cloudflare_s3_whitelist.md

Cloudflare S3 bucket permissions

The logic is convoluted for S3 bucket ACLs. You have to use double negative logic...

Copy and paste this example, keeping cloudflare IP addresses as you need. The following website is helpful: cloudflare IP addresses

{
    "Version": "2008-10-17",
    "Id": "S3PolicyIdBucketCloudFlareIpAddressWhitelist",
    "Statement": [
        {
            "Sid": "IPDeny",
            "Effect": "Deny",
            "Principal": {
                "AWS": "*"
            },
            "Action": "s3:*",
            "Resource": "arn:aws:s3:::bucketname/*",
            "Condition": {
                "NotIpAddress": {
                    "aws:SourceIp": [
                        "103.21.244.0/22",
                        "103.22.200.0/22",
                        "103.31.4.0/22",
                        "104.16.0.0/12",
                        "108.162.192.0/18",
                        "131.0.72.0/22",
                        "141.101.64.0/18",
                        "162.158.0.0/15",
                        "172.64.0.0/13",
                        "173.245.48.0/20",
                        "188.114.96.0/20",
                        "190.93.240.0/20",
                        "197.234.240.0/22",
                        "198.41.128.0/17"
                    ]
                }
            }
        },
        {
            "Sid": "PublicReadForGetBucketObjects",
            "Effect": "Allow",
            "Principal": "*",
            "Action": "s3:GetObject",
            "Resource": "arn:aws:s3:::bucketname/*"
        }
    ]
}