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