How to restrict access to only splunk cloud to the S3 Bucket in AWS?

[blbr123]

Hi All,

I am trying onboard AWS S3 Bucket logs to splunk cloud using the ARN name,

Question from my client is how to restrict access to only splunk cloud to the S3 Bucket in their AWS and no one else should be able to access the S3 Bucket using the ARN name?