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Dynamic Client Registration using Keycloak

We are going walk you through a basic integration of Tyk with Keycloak using the OpenID Connect Dynamic Client Registration protocol. Our current implementation provides support for the client credentials flow with support for JWT JSON Web Tokens . To the developer it works like this:

  1. An API with its corresponding security policy is created in Tyk. It is then added to the Developer Portal Catalogue.

  2. A developer signs up and creates a Dynamic Client Registration provider using the Developer Portal. Tyk sends the Dynamic Client Registration call to your IDPIdentity Provider . The IDP replies with the client ID and secret.

  3. Using the previous information, the developer (or your application) triggers a call to the token endpoint of the IDP. The developer (or your application) then triggers a call to Tyk, using the token that was generated by the IDP. Tyk validates this token using the JWKSJSON Web Key Sets provided by the IDP.

Requirements

Getting started with Keycloak

To get started with Dynamic Client Registration in Keycloak you’ll need to generate an initial access token using the Keycloak Administration Console. After logging in, click Realm settings under Configure and select the Client Registration tab:

Step 1

To generate an initial access token, click Create and set the expiration time and maximum number of clients to be created using this token:

Step 2

Click Save and the token will be created. Keep it safe as you’ll use this token to configure Tyk.

Setting up Tyk

Now you’re ready to set up Tyk. For compatibility reasons, check your tyk_analytics.conf and make sure that a proper oauth_redirect_uri_separator parameter is set. You may use the following value:

    "oauth_redirect_uri_separator": ";",

Note: If you’re using a self-signed certificate on your Keycloak instance, you will need to set additional flags on both gateway and dashboard. For skipping DCR endpoint SSL verification, add the following flag to tyk_analytics.conf:

    "dcr_ssl_insecure_skip_verify": true

Also add the following flag to tyk.conf, this will instruct the gateway to skip SSL verification when the JWT middleware is in use, particularly when JWKS are retrieved from your IDP:

    "jwt_ssl_insecure_skip_verify": true

Remember to restart the services after applying the above changes.

Open the Tyk Dashboard and click APIs under System Management. Create a new API called “Keycloak API”:

Step 3

Complete first part of the API creation form, then click Configure API and set the Authentication mode as in the image below:

Step 4

Note

Where do I get the proper JWKS URI for my Keycloak environment?

The JWKS URI is a required field in the .well-known/openid-configuration endpoint of your OpenID Connect Provider metadata. Please see the OpenID spec for further information.

For the Identity Source field use "sub" and for Policy Field Name use "pol".

  1. Click Save
  2. Select Policies under System Management
  3. Click Create a Policy and call it Keycloak Policy. Use the default values for this policy.
  4. In the Access rights section, select your previously created Keycloak API. You will also need to enter an expiration setting for your keys.

After the policy is created, switch back to the API settings and make sure that the API is using your Keycloak API policy:

Step 5

Now you’re ready to add this API to the Developer Portal.

  1. Click Catalogue under Portal Management on the navigation menu.
  2. Click Add New API, enter a name for it and select the newly created policy. Again, you will use Keycloak Policy:

Step 6

  1. Click Save then open the API added again
  2. Open the Settings tab.
  3. In API Details select the Override global settings option.

Note

Tyk lets you set global portal settings that apply to all portal-listed APIs, in this guide we assume you’re enabling and setting up DCR for a single API. In case you want to enable DCR for all the APIs, you should go to the Settings section under Portal Management, and in the API Access tab you can enter your DCR settings there.

  1. Scroll down to the DCR section and enter the following settings:

Step 7

Providers: Different providers might implement the standard in slightly different ways, Tyk provides a specific driver for each one. For IDPs that aren’t on the list use the Other option.

Grant Types: The OAuth 2.0 grant types that will be used by the client, see the specification for more details.

Token Endpoint Auth Method: defines the way the client will authenticate against the token endpoint.

Response Types: OAuth 2.0 response types that will be used by the client.

Identity Provider Host: Base IDP URL, e.g. https://keycloak:8443/

Client Registration Endpoint: OpenID Connect client registration endpoint. This value is found in your well-known discovery document as registration_endpoint. The well-known location URL is typically https://keycloak:8443/.well-known/openid-configuration

Initial Registration Access Token: the token that’s used to register new clients, this was generated in the early steps of the guide.

Testing the flow

Now that both Tyk and Keycloak are ready we can test the complete flow.

  1. Click Developers under Portal Management
  2. Click on Add developer and create a developer user.

After the developer is created, open your Developer Portal, click on the OAuth Clients navigation bar button and follow the wizard:

Step 8

Click Create first OAuth Client. You’ll see your previously created Keycloak API, select it and click Save and continue. The following screen will require you to enter a client name. It’s also possible to set redirect URLs if you also plan to use this client for other flow types. This setting can be left blank for the purposes of this guide.

Step 9

Once you click Create, Tyk will trigger a registration on your IDP and the details of your client will be displayed:

Step 10

If you check the Keycloak dashboard you will see this client too:

Step 11

The next step is to generate a token and use it for accessing your Keycloak API. We’ll use Postman for this. You will need your token URL which is also the well-known URL for your organisation. For this guide we use https://keycloak:8443/auth/realms/master/protocol/openid-connect/token

Your Postman request should contain the following body, where "client_id" and "client_secret" are the credentials you got from the developer portal:

Step 12

Note that we aren’t using any additional headers for this request, the client credentials are enough.

Once we get a response from the IDP, we can copy the "access_token" and use it to access our Keycloak API, this request will be proxied by Tyk:

Step 13