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vss_catalog_manipulator.py
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vss_catalog_manipulator.py
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#!/usr/bin/env python
#
# vss_catalog_manipulator.py
# Manipulates VSS catalog file that recreated by vss_carver.py.
#
# Copyright (C) 2018-2020 Minoru Kobayashi <[email protected]> (@unkn0wnbit)
#
# This software is released under the MIT License.
# https://opensource.org/licenses/MIT
#
import argparse
import struct
import copy
import datetime
import uuid
from ctypes import *
__VERSION__ = '20200312'
vss_identifier = b'\x6B\x87\x08\x38\x76\xC1\x48\x4E\xB7\xAE\x04\x04\x6E\x6C\xC7\x52'
class CatalogBlockHeader(LittleEndianStructure):
_fields_ = (
('vssid', c_char * 16),
('version', c_uint32),
('record_type', c_uint32),
('relative_catalog_offset', c_uint64),
('current_catalog_offset', c_uint64),
('next_catalog_offset', c_uint64),
('unknown_empty', c_char * 80)
)
def __init__(self, relative=0, current=0, next_offset=0):
self.vssid = vss_identifier
self.version = 0x1
self.record_type = 0x2
self.relative_catalog_offset = relative
self.current_catalog_offset = current
self.next_catalog_offset = next_offset
self.unknown_empty = b'\x00'
class CatalogEntry0x00(LittleEndianStructure):
_fields_ = (
('catalog_entry_type', c_uint64),
('unknown', c_char * 120)
)
def __init__(self):
self.catalog_entry_type = 0x0
self.unknown = b'\x00'
class CatalogEntry0x01(LittleEndianStructure):
_fields_ = (
('catalog_entry_type', c_uint64),
('unknown', c_char * 120)
)
def __init__(self):
self.catalog_entry_type = 0x01
self.unknown = b'\x00'
class CatalogEntry0x02(LittleEndianStructure):
_fields_ = (
('catalog_entry_type', c_uint64),
('volume_size', c_uint64),
('store_guid', c_ubyte * 16),
('sequence_number', c_uint64),
('unknown_flags', c_uint64),
('shadow_copy_creation_time', c_uint64),
('unknown_empty', c_char * 72)
)
def __init__(self):
self.catalog_entry_type = 0x02
self.unknown_flags = 0x40
self.unknown_empty = b'\x00'
class CatalogEntry0x03(LittleEndianStructure):
_fields_ = (
('catalog_entry_type', c_uint64),
('store_block_list_offset', c_uint64),
('store_guid', c_ubyte * 16),
('store_header_offset', c_uint64),
('store_block_range_offset', c_uint64),
('store_current_bitmap_offset', c_uint64),
('ntfs_file_reference', c_uint64),
('allocated_size', c_uint64),
('store_previous_bitmap_offset', c_uint64),
('unknown', c_uint64),
('unknown_empty', c_char * 40)
)
def __init__(self):
self.catalog_entry_type = 0x03
self.ntfs_file_reference = 0x0
self.allocated_size = 0x0
self.store_previous_bitmap_offset = 0x0
self.unknown = 0x0
self.unknown_empty = b'\x00'
class CatalogEntry(LittleEndianStructure):
def __init__(self):
self.enable = True
self.catalog0x02 = CatalogEntry0x02()
self.catalog0x03 = CatalogEntry0x03()
def read_catalog(f_catalog):
list_catalog_entry = []
catalog_block_header = CatalogBlockHeader()
catalog_entry = CatalogEntry()
catalog_file_offset = 0
for catalog_block_offset in [0x0, 0x4000, 0x8000, 0xc000]:
f_catalog.seek(catalog_block_offset)
f_catalog.readinto(catalog_block_header)
catalog_file_offset = catalog_file_offset + 128
if not (catalog_block_header.vssid == vss_identifier and catalog_block_header.version == 0x1 and catalog_block_header.record_type == 0x2):
exit("This file is not VSS catalog.")
while catalog_file_offset < catalog_block_offset + 0x4000 - 128:
catalog_entry_type, data = struct.unpack("<QQ", f_catalog.read(16))
f_catalog.seek(-16, 1)
if catalog_entry_type == 0x2:
catalog_entry.enable = True
f_catalog.readinto(catalog_entry.catalog0x02)
f_catalog.readinto(catalog_entry.catalog0x03)
catalog_file_offset = catalog_file_offset + 128 * 2
if all(x == y for x, y in zip(catalog_entry.catalog0x02.store_guid, catalog_entry.catalog0x03.store_guid)):
list_catalog_entry.append(copy.deepcopy(catalog_entry))
else:
guid = bytearray(len(catalog_entry.catalog0x02.store_guid))
for i in range(len(catalog_entry.catalog0x02.store_guid)):
guid[i] = catalog_entry.catalog0x02.store_guid[i]
print("Catalog Entry Type 0x02 GUID: {0}".format(str(uuid.UUID(bytes_le=bytes(guid)))))
for i in range(len(catalog_entry.catalog0x03.store_guid)):
guid[i] = catalog_entry.catalog0x03.store_guid[i]
print("Catalog Entry Type 0x03 GUID: {0}".format(str(uuid.UUID(bytes_le=bytes(guid)))))
exit(" Catalog GUID doesn't match.")
elif catalog_entry_type == 0x1 and data != 0x0:
catalog_entry.enable = False
f_catalog.readinto(catalog_entry.catalog0x02)
f_catalog.readinto(catalog_entry.catalog0x03)
catalog_file_offset = catalog_file_offset + 128 * 2
list_catalog_entry.append(copy.deepcopy(catalog_entry))
else:
f_catalog.read(128)
catalog_file_offset = catalog_file_offset + 128
return list_catalog_entry
def write_catalog(f_new_catalog, list_catalog_entry):
pass
index_catalog = 0
for catalog_offset in [0x0, 0x4000, 0x8000, 0xc000]:
buf = 0x0
if catalog_offset == 0xc000:
next_block_offset = 0x0
else:
next_block_offset = catalog_offset + 0x4000
if buf == 0:
f_new_catalog.write(CatalogBlockHeader(catalog_offset, catalog_offset, next_block_offset))
buf = buf + 128
while next_block_offset - buf > 128 * 2 and index_catalog < len(list_catalog_entry):
f_new_catalog.write(list_catalog_entry[index_catalog].catalog0x02)
f_new_catalog.write(list_catalog_entry[index_catalog].catalog0x03)
buf = buf + 128 * 2
index_catalog = index_catalog + 1
if index_catalog == len(list_catalog_entry):
break
for i in range((0x4000 - buf) // 128):
f_new_catalog.write(CatalogEntry0x00())
buf = buf + 128
def print_entry(list_catalog_entry):
epoch_as_filetime = 116444736000000000 # January 1, 1970 as MS file time
hundreds_of_nanoseconds = 10000000
index = 0
for entry in list_catalog_entry:
dt = datetime.datetime.utcfromtimestamp((entry.catalog0x02.shadow_copy_creation_time - epoch_as_filetime)/hundreds_of_nanoseconds)
if entry.enable:
enable_state = "Enable"
else:
enable_state = "Disable"
guid = bytearray(len(entry.catalog0x02.store_guid))
for i in range(len(entry.catalog0x02.store_guid)):
guid[i] = entry.catalog0x02.store_guid[i]
print("[{0}] {1}, Date: {2}, GUID: {3}".format(index, enable_state, dt, str(uuid.UUID(bytes_le=bytes(guid)))))
index = index + 1
def parse_entry_number(entry_number):
list_entry_number = []
for number in entry_number.split(','):
if not ('-' in number):
list_entry_number.append(int(number))
elif '-' in number:
start, end = number.split('-')
if int(start) >= int(end):
exit("Corrupt entry number.")
for i in range(int(start), int(end) + 1):
list_entry_number.append(int(i))
else:
exit("Corrupt entry number.")
return list_entry_number
def move_entry_internal(list_catalog_entry, entry_number, destination):
hundreds_of_nanoseconds = 10000000
list_result = []
list_entry_number = parse_entry_number(entry_number)
list_entry_number.sort()
# move
for i in range(0,destination):
if i in list_entry_number:
continue
list_result.append(list_catalog_entry[i])
for i in list_entry_number:
list_result.append(list_catalog_entry[i])
for i in range(destination, len(list_catalog_entry)):
if i in list_entry_number:
continue
list_result.append(list_catalog_entry[i])
# change meta data
index = 0
sequence_number = list_result[0].catalog0x02.sequence_number
creation_time = list_result[0].catalog0x02.shadow_copy_creation_time
for entry in list_result:
entry.catalog0x02.sequence_number = sequence_number - index
entry.catalog0x02.shadow_copy_creation_time = creation_time - hundreds_of_nanoseconds * 60 * 60 * index
index = index + 1
return list_result
def remove_entry_internal(list_catalog_entry, entry_number):
list_entry_number = parse_entry_number(entry_number)
list_entry_number.sort(reverse=True)
for i in list_entry_number:
del list_catalog_entry[i]
def enable_entry_internal(list_catalog_entry, entry_number):
list_entry_number = parse_entry_number(entry_number)
for i in list_entry_number:
list_catalog_entry[i].enable = True
list_catalog_entry[i].catalog0x02.catalog_entry_type = 0x2
list_catalog_entry[i].catalog0x03.catalog_entry_type = 0x3
def disable_entry_internal(list_catalog_entry, entry_number):
list_entry_number = parse_entry_number(entry_number)
for i in list_entry_number:
list_catalog_entry[i].enable = False
list_catalog_entry[i].catalog0x02.catalog_entry_type = 0x1
list_catalog_entry[i].catalog0x03.catalog_entry_type = 0x1
def list_entry(args):
f_catalog = open(args.catalog, "rb")
list_catalog_entry = read_catalog(f_catalog)
print_entry(list_catalog_entry)
f_catalog.close()
def move_entry(args):
f_catalog = open(args.catalog, "rb")
f_new_catalog = open(args.catalog + "_move", "wb")
list_catalog_entry = read_catalog(f_catalog)
list_result = move_entry_internal(list_catalog_entry, args.entry_number, args.destination)
print_entry(list_result)
write_catalog(f_new_catalog, list_result)
f_catalog.close()
f_new_catalog.close()
def remove_entry(args):
f_catalog = open(args.catalog, "rb")
f_new_catalog = open(args.catalog + "_remove", "wb")
list_catalog_entry = read_catalog(f_catalog)
remove_entry_internal(list_catalog_entry, args.entry_number)
print_entry(list_catalog_entry)
write_catalog(f_new_catalog, list_catalog_entry)
f_catalog.close()
f_new_catalog.close()
def enable_entry(args):
f_catalog = open(args.catalog, "rb")
f_new_catalog = open(args.catalog + "_enable", "wb")
list_catalog_entry = read_catalog(f_catalog)
enable_entry_internal(list_catalog_entry, args.entry_number)
print_entry(list_catalog_entry)
write_catalog(f_new_catalog, list_catalog_entry)
f_catalog.close()
f_new_catalog.close()
def disable_entry(args):
f_catalog = open(args.catalog, "rb")
f_new_catalog = open(args.catalog + "_disable", "wb")
list_catalog_entry = read_catalog(f_catalog)
disable_entry_internal(list_catalog_entry, args.entry_number)
print_entry(list_catalog_entry)
write_catalog(f_new_catalog, list_catalog_entry)
f_catalog.close()
f_new_catalog.close()
def main():
parser = argparse.ArgumentParser(description="Manipulate VSS snapshot catalog file. This tool expects output of vss_carver.py.")
parser.add_argument('--version', action='version', version='%(prog)s {}'.format(__VERSION__))
subparsers = parser.add_subparsers(help='sub-command help', title='subcommands')
# parser.add_argument('--debug', action='store_true', default=False,
# help='debug mode if this flag is set (default: False)')
# list
parser_list = subparsers.add_parser('list', help='list -h')
parser_list.add_argument('catalog', action='store', type=str,
help='path to catalog file.')
parser_list.set_defaults(func=list_entry)
# move
parser_move = subparsers.add_parser('move', help='move -h. This manipulation will change several meta data (change shadow copy creation time, etc).')
parser_move.add_argument('catalog', action='store', type=str,
help='path to catalog file.')
parser_move.add_argument('entry_number', action='store', type=str,
help='list of entry numbers to move.')
parser_move.add_argument('destination', action='store', type=int,
help='entry number of destination.')
parser_move.set_defaults(func=move_entry)
# remove
parser_remove = subparsers.add_parser('remove', help='remove -h')
parser_remove.add_argument('catalog', action='store', type=str,
help='path to catalog file.')
parser_remove.add_argument('entry_number', action='store', type=str,
help='list of entry numbers to remove. ex) 2,3,5-8')
parser_remove.set_defaults(func=remove_entry)
# enable
parser_enable = subparsers.add_parser('enable', help='enable -h')
parser_enable.add_argument('catalog', action='store', type=str,
help='path to catalog file.')
parser_enable.add_argument('entry_number', action='store', type=str,
help='list of entry numbers to enable. ex) 2,3,5-8')
parser_enable.set_defaults(func=enable_entry)
# disable
parser_disable = subparsers.add_parser('disable', help='enable -h')
parser_disable.add_argument('catalog', action='store', type=str,
help='path to catalog file.')
parser_disable.add_argument('entry_number', action='store', type=str,
help='list of entry numbers to disable. ex) 2,3,5-8')
parser_disable.set_defaults(func=disable_entry)
# offset
# parser_disable = subparsers.add_parser('disable', help='enable -h')
# parser_disable.add_argument('catalog', action='store', type=str,
# help='path to catalog file.')
# parser_disable.add_argument('entry_number', action='store', type=str,
# help='list of entry numbers to disable. ex) 2,3,5-8')
# parser_disable.set_defaults(func=disable_entry)
args = parser.parse_args()
print('vss_carver {}'.format(__VERSION__))
if hasattr(args, 'func'):
args.func(args)
else:
parser.print_help()
if __name__ == "__main__":
main()