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# Unix SMB/CIFS implementation.
#
# Authentication policy model.
#
# Copyright (C) Catalyst.Net Ltd. 2023
#
# Written by Rob van der Linde <rob@catalyst.net.nz>
#
# 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/>.
#
from enum import IntEnum
from ldb import Dn
from .fields import (BooleanField, EnumField, IntegerField, SDDLField,
StringField)
from .model import Model
# Ticket-Granting-Ticket lifetimes.
MIN_TGT_LIFETIME = 45
MAX_TGT_LIFETIME = 2147483647
class StrongNTLMPolicy(IntEnum):
DISABLED = 0
OPTIONAL = 1
REQUIRED = 2
@classmethod
def get_choices(cls):
return sorted([choice.capitalize() for choice in cls._member_names_])
@classmethod
def choices_str(cls):
return ", ".join(cls.get_choices())
class AuthenticationPolicy(Model):
description = StringField("description")
enforced = BooleanField("msDS-AuthNPolicyEnforced")
strong_ntlm_policy = EnumField("msDS-StrongNTLMPolicy", StrongNTLMPolicy)
user_allow_ntlm_network_auth = BooleanField(
"msDS-UserAllowedNTLMNetworkAuthentication")
user_tgt_lifetime = IntegerField("msDS-UserTGTLifetime")
service_allow_ntlm_network_auth = BooleanField(
"msDS-ServiceAllowedNTLMNetworkAuthentication")
service_tgt_lifetime = IntegerField("msDS-ServiceTGTLifetime")
computer_tgt_lifetime = IntegerField("msDS-ComputerTGTLifetime")
user_allowed_to_authenticate_from = SDDLField(
"msDS-UserAllowedToAuthenticateFrom", allow_device_in_sddl=False)
user_allowed_to_authenticate_to = SDDLField(
"msDS-UserAllowedToAuthenticateTo")
service_allowed_to_authenticate_from = SDDLField(
"msDS-ServiceAllowedToAuthenticateFrom", allow_device_in_sddl=False)
service_allowed_to_authenticate_to = SDDLField(
"msDS-ServiceAllowedToAuthenticateTo")
computer_allowed_to_authenticate_to = SDDLField(
"msDS-ComputerAllowedToAuthenticateTo")
@staticmethod
def get_base_dn(samdb):
"""Return the base DN for the AuthenticationPolicy model.
:param samdb: SamDB connection
:return: Dn object of container
"""
base_dn = samdb.get_config_basedn()
base_dn.add_child(
"CN=AuthN Policies,CN=AuthN Policy Configuration,CN=Services")
return base_dn
@staticmethod
def get_object_class():
return "msDS-AuthNPolicy"
@staticmethod
def find(samdb, name):
"""Helper function to return auth policy or raise NotFound.
:param samdb: SamDB connection
:param name: Either DN or name of Authentication Policy
:raises: NotFound if not found
:raises: ValueError if name is not set
"""
if not name:
raise ValueError("Attribute 'name' is required.")
try:
# It's possible name is already a Dn.
dn = name if isinstance(name, Dn) else Dn(samdb, name)
policy = AuthenticationPolicy.get(samdb, dn=dn)
except ValueError:
policy = AuthenticationPolicy.get(samdb, cn=name)
if policy is None:
raise LookupError(f"Authentication policy {name} not found.")
return policy
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