Скачать или смотреть How to debug Bearer was not authenticated in .NET 8.0 JWT Bearer Authentication

Learn how to effectively debug the `Bearer was not authenticated` error in .NET 8.0 JWT Bearer Authentication and ensure your AWS Cognito tokens are validated correctly.
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This video is based on the question https://stackoverflow.com/q/78056898/ asked by the user 'Jeff' ( https://stackoverflow.com/u/3228754/ ) and on the answer https://stackoverflow.com/a/78057736/ provided by the user 'J.Memisevic' ( https://stackoverflow.com/u/6600207/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Debugging JWT Bearer Authentication in .NET 8.0

When working with web services, particularly those involving authentication, encountering issues can be frustrating. This is especially true when you are updating an aging application, like transitioning from .NET Core 1.1 to .NET 8.0. One common error developers face during this transition is the message:

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Let's explore the root cause of this problem and how to debug it effectively.

Understanding the Problem

You're attempting to validate AWS Cognito bearer tokens, but despite setting up its issuer properly, the authentication is failing. You might have already adjusted the logging level to trace and configured various token validation parameters, but if the trace output is minimal or uninformative, it's time to dive deeper.

Key Points to Check

Here’s a checklist of essential items to verify before implementing deeper debugging techniques:

Issuer Configuration: Ensure that the issuer URL matches the iss field in the decoded JWT exactly.

Token Validation Parameters: Properly set the token validation parameters within the AddJwtBearer() configuration.

Logging Levels: Confirm that logging is properly set up to provide the most detail possible during debugging.

Implementing JWT Bearer Authentication

When setting up JWT Bearer authentication in .NET 8.0, follow these organized steps:

Step 1: Configuration Setup

Your services should be configured correctly in the Startup.cs or within the Program.cs file. Use the following template as a reference for setting up the authentication scheme and JWT Bearer options:

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Step 2: Fine-Tuning Token Validation

Clock Skew: Set the ClockSkew parameter according to your needs. A few minutes can avoid issues with clock discrepancies between servers.

Issuer and Audience: Ensure both ValidIssuer and ValidAudiences are set according to the specific details from your AWS Cognito setup.

Signing Keys: Validate signing keys to ensure the tokens are signed correctly. Without this, tokens might be considered invalid.

Step 3: Increase Logging and Traceability

In your logging configuration, verify you have set options for increased detail:

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These values help log any exceptions or issues related to the token validations, which might further guide the debugging process.

Custom Passthrough Class for Deeper Investigation

If you continue to struggle with identifying the exact cause of the "not authenticated" message, consider creating a custom passthrough class to log parameters and track the flow more effectively.

Example Custom Class

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Integrate your custom events class into your JWT configuration to gain better insights into the authentication flow.

Conclusion

By following the structured setup outlined above, you can diagnose and troubleshoot your JWT Bearer authentication issues effectively. Remember to check your configurations, implement detailed logging, and consider custom approaches to trace failures. With these strategies, you’ll enhance the likelihood of a smooth transition to .NET 8.0 while successfully validating AWS Cognito bearer tokens.