Adding Bucket Policy on S3 Bucket

Sign in to the AWS Management Console and open the Amazon S3 console at https://console.aws.amazon.com/s3/.
In the Bucket name list, choose the name of the bucket that you want to create a bucket policy for or whose bucket policy you want to edit.
Choose Permissions, and then choose Bucket Policy.
In the Bucket policy editor text box, type or copy and paste a new bucket policy, or edit an existing policy. The bucket policy is a JSON file. The text you type in the editor must be valid JSON.
Choose Save

Some example policy:

Granting Read-Only Permission to an Anonymous User

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

Restricting Access to a Specific HTTP Referer condition key.

{
  "Version":"2012-10-17",
  "Id":"http referer policy example",
  "Statement":[
    {
      "Sid":"Allow get requests originating from www.example.com and example.com.",
      "Effect":"Allow",
      "Principal":"*",
      "Action":"s3:GetObject",
      "Resource":"arn:aws:s3:::examplebucket/*", "Condition":{ "StringLike":{"aws:Referer":["http://www.example.com/*","http://example.com/*"]} } } ] }

Adding Bucket Policy on S3 Bucket

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