s3-bucket-public-read.json

{
  "Version":"2012-10-17",
  "Statement":[{
    "Sid":"PublicReadGetObject",
      "Effect":"Allow",
      "Principal": "*",
      "Action":["s3:GetObject"],
      "Resource":["arn:aws:s3:::[[YOUR-BUCKET-NAME]]/*"
      ]
    }
  ]
}