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vfs_default: remove assert from vfswrap_mkdirat()
[Samba.git] / source3 / registry / regfio.c
blob930ac834d1a2921bab673c6ade1904560a048068
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 "system/filesys.h"
22 #include "regfio.h"
23 #include "../librpc/gen_ndr/ndr_security.h"
24 #include "../libcli/security/security_descriptor.h"
25 #include "../libcli/security/secdesc.h"
26
27 #undef DBGC_CLASS
28 #define DBGC_CLASS DBGC_REGISTRY
29
30 /*******************************************************************
31 *
32 * TODO : Right now this code basically ignores classnames.
33 *
34 ******************************************************************/
35
36 #if defined(PARANOID_MALLOC_CHECKER)
37 #define PRS_ALLOC_MEM(ps, type, count) (type *)prs_alloc_mem_((ps),sizeof(type),(count))
38 #else
39 #define PRS_ALLOC_MEM(ps, type, count) (type *)prs_alloc_mem((ps),sizeof(type),(count))
40 #endif
41
42 /*******************************************************************
43 Reads or writes an NTTIME structure.
44 ********************************************************************/
45
46 static bool smb_io_time(const char *desc, NTTIME *nttime, prs_struct *ps, int depth)
47 {
48 uint32_t low, high;
49 if (nttime == NULL)
50 return False;
51
52 prs_debug(ps, depth, desc, "smb_io_time");
53 depth++;
54
55 if(!prs_align(ps))
56 return False;
57
58 if (MARSHALLING(ps)) {
59 low = *nttime & 0xFFFFFFFF;
60 high = *nttime >> 32;
61 }
62
63 if(!prs_uint32("low ", ps, depth, &low)) /* low part */
64 return False;
65 if(!prs_uint32("high", ps, depth, &high)) /* high part */
66 return False;
67
68 if (UNMARSHALLING(ps)) {
69 *nttime = (((uint64_t)high << 32) + low);
70 }
71
72 return True;
73 }
74
75 /*******************************************************************
76 *******************************************************************/
77
78 static int write_block( REGF_FILE *file, prs_struct *ps, uint32_t offset )
79 {
80 int bytes_written, returned;
81 char *buffer = prs_data_p( ps );
82 uint32_t buffer_size = prs_data_size( ps );
83 SMB_STRUCT_STAT sbuf;
84
85 if ( file->fd == -1 )
86 return -1;
87
88 /* check for end of file */
89
90 if (sys_fstat(file->fd, &sbuf, false)) {
91 DEBUG(0,("write_block: stat() failed! (%s)\n", strerror(errno)));
92 return -1;
93 }
94
95 if ( lseek( file->fd, offset, SEEK_SET ) == -1 ) {
96 DEBUG(0,("write_block: lseek() failed! (%s)\n", strerror(errno) ));
97 return -1;
98 }
99
100 bytes_written = returned = 0;
101 while ( bytes_written < buffer_size ) {
102 if ( (returned = write( file->fd, buffer+bytes_written, buffer_size-bytes_written )) == -1 ) {
103 DEBUG(0,("write_block: write() failed! (%s)\n", strerror(errno) ));
104 return False;
105 }
106
107 bytes_written += returned;
108 }
109
110 return bytes_written;
111 }
112
113 /*******************************************************************
114 *******************************************************************/
115
116 static int read_block( REGF_FILE *file, prs_struct *ps, uint32_t file_offset, uint32_t block_size )
117 {
118 int bytes_read, returned;
119 char *buffer;
120 SMB_STRUCT_STAT sbuf;
121
122 /* check for end of file */
123
124 if (sys_fstat(file->fd, &sbuf, false)) {
125 DEBUG(0,("read_block: stat() failed! (%s)\n", strerror(errno)));
126 return -1;
127 }
128
129 if ( (size_t)file_offset >= sbuf.st_ex_size )
130 return -1;
131
132 /* if block_size == 0, we are parsing HBIN records and need
133 to read some of the header to get the block_size from there */
134
135 if ( block_size == 0 ) {
136 char hdr[0x20];
137
138 if ( lseek( file->fd, file_offset, SEEK_SET ) == -1 ) {
139 DEBUG(0,("read_block: lseek() failed! (%s)\n", strerror(errno) ));
140 return -1;
141 }
142
143 returned = read( file->fd, hdr, 0x20 );
144 if ( (returned == -1) || (returned < 0x20) ) {
145 DEBUG(0,("read_block: failed to read in HBIN header. Is the file corrupt?\n"));
146 return -1;
147 }
148
149 /* make sure this is an hbin header */
150
151 if ( strncmp( hdr, "hbin", HBIN_HDR_SIZE ) != 0 ) {
152 DEBUG(0,("read_block: invalid block header!\n"));
153 return -1;
154 }
155
156 block_size = IVAL( hdr, 0x08 );
157 }
158
159 DEBUG(10,("read_block: block_size == 0x%x\n", block_size ));
160
161 /* set the offset, initialize the buffer, and read the block from disk */
162
163 if ( lseek( file->fd, file_offset, SEEK_SET ) == -1 ) {
164 DEBUG(0,("read_block: lseek() failed! (%s)\n", strerror(errno) ));
165 return -1;
166 }
167
168 if (!prs_init( ps, block_size, file->mem_ctx, UNMARSHALL )) {
169 DEBUG(0,("read_block: prs_init() failed! (%s)\n", strerror(errno) ));
170 return -1;
171 }
172 buffer = prs_data_p( ps );
173 bytes_read = returned = 0;
174
175 while ( bytes_read < block_size ) {
176 if ( (returned = read( file->fd, buffer+bytes_read, block_size-bytes_read )) == -1 ) {
177 DEBUG(0,("read_block: read() failed (%s)\n", strerror(errno) ));
178 return False;
179 }
180 if ( (returned == 0) && (bytes_read < block_size) ) {
181 DEBUG(0,("read_block: not a valid registry file ?\n" ));
182 return False;
183 }
184
185 bytes_read += returned;
186 }
187
188 return bytes_read;
189 }
190
191 /*******************************************************************
192 *******************************************************************/
193
194 static bool write_hbin_block( REGF_FILE *file, REGF_HBIN *hbin )
195 {
196 if ( !hbin->dirty )
197 return True;
198
199 /* write free space record if any is available */
200
201 if ( hbin->free_off != REGF_OFFSET_NONE ) {
202 uint32_t header = 0xffffffff;
203
204 if ( !prs_set_offset( &hbin->ps, hbin->free_off-sizeof(uint32_t) ) )
205 return False;
206 if ( !prs_uint32( "free_size", &hbin->ps, 0, &hbin->free_size ) )
207 return False;
208 if ( !prs_uint32( "free_header", &hbin->ps, 0, &header ) )
209 return False;
210 }
211
212 hbin->dirty = (write_block( file, &hbin->ps, hbin->file_off ) != -1);
213
214 return hbin->dirty;
215 }
216
217 /*******************************************************************
218 *******************************************************************/
219
220 static bool hbin_block_close( REGF_FILE *file, REGF_HBIN *hbin )
221 {
222 REGF_HBIN *p;
223
224 /* remove the block from the open list and flush it to disk */
225
226 for ( p=file->block_list; p && p!=hbin; p=p->next )
227 ;
228
229 if ( p == hbin ) {
230 DLIST_REMOVE( file->block_list, hbin );
231 }
232 else
233 DEBUG(0,("hbin_block_close: block not in open list!\n"));
234
235 if ( !write_hbin_block( file, hbin ) )
236 return False;
237
238 return True;
239 }
240
241 /*******************************************************************
242 *******************************************************************/
243
244 static bool prs_regf_block( const char *desc, prs_struct *ps, int depth, REGF_FILE *file )
245 {
246 prs_debug(ps, depth, desc, "prs_regf_block");
247 depth++;
248
249 if ( !prs_uint8s( True, "header", ps, depth, (uint8_t *)file->header, sizeof( file->header )) )
250 return False;
251
252 /* yes, these values are always identical so store them only once */
253
254 if ( !prs_uint32( "unknown1", ps, depth, &file->unknown1 ))
255 return False;
256 if ( !prs_uint32( "unknown1 (again)", ps, depth, &file->unknown1 ))
257 return False;
258
259 /* get the modtime */
260
261 if ( !prs_set_offset( ps, 0x0c ) )
262 return False;
263 if ( !smb_io_time( "modtime", &file->mtime, ps, depth ) )
264 return False;
265
266 /* constants */
267
268 if ( !prs_uint32( "unknown2", ps, depth, &file->unknown2 ))
269 return False;
270 if ( !prs_uint32( "unknown3", ps, depth, &file->unknown3 ))
271 return False;
272 if ( !prs_uint32( "unknown4", ps, depth, &file->unknown4 ))
273 return False;
274 if ( !prs_uint32( "unknown5", ps, depth, &file->unknown5 ))
275 return False;
276
277 /* get file offsets */
278
279 if ( !prs_set_offset( ps, 0x24 ) )
280 return False;
281 if ( !prs_uint32( "data_offset", ps, depth, &file->data_offset ))
282 return False;
283 if ( !prs_uint32( "last_block", ps, depth, &file->last_block ))
284 return False;
285
286 /* one more constant */
287
288 if ( !prs_uint32( "unknown6", ps, depth, &file->unknown6 ))
289 return False;
290
291 /* get the checksum */
292
293 if ( !prs_set_offset( ps, 0x01fc ) )
294 return False;
295 if ( !prs_uint32( "checksum", ps, depth, &file->checksum ))
296 return False;
297
298 return True;
299 }
300
301 /*******************************************************************
302 *******************************************************************/
303
304 static bool prs_hbin_block( const char *desc, prs_struct *ps, int depth, REGF_HBIN *hbin )
305 {
306 uint32_t block_size2;
307
308 prs_debug(ps, depth, desc, "prs_hbin_block");
309 depth++;
310
311 if ( !prs_uint8s( True, "header", ps, depth, (uint8_t*)hbin->header, sizeof( hbin->header )) )
312 return False;
313
314 if ( !prs_uint32( "first_hbin_off", ps, depth, &hbin->first_hbin_off ))
315 return False;
316
317 /* The dosreg.cpp comments say that the block size is at 0x1c.
318 According to a WINXP NTUSER.dat file, this is wrong. The block_size
319 is at 0x08 */
320
321 if ( !prs_uint32( "block_size", ps, depth, &hbin->block_size ))
322 return False;
323
324 block_size2 = hbin->block_size;
325 prs_set_offset( ps, 0x1c );
326 if ( !prs_uint32( "block_size2", ps, depth, &block_size2 ))
327 return False;
328
329 if ( MARSHALLING(ps) )
330 hbin->dirty = True;
331
332
333 return True;
334 }
335
336 /*******************************************************************
337 *******************************************************************/
338
339 static bool prs_nk_rec( const char *desc, prs_struct *ps, int depth, REGF_NK_REC *nk )
340 {
341 uint16_t class_length, name_length;
342 uint32_t start;
343 uint32_t data_size, start_off, end_off;
344 uint32_t unknown_off = REGF_OFFSET_NONE;
345
346 nk->hbin_off = prs_offset( ps );
347 start = nk->hbin_off;
348
349 prs_debug(ps, depth, desc, "prs_nk_rec");
350 depth++;
351
352 /* back up and get the data_size */
353
354 if ( !prs_set_offset( ps, prs_offset(ps)-sizeof(uint32_t)) )
355 return False;
356 start_off = prs_offset( ps );
357 if ( !prs_uint32( "rec_size", ps, depth, &nk->rec_size ))
358 return False;
359
360 if ( !prs_uint8s( True, "header", ps, depth, (uint8_t *)nk->header, sizeof( nk->header )) )
361 return False;
362
363 if ( !prs_uint16( "key_type", ps, depth, &nk->key_type ))
364 return False;
365 if ( !smb_io_time( "mtime", &nk->mtime, ps, depth ))
366 return False;
367
368 if ( !prs_set_offset( ps, start+0x0010 ) )
369 return False;
370 if ( !prs_uint32( "parent_off", ps, depth, &nk->parent_off ))
371 return False;
372 if ( !prs_uint32( "num_subkeys", ps, depth, &nk->num_subkeys ))
373 return False;
374
375 if ( !prs_set_offset( ps, start+0x001c ) )
376 return False;
377 if ( !prs_uint32( "subkeys_off", ps, depth, &nk->subkeys_off ))
378 return False;
379 if ( !prs_uint32( "unknown_off", ps, depth, &unknown_off) )
380 return False;
381
382 if ( !prs_set_offset( ps, start+0x0024 ) )
383 return False;
384 if ( !prs_uint32( "num_values", ps, depth, &nk->num_values ))
385 return False;
386 if ( !prs_uint32( "values_off", ps, depth, &nk->values_off ))
387 return False;
388 if ( !prs_uint32( "sk_off", ps, depth, &nk->sk_off ))
389 return False;
390 if ( !prs_uint32( "classname_off", ps, depth, &nk->classname_off ))
391 return False;
392
393 if ( !prs_uint32( "max_bytes_subkeyname", ps, depth, &nk->max_bytes_subkeyname))
394 return False;
395 if ( !prs_uint32( "max_bytes_subkeyclassname", ps, depth, &nk->max_bytes_subkeyclassname))
396 return False;
397 if ( !prs_uint32( "max_bytes_valuename", ps, depth, &nk->max_bytes_valuename))
398 return False;
399 if ( !prs_uint32( "max_bytes_value", ps, depth, &nk->max_bytes_value))
400 return False;
401 if ( !prs_uint32( "unknown index", ps, depth, &nk->unk_index))
402 return False;
403
404 name_length = nk->keyname ? strlen(nk->keyname) : 0 ;
405 class_length = nk->classname ? strlen(nk->classname) : 0 ;
406 if ( !prs_uint16( "name_length", ps, depth, &name_length ))
407 return False;
408 if ( !prs_uint16( "class_length", ps, depth, &class_length ))
409 return False;
410
411 if ( class_length ) {
412 ;;
413 }
414
415 if ( name_length ) {
416 if ( UNMARSHALLING(ps) ) {
417 if ( !(nk->keyname = PRS_ALLOC_MEM( ps, char, name_length+1 )) )
418 return False;
419 }
420
421 if ( !prs_uint8s( True, "name", ps, depth, (uint8_t *)nk->keyname, name_length) )
422 return False;
423
424 if ( UNMARSHALLING(ps) )
425 nk->keyname[name_length] = '\0';
426 }
427
428 end_off = prs_offset( ps );
429
430 /* data_size must be divisible by 8 and large enough to hold the original record */
431
432 data_size = ((start_off - end_off) & 0xfffffff8 );
433 if ( data_size > nk->rec_size )
434 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, nk->rec_size));
435
436 if ( MARSHALLING(ps) )
437 nk->hbin->dirty = True;
438
439 return True;
440 }
441
442 /*******************************************************************
443 *******************************************************************/
444
445 static uint32_t regf_block_checksum( prs_struct *ps )
446 {
447 char *buffer = prs_data_p( ps );
448 uint32_t checksum, x;
449 int i;
450
451 /* XOR of all bytes 0x0000 - 0x01FB */
452
453 checksum = x = 0;
454
455 for ( i=0; i<0x01FB; i+=4 ) {
456 x = IVAL(buffer, i );
457 checksum ^= x;
458 }
459
460 return checksum;
461 }
462
463 /*******************************************************************
464 *******************************************************************/
465
466 static bool read_regf_block( REGF_FILE *file )
467 {
468 prs_struct ps;
469 uint32_t checksum;
470
471 /* grab the first block from the file */
472
473 if ( read_block( file, &ps, 0, REGF_BLOCKSIZE ) == -1 )
474 return False;
475
476 /* parse the block and verify the checksum */
477
478 if ( !prs_regf_block( "regf_header", &ps, 0, file ) )
479 return False;
480
481 checksum = regf_block_checksum( &ps );
482
483 prs_mem_free( &ps );
484
485 if ( file->checksum != checksum && !file->ignore_checksums) {
486 DEBUG(0,("read_regf_block: invalid checksum\n" ));
487 return False;
488 }
489
490 return True;
491 }
492
493 /*******************************************************************
494 *******************************************************************/
495
496 static REGF_HBIN* read_hbin_block( REGF_FILE *file, off_t offset )
497 {
498 REGF_HBIN *hbin;
499 uint32_t record_size, curr_off, block_size, header;
500
501 if ( !(hbin = talloc_zero(file->mem_ctx, REGF_HBIN)) )
502 return NULL;
503 hbin->file_off = offset;
504 hbin->free_off = -1;
505
506 if ( read_block( file, &hbin->ps, offset, 0 ) == -1 )
507 return NULL;
508
509 if ( !prs_hbin_block( "hbin", &hbin->ps, 0, hbin ) )
510 return NULL;
511
512 /* this should be the same thing as hbin->block_size but just in case */
513
514 block_size = prs_data_size( &hbin->ps );
515
516 /* Find the available free space offset. Always at the end,
517 so walk the record list and stop when you get to the end.
518 The end is defined by a record header of 0xffffffff. The
519 previous 4 bytes contains the amount of free space remaining
520 in the hbin block. */
521
522 /* remember that the record_size is in the 4 bytes preceding the record itself */
523
524 if ( !prs_set_offset( &hbin->ps, file->data_offset+HBIN_HDR_SIZE-sizeof(uint32_t) ) )
525 return NULL;
526
527 record_size = 0;
528 header = 0;
529 curr_off = prs_offset( &hbin->ps );
530 while ( header != 0xffffffff ) {
531 /* not done yet so reset the current offset to the
532 next record_size field */
533
534 curr_off = curr_off+record_size;
535
536 /* for some reason the record_size of the last record in
537 an hbin block can extend past the end of the block
538 even though the record fits within the remaining
539 space....aaarrrgggghhhhhh */
540
541 if ( curr_off >= block_size ) {
542 record_size = -1;
543 curr_off = -1;
544 break;
545 }
546
547 if ( !prs_set_offset( &hbin->ps, curr_off) )
548 return NULL;
549
550 if ( !prs_uint32( "rec_size", &hbin->ps, 0, &record_size ) )
551 return NULL;
552 if ( !prs_uint32( "header", &hbin->ps, 0, &header ) )
553 return NULL;
554
555 if (record_size == 0)
556 return NULL;
557
558 if ( record_size & 0x80000000 ) {
559 /* absolute_value(record_size) */
560 record_size = (record_size ^ 0xffffffff) + 1;
561 }
562 }
563
564 /* save the free space offset */
565
566 if ( header == 0xffffffff ) {
567
568 /* account for the fact that the curr_off is 4 bytes behind the actual
569 record header */
570
571 hbin->free_off = curr_off + sizeof(uint32_t);
572 hbin->free_size = record_size;
573 }
574
575 DEBUG(10,("read_hbin_block: free space offset == 0x%x\n", hbin->free_off));
576
577 if ( !prs_set_offset( &hbin->ps, file->data_offset+HBIN_HDR_SIZE ) )
578 return NULL;
579
580 return hbin;
581 }
582
583 /*******************************************************************
584 Input a random offset and receive the corresponding HBIN
585 block for it
586 *******************************************************************/
587
588 static bool hbin_contains_offset( REGF_HBIN *hbin, uint32_t offset )
589 {
590 if ( !hbin )
591 return False;
592
593 if ( (offset > hbin->first_hbin_off) && (offset < (hbin->first_hbin_off+hbin->block_size)) )
594 return True;
595
596 return False;
597 }
598
599 /*******************************************************************
600 Input a random offset and receive the corresponding HBIN
601 block for it
602 *******************************************************************/
603
604 static REGF_HBIN* lookup_hbin_block( REGF_FILE *file, uint32_t offset )
605 {
606 REGF_HBIN *hbin = NULL;
607 uint32_t block_off;
608
609 /* start with the open list */
610
611 for ( hbin=file->block_list; hbin; hbin=hbin->next ) {
612 DEBUG(10,("lookup_hbin_block: address = 0x%x [0x%lx]\n", hbin->file_off, (unsigned long)hbin ));
613 if ( hbin_contains_offset( hbin, offset ) )
614 return hbin;
615 }
616
617 if ( !hbin ) {
618 /* start at the beginning */
619
620 block_off = REGF_BLOCKSIZE;
621 do {
622 /* cleanup before the next round */
623 if ( hbin )
624 prs_mem_free( &hbin->ps );
625
626 hbin = read_hbin_block( file, block_off );
627
628 if ( hbin )
629 block_off = hbin->file_off + hbin->block_size;
630
631 } while ( hbin && !hbin_contains_offset( hbin, offset ) );
632 }
633
634 if ( hbin )
635 DLIST_ADD( file->block_list, hbin );
636
637 return hbin;
638 }
639
640 /*******************************************************************
641 *******************************************************************/
642
643 static bool prs_hash_rec( const char *desc, prs_struct *ps, int depth, REGF_HASH_REC *hash )
644 {
645 prs_debug(ps, depth, desc, "prs_hash_rec");
646 depth++;
647
648 if ( !prs_uint32( "nk_off", ps, depth, &hash->nk_off ))
649 return False;
650 if ( !prs_uint8s( True, "keycheck", ps, depth, hash->keycheck, sizeof( hash->keycheck )) )
651 return False;
652
653 return True;
654 }
655
656 /*******************************************************************
657 *******************************************************************/
658
659 static bool hbin_prs_lf_records( const char *desc, REGF_HBIN *hbin, int depth, REGF_NK_REC *nk )
660 {
661 int i;
662 REGF_LF_REC *lf = &nk->subkeys;
663 uint32_t data_size, start_off, end_off;
664
665 prs_debug(&hbin->ps, depth, desc, "prs_lf_records");
666 depth++;
667
668 /* check if we have anything to do first */
669
670 if ( nk->num_subkeys == 0 )
671 return True;
672
673 /* move to the LF record */
674
675 if ( !prs_set_offset( &hbin->ps, nk->subkeys_off + HBIN_HDR_SIZE - hbin->first_hbin_off ) )
676 return False;
677
678 /* backup and get the data_size */
679
680 if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32_t)) )
681 return False;
682 start_off = prs_offset( &hbin->ps );
683 if ( !prs_uint32( "rec_size", &hbin->ps, depth, &lf->rec_size ))
684 return False;
685
686 if ( !prs_uint8s( True, "header", &hbin->ps, depth, (uint8_t *)lf->header, sizeof( lf->header )) )
687 return False;
688
689 if ( !prs_uint16( "num_keys", &hbin->ps, depth, &lf->num_keys))
690 return False;
691
692 if ( UNMARSHALLING(&hbin->ps) ) {
693 if (lf->num_keys) {
694 if ( !(lf->hashes = PRS_ALLOC_MEM( &hbin->ps, REGF_HASH_REC, lf->num_keys )) )
695 return False;
696 } else {
697 lf->hashes = NULL;
698 }
699 }
700
701 for ( i=0; i<lf->num_keys; i++ ) {
702 if ( !prs_hash_rec( "hash_rec", &hbin->ps, depth, &lf->hashes[i] ) )
703 return False;
704 }
705
706 end_off = prs_offset( &hbin->ps );
707
708 /* data_size must be divisible by 8 and large enough to hold the original record */
709
710 data_size = ((start_off - end_off) & 0xfffffff8 );
711 if ( data_size > lf->rec_size )
712 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, lf->rec_size));
713
714 if ( MARSHALLING(&hbin->ps) )
715 hbin->dirty = True;
716
717 return True;
718 }
719
720 /*******************************************************************
721 *******************************************************************/
722
723 static bool hbin_prs_sk_rec( const char *desc, REGF_HBIN *hbin, int depth, REGF_SK_REC *sk )
724 {
725 prs_struct *ps = &hbin->ps;
726 uint16_t tag = 0xFFFF;
727 uint32_t data_size, start_off, end_off;
728
729
730 prs_debug(ps, depth, desc, "hbin_prs_sk_rec");
731 depth++;
732
733 if ( !prs_set_offset( &hbin->ps, sk->sk_off + HBIN_HDR_SIZE - hbin->first_hbin_off ) )
734 return False;
735
736 /* backup and get the data_size */
737
738 if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32_t)) )
739 return False;
740 start_off = prs_offset( &hbin->ps );
741 if ( !prs_uint32( "rec_size", &hbin->ps, depth, &sk->rec_size ))
742 return False;
743
744 if ( !prs_uint8s( True, "header", ps, depth, (uint8_t *)sk->header, sizeof( sk->header )) )
745 return False;
746 if ( !prs_uint16( "tag", ps, depth, &tag))
747 return False;
748
749 if ( !prs_uint32( "prev_sk_off", ps, depth, &sk->prev_sk_off))
750 return False;
751 if ( !prs_uint32( "next_sk_off", ps, depth, &sk->next_sk_off))
752 return False;
753 if ( !prs_uint32( "ref_count", ps, depth, &sk->ref_count))
754 return False;
755 if ( !prs_uint32( "size", ps, depth, &sk->size))
756 return False;
757
758 {
759 NTSTATUS status;
760 TALLOC_CTX *mem_ctx = prs_get_mem_context(&hbin->ps);
761 DATA_BLOB blob;
762
763 if (MARSHALLING(&hbin->ps)) {
764 status = marshall_sec_desc(mem_ctx,
765 sk->sec_desc,
766 &blob.data, &blob.length);
767 if (!NT_STATUS_IS_OK(status))
768 return False;
769 if (!prs_copy_data_in(&hbin->ps, (const char *)blob.data, blob.length))
770 return False;
771 } else {
772 blob = data_blob_const(
773 prs_data_p(&hbin->ps) + prs_offset(&hbin->ps),
774 prs_data_size(&hbin->ps) - prs_offset(&hbin->ps)
775 );
776 status = unmarshall_sec_desc(mem_ctx,
777 blob.data, blob.length,
778 &sk->sec_desc);
779 if (!NT_STATUS_IS_OK(status))
780 return False;
781 prs_set_offset(&hbin->ps, blob.length);
782 }
783 }
784
785 end_off = prs_offset( &hbin->ps );
786
787 /* data_size must be divisible by 8 and large enough to hold the original record */
788
789 data_size = ((start_off - end_off) & 0xfffffff8 );
790 if ( data_size > sk->rec_size )
791 DEBUG(10,("Encountered reused record (0x%x < 0x%x)\n", data_size, sk->rec_size));
792
793 if ( MARSHALLING(&hbin->ps) )
794 hbin->dirty = True;
795
796 return True;
797 }
798
799 /*******************************************************************
800 *******************************************************************/
801
802 static bool hbin_prs_vk_rec( const char *desc, REGF_HBIN *hbin, int depth, REGF_VK_REC *vk, REGF_FILE *file )
803 {
804 uint32_t offset;
805 uint16_t name_length;
806 prs_struct *ps = &hbin->ps;
807 uint32_t data_size, start_off, end_off;
808
809 prs_debug(ps, depth, desc, "prs_vk_rec");
810 depth++;
811
812 /* backup and get the data_size */
813
814 if ( !prs_set_offset( &hbin->ps, prs_offset(&hbin->ps)-sizeof(uint32_t)) )
815 return False;
816 start_off = prs_offset( &hbin->ps );
817 if ( !prs_uint32( "rec_size", &hbin->ps, depth, &vk->rec_size ))
818 return False;
819
820 if ( !prs_uint8s( True, "header", ps, depth, (uint8_t *)vk->header, sizeof( vk->header )) )
821 return False;
822
823 if ( MARSHALLING(&hbin->ps) )
824 name_length = strlen(vk->valuename);
825
826 if ( !prs_uint16( "name_length", ps, depth, &name_length ))
827 return False;
828 if ( !prs_uint32( "data_size", ps, depth, &vk->data_size ))
829 return False;
830 if ( !prs_uint32( "data_off", ps, depth, &vk->data_off ))
831 return False;
832 if ( !prs_uint32( "type", ps, depth, &vk->type))
833 return False;
834 if ( !prs_uint16( "flag", ps, depth, &vk->flag))
835 return False;
836
837 offset = prs_offset( ps );
838 offset += 2; /* skip 2 bytes */
839 prs_set_offset( ps, offset );
840
841 /* get the name */
842
843 if ( vk->flag&VK_FLAG_NAME_PRESENT ) {
844
845 if ( UNMARSHALLING(&hbin->ps) ) {
846 if ( !(vk->valuename = PRS_ALLOC_MEM( ps, char, name_length+1 )))
847 return False;
848 }
849 if ( !prs_uint8s( True, "name", ps, depth, (uint8_t *)vk->valuename, name_length ) )
850 return False;
851 }
852
853 end_off = prs_offset( &hbin->ps );
854
855 /* get the data if necessary */
856
857 if ( vk->data_size != 0 ) {
858 bool charmode = False;
859
860 if ( (vk->type == REG_SZ) || (vk->type == REG_MULTI_SZ) )
861 charmode = True;
862
863 /* the data is stored in the offset if the size <= 4 */
864
865 if ( !(vk->data_size & VK_DATA_IN_OFFSET) ) {
866 REGF_HBIN *hblock = hbin;
867 uint32_t data_rec_size;
868
869 if ( UNMARSHALLING(&hbin->ps) ) {
870 if ( !(vk->data = PRS_ALLOC_MEM( ps, uint8_t, vk->data_size) ) )
871 return False;
872 }
873
874 /* this data can be in another hbin */
875 if ( !hbin_contains_offset( hbin, vk->data_off ) ) {
876 if ( !(hblock = lookup_hbin_block( file, vk->data_off )) )
877 return False;
878 }
879 if ( !(prs_set_offset( &hblock->ps, (vk->data_off+HBIN_HDR_SIZE-hblock->first_hbin_off)-sizeof(uint32_t) )) )
880 return False;
881
882 if ( MARSHALLING(&hblock->ps) ) {
883 data_rec_size = ( (vk->data_size+sizeof(uint32_t)) & 0xfffffff8 ) + 8;
884 data_rec_size = ( data_rec_size - 1 ) ^ 0xFFFFFFFF;
885 }
886 if ( !prs_uint32( "data_rec_size", &hblock->ps, depth, &data_rec_size ))
887 return False;
888 if ( !prs_uint8s( charmode, "data", &hblock->ps, depth, vk->data, vk->data_size) )
889 return False;
890
891 if ( MARSHALLING(&hblock->ps) )
892 hblock->dirty = True;
893 }
894 else {
895 if ( !(vk->data = PRS_ALLOC_MEM( ps, uint8_t, 4 ) ) )
896 return False;
897 SIVAL( vk->data, 0, vk->data_off );
898 }
899
900 }
901
902 /* data_size must be divisible by 8 and large enough to hold the original record */
903
904 data_size = ((start_off - end_off ) & 0xfffffff8 );
905 if ( data_size != vk->rec_size )
906 DEBUG(10,("prs_vk_rec: data_size check failed (0x%x < 0x%x)\n", data_size, vk->rec_size));
907
908 if ( MARSHALLING(&hbin->ps) )
909 hbin->dirty = True;
910
911 return True;
912 }
913
914 /*******************************************************************
915 read a VK record which is contained in the HBIN block stored
916 in the prs_struct *ps.
917 *******************************************************************/
918
919 static bool hbin_prs_vk_records( const char *desc, REGF_HBIN *hbin, int depth, REGF_NK_REC *nk, REGF_FILE *file )
920 {
921 int i;
922 uint32_t record_size;
923
924 prs_debug(&hbin->ps, depth, desc, "prs_vk_records");
925 depth++;
926
927 /* check if we have anything to do first */
928
929 if ( nk->num_values == 0 )
930 return True;
931
932 if ( UNMARSHALLING(&hbin->ps) ) {
933 if ( !(nk->values = PRS_ALLOC_MEM( &hbin->ps, REGF_VK_REC, nk->num_values ) ) )
934 return False;
935 }
936
937 /* convert the offset to something relative to this HBIN block */
938
939 if ( !prs_set_offset( &hbin->ps, nk->values_off+HBIN_HDR_SIZE-hbin->first_hbin_off-sizeof(uint32_t)) )
940 return False;
941
942 if ( MARSHALLING( &hbin->ps) ) {
943 record_size = ( ( nk->num_values * sizeof(uint32_t) ) & 0xfffffff8 ) + 8;
944 record_size = (record_size - 1) ^ 0xFFFFFFFF;
945 }
946
947 if ( !prs_uint32( "record_size", &hbin->ps, depth, &record_size ) )
948 return False;
949
950 for ( i=0; i<nk->num_values; i++ ) {
951 if ( !prs_uint32( "vk_off", &hbin->ps, depth, &nk->values[i].rec_off ) )
952 return False;
953 }
954
955 for ( i=0; i<nk->num_values; i++ ) {
956 REGF_HBIN *sub_hbin = hbin;
957 uint32_t new_offset;
958
959 if ( !hbin_contains_offset( hbin, nk->values[i].rec_off ) ) {
960 sub_hbin = lookup_hbin_block( file, nk->values[i].rec_off );
961 if ( !sub_hbin ) {
962 DEBUG(0,("hbin_prs_vk_records: Failed to find HBIN block containing offset [0x%x]\n",
963 nk->values[i].hbin_off));
964 return False;
965 }
966 }
967
968 new_offset = nk->values[i].rec_off + HBIN_HDR_SIZE - sub_hbin->first_hbin_off;
969 if ( !prs_set_offset( &sub_hbin->ps, new_offset ) )
970 return False;
971 if ( !hbin_prs_vk_rec( "vk_rec", sub_hbin, depth, &nk->values[i], file ) )
972 return False;
973 }
974
975 if ( MARSHALLING(&hbin->ps) )
976 hbin->dirty = True;
977
978
979 return True;
980 }
981
982
983 /*******************************************************************
984 *******************************************************************/
985
986 static REGF_SK_REC* find_sk_record_by_offset( REGF_FILE *file, uint32_t offset )
987 {
988 REGF_SK_REC *p_sk;
989
990 for ( p_sk=file->sec_desc_list; p_sk; p_sk=p_sk->next ) {
991 if ( p_sk->sk_off == offset )
992 return p_sk;
993 }
994
995 return NULL;
996 }
997
998 /*******************************************************************
999 *******************************************************************/
1000
1001 static REGF_SK_REC* find_sk_record_by_sec_desc( REGF_FILE *file, struct security_descriptor *sd )
1002 {
1003 REGF_SK_REC *p;
1004
1005 for ( p=file->sec_desc_list; p; p=p->next ) {
1006 if ( security_descriptor_equal( p->sec_desc, sd ) )
1007 return p;
1008 }
1009
1010 /* failure */
1011
1012 return NULL;
1013 }
1014
1015 /*******************************************************************
1016 *******************************************************************/
1017
1018 static bool hbin_prs_key( REGF_FILE *file, REGF_HBIN *hbin, REGF_NK_REC *nk )
1019 {
1020 int depth = 0;
1021 REGF_HBIN *sub_hbin;
1022
1023 prs_debug(&hbin->ps, depth, "", "prs_key");
1024 depth++;
1025
1026 /* get the initial nk record */
1027
1028 if ( !prs_nk_rec( "nk_rec", &hbin->ps, depth, nk ))
1029 return False;
1030
1031 /* fill in values */
1032
1033 if ( nk->num_values && (nk->values_off!=REGF_OFFSET_NONE) ) {
1034 sub_hbin = hbin;
1035 if ( !hbin_contains_offset( hbin, nk->values_off ) ) {
1036 sub_hbin = lookup_hbin_block( file, nk->values_off );
1037 if ( !sub_hbin ) {
1038 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing value_list_offset [0x%x]\n",
1039 nk->values_off));
1040 return False;
1041 }
1042 }
1043
1044 if ( !hbin_prs_vk_records( "vk_rec", sub_hbin, depth, nk, file ))
1045 return False;
1046 }
1047
1048 /* now get subkeys */
1049
1050 if ( nk->num_subkeys && (nk->subkeys_off!=REGF_OFFSET_NONE) ) {
1051 sub_hbin = hbin;
1052 if ( !hbin_contains_offset( hbin, nk->subkeys_off ) ) {
1053 sub_hbin = lookup_hbin_block( file, nk->subkeys_off );
1054 if ( !sub_hbin ) {
1055 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing subkey_offset [0x%x]\n",
1056 nk->subkeys_off));
1057 return False;
1058 }
1059 }
1060
1061 if ( !hbin_prs_lf_records( "lf_rec", sub_hbin, depth, nk ))
1062 return False;
1063 }
1064
1065 /* get the to the security descriptor. First look if we have already parsed it */
1066
1067 if ( (nk->sk_off!=REGF_OFFSET_NONE) && !( nk->sec_desc = find_sk_record_by_offset( file, nk->sk_off )) ) {
1068
1069 sub_hbin = hbin;
1070 if ( !hbin_contains_offset( hbin, nk->sk_off ) ) {
1071 sub_hbin = lookup_hbin_block( file, nk->sk_off );
1072 if ( !sub_hbin ) {
1073 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing sk_off [0x%x]\n",
1074 nk->sk_off));
1075 return False;
1076 }
1077 }
1078
1079 if ( !(nk->sec_desc = talloc_zero( file->mem_ctx, REGF_SK_REC )) )
1080 return False;
1081 nk->sec_desc->sk_off = nk->sk_off;
1082 if ( !hbin_prs_sk_rec( "sk_rec", sub_hbin, depth, nk->sec_desc ))
1083 return False;
1084
1085 /* add to the list of security descriptors (ref_count has been read from the files) */
1086
1087 nk->sec_desc->sk_off = nk->sk_off;
1088 DLIST_ADD( file->sec_desc_list, nk->sec_desc );
1089 }
1090
1091 return True;
1092 }
1093
1094 /*******************************************************************
1095 *******************************************************************/
1096
1097 static bool next_record( REGF_HBIN *hbin, const char *hdr, bool *eob )
1098 {
1099 uint8_t header[REC_HDR_SIZE];
1100 uint32_t record_size;
1101 uint32_t curr_off, block_size;
1102 bool found = False;
1103 prs_struct *ps = &hbin->ps;
1104
1105 curr_off = prs_offset( ps );
1106 if ( curr_off == 0 )
1107 prs_set_offset( ps, HBIN_HEADER_REC_SIZE );
1108
1109 /* assume that the current offset is at the record header
1110 and we need to backup to read the record size */
1111
1112 curr_off -= sizeof(uint32_t);
1113
1114 block_size = prs_data_size( ps );
1115 record_size = 0;
1116 memset( header, 0x0, sizeof(uint8_t)*REC_HDR_SIZE );
1117 while ( !found ) {
1118
1119 curr_off = curr_off+record_size;
1120 if ( curr_off >= block_size )
1121 break;
1122
1123 if ( !prs_set_offset( &hbin->ps, curr_off) )
1124 return False;
1125
1126 if ( !prs_uint32( "record_size", ps, 0, &record_size ) )
1127 return False;
1128 if ( !prs_uint8s( True, "header", ps, 0, header, REC_HDR_SIZE ) )
1129 return False;
1130
1131 if (record_size & 0x80000000) {
1132 /* absolute_value(record_size) */
1133 record_size = (record_size ^ 0xffffffff) + 1;
1134 }
1135
1136 if (record_size < sizeof(REC_HDR_SIZE)) {
1137 return false;
1138 }
1139
1140 if (memcmp(header, hdr, REC_HDR_SIZE) == 0) {
1141 found = True;
1142 curr_off += sizeof(uint32_t);
1143 }
1144 }
1145
1146 /* mark prs_struct as done ( at end ) if no more SK records */
1147 /* mark end-of-block as True */
1148
1149 if ( !found ) {
1150 prs_set_offset( &hbin->ps, prs_data_size(&hbin->ps) );
1151 *eob = True;
1152 return False;
1153 }
1154
1155 if ( !prs_set_offset( ps, curr_off ) )
1156 return False;
1157
1158 return True;
1159 }
1160
1161 /*******************************************************************
1162 *******************************************************************/
1163
1164 static bool next_nk_record( REGF_FILE *file, REGF_HBIN *hbin, REGF_NK_REC *nk, bool *eob )
1165 {
1166 if ( next_record( hbin, "nk", eob ) && hbin_prs_key( file, hbin, nk ) )
1167 return True;
1168
1169 return False;
1170 }
1171
1172 /*******************************************************************
1173 Intialize the newly created REGF_BLOCK in *file and write the
1174 block header to disk
1175 *******************************************************************/
1176
1177 static bool init_regf_block( REGF_FILE *file )
1178 {
1179 prs_struct ps;
1180 bool result = True;
1181
1182 if ( !prs_init( &ps, REGF_BLOCKSIZE, file->mem_ctx, MARSHALL ) )
1183 return False;
1184
1185 memcpy( file->header, "regf", REGF_HDR_SIZE );
1186 file->data_offset = 0x20;
1187 file->last_block = 0x1000;
1188
1189 /* set mod time */
1190
1191 unix_to_nt_time( &file->mtime, time(NULL) );
1192
1193 /* hard coded values...no diea what these are ... maybe in time */
1194
1195 file->unknown1 = 0x2;
1196 file->unknown2 = 0x1;
1197 file->unknown3 = 0x3;
1198 file->unknown4 = 0x0;
1199 file->unknown5 = 0x1;
1200 file->unknown6 = 0x1;
1201
1202 /* write header to the buffer */
1203
1204 if ( !prs_regf_block( "regf_header", &ps, 0, file ) ) {
1205 result = False;
1206 goto out;
1207 }
1208
1209 /* calculate the checksum, re-marshall data (to include the checksum)
1210 and write to disk */
1211
1212 file->checksum = regf_block_checksum( &ps );
1213 prs_set_offset( &ps, 0 );
1214 if ( !prs_regf_block( "regf_header", &ps, 0, file ) ) {
1215 result = False;
1216 goto out;
1217 }
1218
1219 if ( write_block( file, &ps, 0 ) == -1 ) {
1220 DEBUG(0,("init_regf_block: Failed to initialize registry header block!\n"));
1221 result = False;
1222 goto out;
1223 }
1224
1225 out:
1226 prs_mem_free( &ps );
1227
1228 return result;
1229 }
1230 /*******************************************************************
1231 Open the registry file and then read in the REGF block to get the
1232 first hbin offset.
1233 *******************************************************************/
1234
1235 REGF_FILE* regfio_open( const char *filename, int flags, int mode )
1236 {
1237 REGF_FILE *rb;
1238
1239 if ( !(rb = SMB_MALLOC_P(REGF_FILE)) ) {
1240 DEBUG(0,("ERROR allocating memory\n"));
1241 return NULL;
1242 }
1243 ZERO_STRUCTP( rb );
1244 rb->fd = -1;
1245 rb->ignore_checksums = false;
1246
1247 if ( !(rb->mem_ctx = talloc_init( "regfio_open" )) ) {
1248 regfio_close( rb );
1249 return NULL;
1250 }
1251
1252 rb->open_flags = flags;
1253
1254 /* open and existing file */
1255
1256 if ( (rb->fd = open(filename, flags, mode)) == -1 ) {
1257 DEBUG(0,("regfio_open: failure to open %s (%s)\n", filename, strerror(errno)));
1258 regfio_close( rb );
1259 return NULL;
1260 }
1261
1262 /* check if we are creating a new file or overwriting an existing one */
1263
1264 if ( flags & (O_CREAT|O_TRUNC) ) {
1265 if ( !init_regf_block( rb ) ) {
1266 DEBUG(0,("regfio_open: Failed to read initial REGF block\n"));
1267 regfio_close( rb );
1268 return NULL;
1269 }
1270
1271 /* success */
1272 return rb;
1273 }
1274
1275 /* read in an existing file */
1276
1277 if ( !read_regf_block( rb ) ) {
1278 DEBUG(0,("regfio_open: Failed to read initial REGF block\n"));
1279 regfio_close( rb );
1280 return NULL;
1281 }
1282
1283 /* success */
1284
1285 return rb;
1286 }
1287
1288 /*******************************************************************
1289 *******************************************************************/
1290
1291 static void regfio_mem_free( REGF_FILE *file )
1292 {
1293 /* free any talloc()'d memory */
1294
1295 if ( file && file->mem_ctx )
1296 talloc_destroy( file->mem_ctx );
1297 }
1298
1299 /*******************************************************************
1300 *******************************************************************/
1301
1302 int regfio_close( REGF_FILE *file )
1303 {
1304 int fd;
1305
1306 /* cleanup for a file opened for write */
1307
1308 if ((file->fd != -1) && (file->open_flags & (O_WRONLY|O_RDWR))) {
1309 prs_struct ps;
1310 REGF_SK_REC *sk;
1311
1312 /* write of sd list */
1313
1314 for ( sk=file->sec_desc_list; sk; sk=sk->next ) {
1315 hbin_prs_sk_rec( "sk_rec", sk->hbin, 0, sk );
1316 }
1317
1318 /* flush any dirty blocks */
1319
1320 while ( file->block_list ) {
1321 hbin_block_close( file, file->block_list );
1322 }
1323
1324 ZERO_STRUCT( ps );
1325
1326 unix_to_nt_time( &file->mtime, time(NULL) );
1327
1328 if ( read_block( file, &ps, 0, REGF_BLOCKSIZE ) != -1 ) {
1329 /* now use for writing */
1330 prs_switch_type( &ps, MARSHALL );
1331
1332 /* stream the block once, generate the checksum,
1333 and stream it again */
1334 prs_set_offset( &ps, 0 );
1335 prs_regf_block( "regf_blocK", &ps, 0, file );
1336 file->checksum = regf_block_checksum( &ps );
1337 prs_set_offset( &ps, 0 );
1338 prs_regf_block( "regf_blocK", &ps, 0, file );
1339
1340 /* now we are ready to write it to disk */
1341 if ( write_block( file, &ps, 0 ) == -1 )
1342 DEBUG(0,("regfio_close: failed to update the regf header block!\n"));
1343 }
1344
1345 prs_mem_free( &ps );
1346 }
1347
1348 regfio_mem_free( file );
1349
1350 /* nothing tdo do if there is no open file */
1351
1352 if (file->fd == -1)
1353 return 0;
1354
1355 fd = file->fd;
1356 file->fd = -1;
1357 SAFE_FREE( file );
1358
1359 return close( fd );
1360 }
1361
1362 /*******************************************************************
1363 *******************************************************************/
1364
1365 static void regfio_flush( REGF_FILE *file )
1366 {
1367 REGF_HBIN *hbin;
1368
1369 for ( hbin=file->block_list; hbin; hbin=hbin->next ) {
1370 write_hbin_block( file, hbin );
1371 }
1372 }
1373
1374 /*******************************************************************
1375 There should be only *one* root key in the registry file based
1376 on my experience. --jerry
1377 *******************************************************************/
1378
1379 REGF_NK_REC* regfio_rootkey( REGF_FILE *file )
1380 {
1381 REGF_NK_REC *nk;
1382 REGF_HBIN *hbin;
1383 uint32_t offset = REGF_BLOCKSIZE;
1384 bool found = False;
1385 bool eob;
1386
1387 if ( !file )
1388 return NULL;
1389
1390 if ( !(nk = talloc_zero( file->mem_ctx, REGF_NK_REC )) ) {
1391 DEBUG(0,("regfio_rootkey: talloc() failed!\n"));
1392 return NULL;
1393 }
1394
1395 /* scan through the file on HBIN block at a time looking
1396 for an NK record with a type == 0x002c.
1397 Normally this is the first nk record in the first hbin
1398 block (but I'm not assuming that for now) */
1399
1400 while ( (hbin = read_hbin_block( file, offset )) ) {
1401 eob = False;
1402
1403 while ( !eob) {
1404 if ( next_nk_record( file, hbin, nk, &eob ) ) {
1405 if ( nk->key_type == NK_TYPE_ROOTKEY ) {
1406 found = True;
1407 break;
1408 }
1409 }
1410 prs_mem_free( &hbin->ps );
1411 }
1412
1413 if ( found )
1414 break;
1415
1416 offset += hbin->block_size;
1417 }
1418
1419 if ( !found ) {
1420 DEBUG(0,("regfio_rootkey: corrupt registry file ? No root key record located\n"));
1421 return NULL;
1422 }
1423
1424 DLIST_ADD( file->block_list, hbin );
1425
1426 return nk;
1427 }
1428
1429 /*******************************************************************
1430 This acts as an interator over the subkeys defined for a given
1431 NK record. Remember that offsets are from the *first* HBIN block.
1432 *******************************************************************/
1433
1434 REGF_NK_REC* regfio_fetch_subkey( REGF_FILE *file, REGF_NK_REC *nk )
1435 {
1436 REGF_NK_REC *subkey;
1437 REGF_HBIN *hbin;
1438 uint32_t nk_offset;
1439
1440 /* see if there is anything left to report */
1441
1442 if (nk == NULL ||
1443 nk->subkeys.hashes == NULL ||
1444 nk->subkey_index >= nk->subkeys.num_keys ||
1445 (nk->subkeys_off == REGF_OFFSET_NONE) ||
1446 (nk->subkey_index >= nk->num_subkeys)) {
1447 return NULL;
1448 }
1449
1450 /* find the HBIN block which should contain the nk record */
1451
1452 hbin = lookup_hbin_block(file,
1453 nk->subkeys.hashes[nk->subkey_index].nk_off);
1454 if (hbin == NULL) {
1455 DEBUG(0,("hbin_prs_key: Failed to find HBIN block containing offset [0x%x]\n",
1456 nk->subkeys.hashes[nk->subkey_index].nk_off));
1457 return NULL;
1458 }
1459
1460 nk_offset = nk->subkeys.hashes[nk->subkey_index].nk_off;
1461 if ( !prs_set_offset( &hbin->ps, (HBIN_HDR_SIZE + nk_offset - hbin->first_hbin_off) ) )
1462 return NULL;
1463
1464 nk->subkey_index++;
1465 if ( !(subkey = talloc_zero( file->mem_ctx, REGF_NK_REC )) )
1466 return NULL;
1467
1468 if ( !hbin_prs_key( file, hbin, subkey ) )
1469 return NULL;
1470
1471 return subkey;
1472 }
1473
1474
1475 /*******************************************************************
1476 *******************************************************************/
1477
1478 static REGF_HBIN* regf_hbin_allocate( REGF_FILE *file, uint32_t block_size )
1479 {
1480 REGF_HBIN *hbin;
1481 SMB_STRUCT_STAT sbuf;
1482
1483 if ( !(hbin = talloc_zero( file->mem_ctx, REGF_HBIN )) )
1484 return NULL;
1485
1486 memcpy( hbin->header, "hbin", HBIN_HDR_SIZE);
1487
1488
1489 if (sys_fstat(file->fd, &sbuf, false)) {
1490 DEBUG(0,("regf_hbin_allocate: stat() failed! (%s)\n", strerror(errno)));
1491 return NULL;
1492 }
1493
1494 hbin->file_off = sbuf.st_ex_size;
1495
1496 hbin->free_off = HBIN_HEADER_REC_SIZE;
1497 hbin->free_size = block_size - hbin->free_off + sizeof(uint32_t);
1498
1499 hbin->block_size = block_size;
1500 hbin->first_hbin_off = hbin->file_off - REGF_BLOCKSIZE;
1501
1502 if ( !prs_init( &hbin->ps, block_size, file->mem_ctx, MARSHALL ) )
1503 return NULL;
1504
1505 if ( !prs_hbin_block( "new_hbin", &hbin->ps, 0, hbin ) )
1506 return NULL;
1507
1508 if ( !write_hbin_block( file, hbin ) )
1509 return NULL;
1510
1511 file->last_block = hbin->file_off;
1512
1513 return hbin;
1514 }
1515
1516 /*******************************************************************
1517 *******************************************************************/
1518
1519 static void update_free_space( REGF_HBIN *hbin, uint32_t size_used )
1520 {
1521 hbin->free_off += size_used;
1522 hbin->free_size -= size_used;
1523
1524 if ( hbin->free_off >= hbin->block_size ) {
1525 hbin->free_off = REGF_OFFSET_NONE;
1526 }
1527
1528 return;
1529 }
1530
1531 /*******************************************************************
1532 *******************************************************************/
1533
1534 static REGF_HBIN* find_free_space( REGF_FILE *file, uint32_t size )
1535 {
1536 REGF_HBIN *hbin, *p_hbin;
1537 uint32_t block_off;
1538 bool cached;
1539
1540 /* check open block list */
1541
1542 for ( hbin=file->block_list; hbin!=NULL; hbin=hbin->next ) {
1543 /* only check blocks that actually have available space */
1544
1545 if ( hbin->free_off == REGF_OFFSET_NONE )
1546 continue;
1547
1548 /* check for a large enough available chunk */
1549
1550 if ( (hbin->block_size - hbin->free_off) >= size ) {
1551 DLIST_PROMOTE( file->block_list, hbin );
1552 goto done;
1553 }
1554 }
1555
1556 /* parse the file until we find a block with
1557 enough free space; save the last non-filled hbin */
1558
1559 block_off = REGF_BLOCKSIZE;
1560 do {
1561 /* cleanup before the next round */
1562 cached = False;
1563 if ( hbin )
1564 prs_mem_free( &hbin->ps );
1565
1566 hbin = read_hbin_block( file, block_off );
1567
1568 if ( hbin ) {
1569
1570 /* make sure that we don't already have this block in memory */
1571
1572 for ( p_hbin=file->block_list; p_hbin!=NULL; p_hbin=p_hbin->next ) {
1573 if ( p_hbin->file_off == hbin->file_off ) {
1574 cached = True;
1575 break;
1576 }
1577 }
1578
1579 block_off = hbin->file_off + hbin->block_size;
1580
1581 if ( cached ) {
1582 prs_mem_free( &hbin->ps );
1583 hbin = NULL;
1584 continue;
1585 }
1586 }
1587 /* if (cached block or (new block and not enough free space)) then continue looping */
1588 } while ( cached || (hbin && (hbin->free_size < size)) );
1589
1590 /* no free space; allocate a new one */
1591
1592 if ( !hbin ) {
1593 uint32_t alloc_size;
1594
1595 /* allocate in multiples of REGF_ALLOC_BLOCK; make sure (size + hbin_header) fits */
1596
1597 alloc_size = (((size+HBIN_HEADER_REC_SIZE) / REGF_ALLOC_BLOCK ) + 1 ) * REGF_ALLOC_BLOCK;
1598
1599 if ( !(hbin = regf_hbin_allocate( file, alloc_size )) ) {
1600 DEBUG(0,("find_free_space: regf_hbin_allocate() failed!\n"));
1601 return NULL;
1602 }
1603 DLIST_ADD( file->block_list, hbin );
1604 }
1605
1606 done:
1607 /* set the offset to be ready to write */
1608
1609 if ( !prs_set_offset( &hbin->ps, hbin->free_off-sizeof(uint32_t) ) )
1610 return NULL;
1611
1612 /* write the record size as a placeholder for now, it should be
1613 probably updated by the caller once it all of the data necessary
1614 for the record */
1615
1616 if ( !prs_uint32("allocated_size", &hbin->ps, 0, &size) )
1617 return NULL;
1618
1619 update_free_space( hbin, size );
1620
1621 return hbin;
1622 }
1623
1624 /*******************************************************************
1625 *******************************************************************/
1626
1627 static uint32_t sk_record_data_size( struct security_descriptor * sd )
1628 {
1629 uint32_t size, size_mod8;
1630
1631 size_mod8 = 0;
1632
1633 /* the record size is sizeof(hdr) + name + static members + data_size_field */
1634
1635 size = sizeof(uint32_t)*5 + ndr_size_security_descriptor(sd, 0) + sizeof(uint32_t);
1636
1637 /* multiple of 8 */
1638 size_mod8 = size & 0xfffffff8;
1639 if ( size_mod8 < size )
1640 size_mod8 += 8;
1641
1642 return size_mod8;
1643 }
1644
1645 /*******************************************************************
1646 *******************************************************************/
1647
1648 static uint32_t vk_record_data_size( REGF_VK_REC *vk )
1649 {
1650 uint32_t size, size_mod8;
1651
1652 size_mod8 = 0;
1653
1654 /* the record size is sizeof(hdr) + name + static members + data_size_field */
1655
1656 size = REC_HDR_SIZE + (sizeof(uint16_t)*3) + (sizeof(uint32_t)*3) + sizeof(uint32_t);
1657
1658 if ( vk->valuename )
1659 size += strlen(vk->valuename);
1660
1661 /* multiple of 8 */
1662 size_mod8 = size & 0xfffffff8;
1663 if ( size_mod8 < size )
1664 size_mod8 += 8;
1665
1666 return size_mod8;
1667 }
1668
1669 /*******************************************************************
1670 *******************************************************************/
1671
1672 static uint32_t lf_record_data_size( uint32_t num_keys )
1673 {
1674 uint32_t size, size_mod8;
1675
1676 size_mod8 = 0;
1677
1678 /* the record size is sizeof(hdr) + num_keys + sizeof of hash_array + data_size_uint32_t */
1679
1680 size = REC_HDR_SIZE + sizeof(uint16_t) + (sizeof(REGF_HASH_REC) * num_keys) + sizeof(uint32_t);
1681
1682 /* multiple of 8 */
1683 size_mod8 = size & 0xfffffff8;
1684 if ( size_mod8 < size )
1685 size_mod8 += 8;
1686
1687 return size_mod8;
1688 }
1689
1690 /*******************************************************************
1691 *******************************************************************/
1692
1693 static uint32_t nk_record_data_size( REGF_NK_REC *nk )
1694 {
1695 uint32_t size, size_mod8;
1696
1697 size_mod8 = 0;
1698
1699 /* the record size is static + length_of_keyname + length_of_classname + data_size_uint32_t */
1700
1701 size = 0x4c + strlen(nk->keyname) + sizeof(uint32_t);
1702
1703 if ( nk->classname )
1704 size += strlen( nk->classname );
1705
1706 /* multiple of 8 */
1707 size_mod8 = size & 0xfffffff8;
1708 if ( size_mod8 < size )
1709 size_mod8 += 8;
1710
1711 return size_mod8;
1712 }
1713
1714 /*******************************************************************
1715 *******************************************************************/
1716
1717 static bool create_vk_record(REGF_FILE *file, REGF_VK_REC *vk,
1718 struct regval_blob *value)
1719 {
1720 char *name = regval_name(value);
1721 REGF_HBIN *data_hbin;
1722
1723 ZERO_STRUCTP( vk );
1724
1725 memcpy( vk->header, "vk", REC_HDR_SIZE );
1726
1727 if ( name ) {
1728 vk->valuename = talloc_strdup( file->mem_ctx, regval_name(value) );
1729 vk->flag = VK_FLAG_NAME_PRESENT;
1730 }
1731
1732 vk->data_size = regval_size( value );
1733 vk->type = regval_type( value );
1734
1735 if ( vk->data_size > sizeof(uint32_t) ) {
1736 uint32_t data_size = ( (vk->data_size+sizeof(uint32_t)) & 0xfffffff8 ) + 8;
1737
1738 vk->data = (uint8_t *)talloc_memdup( file->mem_ctx,
1739 regval_data_p(value),
1740 vk->data_size );
1741 if (vk->data == NULL) {
1742 return False;
1743 }
1744
1745 /* go ahead and store the offset....we'll pick this hbin block back up when
1746 we stream the data */
1747
1748 if ((data_hbin = find_free_space(file, data_size )) == NULL) {
1749 return False;
1750 }
1751 vk->data_off = prs_offset( &data_hbin->ps ) + data_hbin->first_hbin_off - HBIN_HDR_SIZE;
1752 }
1753 else {
1754 /* make sure we don't try to copy from a NULL value pointer */
1755
1756 if ( vk->data_size != 0 )
1757 memcpy( &vk->data_off, regval_data_p(value), vk->data_size);
1758 vk->data_size |= VK_DATA_IN_OFFSET;
1759 }
1760
1761 return True;
1762 }
1763
1764 /*******************************************************************
1765 *******************************************************************/
1766
1767 static int hashrec_cmp( REGF_HASH_REC *h1, REGF_HASH_REC *h2 )
1768 {
1769 return strcasecmp_m( h1->fullname, h2->fullname );
1770 }
1771
1772 /*******************************************************************
1773 *******************************************************************/
1774
1775 REGF_NK_REC* regfio_write_key( REGF_FILE *file, const char *name,
1776 struct regval_ctr *values, struct regsubkey_ctr *subkeys,
1777 struct security_descriptor *sec_desc, REGF_NK_REC *parent )
1778 {
1779 REGF_NK_REC *nk;
1780 REGF_HBIN *vlist_hbin = NULL;
1781 uint32_t size;
1782
1783 if ( !(nk = talloc_zero( file->mem_ctx, REGF_NK_REC )) )
1784 return NULL;
1785
1786 memcpy( nk->header, "nk", REC_HDR_SIZE );
1787
1788 if ( !parent )
1789 nk->key_type = NK_TYPE_ROOTKEY;
1790 else
1791 nk->key_type = NK_TYPE_NORMALKEY;
1792
1793 /* store the parent offset (or -1 if a the root key */
1794
1795 nk->parent_off = parent ? (parent->hbin_off + parent->hbin->file_off - REGF_BLOCKSIZE - HBIN_HDR_SIZE ) : REGF_OFFSET_NONE;
1796
1797 /* no classname currently */
1798
1799 nk->classname_off = REGF_OFFSET_NONE;
1800 nk->classname = NULL;
1801 nk->keyname = talloc_strdup( file->mem_ctx, name );
1802
1803 /* current modification time */
1804
1805 unix_to_nt_time( &nk->mtime, time(NULL) );
1806
1807 /* allocate the record on disk */
1808
1809 size = nk_record_data_size( nk );
1810 nk->rec_size = ( size - 1 ) ^ 0XFFFFFFFF;
1811 if ((nk->hbin = find_free_space( file, size )) == NULL) {
1812 return NULL;
1813 }
1814 nk->hbin_off = prs_offset( &nk->hbin->ps );
1815
1816 /* Update the hash record in the parent */
1817
1818 if ( parent ) {
1819 REGF_HASH_REC *hash = &parent->subkeys.hashes[parent->subkey_index];
1820
1821 hash->nk_off = prs_offset( &nk->hbin->ps ) + nk->hbin->first_hbin_off - HBIN_HDR_SIZE;
1822 memcpy(hash->keycheck, name, MIN(strlen(name),sizeof(uint32_t)));
1823 hash->fullname = talloc_strdup( file->mem_ctx, name );
1824 parent->subkey_index++;
1825
1826 /* sort the list by keyname */
1827 TYPESAFE_QSORT(parent->subkeys.hashes, parent->subkey_index, hashrec_cmp);
1828
1829 if ( !hbin_prs_lf_records( "lf_rec", parent->subkeys.hbin, 0, parent ) )
1830 return NULL;
1831 }
1832
1833 /* write the security descriptor */
1834
1835 nk->sk_off = REGF_OFFSET_NONE;
1836 if ( sec_desc ) {
1837 uint32_t sk_size = sk_record_data_size( sec_desc );
1838 REGF_HBIN *sk_hbin;
1839
1840 /* search for it in the existing list of sd's */
1841
1842 if ( (nk->sec_desc = find_sk_record_by_sec_desc( file, sec_desc )) == NULL ) {
1843 /* not found so add it to the list */
1844
1845 if (!(sk_hbin = find_free_space( file, sk_size ))) {
1846 return NULL;
1847 }
1848
1849 if ( !(nk->sec_desc = talloc_zero( file->mem_ctx, REGF_SK_REC )) )
1850 return NULL;
1851
1852 /* now we have to store the security descriptor in the list and
1853 update the offsets */
1854
1855 memcpy( nk->sec_desc->header, "sk", REC_HDR_SIZE );
1856 nk->sec_desc->hbin = sk_hbin;
1857 nk->sec_desc->hbin_off = prs_offset( &sk_hbin->ps );
1858 nk->sec_desc->sk_off = prs_offset( &sk_hbin->ps ) + sk_hbin->first_hbin_off - HBIN_HDR_SIZE;
1859 nk->sec_desc->rec_size = (sk_size-1) ^ 0xFFFFFFFF;
1860
1861 nk->sec_desc->sec_desc = sec_desc;
1862 nk->sec_desc->ref_count = 0;
1863
1864 /* size value must be self-inclusive */
1865 nk->sec_desc->size = ndr_size_security_descriptor(sec_desc, 0)
1866 + sizeof(uint32_t);
1867
1868 DLIST_ADD_END( file->sec_desc_list, nk->sec_desc);
1869
1870 /* update the offsets for us and the previous sd in the list.
1871 if this is the first record, then just set the next and prev
1872 offsets to ourself. */
1873
1874 if ( DLIST_PREV(nk->sec_desc) ) {
1875 REGF_SK_REC *prev = DLIST_PREV(nk->sec_desc);
1876
1877 nk->sec_desc->prev_sk_off = prev->hbin_off + prev->hbin->first_hbin_off - HBIN_HDR_SIZE;
1878 prev->next_sk_off = nk->sec_desc->sk_off;
1879
1880 /* the end must loop around to the front */
1881 nk->sec_desc->next_sk_off = file->sec_desc_list->sk_off;
1882
1883 /* and first must loop around to the tail */
1884 file->sec_desc_list->prev_sk_off = nk->sec_desc->sk_off;
1885 } else {
1886 nk->sec_desc->prev_sk_off = nk->sec_desc->sk_off;
1887 nk->sec_desc->next_sk_off = nk->sec_desc->sk_off;
1888 }
1889 }
1890
1891 /* bump the reference count +1 */
1892
1893 nk->sk_off = nk->sec_desc->sk_off;
1894 nk->sec_desc->ref_count++;
1895 }
1896
1897 /* write the subkeys */
1898
1899 nk->subkeys_off = REGF_OFFSET_NONE;
1900 if ( (nk->num_subkeys = regsubkey_ctr_numkeys( subkeys )) != 0 ) {
1901 uint32_t lf_size = lf_record_data_size( nk->num_subkeys );
1902 uint32_t namelen;
1903 int i;
1904
1905 if (!(nk->subkeys.hbin = find_free_space( file, lf_size ))) {
1906 return NULL;
1907 }
1908 nk->subkeys.hbin_off = prs_offset( &nk->subkeys.hbin->ps );
1909 nk->subkeys.rec_size = (lf_size-1) ^ 0xFFFFFFFF;
1910 nk->subkeys_off = prs_offset( &nk->subkeys.hbin->ps ) + nk->subkeys.hbin->first_hbin_off - HBIN_HDR_SIZE;
1911
1912 memcpy( nk->subkeys.header, "lf", REC_HDR_SIZE );
1913
1914 nk->subkeys.num_keys = nk->num_subkeys;
1915 if (nk->subkeys.num_keys) {
1916 if ( !(nk->subkeys.hashes = talloc_zero_array( file->mem_ctx, REGF_HASH_REC, nk->subkeys.num_keys )) )
1917 return NULL;
1918 } else {
1919 nk->subkeys.hashes = NULL;
1920 }
1921 nk->subkey_index = 0;
1922
1923 /* update the max_bytes_subkey{name,classname} fields */
1924 for ( i=0; i<nk->num_subkeys; i++ ) {
1925 namelen = strlen( regsubkey_ctr_specific_key(subkeys, i) );
1926 if ( namelen*2 > nk->max_bytes_subkeyname )
1927 nk->max_bytes_subkeyname = namelen * 2;
1928 }
1929 }
1930
1931 /* write the values */
1932
1933 nk->values_off = REGF_OFFSET_NONE;
1934 if ( (nk->num_values = regval_ctr_numvals( values )) != 0 ) {
1935 uint32_t vlist_size = ( ( nk->num_values * sizeof(uint32_t) ) & 0xfffffff8 ) + 8;
1936 int i;
1937
1938 if (!(vlist_hbin = find_free_space( file, vlist_size ))) {
1939 return NULL;
1940 }
1941 nk->values_off = prs_offset( &vlist_hbin->ps ) + vlist_hbin->first_hbin_off - HBIN_HDR_SIZE;
1942
1943 if (nk->num_values) {
1944 if ( !(nk->values = talloc_array( file->mem_ctx, REGF_VK_REC, nk->num_values )) )
1945 return NULL;
1946 } else {
1947 nk->values = NULL;
1948 }
1949
1950 /* create the vk records */
1951
1952 for ( i=0; i<nk->num_values; i++ ) {
1953 uint32_t vk_size, namelen, datalen;
1954 struct regval_blob *r;
1955
1956 r = regval_ctr_specific_value( values, i );
1957 create_vk_record( file, &nk->values[i], r );
1958 vk_size = vk_record_data_size( &nk->values[i] );
1959 nk->values[i].hbin = find_free_space( file, vk_size );
1960 nk->values[i].hbin_off = prs_offset( &nk->values[i].hbin->ps );
1961 nk->values[i].rec_size = ( vk_size - 1 ) ^ 0xFFFFFFFF;
1962 nk->values[i].rec_off = prs_offset( &nk->values[i].hbin->ps )
1963 + nk->values[i].hbin->first_hbin_off
1964 - HBIN_HDR_SIZE;
1965
1966 /* update the max bytes fields if necessary */
1967
1968 namelen = strlen( regval_name(r) );
1969 if ( namelen*2 > nk->max_bytes_valuename )
1970 nk->max_bytes_valuename = namelen * 2;
1971
1972 datalen = regval_size( r );
1973 if ( datalen > nk->max_bytes_value )
1974 nk->max_bytes_value = datalen;
1975 }
1976 }
1977
1978 /* stream the records */
1979
1980 prs_set_offset( &nk->hbin->ps, nk->hbin_off );
1981 if ( !prs_nk_rec( "nk_rec", &nk->hbin->ps, 0, nk ) )
1982 return NULL;
1983
1984 if ( nk->num_values ) {
1985 if ( !hbin_prs_vk_records( "vk_records", vlist_hbin, 0, nk, file ) )
1986 return NULL;
1987 }
1988
1989
1990 regfio_flush( file );
1991
1992 return nk;
1993 }
1994
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