If you're looking for a free, powerful Web Application Firewall (WAF), SafeLine WAF should be at the top of your list.
Developed by Chaitin Tech, SafeLine has been refined for years, with core technologies like semantic analysis engines and security modules open-sourced since 2016. SafeLine WAF is making waves in the security community — it's powerful, easy to deploy, and completely free to use.
🔒 What Is SafeLine WAF?
SafeLine is a reverse proxy-based WAF that blocks malicious HTTP traffic before it reaches your web service. Acting as a shield between your site and the internet, it helps you mitigate:
- Web attacks like SQL injection and XSS
- Automated tools and vulnerability scanners
- Malicious bots and scrapers
- DDoS attempts via rate limiting and verification
Whether you're running a blog, an API backend, or a full-stack app — SafeLine helps you stay secure with zero cost.
🛡️ Key Features
- ✅ Web Attack Protection — blocks SQLi, XSS, SSRF, etc.
- ✅ Anti-bot & Anti-crawler — detects and mitigates automated scanning.
- ✅ Dynamic JS/HTML Protection — makes reverse engineering much harder.
- ✅ IP Rate Limiting — thwarts brute-force attacks and DoS attempts.
- ✅ Advanced HTTP Access Control — fine-grained request filtering.
⚙️ Requirements & Quick Install
System Requirements
- OS: Linux (x86_64)
- Docker ≥ 20.10.6
- Docker Compose ≥ 2.0.0
- Minimum: 1 Core CPU, 1GB RAM, 10GB Disk
One-Click Install Command
bash -c "$(curl -fsSLk https://waf.chaitin.com/release/latest/manager.sh)" -- --en
After installation, you'll get the dashboard URL and default login credentials.
🚀 Getting Started with SafeLine
1. Log Into the Dashboard
Open the provided URL, use the default credentials, and click "Advanced" if the browser warns about the certificate.
2. Enable Rate Limiting & Human Verification
This protects against:
- Brute-force login attempts
- Fuzzing and payload injections
- Credential stuffing
- Unauthorized API spamming
3. Add Your Application
In the upstream config, fill in your app's internal URL. If you're using nginx, don’t forget to whitelist SafeLine's IP.
🧠 Smart Anti-Bot & HTTP Flood
SafeLine supports:
- HTTP Flood — detects HTTP floods.
- Bot Protection — dynamically encrypts frontend JS/HTML to prevent scrapers and reverse engineering.
Dynamic Protection In Action
- Each page load delivers randomized frontend code
- Significantly increases difficulty for attackers
- Combines with AI-powered behavior analysis, threat intelligence, and IP reputation scoring
HTML Before and After Enabling
JS Before and After Enabling
🧪 Protection Test: Real Attacks
🔍 XSS Attempt
<script>alert(1)</script>
Result: Blocked and logged by SafeLine.
🧨 SQL Injection
https://yourdomain.com/?id=1+and+1=2+union+select+1
Result: Detected and intercepted.
📊 Real-World Effectiveness
| WAF | Accuracy | Detection | Miss Rate | False Positive |
|---|---|---|---|---|
| SafeLine (Personal - Balanced) | 99.45% | 71.65% | 28.35% | 0.07% |
| SafeLine (Personal - High) | 99.38% | 76.17% | 23.83% | 0.22% |
| SafeLine (Pro - High) | 99.66% | 90.68% | 9.32% | 0.07% |
| Cloudflare WAF | 98.40% | 10.70% | 89.30% | 0.07% |
| ModSecurity (Level 1) | 82.39% | 82.26% | 17.74% | 17.61% |
| ModSecurity (Level 4) | 48.32% | 96.77% | 3.23% | 52.49% |
These stats speak for themselves. SafeLine consistently outperforms traditional WAFs in detection rate while keeping false positives low.
🤝 Join the SafeLine Community
Want to learn more, get help, or share tips? Join the official SafeLine WAF community:
- Ask deployment questions
- Share security tricks
- Get early updates
Meet fellow security enthusiasts
🌐 Final Thoughts
SafeLine WAF is one of the most robust, free WAFs out there. It’s lightweight, powerful, and easy to deploy — whether you're running on a cloud server or a home lab.
If you're serious about web security, give SafeLine WAF a try. It just might become your favorite security layer.
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