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# Unix SMB/CIFS implementation.
#
# Blackbox tests for getting Kerberos tickets from Group Managed Service Account and other (local) passwords
#
# Copyright (C) Catalyst.Net Ltd. 2023
#
# Written by Rob van der Linde <rob@catalyst.net.nz>
#
# Copyright Andrew Bartlett <abartlet@samba.org> 2023
#
# 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 os
import sys
sys.path.insert(0, "bin/python")
os.environ["PYTHONUNBUFFERED"] = "1"
from ldb import SCOPE_BASE
from samba import credentials
from samba.credentials import MUST_USE_KERBEROS
from samba.dcerpc import security
from samba.domain.models import User
from samba.dsdb import UF_NORMAL_ACCOUNT, UF_WORKSTATION_TRUST_ACCOUNT
from samba.ndr import ndr_pack, ndr_unpack
from samba.tests import (BlackboxProcessError, BlackboxTestCase, connect_samdb,
delete_force)
# If not specified, this is None, meaning local sam.ldb
PW_READ_URL = os.environ.get("PW_READ_URL")
# We still need to connect to a remote server to check we got the ticket
SERVER = os.environ.get("SERVER")
PW_CHECK_URL = f"ldap://{SERVER}"
# For authentication to PW_READ_URL if required
SERVER_USERNAME = os.environ["USERNAME"]
SERVER_PASSWORD = os.environ["PASSWORD"]
CREDS = f"-U{SERVER_USERNAME}%{SERVER_PASSWORD}"
class GetKerberosTicketTest(BlackboxTestCase):
"""Blackbox tests for GMSA getpassword and connecting as that user."""
@classmethod
def setUpClass(cls):
cls.lp = cls.get_loadparm()
cls.env_creds = cls.get_env_credentials(lp=cls.lp,
env_username="USERNAME",
env_password="PASSWORD",
env_domain="DOMAIN",
env_realm="REALM")
if PW_READ_URL is None:
url = cls.lp.private_path("sam.ldb")
else:
url = PW_CHECK_URL
cls.samdb = connect_samdb(url, lp=cls.lp, credentials=cls.env_creds)
super().setUpClass()
@classmethod
def setUpTestData(cls):
cls.gmsa_username = "GMSA_K5Test_User$"
cls.username = "get-kerberos-ticket-test"
cls.user_base_dn = f"CN=Users,{cls.samdb.domain_dn()}"
cls.user_dn = f"CN={cls.username},{cls.user_base_dn}"
cls.gmsa_base_dn = f"CN=Managed Service Accounts,{cls.samdb.domain_dn()}"
cls.gmsa_user_dn = f"CN={cls.gmsa_username},{cls.gmsa_base_dn}"
msg = cls.samdb.search(base="", scope=SCOPE_BASE, attrs=["tokenGroups"])[0]
connecting_user_sid = str(ndr_unpack(security.dom_sid, msg["tokenGroups"][0]))
domain_sid = security.dom_sid(cls.samdb.get_domain_sid())
allow_sddl = f"O:SYD:(A;;RP;;;{connecting_user_sid})"
allow_sd = ndr_pack(security.descriptor.from_sddl(allow_sddl, domain_sid))
details = {
"dn": str(cls.gmsa_user_dn),
"objectClass": "msDS-GroupManagedServiceAccount",
"msDS-ManagedPasswordInterval": "1",
"msDS-GroupMSAMembership": allow_sd,
"sAMAccountName": cls.gmsa_username,
"userAccountControl": str(UF_WORKSTATION_TRUST_ACCOUNT),
}
cls.samdb.add(details)
cls.addClassCleanup(delete_force, cls.samdb, cls.gmsa_user_dn)
user_password = "P@ssw0rd"
utf16pw = ('"' + user_password + '"').encode('utf-16-le')
user_details = {
"dn": str(cls.user_dn),
"objectClass": "user",
"sAMAccountName": cls.username,
"userAccountControl": str(UF_NORMAL_ACCOUNT),
"unicodePwd": utf16pw
}
cls.samdb.add(user_details)
cls.addClassCleanup(delete_force, cls.samdb, cls.user_dn)
cls.gmsa_user = User.get(cls.samdb, account_name=cls.gmsa_username)
cls.user = User.get(cls.samdb, account_name=cls.username)
def get_ticket(self, username, options=None):
if options is None:
options = ""
ccache_path = f"{self.tempdir}/ccache"
ccache_location = f"FILE:{ccache_path}"
cmd = f"user get-kerberos-ticket --output-krb5-ccache={ccache_location} {username} {options}"
try:
self.check_output(cmd)
except BlackboxProcessError as e:
self.fail(e)
self.addCleanup(os.unlink, ccache_path)
return ccache_location
def test_gmsa_ticket(self):
# Get a ticket with the tool
output_ccache = self.get_ticket(self.gmsa_username)
creds = self.insta_creds(template=self.env_creds)
creds.set_kerberos_state(MUST_USE_KERBEROS)
creds.set_named_ccache(output_ccache, credentials.SPECIFIED, self.lp)
db = connect_samdb(PW_CHECK_URL, credentials=creds, lp=self.lp)
msg = db.search(base="", scope=SCOPE_BASE, attrs=["tokenGroups"])[0]
connecting_user_sid = str(ndr_unpack(security.dom_sid, msg["tokenGroups"][0]))
self.assertEqual(self.gmsa_user.object_sid, connecting_user_sid)
def test_user_ticket(self):
output_ccache = self.get_ticket(self.username)
# Get a ticket with the tool
creds = self.insta_creds(template=self.env_creds)
creds.set_kerberos_state(MUST_USE_KERBEROS)
# Currently this is based on reading the unicodePwd, but this should be expanded
creds.set_named_ccache(output_ccache, credentials.SPECIFIED, self.lp)
db = connect_samdb(PW_CHECK_URL, credentials=creds, lp=self.lp)
msg = db.search(base="", scope=SCOPE_BASE, attrs=["tokenGroups"])[0]
connecting_user_sid = str(ndr_unpack(security.dom_sid, msg["tokenGroups"][0]))
self.assertEqual(self.user.object_sid, connecting_user_sid)
def test_user_ticket_gpg(self):
output_ccache = self.get_ticket(self.username, "--decrypt-samba-gpg")
# Get a ticket with the tool
creds = self.insta_creds(template=self.env_creds)
creds.set_kerberos_state(MUST_USE_KERBEROS)
creds.set_named_ccache(output_ccache, credentials.SPECIFIED, self.lp)
db = connect_samdb(PW_CHECK_URL, credentials=creds, lp=self.lp)
msg = db.search(base="", scope=SCOPE_BASE, attrs=["tokenGroups"])[0]
connecting_user_sid = str(ndr_unpack(security.dom_sid, msg["tokenGroups"][0]))
self.assertEqual(self.user.object_sid, connecting_user_sid)
@classmethod
def _make_cmdline(cls, line):
"""Override to pass line as samba-tool subcommand instead.
Automatically fills in HOST and CREDS as well.
"""
if isinstance(line, list):
cmd = ["samba-tool"] + line
if PW_READ_URL is not None:
cmd += ["-H", PW_READ_URL, CREDS]
else:
cmd = f"samba-tool {line}"
if PW_READ_URL is not None:
cmd += "-H {PW_READ_URL} {CREDS}"
return super()._make_cmdline(cmd)
if __name__ == "__main__":
import unittest
unittest.main()
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