gcp_serviceusage_allowed_services_v1.yaml

# Copyright 2019 Google Inc.
#
# 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-serviceusage-allowed-services-v1
spec:
  crd:
    spec:
      names:
        kind: GCPServiceUsageConstraintV1
      validation:
        openAPIV3Schema:
          properties:
            mode:
              description: "Enforcement mode, defaults to allow"
              type: string
              enum: [allow, deny]
            services:
              description: "List of APIs to enforce on e.g compute.googleapis.com"
              type: array
              items:
                type: string
  targets:
    validation.gcp.forsetisecurity.org:
      rego: | #INLINE("validator/serviceusage_service.rego")
            #
            # Copyright 2018 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.GCPServiceUsageConstraintV1
            
            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 == "serviceusage.googleapis.com/Service"
            
            	service_usage := asset.resource.data
            	parent := service_usage.parent
            	state := service_usage.state
            	service := service_usage.name
            
            	mode := lib.get_default(params, "mode", "allow")
            
            	state == "ENABLED"
            	matches_found = [m | m = params.services[_]; m == service]
            	target_match_count(mode, desired_count)
            	count(matches_found) != desired_count
            
            	message := sprintf("%v violates a service constraint", [asset.name])
            	metadata := {
            		"resource": asset.name,
            		"mode": mode,
            		"service": service,
            	}
            }
            
            ###########################
            # Rule Utilities
            ###########################
            
            target_match_count(mode) = 0 {
            	mode == "deny"
            }
            
            target_match_count(mode) = 1 {
            	mode == "allow"
            }
            #ENDINLINE