AWS Zero Trust Architecture

Project Overview

Designed and implemented a comprehensive Zero Trust security model for AWS environments, replacing traditional perimeter-based security with identity-centric controls.

Key Components

• IAM Policies with least privilege access
• Service Control Policies (SCPs) for account-level guardrails
• Network segmentation with VPCs and Security Groups
• Multi-factor authentication enforcement
• Continuous monitoring with AWS Config and CloudTrail

Implementation Details

The architecture was implemented using Terraform for infrastructure as code, with Python scripts for custom policy analysis and validation. Key features included:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Sid": "DenyAllExceptListedIfNoMFA",
      "Effect": "Deny",
      "NotAction": [
        "iam:CreateVirtualMFADevice",
        "iam:EnableMFADevice",
        "iam:ListMFADevices",
        "iam:ListUsers",
        "iam:ResyncMFADevice"
      ],
      "Resource": "*",
      "Condition": {
        "BoolIfExists": {
          "aws:MultiFactorAuthPresent": "false"
        }
      }
    }
  ]
}

Results

• Reduced attack surface by 60% through strict access controls
• Improved compliance with NIST 800-207 Zero Trust standards
• Automated policy enforcement across 15 AWS accounts
• Reduced incident response time by 40% through better logging