mirror of
https://github.com/volatilityfoundation/volatility3.git
synced 2026-08-23 06:42:21 +02:00
207 lines
8.9 KiB
Python
207 lines
8.9 KiB
Python
# This file is Copyright 2019 Volatility Foundation and licensed under the Volatility Software License 1.0
|
|
# which is available at https://www.volatilityfoundation.org/license/vsl-v1.0
|
|
#
|
|
|
|
import logging
|
|
import struct
|
|
from typing import Optional
|
|
|
|
from volatility.framework import interfaces, constants, layers
|
|
from volatility.framework.automagic import symbol_cache, symbol_finder
|
|
from volatility.framework.layers import intel, scanners
|
|
from volatility.framework.symbols import mac
|
|
|
|
vollog = logging.getLogger(__name__)
|
|
|
|
|
|
class MacIntelStacker(interfaces.automagic.StackerLayerInterface):
|
|
stack_order = 45
|
|
exclusion_list = ['windows', 'linux']
|
|
|
|
@classmethod
|
|
def stack(cls,
|
|
context: interfaces.context.ContextInterface,
|
|
layer_name: str,
|
|
progress_callback: constants.ProgressCallback = None) -> Optional[interfaces.layers.DataLayerInterface]:
|
|
"""Attempts to identify mac within this layer."""
|
|
# Bail out by default unless we can stack properly
|
|
layer = context.layers[layer_name]
|
|
new_layer = None
|
|
join = interfaces.configuration.path_join
|
|
|
|
# Never stack on top of an intel layer
|
|
# FIXME: Find a way to improve this check
|
|
if isinstance(layer, intel.Intel):
|
|
return None
|
|
|
|
mac_banners = MacBannerCache.load_banners()
|
|
# If we have no banners, don't bother scanning
|
|
if not mac_banners:
|
|
vollog.info("No Mac banners found - if this is a mac plugin, please check your symbol files location")
|
|
return None
|
|
|
|
mss = scanners.MultiStringScanner([x for x in mac_banners if x])
|
|
for banner_offset, banner in layer.scan(context = context, scanner = mss,
|
|
progress_callback = progress_callback):
|
|
dtb = None
|
|
|
|
symbol_files = mac_banners.get(banner, None)
|
|
if symbol_files:
|
|
isf_path = symbol_files[0]
|
|
table_name = context.symbol_space.free_table_name('MacintelStacker')
|
|
table = mac.MacKernelIntermedSymbols(context = context,
|
|
config_path = join('temporary', table_name),
|
|
name = table_name,
|
|
isf_url = isf_path)
|
|
context.symbol_space.append(table)
|
|
kaslr_shift = cls.find_aslr(context = context,
|
|
symbol_table = table_name,
|
|
layer_name = layer_name,
|
|
compare_banner = banner,
|
|
compare_banner_offset = banner_offset,
|
|
progress_callback = progress_callback)
|
|
|
|
if kaslr_shift == 0:
|
|
vollog.log(constants.LOGLEVEL_VVV, "Invalid kalsr_shift found at offset: {}".format(banner_offset))
|
|
continue
|
|
|
|
bootpml4_addr = cls.virtual_to_physical_address(table.get_symbol("BootPML4").address + kaslr_shift)
|
|
|
|
new_layer_name = context.layers.free_layer_name("MacDTBTempLayer")
|
|
config_path = join("automagic", "MacIntelHelper", new_layer_name)
|
|
context.config[join(config_path, "memory_layer")] = layer_name
|
|
context.config[join(config_path, "page_map_offset")] = bootpml4_addr
|
|
|
|
layer = layers.intel.Intel32e(context,
|
|
config_path = config_path,
|
|
name = new_layer_name,
|
|
metadata = {'os': 'Mac'})
|
|
|
|
idlepml4_ptr = table.get_symbol("IdlePML4").address + kaslr_shift
|
|
idlepml4_str = layer.read(idlepml4_ptr, 4)
|
|
idlepml4_addr = struct.unpack("<I", idlepml4_str)[0]
|
|
|
|
tmp_dtb = idlepml4_addr
|
|
|
|
if tmp_dtb % 4096:
|
|
vollog.log(constants.LOGLEVEL_VVV, "Skipping non-page aligned DTB: 0x{:0x}".format(tmp_dtb))
|
|
continue
|
|
|
|
dtb = tmp_dtb
|
|
|
|
# Build the new layer
|
|
new_layer_name = context.layers.free_layer_name("IntelLayer")
|
|
config_path = join("automagic", "MacIntelHelper", new_layer_name)
|
|
context.config[join(config_path, "memory_layer")] = layer_name
|
|
context.config[join(config_path, "page_map_offset")] = dtb
|
|
context.config[join(config_path, MacSymbolFinder.banner_config_key)] = str(banner, 'latin-1')
|
|
|
|
new_layer = intel.Intel32e(context,
|
|
config_path = config_path,
|
|
name = new_layer_name,
|
|
metadata = {'kaslr_value': kaslr_shift})
|
|
|
|
if new_layer and dtb:
|
|
vollog.debug("Identified banner: {}".format(repr(banner)))
|
|
vollog.debug("DTB was found at: 0x{:0x}".format(dtb))
|
|
return new_layer
|
|
return None
|
|
|
|
@classmethod
|
|
def find_aslr(cls,
|
|
context: interfaces.context.ContextInterface,
|
|
symbol_table: str,
|
|
layer_name: str,
|
|
compare_banner: str = "",
|
|
compare_banner_offset: int = 0,
|
|
progress_callback: constants.ProgressCallback = None) -> int:
|
|
"""Determines the offset of the actual DTB in physical space and its
|
|
symbol offset."""
|
|
version_symbol = symbol_table + constants.BANG + 'version'
|
|
version_json_address = context.symbol_space.get_symbol(version_symbol).address
|
|
|
|
version_major_symbol = symbol_table + constants.BANG + 'version_major'
|
|
version_major_json_address = context.symbol_space.get_symbol(version_major_symbol).address
|
|
version_major_phys_offset = cls.virtual_to_physical_address(version_major_json_address)
|
|
|
|
version_minor_symbol = symbol_table + constants.BANG + 'version_minor'
|
|
version_minor_json_address = context.symbol_space.get_symbol(version_minor_symbol).address
|
|
version_minor_phys_offset = cls.virtual_to_physical_address(version_minor_json_address)
|
|
|
|
if not compare_banner_offset or not compare_banner:
|
|
offset_generator = cls._scan_generator(context, layer_name, progress_callback)
|
|
else:
|
|
offset_generator = [(compare_banner_offset, compare_banner)]
|
|
|
|
aslr_shift = 0
|
|
|
|
for offset, banner in offset_generator:
|
|
banner_major, banner_minor = [int(x) for x in banner[22:].split(b".")[0:2]]
|
|
|
|
tmp_aslr_shift = offset - cls.virtual_to_physical_address(version_json_address)
|
|
|
|
major_string = context.layers[layer_name].read(version_major_phys_offset + tmp_aslr_shift, 4)
|
|
major = struct.unpack("<I", major_string)[0]
|
|
|
|
if major != banner_major:
|
|
continue
|
|
|
|
minor_string = context.layers[layer_name].read(version_minor_phys_offset + tmp_aslr_shift, 4)
|
|
minor = struct.unpack("<I", minor_string)[0]
|
|
|
|
if minor != banner_minor:
|
|
continue
|
|
|
|
if tmp_aslr_shift & 0xfff != 0:
|
|
continue
|
|
|
|
aslr_shift = tmp_aslr_shift & 0xffffffff
|
|
break
|
|
|
|
vollog.log(constants.LOGLEVEL_VVVV, "Mac find_aslr returned: {:0x}".format(aslr_shift))
|
|
|
|
return aslr_shift
|
|
|
|
@classmethod
|
|
def virtual_to_physical_address(cls, addr: int) -> int:
|
|
"""Converts a virtual mac address to a physical one (does not account
|
|
of ASLR)"""
|
|
if addr > 0xffffff8000000000:
|
|
addr = addr - 0xffffff8000000000
|
|
else:
|
|
addr = addr - 0xff8000000000
|
|
|
|
return addr
|
|
|
|
@classmethod
|
|
def _scan_generator(cls, context, layer_name, progress_callback):
|
|
darwin_signature = rb"Darwin Kernel Version \d{1,3}\.\d{1,3}\.\d{1,3}: [^\x00]+\x00"
|
|
|
|
for offset in context.layers[layer_name].scan(scanner = scanners.RegExScanner(darwin_signature),
|
|
context = context,
|
|
progress_callback = progress_callback):
|
|
|
|
banner = context.layers[layer_name].read(offset, 128)
|
|
|
|
idx = banner.find(b"\x00")
|
|
if idx != -1:
|
|
banner = banner[:idx]
|
|
|
|
yield offset, banner
|
|
|
|
|
|
class MacBannerCache(symbol_cache.SymbolBannerCache):
|
|
"""Caches the banners found in the Mac symbol files."""
|
|
os = "mac"
|
|
symbol_name = "version"
|
|
banner_path = constants.MAC_BANNERS_PATH
|
|
|
|
|
|
class MacSymbolFinder(symbol_finder.SymbolFinder):
|
|
"""Mac symbol loader based on uname signature strings."""
|
|
|
|
banner_config_key = 'kernel_banner'
|
|
banner_cache = MacBannerCache
|
|
find_aslr = MacIntelStacker.find_aslr
|
|
symbol_class = "volatility.framework.symbols.mac.MacKernelIntermedSymbols"
|