Cloud IAM: Roles, Policies, and Least Privilege
Design minimal-permission IAM policies and use role-based access control in cloud environments.
Cloud IAM: Roles, Policies, and Least Privilege is a free Cyber Security Academy lesson on CoddyKit — lesson 1 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Cyber Security Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Cloud IAM Fundamentals
Identity and Access Management (IAM) in cloud environments controls who can do what to which resources. The three pillars are: principals (users, groups, service accounts), permissions (individual actions), and policies (documents binding principals to permissions).
AWS IAM: Users, Roles, and Policies
AWS IAM policies are JSON documents granting or denying API actions on resources. Roles are identities assumed by services (EC2, Lambda) or federated users. Prefer roles over long-lived access keys for EC2 instances.
{
"Version": "2012-10-17",
"Statement": [{
"Effect": "Allow",
"Action": ["s3:GetObject"],
"Resource": "arn:aws:s3:::my-bucket/*"
}]
}Principle of Least Privilege
Grant only the permissions needed to accomplish a specific task. Start with zero permissions and add only what is required. Review and reduce permissions over time. Unused permissions are an unnecessary attack surface.
AWS Permission Boundaries
Permission boundaries set the maximum permissions a principal can have, regardless of attached policies. Use them to delegate IAM administration safely — developers can create roles but cannot exceed the boundary you define.
Service Accounts in GCP and Azure
GCP uses service accounts with key files or Workload Identity Federation. Azure uses managed identities (system-assigned and user-assigned) that eliminate the need for credential management — the platform handles token rotation automatically.
IAM Access Analyzer
AWS IAM Access Analyzer continuously monitors resource policies and reports externally shared resources (S3 buckets, KMS keys, Lambda functions). It identifies unintended public or cross-account access automatically.
Attribute-Based Access Control (ABAC)
ABAC extends RBAC by granting permissions based on resource and principal tags/attributes. A policy allowing access to resources tagged with the same project value as the principal scales better than thousands of individual role assignments.
Credential Rotation and Lifecycle
Rotate IAM access keys every 90 days. Enable MFA for all human users. Detect unused credentials with Access Advisor and remove them. Monitor for root account usage — it should almost never appear in CloudTrail logs.
Privilege Escalation Risks
IAM misconfigurations enable privilege escalation: iam:PassRole + ec2:RunInstances lets an attacker launch an EC2 with an admin role. iam:CreateAccessKey lets an attacker add keys to any user. Regular escalation path analysis is essential.
Cross-Account Access
Cross-account roles allow one AWS account to access resources in another. Define a trust policy on the role in the target account specifying the source account and optionally an external ID as a confused deputy mitigation.
IAM Governance and Auditing
Generate IAM credential reports monthly. Use AWS Config rules to detect non-compliant IAM configurations. Integrate IAM findings with a SIEM for centralized policy violation alerting. Enforce SCP guardrails at the organization level.
Knowledge Check
What is the purpose of a permission boundary in AWS IAM?
Summary
Cloud IAM governs access through principals, policies, and roles. Applying least privilege, using managed identities, enabling access analysis tools, and regularly auditing credential usage are essential practices for secure cloud environments.
Frequently asked questions
Is the “Cloud IAM: Roles, Policies, and Least Privilege” lesson free?
Yes — the full text of “Cloud IAM: Roles, Policies, and Least Privilege” is free to read here on the web, and the Cyber Security Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Cyber Security Academy course, upgrade to CoddyKit PRO.
What will I learn in “Cloud IAM: Roles, Policies, and Least Privilege”?
Design minimal-permission IAM policies and use role-based access control in cloud environments. You practise Cyber Security Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Cyber Security Academy?
No prior experience is required. Cyber Security Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 1 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Cloud IAM: Roles, Policies, and Least Privilege” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Cyber Security Academy lesson?
Yes. Every Cyber Security Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- Cloud IAM: Roles, Policies, and Least Privilege
- Common Cloud Misconfigurations
- Cloud Security Posture Management (CSPM)
- Container and Kubernetes Security