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# Unix SMB/CIFS implementation.
#
# Tests for `samba-tool user generate-csr`
#
# Copyright (C) Catalyst.Net Ltd 2025
#
# 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
from typing import Optional
from samba.domain.models import Computer, User
from samba.tests.samba_tool.base import SambaToolCmdTest
from cryptography import x509
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import rsa
from cryptography.x509.oid import NameOID
szOID_NTDS_CA_SECURITY_EXT = x509.ObjectIdentifier("1.3.6.1.4.1.311.25.2")
HOST = "ldap://{DC_SERVER}".format(**os.environ)
CREDS = "-U{DC_USERNAME}%{DC_PASSWORD}".format(**os.environ)
class SambaToolUserGenerateCsrTest(SambaToolCmdTest):
cmd = "user"
model = User
user = "alice"
@classmethod
def setUpClass(cls):
super().setUpClass()
cls.samdb = cls.getSamDB("-H", HOST, CREDS)
def test_create_private_key_pem(self):
self._test_create_private_key(encoding=serialization.Encoding.PEM)
def test_create_private_key_der(self):
self._test_create_private_key(encoding=serialization.Encoding.DER)
def test_create_private_key_password(self):
self._test_create_private_key(password="pass1234")
def _test_create_private_key(
self,
*,
encoding: serialization.Encoding = serialization.Encoding.PEM,
password: Optional[str] = None,
):
private_key = rsa.generate_private_key(
public_exponent=65537, key_size=2048, backend=default_backend()
)
if password is not None:
encryption_algorithm = serialization.BestAvailableEncryption(
password.encode("utf-8")
)
else:
encryption_algorithm = serialization.NoEncryption()
private_key_bytes = private_key.private_bytes(
encoding=encoding,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=encryption_algorithm,
)
user = self.model.find(self.samdb, self.user)
account_name = user.account_name
if user.user_principal_name is not None:
account_upn = user.user_principal_name
else:
realm = self.samdb.domain_dns_name()
account_upn = f"{account_name}@{realm.lower()}"
subject_name = x509.Name([
# Note that the subject name is used in certificate mappings
x509.NameAttribute(NameOID.COUNTRY_NAME, "US"),
x509.NameAttribute(NameOID.STATE_OR_PROVINCE_NAME, "SambaState"),
x509.NameAttribute(NameOID.ORGANIZATION_NAME, "SambaSelfTesting"),
x509.NameAttribute(NameOID.ORGANIZATIONAL_UNIT_NAME, "Users"),
x509.NameAttribute(NameOID.COMMON_NAME, account_upn),
])
subject_name_str = subject_name.rfc4514_string()
with self.mktemp() as private_key_filename, self.mktemp() as csr_filename:
with open(private_key_filename, "wb") as private_key_file:
_ = private_key_file.write(private_key_bytes)
cmd = [
self.cmd,
"generate-csr",
"-H",
HOST,
CREDS,
self.user,
subject_name_str,
private_key_filename,
csr_filename,
]
if password is not None:
cmd.append("--private-key-pass")
cmd.append(password)
result, out, err = self.runcmd(*cmd)
self.assertCmdSuccess(result, out, err)
with open(csr_filename, "rb") as csr_file:
csr_bytes = csr_file.read()
csr = x509.load_pem_x509_csr(csr_bytes)
self.assertEqual(subject_name, csr.subject)
try:
sid_extension = csr.extensions.get_extension_for_oid(
szOID_NTDS_CA_SECURITY_EXT,
)
except x509.ExtensionNotFound:
self.fail("expected to find SID extension")
# We don’t check the whole ASN.1 structure is correct, just that it
# contains the encoded SID.
encoded_sid = user.object_sid.encode("utf-8")
self.assertIn(encoded_sid, sid_extension.value.value)
class SambaToolComputerGenerateCsrTest(SambaToolUserGenerateCsrTest):
cmd = "computer"
model = Computer
user = "ADDC"
if __name__ == "__main__":
global_asn1_print = False
global_hexdump = False
import unittest
unittest.main()
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