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#!/usr/bin/env python3
# Unix SMB/CIFS implementation.
# Copyright (C) Stefan Metzmacher 2020
# Copyright (C) 2020 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 os
import sys
from samba.tests import DynamicTestCase
import ldb
from samba.tests.krb5.kdc_base_test import KDCBaseTest
from samba.tests.krb5.raw_testcase import KerberosCredentials
from samba.tests.krb5.rfc4120_constants import (
AES256_CTS_HMAC_SHA1_96,
ARCFOUR_HMAC_MD5,
KDC_ERR_S_PRINCIPAL_UNKNOWN,
NT_PRINCIPAL,
)
sys.path.insert(0, "bin/python")
os.environ["PYTHONUNBUFFERED"] = "1"
global_asn1_print = False
global_hexdump = False
@DynamicTestCase
class SpnTests(KDCBaseTest):
test_account_types = {
'computer': KDCBaseTest.AccountType.COMPUTER,
'server': KDCBaseTest.AccountType.SERVER,
'rodc': KDCBaseTest.AccountType.RODC
}
test_spns = {
'2_part': 'ldap/{{account}}',
'3_part_our_domain': 'ldap/{{account}}/{netbios_domain_name}',
'3_part_our_realm': 'ldap/{{account}}/{dns_domain_name}',
'3_part_not_our_realm': 'ldap/{{account}}/test',
'3_part_instance': 'ldap/{{account}}:test/{dns_domain_name}'
}
@classmethod
def setUpClass(cls):
super().setUpClass()
cls._mock_rodc_creds = None
@classmethod
def setUpDynamicTestCases(cls):
for account_type_name, account_type in cls.test_account_types.items():
for spn_name, spn in cls.test_spns.items():
tname = f'{spn_name}_spn_{account_type_name}'
targs = (account_type, spn)
cls.generate_dynamic_test('test_spn', tname, *targs)
def _test_spn_with_args(self, account_type, spn):
target_creds = self._get_creds(account_type)
spn = self._format_spn(spn, target_creds)
sname = self.PrincipalName_create(name_type=NT_PRINCIPAL,
names=spn.split('/'))
client_creds = self.get_client_creds()
tgt = self.get_tgt(client_creds)
samdb = self.get_samdb()
netbios_domain_name = samdb.domain_netbios_name()
dns_domain_name = samdb.domain_dns_name()
subkey = self.RandomKey(tgt.session_key.etype)
etypes = (AES256_CTS_HMAC_SHA1_96, ARCFOUR_HMAC_MD5,)
if account_type is self.AccountType.SERVER:
ticket_etype = AES256_CTS_HMAC_SHA1_96
else:
ticket_etype = None
decryption_key = self.TicketDecryptionKey_from_creds(
target_creds, etype=ticket_etype)
if (spn.count('/') > 1
and (spn.endswith(netbios_domain_name)
or spn.endswith(dns_domain_name))
and account_type is not self.AccountType.SERVER
and account_type is not self.AccountType.RODC):
expected_error_mode = KDC_ERR_S_PRINCIPAL_UNKNOWN
check_error_fn = self.generic_check_kdc_error
check_rep_fn = None
else:
expected_error_mode = 0
check_error_fn = None
check_rep_fn = self.generic_check_kdc_rep
kdc_exchange_dict = self.tgs_exchange_dict(
expected_crealm=tgt.crealm,
expected_cname=tgt.cname,
expected_srealm=tgt.srealm,
expected_sname=sname,
ticket_decryption_key=decryption_key,
check_rep_fn=check_rep_fn,
check_error_fn=check_error_fn,
check_kdc_private_fn=self.generic_check_kdc_private,
expected_error_mode=expected_error_mode,
tgt=tgt,
authenticator_subkey=subkey,
kdc_options='0',
expect_edata=False)
self._generic_kdc_exchange(kdc_exchange_dict,
cname=None,
realm=tgt.srealm,
sname=sname,
etypes=etypes)
def setUp(self):
super().setUp()
self.do_asn1_print = global_asn1_print
self.do_hexdump = global_hexdump
def _format_spns(self, spns, creds=None):
return map(lambda spn: self._format_spn(spn, creds), spns)
def _format_spn(self, spn, creds=None):
samdb = self.get_samdb()
spn = spn.format(netbios_domain_name=samdb.domain_netbios_name(),
dns_domain_name=samdb.domain_dns_name())
if creds is not None:
account_name = creds.get_username()
spn = spn.format(account=account_name)
return spn
def _get_creds(self, account_type):
spns = self._format_spns(self.test_spns.values())
if account_type is self.AccountType.RODC:
creds = self._mock_rodc_creds
if creds is None:
creds = self._get_mock_rodc_creds(spns)
type(self)._mock_rodc_creds = creds
else:
creds = self.get_cached_creds(
account_type=account_type,
opts={
'spn': spns
})
return creds
def _get_mock_rodc_creds(self, spns):
rodc_ctx = self.get_mock_rodc_ctx()
for spn in spns:
spn = spn.format(account=rodc_ctx.myname)
if spn not in rodc_ctx.SPNs:
rodc_ctx.SPNs.append(spn)
samdb = self.get_samdb()
rodc_dn = ldb.Dn(samdb, rodc_ctx.acct_dn)
msg = ldb.Message(rodc_dn)
msg['servicePrincipalName'] = ldb.MessageElement(
rodc_ctx.SPNs,
ldb.FLAG_MOD_REPLACE,
'servicePrincipalName')
samdb.modify(msg)
creds = KerberosCredentials()
creds.guess(self.get_lp())
creds.set_realm(rodc_ctx.realm.upper())
creds.set_domain(rodc_ctx.domain_name)
creds.set_password(rodc_ctx.acct_pass)
creds.set_username(rodc_ctx.myname)
creds.set_workstation(rodc_ctx.samname)
creds.set_dn(rodc_dn)
creds.set_spn(rodc_ctx.SPNs)
res = samdb.search(base=rodc_dn,
scope=ldb.SCOPE_BASE,
attrs=['msDS-KeyVersionNumber'])
kvno = int(res[0].get('msDS-KeyVersionNumber', idx=0))
creds.set_kvno(kvno)
keys = self.get_keys(samdb, rodc_dn)
self.creds_set_keys(creds, keys)
return creds
if __name__ == "__main__":
global_asn1_print = False
global_hexdump = False
import unittest
unittest.main()
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