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IAM & Access Control

SSO, Least-Privilege, and SaaS Auth Without Audit Findings

Least-privilege patterns, workforce SSO with identity propagation, customer auth, and fine-grained Cedar-policy authorization.

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IAM is where most AWS environments quietly break least-privilege. The guides below cover production-grade IAM patterns, IAM Identity Center for workforce SSO and identity propagation into Q Business / Redshift / QuickSight / S3 Access Grants, fine-grained authorization with Verified Permissions and Cedar 4.7 (with native API Gateway authorizers and AppSync `BatchIsAuthorized` for graphs), and SaaS-grade customer auth with Cognito on its 2024-revised Lite/Essentials/Plus pricing tiers — covering federation, MFA, and tenant isolation.

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Compliance Frameworks

Framework-by-framework guidance — what auditors expect, what AWS provides, and what your team configures.

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FAQ

Frequently asked questions about iam & access control

When do we need IAM Identity Center vs Amazon Cognito?
They solve different problems. IAM Identity Center is the AWS-native workforce identity service: it federates your employees (from Okta, Microsoft Entra ID, Google Workspace, or its own directory) into AWS accounts, applications, and identity-aware services like Q Business, Redshift, QuickSight, and S3 Access Grants — propagating the human identity end-to-end so audit logs show who, not which IAM role. Cognito is a customer-facing user pool for your SaaS application end users — sign-up, sign-in, MFA, social/SAML federation, and JWT issuance. Most platforms run both: Identity Center for staff and admins, Cognito for tenants. They are not interchangeable, and AWS has not merged User Pools and Identity Pools as some 2023 commentary suggested.
How do we federate AWS Console + CLI access from Okta or Entra ID?
Connect your IdP to IAM Identity Center via SAML 2.0 or SCIM (for automatic group/user provisioning). Define permission sets (managed-policy collections plus inline policies and a session duration up to 12 hours) and assign them to AWS accounts via groups. Users get the AWS access portal — a single landing page that issues short-lived credentials for the console and the AWS CLI v2 (`aws configure sso`). Avoid the legacy pattern of long-lived IAM users; the IAM Access Analyzer external-access findings will surface them and most auditors will flag them too. ABAC works on top of permission sets when you tag both the principal (via SCIM attribute mapping) and the resource.
Does ABAC actually work in production, or is RBAC simpler?
ABAC works at scale once tag governance is enforced. The pattern: enforce mandatory tags on every resource via Service Control Policies (e.g. `aws:ResourceTag/CostCenter` and `aws:ResourceTag/Environment` required on creation) and on every principal via permission-set session tags. Then write a small number of permission sets that read those tags (`Condition: StringEquals: aws:ResourceTag/Environment: ${aws:PrincipalTag/Environment}`). New teams or environments do not need new policies — they need a tag. The first 90 days are tag-cleanup hell; after that, ABAC scales further than RBAC and audits cleaner because the policy text does not enumerate every team.

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