README

A YOURLS plugin that restricts administrative access based on Keycloak roles. Only users with the "User" role in Keycloak are allowed to access the YOURLS admin interface. Only users with the "Admin" role in Keycloak are allowed to manage plugins in the YOURLS admin interface.

Features

• Role-based Access Control:
  • Restricts YOURLS admin interface to users with the Keycloak "User" role
  • Restricts plugin management to users with the Keycloak "Admin" role
• JWT Token Validation: Decodes and validates Keycloak ID tokens from user sessions
• Admin Menu Control: Dynamically removes plugin menu items for unauthorized users
• Debug Support: Comprehensive debugging output when YOURLS debug mode is enabled
• Session Integration: Works seamlessly with existing OIDC/Keycloak authentication

Requirements

• YOURLS URL shortener
• Keycloak server with OIDC authentication configured
• PHP 8.0 or higher
• The Keycloak Plugin installed and configured
• Active PHP session with Keycloak ID tokens

Installation

1. Download or clone this repository to your YOURLS plugins directory:

   cd /path/to/yourls/user/plugins/
   git clone https://github.com/julabo/keycloak_roles_yourls.git

2. Activate the plugin through the YOURLS admin interface or by adding it to your configuration.

Configuration

The plugin uses the following constants that can be customized:

• OIDC_ADMIN_ROLE: The Keycloak role required for admin access (default: "Admin")
• OIDC_USER_ROLE: The Keycloak role required for user access (default: "User")

To change the required role, modify this constants in your config.php:

define('OIDC_ADMIN_ROLE', 'YourCustomAdminRole');
define('OIDC_USER_ROLE', 'YourCustomUserRole');

How It Works

1. Token Validation: The plugin checks for the presence of oidc_id_token in the user's session
2. JWT Decoding: Decodes the JWT payload to extract user roles
3. Role Verification: Checks if the user has the required role in resource_access.yourls.roles
4. Access Control: Blocks access to plugins.php and removes plugin menu items for unauthorized users

Debugging

Enable YOURLS debug mode to see detailed token and role information:

php define('YOURLS_DEBUG', true);

This will display:

• Current script being accessed
• Decoded ID token payload
• User roles from Keycloak
• Access control decisions

Security Features

• 403 Forbidden Response: Unauthorized access attempts return proper HTTP status codes
• Menu Item Removal: Plugin management links are hidden from unauthorized users
• Session-based Validation: Relies on server-side session data, not client-side tokens

Keycloak Configuration

Ensure your Keycloak client is configured to:

1. Include the "yourls" resource in the access token
2. Assign appropriate roles to users under the "yourls" client scope
3. Configure OIDC authentication for your YOURLS instance

Error Handling

The plugin gracefully handles:

• Missing or invalid JWT tokens
• Malformed token payloads
• Missing role information
• Session initialization issues

License

This project is licensed under the MIT License - see the LICENSE file for full license text.

Support

For issues, feature requests, or contributions, please visit the GitHub repository.