policy-library/policies/templates/gcp_enforce_naming_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
#
#     https://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-enforce-naming-v1
spec:
  crd:
    spec:
      names:
        kind: GCPEnforceNamingConstraintV1
      validation:
        openAPIV3Schema:
          properties:
            naming_rules:
              type: array
              items:
                type: object
                properties:
                  resource:
                    type: string
                  patterns:
                    type: array
                    items:
                      type: string
  targets:
    validation.gcp.forsetisecurity.org:
      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
        #
        #     https://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.GCPEnforceNamingConstraintV1

        import data.validator.gcp.lib as lib

        ###########################
        # Find allowlist Violations
        ###########################
        deny[{
        	"msg": message,
        	"details": metadata,
        }] {
        	constraint := input.constraint
        	lib.get_constraint_params(constraint, params)
        	asset := input.asset
        	naming_rules := lib.get_default(params, "naming_rules", [])
        	count(naming_rules) > 0 # make sure that we have some rules to validate

        	patterns := check_asset_and_return_its_rules(asset.asset_type, naming_rules)
        	name := get_only_asset_name(asset.name)
        	no_name_match(name, patterns)
        	trace(sprintf("no match name:%v, patterns:%v", [name, patterns]))

        	message := sprintf("%v does not obey the naming convention. Full address: %v", [name, asset.name])
        	metadata := {
        		"asset_name": name,
        		"asset_full_address": asset.name,
        		"patterns": patterns,
        	}
        }

        get_only_asset_name(asset_full_name) = name {
        	# we are interested in the last part of the name,
        	# the rest is resource address
        	split_name := split(asset_full_name, "/")
        	last_index := count(split_name) - 1
        	name := split_name[last_index]
        }

        check_asset_and_return_its_rules(asset_type, naming_rules) = patterns {
        	rule = naming_rules[_]
        	rule.resource == asset_type
        	patterns = rule.patterns
        }

        no_name_match(asset_name, patterns) {
        	not match_name(asset_name, patterns)
        }

        match_name(name, patterns) {
        	re_match(patterns[_], name)
        }
        #ENDINLINE