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chainbreaker.py
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#!/usr/bin/python
# Author : n0fate
# E-Mail [email protected], [email protected]
#
# 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
#
import argparse
import os
from sys import exit
import struct
from binascii import unhexlify
import datetime
from hexdump import hexdump
from pbkdf2 import pbkdf2
from pyDes import triple_des, CBC
from ctypes import *
from Schema import *
from validator import Validator
ATOM_SIZE = 4
SIZEOFKEYCHAINTIME = 16
KEYCHAIN_SIGNATURE = "kych"
BLOCKSIZE = 8
KEYLEN = 24
class _APPL_DB_HEADER(BigEndianStructure):
_fields_ = [
("Signature", c_char * 4),
("Version", c_int),
("HeaderSize", c_int),
("SchemaOffset", c_int),
("AuthOffset", c_int)
]
class _APPL_DB_SCHEMA(BigEndianStructure):
_fields_ = [
("SchemaSize", c_int),
("TableCount", c_int)
]
class _KEY_BLOB_REC_HEADER(BigEndianStructure):
_fields_ = [
("RecordSize", c_uint),
("RecordCount", c_uint),
("Dummy", c_char * 0x7C),
]
class _GENERIC_PW_HEADER(BigEndianStructure):
_fields_ = [
("RecordSize", c_uint),
("RecordNumber", c_uint),
("Unknown2", c_uint),
("Unknown3", c_uint),
("SSGPArea", c_uint),
("Unknown5", c_uint),
("CreationDate", c_uint),
("ModDate", c_uint),
("Description", c_uint),
("Comment", c_uint),
("Creator", c_uint),
("Type", c_uint),
("ScriptCode", c_uint),
("PrintName", c_uint),
("Alias", c_uint),
("Invisible", c_uint),
("Negative", c_uint),
("CustomIcon", c_uint),
("Protected", c_uint),
("Account", c_uint),
("Service", c_uint),
("Generic", c_uint)
]
class _APPLE_SHARE_HEADER(BigEndianStructure):
_fields_ = [
("RecordSize", c_uint),
("RecordNumber", c_uint),
("Unknown2", c_uint),
("Unknown3", c_uint),
("SSGPArea", c_uint),
("Unknown5", c_uint),
("CreationDate", c_uint),
("ModDate", c_uint),
("Description", c_uint),
("Comment", c_uint),
("Creator", c_uint),
("Type", c_uint),
("ScriptCode", c_uint),
("PrintName", c_uint),
("Alias", c_uint),
("Invisible", c_uint),
("Negative", c_uint),
("CustomIcon", c_uint),
("Protected", c_uint),
("Account", c_uint),
("Volume", c_uint),
("Server", c_uint),
("Protocol", c_uint),
("AuthType", c_uint),
("Address", c_uint),
("Signature", c_uint)
]
class _INTERNET_PW_HEADER(BigEndianStructure):
_fields_ = [
("RecordSize", c_uint),
("RecordNumber", c_uint),
("Unknown2", c_uint),
("Unknown3", c_uint),
("SSGPArea", c_uint),
("Unknown5", c_uint),
("CreationDate", c_uint),
("ModDate", c_uint),
("Description", c_uint),
("Comment", c_uint),
("Creator", c_uint),
("Type", c_uint),
("ScriptCode", c_uint),
("PrintName", c_uint),
("Alias", c_uint),
("Invisible", c_uint),
("Negative", c_uint),
("CustomIcon", c_uint),
("Protected", c_uint),
("Account", c_uint),
("SecurityDomain", c_uint),
("Server", c_uint),
("Protocol", c_uint),
("AuthType", c_uint),
("Port", c_uint),
("Path", c_uint)
]
class _X509_CERT_HEADER(BigEndianStructure):
_fields_ = [
("RecordSize", c_uint),
("RecordNumber", c_uint),
("Unknown1", c_uint),
("Unknown2", c_uint),
("CertSize", c_uint),
("Unknown3", c_uint),
("CertType", c_uint),
("CertEncoding", c_uint),
("PrintName", c_uint),
("Alias", c_uint),
("Subject", c_uint),
("Issuer", c_uint),
("SerialNumber", c_uint),
("SubjectKeyIdentifier", c_uint),
("PublicKeyHash", c_uint)
]
# http://www.opensource.apple.com/source/Security/Security-55179.1/include/security_cdsa_utilities/KeySchema.h
# http://www.opensource.apple.com/source/libsecurity_keychain/libsecurity_keychain-36940/lib/SecKey.h
class _SECKEY_HEADER(BigEndianStructure):
_fields_ = [
("RecordSize", c_uint32),
("RecordNumber", c_uint32),
("Unknown1", c_uint32),
("Unknown2", c_uint32),
("BlobSize", c_uint32),
("Unknown3", c_uint32),
("KeyClass", c_uint32),
("PrintName", c_uint32),
("Alias", c_uint32),
("Permanent", c_uint32),
("Private", c_uint32),
("Modifiable", c_uint32),
("Label", c_uint32),
("ApplicationTag", c_uint32),
("KeyCreator", c_uint32),
("KeyType", c_uint32),
("KeySizeInBits", c_uint32),
("EffectiveKeySize", c_uint32),
("StartDate", c_uint32),
("EndDate", c_uint32),
("Sensitive", c_uint32),
("AlwaysSensitive", c_uint32),
("Extractable", c_uint32),
("NeverExtractable", c_uint32),
("Encrypt", c_uint32),
("Decrypt", c_uint32),
("Derive", c_uint32),
("Sign", c_uint32),
("Verify", c_uint32),
("SignRecover", c_uint32),
("VerifyRecover", c_uint32),
("Wrap", c_uint32),
("UnWrap", c_uint32)
]
class _TABLE_HEADER(BigEndianStructure):
_fields_ = [
("TableSize", c_uint),
("TableId", c_uint),
("RecordCount", c_uint),
("Records", c_uint),
("IndexesOffset", c_uint),
("FreeListHead", c_uint),
("RecordNumbersCount", c_uint),
]
"""
class _SCHEMA_INFO_RECORD(BigEndianStructure):
_fields_ = [
("RecordSize", c_uint),
("RecordNumber", c_uint),
("Unknown2", c_uint),
("Unknown3", c_uint),
("Unknown4", c_uint),
("Unknown5", c_uint),
("Unknown6", c_uint),
("RecordType", c_uint),
("DataSize", c_uint),
("Data", c_uint)
]
"""
class _COMMON_BLOB(BigEndianStructure):
_fields_ = [
("magic", c_uint32),
("blobVersion", c_uint32)
]
# _ENCRYPTED_BLOB_METADATA
class _KEY_BLOB(BigEndianStructure):
_fields_ = [
("CommonBlob", _COMMON_BLOB),
("startCryptoBlob", c_uint32),
("totalLength", c_uint32),
("iv", c_ubyte * 8)
]
class _DB_PARAMETERS(BigEndianStructure):
_fields_ = [
("idleTimeout", c_uint32), # uint32
("lockOnSleep", c_uint32) # uint8
]
class _DB_BLOB(BigEndianStructure):
_fields_ = [
("CommonBlob", _COMMON_BLOB),
("startCryptoBlob", c_uint32),
("totalLength", c_uint32),
("randomSignature", c_ubyte * 16),
("sequence", c_uint32),
("params", _DB_PARAMETERS),
("salt", c_ubyte * 20),
("iv", c_ubyte * 8),
("blobSignature", c_ubyte * 20)
]
class _SSGP(BigEndianStructure):
_fields_ = [
("magic", c_char * 4),
("label", c_ubyte * 16),
("iv", c_ubyte * 8)
]
# /var/db/SystemKey contains the master key for /Library/Keychains/System.keychain
class _UNLOCK_BLOB(BigEndianStructure):
_fields_ = [
("CommonBlob", _COMMON_BLOB),
("masterKey", c_char*24),
("blobSignature", c_ubyte * 16)
]
def _memcpy(buf, fmt):
return cast(c_char_p(buf), POINTER(fmt)).contents
class KeyChain():
def __init__(self, filepath):
self.filepath = filepath
self.fbuf = ''
def open(self):
try:
fhandle = open(self.filepath, 'rb')
except:
return False
self.fbuf = fhandle.read()
if len(self.fbuf):
fhandle.close()
return True
return False
def checkValidKeychain(self):
if self.fbuf[0:4] != KEYCHAIN_SIGNATURE:
return False
return True
## get apple DB Header
def getHeader(self):
header = _memcpy(self.fbuf[:sizeof(_APPL_DB_HEADER)], _APPL_DB_HEADER)
return header
def getSchemaInfo(self, offset):
table_list = []
# schema_info = struct.unpack(APPL_DB_SCHEMA, self.fbuf[offset:offset + APPL_DB_SCHEMA_SIZE])
_schemainfo = _memcpy(self.fbuf[offset:offset + sizeof(_APPL_DB_SCHEMA)], _APPL_DB_SCHEMA)
for i in xrange(_schemainfo.TableCount):
BASE_ADDR = sizeof(_APPL_DB_HEADER) + sizeof(_APPL_DB_SCHEMA)
table_list.append(
struct.unpack('>I', self.fbuf[BASE_ADDR + (ATOM_SIZE * i):BASE_ADDR + (ATOM_SIZE * i) + ATOM_SIZE])[0])
return _schemainfo, table_list
def getTable(self, offset):
record_list = []
BASE_ADDR = sizeof(_APPL_DB_HEADER) + offset
TableMetaData = _memcpy(self.fbuf[BASE_ADDR:BASE_ADDR + sizeof(_TABLE_HEADER)], _TABLE_HEADER)
RECORD_OFFSET_BASE = BASE_ADDR + sizeof(_TABLE_HEADER)
record_count = 0
offset = 0
while TableMetaData.RecordCount != record_count:
RecordOffset = struct.unpack('>I', self.fbuf[
RECORD_OFFSET_BASE + (ATOM_SIZE * offset):RECORD_OFFSET_BASE + (
ATOM_SIZE * offset) + ATOM_SIZE])[0]
# if len(record_list) >= 1:
# if record_list[len(record_list)-1] >= RecordOffset:
# continue
if (RecordOffset != 0x00) and (RecordOffset % 4 == 0):
record_list.append(RecordOffset)
# print ' [-] Record Offset: 0x%.8x'%RecordOffset
record_count += 1
offset += 1
return TableMetaData, record_list
def getTablenametoList(self, recordList, tableList):
TableDic = {}
for count in xrange(len(recordList)):
tableMeta, GenericList = self.getTable(tableList[count])
TableDic[tableMeta.TableId] = count # extract valid table list
return len(recordList), TableDic
def getKeyblobRecord(self, base_addr, offset):
BASE_ADDR = sizeof(_APPL_DB_HEADER) + base_addr + offset
KeyBlobRecHeader = _memcpy(self.fbuf[BASE_ADDR:BASE_ADDR + sizeof(_KEY_BLOB_REC_HEADER)], _KEY_BLOB_REC_HEADER)
record = self.fbuf[
BASE_ADDR + sizeof(_KEY_BLOB_REC_HEADER):BASE_ADDR + KeyBlobRecHeader.RecordSize] # password data area
KeyBlobRecord = _memcpy(record[:+sizeof(_KEY_BLOB)], _KEY_BLOB)
# hexdump(KeyBlobRecord.iv)
if SECURE_STORAGE_GROUP != str(record[KeyBlobRecord.totalLength + 8:KeyBlobRecord.totalLength + 8 + 4]):
return '', '', '', 1
CipherLen = KeyBlobRecord.totalLength - KeyBlobRecord.startCryptoBlob
if CipherLen % BLOCKSIZE != 0:
print "Bad ciphertext len"
return '', '', '', 1
ciphertext = record[KeyBlobRecord.startCryptoBlob:KeyBlobRecord.totalLength]
# match data, keyblob_ciphertext, Initial Vector, success
return record[KeyBlobRecord.totalLength + 8:KeyBlobRecord.totalLength + 8 + 20], ciphertext, KeyBlobRecord.iv, 0
def getGenericPWRecord(self, base_addr, offset):
record = []
BASE_ADDR = sizeof(_APPL_DB_HEADER) + base_addr + offset
RecordMeta = _memcpy(self.fbuf[BASE_ADDR:BASE_ADDR + sizeof(_GENERIC_PW_HEADER)], _GENERIC_PW_HEADER)
Buffer = self.fbuf[BASE_ADDR + sizeof(
_GENERIC_PW_HEADER):BASE_ADDR + RecordMeta.RecordSize] # record_meta[0] => record size
if RecordMeta.SSGPArea != 0:
record.append(Buffer[:RecordMeta.SSGPArea])
else:
record.append('')
record.append(self.getKeychainTime(BASE_ADDR, RecordMeta.CreationDate & 0xFFFFFFFE))
record.append(self.getKeychainTime(BASE_ADDR, RecordMeta.ModDate & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Description & 0xFFFFFFFE))
record.append(self.getFourCharCode(BASE_ADDR, RecordMeta.Creator & 0xFFFFFFFE))
record.append(self.getFourCharCode(BASE_ADDR, RecordMeta.Type & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.PrintName & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Alias & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Account & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Service & 0xFFFFFFFE))
return record
def getInternetPWRecord(self, base_addr, offset):
record = []
BASE_ADDR = sizeof(_APPL_DB_HEADER) + base_addr + offset
RecordMeta = _memcpy(self.fbuf[BASE_ADDR:BASE_ADDR + sizeof(_INTERNET_PW_HEADER)], _INTERNET_PW_HEADER)
Buffer = self.fbuf[BASE_ADDR + sizeof(_INTERNET_PW_HEADER):BASE_ADDR + RecordMeta.RecordSize]
if RecordMeta.SSGPArea != 0:
record.append(Buffer[:RecordMeta.SSGPArea])
else:
record.append('')
record.append(self.getKeychainTime(BASE_ADDR, RecordMeta.CreationDate & 0xFFFFFFFE))
record.append(self.getKeychainTime(BASE_ADDR, RecordMeta.ModDate & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Description & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Comment & 0xFFFFFFFE))
record.append(self.getFourCharCode(BASE_ADDR, RecordMeta.Creator & 0xFFFFFFFE))
record.append(self.getFourCharCode(BASE_ADDR, RecordMeta.Type & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.PrintName & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Alias & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Protected & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Account & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.SecurityDomain & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Server & 0xFFFFFFFE))
record.append(self.getFourCharCode(BASE_ADDR, RecordMeta.Protocol & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.AuthType & 0xFFFFFFFE))
record.append(self.getInt(BASE_ADDR, RecordMeta.Port & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Path & 0xFFFFFFFE))
return record
def getx509Record(self, base_addr, offset):
record = []
BASE_ADDR = sizeof(_APPL_DB_HEADER) + base_addr + offset
RecordMeta = _memcpy(self.fbuf[BASE_ADDR:BASE_ADDR + sizeof(_X509_CERT_HEADER)], _X509_CERT_HEADER)
x509Certificate = self.fbuf[BASE_ADDR + sizeof(_X509_CERT_HEADER):BASE_ADDR + sizeof(
_X509_CERT_HEADER) + RecordMeta.CertSize]
record.append(self.getInt(BASE_ADDR, RecordMeta.CertType & 0xFFFFFFFE)) # Cert Type
record.append(self.getInt(BASE_ADDR, RecordMeta.CertEncoding & 0xFFFFFFFE)) # Cert Encoding
record.append(self.getLV(BASE_ADDR, RecordMeta.PrintName & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Alias & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Subject & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Issuer & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.SerialNumber & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.SubjectKeyIdentifier & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.PublicKeyHash & 0xFFFFFFFE))
record.append(x509Certificate)
return record
def getKeyRecord(self, base_addr, offset): ## PUBLIC and PRIVATE KEY
record = []
BASE_ADDR = sizeof(_APPL_DB_HEADER) + base_addr + offset
RecordMeta = _memcpy(self.fbuf[BASE_ADDR:BASE_ADDR + sizeof(_SECKEY_HEADER)], _SECKEY_HEADER)
KeyBlob = self.fbuf[BASE_ADDR + sizeof(_SECKEY_HEADER):BASE_ADDR + sizeof(_SECKEY_HEADER) + RecordMeta.BlobSize]
record.append(self.getLV(BASE_ADDR, RecordMeta.PrintName & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Label & 0xFFFFFFFE))
record.append(self.getInt(BASE_ADDR, RecordMeta.KeyClass & 0xFFFFFFFE))
record.append(self.getInt(BASE_ADDR, RecordMeta.Private & 0xFFFFFFFE))
record.append(self.getInt(BASE_ADDR, RecordMeta.KeyType & 0xFFFFFFFE))
record.append(self.getInt(BASE_ADDR, RecordMeta.KeySizeInBits & 0xFFFFFFFE))
record.append(self.getInt(BASE_ADDR, RecordMeta.EffectiveKeySize & 0xFFFFFFFE))
record.append(self.getInt(BASE_ADDR, RecordMeta.Extractable & 0xFFFFFFFE))
record.append(str(self.getLV(BASE_ADDR, RecordMeta.KeyCreator & 0xFFFFFFFE)).split('\x00')[0])
IV, Key = self.getEncryptedDatainBlob(KeyBlob)
record.append(IV)
record.append(Key)
return record
def getEncryptedDatainBlob(self, BlobBuf):
KeyBlob = _memcpy(BlobBuf[:sizeof(_KEY_BLOB)], _KEY_BLOB)
if KeyBlob.CommonBlob.magic != 0xFADE0711:
return '', ''
KeyData = BlobBuf[KeyBlob.startCryptoBlob:KeyBlob.totalLength]
return KeyBlob.iv, KeyData # IV, Encrypted Data
def getKeychainTime(self, BASE_ADDR, pCol):
if pCol <= 0:
return ''
else:
data = str(struct.unpack('>16s', self.fbuf[BASE_ADDR + pCol:BASE_ADDR + pCol + struct.calcsize('>16s')])[0])
return datetime.datetime.strptime(data.strip('\x00'), '%Y%m%d%H%M%SZ')
def getInt(self, BASE_ADDR, pCol):
if pCol <= 0:
return 0
else:
return struct.unpack('>I', self.fbuf[BASE_ADDR + pCol:BASE_ADDR + pCol + 4])[0]
def getFourCharCode(self, BASE_ADDR, pCol):
if pCol <= 0:
return ''
else:
return struct.unpack('>4s', self.fbuf[BASE_ADDR + pCol:BASE_ADDR + pCol + 4])[0]
def getLV(self, BASE_ADDR, pCol):
if pCol <= 0:
return ''
str_length = struct.unpack('>I', self.fbuf[BASE_ADDR + pCol:BASE_ADDR + pCol + 4])[0]
# 4byte arrangement
if (str_length % 4) == 0:
real_str_len = (str_length / 4) * 4
else:
real_str_len = ((str_length / 4) + 1) * 4
unpack_value = '>' + str(real_str_len) + 's'
try:
data = struct.unpack(unpack_value, self.fbuf[BASE_ADDR + pCol + 4:BASE_ADDR + pCol + 4 + real_str_len])[0]
except struct.error:
# print 'Length is too long : %d'%real_str_len
return ''
return data
def getAppleshareRecord(self, base_addr, offset):
record = []
BASE_ADDR = sizeof(_APPL_DB_HEADER) + base_addr + offset
RecordMeta = _memcpy(self.fbuf[BASE_ADDR:BASE_ADDR + sizeof(_APPLE_SHARE_HEADER)], _APPLE_SHARE_HEADER)
Buffer = self.fbuf[BASE_ADDR + sizeof(_APPLE_SHARE_HEADER):BASE_ADDR + RecordMeta.RecordSize]
if RecordMeta.SSGPArea != 0:
record.append(Buffer[:RecordMeta.SSGPArea])
else:
record.append('')
record.append(self.getKeychainTime(BASE_ADDR, RecordMeta.CreationDate & 0xFFFFFFFE))
record.append(self.getKeychainTime(BASE_ADDR, RecordMeta.ModDate & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Description & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Comment & 0xFFFFFFFE))
record.append(self.getFourCharCode(BASE_ADDR, RecordMeta.Creator & 0xFFFFFFFE))
record.append(self.getFourCharCode(BASE_ADDR, RecordMeta.Type & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.PrintName & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Alias & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Protected & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Account & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Volume & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Server & 0xFFFFFFFE))
record.append(self.getFourCharCode(BASE_ADDR, RecordMeta.Protocol & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Address & 0xFFFFFFFE))
record.append(self.getLV(BASE_ADDR, RecordMeta.Signature & 0xFFFFFFFE))
return record
## decrypted dbblob area
## Documents : http://www.opensource.apple.com/source/securityd/securityd-55137.1/doc/BLOBFORMAT
## http://www.opensource.apple.com/source/libsecurity_keychain/libsecurity_keychain-36620/lib/StorageManager.cpp
def SSGPDecryption(self, ssgp, dbkey):
SSGP = _memcpy(ssgp, _SSGP)
plain = kcdecrypt(dbkey, SSGP.iv, ssgp[sizeof(_SSGP):])
return plain
# Documents : http://www.opensource.apple.com/source/securityd/securityd-55137.1/doc/BLOBFORMAT
# source : http://www.opensource.apple.com/source/libsecurity_cdsa_client/libsecurity_cdsa_client-36213/lib/securestorage.cpp
# magicCmsIV : http://www.opensource.apple.com/source/Security/Security-28/AppleCSP/AppleCSP/wrapKeyCms.cpp
def KeyblobDecryption(self, encryptedblob, iv, dbkey):
magicCmsIV = unhexlify('4adda22c79e82105')
plain = kcdecrypt(dbkey, magicCmsIV, encryptedblob)
if plain.__len__() == 0:
return ''
# now we handle the unwrapping. we need to take the first 32 bytes,
# and reverse them.
revplain = ''
for i in range(32):
revplain += plain[31 - i]
# now the real key gets found. */
plain = kcdecrypt(dbkey, iv, revplain)
keyblob = plain[4:]
if len(keyblob) != KEYLEN:
# raise "Bad decrypted keylen!"
return ''
return keyblob
# test code
# http://opensource.apple.com/source/libsecurity_keychain/libsecurity_keychain-55044/lib/KeyItem.cpp
def PrivateKeyDecryption(self, encryptedblob, iv, dbkey):
magicCmsIV = unhexlify('4adda22c79e82105')
plain = kcdecrypt(dbkey, magicCmsIV, encryptedblob)
if plain.__len__() == 0:
return '', ''
# now we handle the unwrapping. we need to take the first 32 bytes,
# and reverse them.
revplain = ''
for i in range(len(plain)):
revplain += plain[len(plain) - 1 - i]
# now the real key gets found. */
plain = kcdecrypt(dbkey, iv, revplain)
Keyname = plain[:12] # Copied Buffer when user click on right and copy a key on Keychain Access
keyblob = plain[12:]
return Keyname, keyblob
## Documents : http://www.opensource.apple.com/source/securityd/securityd-55137.1/doc/BLOBFORMAT
def generateMasterKey(self, pw, symmetrickey_offset):
base_addr = sizeof(_APPL_DB_HEADER) + symmetrickey_offset + 0x38 # header
dbblob = _memcpy(self.fbuf[base_addr:base_addr + sizeof(_DB_BLOB)], _DB_BLOB)
masterkey = pbkdf2(pw, str(bytearray(dbblob.salt)), 1000, KEYLEN)
return masterkey
## find DBBlob and extract Wrapping key
def findWrappingKey(self, master, symmetrickey_offset):
base_addr = sizeof(_APPL_DB_HEADER) + symmetrickey_offset + 0x38
dbblob = _memcpy(self.fbuf[base_addr:base_addr + sizeof(_DB_BLOB)], _DB_BLOB)
# get cipher text area
ciphertext = self.fbuf[base_addr + dbblob.startCryptoBlob:base_addr + dbblob.totalLength]
# decrypt the key
plain = kcdecrypt(master, dbblob.iv, ciphertext)
if plain.__len__() < KEYLEN:
return ''
dbkey = plain[:KEYLEN]
# return encrypted wrapping key
return dbkey
# SOURCE : extractkeychain.py
def kcdecrypt(key, iv, data):
if len(data) == 0:
# print>>stderr, "FileSize is 0"
return ''
if len(data) % BLOCKSIZE != 0:
return ''
cipher = triple_des(key, CBC, str(bytearray(iv)))
# the line below is for pycrypto instead
# cipher = DES3.new( key, DES3.MODE_CBC, iv )
plain = cipher.decrypt(data)
# now check padding
pad = ord(plain[-1])
if pad > 8:
# print>> stderr, "Bad padding byte. You probably have a wrong password"
return ''
for z in plain[-pad:]:
if ord(z) != pad:
# print>> stderr, "Bad padding. You probably have a wrong password"
return ''
plain = plain[:-pad]
return plain
BASEPATH = os.getcwd() + '/exported/'
if not os.path.exists(BASEPATH):
os.makedirs(BASEPATH)
def add_file(directory, filename='default', key=None, cert=None):
# print 'into function key={}, cert={}'.format(key, cert)
target_path = BASEPATH + directory
if not os.path.exists(target_path):
os.makedirs(target_path)
if key is not None:
with open(target_path + '/{}.key'.format(filename), 'w+') as f:
f.write(key)
if cert is not None:
with open(target_path + '/{}.crt'.format(filename), 'w+') as f:
f.write(cert)
def main():
parser = argparse.ArgumentParser(description='Tool for OS X Keychain Analysis by @n0fate')
parser.add_argument('-f', '--file', nargs=1, help='Keychain file(*.keychain)', required=True)
# parser.add_argument('-x', '--exportfile', nargs=1, help='Export a filename (SQLite, optional)', required=False)
group = parser.add_mutually_exclusive_group(required=True)
group.add_argument('-k', '--key', nargs=1, help='Keychain Masterkey', required=False)
group.add_argument('-u', '--unlockfile', nargs=1, help='System.keychain unlock file (/var/db/SystemKey)', required=False)
group.add_argument('-p', '--password', nargs=1, help='Keychain Password', required=False)
args = parser.parse_args()
if os.path.exists(args.file[0]) is False:
print '[!] ERROR: Keychain is not exists'
parser.print_help()
exit()
keychain = KeyChain(args.file[0])
if keychain.open() is False:
print '[!] ERROR: %s Open Failed' % args.file[0]
parser.print_help()
exit()
KeychainHeader = keychain.getHeader()
if KeychainHeader.Signature != KEYCHAIN_SIGNATURE:
print '[!] ERROR: Invalid Keychain Format'
parser.print_help()
exit()
SchemaInfo, TableList = keychain.getSchemaInfo(KeychainHeader.SchemaOffset)
TableMetadata, RecordList = keychain.getTable(TableList[0])
tableCount, tableEnum = keychain.getTablenametoList(RecordList, TableList)
# generate database key
if args.password is not None:
masterkey = keychain.generateMasterKey(args.password[0], TableList[tableEnum[CSSM_DL_DB_RECORD_METADATA]])
dbkey = keychain.findWrappingKey(masterkey, TableList[tableEnum[CSSM_DL_DB_RECORD_METADATA]])
elif args.key is not None:
dbkey = keychain.findWrappingKey(unhexlify(args.key[0]), TableList[tableEnum[CSSM_DL_DB_RECORD_METADATA]])
elif args.unlockfile is not None:
with open(args.unlockfile[0], mode='rb') as uf:
filecontent = uf.read()
unlockkeyblob = _memcpy(filecontent, _UNLOCK_BLOB)
dbkey = keychain.findWrappingKey(unlockkeyblob.masterKey, TableList[tableEnum[CSSM_DL_DB_RECORD_METADATA]])
else:
print '[!] ERROR: password or master key candidate is invalid'
exit()
if len(dbkey) == 0:
print '[!] ERROR: password or master key candidate is invalid'
exit()
# DEBUG
print ' [-] DB Key'
# hexdump(dbkey)
key_list = {} # keyblob list
# get symmetric key blob
print '[+] Symmetric Key Table:'
# print '0x%.8x' % (
# sizeof(_APPL_DB_HEADER) + TableList[tableEnum[CSSM_DL_DB_RECORD_SYMMETRIC_KEY]])
TableMetadata, symmetrickey_list = keychain.getTable(TableList[tableEnum[CSSM_DL_DB_RECORD_SYMMETRIC_KEY]])
for symmetrickey_record in symmetrickey_list:
keyblob, ciphertext, iv, return_value = keychain.getKeyblobRecord(
TableList[tableEnum[CSSM_DL_DB_RECORD_SYMMETRIC_KEY]],
symmetrickey_record)
if return_value == 0:
passwd = keychain.KeyblobDecryption(ciphertext, iv, dbkey)
if passwd != '':
key_list[keyblob] = passwd
try:
TableMetadata, genericpw_list = keychain.getTable(TableList[tableEnum[CSSM_DL_DB_RECORD_GENERIC_PASSWORD]])
for genericpw in genericpw_list:
record = keychain.getGenericPWRecord(TableList[tableEnum[CSSM_DL_DB_RECORD_GENERIC_PASSWORD]], genericpw)
print '[+] Generic Password Record'
try:
real_key = key_list[record[0][0:20]]
passwd = keychain.SSGPDecryption(record[0], real_key)
except KeyError:
passwd = ''
print ' [-] Create DateTime: %s' % record[1] # 16byte string
print ' [-] Last Modified DateTime: %s' % record[2] # 16byte string
print ' [-] Description : %s' % record[3]
print ' [-] Creator : %s' % record[4]
print ' [-] Type : %s' % record[5]
print ' [-] PrintName : %s' % record[6]
print ' [-] Alias : %s' % record[7]
print ' [-] Account : %s' % record[8]
print ' [-] Service : %s' % record[9]
print ' [-] Password'
hexdump(passwd)
print ''
except KeyError:
print '[!] Generic Password Table is not available'
pass
try:
TableMetadata, internetpw_list = keychain.getTable(TableList[tableEnum[CSSM_DL_DB_RECORD_INTERNET_PASSWORD]])
for internetpw in internetpw_list:
record = keychain.getInternetPWRecord(TableList[tableEnum[CSSM_DL_DB_RECORD_INTERNET_PASSWORD]], internetpw)
print '[+] Internet Record'
try:
real_key = key_list[record[0][0:20]]
passwd = keychain.SSGPDecryption(record[0], real_key)
except KeyError:
passwd = ''
print ' [-] Create DateTime: %s' % record[1] # 16byte string
print ' [-] Last Modified DateTime: %s' % record[2] # 16byte string
print ' [-] Description : %s' % record[3]
print ' [-] Comment : %s' % record[4]
print ' [-] Creator : %s' % record[5]
print ' [-] Type : %s' % record[6]
print ' [-] PrintName : %s' % record[7]
print ' [-] Alias : %s' % record[8]
print ' [-] Protected : %s' % record[9]
print ' [-] Account : %s' % record[10]
print ' [-] SecurityDomain : %s' % record[11]
print ' [-] Server : %s' % record[12]
try:
print ' [-] Protocol Type : %s' % PROTOCOL_TYPE[record[13]]
except KeyError:
print ' [-] Protocol Type : %s' % record[13]
try:
print ' [-] Auth Type : %s' % AUTH_TYPE[record[14]]
except KeyError:
print ' [-] Auth Type : %s' % record[14]
print ' [-] Port : %d' % record[15]
print ' [-] Path : %s' % record[16]
print ' [-] Password'
hexdump(passwd)
print ''
except KeyError:
print '[!] Internet Password Table is not available'
pass
try:
TableMetadata, applesharepw_list = keychain.getTable(
TableList[tableEnum[CSSM_DL_DB_RECORD_APPLESHARE_PASSWORD]])
for applesharepw in applesharepw_list:
record = keychain.getAppleshareRecord(TableList[tableEnum[CSSM_DL_DB_RECORD_APPLESHARE_PASSWORD]],
applesharepw)
print '[+] AppleShare Record (no more used OS X)'
try:
real_key = key_list[record[0][0:20]]
passwd = keychain.SSGPDecryption(record[0], real_key)
except KeyError:
passwd = ''
# print ''
# print ' [-] Create DateTime: %s' % record[1] # 16byte string
# print ' [-] Last Modified DateTime: %s' % record[2] # 16byte string
# print ' [-] Description : %s' % record[3]
# print ' [-] Comment : %s' % record[4]
# print ' [-] Creator : %s' % record[5]
# print ' [-] Type : %s' % record[6]
# print ' [-] PrintName : %s' % record[7]
# print ' [-] Alias : %s' % record[8]
# print ' [-] Protected : %s' % record[9]
# print ' [-] Account : %s' % record[10]
# print ' [-] Volume : %s' % record[11]
# print ' [-] Server : %s' % record[12]
# try:
# print ' [-] Protocol Type : %s' % PROTOCOL_TYPE[record[13]]
# except KeyError:
# print ' [-] Protocol Type : %s' % record[13]
# print ' [-] Address : %d' % record[14]
# print ' [-] Signature : %s' % record[15]
# print ' [-] Password'
# hexdump(passwd)
# print ''
except KeyError:
print '[!] AppleShare Table is not available'
pass
try:
TableMetadata, x509CertList = keychain.getTable(TableList[tableEnum[CSSM_DL_DB_RECORD_X509_CERTIFICATE]])
for i, x509Cert in enumerate(x509CertList, 1):
record = keychain.getx509Record(TableList[tableEnum[CSSM_DL_DB_RECORD_X509_CERTIFICATE]], x509Cert)
print '[+] Certificate'
# print ' [-] Cert Type: %s' % CERT_TYPE[record[0]]
# print ' [-] Cert Encoding: %s' % CERT_ENCODING[record[1]]
# print ' [-] PrintName : %s' % record[2]
# print ' [-] Alias : %s' % record[3]
# print ' [-] Subject'
# hexdump(record[4])
# print ' [-] Issuer :'
# hexdump(record[5])
# print ' [-] SerialNumber'
# hexdump(record[6])
# print ' [-] SubjectKeyIdentifier'
# hexdump(record[7])
# print ' [-] Public Key Hash'
# hexdump(record[8])
# print ' [-] Certificate'
add_file(directory='certs', filename=str(i), cert=str(record[9]))
# hexdump(record[9])
# print ''
except KeyError:
print '[!] Certification Table is not available'
pass
try:
TableMetadata, PublicKeyList = keychain.getTable(TableList[tableEnum[CSSM_DL_DB_RECORD_PUBLIC_KEY]])
for PublicKey in PublicKeyList:
record = keychain.getKeyRecord(TableList[tableEnum[CSSM_DL_DB_RECORD_PUBLIC_KEY]], PublicKey)
print '[+] Public Key Record'
# print ' [-] PrintName: %s' % record[0]
# print ' [-] Label'
# hexdump(record[1])
# print ' [-] Key Class : %s' % KEY_TYPE[record[2]]
# print ' [-] Private : %d' % record[3]
# print ' [-] Key Type : %s' % CSSM_ALGORITHMS[record[4]]
# print ' [-] Key Size : %d bits' % record[5]
# print ' [-] Effective Key Size : %d bits' % record[6]
# print ' [-] Extracted : %d' % record[7]
# print ' [-] CSSM Type : %s' % STD_APPLE_ADDIN_MODULE[record[8]]
# print ' [-] Public Key'
# hexdump(record[10])
# print ''
except KeyError:
print '[!] Public Key Table is not available'
pass
try:
table_meta, PrivateKeyList = keychain.getTable(TableList[tableEnum[CSSM_DL_DB_RECORD_PRIVATE_KEY]])
for i, PrivateKey in enumerate(PrivateKeyList, 1):
record = keychain.getKeyRecord(TableList[tableEnum[CSSM_DL_DB_RECORD_PRIVATE_KEY]], PrivateKey)
print '[+] Private Key Record'
# print ' [-] PrintName: %s' % record[0]
# print ' [-] Label'
# hexdump(record[1])
# print ' [-] Key Class : %s' % KEY_TYPE[record[2]]
# print ' [-] Private : %d' % record[3]
# print ' [-] Key Type : %s' % CSSM_ALGORITHMS[record[4]]
# print ' [-] Key Size : %d bits' % record[5]
# print ' [-] Effective Key Size : %d bits' % record[6]
# print ' [-] Extracted : %d' % record[7]
# print ' [-] CSSM Type : %s' % STD_APPLE_ADDIN_MODULE[record[8]]