gcp_gke_enable_shielded_nodes_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.
#
# Check to see if GKE legacy endpoints is disabled.
# https://cloud.google.com/kubernetes-engine/docs/how-to/hardening-your-cluster#protect_node_metadata

apiVersion: templates.gatekeeper.sh/v1alpha1
kind: ConstraintTemplate
metadata:
  name: gcp-gke-enable-shielded-nodes-v1
spec:
  crd:
    spec:
      names:
        kind: GCPGKEEnableShieldedNodesConstraintV1
      validation:
        openAPIV3Schema:
          properties: {}
  targets:
    validation.gcp.forsetisecurity.org:
      rego: | #INLINE("validator/gke_enable_shielded_nodes.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.GCPGKEEnableShieldedNodesConstraintV1
            
            import data.validator.gcp.lib as lib
            
            deny[{
            	"msg": message,
            	"details": metadata,
            }] {
            	constraint := input.constraint
            	asset := input.asset
            	asset.asset_type == "container.googleapis.com/Cluster"
            
            	cluster := asset.resource.data
            	node_pools := lib.get_default(cluster, "nodePools", [])
            	node_pool := node_pools[_]
            
            	# We fail if either the cluster doesn't have shielded vms, or
            	# one of the node pools doesn't have the proper settings.
            	cluster_shielded_nodes_disabled(cluster, node_pool)
            
            	message := sprintf("Cluster %v doesn't use shielded VMs with integrity and secure boot in node pool %v.", [asset.name, node_pool.name])
            	metadata := {"resource": asset.name}
            }
            
            ###########################
            # Rule Utilities
            ###########################
            
            # Checks the Shielded Nodes setting in the cluster configuration.
            cluster_shielded_nodes_disabled(cluster, node_pool) {
            	shielded_nodes := lib.get_default(cluster, "shieldedNodes", {})
            	enabled := lib.get_default(shielded_nodes, "enabled", false)
            	enabled == false
            }
            
            # Checks that all shielded nodes options are enabled for all node pools.
            cluster_shielded_nodes_disabled(cluster, node_pool) {
            	single_pool := lib.get_default(node_pool, "config", {})
            	shieldedInstanceConfig := lib.get_default(single_pool, "shieldedInstanceConfig", {})
            	integrity_monitoring := lib.get_default(shieldedInstanceConfig, "enableIntegrityMonitoring", false)
            	secure_boot := lib.get_default(shieldedInstanceConfig, "enableSecureBoot", false)
            	node_pool_has_insufficient_configuration(integrity_monitoring, secure_boot)
            }
            
            node_pool_has_insufficient_configuration(integrity_monitoring, secure_boot) {
            	integrity_monitoring == false
            }
            
            node_pool_has_insufficient_configuration(integrity_monitoring, secure_boot) {
            	secure_boot == false
            }
            #ENDINLINE