mirror of
https://github.com/volatilityfoundation/volatility3.git
synced 2026-08-23 14:42:25 +02:00
Mike Auty
c64ed6a8dd
This removes the assertions that checked plugin devs didn't do anything overly bad in favour of using mypy to ensure appropriate type-checking. It also moves the ProgressCallback typing information to constants in order to avoid circular imports (since constants doesn't import anything).
225 lines
9.6 KiB
Python
225 lines
9.6 KiB
Python
# This file was contributed to the Volatility Framework Version 3.
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# Copyright (C) 2018 Volatility Foundation.
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#
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# THE LICENSED WORK IS PROVIDED UNDER THE TERMS OF THE Volatility Contributors
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# Public License V1.0("LICENSE") AS FIRST COMPLETED BY: Volatility Foundation,
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# Inc. ANY USE, PUBLIC DISPLAY, PUBLIC PERFORMANCE, REPRODUCTION OR DISTRIBUTION
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# OF, OR PREPARATION OF SUBSEQUENT WORKS, DERIVATIVE WORKS OR DERIVED WORKS BASED
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# ON, THE LICENSED WORK CONSTITUTES RECIPIENT'S ACCEPTANCE OF THIS LICENSE AND ITS
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# TERMS, WHETHER OR NOT SUCH RECIPIENT READS THE TERMS OF THE LICENSE. "LICENSED
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# WORK,” “RECIPIENT" AND “DISTRIBUTOR" ARE DEFINED IN THE LICENSE. A COPY OF THE
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# LICENSE IS LOCATED IN THE TEXT FILE ENTITLED "LICENSE.txt" ACCOMPANYING THE
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# CONTENTS OF THIS FILE. IF A COPY OF THE LICENSE DOES NOT ACCOMPANY THIS FILE, A
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# COPY OF THE LICENSE MAY ALSO BE OBTAINED AT THE FOLLOWING WEB SITE:
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# https://www.volatilityfoundation.org/license/vcpl_v1.0
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#
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# Software distributed under the License is distributed on an "AS IS" basis,
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# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the
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# specific language governing rights and limitations under the License.
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#
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import logging
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import struct
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from typing import Optional
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from volatility.framework import interfaces, constants, layers
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from volatility.framework import symbols
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from volatility.framework.automagic import symbol_cache, symbol_finder
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from volatility.framework.layers import intel, scanners
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from volatility.framework.symbols import mac
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vollog = logging.getLogger(__name__)
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class MacBannerCache(symbol_cache.SymbolBannerCache):
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"""Caches the banners found in the Mac symbol files"""
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os = "mac"
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symbol_name = "version"
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banner_path = constants.MAC_BANNERS_PATH
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class MacSymbolFinder(symbol_finder.SymbolFinder):
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"""Mac symbol loader based on uname signature strings"""
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banner_config_key = 'kernel_banner'
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banner_cache = MacBannerCache
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symbol_class = "volatility.framework.symbols.mac.MacKernelIntermedSymbols"
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class MacintelStacker(interfaces.automagic.StackerLayerInterface):
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stack_order = 12
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@classmethod
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def stack(cls,
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context: interfaces.context.ContextInterface,
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layer_name: str,
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progress_callback: constants.ProgressCallback = None) -> Optional[interfaces.layers.DataLayerInterface]:
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"""Attempts to identify mac within this layer"""
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# Bail out by default unless we can stack properly
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layer = context.memory[layer_name]
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new_layer = None
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join = interfaces.configuration.path_join
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# Never stack on top of an intel layer
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# FIXME: Find a way to improve this check
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if isinstance(layer, intel.Intel):
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return None
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mac_banners = MacBannerCache.load_banners()
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# If we have no banners, don't bother scanning
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if not mac_banners:
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vollog.info("No Mac banners found - if this is a mac plugin, please check your symbol files location")
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return None
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mss = scanners.MultiStringScanner([x for x in mac_banners if x])
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for banner_offset, banner in layer.scan(
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context = context, scanner = mss, progress_callback = progress_callback):
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dtb = None
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vollog.debug("Identified banner: {}".format(repr(banner)))
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symbol_files = mac_banners.get(banner, None)
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if symbol_files:
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isf_path = symbol_files[0]
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table_name = context.symbol_space.free_table_name('MacintelStacker')
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table = mac.MacKernelIntermedSymbols(
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context = context,
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config_path = join('temporary', table_name),
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name = table_name,
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isf_url = isf_path)
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context.symbol_space.append(table)
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kaslr_shift = MacUtilities.find_aslr(
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context = context,
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symbol_table = table_name,
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layer_name = layer_name,
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compare_banner = banner,
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compare_banner_offset = banner_offset,
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progress_callback = progress_callback)
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bootpml4_addr = MacUtilities.virtual_to_physical_address(
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table.get_symbol("BootPML4").address + kaslr_shift)
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new_layer_name = context.memory.free_layer_name("MacDTBTempLayer")
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config_path = join("automagic", "MacIntelHelper", new_layer_name)
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context.config[join(config_path, "memory_layer")] = layer_name
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context.config[join(config_path, "page_map_offset")] = bootpml4_addr
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layer = layers.intel.Intel32e(
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context, config_path = config_path, name = new_layer_name, metadata = {'os': 'Mac'})
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idlepml4_ptr = table.get_symbol("IdlePML4").address + kaslr_shift
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idlepml4_str = layer.read(idlepml4_ptr, 4)
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idlepml4_addr = struct.unpack("<I", idlepml4_str)[0]
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dtb = idlepml4_addr
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# Build the new layer
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new_layer_name = context.memory.free_layer_name("IntelLayer")
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config_path = join("automagic", "MacIntelHelper", new_layer_name)
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context.config[join(config_path, "memory_layer")] = layer_name
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context.config[join(config_path, "page_map_offset")] = dtb
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context.config[join(config_path, MacSymbolFinder.banner_config_key)] = str(banner, 'latin-1')
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new_layer = intel.Intel32e(context, config_path = config_path, name = new_layer_name)
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if new_layer and dtb:
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vollog.debug("DTB was found at: 0x{:0x}".format(dtb))
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return new_layer
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return None
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class MacUtilities(object):
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"""Class with multiple useful mac functions"""
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@classmethod
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def aslr_mask_symbol_table(cls,
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context: interfaces.context.ContextInterface,
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symbol_table: str,
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layer_name: str,
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aslr_shift = 0):
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sym_table = context.symbol_space[symbol_table]
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sym_layer = context.memory[layer_name]
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if aslr_shift == 0:
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if not isinstance(sym_layer, layers.intel.Intel):
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raise TypeError("Layer name {} is not an intel space")
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aslr_layer = sym_layer.config['memory_layer']
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aslr_shift = cls.find_aslr(context, symbol_table, aslr_layer)
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symbols.mask_symbol_table(sym_table, sym_layer.address_mask, aslr_shift)
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@classmethod
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def _scan_generator(cls, context, layer_name, progress_callback):
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darwin_signature = rb"Darwin Kernel Version \d{1,3}\.\d{1,3}\.\d{1,3}: [^\x00]+\x00"
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for offset in context.memory[layer_name].scan(
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scanner = scanners.RegExScanner(darwin_signature), context = context,
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progress_callback = progress_callback):
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banner = context.memory[layer_name].read(offset, 128)
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idx = banner.find(b"\x00")
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if idx != -1:
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banner = banner[:idx]
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yield offset, banner
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@classmethod
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def find_aslr(cls,
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context: interfaces.context.ContextInterface,
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symbol_table: str,
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layer_name: str,
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compare_banner: str = "",
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compare_banner_offset: int = 0,
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progress_callback: constants.ProgressCallback = None) -> int:
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"""Determines the offset of the actual DTB in physical space and its symbol offset"""
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version_symbol = symbol_table + constants.BANG + 'version'
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version_json_address = context.symbol_space.get_symbol(version_symbol).address
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version_major_symbol = symbol_table + constants.BANG + 'version_major'
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version_major_json_address = context.symbol_space.get_symbol(version_major_symbol).address
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version_major_phys_offset = MacUtilities.virtual_to_physical_address(version_major_json_address)
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version_minor_symbol = symbol_table + constants.BANG + 'version_minor'
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version_minor_json_address = context.symbol_space.get_symbol(version_minor_symbol).address
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version_minor_phys_offset = MacUtilities.virtual_to_physical_address(version_minor_json_address)
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if not compare_banner_offset or not compare_banner:
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offset_generator = cls._scan_generator(context, layer_name, progress_callback)
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else:
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offset_generator = [(compare_banner_offset, compare_banner)]
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aslr_shift = 0
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for offset, banner in offset_generator:
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banner_major, banner_minor = [int(x) for x in banner[22:].split(b".")[0:2]]
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tmp_aslr_shift = offset - cls.virtual_to_physical_address(version_json_address)
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major_string = context.memory[layer_name].read(version_major_phys_offset + tmp_aslr_shift, 4)
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major = struct.unpack("<I", major_string)[0]
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if major != banner_major:
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continue
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minor_string = context.memory[layer_name].read(version_minor_phys_offset + tmp_aslr_shift, 4)
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minor = struct.unpack("<I", minor_string)[0]
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if minor != banner_minor:
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continue
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if aslr_shift & 0xfff != 0:
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continue
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aslr_shift = tmp_aslr_shift & 0xffffffff
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break
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vollog.debug("Mac ASLR shift value determined: {:0x}".format(aslr_shift))
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return aslr_shift
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@classmethod
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def virtual_to_physical_address(cls, addr: int) -> int:
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"""Converts a virtual mac address to a physical one (does not account of ASLR)"""
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return addr - 0xffffff8000000000
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