/usr/lib/python2.7/dist-packages/rekall/plugins/response/registry.py is in python-rekall-core 1.6.0+dfsg-2.
This file is owned by root:root, with mode 0o644.
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This code is borrowed from GRR.
"""
import ctypes
import ctypes.wintypes
import exceptions
import stat
import StringIO
import _winreg
from rekall import obj
from rekall import utils
from rekall.plugins.overlays import basic
from rekall.plugins.response import common
# Difference between 1 Jan 1601 and 1 Jan 1970.
WIN_UNIX_DIFF_MSECS = 11644473600
# KEY_READ = STANDARD_RIGHTS_READ | KEY_QUERY_VALUE |
# KEY_ENUMERATE_SUB_KEYS | KEY_NOTIFY
# Also see: http://msdn.microsoft.com/en-us/library/windows/desktop/
# ms724878(v=vs.85).aspx
KEY_READ = 0x20019
# _winreg is broken on Python 2.x and doesn't support unicode registry values.
# We provide some replacement functions here.
advapi32 = ctypes.windll.advapi32
LPDWORD = ctypes.POINTER(ctypes.wintypes.DWORD)
LPBYTE = ctypes.POINTER(ctypes.wintypes.BYTE)
ERROR_SUCCESS = 0
ERROR_MORE_DATA = 234
class FileTime(ctypes.Structure):
_fields_ = [("dwLowDateTime", ctypes.wintypes.DWORD),
("dwHighDateTime", ctypes.wintypes.DWORD)]
RegCloseKey = advapi32.RegCloseKey
RegCloseKey.restype = ctypes.c_long
RegCloseKey.argtypes = [ctypes.c_void_p]
RegEnumKeyEx = advapi32.RegEnumKeyExW
RegEnumKeyEx.restype = ctypes.c_long
RegEnumKeyEx.argtypes = [ctypes.c_void_p, ctypes.wintypes.DWORD,
ctypes.c_wchar_p, LPDWORD, LPDWORD, ctypes.c_wchar_p,
LPDWORD, ctypes.POINTER(FileTime)]
RegEnumValue = advapi32.RegEnumValueW
RegEnumValue.restype = ctypes.c_long
RegEnumValue.argtypes = [ctypes.c_void_p, ctypes.wintypes.DWORD,
ctypes.c_wchar_p, LPDWORD, LPDWORD, LPDWORD, LPBYTE,
LPDWORD]
RegOpenKeyEx = advapi32.RegOpenKeyExW
RegOpenKeyEx.restype = ctypes.c_long
RegOpenKeyEx.argtypes = [ctypes.c_void_p, ctypes.c_wchar_p, ctypes.c_ulong,
ctypes.c_ulong, ctypes.POINTER(ctypes.c_void_p)]
RegQueryInfoKey = advapi32.RegQueryInfoKeyW
RegQueryInfoKey.restype = ctypes.c_long
RegQueryInfoKey.argtypes = [ctypes.c_void_p, ctypes.c_wchar_p, LPDWORD, LPDWORD,
LPDWORD, LPDWORD, LPDWORD, LPDWORD, LPDWORD,
LPDWORD, LPDWORD, ctypes.POINTER(FileTime)]
RegQueryValueEx = advapi32.RegQueryValueExW
RegQueryValueEx.restype = ctypes.c_long
RegQueryValueEx.argtypes = [ctypes.c_void_p, ctypes.c_wchar_p, LPDWORD, LPDWORD,
LPBYTE, LPDWORD]
class KeyHandle(object):
"""A wrapper class for a registry key handle."""
def __init__(self, value=0, close=True):
if value:
self.handle = ctypes.c_void_p(value)
else:
self.handle = ctypes.c_void_p()
self._close = close
def __enter__(self):
return self
def __exit__(self, exc_type=None, exc_val=None, exc_tb=None):
self.Close()
return False
def Close(self):
if not self.handle or not self._close:
return
if RegCloseKey is None:
return # Globals become None during exit.
rc = RegCloseKey(self.handle)
self.handle = ctypes.c_void_p()
if rc != ERROR_SUCCESS:
raise ctypes.WinError(2)
def __del__(self):
self.Close()
def OpenKey(key, sub_key):
"""This calls the Windows OpenKeyEx function in a Unicode safe way."""
if not sub_key:
result = KeyHandle(close=False)
result.handle = key.handle
return result
new_key = KeyHandle()
# Don't use KEY_WOW64_64KEY (0x100) since it breaks on Windows 2000
rc = RegOpenKeyEx(key.handle, sub_key, 0, KEY_READ, ctypes.cast(
ctypes.byref(new_key.handle), ctypes.POINTER(ctypes.c_void_p)))
if rc != ERROR_SUCCESS:
raise ctypes.WinError(2)
return new_key
def CloseKey(key):
rc = RegCloseKey(key)
if rc != ERROR_SUCCESS:
raise ctypes.WinError(2)
def QueryInfoKey(key):
"""This calls the Windows RegQueryInfoKey function in a Unicode safe way."""
null = LPDWORD()
num_sub_keys = ctypes.wintypes.DWORD()
num_values = ctypes.wintypes.DWORD()
ft = FileTime()
rc = RegQueryInfoKey(key.handle, ctypes.c_wchar_p(), null, null,
ctypes.byref(num_sub_keys), null, null,
ctypes.byref(num_values), null, null, null,
ctypes.byref(ft))
if rc != ERROR_SUCCESS:
raise ctypes.WinError(2)
return (num_sub_keys.value, num_values.value, ft.dwLowDateTime
| (ft.dwHighDateTime << 32))
def QueryValueEx(key, value_name):
"""This calls the Windows QueryValueEx function in a Unicode safe way."""
size = 256
data_type = ctypes.wintypes.DWORD()
while True:
tmp_size = ctypes.wintypes.DWORD(size)
buf = ctypes.create_string_buffer(size)
rc = RegQueryValueEx(key.handle, value_name, LPDWORD(),
ctypes.byref(data_type), ctypes.cast(buf, LPBYTE),
ctypes.byref(tmp_size))
if rc != ERROR_MORE_DATA:
break
# We limit the size here to ~10 MB so the response doesn't get too big.
if size > 10 * 1024 * 1024:
raise exceptions.WindowsError("Value too big to be read.")
size *= 2
if rc != ERROR_SUCCESS:
raise ctypes.WinError(2)
return (Reg2Py(buf, tmp_size.value, data_type.value), data_type.value)
def EnumKey(key, index):
"""This calls the Windows RegEnumKeyEx function in a Unicode safe way."""
buf = ctypes.create_unicode_buffer(257)
length = ctypes.wintypes.DWORD(257)
rc = RegEnumKeyEx(key.handle, index, ctypes.cast(buf, ctypes.c_wchar_p),
ctypes.byref(length), LPDWORD(), ctypes.c_wchar_p(),
LPDWORD(), ctypes.POINTER(FileTime)())
if rc != 0:
raise ctypes.WinError(2)
return ctypes.wstring_at(buf, length.value).rstrip(u"\x00")
def EnumValue(key, index):
"""This calls the Windows RegEnumValue function in a Unicode safe way."""
null = ctypes.POINTER(ctypes.wintypes.DWORD)()
value_size = ctypes.wintypes.DWORD()
data_size = ctypes.wintypes.DWORD()
rc = RegQueryInfoKey(key.handle, ctypes.c_wchar_p(), null, null, null, null,
null, null, ctypes.byref(value_size),
ctypes.byref(data_size), null,
ctypes.POINTER(FileTime)())
if rc != ERROR_SUCCESS:
raise ctypes.WinError(2)
value_size.value += 1
data_size.value += 1
value = ctypes.create_unicode_buffer(value_size.value)
while True:
data = ctypes.create_string_buffer(data_size.value)
tmp_value_size = ctypes.wintypes.DWORD(value_size.value)
tmp_data_size = ctypes.wintypes.DWORD(data_size.value)
data_type = ctypes.wintypes.DWORD()
rc = RegEnumValue(key.handle, index, ctypes.cast(
value, ctypes.c_wchar_p),
ctypes.byref(tmp_value_size), null,
ctypes.byref(data_type), ctypes.cast(data, LPBYTE),
ctypes.byref(tmp_data_size))
if rc != ERROR_MORE_DATA:
break
data_size.value *= 2
if rc != ERROR_SUCCESS:
raise ctypes.WinError(2)
return (value.value, Reg2Py(data, tmp_data_size.value, data_type.value),
data_type.value)
def Reg2Py(data, size, data_type):
if data_type == _winreg.REG_DWORD:
if size == 0:
return 0
return ctypes.cast(data, ctypes.POINTER(ctypes.c_int)).contents.value
elif data_type == _winreg.REG_SZ or data_type == _winreg.REG_EXPAND_SZ:
return ctypes.wstring_at(data, size // 2).rstrip(u"\x00")
elif data_type == _winreg.REG_MULTI_SZ:
return ctypes.wstring_at(data, size // 2).rstrip(u"\x00").split(u"\x00")
else:
if size == 0:
return None
return ctypes.string_at(data, size)
class RegistryKeyInformation(common.FileInformation):
"""Represent a key or value."""
_hive_handle = None
# Maps the registry types to names
registry_map = {
_winreg.REG_NONE: "REG_NONE",
_winreg.REG_SZ: "REG_SZ",
_winreg.REG_EXPAND_SZ: "REG_EXPAND_SZ",
_winreg.REG_BINARY: "REG_BINARY",
_winreg.REG_DWORD: "REG_DWORD",
_winreg.REG_DWORD_LITTLE_ENDIAN: "REG_DWORD_LITTLE_ENDIAN",
_winreg.REG_DWORD_BIG_ENDIAN: "REG_DWORD_BIG_ENDIAN",
_winreg.REG_LINK: "REG_LINK",
_winreg.REG_MULTI_SZ: "REG_MULTI_SZ",
}
def __init__(self, filename=None, **kwargs):
filename = common.FileSpec(filename, filesystem="Reg", path_sep="\\")
super(RegistryKeyInformation, self).__init__(
filename=filename, **kwargs)
self.hive = self.key_name = self.value_name = self.value = ""
self.value_type = "REG_NONE"
self.st_mode = stat.S_IFDIR
path_components = self.filename.components()
if not path_components:
return
# The first component MUST be a hive
self.hive = path_components[0]
self._hive_handle = KeyHandle(getattr(_winreg, self.hive, None))
if self._hive_handle is None:
raise IOError("Unknown hive name %s" % self.hive)
# Maybe its a key.
try:
self._read_key(path_components)
except exceptions.WindowsError:
# Nop - maybe its a value then.
self._read_value(path_components)
def _read_value(self, path_components):
self.key_name = "\\".join(path_components[1:-1])
self.value_name = path_components[-1]
with OpenKey(self._hive_handle, self.key_name) as key:
# We are a value - we can be read but we can not be listed.
self.value, value_type = QueryValueEx(key, self.value_name)
self.st_mode = stat.S_IFREG
self.value_type = self.registry_map[value_type]
self.st_size = len(utils.SmartStr(self.value))
def _read_key(self, path_components):
# The path is just the hive name.
if len(path_components) == 1:
return
# Its probably a key
self.key_name = "\\".join(path_components[1:])
self.value_name = ""
# Try to get the default value for this key
with OpenKey(self._hive_handle, self.key_name) as key:
# Check for default value.
try:
self.value, value_type = QueryValueEx(key, self.value_name)
self.value_type = self.registry_map[value_type]
self.st_size = len(utils.SmartStr(self.value))
except exceptions.WindowsError:
pass
@classmethod
def from_stat(cls, filespec, session=None):
return RegistryKeyInformation(filename=filespec, session=session)
def open(self):
if self.value_type != "REG_NONE":
return StringIO.StringIO(self.value)
return obj.NoneObject("No data")
def list(self):
if self.st_mode == stat.S_IFREG:
return
# We represent the virtual root of all hives.
if self._hive_handle is None:
for name in dir(_winreg):
if name.startswith("HKEY_"):
yield RegistryKeyInformation(
filename=name, session=self.session)
return
try:
with OpenKey(self._hive_handle, self.key_name) as key:
(number_of_keys,
number_of_values,
last_modified) = QueryInfoKey(key)
st_mtime = basic.UnixTimeStamp(
name="st_mtime", value=(
last_modified / 10000000 - WIN_UNIX_DIFF_MSECS),
session=self.session)
# First keys - These will look like directories.
for i in xrange(number_of_keys):
name = EnumKey(key, i)
key_name = "\\".join((self.hive, self.key_name, name))
try:
subkey = RegistryKeyInformation(
filename=key_name, session=self.session)
subkey.st_mtime = st_mtime
yield subkey
except exceptions.WindowsError:
pass
# Now Values - These will look like files.
for i in xrange(number_of_values):
name, _, _ = EnumValue(key, i)
key_name = "\\".join((self.hive, self.key_name, name))
try:
subkey = RegistryKeyInformation(
filename=key_name, session=self.session)
subkey.st_mtime = st_mtime
yield subkey
except exceptions.WindowsError:
pass
except exceptions.WindowsError as e:
raise IOError("Unable to list key %s: %s" % (
self.key_name, e))
# Register Reg as a filesystem:
common.FILE_SPEC_DISPATCHER["Reg"] = RegistryKeyInformation
|