gcp_sql_allowed_authorized_networks_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-sql-allowed-authorized-networks-v1
spec:
  crd:
    spec:
      names:
        kind: GCPSQLAllowedAuthorizedNetworksConstraintV1
      validation:
        openAPIV3Schema:
          properties:
            authorized_networks:
              description: "Networks CIDR that can be used as authorized
                networks for Cloud SQL instances. For example, 199.27.25.0/24.
                
                The authorized networks specified in the instance need to
                match the ones specified in this constraint. If no
                authorized_networks are specified in the constraint, all
                connections to instances need to be mediated by the
                Cloud SQL Proxy."
              type: array
              items:
                type: string
  targets:
   validation.gcp.forsetisecurity.org:
      rego: | #INLINE("validator/sql_allowed_authorized_networks.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.GCPSQLAllowedAuthorizedNetworksConstraintV1
            
            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 == "sqladmin.googleapis.com/Instance"
            
            	check_ssl(params, asset.resource.data.settings.ipConfiguration) == false
            
            	message := sprintf("%v has networks with SSL settings in violation of policy", [asset.name])
            	metadata := {"resource": asset.name}
            }
            
            deny[{
            	"msg": message,
            	"details": metadata,
            }] {
            	constraint := input.constraint
            	lib.get_constraint_params(constraint, params)
            
            	asset := input.asset
            	asset.asset_type == "sqladmin.googleapis.com/Instance"
            
            	forbidden := forbidden_networks(params, asset.resource.data.settings.ipConfiguration)
            	count(forbidden) > 0
            
            	message := sprintf("%v has authorized networks that are not allowed: %v", [asset.name, forbidden])
            	metadata := {"resource": asset.name}
            }
            
            forbidden_networks(params, ipConfiguration) = forbidden {
            	allowed_authorized_networks = lib.get_default(params, "authorized_networks", [])
            	configured_networks := {network |
            		network = ipConfiguration.authorizedNetworks[_].value
            	}
            
            	matched_networks := {network |
            		network = configured_networks[_]
            		allowed_authorized_networks[_] == network
            	}
            
            	forbidden := configured_networks - matched_networks
            }
            
            check_ssl(params, ipConfiguration) = result {
            	lib.has_field(params, "ssl_enabled") == false
            	result = true
            }
            
            check_ssl(params, ipConfiguration) = result {
            	requireSsl := lib.get_default(ipConfiguration, "requireSsl", false)
            	result = requireSsl == params.ssl_enabled
            }
            #ENDINLINE