SSL/TLS Security Pack

Why Default Configs Are Leaving Your Traffic Exposed

We've all seen it: a developer copies a snippet from a forum, pastes it into nginx.conf, and calls it secure. The site loads over HTTPS, the green padlock appears, and the ticket closes. But "HTTPS" is not a security guarantee. It's a protocol with a configuration space so vast that a single wrong directive can downgrade your traffic to TLS 1.0, expose you to POODLE, or leak sensitive headers to third parties.

Most production deployments drift from secure baselines. You might have OCSP stapling disabled, meaning every client has to hit the Certificate Authority directly, killing your TTFB and increasing load on the CA. You might be serving weak ciphers like RC4 or DES because the default config didn't explicitly ban them. Tools like Gixy exist to catch these misconfigurations in Nginx, but they require integration into your workflow to be effective ^[4]. Without a canonical reference, you're guessing. You're relying on the Mozilla SSL Configuration Generator ^[5] but manually translating that output into your specific stack, which is where the errors inevitably happen.

If you're managing certificates across multiple domains or subdomains, you're likely using ad-hoc scripts that break when the chain changes or the renewal hook fails. You might be using the Setting Up Ssl Certificates skill to get the basics, but that doesn't cover the hardening required for production. You need a system that enforces security headers ^[6] and validates your TLS profile automatically before the code hits production.

The Cost of a Misconfigured Cipher Suite

Let's talk about the real cost. It's not just a failing Lighthouse score or a red flag on a security scan. When your TLS configuration is weak, you fail audits. The Open Tech Fund's security audit report highlights that missing HSTS and weak SSL configurations are common failure points that require immediate remediation ^[6]. If you're in a regulated industry or handling PII, this isn't a "fix later" ticket. It's a blocker.

NIST Special Publication 1800-16C provides specific guidance on establishing consistent governance for TLS certificates ^[3]. Without that governance, you end up in the nightmare scenario: a certificate expires on a production server, and because you didn't have an automated renewal workflow with proper hooks, your service goes dark. We've seen teams lose hours debugging "connection refused" errors only to find the cert expired three days ago. The cost of fixing this post-incident is ten times the cost of getting it right the first time.

The downstream impact is severe. A weak cipher suite can lead to data interception. A missing Strict-Transport-Security header allows SSL stripping attacks. If you're deploying to Kubernetes, a misconfigured ingress controller can expose internal services to the internet unencrypted. You need a system that integrates with your DevSecOps Pipeline Pack to enforce these standards as code. You need to stop treating TLS as an afterthought and start treating it as a critical dependency.

How a Single Missing Header Triggered a Compliance Failure

Imagine a fintech startup scaling its backend from five to fifty microservices. They use Let's Encrypt for certificates and Nginx as a reverse proxy. Everything works fine until a third-party security audit runs. The auditor flags two critical issues: the API gateway is missing the Permissions-Policy header, and one of the legacy services is still accepting TLS 1.0 connections.

The team scrambles. They realize they don't have a centralized way to manage these headers across all services. They try to patch the Nginx configs manually, but the changes don't propagate correctly to the staging environment. Meanwhile, the legacy service is hard to update because it's a monolith. The audit fails. The client threatens to pull the contract.

This is a hypothetical illustration of what happens when TLS management is treated as an afterthought. In reality, this mirrors the challenges described in NIST's guidance on securing web transactions ^[2]. The team needed a standardized template for Nginx that included OWASP-compliant security headers ^[6]. They needed a script to test their TLS profile against Mozilla's modern and intermediate standards. They needed a systemd timer to automate certificate renewal so that human error couldn't cause an outage.

This scenario is common in environments using the API Security Pack where the focus is on authentication but the transport layer is overlooked. It's also a risk in Kubernetes Deployment Pack setups where the ingress controller configuration is managed separately from the application code. Without a unified approach, you're flying blind.

What Changes When You Ship a Hardened TLS Stack

Once you install the SSL/TLS Security Pack, the guesswork disappears. You get a decision tree in skill.md that walks you through choosing between the Mozilla Modern and Intermediate profiles based on your client requirements. You drop templates/nginx-ssl.conf into your project, and you have a production-grade config with OCSP stapling, HSTS preloading, and the correct cipher suites already applied.

You stop worrying about certificate expiry. The certbot-renewal.service template sets up a systemd timer that checks for renewal and reloads your web server automatically. You run scripts/cert-check.sh in your CI pipeline, and it exits non-zero if a cert is expiring within 30 days or if the private key doesn't match the certificate.

You get validation before merge. The validators/nginx-ssl-validator.sh script scans your config for missing HSTS or insecure ciphers. If a PR introduces a weak protocol, the build fails. The validators/header-validator.sh script hits your staging URL and ensures OWASP recommended headers are present. You're no longer relying on manual checks or hoping the engineer remembered to add X-Frame-Options. You have automated, scriptable security.

This skill integrates seamlessly with your existing workflow. If you're using Configuring Cloudflare Cdn, these templates ensure your origin is hardened before traffic even hits Cloudflare. For teams building PWAs, this complements the PWA Builder Pack by ensuring your service workers are delivered over a secure, validated connection.

What's in the SSL/TLS Security Pack

We built this so you don't have to reinvent the wheel every time you spin up a new service. Here is exactly what you get:

• skill.md — Orchestrator skill that defines the SSL/TLS security expertise, references all templates, scripts, validators, and references. Provides decision tree for choosing between modern/intermediate TLS profiles, certbot workflows, and header configurations.
• templates/nginx-ssl.conf — Production-grade Nginx SSL configuration with Mozilla intermediate profile, OCSP stapling, HSTS preloading, HTTP-to-HTTPS redirect, and proper certificate paths from Let's Encrypt.
• templates/apache-ssl.conf — Production-grade Apache SSL configuration with Mozilla intermediate profile, HSTS, secure cipher suites, and proper Let's Encrypt certificate file references.
• templates/security-headers.conf — OWASP Secure Headers Project compliant HTTP response headers configuration for both Nginx and Apache, including HSTS, CSP, X-Frame-Options, Referrer-Policy, and Permissions-Policy.
• templates/certbot-renewal.service — systemd timer and service unit for automated Let's Encrypt certificate renewal with post-reload hooks, based on certbot best practices.
• scripts/cert-check.sh — Executable script that validates certificate expiry dates, checks certificate chain validity, verifies private key matches, and reports warnings for certificates expiring within 30 days. Exits non-zero on critical failures.
• scripts/tls-profile-test.sh — Executable script that tests a target host against Mozilla modern and intermediate TLS profiles using openssl s_client, checking protocol versions and cipher suites. Exits non-zero if expected protocols are enabled.
• validators/nginx-ssl-validator.sh — Validates a Nginx SSL configuration file against security best practices: checks for missing HSTS, insecure ciphers, weak protocols, and missing OCSP stapling. Exits non-zero on any validation failure.
• validators/header-validator.sh — Scans HTTP response headers from a target URL and validates presence and correctness of OWASP recommended security headers. Exits non-zero if critical headers are missing or misconfigured.
• references/mozilla-tls-config.md — Canonical Mozilla TLS configuration guide with exact cipher suite strings, protocol versions, and key exchange parameters for both Modern and Intermediate profiles. Includes the full cipher suite definitions and recommended DH parameters.
• references/owasp-secure-headers.md — Complete OWASP Secure Headers Project reference with all recommended headers, their purposes, syntax, and compatibility notes. Includes HSTS preload list requirements and CSP directive explanations.
• references/letsencrypt-guide.md — Operational guide for Let's Encrypt/Certbot covering certificate file locations, renewal workflows, manual plugin with hooks, dry-run testing, and common troubleshooting. Based on official certbot documentation.
• references/openssl-operations.md — Reference for OpenSSL cryptographic operations including certificate inspection, key generation, CSR creation, SNI testing, and chain verification. Covers x509, rsa, s_client, and s_server commands.
• examples/production-deployment.yaml — Worked example showing a complete production deployment configuration including Nginx SSL config, security headers, certbot renewal setup, and deployment checklist for a multi-domain site.

Stop Guessing. Start Shipping Secure Defaults.

You can spend the next week reading RFC 8446 ^[5] and manually testing cipher suites, or you can install the pack and get to work. Upgrade to Pro to install the SSL/TLS Security Pack and lock down your infrastructure today.