Unit 4: Identity and Access Management

This curriculum provides a comprehensive roadmap for mastering Identity and Access Management (IAM) within the context of the AWS Certified Security - Specialty (SCS-C03) certification. Students will progress from foundational authentication concepts to complex cross-account authorization and automated governance.

Prerequisites

Before beginning this unit, students should possess the following foundational knowledge and tools:

• AWS Core Knowledge: Understanding of the AWS Shared Responsibility Model and basic global infrastructure (Regions/AZs).
• IAM Fundamentals: Previous experience creating IAM Users, Groups, and Roles in the AWS Management Console.
• JSON Literacy: Ability to read and write JSON, as it is the primary language for AWS IAM policies.
• Technical Setup:
  • An active AWS Account (Free Tier is sufficient).
  • AWS CLI installed and configured on a local machine.
  • Access to a virtual or hardware MFA device (e.g., Google Authenticator).

Module Breakdown

Learning Objectives per Module

Module 4.1: Authentication Strategies

• Design and establish identity solutions for human and system authentication using AWS IAM Identity Center.
• Configure Multi-Factor Authentication (MFA) and understand its enforcement via policies.
• Implement temporary credential mechanisms using AWS Security Token Service (STS) (e.g., AssumeRole).
• Integrate Amazon Cognito for customer-facing application identity pools.

Module 4.2: Authorization Strategies

• Design Attribute-Based Access Control (ABAC) strategies using resource and principal tags.
• Interpret and implement Role-Based Access Control (RBAC) for organizational scaling.
• Apply the Principle of Least Privilege using Permission Boundaries and Session Policies.

Module 4.3: Troubleshooting & Governance

• Analyze authorization failures using the IAM Policy Simulator.
• Investigate unintended permissions and resource exposure using IAM Access Analyzer.
• Audit identity-related events through AWS CloudTrail logs.

Visual Anchors

Authentication Flow: STS AssumeRole

Policy Evaluation Logic

\begin{tikzpicture}[node distance=2cm] \draw[thick, fill=blue!10] (0,0) circle (3cm); \draw[thick, fill=red!10] (0,0) circle (2cm); \draw[thick, fill=green!10] (0,0) circle (1cm); \node at (0,3.3) {\textbf{Explicit Deny (Always Wins)}}; \node at (0,2.3) {\textbf{Explicit Allow}}; \node at (0,0) {\textbf{Default Deny}}; \end{tikzpicture}

Success Metrics

To demonstrate mastery of Unit 4, the learner must be able to:

1. Resolve "Access Denied" Errors: Identify the specific policy (SCP, Identity-based, Resource-based) causing an authorization failure within 5 minutes using CloudTrail.
2. Implement ABAC: Successfully create a policy that allows a developer to start/stop only EC2 instances that have a Project tag matching the user's Project tag.
3. Audit Exposure: Use IAM Access Analyzer to generate a report of all S3 buckets accessible by external AWS accounts and remediate non-compliant ones.
4. Zero-Long-Term Credentials: Demonstrate a system architecture where no IAM User Access Keys are used, replaced entirely by IAM Roles and STS.

Real-World Application

• Enterprise Scaling: Using AWS IAM Identity Center to manage thousands of employees across 100+ AWS accounts with a single set of corporate credentials (SSO).
• Secure Mobile Apps: Utilizing Amazon Cognito to allow millions of users to sign in to a mobile app via Google or Apple ID while securely accessing specific S3 folders for their data.
• Regulatory Compliance: Meeting SOC2 or HIPAA requirements by enforcing MFA and ensuring that every API call is logged and traceable back to a specific human or system identity.

[!IMPORTANT] IAM is the "Zero Trust" perimeter of AWS. Unlike traditional networking, identity is checked at every single request. Mastering this unit is the most critical step for any AWS Security Specialist.