source: trunk/include/regfi.h @ 118

Last change on this file since 118 was 116, checked in by tim, 16 years ago

fixed major bug in reglookup-recover; now recovers much more data
rolled back release version to 0.9.0
added date range checking in regfi's NK parsing for deleted records
  • Property svn:keywords set to Id
File size: 12.1 KB
Line 
1/*
2 * Branched from Samba project, Subversion repository version #6903:
3 *   http://viewcvs.samba.org/cgi-bin/viewcvs.cgi/trunk/source/include/regfio.h?rev=6903&view=auto
4 *
5 * Unix SMB/CIFS implementation.
6 * Windows NT registry I/O library
7 *
8 * Copyright (C) 2005-2008 Timothy D. Morgan
9 * Copyright (C) 2005 Gerald (Jerry) Carter
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; version 2 of the License.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 *
24 * $Id: regfi.h 116 2008-08-03 19:34:27Z tim $
25 */
26
27/************************************************************
28 * Most of this information was obtained from
29 * http://www.wednesday.demon.co.uk/dosreg.html
30 * Thanks Nigel!
31 ***********************************************************/
32
33#ifndef _REGFI_H
34#define _REGFI_H
35
36#include <stdlib.h>
37#include <stdio.h>
38#include <stdbool.h>
39#include <string.h>
40#include <errno.h>
41#include <time.h>
42#include <fcntl.h>
43#include <sys/stat.h>
44#include <sys/types.h>
45#include <unistd.h>
46#include <assert.h>
47
48#include "smb_deps.h"
49#include "void_stack.h"
50#include "range_list.h"
51#include "lru_cache.h"
52
53/******************************************************************************/
54/* Macros */
55 
56/* Registry data types */
57#define REG_NONE                       0
58#define REG_SZ                         1
59#define REG_EXPAND_SZ                  2
60#define REG_BINARY                     3
61#define REG_DWORD                      4
62#define REG_DWORD_LE                   4  /* DWORD, little endian */
63#define REG_DWORD_BE                   5  /* DWORD, big endian */
64#define REG_LINK                       6
65#define REG_MULTI_SZ                   7
66#define REG_RESOURCE_LIST              8
67#define REG_FULL_RESOURCE_DESCRIPTOR   9
68#define REG_RESOURCE_REQUIREMENTS_LIST 10
69#define REG_QWORD                      11 /* 64-bit little endian */
70/* XXX: Has MS defined a REG_QWORD_BE? */
71/* Not a real type in the registry */
72#define REG_KEY                        0x7FFFFFFF
73
74#define REGF_BLOCKSIZE             0x1000
75#define REGF_ALLOC_BLOCK           0x1000 /* Minimum allocation unit for HBINs */
76#define REGF_MAX_DEPTH             512
77
78/* header sizes for various records */
79#define REGF_MAGIC_SIZE            4
80#define HBIN_MAGIC_SIZE            4
81#define HBIN_HEADER_REC_SIZE       0x20
82#define REC_HDR_SIZE               2
83
84#define REGF_OFFSET_NONE           0xffffffff
85#define REGFI_NK_MIN_LENGTH        0x4C
86#define REGFI_VK_MIN_LENGTH        0x14
87#define REGFI_SK_MIN_LENGTH        0x14
88#define REGFI_HASH_LIST_MIN_LENGTH 0x4
89
90/* Constants used for validation */
91 /* Minimum time is Jan 1, 1990 00:00:00 */
92#define REGFI_MTIME_MIN_HIGH       0x01B41E6D
93#define REGFI_MTIME_MIN_LOW        0x26F98000
94 /* Maximum time is Jan 1, 2290 00:00:00
95  * (We hope no one is using Windows by then...)
96  */
97#define REGFI_MTIME_MAX_HIGH       0x03047543
98#define REGFI_MTIME_MAX_LOW        0xC80A4000
99
100
101/* Flags for the vk records */
102#define VK_FLAG_NAME_PRESENT       0x0001
103#define VK_DATA_IN_OFFSET          0x80000000
104#define VK_MAX_DATA_LENGTH         1024*1024
105
106/* NK record types */
107#define NK_TYPE_LINKKEY            0x0010
108#define NK_TYPE_NORMALKEY          0x0020
109#define NK_TYPE_ROOTKEY            0x002c
110 /* TODO: Unknown type that shows up in Vista registries */
111#define NK_TYPE_UNKNOWN1           0x1020
112
113
114/* HBIN block */
115typedef struct regf_hbin
116{
117  uint32 file_off;       /* my offset in the registry file */
118  uint32 ref_count;      /* how many active records are pointing to this
119                          * block (not used currently)
120                          */
121 
122  uint32 first_hbin_off; /* offset from first hbin block */
123  uint32 block_size;     /* block size of this block
124                          * Should be a multiple of 4096 (0x1000)
125                          */
126  uint32 next_block;     /* relative offset to next block. 
127                          * NOTE: This value may be unreliable!
128                          */
129
130  uint8 magic[HBIN_MAGIC_SIZE]; /* "hbin" */
131} REGF_HBIN;
132
133
134/* Hash List -- list of key offsets and hashed names for consistency */
135typedef struct 
136{
137  uint32 nk_off;
138  uint32 hash;
139} REGF_HASH_LIST_ELEM;
140
141
142typedef struct 
143{
144  uint32 offset;        /* Real offset of this record's cell in the file */
145  uint32 cell_size;      /* ((start_offset - end_offset) & 0xfffffff8) */
146  REGF_HBIN* hbin;       /* pointer to HBIN record (in memory) containing
147                          * this nk record
148                          */
149  uint32 hbin_off;       /* offset from beginning of this hbin block */
150  REGF_HASH_LIST_ELEM* hashes;
151 
152  uint8 magic[REC_HDR_SIZE];
153  uint16 num_keys;
154} REGF_HASH_LIST;
155
156
157/* Key Value */
158typedef struct 
159{
160  uint32 offset;        /* Real offset of this record's cell in the file */
161  uint32 cell_size;     /* ((start_offset - end_offset) & 0xfffffff8) */
162
163  REGF_HBIN* hbin;      /* pointer to HBIN record (in memory) containing
164                         * this nk record
165                         */
166  uint8* data;
167  uint16 name_length;
168  char*  valuename;
169  uint32 hbin_off;      /* offset from beginning of this hbin block */
170 
171  uint32 data_size;
172  uint32 data_off;      /* offset of data cell (virtual) */
173  uint32 type;
174  uint8  magic[REC_HDR_SIZE];
175  uint16 flag;
176  uint16 unknown1;
177  bool data_in_offset;
178} REGF_VK_REC;
179
180
181/* Key Security */
182struct _regf_sk_rec;
183
184typedef struct _regf_sk_rec
185{
186  uint32 offset;        /* Real file offset of this record */
187  uint32 cell_size;     /* ((start_offset - end_offset) & 0xfffffff8) */
188
189  SEC_DESC* sec_desc;
190  uint32 hbin_off;      /* offset from beginning of this hbin block */
191 
192  uint32 sk_off;        /* offset parsed from NK record used as a key
193                         * to lookup reference to this SK record
194                         */
195 
196  uint32 prev_sk_off;
197  uint32 next_sk_off;
198  uint32 ref_count;
199  uint32 desc_size;     /* size of security descriptor */
200  uint16 unknown_tag;
201  uint8  magic[REC_HDR_SIZE];
202} REGF_SK_REC;
203
204
205/* Key Name */
206typedef struct
207{
208  uint32 offset;        /* Real offset of this record's cell in the file */
209  uint32 cell_size;     /* Actual or estimated length of the cell. 
210                         * Always in multiples of 8.
211                         */
212
213  /* link in the other records here */
214  REGF_VK_REC** values;
215  REGF_HASH_LIST* subkeys;
216 
217  /* header information */
218  /* XXX: should we be looking for types other than the root key type? */
219  uint16 key_type;
220  uint8  magic[REC_HDR_SIZE];
221  NTTIME mtime;
222  uint16 name_length;
223  uint16 classname_length;
224  char* classname;
225  char* keyname;
226  uint32 parent_off;    /* back pointer in registry hive */
227  uint32 classname_off; 
228 
229  /* max lengths */
230  uint32 max_bytes_subkeyname;      /* max subkey name * 2 */
231  uint32 max_bytes_subkeyclassname; /* max subkey classname length (as if) */
232  uint32 max_bytes_valuename;       /* max valuename * 2 */
233  uint32 max_bytes_value;           /* max value data size */
234 
235  /* unknowns */
236  uint32 unknown1;
237  uint32 unknown2;
238  uint32 unknown3;
239  uint32 unk_index;                 /* nigel says run time index ? */
240 
241  /* children */
242  uint32 num_subkeys;
243  uint32 subkeys_off;   /* hash records that point to NK records */     
244  uint32 num_values;
245  uint32 values_off;    /* value lists which point to VK records */
246  uint32 sk_off;        /* offset to SK record */ 
247} REGF_NK_REC;
248
249
250
251/* REGF block */
252typedef struct 
253{
254  /* run time information */
255  int fd;         /* file descriptor */
256  /* For sanity checking (not part of the registry header) */
257  uint32 file_length;
258  void* mem_ctx;  /* memory context for run-time file access information */
259
260  /* Experimental hbin lists */
261  range_list* hbins;
262
263  /* file format information */ 
264  uint8  magic[REGF_MAGIC_SIZE];/* "regf" */
265  NTTIME mtime;
266  uint32 data_offset;           /* offset to record in the first (or any?)
267                                 * hbin block
268                                 */
269  uint32 last_block;            /* offset to last hbin block in file */
270
271  uint32 checksum;              /* Stored checksum. */
272  uint32 computed_checksum;     /* Our own calculation of the checksum.
273                                 * (XOR of bytes 0x0000 - 0x01FB)
274                                 */
275 
276  /* unknown data structure values */
277  uint32 unknown1;
278  uint32 unknown2;
279  uint32 unknown3;
280  uint32 unknown4;
281  uint32 unknown5;
282  uint32 unknown6;
283  uint32 unknown7;
284} REGF_FILE;
285
286
287
288typedef struct 
289{
290  REGF_FILE* f;
291  void_stack* key_positions;
292  lru_cache* sk_recs;
293  REGF_NK_REC* cur_key;
294  uint32 cur_subkey;
295  uint32 cur_value;
296} REGFI_ITERATOR;
297
298
299typedef struct 
300{
301  REGF_NK_REC* nk;
302  uint32 cur_subkey;
303  /* We could store a cur_value here as well, but didn't see
304   * the use in it right now.
305   */
306} REGFI_ITER_POSITION;
307
308
309/******************************************************************************/
310/* Function Declarations */
311/*  Main API */
312const char*           regfi_type_val2str(unsigned int val);
313int                   regfi_type_str2val(const char* str);
314
315char*                 regfi_get_sacl(SEC_DESC* sec_desc);
316char*                 regfi_get_dacl(SEC_DESC* sec_desc);
317char*                 regfi_get_owner(SEC_DESC* sec_desc);
318char*                 regfi_get_group(SEC_DESC* sec_desc);
319
320REGF_FILE*            regfi_open(const char* filename);
321int                   regfi_close(REGF_FILE* r);
322
323REGFI_ITERATOR*       regfi_iterator_new(REGF_FILE* fh);
324void                  regfi_iterator_free(REGFI_ITERATOR* i);
325bool                  regfi_iterator_down(REGFI_ITERATOR* i);
326bool                  regfi_iterator_up(REGFI_ITERATOR* i);
327bool                  regfi_iterator_to_root(REGFI_ITERATOR* i);
328
329bool                  regfi_iterator_find_subkey(REGFI_ITERATOR* i, 
330                                                 const char* subkey_name);
331bool                  regfi_iterator_walk_path(REGFI_ITERATOR* i, 
332                                               const char** path);
333const REGF_NK_REC*    regfi_iterator_cur_key(REGFI_ITERATOR* i);
334const REGF_SK_REC*    regfi_iterator_cur_sk(REGFI_ITERATOR* i);
335const REGF_NK_REC*    regfi_iterator_first_subkey(REGFI_ITERATOR* i);
336const REGF_NK_REC*    regfi_iterator_cur_subkey(REGFI_ITERATOR* i);
337const REGF_NK_REC*    regfi_iterator_next_subkey(REGFI_ITERATOR* i);
338
339bool                  regfi_iterator_find_value(REGFI_ITERATOR* i, 
340                                                const char* value_name);
341const REGF_VK_REC*    regfi_iterator_first_value(REGFI_ITERATOR* i);
342const REGF_VK_REC*    regfi_iterator_cur_value(REGFI_ITERATOR* i);
343const REGF_VK_REC*    regfi_iterator_next_value(REGFI_ITERATOR* i);
344
345/************************************/
346/*  Low-layer data structure access */
347/************************************/
348REGF_FILE*            regfi_parse_regf(int fd, bool strict);
349REGF_HBIN*            regfi_parse_hbin(REGF_FILE* file, uint32 offset, 
350                                       bool strict);
351
352
353/* regfi_parse_nk: Parses an NK record.
354 *
355 * Arguments:
356 *   f        -- the registry file structure
357 *   offset   -- the offset of the cell (not the record) to be parsed.
358 *   max_size -- the maximum size the NK cell could be. (for validation)
359 *   strict   -- if true, rejects any malformed records.  Otherwise,
360 *               tries to minimally validate integrity.
361 * Returns:
362 *   A newly allocated NK record structure, or NULL on failure.
363 */
364REGF_NK_REC*          regfi_parse_nk(REGF_FILE* file, uint32 offset, 
365                                     uint32 max_size, bool strict);
366
367
368/* Private Functions */
369REGF_NK_REC*          regfi_rootkey(REGF_FILE* file);
370void                  regfi_key_free(REGF_NK_REC* nk);
371uint32                regfi_read(int fd, uint8* buf, uint32* length);
372
373
374
375/****************/
376/* Experimental */
377/****************/
378REGF_NK_REC* regfi_load_key(REGF_FILE* file, uint32 offset, bool strict);
379
380REGF_HASH_LIST* regfi_load_hashlist(REGF_FILE* file, uint32 offset, 
381                                    uint32 num_keys, uint32 max_size, 
382                                    bool strict);
383
384REGF_VK_REC** regfi_load_valuelist(REGF_FILE* file, uint32 offset, 
385                                   uint32 num_values, uint32 max_size, 
386                                   bool strict);
387
388REGF_VK_REC* regfi_parse_vk(REGF_FILE* file, uint32 offset, 
389                            uint32 max_size, bool strict);
390
391uint8* regfi_parse_data(REGF_FILE* file, uint32 offset, 
392                        uint32 length, bool strict);
393
394REGF_SK_REC* regfi_parse_sk(REGF_FILE* file, uint32 offset, uint32 max_size, bool strict);
395
396range_list* regfi_parse_unalloc_cells(REGF_FILE* file);
397
398REGF_HBIN* regfi_lookup_hbin(REGF_FILE* file, uint32 offset);
399
400bool regfi_parse_cell(int fd, uint32 offset, uint8* hdr, uint32 hdr_len,
401                      uint32* cell_length, bool* unalloc);
402
403#endif  /* _REGFI_H */
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