JezK
Edit File: test_ccache.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, gensec from samba.auth import AuthContext from samba.dcerpc import security from samba.ndr import ndr_unpack from samba.ntstatus import NT_STATUS_NO_IMPERSONATION_TOKEN from samba.tests.krb5.kdc_base_test import KDCBaseTest global_asn1_print = False global_hexdump = False class CcacheTests(KDCBaseTest): """Test for authentication using Kerberos credentials stored in a credentials cache file. """ def test_ccache(self): self._run_ccache_test() def test_ccache_rename(self): self._run_ccache_test(rename=True) def test_ccache_no_pac(self): self._run_ccache_test(include_pac=False, expect_anon=True, allow_error=True) def _run_ccache_test(self, rename=False, include_pac=True, expect_anon=False, allow_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. mach_name = "ccachemac" service = "host" samdb = self.get_samdb() # Create the user account. user_credentials = self.get_cached_creds( account_type=self.AccountType.USER, use_cache=False) user_name = user_credentials.get_username() # Create the machine account. (mach_credentials, _) = self.create_account( samdb, mach_name, account_type=self.AccountType.COMPUTER, spn="%s/%s" % (service, mach_name)) # 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, 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) # Authenticate in-process to the machine account using the user's # cached credentials. lp = self.get_lp() lp.set('server role', 'active directory domain controller') settings = {} settings["lp_ctx"] = lp settings["target_hostname"] = mach_name gensec_client = gensec.Security.start_client(settings) gensec_client.set_credentials(creds) gensec_client.want_feature(gensec.FEATURE_SEAL) gensec_client.start_mech_by_sasl_name("GSSAPI") auth_context = AuthContext(lp_ctx=lp, ldb=samdb, methods=[]) gensec_server = gensec.Security.start_server(settings, auth_context) gensec_server.set_credentials(mach_credentials) gensec_server.start_mech_by_sasl_name("GSSAPI") client_finished = False server_finished = False server_to_client = b'' # Operate as both the client and the server to verify the user's # credentials. while not client_finished or not server_finished: if not client_finished: print("running client gensec_update") (client_finished, client_to_server) = gensec_client.update( server_to_client) if not server_finished: print("running server gensec_update") (server_finished, server_to_client) = gensec_server.update( client_to_server) # Ensure that the first SID contained within the obtained security # token is the SID of the user we created. # Retrieve the SIDs from the security token. try: session = gensec_server.session_info() except NTSTATUSError as e: if not allow_error: self.fail() enum, _ = e.args self.assertEqual(NT_STATUS_NO_IMPERSONATION_TOKEN, enum) return token = session.security_token token_sids = token.sids self.assertGreater(len(token_sids), 0) # Ensure that they match. self.assertEqual(sid, token_sids[0]) if __name__ == "__main__": global_asn1_print = False global_hexdump = False import unittest unittest.main()