JezK
Edit File: test_smb.py
#!/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()