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#!/usr/bin/env python3
# Unix SMB/CIFS implementation.
# Copyright (C) Samuel Cabrero 2021
#
# 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 pwd
import ctypes
from samba.tests import env_get_var_value
from samba.samba3 import libsmb_samba_internal as libsmb
from samba.samba3 import param as s3param
from samba import NTSTATUSError, ntstatus
from samba.tests.krb5.kdc_base_test import KDCBaseTest
from samba.credentials import MUST_USE_KERBEROS, DONT_USE_KERBEROS
class SmbMinDomainUid(KDCBaseTest):
"""Test for SMB authorization without NSS winbind. In such setup domain
accounts are mapped to local accounts using the 'username map' option.
"""
def setUp(self):
super(KDCBaseTest, self).setUp()
# Create a user account, along with a Kerberos credentials cache file
# where the service ticket authenticating the user are stored.
self.samdb = self.get_samdb()
self.mach_name = env_get_var_value('SERVER')
self.user_name = "root"
self.service = "cifs"
self.share = "tmp"
# Create the user account.
(self.user_creds, _) = self.create_account(self.samdb, self.user_name)
# Build the global inject file path
server_conf = env_get_var_value('SMB_CONF_PATH')
server_conf_dir = os.path.dirname(server_conf)
self.global_inject = os.path.join(server_conf_dir, "global_inject.conf")
def _test_min_uid(self, creds):
# Assert unix root uid is less than 'idmap config ADDOMAIN' minimum
s3_lp = s3param.get_context()
s3_lp.load(self.get_lp().configfile)
domain_range = s3_lp.get("idmap config * : range").split('-')
domain_range_low = int(domain_range[0])
unix_root_pw = pwd.getpwnam(self.user_name)
self.assertLess(unix_root_pw.pw_uid, domain_range_low)
self.assertLess(unix_root_pw.pw_gid, domain_range_low)
conn = libsmb.Conn(self.mach_name, self.share, lp=s3_lp, creds=creds)
# Disconnect
conn = None
# Restrict access to local root account uid
with open(self.global_inject, 'w') as f:
f.write("min domain uid = %s\n" % (unix_root_pw.pw_uid + 1))
with self.assertRaises(NTSTATUSError) as cm:
conn = libsmb.Conn(self.mach_name,
self.share,
lp=s3_lp,
creds=creds)
code = ctypes.c_uint32(cm.exception.args[0]).value
self.assertEqual(code, ntstatus.NT_STATUS_INVALID_TOKEN)
# check that the local root account uid is now allowed
with open(self.global_inject, 'w') as f:
f.write("min domain uid = %s\n" % unix_root_pw.pw_uid)
conn = libsmb.Conn(self.mach_name, self.share, lp=s3_lp, creds=creds)
# Disconnect
conn = None
with open(self.global_inject, 'w') as f:
f.truncate()
def test_min_domain_uid_krb5(self):
krb5_state = self.user_creds.get_kerberos_state()
self.user_creds.set_kerberos_state(MUST_USE_KERBEROS)
ret = self._test_min_uid(self.user_creds)
self.user_creds.set_kerberos_state(krb5_state)
return ret
def test_min_domain_uid_ntlmssp(self):
krb5_state = self.user_creds.get_kerberos_state()
self.user_creds.set_kerberos_state(DONT_USE_KERBEROS)
ret = self._test_min_uid(self.user_creds)
self.user_creds.set_kerberos_state(krb5_state)
return ret
def tearDown(self):
# Ensure no leftovers in global inject file
with open(self.global_inject, 'w') as f:
f.truncate()
super(KDCBaseTest, self).tearDown()
if __name__ == "__main__":
import unittest
unittest.main()
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