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Consumer authorization

By Kong Inc.
You are browsing documentation for an outdated plugin version.

You can use Kong consumers for authorization and dynamically map claim values to Kong consumers. This means that we restrict the access to only those that do have a matching Kong consumer. Kong consumers can have ACL groups attached to them and be further authorized with the Kong ACL plugin.

Prerequisites

In most cases, the OpenID Connect plugin relies on a third party identity provider (IdP). The examples in this guide use Keycloak as a sample IdP.

Expand the following sections to configure Keycloak and Kong Gateway.

Configure Keycloak

All the *.test domains in the following examples point to the localhost (127.0.0.1 and/or ::1).

We use Keycloak as the identity provider in the following examples, but the steps will be similar in other standard identity providers. If you encounter difficulties during this phase, refer to the Keycloak documentation.

  1. Create a confidential client kong with private_key_jwt authentication and configure Keycloak to download the public keys from [the OpenID Connect Plugin JWKS endpoint][json-web-key-set]:



  2. Create another confidential client service with client_secret_basic authentication. For this client, Keycloak will auto-generate a secret similar to the following: cf4c655a-0622-4ce6-a0de-d3353ef0b714. Enable the client credentials grant for the client:



  3. (Optional) Create another confidential client cert-bound with settings similar to the service client created previously. From the Advanced tab, enable the OAuth 2.0 Mutual TLS Certificate Bound Access Tokens Enabled toggle.

  4. (Optional, to test mTLS Client Authentication) Create another confidential client client-tls-auth with settings similar to the service client created above. From the Credentials tab, select the X509 Certificate Client Authenticator and fill the Subject DN field so that it matches the Kong client certificate’s, e.g.: CN=JohnDoe, OU=IT.

  5. (Optional, to test Demonstrating Proof-of-Possession Client Authentication) Create another confidential client client-dpop-auth with settings similar to the service client created above. From the Advanced tab, enable theOAuth 2.0 DPoP Bound Access Tokens Enabled toggle.

  6. Create a verified user with the name: john and the non-temporary password: doe that can be used with the password grant:

Alternatively you can download the exported Keycloak configuration, and use it to configure the Keycloak. Please refer to Keycloak import documentation for more information.

You need to modify Keycloak standalone.xml configuration file, and change the socket binding from:

<socket-binding name="https" port="${jboss.https.port:8443}"/>

to

<socket-binding name="https" port="${jboss.https.port:8440}"/>

The Keycloak default https port conflicts with the default Kong TLS proxy port, and that can be a problem if both are started on the same host.

Note: The mTLS Client Authentication, along with the proof of possession feature that validates OAuth 2.0 Mutual TLS Certificate Bound Access Tokens, both require configuring Keycloak to validate client certificates with mTLS using the --https-client-auth=request option, and to configure TLS appropriately, including adding the trusted client certificates to the truststore. For more information, refer to the Keycloak documentation.

Configure Kong Gateway

  1. Create a service:

     curl -i -X POST http://localhost:8001/services \
   --data "name=openid-connect" \
   --data "url=https://httpbin.konghq.com/anything"

  2. Create a route:

     curl -i -X POST http://localhost:8001/services/openid-connect/routes \
   --data "name=openid-connect" \
   --data "paths[]=/"

Consumer authorization

The following examples are built with simplicity in mind, and are not meant for a production environment. Because httpbin.konghq.com is the upstream service in these examples, we highly recommended that you do not run these examples with a production identity provider as there is a high chance of leaking information. The examples also use the plain HTTP protocol, which you should never use in production.

Let’s use the following example token payload:

{
   "exp": 1622556713,
   "aud": "account",
   "typ": "Bearer",
   "scope": "openid email profile",
   "preferred_username": "john",
   "given_name": "John",
   "family_name": "Doe"
}

Out of these attributes, the preferred_username claim looks promising for consumer mapping.

Configure the OpenID Connect plugin for integration with the ACL plugin. For the purposes of the demo, you can use the password grant.

For the demo, we’re going to set up the following:

  • Issuer, client ID, and client auth: settings that connect the plugin to your IdP (in this case, the sample Keycloak app).
  • Auth method: password grant (enabled for demo purposes).
  • The preferred_username claim from the example payload.

Make the following request:

curl -X POST http://localhost:8001/services/{serviceName|Id}/plugins \
    --header "accept: application/json" \
    --header "Content-Type: application/json" \
    --data '
    {
  "name": "openid-connect",
  "config": {
    "issuer": "http://keycloak.test:8080/auth/realms/master",
    "client_id": "kong",
    "client_auth": "private_key_jwt",
    "auth_methods": [
      "password"
    ],
    "consumer_claim": [
      "preferred_username"
    ],
    "consumer_by": [
      "username"
    ]
  }
}
    '

Replace SERVICE_NAME|ID with the id or name of the service that this plugin configuration will target.

Make the following request, substituting your own access token, region, control plane ID, and service ID:

curl -X POST \
https://{us|eu}.api.konghq.com/v2/control-planes/{controlPlaneId}/core-entities/services/{serviceId}/plugins \
    --header "accept: application/json" \
    --header "Content-Type: application/json" \
    --header "Authorization: Bearer TOKEN" \
    --data '{"name":"openid-connect","config":{"issuer":"http://keycloak.test:8080/auth/realms/master","client_id":"kong","client_auth":"private_key_jwt","auth_methods":["password"],"consumer_claim":["preferred_username"],"consumer_by":["username"]}}'

See the Konnect API reference to learn about region-specific URLs and personal access tokens.

First, create a KongPlugin resource:

echo "
apiVersion: configuration.konghq.com/v1
kind: KongPlugin
metadata:
  name: openid-connect-example
plugin: openid-connect
config:
  issuer: http://keycloak.test:8080/auth/realms/master
  client_id: kong
  client_auth: private_key_jwt
  auth_methods:
  - password
  consumer_claim:
  - preferred_username
  consumer_by:
  - username
" | kubectl apply -f -

Next, apply the KongPlugin resource to an ingress by annotating the service as follows:

kubectl annotate service SERVICE_NAME konghq.com/plugins=openid-connect-example

Replace SERVICE_NAME with the name of the service that this plugin configuration will target. You can see your available ingresses by running kubectl get service.

Note: The KongPlugin resource only needs to be defined once and can be applied to any service, consumer, or route in the namespace. If you want the plugin to be available cluster-wide, create the resource as a KongClusterPlugin instead of KongPlugin.

Add this section to your declarative configuration file:

plugins:
- name: openid-connect
  service: SERVICE_NAME|ID
  config:
    issuer: http://keycloak.test:8080/auth/realms/master
    client_id: kong
    client_auth: private_key_jwt
    auth_methods:
    - password
    consumer_claim:
    - preferred_username
    consumer_by:
    - username

Replace SERVICE_NAME|ID with the id or name of the service that this plugin configuration will target.

Prerequisite: Configure your Personal Access Token 
terraform {
  required_providers {
    konnect = {
      source  = "kong/konnect"
    }
  }
}

provider "konnect" {
  personal_access_token = "kpat_YOUR_TOKEN"
  server_url            = "https://us.api.konghq.com/"
}

Add the following to your Terraform configuration to create a Konnect Gateway Plugin:

resource "konnect_gateway_plugin_openid_connect" "my_openid_connect" {
  enabled = true

  config = {
    issuer = "http://keycloak.test:8080/auth/realms/master"
    client_id = "kong"
    client_auth = "private_key_jwt"
    auth_methods = ["password"]
    consumer_claim = ["preferred_username"]
    consumer_by = ["username"]
  }

  control_plane_id = konnect_gateway_control_plane.my_konnect_cp.id
  service = {
    id = konnect_gateway_service.my_service.id
  }
}

Test consumer-based authorization

  1. Before moving on, make sure the consumer john doesn’t exist:

     curl -i -X DELETE http//localhost:8001/consumers/john

  2. Now try access the service without a matching consumer:

     curl --user john:doe http://localhost:8000

    You should get an HTTP 403 Forbidden response.

  3. Now, add the consumer:

     curl -i -X PUT http://localhost:8001/consumers/john

    You should get an HTTP 200 if the consumer creation is successful.

  4. Try to access the service again using the same consumer:

     curl --user john:doe http://localhost:8000

    This time, you should get an HTTP 200 response. You should also see that the plugin added X-Consumer-Id and X-Consumer-Username as request headers:

     {
     "headers": {
         "Authorization": "Bearer <access-token>",
         "X-Consumer-Id": "<consumer-id>",
         "X-Consumer-Username": "john"
     },
     "method": "GET"
 }

It is possible to make consumer mapping optional and non-authorizing by setting the configuration parameter config.consumer_optional=true.