gcp_gke_cluster_location_v1.yaml

# Copyright 2019 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.
#
apiVersion: templates.gatekeeper.sh/v1alpha1
kind: ConstraintTemplate
metadata:
  name: gcp-gke-cluster-location-v1
spec:
  crd:
    spec:
      names:
        kind: GKEClusterLocationConstraintV1
      validation:
        openAPIV3Schema:
          properties:
            allowed_locations:
              description: "Whitelist of regions and/or zones in which GKE
              clusters can be created, e.g. us-central1-a, us-east1. Multiple
              locations can be specified. Regions and zones need to be specified
              separately, as this allows for restricting clusters to be zonal or
              regional, e.g. whitelisting us-central1 will allow regional
              clusters to be created, but will not implicitly allow zonal
              clusters in any us-central1 zone."
              type: array
              items:
                type: string
  targets:
    validation.gcp.forsetisecurity.org:
      rego: |
           #
           # Copyright 2019 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.
           #
           
           package templates.gcp.GKEClusterLocationConstraintV1
           
           import data.validator.gcp.lib as lib
           
           deny[{
           	"msg": message,
           	"details": metadata,
           }] {
           	constraint := input.constraint
           	lib.get_constraint_params(constraint, params)
           	asset := input.asset
           	asset.asset_type == "container.googleapis.com/Cluster"
           
           	cluster_location := asset.resource.data.location
           	target_location := params.allowed_locations
           	count({cluster_location} & cast_set(target_location)) == 0
           
           	message := sprintf("Cluster %v is not allowed in the specified location", [asset.name])
           	metadata := {"resource": asset.name}
           }
           
           ###########################
           # Rule Utilities
           ###########################