README

Although fully functional, this package is still not recommended for public production use yet. It's for private use for now. Last few touches need to be added. Thanks!

Laravel Keycloak

This package is a Laravel client driver for Keycloak authentication.

Installation

You can install the package via composer:

composer require aloko/keycloak

To publish the config file, you need to run the below command.

php artisan vendor:publish --tag=config --provider="Aloko\Keycloak\KeycloakServiceProvider"

This will create a config file named keycloak.php where you can alter various configurations as per your needs.

Configuration

The second step after installation should be configuring this Keycloak client to properly find and connect with Keycloak server.

<?php

return [
    'server_url' => env('KEYCLOAK_SERVER_URL', 'http://localhost:8080'),
   
    'realm' => env('KEYCLOAK_REALM'),

    'client_id' => env('KEYCLOAK_CLIENT_ID'), // The client ID you have created for this client

    'client_secret' => env('KEYCLOAK_CLIENT_SECRET'), // The client secret you have created for this client

    'redirect_uri' => env('KEYCLOAK_REDIRECT_URI', '/auth/callback'), // The redirect uri to which the authorization code will be sent

    'realm_encryption_algo' => env('KEYCLOAK_REALM_ENCRYPTION_ALGO', 'RS256'), // The encryption keys algorithm
    
    'realm_public_key' => env('KEYCLOAL_REALM_PUBLIC_KEY'), // The public key related to this realm

    'stateful' => explode(',', env('KEYCLOAK_STATEFUL_DOMAINS', sprintf(
        '%s%s',
        'localhost,localhost:3000,127.0.0.1,127.0.0.1:8000,::1',
        env('APP_URL') ? ','.parse_url(env('APP_URL'), PHP_URL_HOST) : ''
    ))), // Only needed for SPAs (Single-Page Applications). Check the docs below for more info
];

The next thing you should do is to set keycloak as the default authentication driver for your application. You can change this in your app's config/auth.php.

'guards' => [
    'web' => [
        'driver' => 'keycloak', // THIS LINE
        'provider' => 'users',
    ],

    'api' => [
        'driver' => 'jwt',
        'provider' => 'users',
    ],
]

Users Table Migration

This package expects a field named sub in your users table which contains the unique ID of the users from the Keycloak server end. This is the field that relates a user record from keycloaks database with our local database's users table. You can create that field in your migrations as below.

Schema::table('users', function (Blueprint $table) {
    $table->string('sub', 191)->nullable()->after('id');
});

Usage

Once the configuration is updated with your Keycloak server and local application details. You can start using it in the app. In addition to the methods provided in Illuminate\Contracts\Auth\Guard interface (Auth::check(), Auth::user() Auth::guest(), Auth::id()), this package also provides few additional convenience methods suitable to Keycloak flows. These are Auth::attempt(array $config), Auth::handleCallback(), Auth::userCreateResolver(callable $callback) and Auth::logout().

Sending to Keycloak for Authentication

You can use Auth::attempt() to redirect users to your Keycloak server for the actual authentication process and to obtain an authorization code in case of a successful login. You can put this in one of your controller methods to initiate the process.

public function login(Request $request)
{
    if (Auth::guest()) {
        Auth::attempt();
    }
}

This method also accepts a $config array where you can override configs like scope and redirect_uri. The default value for redirect_uri is used based on the one set in your main configuration file.

Handling Callback

After a successful authentication, the user will be redirected back to your app to the congfigured redirect_uri path explained above. Here you can catch this redirect in your routes file and pass the process to this package's Auth::handleCallback() method which will do all the magic (exchanging the authorization code with access token, id token and referesh token, and validating and persisting the token data in the session) behind the scenes and authenticate the user for you.

Route::get('/auth/callback', function () {
    try {
        Auth::handleCallback();

        return redirect()->route('/dashboard')
    } catch (Exception $e) {
        // Handle the failed authentication the way you want.     
    }
})

The Auth::handleCallback() method throws 3 type of more specific exceptions based on the failure.

FetchAccessTokenFailedException
StateMismatchException
RelatedUserNotFoundException

Handling New Users

By default, this package will only successfully authenticate users if a related record (checked by sub field) exists in app's local database, if it doesn't exist, it will throw RelatedUserNotFoundException on Auth::handleCallback() call.

To allow you to handle this scenario, you can register a callback and return a new instance of user in case the user is not found in the local database. Laravel Keycloak will call this callback whenever a related user is not found in your local database. You can register this callback in your app service provider by calling Auth::userCreateResolver($callback). An instance of Aloko\Keycloak\Token retrieved from Keycloak side is also passed to the callback.

You can fetch the Keycloak user's basic profile details by calling $token->userInfo() which will return an array of users details (['sub', 'name', 'given_name', 'family_name', 'preferred_username', 'email', 'email_verified']).

class AppServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        Auth::userCreateResolver(function (Token $token) {
            $data = $token->userInfo();

            return User::firstOrCreate(
                ['sub' => $data['sub']],
                ['email' => $data['email'], 'name' => $data['name']]
            );
        });
    }
}

Users Logout

You can logout users by simply calling the Auth::logout(array $config) which also accepts a config array using which you can override defaults such as redirect_uri. The redirect_uri for logout defaults to /auth/logout/callback which Keycloak will redirect to once it kills the session from its own side. You can handle the callback like below and do some additional cleanups if required.

Route::get('auth/logout/callback', function() {
    return redirect()->route('login');
});

Using with SPAs (Single-Page Applications)

To also support SPAs, this package is using the same technique as Laravel Sanctum which allows using Laravel's built-in cookie based session authentication services for protecting your app as well as your SPA. Typically, this package utilizes Laravel's web authentication guard to accomplish this. This provides the benefits of CSRF protection, session authentication, as well as protects against leakage of the authentication credentials (Keycloak access tokens, id tokens, etc.) via XSS.

So if your frontend is a SPA (meaning you are using the /api routes of your Laravel backend) and is served on the same top-level domain (subdomains can be different), you need to do two additional configs.

1) Set your SPA's domain under stateful configuration option, it must include the port number, if any (e.g. domain.com, domain.com:9090, localhost:8080)

2) Use the EnsureFrontendRequestsAreStateful middleware in your Kernel.php. This middleware will ensure to configure your API request in a way to successfully authenticate with your currently logged-in Keycloak session.

protected $middlewareGroups = [
    'api' => [
        \Aloko\Keycloak\Http\Middleware\EnsureFrontendRequestsAreStateful::class,
        'throttle:120,1',
        'bindings'
    ],
];

Changelog

Please see CHANGELOG for more information what has changed recently.

Security

If you discover any security related issues, please email mustafa.aloko@gmail.com instead of using the issue tracker.

Credits

License

The MIT License (MIT). Please see License File for more information.

aloko / keycloak

Maintainers

Details