Integrating SSO with OAuth

1. Introduction

Integrating Single Sign-On (SSO) with OAuth can significantly enhance user experience by allowing users to authenticate once and gain access to multiple applications without needing to log in again. This lesson provides a detailed walkthrough on integrating SSO using OAuth.

2. Key Concepts

• SSO (Single Sign-On): A user authentication process that allows a user to access multiple applications with one set of login credentials.
• OAuth: An open standard for access delegation, commonly used as a way to grant websites or applications limited access to user information without exposing passwords.
• Authorization Code Flow: A common OAuth 2.0 flow that involves obtaining an authorization code from the authorization server, which is then exchanged for an access token.

3. Implementation Steps

Follow these steps to integrate SSO with OAuth:

1. Register your application: Register your application with an identity provider (IdP) that supports OAuth (e.g., Google, Auth0).
2. Configure redirect URIs: Set up redirect URIs in your IdP settings for successful authentication callback.
3. Integrate OAuth library: Use an OAuth library (e.g., OAuth.js, Auth0 SDK) in your front-end application.

   import { Auth0Client } from '@auth0/auth0-spa-js';

4. Implement authentication flow: Use the library to handle login and logout.

   const auth0 = new Auth0Client({ domain: 'YOUR_DOMAIN', client_id: 'YOUR_CLIENT_ID' });

5. Handle tokens: After authentication, handle access tokens securely.

   const token = await auth0.getTokenSilently();

4. Best Practices

• Always use HTTPS to protect tokens during transmission.
• Store tokens securely, using secure cookies or local storage with caution.
• Implement token expiration and refresh mechanisms.
• Regularly review and update your OAuth configurations and permissions.

5. FAQ