We're trying to access a client's S3 bucket from our own AWS account, but we're running into a permissions issue. The client's bucket is encrypted using standard AWS encryption, and although they granted us access, we're still unable to access the files. We're getting an error message stating that our user is not authorized to perform the `kms:Decrypt` action due to a potential lack of resource-based policies or because the resource doesn't exist in our region. We're setting up our S3 client with credentials for the US-EAST-1 region, while the client's bucket is located in US-WEST-1. Is the region difference causing this problem? Can we configure access across different regions?
3 Answers
Actually, the error message gives a clear hint about what's wrong. You need to adjust the policy on the KMS key to allow decryption. If the client is using an AWS-managed key (like the default S3 one), you won't be able to edit it, which could restrict your access. They might need to switch to a customer-managed key for better control.
To successfully access the S3 bucket, the client's bucket must use a customer-managed KMS key for encryption. Managed keys allow more flexibility with cross-account access. If they're using the automatic AWS key, that's likely part of the problem.
The good news is that IAM roles and users aren't tied to specific regions, so the region shouldn't be the issue here. The error implies that your permissions to decrypt the bucket content are insufficient, not that you're restricted by the region itself.
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