/usr/lib/python2.7/dist-packages/rekall/plugins/windows/gui/autodetect.py is in python-rekall-core 1.6.0+dfsg-2.
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# Copyright 2014 Google Inc. All Rights Reserved.
#
# This program 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.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
"""Autodetect struct layout of various Win32k GUI structs.
Many win32k structs are undocumented (i.e. are not present in pdb
symbols). These structures do change a lot between versions of windows. This
module autodetects the struct layout using various heuristics.
"""
import re
from rekall.plugins.windows import common
class Win32kAutodetect(common.WindowsCommandPlugin):
"""Automatically detect win32k struct layout."""
name = "win32k_autodetect"
table_header = [
dict(name="divider", type="Divider"),
dict(name="field", width=20),
dict(name="offset", style="address"),
dict(name="definition")
]
def collect(self):
win32k_module = self.session.address_resolver.GetModuleByName(
"win32k")
win32k_profile = win32k_module.profile
overlay = self.GetWin32kOverlay(win32k_profile)
for struct, definition in overlay.items():
yield dict(divider="Struct %s" % struct)
for field, (offset, field_def) in sorted(definition[1].items(),
key=lambda x: x[1]):
yield dict(field=field, offset=offset,
definition=str(field_def))
def GetWin32kOverlay(self, win32k_profile):
# Make a temporary profile to work with.
self.temp_profile = win32k_profile
self.analyze_struct = self.session.plugins.analyze_struct(0)
# Start off with an empty overlay.
overlay = dict(tagDESKTOP=[None, {}],
tagWINDOWSTATION=[None, {}],
tagTHREADINFO=[None, {}],
)
with self.session.plugins.cc() as cc:
for task in self.session.plugins.pslist().filter_processes():
cc.SwitchProcessContext(task)
# Find a process context which makes the symbol valid.
if not self.wndstation():
continue
try:
self.Get_tagWINDOWSTATION_overlay(overlay)
self.Get_tagDESKTOP_overlay(overlay)
self.Get_tagTHREADINFO_overlay(overlay)
return overlay
except RuntimeError:
continue
return overlay
def wndstation(self):
return self.temp_profile.get_constant_object(
"grpWinStaList",
target="Pointer",
target_args=dict(
target="tagWINDOWSTATION")
).deref()
def _Match(self, regex, info):
for item in info:
if re.match(regex, item):
return True
def _AddField(self, regex, info, field_name, fields, description):
if field_name not in fields and self._Match(regex, info):
fields[field_name] = description
self.session.logging.debug(
"Detected field %s: %s @ %#x", field_name, info, description[0])
return True
def Get_tagWINDOWSTATION_overlay(self, overlay):
"""Derive the tagWINDOWSTATION overlay."""
fields = {}
offset = self.wndstation()
required_fields = set([
"rpwinstaNext", "rpdeskList", "pGlobalAtomTable"])
stations = set()
while not offset == None and offset not in stations:
stations.add(offset)
self.session.logging.debug("Checking tagWINDOWSTATION at %#x",
offset)
for o, info in self.analyze_struct.GuessMembers(offset, size=0x200):
if self._AddField(
"Tag:Win", info, "rpwinstaNext", fields,
[o, ["Pointer", dict(
target="tagWINDOWSTATION"
)]]):
continue
elif self._AddField(
"Tag:Des", info, "rpdeskList", fields,
[o, ["Pointer", dict(
target="tagDESKTOP"
)]]):
continue
elif self._AddField(
"Tag:AtmT", info, "pGlobalAtomTable", fields,
[o, ["Pointer", dict(
target="_RTL_ATOM_TABLE"
)]]):
continue
elif self._AddField(
"Const:win32k!gTerm", info, "pTerm", fields,
[o, ["Pointer", dict(
target="tagTERMINAL"
)]]):
continue
else:
self.session.logging.debug(
"Unhandled field %#x, %s" % (o, info))
continue
# Add the derived overlay to the profile so we can walk the list
# of window stations.
self.temp_profile.add_overlay(overlay)
offset = self.temp_profile.tagWINDOWSTATION(offset).rpwinstaNext
# We worked out all the fields, return the overlay.
if required_fields.issubset(fields):
overlay["tagWINDOWSTATION"][1].update(fields)
return overlay
self.session.logging.debug(
"tagWINDOWSTATION: Missing required fields %s",
required_fields.difference(fields))
raise RuntimeError("Unable to guess tagWINDOWSTATION")
def Get_tagDESKTOP_overlay(self, overlay):
fields = {}
required_fields = set([
"rpdeskNext", "rpwinstaParent", "hsectionDesktop"])
# Iterate over all tagDESKTOP objects.
desktops = set()
offset = self.wndstation().rpdeskList.v()
while not offset == None and offset not in desktops:
self.session.logging.debug("Checking tagDESKTOP at %#x", offset)
desktops.add(offset)
for o, info in self.analyze_struct.GuessMembers(
offset, search=0x400):
if self._AddField("Tag:Des", info, "rpdeskNext", fields,
[o, ["Pointer", dict(
target="tagDESKTOP"
)]]):
continue
elif self._AddField("Tag:Win", info, "rpwinstaParent", fields,
[o, ["Pointer", dict(
target="tagWINDOWSTATION"
)]]):
continue
elif self._AddField("Tag:Sec", info, "hsectionDesktop", fields,
[o, ["Pointer", dict(
target="_SECTION_OBJECT"
)]]):
continue
# The PtiList is a _LIST_ENTRY to a tagTHREADINFO (Usti tag).
elif ("_LIST_ENTRY" in info and
self._AddField("Tag:Usti", info, "PtiList", fields,
[o, ["_LIST_ENTRY"]])):
continue
# On WinXP a tagTHREADINFO allocation contains ProcessBilled.
elif ("_LIST_ENTRY" in info and not self._Match("Tag:", info)
and self._AddField(
"ProcessBilled:", info, "PtiList", fields,
[o, ["_LIST_ENTRY"]])):
continue
else:
self.session.logging.debug(
"Unhandled field %#x %s" % (o, info))
continue
# Add the derived overlay to the profile so we can walk the list
# of window stations.
self.temp_profile.add_overlay(overlay)
offset = self.temp_profile.tagDESKTOP(offset).rpdeskNext
# We worked out all the fields, return the overlay.
if required_fields.issubset(fields):
overlay["tagDESKTOP"][1].update(fields)
return overlay
self.session.logging.debug(
"tagDESKTOP: Missing required fields %s",
required_fields.difference(fields))
raise RuntimeError("Unable to guess tagDESKTOP")
def _Check_tagPROCESSINFO(self, offset):
"""Checks if a pointer points to tagPROCESSINFO."""
pointer = self.profile.Pointer(offset)
pool = self.analyze_struct.SearchForPoolHeader(pointer.v())
if pool.Tag == "Uspi":
return True
# Its definitely not a tagPROCESSINFO if it is a tagTHREADINFO.
if pool.Tag in ["Usti"]:
return False
# In windows XP tagPROCESSINFO allocations contain the _EPROCESS
# address in the ProcessBilled field of the allocation.
if pool.m("ProcessBilled").Peb:
return True
return False
def _AnalyzeTagTHREADINFO(self, offset, fields):
self.session.logging.debug("Checking tagTHREADINFO at %#x", offset)
for o, info in self.analyze_struct.GuessMembers(
offset, size=0x400, search=0x600):
if self._AddField("Tag:Thr", info, "pEThread", fields,
[o, ["Pointer", dict(
target="_ETHREAD"
)]]):
continue
elif self._AddField("Tag:Usqu", info, "pq", fields,
[o, ["Pointer", dict(
target="tagQ"
)]]):
continue
elif self._AddField("Tag:Uskb", info, "spklActive", fields,
[o, ["Pointer", dict(
target="tagKL"
)]]):
continue
elif self._AddField("Tag:Des", info, "rpdesk", fields,
[o, ["Pointer", dict(
target="tagDESKTOP"
)]]):
continue
elif ("_LIST_ENTRY" in info and
self._AddField("Tag:Usti", info, "GdiTmpTgoList", fields,
[o, ["_LIST_ENTRY"]])):
continue
elif (self._Check_tagPROCESSINFO(offset + o) and
self._AddField(".", info, "ppi", fields,
[o, ["Pointer", dict(
target="tagPROCESSINFO"
)]])):
continue
else:
self.session.logging.debug("Unhandled field %#x %s" % (o, info))
continue
def Get_tagTHREADINFO_overlay(self, overlay):
fields = {}
required_fields = set([
"pEThread", "pq", "spklActive", "rpdesk", "PtiLink", "ppi"
])
# Iterate over all tagTHREADINFO objects.
thread_infos = set()
for wndstation in self.wndstation().rpwinstaNext.walk_list(
"rpwinstaNext"):
for desktop in wndstation.rpdeskList.walk_list("rpdeskNext"):
thread_info_pool = self.analyze_struct.SearchForPoolHeader(
desktop.PtiList.Flink.v(), search=0x600)
if thread_info_pool and thread_info_pool not in thread_infos:
thread_infos.add(thread_info_pool)
# We can already determine the tagTHREADINFO's PtiLink:
PtiLink_offset = (desktop.PtiList.Flink.v() -
thread_info_pool.obj_end)
fields["PtiLink"] = [PtiLink_offset, ["_LIST_ENTRY"]]
self._AnalyzeTagTHREADINFO(thread_info_pool.obj_end, fields)
self.temp_profile.add_overlay(overlay)
# We worked out all the fields, return the overlay.
if required_fields.issubset(fields):
overlay["tagTHREADINFO"][1].update(fields)
return overlay
self.session.logging.debug(
"tagTHREADINFO: Missing required fields %s",
required_fields.difference(fields))
raise RuntimeError("Unable to guess tagTHREADINFO")
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