Unlock Certificate Transparency with Azul: A Guide to Cloudflare Worker Deployment

Tired of opaque certificate processes? Dive into Azul, Cloudflare's open-source solution for certificate transparency (CT) using a tiled log. This guide breaks down Azul and how you can deploy it on Cloudflare Workers to gain unparalleled insight into your certificates.

What is Azul and Why Should You Care?

Azul, inspired by vibrant Portuguese and Spanish tiles (azulejos), is a tiled certificate transparency log built for Cloudflare Workers. It's designed around the Static CT API, giving you a powerful tool for monitoring and verifying SSL/TLS certificates.

Key Benefits of Using Azul:

• Enhanced Security: Proactively identify mis-issued or fraudulent certificates.
• Improved Transparency: Gain complete visibility into the certificate issuance process.
• Static CT API Compatibility: Seamlessly integrate with existing CT infrastructure.
• Cloudflare Worker Optimized: Deploy on a scalable and reliable platform.

Understanding the Components of Azul

Azul comprises several Rust crates, each addressing a specific aspect of certificate transparency. Understanding these components is key to leveraging the full power of Azul.

• ct_worker: This crate contains the core Static CT API log implementation tailored for Cloudflare Workers. It’s the engine that drives Azul's functionality.
• static_ct_api: An implementation of the C2SP static-ct-api specification.
• signed_note: Implements the C2SP signed-note specification, ensuring secure communication.
• tlog_tiles: Handles the C2SP tlog-tiles and C2SP checkpoint specifications, creating a structured and verifiable log.

Deploying Azul on Cloudflare Workers: A Step-by-Step Guide

Ready to deploy certificate transparency using Azul? The ct_worker crate provides detailed deployment instructions. Let's outline the general process:

1. Set up your Cloudflare Workers environment: Make sure you have a Cloudflare account and the Workers CLI installed.
2. Configure the ct_worker crate: Follow the crate's specific deployment instructions.
3. Deploy to Cloudflare Workers: Use the Workers CLI to deploy your configured ct_worker service.

Building, Testing, and Benchmarking Azul

Azul offers tools for testing and optimizing performance, ensuring your certificate transparency setup is rock solid.

• Build: cargo build
• Test: cargo test
• Benchmark: cargo bench - Evaluate the performance of Azul's components.

Fuzzing for Enhanced Security

To ensure robustness, Azul includes fuzzing capabilities. Follow the setup instructions from the rust-fuzz book. These tests require a nightly compiler.

• cargo fuzz run fuzz_parse_tile_path
• cargo fuzz run fuzz_parse_tree
• cargo fuzz run fuzz_parse_record

Take Control of Certificate Transparency Today!

Azul empowers you to take control of your certificate security by providing a transparent and verifiable log. Deploy Azul on Cloudflare Workers and experience the benefits of a truly open and secure certificate ecosystem.