gcp_cmek_rotation_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-cmek-rotation-v1
spec:
  crd:
    spec:
      names:
        kind: GCPCMEKRotationConstraintV1
      validation:
        openAPIV3Schema:
          properties: {}
  targets:
    validation.gcp.forsetisecurity.org:
      rego: | #INLINE("validator/cmek_rotation.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.GCPCMEKRotationConstraintV1
           
           import data.validator.gcp.lib as lib
           
           deny[{
           	"msg": message,
           	"details": metadata,
           }] {
           	constraint := input.constraint
           	lib.get_constraint_params(constraint, params)
           	exempt_list := lib.get_default(params, "exemptions", [])
           	asset := input.asset
           	asset.asset_type == "cloudkms.googleapis.com/CryptoKey"
           
           	# Check if resource is in exempt list
           	matches := {asset.name} & cast_set(exempt_list)
           	count(matches) == 0
           
           	# The rotation period for a key may be "never".  This results
           	# in the rotationPeriod attribute to be omitted from response
           	# from the CAI.  The default is 99999999s.  This is 
           	# sufficiently high enough to cause fail
           	rotation_period_string := lib.get_default(asset.resource.data, "rotationPeriod", "99999999s")
           	rotation_period := time.parse_duration_ns(rotation_period_string)
           
           	period_string := lib.get_default(params, "period", "31536000s")
           	period_to_test := time.parse_duration_ns(period_string)
           
           	rotation_period > period_to_test
           	message := sprintf("%v: CMEK Rotation Period must be at most %v.", [asset.name, period_string])
           	metadata := {"resource": asset.name}
           }
           #ENDINLINE