An S3 Bucket policy that denies any access to the S3 bucket that is not encrypted in-transit (uses HTTP instead of HTTPS) .

 
Tags
API and CLI Access
Console Access
Source
AWS Blog
Missing Parameters
{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Principal": {
                "AWS": "*"
            },
            "Action": [
                "s3:*"
            ],
            "Resource": [
                "arn:aws:s3:::/*",
                "arn:aws:s3:::"
            ],
            "Effect": "Deny",
            "Condition": {
                "Bool": {
                    "aws:SecureTransport": "false"
                }
            }
        }
    ]
}
Customize Policy
* Required field