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Create a policy for the AWS S3 bucket

In this article, we will create a policy for the AWS S3 bucket.

Scenario

Whenever we add any file in the S3 bucket, we have to make every object as public explicitly. To reduce this effort, we will create a policy so that every file added in the S3 bucket will be public.

Creation of bucket

First, create a new bucket. At the time of creation make sure that you perform these actions

Uncheck the "Block all public access" checkbox.
Check the checkbox "I acknowledge that the current settings might result in this bucket and the objects within becoming public."

Picture showing unchecking the checkbox Block all public access to make bucket public

Click to Enlarge

Create the policy JSON using the AWS policy generator tool

In the policy generator tool, enter the following values

Field	Value
Select Type of Policy	S3 Bucket Policy
Principal	*
Actions	GetObject

Picture showing selecting the action as GetObject

Click to Enlarge

In the "Amazon Resource Name" field, enter the ARN of the bucket.

Field	Value
Amazon Resource Name (ARN)	arn:aws:s3::/*

Click on the "Add Statement" button.

Picture showing adding the policy statement using the Add Statement button

Click to Enlarge

Finally, click on the "Generate Policy" button to generate the policy.

Picture showing the policy json created on click of the Generate Policy button

Click to Enlarge

Add the policy JSON in S3 bucket

To add the policy JSON, click on the "Properties" link. Click on the "Edit" button in the "Bucket policy" section.

Picture showing the Edit button for editing the bucket policy

Click to Enlarge

Paste the JSON and click on the "Save Changes" button. You will get the confirmation message.

Picture showing the confirmation message for the creation of bucket policy

Click to Enlarge

Now, whatever object you add in the bucket will be publicly visible.

Posted By -	Karan Gupta

Posted On -	Saturday, September 25, 2021

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