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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 hmac
import hashlib
from .rawreg import *
from ..addrspace import HiveFileAddressSpace
from .hashdump import get_bootkey
from .lsasecrets import get_secret_by_name, get_lsa_key
from struct import unpack
from foreign.client_handling.lazagne.config.crypto.pyaes.aes import AESModeOfOperationCBC
from foreign.client_handling.lazagne.config.crypto.rc4 import RC4
AES_BLOCK_SIZE = 16
def get_nlkm(secaddr, lsakey, vista):
return get_secret_by_name(secaddr, 'NL$KM', lsakey, vista)
def decrypt_hash(edata, nlkm, ch):
hmac_md5 = hmac.new(nlkm, ch, hashlib.md5)
rc4key = hmac_md5.digest()
rc4 = RC4(rc4key)
data = rc4.encrypt(edata)
return data
def decrypt_hash_vista(edata, nlkm, ch):
"""
Based on code from http://lab.mediaservice.net/code/cachedump.rb
"""
aes = AESModeOfOperationCBC(nlkm[16:32], iv=ch)
out = ""
for i in range(0, len(edata), 16):
buf = edata[i:i+16]
if len(buf) < 16:
buf += (16 - len(buf)) * "\00"
out += b"".join([aes.decrypt(buf[i:i + AES_BLOCK_SIZE]) for i in range(0, len(buf), AES_BLOCK_SIZE)])
return out
def parse_cache_entry(cache_data):
(uname_len, domain_len) = unpack("<HH", cache_data[:4])
(domain_name_len,) = unpack("<H", cache_data[60:62])
ch = cache_data[64:80]
enc_data = cache_data[96:]
return uname_len, domain_len, domain_name_len, enc_data, ch
def parse_decrypted_cache(dec_data, uname_len, domain_len, domain_name_len):
uname_off = 72
pad = 2 * ((uname_len / 2) % 2)
domain_off = uname_off + uname_len + pad
pad = 2 * ((domain_len / 2) % 2)
domain_name_off = domain_off + domain_len + pad
data_hash = dec_data[:0x10]
username = dec_data[uname_off:uname_off+uname_len]
username = username.decode('utf-16-le', errors='ignore')
domain = dec_data[domain_off:domain_off+domain_len]
domain = domain.decode('utf-16-le', errors='ignore')
domain_name = dec_data[domain_name_off:domain_name_off+domain_name_len]
domain_name = domain_name.decode('utf-16-le', errors='ignore')
return username, domain, domain_name, data_hash
def dump_hashes(sysaddr, secaddr, vista):
bootkey = get_bootkey(sysaddr)
if not bootkey:
return []
lsakey = get_lsa_key(secaddr, bootkey, vista)
if not lsakey:
return []
nlkm = get_nlkm(secaddr, lsakey, vista)
if not nlkm:
return []
root = get_root(secaddr)
if not root:
return []
cache = open_key(root, ["Cache"])
if not cache:
return []
hashes = []
for v in values(cache):
if v.Name == "NL$Control":
continue
data = v.space.read(v.Data.value, v.DataLength.value)
(uname_len, domain_len, domain_name_len, enc_data, ch) = parse_cache_entry(data)
# Skip if nothing in this cache entry
if uname_len == 0:
continue
if vista:
dec_data = decrypt_hash_vista(enc_data, nlkm, ch)
else:
dec_data = decrypt_hash(enc_data, nlkm, ch)
(username, domain, domain_name, hash) = parse_decrypted_cache(dec_data, uname_len, domain_len, domain_name_len)
hashes.append((username, domain, domain_name, hash))
return hashes
def dump_file_hashes(syshive_fname, sechive_fname, vista):
sysaddr = HiveFileAddressSpace(syshive_fname)
secaddr = HiveFileAddressSpace(sechive_fname)
results = []
for (u, d, dn, hash) in dump_hashes(sysaddr, secaddr, vista):
results.append("%s:%s:%s:%s" % (u.lower(), hash.encode('hex'), d.lower(), dn.lower()))
return results
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