Amazon S3 Block Public Access in layman 2020-09-21

Block Public Access is a feature on Amazon S3 that allows us to prevent public access to an S3 bucket easily.

After reading and churning through its official documentation, here is a layman explanation for each setting in Block Public Access, when enabled.

• BlockPublicAcls. Prevents you from adding ACLs that grant public access to an S3 bucket.

• IgnorePublicAcls. Renders all buckets’ ACLs that grant public access ineffective.

• BlockPublicPolicy. Prevents you from adding a bucket policy that grants public access to an S3 bucket.

• RestrictPublicBuckets. Renders all buckets’ policies that grant public access ineffective. If a bucket has a policy that makes it public, it will also disable cross-account access to the bucket.