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# This file is part of creddump.
#
# creddump 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 3 of the License, or
# (at your option) any later version.
#
# creddump 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 creddump. If not, see <http://www.gnu.org/licenses/>.
"""
@author: Brendan Dolan-Gavitt
@license: GNU General Public License 2.0 or later
@contact: bdolangavitt@wesleyan.edu
"""
import hashlib
import os
from .rawreg import *
from ..addrspace import HiveFileAddressSpace
from .hashdump import get_bootkey, str_to_key
from foreign.client_handling.lazagne.config.crypto.rc4 import RC4
from foreign.client_handling.lazagne.config.crypto.pyDes import des, ECB
from foreign.client_handling.lazagne.config.crypto.pyaes.aes import AESModeOfOperationCBC
def get_lsa_key(secaddr, bootkey, vista):
root = get_root(secaddr)
if not root:
return None
if vista:
enc_reg_key = open_key(root, [b"Policy", b"PolEKList"])
else:
enc_reg_key = open_key(root, [b"Policy", b"PolSecretEncryptionKey"])
if not enc_reg_key:
return None
enc_reg_value = enc_reg_key.ValueList.List[0]
if not enc_reg_value:
return None
obf_lsa_key = secaddr.read(enc_reg_value.Data.value, enc_reg_value.DataLength.value)
if not obf_lsa_key:
return None
if not vista:
md5 = hashlib.md5()
md5.update(bootkey)
for i in range(1000):
md5.update(obf_lsa_key[60:76])
rc4key = md5.digest()
rc4 = RC4(rc4key)
lsa_key = rc4.encrypt(obf_lsa_key[12:60])
lsa_key = lsa_key[0x10:0x20]
else:
lsa_key = decrypt_aes(obf_lsa_key, bootkey)
lsa_key = lsa_key[68:100]
return lsa_key
def decrypt_secret(secret, key):
"""Python implementation of SystemFunction005.
Decrypts a block of data with DES using given key.
Note that key can be longer than 7 bytes."""
decrypted_data = b''
j = 0 # key index
for i in range(0, len(secret), 8):
enc_block = secret[i:i + 8]
block_key = key[j:j + 7]
des_key = str_to_key(block_key)
crypter = des(des_key, ECB)
try:
decrypted_data += crypter.decrypt(enc_block)
except Exception:
continue
j += 7
if len(key[j:j + 7]) < 7:
j = len(key[j:j + 7])
(dec_data_len,) = unpack("<L", decrypted_data[:4])
return decrypted_data[8:8 + dec_data_len]
def decrypt_aes(secret, key):
sha = hashlib.sha256()
sha.update(key)
for _i in range(1, 1000 + 1):
sha.update(secret[28:60])
aeskey = sha.digest()
data = b""
for i in range(60, len(secret), 16):
aes = AESModeOfOperationCBC(aeskey, iv="\x00" * 16)
buf = secret[i: i + 16]
if len(buf) < 16:
buf += (16 - len(buf)) * "\00"
data += aes.decrypt(buf)
return data
def get_secret_by_name(secaddr, name, lsakey, vista):
root = get_root(secaddr)
if not root:
return None
enc_secret_key = open_key(root, [b"Policy", b"Secrets", name, b"CurrVal"])
if not enc_secret_key:
return None
enc_secret_value = enc_secret_key.ValueList.List[0]
if not enc_secret_value:
return None
enc_secret = secaddr.read(enc_secret_value.Data.value, enc_secret_value.DataLength.value)
if not enc_secret:
return None
if vista:
secret = decrypt_aes(enc_secret, lsakey)
else:
secret = decrypt_secret(enc_secret[0xC:], lsakey)
return secret
def get_secrets(sysaddr, secaddr, vista):
root = get_root(secaddr)
if not root:
return None
bootkey = get_bootkey(sysaddr)
lsakey = get_lsa_key(secaddr, bootkey, vista)
secrets_key = open_key(root, [b"Policy", b"Secrets"])
if not secrets_key:
return None
secrets = {}
for key in subkeys(secrets_key):
sec_val_key = open_key(key, [b"CurrVal"])
if not sec_val_key:
continue
enc_secret_value = sec_val_key.ValueList.List[0]
if not enc_secret_value:
continue
enc_secret = secaddr.read(enc_secret_value.Data.value, enc_secret_value.DataLength.value)
if not enc_secret:
continue
if vista:
secret = decrypt_aes(enc_secret, lsakey)
else:
secret = decrypt_secret(enc_secret[0xC:], lsakey)
secrets[key.Name] = secret
return secrets
def get_file_secrets(sysfile, secfile, vista):
if not os.path.isfile(sysfile) or not os.path.isfile(secfile):
return
sysaddr = HiveFileAddressSpace(sysfile)
secaddr = HiveFileAddressSpace(secfile)
return get_secrets(sysaddr, secaddr, vista)
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