AWS WAF Implementation with ALB and EC2

Overview

This repository contains Terraform configurations to implement AWS WAF (Web Application Firewall) for securing applications running on EC2 instances behind an Application Load Balancer (ALB).

Architecture

Internet → WAF → ALB → EC2 Instances

Features

• AWS WAF implementation with custom rule sets
• ALB integration with WAF
• EC2 instance configuration
• Security group configurations
• Automated deployment using Terraform

Prerequisites

• Terraform >= 5.82.0
• AWS CLI configured with appropriate credentials
• IAM permissions for:
  • WAF
  • EC2
  • ALB
  • Security Groups
  • VPC

Components

1. WAF Configuration

   • Custom rule groups
   • Rate limiting rules
   • IP blacklisting/whitelisting
   • SQL injection protection
   • XSS protection

2. ALB Setup

   • HTTPS listener
   • Target group configuration
   • Health checks

3. EC2 Configuration

   • Auto Scaling Group
   • Security groups
   • Instance profile

Quick Start

1. Clone the Repository

   git clone https://github.com/Leapfrog-DevOps/tf-demo.git

2. Configure Variables

   • Update terraform.tfvars with your specific values
   • Modify region and environment settings as needed

3. Initialize Terraform

   terraform init

4. Validate Configuration

   terraform validate

5. Review the Plan

   terraform plan

6. Apply Configuration

   terraform apply

WAF Rules Included

1. Rate-based rules for DDoS protection
2. AWS Managed Rules
   • Common Rule Set (CRS)
   • SQL injection prevention
   • Cross-site scripting (XSS) prevention
   • Bad bots protection
   • Bad input rule set
   • Admin Protection Rule Set
3. Geographic-based rules

Maintenance

1. Regular updates of WAF rules
2. Monitoring and logging configuration
3. Performance optimization
4. Security patch management

Best Practices

1. Always use HTTPS
2. Implement proper logging
3. Regular security audits
4. Keep WAF rules updated
5. Monitor WAF metrics

Contributing

1. Fork the repository
2. Create a feature branch
3. Commit changes
4. Push to the branch
5. Create a Pull Request

ⓘ Info: This repo includes a simple implementation of AWS WAF with ALB and EC2. It is intended for understanding the creation of WAF and attach it with certain service and may not be suitable for production use. There are a lot need to be changed and improved according to the needs and requirements.

Support

For support, please contact the DevOps team or raise an issue in the repository.