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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'
from ldb import SCOPE_SUBTREE
from samba import NTSTATUSError
from samba.credentials import DONT_USE_KERBEROS
from samba.dcerpc import security
from samba.ndr import ndr_unpack
from samba.ntstatus import (
NT_STATUS_NO_IMPERSONATION_TOKEN,
NT_STATUS_LOGON_FAILURE
)
from samba.samba3 import libsmb_samba_internal as libsmb
from samba.samba3 import param as s3param
from samba.tests.krb5.kdc_base_test import KDCBaseTest
global_asn1_print = False
global_hexdump = False
class IdmapNssTests(KDCBaseTest):
mappeduser_uid = 0xffff - 14
mappeduser_sid = security.dom_sid(f'S-1-22-1-{mappeduser_uid}')
unmappeduser_uid = 0xffff - 15
unmappeduser_sid = security.dom_sid(f'S-1-22-1-{unmappeduser_uid}')
def get_mapped_creds(self,
allow_missing_password=False,
allow_missing_keys=True):
c = self._get_krb5_creds(prefix='MAPPED',
allow_missing_password=allow_missing_password,
allow_missing_keys=allow_missing_keys)
c.set_workstation('')
return c
def get_unmapped_creds(self,
allow_missing_password=False,
allow_missing_keys=True):
c = self._get_krb5_creds(prefix='UNMAPPED',
allow_missing_password=allow_missing_password,
allow_missing_keys=allow_missing_keys)
c.set_workstation('')
return c
def get_invalid_creds(self,
allow_missing_password=False,
allow_missing_keys=True):
c = self._get_krb5_creds(prefix='INVALID',
allow_missing_password=allow_missing_password,
allow_missing_keys=allow_missing_keys)
c.set_workstation('')
return c
# Expect a mapping to the local user SID.
def test_mapped_user_kerberos(self):
user_creds = self.get_mapped_creds()
self._run_idmap_nss_test(user_creds, use_kerberos=True,
expected_first_sid=self.mappeduser_sid,
expected_uid=self.mappeduser_uid)
# Expect a mapping to the local user SID.
def test_mapped_user_ntlm(self):
user_creds = self.get_mapped_creds()
self._run_idmap_nss_test(user_creds, use_kerberos=False,
expected_first_sid=self.mappeduser_sid,
expected_uid=self.mappeduser_uid)
def test_mapped_user_no_pac_kerberos(self):
user_creds = self.get_mapped_creds()
self._run_idmap_nss_test(
user_creds, use_kerberos=True, remove_pac=True,
expected_error=NT_STATUS_NO_IMPERSONATION_TOKEN)
def test_unmapped_user_kerberos(self):
user_creds = self.get_unmapped_creds()
self._run_idmap_nss_test(user_creds, use_kerberos=True,
expected_additional_sid=self.unmappeduser_sid,
expected_uid=self.unmappeduser_uid)
def test_unmapped_user_ntlm(self):
user_creds = self.get_unmapped_creds()
self._run_idmap_nss_test(user_creds, use_kerberos=False,
expected_additional_sid=self.unmappeduser_sid,
expected_uid=self.unmappeduser_uid)
def test_unmapped_user_no_pac_kerberos(self):
user_creds = self.get_unmapped_creds()
self._run_idmap_nss_test(
user_creds, use_kerberos=True, remove_pac=True,
expected_error=NT_STATUS_NO_IMPERSONATION_TOKEN)
def test_invalid_user_kerberos(self):
user_creds = self.get_invalid_creds()
self._run_idmap_nss_test(user_creds, use_kerberos=True,
expected_error=NT_STATUS_LOGON_FAILURE)
def test_invalid_user_ntlm(self):
user_creds = self.get_invalid_creds()
self._run_idmap_nss_test(user_creds, use_kerberos=False,
expected_error=NT_STATUS_LOGON_FAILURE)
def test_invalid_user_no_pac_kerberos(self):
user_creds = self.get_invalid_creds()
self._run_idmap_nss_test(
user_creds, use_kerberos=True, remove_pac=True,
expected_error=NT_STATUS_NO_IMPERSONATION_TOKEN)
def _run_idmap_nss_test(self, user_creds,
use_kerberos,
remove_pac=False,
expected_error=None,
expected_first_sid=None,
expected_additional_sid=None,
expected_uid=None):
if expected_first_sid is not None:
self.assertIsNotNone(expected_uid)
if expected_additional_sid is not None:
self.assertIsNotNone(expected_uid)
if expected_uid is not None:
self.assertIsNone(expected_error)
if not use_kerberos:
self.assertFalse(remove_pac)
samdb = self.get_samdb()
server_name = self.host
service = 'cifs'
share = 'tmp'
server_creds = self.get_server_creds()
if expected_first_sid is None:
# Retrieve the user account's SID.
user_name = user_creds.get_username()
res = samdb.search(scope=SCOPE_SUBTREE,
expression=f'(sAMAccountName={user_name})',
attrs=['objectSid'])
self.assertEqual(1, len(res))
expected_first_sid = ndr_unpack(security.dom_sid,
res[0].get('objectSid', idx=0))
if use_kerberos:
# Talk to the KDC to obtain the service ticket, which gets placed
# into the cache. The machine account name has to match the name in
# the ticket, to ensure that the krbtgt ticket doesn't also need to
# be stored.
creds, cachefile = self.create_ccache_with_user(
user_creds,
server_creds,
service,
server_name,
pac=not remove_pac)
# Remove the cached creds file.
self.addCleanup(os.remove, cachefile.name)
# Set the Kerberos 5 creds cache environment variable. This is
# required because the codepath that gets run (gse_krb5) looks for
# it in here and not in the creds object.
krb5_ccname = os.environ.get('KRB5CCNAME', '')
self.addCleanup(os.environ.__setitem__, 'KRB5CCNAME', krb5_ccname)
os.environ['KRB5CCNAME'] = 'FILE:' + cachefile.name
else:
creds = user_creds
creds.set_kerberos_state(DONT_USE_KERBEROS)
# Connect to a share and retrieve the user SID.
s3_lp = s3param.get_context()
s3_lp.load(self.get_lp().configfile)
min_protocol = s3_lp.get('client min protocol')
self.addCleanup(s3_lp.set, 'client min protocol', min_protocol)
s3_lp.set('client min protocol', 'NT1')
max_protocol = s3_lp.get('client max protocol')
self.addCleanup(s3_lp.set, 'client max protocol', max_protocol)
s3_lp.set('client max protocol', 'NT1')
try:
conn = libsmb.Conn(server_name, share, lp=s3_lp, creds=creds)
except NTSTATUSError as e:
enum, _ = e.args
self.assertEqual(expected_error, enum)
return
else:
self.assertIsNone(expected_error)
uid, gid, gids, sids, guest = conn.posix_whoami()
# Ensure that they match.
self.assertEqual(expected_first_sid, sids[0])
self.assertNotIn(expected_first_sid, sids[1:-1])
if expected_additional_sid:
self.assertNotEqual(expected_additional_sid, sids[0])
self.assertIn(expected_additional_sid, sids)
self.assertIsNotNone(expected_uid)
self.assertEqual(expected_uid, uid)
if __name__ == '__main__':
global_asn1_print = False
global_hexdump = False
import unittest
unittest.main()
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