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106 lines
3.7 KiB
Python
106 lines
3.7 KiB
Python
# This file is Copyright 2020 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 List
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import volatility3.framework.symbols.linux.utilities.modules as linux_utilities_modules
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from volatility3.framework import interfaces, renderers, exceptions, constants
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from volatility3.framework.configuration import requirements
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from volatility3.framework.interfaces import plugins
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from volatility3.framework.objects import utility
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from volatility3.framework.renderers import format_hints
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from volatility3.framework.symbols import linux
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from volatility3.plugins.linux import lsmod
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vollog = logging.getLogger(__name__)
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class tty_check(plugins.PluginInterface):
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"""Checks tty devices for hooks"""
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_required_framework_version = (2, 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.ModuleRequirement(
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name="kernel",
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description="Linux kernel",
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architectures=["Intel32", "Intel64"],
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),
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requirements.VersionRequirement(
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name="linux_utilities_modules",
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component=linux_utilities_modules.Modules,
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version=(1, 0, 0),
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),
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requirements.PluginRequirement(
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name="lsmod", plugin=lsmod.Lsmod, version=(2, 0, 0)
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),
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requirements.VersionRequirement(
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name="linuxutils", component=linux.LinuxUtilities, version=(2, 0, 0)
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),
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]
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def _generator(self):
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vmlinux = self.context.modules[self.config["kernel"]]
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modules = lsmod.Lsmod.list_modules(self.context, vmlinux.name)
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handlers = linux.LinuxUtilities.generate_kernel_handler_info(
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self.context, vmlinux.name, modules
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)
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try:
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tty_drivers = vmlinux.object_from_symbol("tty_drivers").cast("list_head")
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except exceptions.SymbolError:
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tty_drivers = None
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if not tty_drivers:
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raise TypeError(
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"This plugin requires the tty_drivers structure."
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"This structure is not present in the supplied symbol table."
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"This means you are either analyzing an unsupported kernel version or that your symbol table is corrupt."
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)
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for tty in tty_drivers.to_list(
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vmlinux.symbol_table_name + constants.BANG + "tty_driver", "tty_drivers"
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):
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try:
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ttys = utility.array_of_pointers(
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tty.ttys.dereference(),
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count=tty.num,
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subtype=vmlinux.symbol_table_name + constants.BANG + "tty_struct",
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context=self.context,
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)
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except exceptions.PagedInvalidAddressException:
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continue
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for tty_dev in ttys:
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if tty_dev == 0:
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continue
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name = utility.array_to_string(tty_dev.name)
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recv_buf = tty_dev.ldisc.ops.receive_buf
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module_name, symbol_name = (
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linux_utilities_modules.Modules.lookup_module_address(
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self.context, vmlinux.name, handlers, recv_buf
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)
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)
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yield (0, (name, format_hints.Hex(recv_buf), module_name, symbol_name))
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def run(self):
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return renderers.TreeGrid(
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[
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("Name", str),
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("Address", format_hints.Hex),
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("Module", str),
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("Symbol", str),
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],
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self._generator(),
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)
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