AWS Documentation » AWS CloudFormation » User Guide » Template Reference » AWS Resource and Property Types Reference » Amazon Simple Storage Service Resource Types Reference » AWS::S3::BucketPolicy

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AWS::S3::BucketPolicy

The AWS::S3::BucketPolicy type applies an Amazon S3 bucket policy to an Amazon S3 bucket.

AWS::S3::BucketPolicy Snippet: Declaring an Amazon S3 Bucket Policy

Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

JSON

{
   "Type" : "AWS::S3::BucketPolicy",
   "Properties" : {
      "Bucket" : String,
      "PolicyDocument" : JSON
   }
}     

YAML

Type: AWS::S3::BucketPolicy
Properties: 
  Bucket: String
  PolicyDocument: JSON

Properties

Bucket

The name of the Amazon S3 bucket to which the policy applies.

Required: Yes

Type: String

You cannot update this property. If you want to add or remove a bucket from a bucket policy, you must modify your AWS CloudFormation template by creating a new bucket policy resource and removing the old one. Then use the modified template to update your AWS CloudFormation stack.

PolicyDocument

A policy document containing permissions to add to the specified bucket. For more information, see Access Policy Language Overview in the Amazon Simple Storage Service Developer Guide.

Required: Yes

Type: JSON object

Update requires: No interruption

Examples

Bucket policy that allows GET requests from specific referers

The following sample is a bucket policy that is attached to the myExampleBucket bucket and allows GET requests that originate from www.example.com and example.com:

JSON

"SampleBucketPolicy" : {
  "Type" : "AWS::S3::BucketPolicy",
  "Properties" : {
    "Bucket" : {"Ref" : "myExampleBucket"},
    "PolicyDocument": {
      "Statement":[{
	    "Action":["s3:GetObject"],
	    "Effect":"Allow",
	    "Resource": { "Fn::Join" : ["", ["arn:aws:s3:::", { "Ref" : "myExampleBucket" } , "/*" ]]},
	    "Principal":"*",
        "Condition":{
          "StringLike":{
            "aws:Referer":[
              "http://www.example.com/*",
              "http://example.com/*"
            ]
          }
        }
      }]
    }
  }
}

YAML

SampleBucketPolicy: 
  Type: AWS::S3::BucketPolicy
  Properties: 
    Bucket: 
      Ref: "myExampleBucket"
    PolicyDocument: 
      Statement: 
        - 
          Action: 
            - "s3:GetObject"
          Effect: "Allow"
          Resource: 
            Fn::Join: 
              - ""
              - 
                - "arn:aws:s3:::"
                - 
                  Ref: "myExampleBucket"
                - "/*"
          Principal: "*"
          Condition: 
            StringLike: 
              aws:Referer: 
                - "http://www.example.com/*"
                - "http://example.com/*"