Using aws networkfirewall with ecrpublic

Question

Pulumi · Accepted Answer

AWS Network Firewall is a managed service that makes it easier to deploy essential network protections for all of your Amazon Virtual Private Clouds (VPCs). The ECR Public is a fully managed container registry that makes it easy for developers to store, manage, share, and deploy container images and artifacts anywhere.

When integrating AWS Network Firewall with ECR Public, it would typically mean that you want to create firewall rules to control the traffic between your resources within a VPC and the ECR Public registry. This setup ensures that only allowed traffic can go out to the ECR Public or come into your VPC from the ECR Public.

Below, I'll guide you through a Pulumi program written in TypeScript that can set up such an infrastructure. The program creates a Network Firewall and a Firewall Policy to attach to the firewall. In this example, we will not dive into specific firewall rules, but rather, we will set up the basic building blocks to which you could add rules as needed.

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

// Create a new AWS Network Firewall Policy
const myFirewallPolicy = new aws.networkfirewall.FirewallPolicy("myFirewallPolicy", {
    firewallPolicy: {
        statelessDefaultActions: ["aws:pass"],
        statelessFragmentDefaultActions: ["aws:pass"],
        // Here you would define your stateful and stateless rule groups and other policy details
    },
    description: "My firewall policy",
});

// Create a new AWS Network Firewall
const myFirewall = new aws.networkfirewall.Firewall("myFirewall", {
    firewallPolicyArn: myFirewallPolicy.arn,
    vpcId: "vpc-12345678", // Replace with your VPC ID
    subnetMappings: [
        // Subnets where you want the firewall endpoints to be placed
        { subnetId: "subnet-12345678" }, // Replace with your Subnet ID
        { subnetId: "subnet-87654321" }, // Replace with your additional Subnet ID if necessary
    ],
    description: "My network firewall",
});

// To access the Network Firewall or Firewall Policy in Pulumi, you would use the respective ARNs:
// myFirewall.arn or myFirewallPolicy.arn

export const firewallArn = myFirewall.arn;
export const firewallPolicyArn = myFirewallPolicy.arn;
```

Here's what is happening in this program:

1. **Firewall Policy**: A Firewall Policy (`aws.networkfirewall.FirewallPolicy`) is being created using the `aws` provider, which will dictate what traffic is or isn't allowed through the firewall. 
    - The policy is currently set to allow all stateless traffic to "pass" through, which is represented by the `statelessDefaultActions` and `statelessFragmentDefaultActions` set to `["aws:pass"]`. In a real-world scenario, you would want to define more granular rules tailored to your security requirements.

2. **Firewall**: The Network Firewall resource (`aws.networkfirewall.Firewall`) is then created, associated with the VPC and subnets where you want the firewall to analyze traffic.
    - The `firewallPolicyArn` is associated with the firewall, linking the policy you just created to it.
    - The `vpcId` and `subnetMappings` need to be replaced with the actual VPC and Subnets where you're deploying the resources.

This will create a firewall with a default policy. To protect ECR Public traffic specifically, you would create and add rules groups to the firewall policy.

Remember, to deploy this Pulumi program, you need to have your AWS credentials configured and to have installed the Pulumi CLI and necessary programming language SDK. Once the Pulumi CLI is installed and configured, you can run `pulumi up` to create the resources in your AWS account.

Keep in mind that this program is a starting point, and depending on your application's needs, you might want to add more configurations and rules to your Network Firewall Policy. Always ensure that your firewall rules are configured according to the principle of least privilege, granting only the necessary permissions for your workloads.