/usr/lib/python2.7/dist-packages/volatility/plugins/addrspaces/hibernate.py is in volatility 2.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 2008-2013 Volatility Foundation
# Copyright (c) 2008 Brendan Dolan-Gavitt <bdolangavitt@wesleyan.edu>
#
# This file is part of Volatility.
#
# Volatility is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# Volatility is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Volatility. If not, see <http://www.gnu.org/licenses/>.
#
# Code found in WindowsHiberFileSpace32 for parsing meta information
# is inspired by the work of Matthieu Suiche: http://sandman.msuiche.net/.
# A special thanks to Matthieu for all his help integrating
# this code in Volatility.
""" A Hiber file Address Space """
import volatility.addrspace as addrspace
import volatility.obj as obj
import volatility.win32.xpress as xpress
import struct
#pylint: disable-msg=C0111
PAGE_SIZE = 0x1000
page_shift = 12
class Store(object):
def __init__(self, limit = 50):
self.limit = limit
self.cache = {}
self.seq = []
self.size = 0
def put(self, key, item):
self.cache[key] = item
self.size += len(item)
self.seq.append(key)
if len(self.seq) >= self.limit:
key = self.seq.pop(0)
self.size -= len(self.cache[key])
del self.cache[key]
def get(self, key):
return self.cache[key]
class WindowsHiberFileSpace32(addrspace.BaseAddressSpace):
""" This is a hibernate address space for windows hibernation files.
In order for us to work we need to:
1) have a valid baseAddressSpace
2) the first 4 bytes must be 'hibr' or 'wake'
otherwise we bruteforce to find self.header.FirstTablePage in
_get_first_table_page() this occurs with a zeroed PO_MEMORY_IMAGE header
"""
order = 10
def __init__(self, base, config, **kwargs):
self.as_assert(base, "No base Address Space")
addrspace.BaseAddressSpace.__init__(self, base, config, **kwargs)
self.runs = []
self.PageDict = {}
self.HighestPage = 0
self.PageIndex = 0
self.AddressList = []
self.LookupCache = {}
self.PageCache = Store(50)
self.MemRangeCnt = 0
self.entry_count = 0xFF
self._long_struct = struct.Struct("=I")
# Extract header information
self.as_assert(self.profile.has_type("PO_MEMORY_IMAGE"), "PO_MEMORY_IMAGE is not available in profile")
self.header = obj.Object('PO_MEMORY_IMAGE', 0, base)
## Is the signature right?
if self.header.Signature.lower() not in ['hibr', 'wake']:
self.header = obj.NoneObject("Invalid hibernation header")
volmag = obj.VolMagic(base)
self.entry_count = volmag.HibrEntryCount.v()
PROC_PAGE = volmag.HibrProcPage.v()
# Check it's definitely a hibernation file
pageno = self._get_first_table_page()
self.as_assert(pageno is not None, "No xpress signature found")
self.as_assert(pageno <= 10, "Bad profile for PO_MEMORY_RANGE")
# Extract processor state
self.ProcState = obj.Object("_KPROCESSOR_STATE", PROC_PAGE * 4096, base)
## This is a pointer to the page table - any ASs above us dont
## need to search for it.
self.dtb = self.ProcState.SpecialRegisters.Cr3.v()
# This is a lengthy process, it was cached, but it may be best to delay this
# until it's absolutely necessary and/or convert it into a generator...
self.build_page_cache()
def _get_first_table_page(self):
if self.header != None:
return self.header.FirstTablePage
for i in range(10):
if self.base.read(i * PAGE_SIZE, 8) == "\x81\x81xpress":
return i - 1
return None
def build_page_cache(self):
XpressIndex = 0
XpressHeader = obj.Object("_IMAGE_XPRESS_HEADER",
(self._get_first_table_page() + 1) * 4096,
self.base)
XpressBlockSize = self.get_xpress_block_size(XpressHeader)
MemoryArrayOffset = self._get_first_table_page() * 4096
while MemoryArrayOffset:
MemoryArray = obj.Object('_PO_MEMORY_RANGE_ARRAY', MemoryArrayOffset, self.base)
EntryCount = MemoryArray.MemArrayLink.EntryCount.v()
for i in MemoryArray.RangeTable:
start = i.StartPage.v()
end = i.EndPage.v()
LocalPageCnt = end - start
self.as_assert((LocalPageCnt > 0), "Negative Page Count Range")
if end > self.HighestPage:
self.HighestPage = end
self.AddressList.append((start * 0x1000, LocalPageCnt * 0x1000))
for j in range(0, LocalPageCnt):
if (XpressIndex and ((XpressIndex % 0x10) == 0)):
XpressHeader, XpressBlockSize = \
self.next_xpress(XpressHeader, XpressBlockSize)
PageNumber = start + j
XpressPage = XpressIndex % 0x10
if XpressHeader.obj_offset not in self.PageDict:
self.PageDict[XpressHeader.obj_offset] = [
(PageNumber, XpressBlockSize, XpressPage)]
else:
self.PageDict[XpressHeader.obj_offset].append(
(PageNumber, XpressBlockSize, XpressPage))
## Update the lookup cache
self.LookupCache[PageNumber] = (
XpressHeader.obj_offset, XpressBlockSize, XpressPage)
self.PageIndex += 1
XpressIndex += 1
NextTable = MemoryArray.MemArrayLink.NextTable.v()
# This entry count (EntryCount) should probably be calculated
if (NextTable and (EntryCount == self.entry_count)):
MemoryArrayOffset = NextTable * 0x1000
self.MemRangeCnt += 1
XpressHeader, XpressBlockSize = \
self.next_xpress(XpressHeader, XpressBlockSize)
# Make sure the xpress block is after the Memory Table
while (XpressHeader.obj_offset < MemoryArrayOffset):
XpressHeader, XpressBlockSize = \
self.next_xpress(XpressHeader, 0)
XpressIndex = 0
else:
MemoryArrayOffset = 0
def next_xpress(self, XpressHeader, XpressBlockSize):
XpressHeaderOffset = XpressBlockSize + XpressHeader.obj_offset + \
XpressHeader.size()
## We only search this far
BLOCKSIZE = 1024
original_offset = XpressHeaderOffset
while 1:
data = self.base.read(XpressHeaderOffset, BLOCKSIZE)
Magic_offset = data.find("\x81\x81xpress")
if Magic_offset >= 0:
XpressHeaderOffset += Magic_offset
break
else:
XpressHeaderOffset += len(data)
## Only search this far in advance
if XpressHeaderOffset - original_offset > 10240:
return None, None
XpressHeader = obj.Object("_IMAGE_XPRESS_HEADER", XpressHeaderOffset, self.base)
XpressBlockSize = self.get_xpress_block_size(XpressHeader)
return XpressHeader, XpressBlockSize
def get_xpress_block_size(self, xpress_header):
u0B = xpress_header.u0B.v() << 24
u0A = xpress_header.u0A.v() << 16
u09 = xpress_header.u09.v() << 8
Size = u0B + u0A + u09
Size = Size >> 10
Size = Size + 1
if ((Size % 8) == 0):
return Size
return (Size & ~7) + 8
def get_header(self):
return self.header
def get_base(self):
return self.base
def is_paging(self):
return (self.ProcState.SpecialRegisters.Cr0.v() >> 31) & 1
def is_pse(self):
return (self.ProcState.SpecialRegisters.Cr4.v() >> 4) & 1
def is_pae(self):
return (self.ProcState.SpecialRegisters.Cr4.v() >> 5) & 1
def get_addr(self, addr):
page = addr >> page_shift
if page in self.LookupCache:
(hoffset, size, pageoffset) = self.LookupCache[page]
return hoffset, size, pageoffset
return None, None, None
def get_block_offset(self, _xb, addr):
page = addr >> page_shift
if page in self.LookupCache:
(_hoffset, _size, pageoffset) = self.LookupCache[page]
return pageoffset
return None
def is_valid_address(self, addr):
XpressHeaderOffset, _XpressBlockSize, _XpressPage = self.get_addr(addr)
return XpressHeaderOffset != None
def read_xpress(self, baddr, BlockSize):
try:
return self.PageCache.get(baddr)
except KeyError:
data_read = self.base.read(baddr, BlockSize)
if BlockSize == 0x10000:
data_uz = data_read
else:
data_uz = xpress.xpress_decode(data_read)
self.PageCache.put(baddr, data_uz)
return data_uz
def _partial_read(self, addr, len):
""" A function which reads as much as possible from the current page.
May return a short read.
"""
## The offset within the page where we start
page_offset = (addr & 0x00000FFF)
## How much data can we satisfy?
available = min(PAGE_SIZE - page_offset, len)
ImageXpressHeader, BlockSize, XpressPage = self.get_addr(addr)
if not ImageXpressHeader:
return None
baddr = ImageXpressHeader + 0x20
data = self.read_xpress(baddr, BlockSize)
## Each block decompressed contains 2**page_shift pages. We
## need to know which page to use here.
offset = XpressPage * 0x1000 + page_offset
return data[offset:offset + available]
def read(self, addr, length, zread = False):
result = ''
while length > 0:
data = self._partial_read(addr, length)
if not data:
break
addr += len(data)
length -= len(data)
result += data
if result == '':
if zread:
return ('\0' * length)
result = obj.NoneObject("Unable to read data at " + str(addr) + " for length " + str(length))
return result
def zread(self, addr, length):
stuff_read = self.read(addr, length, zread = True)
return stuff_read
def read_long(self, addr):
_baseaddr = self.get_addr(addr)
string = self.read(addr, 4)
if not string:
return obj.NoneObject("Could not read long at " + str(addr))
longval, = self._long_struct.unpack(string)
return longval
def get_available_pages(self):
page_list = []
for _i, xb in enumerate(self.PageDict.keys()):
for page, _size, _offset in self.PageDict[xb]:
page_list.append([page * 0x1000, 0x1000])
return page_list
def get_address_range(self):
""" This relates to the logical address range that is indexable """
size = self.HighestPage * 0x1000 + 0x1000
return [0, size]
def check_address_range(self, addr):
memrange = self.get_address_range()
if addr < memrange[0] or addr > memrange[1]:
raise IOError
def get_available_addresses(self):
""" This returns the ranges of valid addresses """
for i in self.AddressList:
yield i
def close(self):
self.base.close()
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