Applying WAF Rules to HTTP(S) Load Balancers With GCP Security Policies

Introduction

In this solution, we will apply Web Application Firewall (WAF) rules to HTTP(S) Load Balancers using Google Cloud Platform (GCP) Security Policies with Pulumi. This setup helps protect your web applications from common web exploits and vulnerabilities by filtering and monitoring HTTP traffic between your web application and the internet. The key services involved in this solution are Google Cloud HTTP(S) Load Balancer, Google Cloud Armor (for WAF), and Pulumi for infrastructure as code (IaC) management.

Step-by-Step Explanation

Step 1: Set Up Pulumi Project

First, we need to set up a new Pulumi project. This involves initializing a new Pulumi project and configuring it to use TypeScript.

Step 2: Create a GCP Project and Service Account

Ensure you have a GCP project and a service account with the necessary permissions to manage resources. You will need to download the service account key file and configure Pulumi to use it.

Step 3: Define the HTTP(S) Load Balancer

We will define an HTTP(S) Load Balancer in our Pulumi program. This includes setting up the necessary backend services, URL maps, target proxies, and forwarding rules.

Step 4: Create Google Cloud Armor Security Policy

Next, we will create a Google Cloud Armor security policy. This policy will contain the WAF rules that we want to apply to our HTTP(S) Load Balancer.

Step 5: Attach Security Policy to Load Balancer

Finally, we will attach the Google Cloud Armor security policy to the backend services of our HTTP(S) Load Balancer.

Key Points

• Pulumi: An infrastructure as code tool that allows you to define and manage cloud resources using programming languages.
• Google Cloud HTTP(S) Load Balancer: A fully distributed, software-defined managed service for all your traffic distribution needs.
• Google Cloud Armor: Provides DDoS protection and WAF capabilities to help protect your applications.
• Security Policies: Used to define and enforce security rules for your applications.

Conclusion

By following this solution, you have successfully applied WAF rules to your HTTP(S) Load Balancer using GCP Security Policies with Pulumi. This setup enhances the security of your web applications by protecting them from various web threats and vulnerabilities. Pulumi’s infrastructure as code approach makes it easy to manage and automate the deployment of these resources.

Full Code Example

import * as pulumi from "@pulumi/pulumi";
import * as gcp from "@pulumi/gcp";

// Create a backend service
const backendService = new gcp.compute.BackendService("backend-service", {
    protocol: "HTTP",
    backends: [{
        group: "<INSTANCE_GROUP_URL>",
    }],
});

// Create a URL map
const urlMap = new gcp.compute.URLMap("url-map", {
    defaultService: backendService.selfLink,
});

// Create a target HTTP proxy
const targetHttpProxy = new gcp.compute.TargetHttpProxy("target-http-proxy", {
    urlMap: urlMap.selfLink,
});

// Create a forwarding rule
const forwardingRule = new gcp.compute.ForwardingRule("forwarding-rule", {
    target: targetHttpProxy.selfLink,
    portRange: "80",
    loadBalancingScheme: "EXTERNAL",
    ipProtocol: "TCP",
});

// Create a security policy
const securityPolicy = new gcp.compute.SecurityPolicy("security-policy", {
    rules: [{
        action: "allow",
        priority: 1000,
        match: {
            versionedExpr: "SRC_IPS_V1",
            config: {
                srcIpRanges: ["0.0.0.0/0"],
            },
        },
    }],
});

// Attach the security policy to the backend service
const backendServiceWithPolicy = new gcp.compute.BackendService("backend-service-with-policy", {
    protocol: "HTTP",
    backends: [{
        group: "<INSTANCE_GROUP_URL>",
    }],
    securityPolicy: securityPolicy.selfLink,
});

export const backendServiceUrl = backendService.selfLink;
export const urlMapUrl = urlMap.selfLink;
export const targetHttpProxyUrl = targetHttpProxy.selfLink;
export const forwardingRuleUrl = forwardingRule.selfLink;
export const securityPolicyUrl = securityPolicy.selfLink;