mirror of
https://github.com/volatilityfoundation/volatility
synced 2026-06-08 18:04:46 +00:00
Andrew C
145 lines
5.5 KiB
Python
145 lines
5.5 KiB
Python
# Volatility
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# Copyright (C) 2007-2013 Volatility Foundation
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# Copyright (C) 2014 CrowdStrike, Inc.
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#
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# This file is part of Volatility.
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#
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# Volatility is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# Volatility is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Volatility. If not, see <http://www.gnu.org/licenses/>.
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#
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"""
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@author: Georg Wicherski
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@license: GNU General Public License 2.0
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@contact: georg@crowdstrike.com
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@organization: CrowdStrike, Inc.
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"""
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import volatility.obj as obj
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import volatility.plugins.linux.common as linux_common
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import volatility.plugins.linux.elfs as linux_elfs
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class linux_plthook(linux_elfs.linux_elfs):
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"""Scan ELF binaries' PLT for hooks to non-NEEDED images"""
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def __init__(self, config, *args, **kwargs):
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linux_elfs.linux_elfs.__init__(self, config, *args, **kwargs)
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self._config.add_option( \
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'ALL', short_option = 'a', default = False,
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help = 'Display all PLT slots (incl. not hooked)', action = 'store_true')
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self._config.add_option( \
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'IGNORE', default = [ ],
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help = 'Ignore mappings backed by this path, ' \
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+' useful for bad -l compiles (i.e. apache2 modules)',
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action = 'append')
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def calculate(self):
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linux_common.set_plugin_members(self)
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elfs = dict()
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ignore = frozenset(self._config.IGNORE)
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for task, elf, elf_start, elf_end, soname, needed in linux_elfs.linux_elfs.calculate(self):
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elfs[(task, soname)] = (elf, elf_start, elf_end, needed)
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for k, v in elfs.iteritems():
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task, soname = k
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elf, elf_start, elf_end, needed = v
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if elf._get_typename("hdr") == "elf32_hdr":
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elf_arch = 32
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else:
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elf_arch = 64
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needed_expanded = set([soname])
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if (task, None) in elfs:
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needed_expanded.add(None)
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# jmp slot can point to ELF itself if the fn hasn't been called yet (RTLD_LAZY)
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# can point to main binary (None above) if this is a plugin-style symbol
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while len(needed) > 0:
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dep = needed.pop(0)
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needed_expanded.add(dep)
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try:
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needed += set(elfs[(task, dep)][3]) - needed_expanded
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except KeyError:
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needed_expanded.remove(dep)
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for reloc in elf.relocations():
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rsym = elf.relocation_symbol(reloc)
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if rsym == None:
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continue
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symbol_name = elf.symbol_name(rsym)
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if symbol_name == None:
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symbol_name = "<N/A>"
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offset = reloc.r_offset
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if offset < elf_start:
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offset = elf_start + offset
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if elf_arch == 32:
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addr = obj.Object("unsigned int", offset = offset, vm = elf.obj_vm)
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else:
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addr = obj.Object("unsigned long long", offset = offset, vm = elf.obj_vm)
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match = False
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for dep in needed_expanded:
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_, dep_start, dep_end, _ = elfs[(task, dep)]
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if addr >= dep_start and addr < dep_end:
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match = dep
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hookdesc = ''
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vma = None
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for i in task.get_proc_maps():
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if addr >= i.vm_start and addr < i.vm_end:
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vma = i
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break
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if vma:
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if vma.vm_file:
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hookdesc = linux_common.get_path(task, vma.vm_file)
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if hookdesc in ignore:
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continue
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else:
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hookdesc = '[{0:x}:{1:x},{2}]'.format(vma.vm_start, vma.vm_end, vma.vm_flags)
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if hookdesc == "":
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hookdesc = 'invalid memory'
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if match != False:
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if self._config.ALL and match == soname:
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hookdesc = '[RTLD_LAZY]'
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hooked = False
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else:
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hooked = True
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yield task, soname, elf, elf_start, elf_end, addr, symbol_name, hookdesc, hooked
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def render_text(self, outfd, data):
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self.table_header(outfd, [("Task", "10"),
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("ELF Start", "[addrpad]"),
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("ELF Name", "24"),
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("Symbol", "24"),
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("Resolved Address", "[addrpad]"),
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("H", "1"),
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("Target Info", "")])
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for task, soname, elf, elf_start, elf_end, addr, imp, info, hooked in data:
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if not hooked and not self._config.ALL:
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continue
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self.table_row(outfd, task.pid, elf_start, soname if soname else '[main]', \
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imp, addr, '!' if hooked else ' ', info)
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