Dynamic Redirect URL/ Wildcard URL in Azure App Registration

Introduction

This article explores the implementation of dynamic redirect URLs, also known as wildcard URLs, within Azure App Registration. Dynamic redirect URLs offer flexibility in handling various callback URLs for authentication and authorization processes. With Azure App Registration, developers can configure wildcard URLs to allow multiple endpoints, enabling seamless integration with various client applications. The article outlines steps to set up dynamic redirect URLs in Azure App Registration, ensuring efficient management of authentication flows across different platforms and environments.

1. Access Azure Portal: Begin by navigating to the Azure Portal (portal.azure.com) and signing in with the appropriate credentials.
2. Select Azure Active Directory: In the Azure portal, locate and select the Azure Active Directory service from the left-hand menu.
3. Choose App Registrations: Within Azure Active Directory, select "App registrations" to manage registered applications.
4. Select or Create Application: Choose the application for which you want to configure dynamic redirect URLs or create a new one if necessary.
5. Configure Redirect URIs: Under the application settings, locate the "Authentication" section. Here, you will find the option to configure redirect URIs.
6. Add Redirect URI: Click on "Add a platform" and select the appropriate platform type, such as Web or Single-page application.
7. Configure Wildcard URL: Instead of providing a specific redirect URI, enter a wildcard URL using the asterisk (*) symbol. For example, https://yourapp.com/callback/* allows dynamic redirect URLs under the /callback endpoint.
8. Save Changes: After adding the wildcard redirect URI, save the changes to update the application settings.

Register your App

When you try to enter the Wildcard URL, you get an error here.

so, remove the Wildcard and just save it.

When you try to save it from the Platform Configuration screen it will not be allowed from there also.

To add a Wildcard URL, you have to go to the Manifest file.

Find out the URL, change it with the Wildcard URL, and Save it.

Go back to Authentication.

Now you can see that your app Wildcard URL is saved.

Conclusion

Configuring dynamic redirect URLs, also known as wildcard URLs, within Azure App Registration offers developers a powerful tool for managing authentication and authorization flows across diverse platforms and environments. By enabling wildcard URLs, developers can accommodate multiple callback endpoints, ensuring seamless integration with various client applications.

However, it's essential to remain vigilant about security concerns associated with wildcard URLs. While wildcard URLs provide flexibility, they can also pose risks if not properly managed. One significant concern is the potential for open redirection attacks, where malicious actors exploit wildcard URLs to redirect users to malicious websites or phishing pages.

To mitigate these security risks, developers must implement strict validation and verification mechanisms. This includes thoroughly validating redirect URLs, enforcing strict whitelisting policies, and regularly monitoring application logs for suspicious activities. Additionally, employing multi-factor authentication and implementing secure coding practices can further enhance the security posture of applications utilizing wildcard URLs.

While wildcard URLs offer flexibility and convenience, it's crucial to prioritize security measures to safeguard against potential threats. By following best practices and remaining vigilant, developers can leverage wildcard URLs effectively while ensuring the integrity and security of their applications.