AWS IAM Permission Management Guide — How to Structure Users, Roles, and Policies

Why IAM Is Hard

In AWS, permission design is one of the most frequent sources of security incidents and operational confusion.

Typical anti-patterns:

IAM is not just an access feature. It is a system for defining security boundaries.

An identity for a person or long-lived account.

In modern AWS environments, direct long-lived user permissions are often less desirable than SSO or role assumption.

A way to assign common policies to multiple users.

The most important IAM building block.

Roles are assumed temporarily by:

The actual permission document that allows or denies actions on resources.

A practical approach is to define permissions by real tasks.

For a deployment role, ask:

Then grant only those actions.

Avoid patterns like:

{
  "Effect": "Allow",
  "Action": "*",
  "Resource": "*"
}

A practical pattern:

Direct broad production access for many users should be avoided whenever possible.

Instead of one giant shared role, define service-specific roles such as:

That makes growth and auditing far easier.

One of the most dangerous patterns is giving GitHub Actions or Jenkins broad administrative access.

A better approach is OIDC-based role assumption with tight repository conditions.

That avoids keeping static AWS keys in repository secrets.

Strong IAM is much easier when environments are separated by account:

This reduces blast radius and improves audit clarity.

IAM design should be evaluated together with these controls.

Good IAM design is not just a set of policies. It is an operating model.

Strong IAM systems: