mirror of
https://github.com/volatilityfoundation/volatility3.git
synced 2026-08-29 03:09:48 +02:00
Mike Auty
5362e2094e
Context.object accepts a template or a string name (and now a type flag). Module.object only accepts a string (because a template already has most of the stuff built in and might as well be passed to the Context.object constructor). The gotcha here is the absolute flag, which must now be set appropriately in all cases *except* where the module is constructed with an offset of 0 (whereby it will have no impact).
110 lines
5.0 KiB
Python
110 lines
5.0 KiB
Python
# This file was contributed to the Volatility Framework Version 3.
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# Copyright (C) 2018 Volatility Foundation.
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#
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# THE LICENSED WORK IS PROVIDED UNDER THE TERMS OF THE Volatility Contributors
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# Public License V1.0("LICENSE") AS FIRST COMPLETED BY: Volatility Foundation,
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# Inc. ANY USE, PUBLIC DISPLAY, PUBLIC PERFORMANCE, REPRODUCTION OR DISTRIBUTION
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# OF, OR PREPARATION OF SUBSEQUENT WORKS, DERIVATIVE WORKS OR DERIVED WORKS BASED
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# ON, THE LICENSED WORK CONSTITUTES RECIPIENT'S ACCEPTANCE OF THIS LICENSE AND ITS
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# TERMS, WHETHER OR NOT SUCH RECIPIENT READS THE TERMS OF THE LICENSE. "LICENSED
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# WORK,” “RECIPIENT" AND “DISTRIBUTOR" ARE DEFINED IN THE LICENSE. A COPY OF THE
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# LICENSE IS LOCATED IN THE TEXT FILE ENTITLED "LICENSE.txt" ACCOMPANYING THE
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# CONTENTS OF THIS FILE. IF A COPY OF THE LICENSE DOES NOT ACCOMPANY THIS FILE, A
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# COPY OF THE LICENSE MAY ALSO BE OBTAINED AT THE FOLLOWING WEB SITE:
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# https://www.volatilityfoundation.org/license/vcpl_v1.0
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#
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# Software distributed under the License is distributed on an "AS IS" basis,
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# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the
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# specific language governing rights and limitations under the License.
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#
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"""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, contexts
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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 [
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requirements.TranslationLayerRequirement(
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name = 'primary', description = 'Memory layer for the kernel', architectures = ["Intel32", "Intel64"]),
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requirements.SymbolTableRequirement(name = "vmlinux", description = "Linux kernel symbols")
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]
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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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linux.LinuxUtilities.aslr_mask_symbol_table(self.context, self.config['vmlinux'], self.config['primary'])
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vmlinux = contexts.Module(
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self.context, self.config['vmlinux'], self.config['primary'], 0, absolute_symbol_addresses = True)
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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(symbol = 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([("Symbol Name", str), ("Member", str), ("Handler Address", format_hints.Hex)],
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self._generator())
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