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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 ldb import SCOPE_SUBTREE
from samba import NTSTATUSError
from samba.dcerpc import security
from samba.ndr import ndr_unpack
from samba.ntstatus import NT_STATUS_NO_IMPERSONATION_TOKEN
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 SmbTests(KDCBaseTest):
"""Test for SMB authentication using Kerberos credentials stored in a
credentials cache file.
"""
def test_smb(self):
self._run_smb_test()
def test_smb_rename(self):
self._run_smb_test(rename=True)
def test_smb_no_pac(self):
self._run_smb_test(include_pac=False,
expect_error=True)
def _run_smb_test(self, rename=False, include_pac=True,
expect_error=False):
# Create a user account and a machine account, along with a Kerberos
# credentials cache file where the service ticket authenticating the
# user are stored.
samdb = self.get_samdb()
mach_name = samdb.host_dns_name()
service = "cifs"
share = "tmp"
# Create the user account.
user_credentials = self.get_cached_creds(
account_type=self.AccountType.USER,
use_cache=False)
user_name = user_credentials.get_username()
mach_credentials = self.get_dc_creds()
mach_credentials = self.get_dc_creds()
# 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_credentials,
mach_credentials,
service,
mach_name,
pac=include_pac)
# Remove the cached credentials file.
self.addCleanup(os.remove, cachefile.name)
# Retrieve the user account's SID.
ldb_res = samdb.search(scope=SCOPE_SUBTREE,
expression="(sAMAccountName=%s)" % user_name,
attrs=["objectSid"])
self.assertEqual(1, len(ldb_res))
sid = ndr_unpack(security.dom_sid, ldb_res[0]["objectSid"][0])
if rename:
# Rename the account.
new_name = self.get_new_username()
msg = ldb.Message(user_credentials.get_dn())
msg['sAMAccountName'] = ldb.MessageElement(new_name,
ldb.FLAG_MOD_REPLACE,
'sAMAccountName')
samdb.modify(msg)
# Set the Kerberos 5 credentials cache environment variable. This is
# required because the codepath that gets run (gse_krb5) looks for it
# in here and not in the credentials object.
krb5_ccname = os.environ.get("KRB5CCNAME", "")
self.addCleanup(os.environ.__setitem__, "KRB5CCNAME", krb5_ccname)
os.environ["KRB5CCNAME"] = "FILE:" + cachefile.name
# Authenticate in-process to the machine account using the user's
# cached credentials.
# 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(mach_name, share, lp=s3_lp, creds=creds)
except NTSTATUSError as e:
if not expect_error:
self.fail()
enum, _ = e.args
self.assertEqual(NT_STATUS_NO_IMPERSONATION_TOKEN, enum)
return
else:
self.assertFalse(expect_error)
(uid, gid, gids, sids, guest) = conn.posix_whoami()
# Ensure that they match.
self.assertEqual(sid, sids[0])
if __name__ == "__main__":
global_asn1_print = False
global_hexdump = False
import unittest
unittest.main()
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