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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 sys
import os
sys.path.insert(0, "bin/python")
os.environ["PYTHONUNBUFFERED"] = "1"
from samba.tests.krb5.raw_testcase import RawKerberosTest
import samba.tests.krb5.rfc4120_pyasn1 as krb5_asn1
from samba.tests.krb5.rfc4120_constants import (
AES256_CTS_HMAC_SHA1_96,
ARCFOUR_HMAC_MD5,
KDC_ERR_PREAUTH_FAILED,
KDC_ERR_PREAUTH_REQUIRED,
KDC_ERR_SKEW,
KRB_AS_REP,
KRB_ERROR,
KU_PA_ENC_TIMESTAMP,
PADATA_ENC_TIMESTAMP,
PADATA_ETYPE_INFO2,
NT_PRINCIPAL,
NT_SRV_INST,
)
global_asn1_print = False
global_hexdump = False
class KdcTests(RawKerberosTest):
""" Port of the tests in source4/torture/krb5/kdc-heimdal.c
To python.
"""
def setUp(self):
super().setUp()
self.do_asn1_print = global_asn1_print
self.do_hexdump = global_hexdump
def as_req(self, creds, etypes, padata=None):
user = creds.get_username()
realm = creds.get_realm()
cname = self.PrincipalName_create(
name_type=NT_PRINCIPAL,
names=[user])
sname = self.PrincipalName_create(
name_type=NT_SRV_INST,
names=["krbtgt", realm])
till = self.get_KerberosTime(offset=36000)
kdc_options = 0
req = self.AS_REQ_create(padata=padata,
kdc_options=str(kdc_options),
cname=cname,
realm=realm,
sname=sname,
from_time=None,
till_time=till,
renew_time=None,
nonce=0x7fffffff,
etypes=etypes,
addresses=None,
additional_tickets=None)
rep = self.send_recv_transaction(req)
return rep
def get_enc_timestamp_pa_data(self, creds, rep, skew=0):
rep_padata = self.der_decode(
rep['e-data'],
asn1Spec=krb5_asn1.METHOD_DATA())
for pa in rep_padata:
if pa['padata-type'] == PADATA_ETYPE_INFO2:
etype_info2 = pa['padata-value']
break
etype_info2 = self.der_decode(
etype_info2, asn1Spec=krb5_asn1.ETYPE_INFO2())
key = self.PasswordKey_from_etype_info2(creds, etype_info2[0])
(patime, pausec) = self.get_KerberosTimeWithUsec(offset=skew)
pa_ts = self.PA_ENC_TS_ENC_create(patime, pausec)
pa_ts = self.der_encode(pa_ts, asn1Spec=krb5_asn1.PA_ENC_TS_ENC())
pa_ts = self.EncryptedData_create(key, KU_PA_ENC_TIMESTAMP, pa_ts)
pa_ts = self.der_encode(pa_ts, asn1Spec=krb5_asn1.EncryptedData())
pa_ts = self.PA_DATA_create(PADATA_ENC_TIMESTAMP, pa_ts)
return pa_ts
def check_pre_authenication(self, rep):
""" Check that the kdc response was pre-authentication required
"""
self.check_error_rep(rep, KDC_ERR_PREAUTH_REQUIRED)
def check_as_reply(self, rep):
""" Check that the kdc response is an AS-REP and that the
values for:
msg-type
pvno
tkt-pvno
kvno
match the expected values
"""
# Should have a reply, and it should an AS-REP message.
self.assertIsNotNone(rep)
self.assertEqual(rep['msg-type'], KRB_AS_REP)
# Protocol version number should be 5
pvno = int(rep['pvno'])
self.assertEqual(5, pvno)
# The ticket version number should be 5
tkt_vno = int(rep['ticket']['tkt-vno'])
self.assertEqual(5, tkt_vno)
# Check that the kvno is not an RODC kvno
# MIT kerberos does not provide the kvno, so we treat it as optional.
# This is tested in compatability_test.py
if 'kvno' in rep['enc-part']:
kvno = int(rep['enc-part']['kvno'])
# If the high order bits are set this is an RODC kvno.
self.assertEqual(0, kvno & 0xFFFF0000)
def check_error_rep(self, rep, expected):
""" Check that the reply is an error message, with the expected
error-code specified.
"""
self.assertIsNotNone(rep)
self.assertEqual(rep['msg-type'], KRB_ERROR)
self.assertEqual(rep['error-code'], expected)
def test_aes256_cts_hmac_sha1_96(self):
creds = self.get_user_creds()
etype = (AES256_CTS_HMAC_SHA1_96,)
rep = self.as_req(creds, etype)
self.check_pre_authenication(rep)
padata = self.get_enc_timestamp_pa_data(creds, rep)
rep = self.as_req(creds, etype, padata=[padata])
self.check_as_reply(rep)
etype = rep['enc-part']['etype']
self.assertEqual(AES256_CTS_HMAC_SHA1_96, etype)
def test_arc4_hmac_md5(self):
creds = self.get_user_creds()
etype = (ARCFOUR_HMAC_MD5,)
rep = self.as_req(creds, etype)
self.check_pre_authenication(rep)
padata = self.get_enc_timestamp_pa_data(creds, rep)
rep = self.as_req(creds, etype, padata=[padata])
self.check_as_reply(rep)
etype = rep['enc-part']['etype']
self.assertEqual(ARCFOUR_HMAC_MD5, etype)
def test_aes_rc4(self):
creds = self.get_user_creds()
etype = (AES256_CTS_HMAC_SHA1_96, ARCFOUR_HMAC_MD5)
rep = self.as_req(creds, etype)
self.check_pre_authenication(rep)
padata = self.get_enc_timestamp_pa_data(creds, rep)
rep = self.as_req(creds, etype, padata=[padata])
self.check_as_reply(rep)
etype = rep['enc-part']['etype']
self.assertEqual(AES256_CTS_HMAC_SHA1_96, etype)
def test_clock_skew(self):
creds = self.get_user_creds()
etype = (AES256_CTS_HMAC_SHA1_96, ARCFOUR_HMAC_MD5)
rep = self.as_req(creds, etype)
self.check_pre_authenication(rep)
padata = self.get_enc_timestamp_pa_data(creds, rep, skew=3600)
rep = self.as_req(creds, etype, padata=[padata])
self.check_error_rep(rep, KDC_ERR_SKEW)
def test_invalid_password(self):
creds = self.insta_creds(template=self.get_user_creds())
creds.set_password("Not the correct password")
etype = (AES256_CTS_HMAC_SHA1_96,)
rep = self.as_req(creds, etype)
self.check_pre_authenication(rep)
padata = self.get_enc_timestamp_pa_data(creds, rep)
rep = self.as_req(creds, etype, padata=[padata])
self.check_error_rep(rep, KDC_ERR_PREAUTH_FAILED)
if __name__ == "__main__":
global_asn1_print = False
global_hexdump = False
import unittest
unittest.main()
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