mirror of
https://github.com/volatilityfoundation/volatility3.git
synced 2026-08-22 06:22:23 +02:00
Mike Auty
29d41470a4
Relented on the strict import of direct objects/classes for the typing module only. Typing module components can be directly imported because it makes the code really painful to read and write otherwise. This is still in-line with the python style guide adopted from Google at http://google.github.io/styleguide/pyguide.html section 2.2.
97 lines
4.1 KiB
Python
97 lines
4.1 KiB
Python
"""A module containing a collection of plugins that produce data
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typically found in Linux's /proc file system.
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"""
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import logging
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from typing import List
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from volatility.framework import exceptions, interfaces
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from volatility.framework import renderers
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from volatility.framework.automagic import linux
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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.renderers import format_hints
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vollog = logging.getLogger(__name__)
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class Check_afinfo(plugins.PluginInterface):
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"""Verifies the operation function pointers of network protocols"""
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@classmethod
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def get_requirements(cls) -> List[interfaces.configuration.RequirementInterface]:
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return [requirements.TranslationLayerRequirement(name = 'primary',
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description = 'Kernel Address Space',
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architectures = ["Intel32", "Intel64"]),
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requirements.SymbolRequirement(name = "vmlinux",
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description = "Linux Kernel")]
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# returns whether the symbol is found within the kernel (system.map) or not
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def _is_known_address(self, handler_addr):
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symbols = list(self.context.symbol_space.get_symbols_by_location(handler_addr))
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return len(symbols) > 0
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def _check_members(self, var_ops, var_name, members):
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for check in members:
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# redhat-specific garbage
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if check.startswith("__UNIQUE_ID_rh_kabi_hide"):
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continue
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if check == "write":
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addr = var_ops.member(attr = 'write')
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else:
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addr = getattr(var_ops, check)
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if addr and addr != 0 and not self._is_known_address(addr):
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yield check, addr
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def _check_afinfo(self, var_name, var, op_members, seq_members):
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for hooked_member, hook_address in self._check_members(var.seq_fops, var_name, op_members):
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yield var_name, hooked_member, hook_address
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# newer kernels
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if var.has_member("seq_ops"):
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for hooked_member, hook_address in self._check_members(var.seq_ops, var_name, seq_members):
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yield var_name, hooked_member, hook_address
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# this is the most commonly hooked member by rootkits, so a force a check on it
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elif not self._is_known_address(var.seq_show):
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yield var_name, "show", var.seq_show
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def _generator(self):
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_, aslr_shift = linux.LinuxUtilities.find_aslr(self.context, self.config['vmlinux'], self.config['primary'])
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vmlinux = self.context.module(self.config['vmlinux'], self.config['primary'], aslr_shift)
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linux.LinuxUtilities.aslr_mask_symbol_table(self.context,
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self.config['primary'],
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self.config['vmlinux'],
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aslr_shift)
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op_members = vmlinux.get_type('file_operations').members
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seq_members = vmlinux.get_type('seq_operations').members
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tcp = ("tcp_seq_afinfo", ["tcp6_seq_afinfo", "tcp4_seq_afinfo"])
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udp = ("udp_seq_afinfo", ["udplite6_seq_afinfo", "udp6_seq_afinfo", "udplite4_seq_afinfo", "udp4_seq_afinfo"])
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protocols = [tcp, udp]
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for (struct_type, global_vars) in protocols:
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for global_var_name in global_vars:
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# this will lookup fail for the IPv6 protocols on kernels without IPv6 support
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try:
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global_var = vmlinux.get_symbol(global_var_name)
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except exceptions.SymbolError:
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continue
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global_var = vmlinux.object(type_name = struct_type, offset = global_var.address)
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for name, member, address in self._check_afinfo(global_var_name, global_var, op_members, seq_members):
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yield 0, (name, member, format_hints.Hex(address))
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def run(self):
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return renderers.TreeGrid(
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[("Symbol Name", str),
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("Member", str),
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("Handler Address", format_hints.Hex)],
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self._generator())
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