Exploring Multi Account Security With AWS Control Tower

Welcome to this lesson on leveraging AWS Control Tower to implement multi-account security in cloud environments. This guide is part of our comprehensive series on cloud security best practices and provides step-by-step insights into how AWS Control Tower streamlines the management of multiple AWS accounts.

What is AWS Control Tower?

AWS Control Tower is a service that incorporates best practice configurations to help you quickly establish a secure and compliant landing zone for your organization. By integrating AWS Organizations, IAM Identity Center (formerly Single Sign-On), AWS Config, and Service Control Policies (SCPs), it simplifies the complex task of managing multiple AWS accounts.

Imagine setting up test, staging, and production environments, along with dedicated management, security, and logging accounts for CloudTrail—all with one centralized solution. AWS Control Tower makes this possible by ensuring that your organization follows a consistent security and governance structure.

Establishing a Landing Zone

Control Tower establishes a robust landing zone, which serves as the foundation for a well-architected multi-account environment. In this setup, you create an organization with a root account and multiple organizational units (OUs) such as production, staging, test, sandbox, and security. For example, the security OU typically includes specialized accounts for log archiving and auditing:

The image is a diagram of a "Control Tower" setup, showing a hierarchical structure with a "Root" at the top and various environments like Security, Sandbox, Test, Staging, and Prod below it. Each environment contains specific accounts or components, such as Log Archive and Audit Account under Security.

This structured approach ensures that audit logs and archived data are securely stored and protected from unauthorized modifications. Without such a centralized system, managing separate AWS accounts can become as complicated as coordinating multiple ships without a unified navigation system.

Guardrails: Prevention and Detection

AWS Control Tower incorporates two types of guardrails to maintain security and compliance:

Preventative Guardrails:
These guardrails actively block actions that might lead to security risks or compliance issues. For instance, they prevent the creation of public S3 buckets or the launching of EC2 instances without a key pair.
Detective Guardrails:
These guardrails configure tools like AWS Config and CloudTrail to monitor, log, and alert you about non-compliant activities. While they do not block the action, they provide crucial insights for forensic analysis and post-incident investigations.

The image illustrates AWS Control Tower Guardrails, featuring two categories: Preventive Guardrails and Detective Guardrails, each represented by icons.

The image illustrates the process of preventive and detective guardrails in AWS, showing how configurations are checked when a user tries to create a public S3 bucket and how resources are monitored when an EC2 instance is launched without a key pair.

Note

Both sets of guardrails come pre-configured with AWS Control Tower, but you always have the flexibility to add additional custom guardrails as needed.

Account Factory

A pivotal feature of AWS Control Tower is the Account Factory. This automation tool streamlines the provisioning of new AWS accounts by applying your organization’s baseline configurations such as AWS Config, CloudTrail, and relevant policies right from the start. This ensures consistent security and compliance while expanding your cloud infrastructure to meet growing demands.

The image is a diagram titled "Account Factory," showing a process flow with inputs of organizational unit and account details leading to "New Account Creation" and "Configuration & Baseline," resulting in the output of a new AWS account with guardrails and configurations.

Benefits of AWS Control Tower

Implementing AWS Control Tower provides several significant benefits:

Benefit	Description
Simplified Multi-Account Management	Centralizes the setup and governance of multiple AWS accounts.
Reduced Risk of Human Error	Automation minimizes manual configurations that could lead to misconfigurations and security breaches.
Automated Policy Enforcement	Pre-configured and custom guardrails ensure consistent compliance across all accounts.
Improved Operational Efficiency	Built-in monitoring and continuous auditing facilitate prompt detection and resolution of issues.
Scalable Account Provisioning	The Account Factory enables efficient setup of new accounts with baseline security settings.

Note

Leveraging AWS Control Tower reduces the complexity involved in managing a large-scale, multi-account environment while ensuring adherence to regulatory standards and internal policies.

The image lists five features: Simplified Multi-Account Environments, Reduce Risk of Human Error, Automated Policy Enforcement, Improve Operational Efficiency, and Continuous Monitoring. Each feature is represented with an icon and a gradient color background.

Summary

AWS Control Tower simplifies the creation and management of secure, compliant multi-account environments on AWS. By integrating best practices in organization setup, single sign-on, proactive guardrails, and automated account provisioning, it ensures that your cloud environment is consistently governed, monitored, and secured.

Thank you for following this lesson. For more insights on AWS security best practices, stay tuned for our upcoming articles.

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