Patterns

Production-grade WAF rules, on autopilot.

Automated OWASP Core Rule Set and bad-bot patterns, converted into native configurations for Nginx, Apache, Traefik, and HAProxy — refreshed every day.

Documentation · Get started · Latest release

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Why Patterns

The OWASP Core Rule Set (CRS) is the de-facto open-source rule base behind ModSecurity, but plugging it into anything other than Apache is non-trivial. Patterns automates the whole pipeline:

1. Pull the latest CRS rules straight from upstream.
2. Convert them into the native syntax of each web server — not a generic shim.
3. Package the output as ready-to-deploy archives, refreshed every day by GitHub Actions.

You get equivalent protection across SQL injection, XSS, RCE, LFI, and bad-bot traffic, regardless of which proxy you run.

Highlights

OWASP CRS coverage	SQLi, XSS, RCE, LFI, RFI, plus generic anomaly and protocol-violation rules.
Native output	Nginx map/if, Apache SecRule, Traefik middleware TOML, HAProxy ACL files.
Bad-bot blocking	Curated User-Agent lists from public sources, with safe defaults that do not block major search engines.
Daily refresh	A scheduled GitHub Actions workflow rebuilds every backend and publishes a fresh release.
Pre-built archives	Skip the toolchain — download nginx_waf.zip, apache_waf.zip, traefik_waf.zip, or haproxy_waf.zip.
Composable	Each backend is a small Python converter on top of one JSON intermediate. Adding a new platform is a few hundred lines.

Using Caddy? See the dedicated caddy-waf project.

Quick start

Option 1 — download a pre-built release

# Pick the archive that matches your stack
curl -LO https://github.com/fabriziosalmi/patterns/releases/latest/download/nginx_waf.zip
unzip nginx_waf.zip -d /etc/nginx/waf_patterns

Then follow the Nginx, Apache, Traefik, or HAProxy integration guide.

Option 2 — build from source

Requires Python 3.11+, pip, and git.

git clone https://github.com/fabriziosalmi/patterns.git
cd patterns
pip install -r requirements.txt

python owasp2json.py            # 1. Fetch the latest OWASP CRS into owasp_rules.json
python json2nginx.py            # 2. Convert into Nginx WAF config
python json2apache.py           #    …or Apache (ModSecurity)
python json2traefik.py          #    …or Traefik middleware
python json2haproxy.py          #    …or HAProxy ACL files
python badbots.py               # 3. Generate bad-bot blocklists

Generated files land in waf_patterns/<platform>/.

Architecture

   ┌─────────────────────┐    daily cron     ┌──────────────────────┐
   │ coreruleset/        │ ───────────────▶  │ owasp2json.py        │
   │ coreruleset (GH)    │                   │   → owasp_rules.json │
   └─────────────────────┘                   └──────────┬───────────┘
                                                        │
            ┌─────────────────┬──────────────────┬──────┴──────────┐
            ▼                 ▼                  ▼                 ▼
      json2nginx.py    json2apache.py    json2traefik.py    json2haproxy.py
            │                 │                  │                 │
            ▼                 ▼                  ▼                 ▼
       nginx_waf.zip    apache_waf.zip    traefik_waf.zip    haproxy_waf.zip
                          (published as a GitHub Release)

Each converter is independent, idempotent, and configured exclusively through environment variables (INPUT_FILE, OUTPUT_DIR). Full reference at docs/api.

Repository layout

patterns/
├── owasp2json.py            # Pull and parse OWASP CRS into a JSON intermediate
├── json2nginx.py            # JSON → Nginx (map + if directives)
├── json2apache.py           # JSON → Apache (ModSecurity SecRule)
├── json2traefik.py          # JSON → Traefik (middleware TOML)
├── json2haproxy.py          # JSON → HAProxy (ACL files)
├── badbots.py               # Public bot lists → per-platform blocklists
├── import_*_waf.py          # Optional installers for each platform
├── waf_patterns/            # Generated outputs
│   ├── nginx/
│   ├── apache/
│   ├── traefik/
│   └── haproxy/
├── docs/                    # VitePress documentation site
├── tests/                   # Validation tests for each backend
└── .github/workflows/       # Daily build + release automation

Integration in 60 seconds

Nginx

http {
    include /etc/nginx/waf_patterns/nginx/waf_maps.conf;
    include /etc/nginx/waf_patterns/nginx/bots.conf;
}
server {
    include /etc/nginx/waf_patterns/nginx/waf_rules.conf;
    if ($bad_bot) { return 403; }
}

Apache (ModSecurity)

<IfModule security2_module>
    SecRuleEngine On
    Include /etc/apache2/waf_patterns/apache/*.conf
</IfModule>

Traefik

http:
  routers:
    app:
      rule: "Host(`example.com`)"
      service: app
      middlewares: [waf-protection@file, bot-blocker@file]

HAProxy

frontend http-in
    bind *:80
    acl waf_match path,url_dec -m reg -i -f /etc/haproxy/waf.acl
    acl bad_bot   hdr(User-Agent) -m reg -i -f /etc/haproxy/bots.acl
    http-request deny deny_status 403 if waf_match || bad_bot

Full guides — with logging, whitelists, and tuning — live in the docs.

Bad-bot example output (Nginx)

map $http_user_agent $bad_bot {
    default 0;
    "~*AhrefsBot"  1;
    "~*SemrushBot" 1;
    "~*MJ12bot"    1;
    "~*GPTBot"     1;
}

if ($bad_bot) { return 403; }

The default list blocks SEO crawlers, AI training bots, and known scanners while explicitly allowing major search engines (Google, Bing, DuckDuckGo, Yandex, Baidu).

Automation

Workflow	Schedule	Purpose
update_patterns.yml	Daily + manual	Re-fetch CRS, regenerate every backend, publish a release
test_nginx.yml	On PR	Validate generated Nginx rules against a live container
test_apache_docker.yml	On PR	Validate generated Apache rules against ModSecurity in Docker
docs.yml	On docs/ change	Build and deploy the VitePress docs to GitHub Pages

All workflows run on GitHub-hosted runners (ubuntu-latest).

Documentation

The full documentation lives at fabriziosalmi.github.io/patterns — built with VitePress and deployed automatically.

• Getting Started
• Nginx · Apache · Traefik · HAProxy
• Bad Bot Detection
• API & Scripts Reference

Contributing

1. Fork the repository.
2. Create a feature branch: git checkout -b feature/your-change.
3. Commit and push.
4. Open a pull request — the test workflows will run automatically.

See CONTRIBUTING.md for details and SECURITY.md for the disclosure policy.

License

Released under the MIT License.

Resources

• OWASP Core Rule Set
• ModSecurity
• Nginx · Apache HTTPD · Traefik · HAProxy
• ai.robots.txt — upstream AI-bot list

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_{Built and maintained by Fabrizio Salmi.}