mirror of
https://github.com/volatilityfoundation/volatility
synced 2026-06-08 18:04:46 +00:00
mike.auty@gmail.com
120 lines
4.2 KiB
Python
120 lines
4.2 KiB
Python
# Volatility
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#
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#
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# This program 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 (at
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# your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# 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 this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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@author: Bradley Schatz
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@license: GNU General Public License 2.0 or later
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@contact: bradley@schatzforensic.com.au
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@organization: Schatz Forensic
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"""
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import struct
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import volatility.utils as utils
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import volatility.scan as scan
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import volatility.cache as cache
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import volatility.commands as commands
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import volatility.obj as obj
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class KPCRScan(commands.command):
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"""Search for and dump potential KPCR values"""
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meta_info = dict(
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author = 'Bradley Schatz',
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copyright = 'Copyright (c) 2010 Bradley Schatz',
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contact = 'bradley@schatzforensic.com.au',
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license = 'GNU General Public License 2.0 or later',
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url = 'http://www.schatzforensic.com.au/',
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os = 'WIN_32_VISTA_SP0',
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version = '1.0',
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)
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@staticmethod
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def register_options(config):
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config.add_option('KPCR', short_option = 'k', default = None, type = 'int',
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help = "Specify a specific KPCR address")
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@cache.CacheDecorator("tests/kpcrscan")
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def calculate(self):
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"""Determines the address space"""
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addr_space = utils.load_as(self._config, astype = 'any')
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scanner = KPCRScanner()
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for o in scanner.scan(addr_space):
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# print "Phys addr", "{0:08x}".format(addr_space.vtop(o)), "Virt addr", "{0:08x}".format(o)
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yield o
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def render_text(self, outfd, data):
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"""Renders the KPCR values as text"""
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outfd.write("Potential KPCR structure virtual addresses:\n")
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for o in data:
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outfd.write(" _KPCR: {0:#010x}\n".format(o))
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class KPCRScannerCheck(scan.ScannerCheck):
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"""Checks the self referential pointers to find KPCRs"""
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def __init__(self, address_space):
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scan.ScannerCheck.__init__(self, address_space)
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kpcr = obj.Object("_KPCR", vm = self.address_space, offset = 0)
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self.SelfPcr_offset = kpcr.SelfPcr.obj_offset
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self.Prcb_offset = kpcr.Prcb.obj_offset
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self.PrcbData_offset = kpcr.PrcbData.obj_offset
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self.KPCR = None
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def check(self, offset):
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""" We check that _KCPR.pSelfPCR points to the start of the _KCPR struct """
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paKCPR = offset
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paPRCBDATA = offset + self.PrcbData_offset
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try:
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pSelfPCR = obj.Object('unsigned long', offset = (offset + self.SelfPcr_offset), vm = self.address_space)
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pPrcb = obj.Object('unsigned long', offset = (offset + self.Prcb_offset), vm = self.address_space)
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if (pSelfPCR == paKCPR and pPrcb == paPRCBDATA):
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self.KPCR = pSelfPCR
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return True
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except Exception:
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return False
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return False
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# make the scan DWROD aligned
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def skip(self, data, offset):
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return 4
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offset_string = struct.pack("I", offset)
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new_offset = offset
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## A successful match will need to at least match the Most
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## Significant 3 bytes
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while (new_offset + self.SelfPcr_offset) & 0xFF >= self.SelfPcr_offset:
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new_offset = data.find(offset_string[3], new_offset + 1)
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## Its not there, skip the whole buffer
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if new_offset < 0:
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return len(data) - offset
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if (new_offset % 4) == 0:
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return new_offset - self.SelfPcr_offset - 1
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return len(data) - offset
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class KPCRScanner(scan.DiscontigScanner):
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checks = [ ("KPCRScannerCheck", {})
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]
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def scan(self, address_space, offset = 0, maxlen = None):
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return scan.DiscontigScanner.scan(self, address_space, max(offset, 0x80000000), maxlen)
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