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#!/usr/bin/env python3
# Unix SMB/CIFS implementation.
# Copyright (C) Stefan Metzmacher 2020
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
#
import sys
import os
sys.path.insert(0, 'bin/python')
os.environ['PYTHONUNBUFFERED'] = '1'
import ldb
from samba import generate_random_password, net
from samba.dcerpc import drsuapi, misc
from samba.tests.krb5.kdc_base_test import KDCBaseTest
global_asn1_print = False
global_hexdump = False
class NtHashTests(KDCBaseTest):
def setUp(self):
super().setUp()
self.do_asn1_print = global_asn1_print
self.do_hexdump = global_hexdump
def _check_nt_hash(self, dn, history_len):
expect_nt_hash = bool(int(os.environ.get('EXPECT_NT_HASH', '1')))
samdb = self.get_samdb()
admin_creds = self.get_admin_creds()
bind, identifier, attributes = self.get_secrets(
dn,
destination_dsa_guid=misc.GUID(samdb.get_ntds_GUID()),
source_dsa_invocation_id=misc.GUID())
rid = identifier.sid.split()[1]
net_ctx = net.Net(admin_creds)
def num_hashes(attr):
if attr.value_ctr.values is None:
return 0
net_ctx.replicate_decrypt(bind, attr, rid)
length = sum(len(value.blob) for value in attr.value_ctr.values)
self.assertEqual(0, length & 0xf)
return length // 16
def is_unicodePwd(attr):
return attr.attid == drsuapi.DRSUAPI_ATTID_unicodePwd
def is_ntPwdHistory(attr):
return attr.attid == drsuapi.DRSUAPI_ATTID_ntPwdHistory
unicode_pwd_count = sum(attr.value_ctr.num_values
for attr in filter(is_unicodePwd, attributes))
nt_history_count = sum(num_hashes(attr)
for attr in filter(is_ntPwdHistory, attributes))
if expect_nt_hash:
self.assertEqual(1, unicode_pwd_count,
'expected to find NT hash')
else:
self.assertEqual(0, unicode_pwd_count,
'got unexpected NT hash')
if expect_nt_hash:
self.assertEqual(history_len, nt_history_count,
'expected to find NT password history')
else:
self.assertEqual(0, nt_history_count,
'got unexpected NT password history')
# Test that the NT hash and its history is not generated or stored for an
# account when we disable NTLM authentication.
def test_nt_hash(self):
samdb = self.get_samdb()
user_name = self.get_new_username()
client_creds, client_dn = self.create_account(
samdb, user_name,
account_type=KDCBaseTest.AccountType.USER)
self._check_nt_hash(client_dn, history_len=1)
# Change the password and check that the NT hash is still not present.
# Get the old "minPwdAge"
minPwdAge = samdb.get_minPwdAge()
# Reset the "minPwdAge" as it was before
self.addCleanup(samdb.set_minPwdAge, minPwdAge)
# Set it temporarily to '0'
samdb.set_minPwdAge('0')
old_utf16pw = f'"{client_creds.get_password()}"'.encode('utf-16-le')
history_len = 3
for _ in range(history_len - 1):
password = generate_random_password(32, 32)
utf16pw = f'"{password}"'.encode('utf-16-le')
msg = ldb.Message(ldb.Dn(samdb, client_dn))
msg['0'] = ldb.MessageElement(old_utf16pw,
ldb.FLAG_MOD_DELETE,
'unicodePwd')
msg['1'] = ldb.MessageElement(utf16pw,
ldb.FLAG_MOD_ADD,
'unicodePwd')
samdb.modify(msg)
old_utf16pw = utf16pw
self._check_nt_hash(client_dn, history_len)
if __name__ == '__main__':
global_asn1_print = False
global_hexdump = False
import unittest
unittest.main()
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