AWS IAM

AWS Identity and Access Management, commonly called AWS IAM, is an AWS account feature for controlling authentication and authorization. It manages identities, credentials, roles, groups, and policies that determine access to AWS services and resources.

IAM supports human users, workloads, federated identities, and AWS services. Administrators can grant permissions with JSON policies, use temporary credentials, and apply conditions such as resource, action, tag, or organization requirements.

AWS IAM supports fine-grained permissions through identity-based and resource-based policies. Administrators can define allowed actions, target resources, and conditions for each access request.

IAM roles provide temporary credentials for users, applications, and AWS services. IAM also supports federation, multi-factor authentication, attribute-based access control, permissions boundaries, service control policies, and resource control policies.

IAM Access Analyzer helps identify unintended external access and supports policy validation. IAM Roles Anywhere extends role-based access to workloads outside AWS through X.509 certificates.

The service integrates with AWS Organizations, AWS CloudTrail, AWS Security Token Service, and a wide range of AWS services. AWS IAM Identity Center provides a separate centralized workforce access experience for multiple AWS accounts and applications.

AWS IAM is offered at no additional charge. Users pay for the AWS services accessed through IAM identities or temporary credentials, not for the core IAM service itself.

IAM Access Analyzer includes no-charge external access analysis, while some unused access analysis and customer policy checks can incur charges. AWS does not provide a separate IAM trial because IAM is included with an AWS account.

Pros:

• No separate charge for the core service.
• Detailed control over AWS actions, resources, and conditions.
• Supports roles and temporary credentials for workloads.
• Integrates broadly with AWS services and Organizations.
• Provides federation, MFA, ABAC, policy validation, and access analysis.

Cons:

• Policy syntax and permission evaluation require specialized knowledge.
• Large environments can become difficult to audit and maintain.
• IAM primarily governs AWS resources rather than serving as a general-purpose SaaS identity platform.
• IAM configuration changes can be eventually consistent across AWS infrastructure.

Common alternatives depend on the environment. Microsoft Entra ID and Okta Workforce Identity focus on workforce identity, federation, and application access across heterogeneous environments. Google Cloud IAM provides comparable permissions management for Google Cloud resources.

AWS IAM Identity Center is a related AWS option for centralized workforce access across AWS accounts and applications. It does not replace the underlying IAM roles and policies used by AWS services.

Is AWS IAM free?
AWS IAM is available at no additional charge. Charges may apply to other AWS services accessed through IAM and to certain IAM Access Analyzer features.

Does AWS IAM have an API?
Yes. AWS provides an IAM Query API, AWS CLI commands, and SDKs for programmatic administration.

What platforms support AWS IAM?
IAM is accessed through the AWS Management Console, AWS CLI, APIs, and AWS SDKs. It is a cloud service rather than a standalone desktop application.

Does IAM support integrations?
Yes. IAM integrates with AWS services, AWS Organizations, CloudTrail, STS, and external identity providers through federation. IAM Identity Center adds integrations for supported directories and business applications.

Does AWS IAM offer a free trial?
There is no separate trial. IAM is a feature included with an AWS account at no additional charge.

What is the difference between IAM and IAM Identity Center?
IAM controls AWS identities, roles, policies, and resource permissions. IAM Identity Center focuses on centralized workforce access to multiple AWS accounts and applications.