Скачать или смотреть Troubleshooting the required audience is missing Error in Spring Backend with Keycloak on Kubernetes

Discover solutions to the `HTTP ERROR 401` caused by missing audience in your Spring backend deployed on Kubernetes with Keycloak authentication.
---
This video is based on the question https://stackoverflow.com/q/64732832/ asked by the user 'Mike K.' ( https://stackoverflow.com/u/8026433/ ) and on the answer https://stackoverflow.com/a/64778434/ provided by the user 'Cameron' ( https://stackoverflow.com/u/13314704/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Getting a "required audience is missing" when trying to access my Spring backend deployed on a K8s/Argocd server

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Troubleshooting the required audience is missing Error in Spring Backend with Keycloak on Kubernetes

When deploying a Java Spring backend protected by Keycloak for authentication, developers occasionally run into issues that can be poor frustrating. One such issue is the error message: This page isn’t working. HTTP ERROR 401, followed by backend logs that indicate Bearer error="invalid_token", error_description="An error occurred while attempting to decode the Jwt: The required audience is missing". This can lead to confusion when you believe everything has been set up correctly. In this guide, we will guide you through understanding the problem and provide potential solutions to get your application running smoothly.

Understanding the Problem

The error you are encountering can occur for several reasons, often related to the configuration between your Spring application, Keycloak, and your Kubernetes deployment. Common causes of the required audience is missing error include:

Incorrect Client ID: The client might be configured incorrectly within Keycloak or your Spring application.

JWT Token Issues: The received JWT token from Keycloak is not decoded properly due to missing audience parameters.

Misconfigured Network Policies: Additional authorization settings in your Kubernetes configuration could be interfering with token verification.

Ensuring you address each potential issue is crucial as they all play a part in the authentication flow.

Step-by-Step Solution

1. Verify Keycloak Configuration

Client ID: Ensure your client-id and client-secret settings in the application.yml file match the ones defined in Keycloak.

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

2. Check the JWT Audience

The JWT token generated by Keycloak must include an audience that matches your backend service’s expected audience. Review the settings in Keycloak for your realm and client to ensure you are appropriately setting the audience in the tokens.

3. Review Kubernetes Ingress Configuration

Ensure that your Virtual Service in the Istio configuration does not unintentionally alter the traffic flow leading into the backend service.

Here is an overview of the Virtual Service you might be using:

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

Ensure that no extra configurations are being injected through policies or notations that could lead to unexpected behaviors.

4. Debugging Steps

Check Logs: Look into both Keycloak and Spring backend logs for more detailed error messages that may provide hints.

Token Validation: Use tools like JWT.io to decode your JWT and examine its claims, especially the audience (aud) claim.

5. Additional Considerations

If the problem continues after following the above steps, consider:

Recreating the Keycloak client.

Restarting the Kubernetes pods to ensure fresh configurations.

Adjusting the configuration parameters as needed based on debugging outputs.

Conclusion

The required audience is missing error can be resolved by carefully examining your Keycloak, Spring backend, and Kubernetes configurations. By following the outlined steps—verifying configurations, checking the JWT audience, reviewing ingress traffic rules, and debugging effectively—you should be able to overcome this issue and restore your application functionality. Always double-check configurations to prevent these common pitfalls!

If you have additional insights or solutions regarding this issue, please share your tips in the comments below! Your experiences can greatly assist others facing similar challenges.