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241 lines
12 KiB
Python
241 lines
12 KiB
Python
# This file is Copyright 2019 Volatility Foundation and licensed under the Volatility Software License 1.0
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# which is available at https://www.volatilityfoundation.org/license/vsl-v1.0
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#
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import logging
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from typing import Iterator, List, Tuple, Iterable, Optional
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from volatility.framework import renderers, interfaces, exceptions
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from volatility.framework.configuration import requirements
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from volatility.framework.interfaces import plugins
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from volatility.framework.layers import registry
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from volatility.framework.renderers import format_hints
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from volatility.plugins.windows.registry import hivescan
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vollog = logging.getLogger(__name__)
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class HiveGenerator:
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"""Walks the registry HiveList linked list in a given direction and stores an invalid offset
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if it's unable to fully walk the list"""
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def __init__(self, cmhive, forward = True):
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self._cmhive = cmhive
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self._forward = forward
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self._invalid = None
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def __iter__(self):
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for hive in self._cmhive.HiveList.to_list(self._cmhive.vol.type_name, "HiveList", forward = self._forward):
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if not hive.is_valid():
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self._invalid = hive.vol.offset
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return
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yield hive
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@property
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def invalid(self) -> Optional[int]:
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return self._invalid
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class HiveList(interfaces.plugins.PluginInterface):
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"""Lists the registry hives present in a particular memory image."""
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_version = (1, 0, 0)
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@classmethod
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def get_requirements(cls) -> List[interfaces.configuration.RequirementInterface]:
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return [
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requirements.TranslationLayerRequirement(name = 'primary',
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description = 'Memory layer for the kernel',
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architectures = ["Intel32", "Intel64"]),
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requirements.SymbolTableRequirement(name = "nt_symbols", description = "Windows kernel symbols"),
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requirements.StringRequirement(name = 'filter',
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description = "String to filter hive names returned",
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optional = True,
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default = None),
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requirements.PluginRequirement(name = 'hivescan', plugin = hivescan.HiveScan, version = (1, 0, 0)),
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requirements.BooleanRequirement(name = 'dump',
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description = "Extract listed registry hives",
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default = False,
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optional = True)
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]
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def _sanitize_hive_name(self, name: str) -> str:
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return name.split('\\')[-1].replace(' ', '_').replace('.', '').replace('[', '').replace(']', '')
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def _generator(self) -> Iterator[Tuple[int, Tuple[int, str]]]:
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chunk_size = 0x500000
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for hive_object in self.list_hive_objects(context = self.context,
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layer_name = self.config["primary"],
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symbol_table = self.config["nt_symbols"],
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filter_string = self.config.get('filter', None)):
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dumped = False
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if self.config['dump']:
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# Construct the hive
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hive = next(
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self.list_hives(self.context,
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self.config_path,
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layer_name = self.config["primary"],
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symbol_table = self.config["nt_symbols"],
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hive_offsets = [hive_object.vol.offset]))
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maxaddr = hive.hive.Storage[0].Length
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hive_name = self._sanitize_hive_name(hive.get_name())
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filedata = plugins.FileInterface('registry.{}.{}.hive'.format(hive_name, hex(hive.hive_offset)))
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if hive._base_block:
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hive_data = self.context.layers[hive.dependencies[0]].read(hive.hive.BaseBlock, 1 << 12)
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else:
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hive_data = '\x00' * (1 << 12)
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filedata.data.write(hive_data)
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for i in range(0, maxaddr, chunk_size):
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current_chunk_size = min(chunk_size, maxaddr - i)
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data = hive.read(i, current_chunk_size, pad = True)
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filedata.data.write(data)
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# if self._progress_callback:
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# self._progress_callback((i / maxaddr) * 100, 'Writing layer {}'.format(hive_name))
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self.produce_file(filedata)
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dumped = True
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yield (0, (format_hints.Hex(hive_object.vol.offset), hive_object.get_name() or "", dumped))
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@classmethod
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def list_hives(cls,
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context: interfaces.context.ContextInterface,
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base_config_path: str,
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layer_name: str,
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symbol_table: str,
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filter_string: Optional[str] = None,
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hive_offsets: List[int] = None) -> Iterable[registry.RegistryHive]:
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"""Walks through a registry, hive by hive returning the constructed
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registry layer name.
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Args:
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context: The context to retrieve required elements (layers, symbol tables) from
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base_config_path: The configuration path for any settings required by the new table
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layer_name: The name of the layer on which to operate
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symbol_table: The name of the table containing the kernel symbols
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filter_string: An optional string which must be present in the hive name if specified
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offset: An optional offset to specify a specific hive to iterate over (takes precedence over filter_string)
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Yields:
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A registry hive layer name
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"""
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if hive_offsets is None:
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try:
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hive_offsets = [
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hive.vol.offset for hive in cls.list_hive_objects(context, layer_name, symbol_table, filter_string)
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]
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except ImportError:
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vollog.warning("Unable to import windows.hivelist plugin, please provide a hive offset")
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raise ValueError("Unable to import windows.hivelist plugin, please provide a hive offset")
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for hive_offset in hive_offsets:
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# Construct the hive
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reg_config_path = cls.make_subconfig(context = context,
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base_config_path = base_config_path,
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hive_offset = hive_offset,
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base_layer = layer_name,
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nt_symbols = symbol_table)
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try:
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hive = registry.RegistryHive(context, reg_config_path, name = 'hive' + hex(hive_offset))
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except exceptions.InvalidAddressException:
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vollog.warning("Couldn't create RegistryHive layer at offset {}, skipping".format(hex(hive_offset)))
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continue
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context.layers.add_layer(hive)
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yield hive
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@classmethod
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def list_hive_objects(cls,
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context: interfaces.context.ContextInterface,
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layer_name: str,
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symbol_table: str,
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filter_string: str = None) -> Iterator[interfaces.objects.ObjectInterface]:
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"""Lists all the hives in the primary layer.
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Args:
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context: The context to retrieve required elements (layers, symbol tables) from
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layer_name: The name of the layer on which to operate
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symbol_table: The name of the table containing the kernel symbols
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filter_string: A string which must be present in the hive name if specified
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Returns:
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The list of registry hives from the `layer_name` layer as filtered against using the `filter_string`
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"""
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# We only use the object factory to demonstrate how to use one
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kvo = context.layers[layer_name].config['kernel_virtual_offset']
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ntkrnlmp = context.module(symbol_table, layer_name = layer_name, offset = kvo)
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list_head = ntkrnlmp.get_symbol("CmpHiveListHead").address
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list_entry = ntkrnlmp.object(object_type = "_LIST_ENTRY", offset = list_head)
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reloff = ntkrnlmp.get_type("_CMHIVE").relative_child_offset("HiveList")
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cmhive = ntkrnlmp.object(object_type = "_CMHIVE", offset = list_entry.vol.offset - reloff, absolute = True)
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# Run through the list forwards
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seen = set()
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hg = HiveGenerator(cmhive, forward = True)
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for hive in hg:
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if hive.vol.offset in seen:
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vollog.debug("Hivelist found an already seen offset {} while " \
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"traversing forwards, this should not occur".format(hex(hive.vol.offset)))
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break
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seen.add(hive.vol.offset)
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if filter_string is None or filter_string.lower() in str(hive.get_name() or "").lower():
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if context.layers[layer_name].is_valid(hive.vol.offset):
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yield hive
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forward_invalid = hg.invalid
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if forward_invalid:
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vollog.debug("Hivelist failed traversing the list forwards at {}, traversing backwards".format(
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hex(forward_invalid)))
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hg = HiveGenerator(cmhive, forward = False)
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for hive in hg:
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if hive.vol.offset in seen:
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vollog.debug("Hivelist found an already seen offset {} while " \
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"traversing backwards, list walking met in the middle".format(hex(hive.vol.offset)))
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break
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seen.add(hive.vol.offset)
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if filter_string is None or filter_string.lower() in str(hive.get_name() or "").lower():
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if context.layers[layer_name].is_valid(hive.vol.offset):
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yield hive
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backward_invalid = hg.invalid
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if backward_invalid and forward_invalid != backward_invalid:
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# walking forward and backward did not stop at the same offset. they should if:
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# 1) there are no invalid hives, walking forwards would reach the end and backwards is not necessary
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# 2) there is one invalid hive, walking backwards would stop at the same place as forwards
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# therefore, there must be more 2 or more invalid hives, so the middle of the list is not reachable
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# by walking the list, so revert to scanning, and walk the list forwards and backwards from each
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# found hive
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vollog.debug("Hivelist failed traversing backwards at {}, a different " \
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"location from forwards, revert to scanning".format(hex(backward_invalid)))
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for hive in hivescan.HiveScan.scan_hives(context, layer_name, symbol_table):
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try:
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if hive.HiveList.Flink:
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start_hive_offset = hive.HiveList.Flink - reloff
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## Now instantiate the first hive in virtual address space as normal
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start_hive = ntkrnlmp.object(object_type = "_CMHIVE",
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offset = start_hive_offset,
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absolute = True)
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for forward in (True, False):
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for linked_hive in start_hive.HiveList.to_list(hive.vol.type_name, "HiveList", forward):
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if not linked_hive.is_valid() or linked_hive.vol.offset in seen:
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continue
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seen.add(linked_hive.vol.offset)
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if filter_string is None or filter_string.lower() in str(linked_hive.get_name()
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or "").lower():
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if context.layers[layer_name].is_valid(linked_hive.vol.offset):
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yield linked_hive
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except exceptions.InvalidAddressException:
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vollog.debug("InvalidAddressException when traversing hive {} found from scan, skipping".format(
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hex(hive.vol.offset)))
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def run(self) -> renderers.TreeGrid:
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return renderers.TreeGrid([("Offset", format_hints.Hex), ("FileFullPath", str), ("Dumped", bool)],
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self._generator())
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