Скачать или смотреть Customizing Authorization in ASP.NET Core 5.0

Discover how to effectively customize `authorization` in ASP.NET Core 5.0. Learn about the solution to common issues, improving your app's security with better user access validation.
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This video is based on the question https://stackoverflow.com/q/70717436/ asked by the user 'Mahmood' ( https://stackoverflow.com/u/13390090/ ) and on the answer https://stackoverflow.com/a/70717437/ provided by the user 'Mahmood' ( https://stackoverflow.com/u/13390090/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Customizing Authorization in ASP.NET Core 5.0: A Comprehensive Guide

Authorization is a critical component of securing web applications, ensuring that users can only access the resources they're entitled to. In the case of ASP.NET Core, especially with the release of version 5.0, developers often face challenges in implementing custom authorization handlers. In this post, we'll delve into a common issue encountered when upgrading from ASP.NET Core 3.1 to 5.0 and provide a step-by-step solution to help you customize your authorization effectively.

The Problem: Loss of RequiredValues in RoutePattern

When working with custom authorization in ASP.NET Core, developers frequently implement authorization handlers to validate user access based on specific route data. The initial approach for retrieving area, controller, and action values involved the following code:

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

While this solution worked seamlessly in ASP.NET Core 3.1, upgrading to version 5.0 led to one significant issue: the RoutePattern does not contain a definition for RequiredValues anymore. This change can disrupt your authorization flow and may leave your application vulnerable.

The Solution: Using HttpContext Instead

To resolve this issue, we need to modify our approach slightly. Instead of relying on RouteEndpoint, we will leverage HttpContext. This adjustment allows us to retrieve the route data necessary for authorization without encountering the same limitations present in version 5.0.

Updated Authorization Handler

Let's look at the modified authorization handler implementation which accommodates the changes introduced in ASP.NET Core 5.0:

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

Breakdown of the Solution

Change the Condition: Instead of checking if the resource is of type RouteEndpoint, we check if it's HttpContext.

Retrieve Route Data: Use httpContext.GetRouteData().Values to get the required values (controller, action, area) for access validation.

Authenticity Check: Maintain the authentication check using context.User.Identity.IsAuthenticated.

Authorization Logic: Leverage the existing securityTrimmingService to determine if the current user can access the specified resources based on the newly acquired values.

This approach allows your application to work seamlessly with ASP.NET Core 5.0 while maintaining robust authorization checks.

Conclusion

By adjusting your custom authorization handler to utilize HttpContext instead of RouteEndpoint, you can overcome the challenges introduced with the migration to ASP.NET Core 5.0. This solution ensures that your application's security remains intact, guarding against unauthorized access and validating user permissions effectively.

Adapting to framework changes can be challenging, but with the right solution, you can maintain control over your application's security features with ease.

If you have any further questions or need assistance with your ASP.NET Core project, feel free to reach out!