gcp_compute_block_ssh_keys_v1.yaml

# Copyright 2021 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-compute-block-ssh-keys-v1
spec:
  crd:
    spec:
      names:
        kind: GCPComputeBlockSSHKeysConstraintV1
      validation:
        openAPIV3Schema:
          properties: {}
  targets:
    validation.gcp.forsetisecurity.org:
      rego: | #INLINE("validator/compute_block_ssh_keys.rego")
        #
        # Copyright 2021 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.GCPComputeBlockSSHKeysConstraintV1
        
        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 == "compute.googleapis.com/Instance"
        	instance := asset.resource.data
        	meta := lib.get_default(instance, "metadata", {"items": []})
        	key = "block-project-ssh-keys"
        
        	# check if key is available and values are as expected
        	not metadata_block_ssh_keys(meta)
        
        	message := sprintf("On this resource %v Ensure that required key '%v' is present and the value is true.", [asset.name, key])
        	metadata := {"resource": asset.name, "key_in_violation": key}
        }
        
        # check for block-project-ssh-keys under metadata items - no violation
        metadata_block_ssh_keys(meta) {
        	metadatum := meta.items[_]
        	metadatum.key == "block-project-ssh-keys"
        	metadatum.value == "true"
        }
        #ENDINLINE