_free_space( REGF_FILE *file, uint32 size )
1513 {
1514         REGF_HBIN *hbin, *p_hbin;
1515         uint32 block_off;
1516         bool cached;
1517
1518         /* check open block list */
1519
1520         for ( hbin=file->block_list; hbin!=NULL; hbin=hbin->next ) {
1521                 /* only check blocks that actually have available space */
1522
1523                 if ( hbin->free_off == REGF_OFFSET_NONE )
1524                         continue;
1525
1526                 /* check for a large enough available chunk */
1527
1528                 if ( (hbin->block_size - hbin->free_off) >= size ) {
1529                         DLIST_PROMOTE( file->block_list, hbin );
1530                         goto done;
1531                 }
1532         }
1533
1534         /* parse the file until we find a block with
1535            enough free space; save the last non-filled hbin */
1536
1537         block_off = REGF_BLOCKSIZE;
1538         do {
1539                 /* cleanup before the next round */
1540                 cached = False;
1541                 if ( hbin )
1542                         prs_mem_free( &hbin->ps );
1543
1544                 hbin = read_hbin_block( file, block_off );
1545
1546                 if ( hbin ) {
1547
1548                         /* make sure that we don't already have this block in memory */
1549
1550                         for ( p_hbin=file->block_list; p_hbin!=NULL; p_hbin=p_hbin->next ) {
1551                                 if ( p_hbin->file_off == hbin->file_off ) {
1552                                         cached = True;
1553                                         break;
1554                                 }
1555                         }
1556
1557                         block_off = hbin->file_off + hbin->block_size;
1558
1559                         if ( cached ) {
1560                                 prs_mem_free( &hbin->ps );
1561                                 hbin = NULL;
1562                                 continue;
1563                         }
1564                 }
1565         /* if (cached block or (new block and not enough free space)) then continue looping */
1566         } while ( cached || (hbin && (hbin->free_size < size)) );
1567
1568         /* no free space; allocate a new one */
1569
1570         if ( !hbin ) {
1571                 uint32 alloc_size;
1572
1573                 /* allocate in multiples of REGF_ALLOC_BLOCK; make sure (size + hbin_header) fits */
1574
1575                 alloc_size = (((size+HBIN_HEADER_REC_SIZE) / REGF_ALLOC_BLOCK ) + 1 ) * REGF_ALLOC_BLOCK;
1576
1577                 if ( !(hbin = regf_hbin_allocate( file, alloc_size )) ) {
1578                         DEBUG(0,("find_free_space: regf_hbin_allocate() failed!\n"));
1579                         return NULL;
1580                 }
1581                 DLIST_ADD( file->block_list, hbin );
1582         }
1583
1584 done:
1585         /* set the offset to be ready to write */
1586
1587         if ( !prs_set_offset( &hbin->ps, hbin->free_off-sizeof(uint32) ) )
1588                 return NULL;
1589
1590         /* write the record size as a placeholder for now, it should be
1591            probably updated by the caller once it all of the data necessary
1592            for the record */
1593
1594         if ( !prs_uint32("allocated_size", &hbin->ps, 0, &size) )
1595                 return False;
1596
1597         update_free_space( hbin, size );
1598
1599         return hbin;
1600 }
1601
1602 /*******************************************************************
1603 *******************************************************************/
1604
1605 static uint32 sk_record_data_size( struct security_descriptor * sd )
1606 {
1607         uint32 size, size_mod8;
1608
1609         size_mod8 = 0;
1610
1611         /* the record size is sizeof(hdr) + name + static members + data_size_field */
1612
1613         size = sizeof(uint32)*5 + ndr_size_security_descriptor(sd, 0) + sizeof(uint32);
1614
1615         /* multiple of 8 */
1616         size_mod8 = size & 0xfffffff8;
1617         if ( size_mod8 < size )
1618                 size_mod8 += 8;
1619
1620         return size_mod8;
1621 }
1622
1623 /*******************************************************************
1624 *******************************************************************/
1625
1626 static uint32 vk_record_data_size( REGF_VK_REC *vk )
1627 {
1628         uint32 size, size_mod8;
1629
1630         size_mod8 = 0;
1631
1632         /* the record size is sizeof(hdr) + name + static members + data_size_field */
1633
1634         size = REC_HDR_SIZE + (sizeof(uint16)*3) + (sizeof(uint32)*3) + sizeof(uint32);
1635
1636         if ( vk->valuename )
1637                 size += strlen(vk->valuename);
1638
1639         /* multiple of 8 */
1640         size_mod8 = size & 0xfffffff8;
1641         if ( size_mod8 < size )
1642                 size_mod8 += 8;
1643
1644         return size_mod8;
1645 }
1646
1647 /*******************************************************************
1648 *******************************************************************/
1649
1650 static uint32 lf_record_data_size( uint32 num_keys )
1651 {
1652         uint32 size, size_mod8;
1653
1654         size_mod8 = 0;
1655
1656         /* the record size is sizeof(hdr) + num_keys + sizeof of hash_array + data_size_uint32 */
1657
1658         size = REC_HDR_SIZE + sizeof(uint16) + (sizeof(REGF_HASH_REC) * num_keys) + sizeof(uint32);
1659
1660         /* multiple of 8 */
1661         size_mod8 = size & 0xfffffff8;
1662         if ( size_mod8 < size )
1663                 size_mod8 += 8;
1664
1665         return size_mod8;
1666 }
1667
1668 /*******************************************************************
1669 *******************************************************************/
1670
1671 static uint32 nk_record_data_size( REGF_NK_REC *nk )
1672 {
1673         uint32 size, size_mod8;
1674
1675         size_mod8 = 0;
1676
1677         /* the record size is static + length_of_keyname + length_of_classname + data_size_uint32 */
1678
1679         size = 0x4c + strlen(nk->keyname) + sizeof(uint32);
1680
1681         if ( nk->classname )
1682                 size += strlen( nk->classname );
1683
1684         /* multiple of 8 */
1685         size_mod8 = size & 0xfffffff8;
1686         if ( size_mod8 < size )
1687                 size_mod8 += 8;
1688
1689         return size_mod8;
1690 }
1691
1692 /*******************************************************************
1693 *******************************************************************/
1694
1695 static bool create_vk_record(REGF_FILE *file, REGF_VK_REC *vk,
1696                              struct regval_blob *value)
1697 {
1698         char *name = regval_name(value);
1699         REGF_HBIN *data_hbin;
1700
1701         ZERO_STRUCTP( vk );
1702
1703         memcpy( vk->header, "vk", REC_HDR_SIZE );
1704
1705         if ( name ) {
1706                 vk->valuename = talloc_strdup( file->mem_ctx, regval_name(value) );
1707                 vk->flag = VK_FLAG_NAME_PRESENT;
1708         }
1709
1710         vk->data_size = regval_size( value );
1711         vk->type      = regval_type( value );
1712
1713         if ( vk->data_size > sizeof(uint32) ) {
1714                 uint32 data_size = ( (vk->data_size+sizeof(uint32)) & 0xfffffff8 ) + 8;
1715
1716                 vk->data = (uint8 *)TALLOC_MEMDUP( file->mem_ctx,
1717                                                    regval_data_p(value),
1718                                                    vk->data_size );
1719                 if (vk->data == NULL) {
1720                         return False;
1721                 }
1722
1723                 /* go ahead and store the offset....we'll pick this hbin block back up when
1724                    we stream the data */
1725
1726                 if ((data_hbin = find_free_space(file, data_size )) == NULL) {
1727                         return False;
1728                 }
1729                 vk->data_off = prs_offset( &data_hbin->ps ) + data_hbin->first_hbin_off - HBIN_HDR_SIZE;
1730         }
1731         else {
1732                 /* make sure we don't try to copy from a NULL value pointer */
1733
1734                 if ( vk->data_size != 0 )
1735                         memcpy( &vk->data_off, regval_data_p(value), sizeof(uint32) );
1736                 vk->data_size |= VK_DATA_IN_OFFSET;
1737         }
1738
1739         return True;
1740 }
1741
1742 /*******************************************************************
1743 *******************************************************************/
1744
1745 static int hashrec_cmp( REGF_HASH_REC *h1, REGF_HASH_REC *h2 )
1746 {
1747         return StrCaseCmp( h1->fullname, h2->fullname );
1748 }
1749
1750 /*******************************************************************
1751 *******************************************************************/
1752
1753  REGF_NK_REC* regfio_write_key( REGF_FILE *file, const char *name,
1754                                struct regval_ctr *values, struct regsubkey_ctr *subkeys,
1755                                struct security_descriptor *sec_desc, REGF_NK_REC *parent )
1756 {
1757         REGF_NK_REC *nk;
1758         REGF_HBIN *vlist_hbin = NULL;
1759         uint32 size;
1760
1761         if ( !(nk = TALLOC_ZERO_P( file->mem_ctx, REGF_NK_REC )) )
1762                 return NULL;
1763
1764         memcpy( nk->header, "nk", REC_HDR_SIZE );
1765
1766         if ( !parent )
1767                 nk->key_type = NK_TYPE_ROOTKEY;
1768         else
1769                 nk->key_type = NK_TYPE_NORMALKEY;
1770
1771         /* store the parent offset (or -1 if a the root key */
1772
1773         nk->parent_off = parent ? (parent->hbin_off + parent->hbin->file_off - REGF_BLOCKSIZE - HBIN_HDR_SIZE ) : REGF_OFFSET_NONE;
1774
1775         /* no classname currently */
1776
1777         nk->classname_off = REGF_OFFSET_NONE;
1778         nk->classname = NULL;
1779         nk->keyname = talloc_strdup( file->mem_ctx, name );
1780
1781         /* current modification time */
1782
1783         unix_to_nt_time( &nk->mtime, time(NULL) );
1784
1785         /* allocate the record on disk */
1786
1787         size = nk_record_data_size( nk );
1788         nk->rec_size = ( size - 1 ) ^ 0XFFFFFFFF;
1789         if ((nk->hbin = find_free_space( file, size )) == NULL) {
1790                 return NULL;
1791         }
1792         nk->hbin_off = prs_offset( &nk->hbin->ps );
1793
1794         /* Update the hash record in the parent */
1795
1796         if ( parent ) {
1797                 REGF_HASH_REC *hash = &parent->subkeys.hashes[parent->subkey_index];
1798
1799                 hash->nk_off = prs_offset( &nk->hbin->ps ) + nk->hbin->first_hbin_off - HBIN_HDR_SIZE;
1800                 memcpy( hash->keycheck, name, sizeof(uint32) );
1801                 hash->fullname = talloc_strdup( file->mem_ctx, name );
1802                 parent->subkey_index++;
1803
1804                 /* sort the list by keyname */
1805                 TYPESAFE_QSORT(parent->subkeys.hashes, parent->subkey_index, hashrec_cmp);
1806
1807                 if ( !hbin_prs_lf_records( "lf_rec", parent->subkeys.hbin, 0, parent ) )
1808                         return False;
1809         }
1810
1811         /* write the security descriptor */
1812
1813         nk->sk_off = REGF_OFFSET_NONE;
1814         if ( sec_desc ) {
1815                 uint32 sk_size = sk_record_data_size( sec_desc );
1816                 REGF_HBIN *sk_hbin;
1817
1818                 /* search for it in the existing list of sd's */
1819
1820                 if ( (nk->sec_desc = find_sk_record_by_sec_desc( file, sec_desc )) == NULL ) {
1821                         /* not found so add it to the list */
1822
1823                         if (!(sk_hbin = find_free_space( file, sk_size ))) {
1824                                 return NULL;
1825                         }
1826
1827                         if ( !(nk->sec_desc = TALLOC_ZERO_P( file->mem_ctx, REGF_SK_REC )) )
1828                                 return NULL;
1829
1830                         /* now we have to store the security descriptor in the list and
1831                            update the offsets */
1832
1833                         memcpy( nk->sec_desc->header, "sk", REC_HDR_SIZE );
1834                         nk->sec_desc->hbin      = sk_hbin;
1835                         nk->sec_desc->hbin_off  = prs_offset( &sk_hbin->ps );
1836                         nk->sec_desc->sk_off    = prs_offset( &sk_hbin->ps ) + sk_hbin->first_hbin_off - HBIN_HDR_SIZE;
1837                         nk->sec_desc->rec_size  = (sk_size-1)  ^ 0xFFFFFFFF;
1838
1839                         nk->sec_desc->sec_desc  = sec_desc;
1840                         nk->sec_desc->ref_count = 0;
1841
1842                         /* size value must be self-inclusive */
1843                         nk->sec_desc->size      = ndr_size_security_descriptor(sec_desc, 0)
1844                                 + sizeof(uint32);
1845
1846                         DLIST_ADD_END( file->sec_desc_list, nk->sec_desc, REGF_SK_REC *);
1847
1848                         /* update the offsets for us and the previous sd in the list.
1849                            if this is the first record, then just set the next and prev
1850                            offsets to ourself. */
1851
1852                         if ( DLIST_PREV(nk->sec_desc) ) {
1853                                 REGF_SK_REC *prev = DLIST_PREV(nk->sec_desc);
1854
1855                                 nk->sec_desc->prev_sk_off = prev->hbin_off + prev->hbin->first_hbin_off - HBIN_HDR_SIZE;
1856                                 prev->next_sk_off = nk->sec_desc->sk_off;
1857
1858                                 /* the end must loop around to the front */
1859                                 nk->sec_desc->next_sk_off = file->sec_desc_list->sk_off;
1860
1861                                 /* and first must loop around to the tail */
1862                                 file->sec_desc_list->prev_sk_off = nk->sec_desc->sk_off;
1863                         } else {
1864                                 nk->sec_desc->prev_sk_off = nk->sec_desc->sk_off;
1865                                 nk->sec_desc->next_sk_off = nk->sec_desc->sk_off;
1866                         }
1867                 }
1868
1869                 /* bump the reference count +1 */
1870
1871                 nk->sk_off = nk->sec_desc->sk_off;
1872                 nk->sec_desc->ref_count++;
1873         }
1874
1875         /* write the subkeys */
1876
1877         nk->subkeys_off = REGF_OFFSET_NONE;
1878         if ( (nk->num_subkeys = regsubkey_ctr_numkeys( subkeys )) != 0 ) {
1879                 uint32 lf_size = lf_record_data_size( nk->num_subkeys );
1880                 uint32 namelen;
1881                 int i;
1882
1883                 if (!(nk->subkeys.hbin = find_free_space( file, lf_size ))) {
1884                         return NULL;
1885                 }
1886                 nk->subkeys.hbin_off = prs_offset( &nk->subkeys.hbin->ps );
1887                 nk->subkeys.rec_size = (lf_size-1) ^ 0xFFFFFFFF;
1888                 nk->subkeys_off = prs_offset( &nk->subkeys.hbin->ps ) + nk->subkeys.hbin->first_hbin_off - HBIN_HDR_SIZE;
1889
1890                 memcpy( nk->subkeys.header, "lf", REC_HDR_SIZE );
1891
1892                 nk->subkeys.num_keys = nk->num_subkeys;
1893                 if (nk->subkeys.num_keys) {
1894                         if ( !(nk->subkeys.hashes = TALLOC_ZERO_ARRAY( file->mem_ctx, REGF_HASH_REC, nk->subkeys.num_keys )) )
1895                                 return NULL;
1896                 } else {
1897                         nk->subkeys.hashes = NULL;
1898                 }
1899                 nk->subkey_index = 0;
1900
1901                 /* update the max_bytes_subkey{name,classname} fields */
1902                 for ( i=0; i<nk->num_subkeys; i++ ) {
1903                         namelen = strlen( regsubkey_ctr_specific_key(subkeys, i) );
1904                         if ( namelen*2 > nk->max_bytes_subkeyname )
1905                                 nk->max_bytes_subkeyname = namelen * 2;
1906                 }
1907         }
1908
1909         /* write the values */
1910
1911         nk->values_off = REGF_OFFSET_NONE;
1912         if ( (nk->num_values = regval_ctr_numvals( values )) != 0 ) {
1913                 uint32 vlist_size = ( ( nk->num_values * sizeof(uint32) ) & 0xfffffff8 ) + 8;
1914                 int i;
1915
1916                 if (!(vlist_hbin = find_free_space( file, vlist_size ))) {
1917                         return NULL;
1918                 }
1919                 nk->values_off = prs_offset( &vlist_hbin->ps ) + vlist_hbin->first_hbin_off - HBIN_HDR_SIZE;
1920
1921                 if (nk->num_values) {
1922                         if ( !(nk->values = TALLOC_ARRAY( file->mem_ctx, REGF_VK_REC, nk->num_values )) )
1923                                 return NULL;
1924                 } else {
1925                         nk->values = NULL;
1926                 }
1927
1928                 /* create the vk records */
1929
1930                 for ( i=0; i<nk->num_values; i++ ) {
1931                         uint32 vk_size, namelen, datalen;
1932                         struct regval_blob *r;
1933
1934                         r = regval_ctr_specific_value( values, i );
1935                         create_vk_record( file, &nk->values[i], r );
1936                         vk_size = vk_record_data_size( &nk->values[i] );
1937                         nk->values[i].hbin = find_free_space( file, vk_size );
1938                         nk->values[i].hbin_off = prs_offset( &nk->values[i].hbin->ps );
1939                         nk->values[i].rec_size = ( vk_size - 1 ) ^ 0xFFFFFFFF;
1940                         nk->values[i].rec_off = prs_offset( &nk->values[i].hbin->ps )
1941                                 + nk->values[i].hbin->first_hbin_off
1942                                 - HBIN_HDR_SIZE;
1943
1944                         /* update the max bytes fields if necessary */
1945
1946                         namelen = strlen( regval_name(r) );
1947                         if ( namelen*2 > nk->max_bytes_valuename )
1948                                 nk->max_bytes_valuename = namelen * 2;
1949
1950                         datalen = regval_size( r );
1951                         if ( datalen > nk->max_bytes_value )
1952                                 nk->max_bytes_value = datalen;
1953                 }
1954         }
1955
1956         /* stream the records */
1957
1958         prs_set_offset( &nk->hbin->ps, nk->hbin_off );
1959         if ( !prs_nk_rec( "nk_rec", &nk->hbin->ps, 0, nk ) )
1960                 return False;
1961
1962         if ( nk->num_values ) {
1963                 if ( !hbin_prs_vk_records( "vk_records", vlist_hbin, 0, nk, file ) )
1964                         return False;
1965         }
1966
1967
1968         regfio_flush( file );
1969
1970         return nk;
1971 }
1972