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Learn how to troubleshoot and resolve `AuthorizationErrorException` when trying to publish a message from one AWS account to an SNS topic owned by another account, including necessary permissions and role configurations.
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Resolving AuthorizationErrorException When Publishing to an AWS SNS Topic Across Accounts

Publishing messages to AWS Simple Notification Service (SNS) topics can be straightforward - but issues can arise, especially when attempting to publish from one AWS account to a topic owned by another. One common error you may encounter during this process is the AuthorizationErrorException. In this guide, we'll explore how to troubleshoot and solve this problem effectively.

Understanding the Problem

You may be trying to publish a message from your AWS account (Account ID: 111222333) to an SNS topic that belongs to another AWS account (Account ID: 444555666). However, upon attempting to do so, you encounter the following error:

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

This error indicates that the permissions are not properly configured, either on your side (the publisher) or on the recipient's side (the SNS topic policy). Let's delve into resolving this issue step-by-step.

Step-by-Step Solution

1. Ensure IAM Role Configuration

When running your code on an EC2 instance, the instance uses an IAM role assigned to it via the instance profile. Follow these steps:

Check the attached IAM Role:

Log in to the AWS Management Console.

Navigate to the EC2 Dashboard.

Select your instance and check the IAM Role attached under the “Description” tab.

Update/Modify IAM Role if Necessary:

If your EC2 instance does not have an appropriate role, you can modify which role it uses from the EC2 console.

2. Permissions in Your IAM Role

The IAM role associated with your EC2 instance must have the necessary permissions to publish messages to the SNS topic. This includes:

SNS Publish Permissions:

Ensure that the role includes the following policy statement to allow sns:Publish:

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

3. Cross-Account SNS Topic Policy

The SNS topic in the other AWS account also needs to allow your EC2 instance's IAM role to publish messages. The topic policy should contain an allow statement that includes your IAM role. Here’s an example of such a policy:

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

4. Testing the Configuration

Once you have verified and made the appropriate adjustments, test the publishing operation again using the following sample code:

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

5. Run the Code

After implementing the above changes, run your code again to see if the issue is resolved. If you still encounter an error, double-check that there are no typos in your ARN, and ensure that both the IAM role and SNS topic policy are correctly configured.

Conclusion

By following the steps outlined above, you can effectively troubleshoot and resolve the AuthorizationErrorException when trying to publish messages from one AWS account to an SNS topic owned by another AWS account. It's essential to ensure that both the IAM role configurations and SNS topic policies align to permit cross-account access to avoid these authorization errors.

If you have any further questions or run into additional issues, feel free to reach out for assistance!