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Struggling with the `access_denied` error in Keycloak even when permissions seem correct? Discover how to resolve this issue effectively!
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Understanding the Access Denied Error in Keycloak

When working with Keycloak, you might run into a frustrating scenario where a client user faces an access_denied error, despite having the necessary permissions. This problem can impede your application's functionality and frustrate users who are unable to access the resources they need. In this guide, we'll dive into the details of this issue and how to resolve it effectively.

The Problem: Access Denied Error

In our scenario, a user named "Client" has been set up in Keycloak, which is responsible for managing authentication and authorization for your application. With multiple resources available, the Admin user has access to everything, but the Client user can only access specific resources. Despite the Keycloak console confirming that permissions are set correctly, the Client user encounters an access_denied error upon attempting to access certain pages.

Key Observations

The Admin user can access all resources without issue.

The Client user can log in and access some functionality but is blocked by an error when trying to reach specific pages.

Log messages indicate:

error="access_denied"

error_description="Invalid token does not contain resource id (ums)"

This can leave developers scratching their heads about what could possibly be wrong. After examining the issue more closely, we can uncover the solution.

Solution: Assigning the Default Client Role

The solution to this puzzle lies in ensuring that the Client user has the correct roles assigned. Specifically, the uma_protection role must be attributed to the Client user in Keycloak. This role is significant because it provides the capabilities necessary for the Client user to perform actions across various resources in the application.

Steps to Resolve the Issue

Follow these steps to assign the uma_protection role to your Client user:

Access the Keycloak Admin Console: Log into your Keycloak admin account and navigate to your realm where your users are configured.

Locate the Client User: Go to the "Users" section and find your Client user for whom you're receiving the access_denied error.

Editing User Roles: Click on the user and navigate to the "Role Mappings" tab.

Assign uma_protection Role: Under the "Available Roles" section, search for uma_protection and assign it to the Client user by moving it to the "Assigned Roles" section.

Save Changes: Make sure to save the changes you’ve made to update the user roles.

Conclusion

By following the above steps to assign the uma_protection role, the Client user's permissions will align with the requirements, eliminating the access_denied error as they access your application’s resources.

If you continue to encounter issues, make sure that all roles and resource permissions are correctly assigned in Keycloak. Sometimes, a simple oversight can lead to frustrating errors, but with the right knowledge and steps, you can ensure smooth and secure user access.

Remember, the key to resolving the access_denied error lies in understanding the correct role associations within Keycloak. Now, you can get back to focusing on building your application without permission-related interruptions!