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Discover how to secure your React application and .NET Core API with Azure AD Single Sign-On, ensuring only authorized users from your tenant can access them.
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Configuring React Client with .NET Core 3.1: A Complete Guide to Single Tenant SSO

Single Sign-On (SSO) is increasingly becoming essential for web applications, especially when securing APIs and client applications with authentication frameworks. If you are thinking of how to configure your React client with a .NET Core 3.1 backend behind Azure Active Directory (Azure AD) authentication, you have come to the right place. In this guide, we will break it down step by step to ensure a smooth integration for single tenant authentication.

Understanding the Problem

You may have a React application and an accompanying .NET Core API, and you want both to be secure behind Azure AD, meaning users must authenticate before they can access these resources. It’s important to lock down your API endpoints (e.g., using the [Authorize] attribute) and configure your Azure AD settings correctly to ensure that users must be a part of your organization (tenant) to gain access.

How Does Azure AD Work for Single Tenant Authentication?

Azure AD Registration

In the context of Azure AD, registrations are necessary to represent your applications (both front-end and back-end). For a single tenant setup:

Single Registration: You only need one registration for your API and client application.

Authentication: Your application will authenticate as a Single Page Application (SPA), setting the redirect URI to your React app's local development URL (e.g., http://localhost:3000).

Implicit Grant Settings: Make sure to check both "Access tokens" and "ID tokens" under Implicit Grant in the Azure AD application registration settings.

API Exposure and Scopes

After registration:

Expose the API: In Azure AD, exposed APIs can have defined scopes that your client app can request to perform actions on behalf of users.

API ID URI: This could look like api://<guid>.

Custom Scopes: Create a scope specific to your needs (e.g., api://<guid>/api).

Setting Permissions

Use API Permissions to grant your client app access to the registered API. Under "My APIs", select your application and allow it to use the custom scope you created earlier.

Adding to Your authProvider.ts

In the authProvider.ts file of your React application, you’ll specify the scopes for authentication as follows:

[[See Video to Reveal this Text or Code Snippet]]

React Client Setup

When configuring your React application, you’ll typically utilize a library like react-aad-msal to handle Azure AD authentication. Your index.tsx file should look similar to this:

[[See Video to Reveal this Text or Code Snippet]]

Testing Authentication

Once your setup is complete, test your API endpoints from Postman or your React client. If the bearer token is correctly issued upon login, your requests should succeed only when the user is authenticated. Disabling authentication should lead to a 401 Unauthorized response, confirming that the security measures are functioning as expected.

Conclusion

Configuring a React client with a .NET Core 3.1 backend and Azure Active Directory for single tenant SSO can be achieved through careful setup of Azure AD registrations, scopes, and client permissions. The key takeaway is to ensure your applications are correctly registered and configured to protect your resources while granting access only to authorized users within your tenant.

If you follow this guide and set up your configurations correctly, you will have a secure environment that authenticates users before granting them access to your applications and APIs.

If you have any questions or need further clarification, feel free to reach out! Happy coding!