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