If you’ve read the Login With Google guide, you would have learned that Flipt supports many methods of authentication for users to control who has access to Flipt.

Keycloak is an open-source identity and access management solution that supports OpenID Connect (OIDC). This guide will serve as a walk-through on how to set up Keycloak for authentication of users of Flipt in your organization.

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What You’ll Learn

In this guide, you will learn how to configure Keycloak as an OIDC provider for Flipt.

By the end of this guide, we will have:

• ⚙️ Setup Keycloak by creating a realm, user, and client
• 🔒 Configured Keycloak as an OIDC provider for Flipt

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Prerequisites

For this guide you’re going to need the following:

• Docker
• Read the Login With Google guide

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Setting Up Keycloak

To set up Keycloak for authentication, you will need to create a new realm, client, and user.

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Step 1: Start Keycloak

Start Keycloak using Docker:

docker run -p 8080:8080 -e KEYCLOAK_ADMIN=admin -e KEYCLOAK_ADMIN_PASSWORD=admin quay.io/keycloak/keycloak:24.0.4 start-dev

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Step 2: Access Keycloak

Access Keycloak at http://localhost:8080 and log in with the admin credentials (admin/admin).

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Step 3: Create a Realm

Create a new realm called flipt:

1. Click on Keycloak in the top-left corner.
2. Click on the Create realm button.
3. Enter flipt as the realm name.
4. Click on the Create button.

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Step 4: Create a User

Create a new user called user:

1. Click on the Users tab.
2. Click on the Create new user button.
3. Fill in the user details and click on the Create button.
4. Set the user’s password by clicking on the Credentials tab and click Set Password.
5. Enter a password and confirm the password.
6. Toggle Temporary to OFF so that the user does not need to change their password on the first login.
7. Click Save.

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Step 5: Create a Client

Create a new client called flipt:

1. Click on the Clients tab.
2. Click on the Create Client button.
3. Ensure OpenID Connect is selected as the client type.
4. Enter flipt as the client ID and click on Next.
5. Ensure the Standard flow and Direct access grants are enabled and click on Next.
6. Set the Valid Redirect URIs to http://localhost:8081/auth/v1/method/oidc/keycloak/callback.
7. Set the Web Origins to http://localhost:8081.
8. Ensure Client authentication is set to ON.
9. Click on Save.

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Step 6: Copy Client ID and Secret

1. From the flipt client, click on the Credentials tab.
2. The client ID will be displayed at the top of the page (e.g., flipt). Copy this value and save it for later.
3. Click on the copy icon next to the Client Secret field to copy the client secret. Save this value for later.

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Step 7: Get Required URLs

1. In another browser tab, paste the following URL into the address bar:

http://localhost:8080/realms/flipt/.well-known/openid-configuration

2. Copy the issuer URL from the JSON response. This will be used as the issuer_url in the Flipt configuration.

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Running Flipt

Now that we have an OIDC client configured in our Keycloak instance, we can begin configuring Flipt to leverage it.

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1. Define a Flipt config.yml

We’re going to create a configuration file named config.yml in the current directory. This file will tell Flipt to increase its logging level to the maximum to aid in debugging. We will also set the HTTP port to 8081 to avoid conflicts with Keycloak.

It will also set authentication as required = true. This is needed to ensure that Flipt enforces its APIs and must be provided with a credential of some sort to gain access.

version: "1.0"

log:
  level: DEBUG

server:
  http_port: 8081

authentication:
  required: true

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2. Add keycloak provider to config.yml

In your config.yml file, add the following configuration in the authentication section to enable the OIDC method and configure the Keycloak provider:

authentication:
  required: true
  session:
    domain: localhost:8081
  methods:
    oidc:
      enabled: true
      providers:
        keycloak:
          issuer_url: "< issuer URL from Keycloak >"
          client_id: "< client ID from Keycloak (e.g., `flipt`) >"
          client_secret: "< client secret from Keycloak >"
          redirect_address: "http://localhost:8081"

The session domain is required for session-compatible authentication methods. It’s used by Flipt as the domain for storing authentication cookies.

Note that we’ve enabled the oidc method, and it has a section called providers. Each key beneath the providers section is unique and can be whatever you want. However, the name is important as it affects the redirect_url generated for the particular provider.

Each provider section has a consistent structure. You’re required to provide the issuer_url, client_id, client_secret and redirect_address.

The scopes section is optional, and allows Flipt the opportunity to obtain additional details on the authenticating caller (e.g. email and profile picture).

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3. Start Flipt

You can now start your Flipt instance using the following command:

docker run -it --rm \
  -p 8080:8080 \
  -v "$(pwd)/config.yml:/config.yml" \
  flipt/flipt:latest ./flipt --config /config.yml

Once Flipt has started you can to navigate your browser to the UI and attempt a login with Keycloak.

When you click Login with Keycloak you should be navigated away to your Keycloak instance to complete the authentication flow.

Once you successfully authenticate with the username/password you created earlier, you should return to Flipt and be logged in.

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Conclusion

🎉 Congratulations, you’ve successfully run Flipt and enabled login with Keycloak as the OIDC provider.

Many of the same production considerations from the Login With Google guide apply here. You should follow the same steps to secure your Flipt instance and ensure that only authorized users can access it.

Next, you might want to consider enabling authorization and setting up policies to control who can access what in Flipt. You can learn more about this in the Role-Based Access Control with Keycloak guide.