Block public ACLs on objects or buckets

block_all_public_acls

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Deny",
            "Principal": "*",
            "Action": [
                "s3:PutBucketAcl",
                "s3:PutObjectAcl",
                "s3:PutObjectVersionAcl"
            ],
            "Resource": [
                "arn:aws:s3:::bucket_name",
                "arn:aws:s3:::bucket_name/*"
            ],
            "Condition": {
                "StringEquals": {
                    "s3:x-amz-acl": [
                        "public-read",
                        "public-read-write",
                        "authenticated-read"
                    ]
                }
            }
        },
        {
            "Effect": "Deny",
            "Principal": "*",
            "Action": [
                "s3:PutBucketAcl",
                "s3:PutObjectAcl",
                "s3:PutObjectVersionAcl"
            ],
            "Resource": [
                "arn:aws:s3:::bucket_name",
                "arn:aws:s3:::bucket_name/*"
            ],
            "Condition": {
                "StringEquals": {
                    "s3:x-amz-grant-read": [
                        "uri=http://acs.amazonaws.com/groups/global/AllUsers",
                        "uri=http://acs.amazonaws.com/groups/global/AuthenticatedUsers"
                    ]
                }
            }
        },
        {
            "Effect": "Deny",
            "Principal": "*",
            "Action": [
                "s3:PutBucketAcl",
                "s3:PutObjectAcl",
                "s3:PutObjectVersionAcl"
            ],
            "Resource": [
                "arn:aws:s3:::bucket_name",
                "arn:aws:s3:::bucket_name/*"
            ],
            "Condition": {
                "StringEquals": {
                    "s3:x-amz-grant-write": [
                        "uri=http://acs.amazonaws.com/groups/global/AllUsers",
                        "uri=http://acs.amazonaws.com/groups/global/AuthenticatedUsers"
                    ]
                }
            }
        },
        {
            "Effect": "Deny",
            "Principal": "*",
            "Action": [
                "s3:PutBucketAcl",
                "s3:PutObjectAcl",
                "s3:PutObjectVersionAcl"
            ],
            "Resource": [
                "arn:aws:s3:::bucket_name",
                "arn:aws:s3:::bucket_name/*"
            ],
            "Condition": {
                "StringLike": {
                    "s3:x-amz-grant-read-acp": [
                        "uri=*"
                    ]
                }
            }
        },
        {
            "Effect": "Deny",
            "Principal": "*",
            "Action": [
                "s3:PutBucketAcl",
                "s3:PutObjectAcl",
                "s3:PutObjectVersionAcl"
            ],
            "Resource": [
                "arn:aws:s3:::bucket_name",
                "arn:aws:s3:::bucket_name/*"
            ],
            "Condition": {
                "StringLike": {
                    "s3:x-amz-grant-write-acp": [
                        "uri=*"
                    ]
                }
            }
        },
        {
            "Effect": "Deny",
            "Principal": "*",
            "Action": [
                "s3:PutBucketAcl",
                "s3:PutObjectAcl",
                "s3:PutObjectVersionAcl"
            ],
            "Resource": [
                "arn:aws:s3:::bucket_name",
                "arn:aws:s3:::bucket_name/*"
            ],
            "Condition": {
                "StringLike": {
                    "s3:x-amz-grant-full-control": [
                        "uri=*"
                    ]
                }
            }
        },
        {
            "Effect": "Deny",
            "Principal": "*",
            "Action": ["s3:PutObjectACL",
                "s3:PutObjectVersionAcl"],
            "Resource": "arn:aws:s3:::bucket_name/*",
            "Condition": {
                "Null": {
                    "s3:x-amz-grant-write-acp": "true",
                    "s3:x-amz-acl": "true",
                    "s3:x-amz-grant-read": "true",
                    "s3:x-amz-grant-write": "true",
                    "s3:x-amz-grant-read-acp": "true",
                    "s3:x-amz-grant-full-control": "true"
                }
            }
        }
    ]
}