# Copyright 2025 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# yaml-language-server: $schema=../../../../schemas/custom-constraint.schema.json

custom.firewallRestrictDirectoryServicesRule:
  action_type: DENY
  condition: |-
    resource.direction.matches('INGRESS') &&
      resource.sourceRanges.exists(range, range == '0.0.0.0/0') &&
      (
        resource.allowed.containsFirewallPort('tcp', '445') ||
        resource.allowed.containsFirewallPort('tcp', '389') ||
        resource.allowed.containsFirewallPort('tcp', '636') ||
        resource.allowed.containsFirewallPort('udp', '445') ||
        resource.allowed.containsFirewallPort('udp', '389')
      )
  description: Ensure that directory and authentication services (SMB/CIFS, LDAP)
    are not accessible from the Internet when using VPC Firewall Rule
  display_name: Restrict VPC Firewall rules allowing directory service access from
    any source
  method_types:
  - CREATE
  - UPDATE
  resource_types:
  - compute.googleapis.com/Firewall
