/usr/lib/python2.7/dist-packages/rekall/plugins/windows/dumpcerts.py is in python-rekall-core 1.6.0+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 | # Volatility
# Copyright (C) 2007-2013 Volatility Foundation
# Copyright 2013 Google Inc. All Rights Reserved.
#
# Authors:
# Michael Hale Ligh <michael.ligh@mnin.org>
# Michael Cohen <scudette@google.com>
#
# Contributors/References:
# ## Based on sslkeyfinder: http://www.trapkit.de/research/sslkeyfinder/
# 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
try:
from M2Crypto import X509, RSA
except ImportError:
X509 = RSA = None
from rekall import plugin
from rekall import scan
from rekall import testlib
from rekall import utils
from rekall.plugins import core
from rekall.plugins import yarascanner
from rekall.plugins.windows import common
from rekall.plugins.overlays import basic
class CertScanner(scan.BaseScanner):
"""A scanner for certificate ASN.1 objects.
Yara rules for the two ASN.1 encoded objects we are looking for:
'x509' : 'rule x509 {
strings: $a = {30 82 ?? ?? 30 82 ?? ??} condition: $a
}',
'pkcs' : 'rule pkcs {
strings: $a = {30 82 ?? ?? 02 01 00} condition: $a
}',
These rules are very simple, and so we don't really use Yara for this - its
faster to just scan directly.
"""
checks = [
('StringCheck', dict(needle="\x30\x82"))
]
def scan(self, offset=0, maxlen=None):
for hit in super(CertScanner, self).scan(offset=offset, maxlen=maxlen):
signature = self.address_space.read(hit + 4, 3)
size = self.profile.Object(
"unsigned be short", offset=hit+2, vm=self.address_space)
description = None
if signature.startswith("\x30\x82"):
data = self.address_space.read(hit, size + 4)
if X509:
try:
cert = X509.load_cert_der_string(data)
description = utils.SmartStr(cert.get_subject())
except X509.X509Error:
pass
yield hit, "X509", data, description
elif signature.startswith("\x02\x01\x00"):
data = self.address_space.read(hit, size + 4)
if RSA:
try:
pem = ("-----BEGIN RSA PRIVATE KEY-----\n" +
data.encode("base64") +
"-----END RSA PRIVATE KEY-----")
key = RSA.load_key_string(pem)
description = "Verified: %s" % key.check_key()
except Exception:
pass
yield hit, "RSA", data, description
class CertScan(plugin.PhysicalASMixin, plugin.TypedProfileCommand,
plugin.Command):
"""Dump RSA private and public SSL keys from the physical address space."""
__name = "simple_certscan"
# We can just display the certs instead of dumping them.
dump_dir_optional = True
default_dump_dir = None
table_header = [
dict(name="address", style="address"),
dict(name="type", width=10),
dict(name="length", width=10),
dict(name="data", hidden=True),
dict(name="description"),
]
def collect(self):
scanner = CertScanner(
address_space=self.physical_address_space,
session=self.session,
profile=basic.Profile32Bits(session=self.session))
for hit, type, data, description in scanner.scan(
0, self.physical_address_space.end()):
yield dict(address=hit,
type=type,
length=len(data),
data=data,
description=description)
class CertDump(core.DirectoryDumperMixin, CertScan):
"""Dump certs found by cert scan."""
name = "simple_certdump"
table_header = [
dict(name="address", style="address"),
dict(name="type", width=10),
dict(name="Filename", width=30),
dict(name="description"),
]
def collect(self):
renderer = self.session.GetRenderer()
for row in super(CertDump, self).collect():
if self.dump_dir:
row["Filename"] = "%s.%08X.der" % (row["type"], row["address"])
with renderer.open(directory=self.dump_dir,
filename=row["Filename"],
mode="wb") as fd:
fd.write(row["data"])
yield row
class TestCertDump(testlib.HashChecker):
PARAMETERS = dict(
commandline="certdump -D %(tempdir)s",
)
class CertYaraScan(yarascanner.YaraScanMixin, common.WinScanner):
"""Scan certificates in windows memory regions."""
name = "certscan"
table_header = [
dict(name="Owner", width=20),
dict(name="Offset", style="address"),
dict(name="type", width=10),
dict(name="description", width=80),
dict(name="data", hidden=True),
dict(name="Context"),
]
scanner_defaults = dict(
scan_physical=True
)
__args = [
dict(name="yara_file", default=None, hidden=True),
dict(name="yara_expression", hidden=True, default="""
rule x509 {
strings: $a = {30 82 ?? ?? 30 82 ?? ??} condition: $a
}
rule pkcs {
strings: $a = {30 82 ?? ?? 02 01 00} condition: $a
}
"""),
dict(name="hits", default=1000000, type="IntParser",
help="Total number of hits to report."),
]
def verify_hit(self, hit, address_space):
signature = address_space.read(hit + 4, 3)
size = self.profile.Object(
"unsigned be short", offset=hit+2, vm=address_space)
description = None
if signature.startswith("\x30\x82"):
data = address_space.read(hit, size + 4)
if X509:
try:
cert = X509.load_cert_der_string(data)
description = utils.SmartStr(cert.get_subject())
except X509.X509Error:
pass
return "X509", data, description
elif signature.startswith("\x02\x01\x00"):
data = address_space.read(hit, size + 4)
if RSA:
try:
pem = ("-----BEGIN RSA PRIVATE KEY-----\n" +
data.encode("base64") +
"-----END RSA PRIVATE KEY-----")
key = RSA.load_key_string(pem)
description = "Verified: %s" % key.check_key()
except Exception:
pass
return "RSA", data, description
return None, None, None
def collect(self):
for row in super(CertYaraScan, self).collect():
type, data, description = self.verify_hit(
row["Offset"], row["address_space"])
if type is not None:
yield dict(Owner=row["Owner"],
Offset=row["Offset"],
type=type,
description=description,
Context=row["Context"],
data=data)
class TestCertYaraScan(testlib.SimpleTestCase):
PARAMETERS = dict(
commandline="certscan --limit %(limit)s",
limit=20000000
)
class TestCertVadScan(testlib.HashChecker):
PARAMETERS = dict(
commandline="cert_vad_scan --proc_regex %(regex)s -D %(tempdir)s ",
regex="csrss.exe"
)
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