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chainbreaker.py
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chainbreaker.py
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#!/usr/bin/python3
# Author : n0fate
# E-Mail rapfer@gmail.com, n0fate@n0fate.com
#
# 10/7/2020 - Significant changes made by luke@socially-inept.net
#
# 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 struct
from pbkdf2 import PBKDF2
from schema import *
from schema import _APPL_DB_HEADER, _APPL_DB_SCHEMA, _TABLE_HEADER, _DB_BLOB, _GENERIC_PW_HEADER, \
_KEY_BLOB_REC_HEADER, _KEY_BLOB, _SSGP, _INTERNET_PW_HEADER, _APPLE_SHARE_HEADER, _X509_CERT_HEADER, _SECKEY_HEADER, \
_UNLOCK_BLOB, _KEYCHAIN_TIME, _INT, _FOUR_CHAR_CODE, _LV, _TABLE_ID, _RECORD_OFFSET
from pyDes import TripleDES, CBC
from binascii import unhexlify, hexlify
import logging
import base64
import string
import uuid
printable_chars = bytes(string.printable, 'ascii')
class Chainbreaker(object):
ATOM_SIZE = 4
KEYCHAIN_SIGNATURE = "kych"
BLOCKSIZE = 8
KEYLEN = 24
MAGIC_CMS_IV = unhexlify('4adda22c79e82105')
KEYCHAIN_LOCKED_SIGNATURE = '[Invalid Password / Keychain Locked]'
def __init__(self, filepath, unlock_password=None, unlock_key=None, unlock_file=None):
self._filepath = None
self._unlock_password = None
self._unlock_key = None
self._unlock_file = None
self._db_key = None
# Raw buffer of keychain file contents
self.kc_buffer = ''
self.header = None
self.schema_info = None
self.table_list = None
self.table_metadata = None
self.record_list = None
self.table_count = None
self.table_enum = None
self.symmetric_key_list = None
self.symmetric_key_offset = None
self.dbblob = None
self.locked = True
self.logger = logging.getLogger('Chainbreaker')
self.key_list = {}
self.db_key = None
self.filepath = filepath
if not self._is_valid_keychain():
self.logger.warning('Keychain signature does not match. are you sure this is a valid keychain file?')
self.unlock_password = unlock_password
self.unlock_key = unlock_key
self.unlock_file = unlock_file
# Returns a list of GenericPasswordRecord objects extracted from the Keychain
def dump_generic_passwords(self):
entries = []
try:
table_metadata, generic_pw_list = self._get_table_from_type(CSSM_DL_DB_RECORD_GENERIC_PASSWORD)
for generic_pw_id in generic_pw_list:
entries.append(self._get_generic_password_record(generic_pw_id))
except KeyError:
self.logger.warning('[!] Generic Password Table is not available')
return entries
# Returns a list of InterertPasswordRecord objects extracted from the Keychain
def dump_internet_passwords(self):
entries = []
try:
table_metadata, internet_pw_list = self._get_table_from_type(CSSM_DL_DB_RECORD_INTERNET_PASSWORD)
for internet_pw_id in internet_pw_list:
entries.append(self._get_internet_password_record(internet_pw_id))
except KeyError:
self.logger.warning('[!] Internet Password Table is not available')
return entries
# Returns a list of AppleshareRecord objects extracted from the Keychain
def dump_appleshare_passwords(self):
entries = []
try:
table_metadata, appleshare_pw_list = self._get_table_from_type(CSSM_DL_DB_RECORD_APPLESHARE_PASSWORD)
for appleshare_pw_offset in appleshare_pw_list:
entries.append(self._get_appleshare_record(appleshare_pw_offset))
except KeyError:
self.logger.warning('[!] Appleshare Records Table is not available')
return entries
# Returns a list of X509CertfificateRecord objects extracted from the Keychain
def dump_x509_certificates(self):
entries = []
try:
table_metadata, x509_cert_list = self._get_table_from_type(CSSM_DL_DB_RECORD_X509_CERTIFICATE)
for i, x509_cert_offset in enumerate(x509_cert_list, 1):
entries.append(self._get_x_509_record(x509_cert_offset))
except KeyError:
self.logger.warning('[!] Certificate Table is not available')
return entries
# Returns a list of PublicKeyRecord objects extracted from the Keychain
def dump_public_keys(self):
entries = []
try:
table_metadata, public_key_list = self._get_table_from_type(CSSM_DL_DB_RECORD_PUBLIC_KEY)
for public_key_offset in public_key_list:
entries.append(
self._get_public_key_record(public_key_offset))
except KeyError:
self.logger.warning('[!] Public Key Table is not available')
return entries
# Returns a list of PrivateKeyRecord objects extracted from the Keychain
def dump_private_keys(self):
entries = []
try:
table_meta, private_key_list = self._get_table_from_type(CSSM_DL_DB_RECORD_PRIVATE_KEY)
for i, private_key_offset in enumerate(private_key_list, 1):
try:
# print("private_key_offset", self._get_private_key_record(private_key_offset))
entries.append(
self._get_private_key_record(private_key_offset))
except Exception as e:
self.logger.warning(e)
except KeyError:
self.logger.warning('[!] Private Key Table is not available')
return entries
# Attempts to read the keychain file into self.kc_buffer
# On success it extracts out relevant information (table information, key offsets, and the DB BLob)
def _read_keychain_to_buffer(self):
try:
with open(self.filepath, 'rb') as fp:
self.kc_buffer = fp.read()
if self.kc_buffer:
self.header = _APPL_DB_HEADER(self.kc_buffer[:_APPL_DB_HEADER.STRUCT.size])
self.schema_info, self.table_list = self._get_schema_info(self.header.SchemaOffset)
self.table_metadata, self.record_list = self._get_table(self.table_list[0])
self.table_count, self.table_enum = self._get_table_name_to_list(self.record_list, self.table_list)
self.symmetric_key_offset = self.table_list[self.table_enum[CSSM_DL_DB_RECORD_METADATA]]
self.base_addr = _APPL_DB_HEADER.STRUCT.size + self.symmetric_key_offset + 0x38
self.dbblob = _DB_BLOB(self.kc_buffer[self.base_addr:self.base_addr + _DB_BLOB.STRUCT.size])
except OSError as e:
self.logger.critical("Unable to read keychain: %s" % e)
# Simple check to make sure the keychain we're looking at is valid.
# A valid keychain begins with "kych"
def _is_valid_keychain(self):
if self.kc_buffer[0:4].decode() != Chainbreaker.KEYCHAIN_SIGNATURE:
return False
return True
# When the keychain is successfully decrypted ("unlocked"), we can obtain a list of encryption keys
# used to encrypt individual records, indexed off of the SSGB label.
def _generate_key_list(self):
table_meta_data, symmetric_key_list = self._get_table_from_type(CSSM_DL_DB_RECORD_SYMMETRIC_KEY)
for symmetric_key_record in symmetric_key_list:
keyblob, ciphertext, iv, return_value = self._get_keyblob_record(symmetric_key_record)
if return_value == 0:
password = Chainbreaker.keyblob_decryption(ciphertext, iv, self.db_key)
if password != '':
self.key_list[keyblob] = password
return len(self.key_list)
# Returns basic schema (table count, size) and a list of the tables from the Keychain file.
def _get_schema_info(self, offset):
table_list = []
schema_info = _APPL_DB_SCHEMA(self.kc_buffer[offset:offset + _APPL_DB_SCHEMA.STRUCT.size])
for i in range(schema_info.TableCount):
base_addr = _APPL_DB_HEADER.STRUCT.size + _APPL_DB_SCHEMA.STRUCT.size
table_list.append(_TABLE_ID(self.kc_buffer[base_addr + (Chainbreaker.ATOM_SIZE * i):base_addr + (
Chainbreaker.ATOM_SIZE * i) + Chainbreaker.ATOM_SIZE]).Value)
return schema_info, table_list
# Given a table name, return the offset for the table
def _get_table_offset(self, table_name):
return self.table_list[self.table_enum[table_name]]
# Returns a table, given the AppleFileDL CSSM_DB_RECORDTYPE from schema.py
# (e.g. CSSM_DL_DB_RECORD_GENERIC_PASSWORD)
def _get_table_from_type(self, table_type):
return self._get_table(self._get_table_offset(table_type))
# Returns a both the metadata and a record list for a table, given an offset.
def _get_table(self, offset):
record_list = []
base_addr = _APPL_DB_HEADER.STRUCT.size + offset
table_metadata = _TABLE_HEADER(self.kc_buffer[base_addr:base_addr + _TABLE_HEADER.STRUCT.size])
record_offset_base = base_addr + _TABLE_HEADER.STRUCT.size
record_count = 0
offset = 0
while table_metadata.RecordCount != record_count:
record_offset = _RECORD_OFFSET(self.kc_buffer[
record_offset_base + (Chainbreaker.ATOM_SIZE * offset):record_offset_base + (
Chainbreaker.ATOM_SIZE * offset) + Chainbreaker.ATOM_SIZE]).Value
if (record_offset != 0x00) and (record_offset % 4 == 0):
record_list.append(record_offset)
record_count += 1
offset += 1
return table_metadata, record_list
# Returns a dict of table indexes keyed off of the TableId
def _get_table_name_to_list(self, record_list, table_list):
table_dict = {}
for count in range(len(record_list)):
table_metadata, generic_list = self._get_table(table_list[count])
table_dict[table_metadata.TableId] = count # extract valid table list
return len(record_list), table_dict
def _get_keyblob_record(self, record_offset):
base_addr = self._get_base_address(CSSM_DL_DB_RECORD_SYMMETRIC_KEY, record_offset)
key_blob_record_header = _KEY_BLOB_REC_HEADER(
self.kc_buffer[base_addr:base_addr + _KEY_BLOB_REC_HEADER.STRUCT.size])
record = self.kc_buffer[
base_addr + _KEY_BLOB_REC_HEADER.STRUCT.size:base_addr + key_blob_record_header.RecordSize]
key_blob_record = _KEY_BLOB(record[:+_KEY_BLOB.STRUCT.size])
if SECURE_STORAGE_GROUP != record[key_blob_record.TotalLength + 8:key_blob_record.TotalLength + 8 + 4].decode():
return '', '', '', 1
cipher_len = key_blob_record.TotalLength - key_blob_record.StartCryptoBlob
if cipher_len % Chainbreaker.BLOCKSIZE != 0:
self.logger.debug("Bad ciphertext length.")
return '', '', '', 1
cipher_text = record[key_blob_record.StartCryptoBlob:key_blob_record.TotalLength]
# match data, keyblob_ciphertext, Initial Vector, success
return record[
key_blob_record.TotalLength + 8:key_blob_record.TotalLength + 8 + 20], cipher_text, key_blob_record.IV, 0
# Get a timestamp from the keychain buffer
def _get_keychain_time(self, base_addr, pcol):
if pcol <= 0:
return ''
else:
return _KEYCHAIN_TIME(self.kc_buffer[base_addr + pcol:base_addr + pcol + _KEYCHAIN_TIME.STRUCT.size]).Time
# Get an integer from the keychain buffer
def _get_int(self, base_addr, pcol):
if pcol <= 0:
return 0
else:
return _INT(self.kc_buffer[base_addr + pcol:base_addr + pcol + 4]).Value
# Get 4 character code from the keychain buffer
def _get_four_char_code(self, base_addr, pcol):
if pcol <= 0:
return b''
else:
return _FOUR_CHAR_CODE(self.kc_buffer[base_addr + pcol:base_addr + pcol + 4]).Value
# Get an lv from the keychain buffer
def _get_lv(self, base_addr, pcol):
if pcol <= 0:
return b''
str_length = _INT(self.kc_buffer[base_addr + pcol:base_addr + pcol + 4]).Value
# 4byte arrangement
if (str_length % 4) == 0:
real_str_len = (str_length // 4) * 4
else:
real_str_len = ((str_length // 4) + 1) * 4
try:
data = _LV(self.kc_buffer[base_addr + pcol + 4:base_addr + pcol + 4 + real_str_len], real_str_len).Value
except struct.error:
self.logger.debug('LV string length is too long.')
return b''
return data
#
# # http://opensource.apple.com/source/libsecurity_keychain/libsecurity_keychain-55044/lib/KeyItem.cpp
def _private_key_decryption(self, encryptedblob, iv):
plain = Chainbreaker._kcdecrypt(self.db_key, Chainbreaker.MAGIC_CMS_IV, 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]
revplain = plain[::-1]
# now the real key gets found. */
plain = Chainbreaker._kcdecrypt(self.db_key, 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 _generate_master_key(self, pw):
return PBKDF2(pw, bytearray(self.dbblob.Salt), 1000, Chainbreaker.KEYLEN).key
# ## find DBBlob and extract Wrapping key
def _find_wrapping_key(self, master):
# get cipher text area
ciphertext = self.kc_buffer[
self.base_addr + self.dbblob.StartCryptoBlob:self.base_addr + self.dbblob.TotalLength]
# decrypt the key
plain = Chainbreaker._kcdecrypt(master, self.dbblob.IV, ciphertext)
if plain.__len__() < Chainbreaker.KEYLEN:
return ''
dbkey = plain[:Chainbreaker.KEYLEN]
# return encrypted wrapping key
return dbkey
# Extract the Cyphertext, IV, and Salt for the keychain file, for use with offline cracking (e.g. Hashcat)
# Returns a KeychainPasswordHash object
def dump_keychain_password_hash(self):
cyphertext = hexlify(
self.kc_buffer[self.base_addr + self.dbblob.StartCryptoBlob:self.base_addr + self.dbblob.TotalLength])
iv = hexlify(self.dbblob.IV)
salt = hexlify(self.dbblob.Salt)
return self.KeychainPasswordHash(salt, iv, cyphertext)
# Given a base address and offset (ID) of a record,
def _get_appleshare_record(self, record_offset):
base_addr = self._get_base_address(CSSM_DL_DB_RECORD_APPLESHARE_PASSWORD, record_offset)
record_meta = _APPLE_SHARE_HEADER(self.kc_buffer[base_addr:base_addr + _APPLE_SHARE_HEADER.STRUCT.size])
buffer = self.kc_buffer[base_addr + _APPLE_SHARE_HEADER.STRUCT.size:base_addr + record_meta.RecordSize]
ssgp, dbkey = self._extract_ssgp_and_dbkey(record_meta, buffer)
return self.AppleshareRecord(
created=self._get_keychain_time(base_addr, record_meta.CreationDate & 0xFFFFFFFE),
last_modified=self._get_keychain_time(base_addr, record_meta.ModDate & 0xFFFFFFFE),
description=self._get_lv(base_addr, record_meta.Description & 0xFFFFFFFE),
comment=self._get_lv(base_addr, record_meta.Comment & 0xFFFFFFFE),
creator=self._get_four_char_code(base_addr, record_meta.Creator & 0xFFFFFFFE),
type=self._get_four_char_code(base_addr, record_meta.Type & 0xFFFFFFFE),
print_name=self._get_lv(base_addr, record_meta.PrintName & 0xFFFFFFFE),
alias=self._get_lv(base_addr, record_meta.Alias & 0xFFFFFFFE),
protected=self._get_lv(base_addr, record_meta.Protected & 0xFFFFFFFE),
account=self._get_lv(base_addr, record_meta.Account & 0xFFFFFFFE),
volume=self._get_lv(base_addr, record_meta.Volume & 0xFFFFFFFE),
server=self._get_lv(base_addr, record_meta.Server & 0xFFFFFFFE),
protocol_type=self._get_four_char_code(base_addr, record_meta.Protocol & 0xFFFFFFFE),
address=self._get_lv(base_addr, record_meta.Address & 0xFFFFFFFE),
signature=self._get_lv(base_addr, record_meta.Signature & 0xFFFFFFFE),
ssgp=ssgp,
dbkey=dbkey
)
def _get_private_key_record(self, record_offset):
record = self._get_key_record(self._get_table_offset(CSSM_DL_DB_RECORD_PRIVATE_KEY), record_offset)
if not self.db_key:
keyname = privatekey = Chainbreaker.KEYCHAIN_LOCKED_SIGNATURE
else:
keyname, privatekey = self._private_key_decryption(record[10], record[9])
return self.PrivateKeyRecord(
print_name=record[0].decode(), #decode
label=record[1], #decode
key_class=KEY_TYPE[record[2]],
private=record[3],
key_type=record[4],
key_size=record[5],
effective_key_size=record[6],
extracted=record[7],
cssm_type=record[8],
iv=record[9],
key=record[10],
key_name=keyname,
private_key=privatekey,
)
def _get_public_key_record(self, record_offset):
record = self._get_key_record(self._get_table_offset(CSSM_DL_DB_RECORD_PUBLIC_KEY), record_offset)
return self.PublicKeyRecord(
print_name=record[0].decode(),
label=record[1],
key_class=KEY_TYPE[record[2]],
private=record[3],
key_type=record[4],
key_size=record[5],
effective_key_size=record[6],
extracted=record[7],
cssm_type=record[8],
iv=record[9],
public_key=record[10],
)
def _get_key_record(self, table_name, record_offset): ## PUBLIC and PRIVATE KEY
base_addr = self._get_base_address(table_name, record_offset)
record_meta = _SECKEY_HEADER(self.kc_buffer[base_addr:base_addr + _SECKEY_HEADER.STRUCT.size])
key_blob = self.kc_buffer[
base_addr + _SECKEY_HEADER.STRUCT.size:base_addr + _SECKEY_HEADER.STRUCT.size + record_meta.BlobSize]
iv, key = Chainbreaker._get_encrypted_data_in_blob(key_blob)
return [self._get_lv(base_addr, record_meta.PrintName & 0xFFFFFFFE),
self._get_lv(base_addr, record_meta.Label & 0xFFFFFFFE),
self._get_int(base_addr, record_meta.KeyClass & 0xFFFFFFFE),
self._get_int(base_addr, record_meta.Private & 0xFFFFFFFE),
CSSM_ALGORITHMS[self._get_int(base_addr, record_meta.KeyType & 0xFFFFFFFE)],
self._get_int(base_addr, record_meta.KeySizeInBits & 0xFFFFFFFE),
self._get_int(base_addr, record_meta.EffectiveKeySize & 0xFFFFFFFE),
self._get_int(base_addr, record_meta.Extractable & 0xFFFFFFFE),
STD_APPLE_ADDIN_MODULE[
(self._get_lv(base_addr, record_meta.KeyCreator & 0xFFFFFFFE)).split(b'\x00')[0].decode()],
iv,
key]
def _get_x_509_record(self, record_offset):
base_addr = self._get_base_address(CSSM_DL_DB_RECORD_X509_CERTIFICATE, record_offset)
record_meta = _X509_CERT_HEADER(self.kc_buffer[base_addr:base_addr + _X509_CERT_HEADER.STRUCT.size])
return self.X509CertificateRecord(
type=self._get_int(base_addr, record_meta.CertType & 0xFFFFFFFE),
encoding=self._get_int(base_addr, record_meta.CertEncoding & 0xFFFFFFFE),
print_name=self._get_lv(base_addr, record_meta.PrintName & 0xFFFFFFFE),
alias=self._get_lv(base_addr, record_meta.Alias & 0xFFFFFFFE),
subject=self._get_lv(base_addr, record_meta.Subject & 0xFFFFFFFE),
issuer=self._get_lv(base_addr, record_meta.Issuer & 0xFFFFFFFE),
serial_number=self._get_lv(base_addr, record_meta.SerialNumber & 0xFFFFFFFE),
subject_key_identifier=self._get_lv(base_addr, record_meta.SubjectKeyIdentifier & 0xFFFFFFFE),
public_key_hash=self._get_lv(base_addr, record_meta.PublicKeyHash & 0xFFFFFFFE),
certificate=self.kc_buffer[
base_addr + _X509_CERT_HEADER.STRUCT.size:base_addr + _X509_CERT_HEADER.STRUCT.size + record_meta.CertSize]
)
def _extract_ssgp_and_dbkey(self, record_meta, buffer):
ssgp = None
dbkey = None
if record_meta.SSGPArea != 0:
ssgp = _SSGP(buffer[:record_meta.SSGPArea])
dbkey_index = ssgp.Magic + ssgp.Label
if dbkey_index in self.key_list:
dbkey = self.key_list[dbkey_index]
return ssgp, dbkey
def _get_internet_password_record(self, record_offset):
base_addr = self._get_base_address(CSSM_DL_DB_RECORD_INTERNET_PASSWORD, record_offset)
record_meta = _INTERNET_PW_HEADER(self.kc_buffer[base_addr:base_addr + _INTERNET_PW_HEADER.STRUCT.size])
buffer = self.kc_buffer[base_addr + _INTERNET_PW_HEADER.STRUCT.size:base_addr + record_meta.RecordSize]
ssgp, dbkey = self._extract_ssgp_and_dbkey(record_meta, buffer)
return self.InternetPasswordRecord(
created=self._get_keychain_time(base_addr, record_meta.CreationDate & 0xFFFFFFFE),
last_modified=self._get_keychain_time(base_addr, record_meta.ModDate & 0xFFFFFFFE),
description=self._get_lv(base_addr, record_meta.Description & 0xFFFFFFFE),
comment=self._get_lv(base_addr, record_meta.Comment & 0xFFFFFFFE),
creator=self._get_four_char_code(base_addr, record_meta.Creator & 0xFFFFFFFE),
type=self._get_four_char_code(base_addr, record_meta.Type & 0xFFFFFFFE),
print_name=self._get_lv(base_addr, record_meta.PrintName & 0xFFFFFFFE),
alias=self._get_lv(base_addr, record_meta.Alias & 0xFFFFFFFE),
protected=self._get_lv(base_addr, record_meta.Protected & 0xFFFFFFFE),
account=self._get_lv(base_addr, record_meta.Account & 0xFFFFFFFE),
security_domain=self._get_lv(base_addr, record_meta.SecurityDomain & 0xFFFFFFFE),
server=self._get_lv(base_addr, record_meta.Server & 0xFFFFFFFE),
protocol_type=self._get_four_char_code(base_addr, record_meta.Protocol & 0xFFFFFFFE),
auth_type=self._get_lv(base_addr, record_meta.AuthType & 0xFFFFFFFE),
port=self._get_int(base_addr, record_meta.Port & 0xFFFFFFFE),
path=self._get_lv(base_addr, record_meta.Path & 0xFFFFFFFE),
ssgp=ssgp,
dbkey=dbkey
)
def _get_generic_password_record(self, record_offset):
base_addr = self._get_base_address(CSSM_DL_DB_RECORD_GENERIC_PASSWORD, record_offset)
record_meta = _GENERIC_PW_HEADER(self.kc_buffer[base_addr:base_addr + _GENERIC_PW_HEADER.STRUCT.size])
buffer = self.kc_buffer[
base_addr + _GENERIC_PW_HEADER.STRUCT.size:base_addr + record_meta.RecordSize]
ssgp, dbkey = self._extract_ssgp_and_dbkey(record_meta, buffer)
return self.GenericPasswordRecord(
created=self._get_keychain_time(base_addr, record_meta.CreationDate & 0xFFFFFFFE),
last_modified=self._get_keychain_time(base_addr, record_meta.ModDate & 0xFFFFFFFE),
description=self._get_lv(base_addr, record_meta.Description & 0xFFFFFFFE),
creator=self._get_four_char_code(base_addr, record_meta.Creator & 0xFFFFFFFE),
type=self._get_four_char_code(base_addr, record_meta.Type & 0xFFFFFFFE),
print_name=self._get_lv(base_addr, record_meta.PrintName & 0xFFFFFFFE),
alias=self._get_lv(base_addr, record_meta.Alias & 0xFFFFFFFE),
account=self._get_lv(base_addr, record_meta.Account & 0xFFFFFFFE),
service=self._get_lv(base_addr, record_meta.Service & 0xFFFFFFFE),
ssgp=ssgp,
dbkey=dbkey)
return record
def _get_base_address(self, table_name, offset=None):
# if table_name >= 0x4000 and table_name < 0x5000:
# table_name = 15
# if table_name >= 0x5000 and table_name < 0x6000:
# table_name = 16
if table_name >= 0x3000 and table_name < 0x4e20:
table_name = 15
if table_name >= 0x4e20 and table_name < 0x8000:
table_name = 16
# print("TABLE_NAME: ", table_name) use this for debugging
# if table_name == 19984:
# table_name = 15
# if table_name == 20360:
# table_name = 16
# if table_name == 23972:
# table_name = 16
# if table_name == 30912:
# table_name = 16
base_address = _APPL_DB_HEADER.STRUCT.size + self._get_table_offset(table_name)
if offset:
base_address += offset
return base_address
@property
def filepath(self):
return self._filepath
@filepath.setter
def filepath(self, value):
self._filepath = value
if self._filepath:
self._read_keychain_to_buffer()
@property
def unlock_password(self):
return self._unlock_password
@unlock_password.setter
def unlock_password(self, unlock_password):
if isinstance(unlock_password, str):
unlock_password = unlock_password.encode()
self._unlock_password = unlock_password
if self._unlock_password:
master_key = self._generate_master_key(self._unlock_password)
self.db_key = self._find_wrapping_key(master_key)
@property
def unlock_key(self):
return self._unlock_key
@unlock_key.setter
def unlock_key(self, unlock_key):
self._unlock_key = unlock_key
if self._unlock_key:
self.db_key = self._find_wrapping_key(unhexlify(self._unlock_key))
@property
def unlock_file(self):
return self._unlock_file
@unlock_file.setter
def unlock_file(self, filepath):
self._unlock_file = filepath
if self._unlock_file:
try:
with open(self._unlock_file, mode='rb') as uf:
file_content = uf.read()
unlock_key_blob = _UNLOCK_BLOB(file_content)
self.db_key = self._find_wrapping_key(unlock_key_blob.MasterKey)
except OSError:
logger.warning("Unable to read unlock file: %s" % self._unlock_file)
@property
def db_key(self):
return self._db_key
@db_key.setter
def db_key(self, key):
self._db_key = key
if self._db_key:
# Even after finding a db_key, we need to try and load the key list.
# If we don't find any keys, but we do find a db_key, then we've likely
# found a hash collision
if self._generate_key_list() > 0:
self.locked = False
# SOURCE : extractkeychain.py
@staticmethod
def _kcdecrypt(key, iv, data):
logger = logging.getLogger('Chainbreaker')
if len(data) == 0:
logger.debug("Encrypted data is 0.")
return ''
if len(data) % Chainbreaker.BLOCKSIZE != 0:
return ''
cipher = TripleDES(key, CBC, bytearray(iv))
plain = cipher.decrypt(data)
# now check padding
pad = plain[-1]
if pad > 8:
logger.debug("Bad padding byte. Keychain password might be incorrect.")
return ''
for z in plain[-pad:]:
if z != pad:
logger.debug("Bad padding byte. Keychain password might be incorrect.")
return ''
plain = plain[:-pad]
return plain
@staticmethod
def _get_encrypted_data_in_blob(blob_buffer):
key_blob = _KEY_BLOB(blob_buffer[:_KEY_BLOB.STRUCT.size])
if key_blob.CommonBlob.Magic != _KEY_BLOB.COMMON_BLOB_MAGIC:
return '', ''
key_data = blob_buffer[key_blob.StartCryptoBlob:key_blob.TotalLength]
return key_blob.IV, key_data # IV, Encrypted Data
# ## 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 _ssgp_decryption(self, ssgp, dbkey):
# return Chainbreaker._kcdecrypt(dbkey, _SSGP(ssgp).IV, ssgp[_SSGP.STRUCT.size:])
# 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
@staticmethod
def keyblob_decryption(encryptedblob, iv, dbkey):
logger = logging.getLogger('Chainbreaker')
# magicCmsIV = unhexlify('4adda22c79e82105')
plain = Chainbreaker._kcdecrypt(dbkey, Chainbreaker.MAGIC_CMS_IV, encryptedblob)
if plain.__len__() == 0:
return ''
# now we handle the unwrapping. we need to take the first 32 bytes,
# and reverse them.
# revplain = b''
# for i in range(32):
# revplain += plain[31 - i]
revplain = (plain[:32])[::-1]
# now the real key gets found. */
plain = Chainbreaker._kcdecrypt(dbkey, iv, revplain)
keyblob = plain[4:]
if len(keyblob) != Chainbreaker.KEYLEN:
logger.debug("Decrypted key length is not valid")
return ''
return keyblob
class KeychainRecord(object):
def __init__(self):
self.logger = logging.getLogger('Chainbreaker')
def write_to_disk(self, output_directory):
# self.exportable contains the content we should write to disk. If it isn't implemented we can't
# then writing to disk via this method isn't currently supported.
try:
export_content = self.exportable
except NotImplementedError:
self.logger.warning('Attempted to export a non-exportable record.')
return False
# Create out export directory if it doesn't exist.
if not os.path.exists(output_directory):
try:
os.makedirs(output_directory)
except OSError:
self.logger.critical('Unable to create export directory: %s' % output_directory)
# Generate our filepath, making sure the file doesn't already exist. If it does,
# add a number, e.g. PrivateKey.1.key
file_name = self.FileName + self.FileExt
iteration = 1
while os.path.exists(os.path.join(output_directory, file_name)):
file_name = "%s.%s%s" % (self.FileName, iteration, self.FileExt)
iteration += 1
file_path = os.path.join(output_directory, file_name)
# Finish exporting the record.
try:
with open(file_path, 'wb') as fp:
self.logger.info('\t [-] Exported: %s' % file_path)
if isinstance(export_content, str):
export_content = export_content.encode()
fp.write(export_content)
return True
except OSError as e:
self.logger.critical('Exception while attempting to export %s: %s' % (file_path, e))
@property
def FileName(self):
return str(uuid.uuid4())
@property
def FileExt(self):
return '.txt'
class KeychainPasswordHash(KeychainRecord):
KEYCHAIN_PASSWORD_HASH_FORMAT = "$keychain$*%s*%s*%s"
def __init__(self, salt, iv, cyphertext):
self.salt = salt
self.iv = iv
self.cypher_text = cyphertext
Chainbreaker.KeychainRecord.__init__(self)
def __str__(self):
return Chainbreaker.KeychainPasswordHash.KEYCHAIN_PASSWORD_HASH_FORMAT % (
self.salt.decode('utf-8'), self.iv.decode('utf-8'), self.cypher_text.decode('utf-8'))
@property
def exportable(self):
return self.__str__()
@property
def FileName(self):
return "keychain_password_hash"
class PublicKeyRecord(KeychainRecord):
def __init__(self, print_name=None, label=None, key_class=None, private=None, key_type=None, key_size=None,
effective_key_size=None, extracted=None, cssm_type=None, public_key=None, iv=None, key=None):
self.PrintName = print_name
self.Label = label
self.KeyClass = key_class
self.Private = private
self.KeyType = key_type
self.KeySize = key_size
self.EffectiveKeySize = effective_key_size
self.Extracted = extracted
self.CSSMType = cssm_type
self.PublicKey = public_key
self.IV = iv
self.Key = key
Chainbreaker.KeychainRecord.__init__(self)
def __str__(self):
output = '[+] Public Key\n'
output += ' [-] Print Name: %s\n' % self.PrintName
# output += ' [-] Label: %s\n' % self.Label
output += ' [-] Key Class: %s\n' % self.KeyClass
output += ' [-] Private: %s\n' % self.Private
output += ' [-] Key Type: %s\n' % self.KeyType
output += ' [-] Key Size: %s\n' % self.KeySize
output += ' [-] Effective Key Size: %s\n' % self.EffectiveKeySize
output += ' [-] Extracted: %s\n' % self.Extracted
output += ' [-] CSSM Type: %s\n' % self.CSSMType
output += ' [-] Base64 Encoded Public Key: %s\n' % base64.b64encode(self.PublicKey)
return output
@property
def exportable(self):
return self.PublicKey
@property
def FileName(self):
return "".join(x for x in self.PrintName if x.isalnum())
@property
def FileExt(self):
return '.pub'
class PrivateKeyRecord(KeychainRecord):
def __init__(self, print_name=None, label=None, key_class=None, private=None, key_type=None, key_size=None,
effective_key_size=None, extracted=None, cssm_type=None, key_name=None, private_key=None, iv=None,
key=None):
self.PrintName = print_name
self.Label = label
self.KeyClass = key_class
self.Private = private
self.KeyType = key_type
self.KeySize = key_size
self.EffectiveKeySize = effective_key_size
self.Extracted = extracted
self.CSSMType = cssm_type
self.KeyName = key_name
self.PrivateKey = private_key
self.IV = iv
self.Key = key
Chainbreaker.KeychainRecord.__init__(self)
def __str__(self):
output = '[+] Private Key\n'
output += ' [-] Print Name: %s\n' % self.PrintName
# output += ' [-] Label: %s\n' % self.Label
output += ' [-] Key Class: %s\n' % self.KeyClass
# output += ' [-] Private: %s\n' % self.Private
output += ' [-] Key Type: %s\n' % self.KeyType
output += ' [-] Key Size: %s\n' % self.KeySize
output += ' [-] Effective Key Size: %s\n' % self.EffectiveKeySize
# output += ' [-] Extracted: %s\n' % self.Extracted
output += ' [-] CSSM Type: %s\n' % self.CSSMType
# output += ' [-] KeyName: %s\n' % self.KeyName
output += ' [-] Base64 Encoded PrivateKey: '
if self.PrivateKey == Chainbreaker.KEYCHAIN_LOCKED_SIGNATURE:
output += "%s\n" % Chainbreaker.KEYCHAIN_LOCKED_SIGNATURE
else:
output += "%s\n" % base64.b64encode(self.PrivateKey)
return output
@property
def exportable(self):
return self.PrivateKey
@property
def FileName(self):
return "".join(x for x in self.PrintName if x.isalnum())
@property
def FileExt(self):
return '.key'
class X509CertificateRecord(KeychainRecord):
def __init__(self, type=None, encoding=None, print_name=None, alias=None, subject=None, issuer=None,
serial_number=None, subject_key_identifier=None, public_key_hash=None, certificate=None):
self.Type = type
self.Encoding = encoding
self.PrintName = print_name
self.Alias = alias
self.Subject = subject
self.Issuer = issuer
self.Serial_Number = serial_number
self.Subject_Key_Identifier = subject_key_identifier
self.Public_Key_Hash = public_key_hash
self.Certificate = certificate
Chainbreaker.KeychainRecord.__init__(self)
def __str__(self):
output = '[+] X509 Certificate\n'
# output += " [-] Type: %s\n" % self.Type
# output += " [-] Encoding: %s\n" % self.Encoding
output += " [-] Print Name: %s\n" % self.PrintName.decode()
# output += " [-] Alias: %s\n" % self.Alias
# output += " [-] Subject: %s\n" % self.Subject
# output += " [-] Issuer: %s\n" % self.Issuer
# output += " [-] Serial Number: %s\n" % self.Serial_Number
# output += " [-] Subject Key Identifier: %s\n" % self.Subject_Key_Identifier
# output += " [-] Public Key Hash: %s\n" % self.Public_Key_Hash
output += " [-] Certificate: %s\n" % base64.b64encode(self.Certificate).decode()
return output
@property
def exportable(self):
return self.Certificate
@property
def FileName(self):
return "".join(x for x in self.PrintName.decode() if x.isalnum())
@property
def FileExt(self):
return '.crt'
class SSGBEncryptedRecord(KeychainRecord):
def __init__(self):
self._password = None
self.locked = True
self.password_b64_encoded = False
Chainbreaker.KeychainRecord.__init__(self)
def decrypt_password(self):
try:
if self.SSGP and self.DBKey:
self._password = Chainbreaker._kcdecrypt(self.DBKey, self.SSGP.IV, self.SSGP.EncryptedPassword)
if not all(c in printable_chars for c in self._password):
self._password = base64.b64encode(self._password)
self.password_b64_encoded = True
self.locked = False
except KeyError:
if not self._password:
self.locked = True
self._password = None
return self._password
def get_password_output_str(self):
password = self.Password
if self.password_b64_encoded:
if isinstance(password, str):
return ' [-] Base64 Encoded Password: {}\n'.format(password)
return ' [-] Base64 Encoded Password: {}\n'.format(password.decode())
else:
if isinstance(password, str):
return ' [-] Password: {}\n'.format(password)
return ' [-] Password: {}\n'.format(password.decode())
@property
def Password(self):
if not self._password:
self.decrypt_password()
if self.locked:
self._password = Chainbreaker.KEYCHAIN_LOCKED_SIGNATURE
return self._password
@property
def exportable(self):
return self.__str__()
@property
def FileName(self):
return "".join(x for x in self.PrintName.decode() if x.isalnum())
@property
def FileExt(self):
return '.txt'
class GenericPasswordRecord(SSGBEncryptedRecord):
def __init__(self, created=None, last_modified=None, description=None, creator=None, type=None, print_name=None,
alias=None, account=None, service=None, key=None, ssgp=None, dbkey=None):
self.Created = created
self.LastModified = last_modified
self.Description = description
self.Creator = creator
self.Type = type
self.PrintName = print_name
self.Alias = alias
self.Account = account