mirror of
https://github.com/volatilityfoundation/volatility3.git
synced 2026-10-01 14:04:54 +02:00
284 lines
13 KiB
Python
284 lines
13 KiB
Python
import logging
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import struct
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import typing
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from volatility.framework import interfaces, constants, validity
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from volatility.framework import symbols
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from volatility.framework.automagic import symbol_cache
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from volatility.framework.configuration import requirements
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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 MacSymbolFinder(interfaces.automagic.AutomagicInterface):
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"""Mac symbol loader based on uname signature strings"""
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priority = 40
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def __init__(self,
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context: interfaces.context.ContextInterface,
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config_path: str) -> None:
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super().__init__(context, config_path)
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self._requirements = [] # type: typing.List[typing.Tuple[str, interfaces.configuration.ConstructableRequirementInterface]]
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self._mac_banners_ = {} # type: mac_symbol_cache.MacBanners
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@property
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def _mac_banners(self) -> symbol_cache.BannersType:
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"""Creates a cached copy of the results, but only it's been requested"""
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if not self._mac_banners_:
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self._mac_banners_ = symbol_cache.MacSymbolCache.load_mac_banners()
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return self._mac_banners_
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def __call__(self,
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context: interfaces.context.ContextInterface,
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config_path: str,
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requirement: interfaces.configuration.RequirementInterface,
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progress_callback: validity.ProgressCallback = None) -> None:
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"""Searches for MacSymbolRequirements and attempt to populate them"""
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self._requirements = self.find_requirements(context, config_path, requirement,
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(requirements.TranslationLayerRequirement,
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requirements.SymbolRequirement),
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shortcut = False)
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for (sub_path, requirement) in self._requirements:
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parent_path = interfaces.configuration.parent_path(sub_path)
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if (isinstance(requirement, requirements.SymbolRequirement) and requirement.unsatisfied(context,
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parent_path)):
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for (tl_sub_path, tl_requirement) in self._requirements:
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tl_parent_path = interfaces.configuration.parent_path(tl_sub_path)
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# Find the TranslationLayer sibling to the SymbolRequirement
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if (isinstance(tl_requirement, requirements.TranslationLayerRequirement) and
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tl_parent_path == parent_path):
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if context.config.get(tl_sub_path, None):
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self._banner_scan(context, parent_path, requirement, context.config[tl_sub_path],
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progress_callback)
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break
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def _banner_scan(self,
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context: interfaces.context.ContextInterface,
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config_path: str,
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requirement: interfaces.configuration.ConstructableRequirementInterface,
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layer_name: str,
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progress_callback: validity.ProgressCallback = None) -> None:
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"""Accepts a context, config_path and SymbolRequirement, with a constructed layer_name
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and scans the layer for mac banners"""
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# Bomb out early if there's no banners
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if not self._mac_banners:
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return
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mss = scanners.MultiStringScanner([x for x in self._mac_banners if x is not None])
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layer = context.memory[layer_name]
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# Check if the Stacker has already found what we're looking for
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if layer.config.get('mac_banner', None):
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banner_list = [(0, bytes(layer.config['mac_banner'], 'latin-1'))] # type: typing.Iterable[typing.Any]
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else:
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# Swap to the physical layer for scanning
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# TODO: Fix this so it works for layers other than just Intel
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layer = context.memory[layer.config['memory_layer']]
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banner_list = layer.scan(context = context, scanner = mss, progress_callback = progress_callback)
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for _, banner in banner_list:
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vollog.debug("Identified banner: {}".format(repr(banner)))
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symbol_files = self._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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vollog.debug("Using symbol library: {}".format(symbol_files[0]))
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clazz = "volatility.framework.symbols.mac.MacKernelIntermedSymbols"
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# Set the discovered options
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path_join = interfaces.configuration.path_join
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context.config[path_join(config_path, requirement.name, "class")] = clazz
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context.config[path_join(config_path, requirement.name, "isf_url")] = isf_path
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# Construct the appropriate symbol table
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requirement.construct(context, config_path)
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break
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else:
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if symbol_files:
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vollog.debug("Symbol library path not found: {}".format(symbol_files[0]))
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# print("Kernel", banner, hex(banner_offset))
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else:
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vollog.debug("No existing mac banners found")
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# TODO: Fallback to generic regex search?
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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: validity.ProgressCallback = None) \
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-> typing.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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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 = symbol_cache.MacSymbolCache.load_mac_banners()
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mss = scanners.MultiStringScanner([x for x in mac_banners if x is not None])
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for banner_offset, banner in layer.scan(context = context, scanner = mss,
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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(context, 'temporary.' + table_name, 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(context, table_name, layer_name,
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banner, banner_offset, progress_callback = progress_callback)
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######################
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# ikelos: The following is what I tried to get the dtb, but couldn't figure out how to do
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# as you will see after the commented block of code is just a hardcoding of the DTB to my test sample's value
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#######################
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'''
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bootpml4_addr = 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 = interfaces.configuration.path_join("IntelHelper", new_layer_name)
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context.config[interfaces.configuration.path_join(config_path, "memory_layer")] = layer_name
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context.config[interfaces.configuration.path_join(config_path, "page_map_offset")] = bootpml4_addr
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layer = layers.intel.Intel32e(context, config_path = config_path,
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name = new_layer_name, metadata = {'os': 'Mac'})
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print("KEYS: {}".format("\n".join([k for k in layer.context.memory.keys()])))
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print("DIR: {}".format(dir(layer)))
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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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print("new dtb / idlepml4_addr = {:x".format(idlepml4_addr))
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sys.exit(1)
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'''
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dtb = 0x1ef6e000
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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("IntelHelper", 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, "mac_banner")] = str(banner, 'latin-1')
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layer = intel.Intel32e(context, config_path = config_path, name = new_layer_name)
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if layer and dtb:
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vollog.debug("DTB was found at: 0x{:0x}".format(dtb))
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return 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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config,
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context: interfaces.context.ContextInterface,
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aslr_shift = 0):
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if aslr_shift == 0:
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aslr_layer = config['primary.memory_layer']
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aslr_shift = MacUtilities.find_aslr(context, config["darwin"], aslr_layer)
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sym_table_name = config["darwin"]
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sym_layer_name = config["primary"]
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symbols.utility.mask_symbol_table(context.symbol_space[sym_table_name],
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context.memory[sym_layer_name].address_mask, aslr_shift)
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def _scan_generator(self, context, layer_name, progress_callback):
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darwin_signature = b"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(scanner = scanners.RegExScanner(darwin_signature),
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context = context, 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: validity.ProgressCallback = None) \
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-> typing.Tuple[int, 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_phys_offset = MacUtilities.virtual_to_physical_address(version_json_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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module = context.module(symbol_table, layer_name, 0)
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if compare_banner_offset == 0 or compare_banner == "":
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offset_generator = cls._scan_generator(cls, 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 - (version_json_address - 0xffffff8000000000)
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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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