I'm currently troubleshooting an issue with AWS Simple Notification Service (SNS) and I can't determine if the problem lies with SNS or IAM permissions. I have a script that successfully creates an SNS topic and subscribes an email endpoint to it. The part where I call `CreateTopic` works without any issues, but when I attempt to subscribe, I frequently encounter authentication errors like 'InvalidClientTokenId' or 'AuthorizationError: User is not authorized to perform sns:Subscribe'. I've checked that the credentials I'm using are functional across other AWS services, the region is set correctly, and this is all being done in a dev/test environment. Is it possible that the IAM user has permission to create SNS topics but lacks the permissions needed for managing subscriptions? Any insight into what might be going wrong would be greatly appreciated.
2 Answers
You definitely need to make sure that all necessary permissions are granted for what you're trying to do. Since you're getting authorization errors while trying to subscribe, it seems like the IAM policy doesn't include the `sns:Subscribe` action. A quick fix while you're debugging is to temporarily give your app the `sns:*` permission so you can test everything out smoothly.
Yes, it is entirely possible for an IAM user to have permission to create SNS topics while lacking permission to manage subscriptions. I suggest checking the AWS documentation, particularly on the policy language and permissions for SNS. Understanding IAM is crucial for working with AWS properly. But whatever you do, make sure to revoke those access keys you posted earlier; they should be treated like passwords that should never be shared.
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