Lion Cipher Lab
Secure an AWS S3 bucket, step by step (your own free-tier account)
- Cloud Security
- Beginner
- ~50 min
- Free · no account required
Why it matters
Amazon S3 is where a huge share of the world's cloud data lives -- backups, images, logs, application files -- and it is also behind a long line of headline data leaks. Almost none of those were clever break-ins. They were misconfigurations: a storage bucket left open so that anyone on the internet could read it, no password required. That is the single most common way cloud data spills, and it usually happens by accident, because making something public in the cloud can be one click or one careless line of policy. The good news is that the fix is equally concrete: S3 gives you a stack of…
What you'll learn
- what cloud object storage is: a bucket is a container, an object is a file plus its metadata
- understanding the classic 'public bucket' data leak -- how storage gets accidentally exposed to the whole internet
- creating a free-tier AWS account and a first S3 bucket, and proving it is private by default
- turning on S3 Block Public Access -- the account- and bucket-level switch that stops a bucket from ever being made public
- confirming encryption at rest (SSE-S3) so stored objects are unreadable without AWS decrypting them for authorized callers
- enabling versioning (keep old copies so an overwrite or delete is recoverable) and server access logging (a record of who requested what)
- writing a least-privilege bucket policy that grants only the access actually needed, denies the rest, and can require encrypted transport
- cleaning up safely: emptying and deleting the bucket so no charges accrue, on an account you own, using example data only
Steps in this lab
- Read this first: your own account, example data only, delete when done
- What S3 is -- buckets, objects, and the 'public bucket' leak
- Create a free-tier AWS account (and secure the root login)
- Create your first bucket
- Prove the bucket is private by default
- Turn on Block Public Access (the master safety switch)
- Confirm encryption at rest (and understand what it does)
- Enable versioning (so a mistake is recoverable)
- Enable server access logging (so you can see who asked for what)
- Write a least-privilege bucket policy
- Clean up: empty and delete the bucket so nothing accrues
- Why these few controls make you a cloud data defender