AWS Elastic Load Balancer User Authentication With Pulumi Using TypeScript

Introduction

In this solution, we will set up an AWS Elastic Load Balancer (ELB) with user authentication using Pulumi and TypeScript. The key services involved in this solution are AWS Elastic Load Balancer, AWS IAM (Identity and Access Management), and AWS Cognito. The ELB will distribute incoming traffic across multiple targets, and we will use AWS Cognito to handle user authentication.

Step-by-Step Explanation

Step 1: Set up AWS Cognito User Pool

We will create an AWS Cognito User Pool to manage user authentication. This user pool will store user profiles and handle sign-up and sign-in functionality.

Step 2: Create an AWS IAM Role

We will create an IAM role that grants the necessary permissions for the ELB to authenticate users using the Cognito User Pool.

Step 3: Set up the AWS Elastic Load Balancer

We will create an AWS Elastic Load Balancer and configure it to use the Cognito User Pool for user authentication. This involves setting up a listener rule that forwards traffic to the target group only if the user is authenticated.

Step 4: Create Target Group and Register Targets

We will create a target group and register our application instances (EC2 instances) with the target group. The ELB will forward authenticated traffic to these targets.

Step 5: Configure Security Groups

We will configure security groups to allow traffic between the ELB and the target instances.

Key Points

• AWS Cognito User Pool is used to manage user authentication.
• IAM role is required to grant permissions for ELB to use Cognito for authentication.
• ELB is configured with a listener rule to forward traffic only if the user is authenticated.
• Target group is created to register application instances.
• Security groups are configured to allow traffic between ELB and target instances.

Conclusion

By following these steps, we have successfully set up an AWS Elastic Load Balancer with user authentication using Pulumi and TypeScript. This solution ensures that only authenticated users can access the application, providing an additional layer of security.

Full Code Example

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

// Create a Cognito User Pool
const userPool = new aws.cognito.UserPool("userPool", {
    name: "example-user-pool",
});

// Create a Cognito User Pool Client
const userPoolClient = new aws.cognito.UserPoolClient("userPoolClient", {
    userPoolId: userPool.id,
});

// Create a Cognito User Pool Domain
const userPoolDomain = new aws.cognito.UserPoolDomain("userPoolDomain", {
    userPoolId: userPool.id,
    domain: "example-domain",
});

// Create an IAM Role
const iamRole = new aws.iam.Role("iamRole", {
    assumeRolePolicy: JSON.stringify({
        Version: "2012-10-17",
        Statement: [
            {
                Action: "sts:AssumeRole",
                Effect: "Allow",
                Principal: {
                    Service: "elasticloadbalancing.amazonaws.com",
                },
            },
        ],
    }),
});

// Create a Security Group
const securityGroup = new aws.ec2.SecurityGroup("securityGroup", {
    description: "Allow all HTTP(s) traffic",
    ingress: [
        { protocol: "tcp", fromPort: 80, toPort: 80, cidrBlocks: ["0.0.0.0/0"] },
        { protocol: "tcp", fromPort: 443, toPort: 443, cidrBlocks: ["0.0.0.0/0"] },
    ],
    egress: [
        { protocol: "-1", fromPort: 0, toPort: 0, cidrBlocks: ["0.0.0.0/0"] },
    ],
});

// Create a Target Group
const targetGroup = new aws.lb.TargetGroup("targetGroup", {
    port: 80,
    protocol: "HTTP",
    vpcId: securityGroup.vpcId,
    targetType: "instance",
    healthCheck: {
        path: "/",
        protocol: "HTTP",
    },
});

// Create an Elastic Load Balancer
const loadBalancer = new aws.lb.LoadBalancer("loadBalancer", {
    internal: false,
    securityGroups: [securityGroup.id],
    subnets: pulumi.output(aws.ec2.getSubnets({})).apply(subnets => subnets.ids),
});

// Create a Listener
const listener = new aws.lb.Listener("listener", {
    loadBalancerArn: loadBalancer.arn,
    port: 443,
    protocol: "HTTPS",
    defaultActions: [{
        type: "authenticate-cognito",
        authenticateCognito: {
            userPoolArn: userPool.arn,
            userPoolClientId: userPoolClient.id,
            userPoolDomain: userPoolDomain.domain,
        },
        order: 1,
    }, {
        type: "forward",
        targetGroupArn: targetGroup.arn,
    }],
});

// Create a Listener Rule
const listenerRule = new aws.lb.ListenerRule("listenerRule", {
    listenerArn: listener.arn,
    actions: [{
        type: "forward",
        targetGroupArn: targetGroup.arn,
    }],
    conditions: [{
        pathPattern: {
            values: ["/*"],
        },
    }],
    priority: 1,
});

export const loadBalancerDnsName = loadBalancer.dnsName;