source: trunk/include/regfi.h @ 135

/*
 * Branched from Samba project Subversion repository, version #6903:
 *   http://viewcvs.samba.org/cgi-bin/viewcvs.cgi/trunk/source/include/regfio.h?rev=6903&view=auto
 *
 * Windows NT (and later) registry parsing library
 *
 * Copyright (C) 2005-2009 Timothy D. Morgan
 * Copyright (C) 2005 Gerald (Jerry) Carter
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 3 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id: regfi.h 135 2009-01-21 10:27:32Z tim $
 */

/************************************************************
 * Most of this information was obtained from 
 * http://www.wednesday.demon.co.uk/dosreg.html
 * Thanks Nigel!
 ***********************************************************/

#ifndef _REGFI_H
#define _REGFI_H

#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <assert.h>

#include "smb_deps.h"
#include "winsec.h"
#include "void_stack.h"
#include "range_list.h"
#include "lru_cache.h"

/******************************************************************************/
/* Macros */
 
/* Registry data types */
#define REG_NONE                       0
#define REG_SZ                         1
#define REG_EXPAND_SZ                  2
#define REG_BINARY                     3
#define REG_DWORD                      4
#define REG_DWORD_LE                   4  /* DWORD, little endian */
#define REG_DWORD_BE                   5  /* DWORD, big endian */
#define REG_LINK                       6
#define REG_MULTI_SZ                   7
#define REG_RESOURCE_LIST              8
#define REG_FULL_RESOURCE_DESCRIPTOR   9
#define REG_RESOURCE_REQUIREMENTS_LIST 10
#define REG_QWORD                      11 /* 64-bit little endian */
/* XXX: Has MS defined a REG_QWORD_BE? */
/* Not a real type in the registry */
#define REG_KEY                        0x7FFFFFFF

#define REGFI_REGF_SIZE            0x1000 /* "regf" header block size */
#define REGFI_HBIN_ALLOC           0x1000 /* Minimum allocation unit for HBINs */
#define REGFI_MAX_DEPTH            512
#define REGFI_OFFSET_NONE          0xffffffff

/* Header sizes and magic number lengths for various records */
#define REGFI_REGF_MAGIC_SIZE      4
#define REGFI_HBIN_MAGIC_SIZE      4
#define REGFI_CELL_MAGIC_SIZE      2
#define REGFI_HBIN_HEADER_SIZE     0x20
#define REGFI_NK_MIN_LENGTH        0x4C
#define REGFI_VK_MIN_LENGTH        0x14
#define REGFI_SK_MIN_LENGTH        0x14
#define REGFI_SUBKEY_LIST_MIN_LEN  0x4


/* Constants used for validation */
/* XXX: Can we add clock resolution validation as well as range?  It has
 *      been reported that Windows timestamps are never more than a
 *      certain granularity (250ms?), which could be used to help
 *      eliminate false positives.  Would need to validate this and
 *      perhaps conservatively implement a check.
 */
 /* Minimum time is Jan 1, 1990 00:00:00 */
#define REGFI_MTIME_MIN_HIGH       0x01B41E6D
#define REGFI_MTIME_MIN_LOW        0x26F98000
 /* Maximum time is Jan 1, 2290 00:00:00
  * (We hope no one is using Windows by then...) 
  */
#define REGFI_MTIME_MAX_HIGH       0x03047543
#define REGFI_MTIME_MAX_LOW        0xC80A4000


/* Flags for the vk records */
#define REGFI_VK_FLAG_NAME_PRESENT 0x0001
#define REGFI_VK_DATA_IN_OFFSET    0x80000000
#define REGFI_VK_MAX_DATA_LENGTH   1024*1024

/* NK record types */
#define REGFI_NK_TYPE_LINKKEY      0x0010
#define REGFI_NK_TYPE_NORMALKEY    0x0020
 /* XXX: Unknown key type that shows up in Vista registries */
#define REGFI_NK_TYPE_UNKNOWN1     0x1020
#define REGFI_NK_TYPE_ROOTKEY1     0x002c
 /* XXX: Unknown root key type that shows up in Vista registries */
#define REGFI_NK_TYPE_ROOTKEY2     0x00ac


/* HBIN block */
typedef struct _regfi_hbin 
{
  uint32 file_off;       /* my offset in the registry file */
  uint32 ref_count;      /* how many active records are pointing to this
                          * block (not used currently) 
                          */
  
  uint32 first_hbin_off; /* offset from first hbin block */
  uint32 block_size;     /* block size of this block 
                          * Should be a multiple of 4096 (0x1000)
                          */
  uint32 next_block;     /* relative offset to next block.  
                          * NOTE: This value may be unreliable!
                          */

  uint8 magic[REGFI_HBIN_MAGIC_SIZE]; /* "hbin" */
} REGFI_HBIN;


/* Subkey List -- list of key offsets and hashed names for consistency */
typedef struct 
{
  uint32 nk_off;
  uint32 hash;
} REGFI_SUBKEY_LIST_ELEM;


typedef struct 
{
  uint32 offset;        /* Real offset of this record's cell in the file */
  uint32 cell_size;      /* ((start_offset - end_offset) & 0xfffffff8) */
  uint32 num_keys;
  REGFI_SUBKEY_LIST_ELEM* elements;
  
  uint8 magic[REGFI_CELL_MAGIC_SIZE];
} REGFI_SUBKEY_LIST;


/* Key Value */
typedef struct 
{
  uint32 offset;        /* Real offset of this record's cell in the file */
  uint32 cell_size;     /* ((start_offset - end_offset) & 0xfffffff8) */

  REGFI_HBIN* hbin;     /* pointer to HBIN record (in memory) containing 
                         * this nk record 
                         */
  uint8* data;
  uint16 name_length;
  char*  valuename;
  uint32 hbin_off;      /* offset from beginning of this hbin block */
  
  uint32 data_size;
  uint32 data_off;      /* offset of data cell (virtual) */
  uint32 type;
  uint8  magic[REGFI_CELL_MAGIC_SIZE];
  uint16 flag;
  uint16 unknown1;
  bool data_in_offset;
} REGFI_VK_REC;


/* Key Security */
struct _regfi_sk_rec;

typedef struct _regfi_sk_rec 
{
  uint32 offset;        /* Real file offset of this record */
  uint32 cell_size;     /* ((start_offset - end_offset) & 0xfffffff8) */

  WINSEC_DESC* sec_desc;
  uint32 hbin_off;      /* offset from beginning of this hbin block */
  
  uint32 sk_off;        /* offset parsed from NK record used as a key
                         * to lookup reference to this SK record 
                         */
  
  uint32 prev_sk_off;
  uint32 next_sk_off;
  uint32 ref_count;
  uint32 desc_size;     /* size of security descriptor */
  uint16 unknown_tag;
  uint8  magic[REGFI_CELL_MAGIC_SIZE];
} REGFI_SK_REC;


/* Key Name */
typedef struct
{
  uint32 offset;        /* Real offset of this record's cell in the file */
  uint32 cell_size;     /* Actual or estimated length of the cell.  
                         * Always in multiples of 8. 
                         */

  /* link in the other records here */
  REGFI_VK_REC** values;
  REGFI_SUBKEY_LIST* subkeys;
  
  /* header information */
  uint16 key_type;
  uint8  magic[REGFI_CELL_MAGIC_SIZE];
  NTTIME mtime;
  uint16 name_length;
  uint16 classname_length;
  char* classname;
  char* keyname;
  uint32 parent_off;                /* pointer to parent key */
  uint32 classname_off;
  
  /* max lengths */
  uint32 max_bytes_subkeyname;      /* max subkey name * 2 */
  uint32 max_bytes_subkeyclassname; /* max subkey classname length (as if) */
  uint32 max_bytes_valuename;       /* max valuename * 2 */
  uint32 max_bytes_value;           /* max value data size */
  
  /* unknowns */
  uint32 unknown1;
  uint32 unknown2;
  uint32 unknown3;
  uint32 unk_index;                 /* nigel says run time index ? */
  
  /* children */
  uint32 num_subkeys;
  uint32 subkeys_off;   /* offset of subkey list that points to NK records */
  uint32 num_values;
  uint32 values_off;    /* value lists which point to VK records */
  uint32 sk_off;        /* offset to SK record */
} REGFI_NK_REC;



/* REGF block */
typedef struct 
{
  /* Run-time information */
  /************************/
  int fd;         /* file descriptor */

  /* Experimental hbin lists */
  range_list* hbins;

  /* Error/warning/info messages returned by lower layer functions */
  char* last_message;

  /* For sanity checking (not part of the registry header) */
  uint32 file_length;


  /* Data parsed from file header */
  /********************************/
  uint8  magic[REGFI_REGF_MAGIC_SIZE];/* "regf" */
  NTTIME mtime;
  uint32 data_offset;           /* offset to record in the first (or any?) 
                                 * hbin block 
                                 */
  uint32 last_block;            /* offset to last hbin block in file */

  uint32 checksum;              /* Stored checksum. */
  uint32 computed_checksum;     /* Our own calculation of the checksum.
                                 * (XOR of bytes 0x0000 - 0x01FB) 
                                 */
  
  /* unknown data structure values */
  uint32 unknown1;
  uint32 unknown2;
  uint32 unknown3;
  uint32 unknown4;
  uint32 unknown5;
  uint32 unknown6;
  uint32 unknown7;
} REGFI_FILE;



typedef struct 
{
  REGFI_FILE* f;
  void_stack* key_positions;
  lru_cache* sk_recs;
  REGFI_NK_REC* cur_key;
  uint32 cur_subkey;
  uint32 cur_value;
} REGFI_ITERATOR;


typedef struct 
{
  /* XXX: Should probably eliminate the storage of keys here 
   *      once key caching is implemented. 
   */
  REGFI_NK_REC* nk;
  uint32 cur_subkey;
  /* We could store a cur_value here as well, but didn't see 
   * the use in it right now.
   */
} REGFI_ITER_POSITION;


/******************************************************************************/
/*                         Main iterator API                                  */
/******************************************************************************/
REGFI_FILE*           regfi_open(const char* filename);
int                   regfi_close(REGFI_FILE* r);

/* regfi_get_message: Get errors, warnings, and/or verbose information
 *                    relating to processing of the given registry file.
 *
 * Arguments:
 *   file     -- the structure for the registry file
 *
 * Returns:
 *   A newly allocated char* which must be free()d by the caller.
 */
char*                 regfi_get_message(REGFI_FILE* file);

REGFI_ITERATOR*       regfi_iterator_new(REGFI_FILE* fh);
void                  regfi_iterator_free(REGFI_ITERATOR* i);
bool                  regfi_iterator_down(REGFI_ITERATOR* i);
bool                  regfi_iterator_up(REGFI_ITERATOR* i);
bool                  regfi_iterator_to_root(REGFI_ITERATOR* i);

bool                  regfi_iterator_find_subkey(REGFI_ITERATOR* i, 
                                                 const char* subkey_name);
bool                  regfi_iterator_walk_path(REGFI_ITERATOR* i, 
                                               const char** path);
const REGFI_NK_REC*   regfi_iterator_cur_key(REGFI_ITERATOR* i);
const REGFI_SK_REC*   regfi_iterator_cur_sk(REGFI_ITERATOR* i);
const REGFI_NK_REC*   regfi_iterator_first_subkey(REGFI_ITERATOR* i);
const REGFI_NK_REC*   regfi_iterator_cur_subkey(REGFI_ITERATOR* i);
const REGFI_NK_REC*   regfi_iterator_next_subkey(REGFI_ITERATOR* i);

bool                  regfi_iterator_find_value(REGFI_ITERATOR* i, 
                                                const char* value_name);
const REGFI_VK_REC*   regfi_iterator_first_value(REGFI_ITERATOR* i);
const REGFI_VK_REC*   regfi_iterator_cur_value(REGFI_ITERATOR* i);
const REGFI_VK_REC*   regfi_iterator_next_value(REGFI_ITERATOR* i);


/********************************************************/
/* Middle-layer structure caching, loading, and linking */
/********************************************************/
REGFI_HBIN*           regfi_lookup_hbin(REGFI_FILE* file, uint32 offset);
REGFI_NK_REC*         regfi_load_key(REGFI_FILE* file, uint32 offset, 
                                     bool strict);
REGFI_SUBKEY_LIST*    regfi_load_subkeylist(REGFI_FILE* file, uint32 offset, 
                                            uint32 num_keys, uint32 max_size, 
                                            bool strict);
REGFI_VK_REC**        regfi_load_valuelist(REGFI_FILE* file, uint32 offset, 
                                           uint32 num_values, uint32 max_size, 
                                           bool strict);

/************************************/
/*  Low-layer data structure access */
/************************************/
REGFI_FILE*           regfi_parse_regf(int fd, bool strict);
REGFI_HBIN*           regfi_parse_hbin(REGFI_FILE* file, uint32 offset, 
                                       bool strict);


/* regfi_parse_nk: Parses an NK record.
 *
 * Arguments:
 *   f        -- the registry file structure
 *   offset   -- the offset of the cell (not the record) to be parsed.
 *   max_size -- the maximum size the NK cell could be. (for validation)
 *   strict   -- if true, rejects any malformed records.  Otherwise,
 *               tries to minimally validate integrity.
 * Returns:
 *   A newly allocated NK record structure, or NULL on failure.
 */
REGFI_NK_REC*         regfi_parse_nk(REGFI_FILE* file, uint32 offset, 
                                     uint32 max_size, bool strict);

REGFI_VK_REC*         regfi_parse_vk(REGFI_FILE* file, uint32 offset, 
                                     uint32 max_size, bool strict);

uint8*                regfi_parse_data(REGFI_FILE* file, uint32 offset, 
                                       uint32 length, uint32 max_size, 
                                       bool strict);

REGFI_SK_REC*         regfi_parse_sk(REGFI_FILE* file, uint32 offset, 
                                     uint32 max_size, bool strict);

range_list*           regfi_parse_unalloc_cells(REGFI_FILE* file);

bool                  regfi_parse_cell(int fd, uint32 offset, 
                                       uint8* hdr, uint32 hdr_len,
                                       uint32* cell_length, bool* unalloc);

char*                 regfi_parse_classname(REGFI_FILE* file, uint32 offset,
                                            uint16* name_length, 
                                            uint32 max_size, bool strict);


/************************************/
/*    Private Functions             */
/************************************/
REGFI_NK_REC*         regfi_rootkey(REGFI_FILE* file);
void                  regfi_key_free(REGFI_NK_REC* nk);
void                  regfi_subkeylist_free(REGFI_SUBKEY_LIST* list);
uint32                regfi_read(int fd, uint8* buf, uint32* length);

const char*           regfi_type_val2str(unsigned int val);
int                   regfi_type_str2val(const char* str);

char*                 regfi_get_sacl(WINSEC_DESC* sec_desc);
char*                 regfi_get_dacl(WINSEC_DESC* sec_desc);
char*                 regfi_get_owner(WINSEC_DESC* sec_desc);
char*                 regfi_get_group(WINSEC_DESC* sec_desc);

REGFI_SUBKEY_LIST*    regfi_merge_subkeylists(uint16 num_lists, 
                                              REGFI_SUBKEY_LIST** lists,
                                              bool strict);
void                  regfi_add_message(REGFI_FILE* file, const char* error);
#endif  /* _REGFI_H */