AWS IAM
AWS Identity and Access Management (IAM) lets you securely control access to AWS services and resources. Create users, groups, and roles with fine-grained permissions.
What is IAM? (Simple Explanation)
Think of IAM like a security badge system for a building. Each person (user) and service (role) gets a badge that says exactly which rooms (AWS services) they can enter and what they can do inside.
When Would You Use IAM?
- Least-privilege access control
- Federated identity for workforce & workloads
- Cross-account access delegation
- Service-to-service authorization
Who Uses IAM?
From startups to enterprises, IAM powers:
What Makes IAM Powerful
IAM Pricing & Free Tier
Core security services (IAM, KMS, CloudTrail, Shield Standard) are always free. Advanced features (GuardDuty, WAF, Shield Advanced) have per-usage pricing.
IAM Best Practices
- 1Enable MFA on all IAM users and root account
- 2Never use root account for daily tasks — create IAM users with least privilege
- 3Enable CloudTrail across all regions with log file validation
- 4Rotate access keys every 90 days and never commit them to source control
- 5Use IAM roles for EC2/Lambda/ECS instead of long-term access keys
Getting Started with IAM in 5 Minutes
- 1Open the AWS Console and navigate to IAM
- 2Review the default settings — most security services are pre-configured with best-practice defaults
- 3Define your policies, rules, or detection scope based on your environment
- 4Enable logging to CloudTrail and set up alerts to SNS for critical findings
IAM CLI Quick Reference
3 production-ready commands. Full CLI Library (225+ services) →
aws iam list-users --query 'Users[*].{Name:UserName,Created:CreateDate,Password:PasswordLastUsed}' --output tableList all IAM users with last password useaws iam list-roles --query 'Roles[*].{Name:RoleName,Arn:Arn,Trust:AssumeRolePolicyDocument.Statement[0].Principal}' --output tableList all IAM roles with trust policy principalaws iam get-account-authorization-details --query 'UserDetailList[*].{User:UserName,Policies:AttachedManagedPolicies[*].PolicyName}' --output tableAudit all users and their attached policiesPros & Cons of IAM
Pros
- IAM Roles for EC2, Lambda, ECS, and other services
- JSON policy language with condition keys
- IAM Access Analyzer for unintended access detection
- Organizations SCPs for account-wide guardrails
- IAM Identity Center (SSO) for workforce access
Cons
- ✕Proper IAM policy design has a steep learning curve — overly permissive policies are common
- ✕Root account is a single point of failure if MFA is lost
- ✕CloudTrail logs can become expensive at scale without lifecycle management
IAM vs Alternatives
IAM vs Organizations
Choose IAM for Least-privilege access control and Federated identity for workforce & workloads. It excels at iam roles for ec2, lambda, ecs, and other services.
Choose Organizations as an alternative when your requirements differ. Each service in the Security category serves different architectural patterns.
Services That Work with IAM
IAM is rarely used alone. It is typically combined with:
Compliance & Security
How AWS IAM fits into major compliance standards. Browse all 41 frameworks →
IAM configuration is audited by CIS Benchmarks v1.5–v3.0 for secure cloud defaults.
NIST 800-53IAM access controls, encryption, and audit logging map to NIST 800-53 AC, SC, and AU control families.
PCI DSS 4.0IAM encryption, access control, and logging support PCI DSS for cardholder data environments.
SOC 2IAM security, availability, and confidentiality controls evaluated under SOC 2 Trust Services Criteria.
ISO 27001IAM configuration and monitoring controls map to ISO 27001 Annex A information security management.
Frequently Asked Questions About IAM
What is AWS IAM?
AWS Identity and Access Management (IAM) lets you securely control access to AWS services and resources. Create users, groups, and roles with fine-grained permissions.
What is IAM used for?
IAM is commonly used for: Least-privilege access control; Federated identity for workforce & workloads; Cross-account access delegation; Service-to-service authorization. It's a core service in the security category of AWS.
Is IAM free?
Core security services (IAM, KMS, CloudTrail, Shield Standard) are always free. Advanced features (GuardDuty, WAF, Shield Advanced) have per-usage pricing.
What are the key features of IAM?
IAM's most important capabilities include: IAM Roles for EC2, Lambda, ECS, and other services. JSON policy language with condition keys. IAM Access Analyzer for unintended access detection. Organizations SCPs for account-wide guardrails. IAM Identity Center (SSO) for workforce access. Each of these is designed to help teams least-privilege access control.
How does IAM compare to alternatives?
IAM competes with both AWS-native alternatives (Organizations, KMS, CloudTrail) and third-party equivalents. The right choice depends on your specific requirements for scalability, cost, and operational overhead. See the comparisons section below for detailed guidance.
Which compliance frameworks apply to IAM?
CIS AWS v3.0: IAM configuration is audited by CIS Benchmarks v1.5–v3.0 for secure cloud defaults. NIST 800-53: IAM access controls, encryption, and audit logging map to NIST 800-53 AC, SC, and AU control families. PCI DSS 4.0: IAM encryption, access control, and logging support PCI DSS for cardholder data environments. SOC 2: IAM security, availability, and confidentiality controls evaluated under SOC 2 Trust Services Criteria. ISO 27001: IAM configuration and monitoring controls map to ISO 27001 Annex A information security management.
People also search for
Was this page helpful?
Ready to secure your IAM configuration?
Pavora continuously monitors your AWS IAM for misconfigurations, compliance violations, and security risks.