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What is AWS IAM and what fundamental problem does it solve for controlling access to AWS resources? What is the difference between an IAM user, an IAM group, and an IAM role? How do IAM policies use the combination of effect, action, resource, and condition elements to precisely define permissions? How does IAM policy evaluation logic determine the final outcome when a user has multiple applicable policies, including identity based and resource based policies? How does IAM support federated identity and single sign on integration with external identity providers like corporate Active Directory or a SAML based provider? How should an organization design a comprehensive IAM governance strategy combining permission boundaries, service control policies, and regular access reviews across a growing organization?
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What is the principle of least privilege in IAM, and what practical strategies help apply it effectively?

Intermediate

Answer

The principle of least privilege means granting only the exact minimum permissions a user, role, or application actually needs to perform its intended function, and nothing more, and practical strategies for applying it include starting with a minimal set of permissions and expanding only as genuinely needed, using IAM Access Analyzer to identify unused permissions that could be safely removed, and preferring specific resource level permissions over broad wildcard permissions whenever possible.
aws accessanalyzer list-findings --analyzer-arn arn:aws:access-analyzer:us-east-1:123456789012:analyzer/my-analyzer
Real-world example A security team uses IAM Access Analyzer to discover that a specific application role had been granted broad administrative permissions it never actually used, and narrows that role down to only the handful of specific actions the application genuinely requires.

Common follow-ups: How does IAM Access Analyzer determine which permissions are actually unused?;What is a reasonable process for periodically reviewing and tightening overly broad permissions?

AWS Security Hub & GuardDuty;AWS CloudTrail & Auditing
All 7 IAM questions