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#!/usr/bin/env python3
# Unix SMB/CIFS implementation.
# Copyright (C) Stefan Metzmacher 2020
# Copyright (C) 2021 Catalyst.Net Ltd
#
# 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.tests import delete_force
import samba.tests.krb5.kcrypto as kcrypto
from samba.tests.krb5.kdc_base_test import KDCBaseTest
from samba.tests.krb5.rfc4120_constants import (
AES256_CTS_HMAC_SHA1_96,
ARCFOUR_HMAC_MD5,
KDC_ERR_TGT_REVOKED,
NT_PRINCIPAL,
)
global_asn1_print = False
global_hexdump = False
class AliasTests(KDCBaseTest):
def test_dc_alias_rename(self):
self._run_dc_alias(action='rename')
def test_dc_alias_delete(self):
self._run_dc_alias(action='delete')
def _run_dc_alias(self, action=None):
target_creds = self.get_dc_creds()
target_name = target_creds.get_username()[:-1]
self._run_alias(target_name, lambda: target_creds, action=action)
def test_create_alias_rename(self):
self._run_create_alias(action='rename')
def test_create_alias_delete(self):
self._run_create_alias(action='delete')
def _run_create_alias(self, action=None):
target_name = self.get_new_username()
def create_target():
samdb = self.get_samdb()
realm = samdb.domain_dns_name().lower()
hostname = f'{target_name}.{realm}'
spn = f'ldap/{hostname}'
details = {
'dNSHostName': hostname
}
creds, fn = self.create_account(
samdb,
target_name,
account_type=self.AccountType.COMPUTER,
spn=spn,
additional_details=details)
return creds
self._run_alias(target_name, create_target, action=action)
def _run_alias(self, target_name, target_creds_fn, action=None):
samdb = self.get_samdb()
mach_name = self.get_new_username()
# Create a machine account.
mach_creds, mach_dn = self.create_account(
samdb, mach_name, account_type=self.AccountType.COMPUTER)
self.addCleanup(delete_force, samdb, mach_dn)
mach_sid = self.get_objectSid(samdb, mach_dn)
realm = mach_creds.get_realm()
# The account salt doesn't change when the account is renamed.
old_salt = mach_creds.get_salt()
mach_creds.set_forced_salt(old_salt)
# Rename the account to alias with the target account.
msg = ldb.Message(ldb.Dn(samdb, mach_dn))
msg['sAMAccountName'] = ldb.MessageElement(target_name,
ldb.FLAG_MOD_REPLACE,
'sAMAccountName')
samdb.modify(msg)
mach_creds.set_username(target_name)
# Get a TGT for the machine account.
tgt = self.get_tgt(mach_creds, kdc_options='0', fresh=True)
# Check the PAC.
pac_data = self.get_pac_data(tgt.ticket_private['authorization-data'])
upn = f'{target_name}@{realm.lower()}'
self.assertEqual(target_name, str(pac_data.account_name))
self.assertEqual(mach_sid, pac_data.account_sid)
self.assertEqual(target_name, pac_data.logon_name)
self.assertEqual(upn, pac_data.upn)
self.assertEqual(realm, pac_data.domain_name)
# Rename or delete the machine account.
if action == 'rename':
mach_name2 = self.get_new_username()
msg = ldb.Message(ldb.Dn(samdb, mach_dn))
msg['sAMAccountName'] = ldb.MessageElement(mach_name2,
ldb.FLAG_MOD_REPLACE,
'sAMAccountName')
samdb.modify(msg)
elif action == 'delete':
samdb.delete(mach_dn)
else:
self.fail(action)
# Get the credentials for the target account.
target_creds = target_creds_fn()
# Look up the DNS host name of the target account.
target_dn = target_creds.get_dn()
res = samdb.search(target_dn,
scope=ldb.SCOPE_BASE,
attrs=['dNSHostName'])
target_hostname = str(res[0].get('dNSHostName', idx=0))
sname = self.PrincipalName_create(name_type=NT_PRINCIPAL,
names=['ldap', target_hostname])
target_cname = self.PrincipalName_create(name_type=NT_PRINCIPAL,
names=[target_name])
target_decryption_key = self.TicketDecryptionKey_from_creds(
target_creds)
authenticator_subkey = self.RandomKey(kcrypto.Enctype.AES256)
etypes = (AES256_CTS_HMAC_SHA1_96, ARCFOUR_HMAC_MD5)
def generate_s4u2self_padata(_kdc_exchange_dict,
_callback_dict,
req_body):
padata = self.PA_S4U2Self_create(name=target_cname,
realm=realm,
tgt_session_key=tgt.session_key,
ctype=None)
return [padata], req_body
expected_error_mode = KDC_ERR_TGT_REVOKED
# Make a request using S4U2Self. The request should fail.
kdc_exchange_dict = self.tgs_exchange_dict(
expected_crealm=realm,
expected_cname=target_cname,
expected_srealm=realm,
expected_sname=sname,
ticket_decryption_key=target_decryption_key,
generate_padata_fn=generate_s4u2self_padata,
expected_error_mode=expected_error_mode,
check_error_fn=self.generic_check_kdc_error,
check_kdc_private_fn=self.generic_check_kdc_private,
tgt=tgt,
authenticator_subkey=authenticator_subkey,
kdc_options='0',
expect_pac=True,
expect_edata=False)
rep = self._generic_kdc_exchange(kdc_exchange_dict,
cname=None,
realm=realm,
sname=sname,
etypes=etypes)
self.check_error_rep(rep, expected_error_mode)
if __name__ == '__main__':
global_asn1_print = False
global_hexdump = False
import unittest
unittest.main()
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