aws_sns_topic_policy.tpl

{
    "Id": "TSTopicPolicy",
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "AWSCloudTrailSNSPolicy",
            "Action": "SNS:Publish",
            "Effect": "Allow",
            "Principal": {
                "Service": "cloudtrail.amazonaws.com"
            },
            "Resource": "*"
        }
    ]
}