154 lines
5.1 KiB
Markdown
154 lines
5.1 KiB
Markdown
# Firewall
|
||
|
||
**Zoraxy plugin** — Inline WAF inspection proxy with health checks, circuit breaker, and fail-open bypass. Works with Wallarm, ModSecurity, Coraza, or any inspection service that returns HTTP status codes.
|
||
|
||
---
|
||
|
||
## Quick Install
|
||
|
||
The plugin is built into Zoraxy — just enable it from the Plugins panel. If you need to build from source:
|
||
|
||
```bash
|
||
git clone https://git.lohmar.co.uk/cclohmar/zoraxy-waf.git /opt/zoraxy/plugins/zoraxy-waf
|
||
cd /opt/zoraxy/plugins/zoraxy-waf
|
||
go build -buildvcs=false -o zoraxy-waf .
|
||
chown -R zoraxy:zoraxy /opt/zoraxy/plugins/zoraxy-waf
|
||
systemctl restart zoraxy
|
||
```
|
||
|
||
Then enable **Firewall** in Zoraxy → Plugins.
|
||
|
||
---
|
||
|
||
## Configuration
|
||
|
||
Open the Firewall panel at `/plugin.ui/zoraxy-firewall/`:
|
||
|
||
| Setting | Default | Description |
|
||
|---------|---------|-------------|
|
||
| **Enable** | Off | Toggle WAF inspection on/off |
|
||
| **WAF Inspection URL** | `http://127.0.0.1:8080` | Inspection endpoint — receives `POST /inspect` |
|
||
| **Return Port** | `8080` | Port for async WAF callbacks/alerts |
|
||
| **Health Interval** | `5s` | How often to ping the WAF |
|
||
| **Timeout** | `500ms` | Max wait time for a verdict |
|
||
|
||
---
|
||
|
||
## How It Works
|
||
|
||
```
|
||
Client → Zoraxy
|
||
│
|
||
▼
|
||
┌──────────────────┐
|
||
│ Firewall Plugin │──► POST http://waf:8080/inspect
|
||
│ (static capture) │ {method, url, headers, body_sample}
|
||
└────┬─────────────┘
|
||
│
|
||
┌────┴────────────────────────────┐
|
||
│ WAF returns 403 │ → 280 (BLOCK) → Request dropped
|
||
│ WAF returns 2xx │ → 284 (FORWARD) → Zoraxy routes to backend
|
||
│ WAF unreachable / breaker OPEN │ → 284 (FAIL-OPEN)→ Zoraxy routes to backend
|
||
└─────────────────────────────────┘
|
||
```
|
||
|
||
### Circuit Breaker
|
||
|
||
If the WAF fails 5 times within a 30-second window, the breaker opens. All traffic bypasses inspection (fail-open) for 10 seconds. After the cooldown, the next successful health check closes the breaker.
|
||
|
||
### Health Check
|
||
|
||
The plugin periodically sends a `HEAD` request to the WAF URL. If the WAF responds with < 500, the circuit breaker records success. If it fails or returns 5xx, it records a failure.
|
||
|
||
---
|
||
|
||
## Inspection Protocol
|
||
|
||
The plugin sends this JSON payload to `{WAF_URL}/inspect`:
|
||
|
||
```json
|
||
{
|
||
"method": "GET",
|
||
"url": "/some/path",
|
||
"host": "example.com",
|
||
"remote_addr": "10.1.0.5:12345",
|
||
"content_type": "application/json",
|
||
"content_length": 256,
|
||
"headers": {...},
|
||
"body_sample": "<first 4KB of request body>"
|
||
}
|
||
```
|
||
|
||
The WAF inspects and returns an HTTP status code:
|
||
- **200–299** → Request is clean, Zoraxy forwards to backend
|
||
- **403** → Request is malicious, plugin blocks it
|
||
- **5xx / timeout** → Plugin fails open, records breaker failure
|
||
|
||
Any WAF that accepts a POST and returns the appropriate status code is compatible. No special Wallarm integration required.
|
||
|
||
---
|
||
|
||
## Zoraxy Integration
|
||
|
||
To activate the plugin for specific proxy rules:
|
||
|
||
1. Zoraxy → Plugins → enable **Firewall**
|
||
2. Create a plugin group (e.g., "waf") → add the Firewall plugin
|
||
3. Edit proxy rules → add the "waf" tag
|
||
|
||
The plugin uses Zoraxy's **static capture** to intercept all requests matched by tagged proxy rules.
|
||
|
||
---
|
||
|
||
## API Endpoints
|
||
|
||
| Method | Path | Purpose |
|
||
|--------|------|---------|
|
||
| `GET` | `/ui/api/config` | Get current configuration |
|
||
| `POST` | `/ui/api/config/save` | Save configuration |
|
||
| `GET` | `/ui/api/stats` | Inspect/bock/bypass metrics + breaker state |
|
||
| `POST` | `/inspect` | Static capture — Zoraxy sends traffic here |
|
||
| `POST` | `/verdict` | Return port — WAF sends async callbacks here |
|
||
|
||
---
|
||
|
||
## Architecture
|
||
|
||
```
|
||
/opt/zoraxy/plugins/zoraxy-waf/
|
||
├── zoraxy-waf # Compiled plugin binary
|
||
├── waf_config.json # Runtime configuration (auto-created)
|
||
├── config.go # Config load/save (thread-safe)
|
||
├── main.go # Plugin entry, UI router, return listener
|
||
├── middleware.go # Inspection handler + metrics
|
||
├── proxy.go # WAF HTTP client (body sample + request forwarding)
|
||
├── circuit_breaker.go # Fail-open state machine
|
||
├── health.go # Background health check goroutine
|
||
├── web/ # Config panel UI
|
||
│ ├── index.html
|
||
│ ├── style.css
|
||
│ └── app.js
|
||
├── cmd/mockwallarm/ # Test mock WAF server
|
||
└── zoraxy_plugin/ # Vendored Zoraxy plugin SDK (LGPL)
|
||
```
|
||
|
||
---
|
||
|
||
## Environment Variables
|
||
|
||
| Variable | Default | Description |
|
||
|----------|---------|-------------|
|
||
| *none* | — | All config is managed through the UI and persisted to `waf_config.json` |
|
||
|
||
---
|
||
|
||
## License
|
||
|
||
Zoraxy plugin SDK is LGPL. This plugin is open source.
|
||
|
||
---
|
||
|
||
## Credits
|
||
|
||
- [Zoraxy](https://github.com/tobychui/zoraxy) — Reverse proxy and plugin system
|
||
- Compatible with any WAF that returns HTTP verdicts (Wallarm, ModSecurity, Coraza, custom)
|