Role-based access control in AWS IAM: Principle of least privilege done right

IAM is the security foundation. Users get roles. Roles have policies. Policies grant permissions. Each person gets only what they need.

The structure

User: person or service.

Role: bundle of permissions.

Policy: document that defines permissions.

Resource: thing the policy applies to.

User → assumes role → gets permissions → can access resources.

Real example

Engineer role: EC2 read access, RDS read access, S3 write access to one bucket.

That engineer can view instances, read database configs, write logs to S3. Cannot delete instances, cannot modify RDS, cannot delete S3 buckets.

Principle of least privilege

Give every person the minimum permissions they need. Not "admin" access. Specific access.

Reduces blast radius if credentials are compromised. Attacker gets stolen creds, can only do what that role allows.

Audit

Review permissions quarterly. Who has what access? Do they still need it?

Remove old permissions. Contractors leave. Remove their access.

CloudTrail shows who did what. Use it to verify people did only what their roles allow.

Where Critical Cloud comes in

IAM gets complex at scale. 100+ users, 50+ roles, 1000+ policies. Tracking who has what is hard.

We map IAM roles and permissions. You see access clearly.

If IAM permission management is painful, see how Critical Support works.