kong-plugin-mtls-acl

kong-plugin-mtls-acl is an Open Source plugin for Kong which restricts access based on certificate information provided in an HTTP header. It is similar (but simpler) than the acl built-in plugin.

This plugin requires an mtls-auth plugin to have been already enabled on the Service or Route.

The implementation of this plugin was inspired by the acl and oidc-acl plugins.

Install

Install luarocks and run the following command

luarocks install kong-plugin-mtls-acl

You also need to set the KONG_PLUGINS environment variable

export KONG_PLUGINS=mtls-auth,mtls-acl

Configuration

To enable the plugin for a service:

curl -X POST http://localhost:8001/services/{ID}/plugins \
    --data "name=mtls-acl"  \
    --data "config.allow=client1" \
    --data "config.allow=client2"

To enable the plugin using declarative config in kong.yml:

plugins: 
- name: mtls-auth
  config:
    allow:
	- client1
	- client2

Form Parameter	Default	Required	Description
certificate_header_name		true	The name of the HTTP header from where certificate information is going to be extracted. This should be same as what you have set in mtls-auth plugin.
hide_certificate_header	false	false	Flag that if enabled (true), prevents the certificate_header_name to be sent in the request to the Upstream service.
allow		semi-optional	The certificate(s) to allow
deny		semi-optional	The certificate(s) to deny

You can’t configure an ACL with both allow and deny configurations. An ACL with an allow provides a positive security model, in which the configured groups are allowed access to the resources, and all others are inherently rejected. By contrast, a deny configuration provides a negative security model, in which certain groups are explicitly denied access to the resource (and all others are allowed).

License

Copyright 2023 Björn Beskow

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.