nginx-defender

README

nginx-defender

Enterprise-Grade Web Application Firewall with Advanced Threat Intelligence

---

Table of Contents

Click to expand

• Overview
• Architecture
• Core Features
  • Threat Detection Engine
  • Firewall Management
  • Monitoring & Analytics
  • Notification System
• Technical Specifications
• Installation
  • Binary Installation
  • Docker Deployment
  • Kubernetes Deployment
• Configuration
• API Reference
• Performance Benchmarks
• Security Considerations
• Development
• License

---

Overview

nginx-defender is a high-performance, enterprise-grade Web Application Firewall (WAF) and threat detection system engineered for modern web infrastructure. Built with Go and designed for scalability, it provides real-time threat mitigation, machine learning-based anomaly detection, and comprehensive security analytics.

Key Differentiators

graph TD
    A[Incoming Traffic] --> B[Log Parser]
    B --> C[Threat Detection Engine]
    C --> D[ML Anomaly Detection]
    C --> E[Pattern Matching]
    C --> F[Rate Limiting]
    D --> G[Firewall Manager]
    E --> G
    F --> G
    G --> H[iptables/nftables/pf]
    G --> I[Notification System]
    I --> J[Dashboard/API]

Feature	nginx-defender	Commercial WAFs	Open Source WAFs
Real-time ML Detection	Native	Limited	None
Multi-backend Firewall	5+ backends	Proprietary	Limited
Advanced Analytics	Built-in	Expensive addon	Basic
Geographic Intelligence	Integrated	Licensed	Manual
Clustering Support	Native	Enterprise only	None
Container Ready	OCI compliant	Legacy	Configuration heavy

---

Architecture

System Architecture

High-Level Architecture Diagram

┌────────────────────────────────────────────────────────────────┐
│                        nginx-defender                          │
├────────────────────────────────────────────────────────────────┤
│  ┌───────────────┐  ┌──────────────┐  ┌─────────────────────┐  │
│  │  Log Monitor  │  │ Threat Intel │  │   Web Dashboard     │  │
│  │   (Async)     │  │  (Real-time) │  │    (WebSocket)      │  │
│  └───────┬───────┘  └──────┬───────┘  └─────────┬───────────┘  │
│          │                 │                    │              │
│  ┌───────▼─────────────────▼────────────────────▼───────────┐  │
│  │                Threat Detection Engine                   │  │
│  │  ┌─────────────┐ ┌──────────────┐ ┌─────────────────┐    │  │
│  │  │   Pattern   │ │  ML Anomaly  │ │  Rate Limiting  │    │  │
│  │  │   Matcher   │ │  Detection   │ │     Engine      │    │  │
│  │  └─────────────┘ └──────────────┘ └─────────────────┘    │  │
│  └─────────────────────────┬────────────────────────────────┘  │
│                            │                                   │
│  ┌─────────────────────────▼────────────────────────────────┐  │
│  │                  Firewall Manager                        │  │
│  │  ┌─────────────┐ ┌──────────────┐ ┌─────────────────┐    │  │
│  │  │  iptables   │ │   nftables   │ │      pf         │    │  │
│  │  │   Backend   │ │   Backend    │ │   Backend       │    │  │
│  │  └─────────────┘ └──────────────┘ └─────────────────┘    │  │
│  └─────────────────────────┬────────────────────────────────┘  │
│                            │                                   │
│  ┌─────────────────────────▼────────────────────────────────┐  │
│  │            Multi-Channel Notification System             │  │
│  │    Telegram │ Slack │ Email │ Webhook │ Discord          │  │
│  └──────────────────────────────────────────────────────────┘  │
└────────────────────────────────────────────────────────────────┘

Component Overview

Component	Responsibility	Technology	Scalability
Log Monitor	Real-time log parsing and streaming	Go channels, fsnotify	Horizontal
Detection Engine	Threat analysis and classification	Regex, ML algorithms	Vertical
Firewall Manager	Rule application and management	System calls, netlink	Horizontal
Notification System	Alert distribution and escalation	HTTP clients, WebSockets	Horizontal
Web Dashboard	Management interface and analytics	HTTP server, static assets	Horizontal
Metrics Collector	Performance and security metrics	Prometheus client	Horizontal

---

Core Features

Threat Detection Engine

Advanced Pattern Recognition System

Machine Learning Integration

• Behavioral Analysis: Statistical anomaly detection using sliding windows
• Attack Vectorization: Feature extraction from HTTP requests
• Model Training: Continuous learning from threat patterns
• False Positive Reduction: Adaptive threshold adjustment

Pattern Matching Engine

# Example threat patterns
patterns:
  sql_injection:
    regex: "(?i)(union|select|insert|update|delete|drop|exec|script)"
    severity: 9
    categories: ["injection", "database"]
    
  xss_detection:
    regex: "(?i)(<script|javascript:|vbscript:|onload=|onerror=)"
    severity: 8
    categories: ["xss", "injection"]
    
  directory_traversal:
    regex: "(?i)(\\.\\.[\\/\\\\]|%2e%2e%2f|%252e%252e%252f)"
    severity: 7
    categories: ["path_traversal", "file_access"]

Rate Limiting Algorithm

type RateLimiter struct {
    Window    time.Duration
    Threshold int
    Algorithm string // "sliding_window", "token_bucket", "leaky_bucket"
}

Firewall Management

Multi-Backend Firewall System

Supported Backends

Backend	Platform	Features	Performance
iptables	Linux	Legacy compatibility, wide support	~10k rules/sec
nftables	Linux	Modern netfilter, better performance	~50k rules/sec
pf	FreeBSD/macOS	Advanced filtering, built-in NAT	~30k rules/sec
Windows Firewall	Windows	Native Windows integration	~5k rules/sec
Mock	All	Testing and development	Unlimited

Rule Management

type Rule struct {
    ID          string            `json:"id"`
    IP          string            `json:"ip"`
    Action      Action            `json:"action"`
    Duration    time.Duration     `json:"duration"`
    CreatedAt   time.Time         `json:"created_at"`
    ExpiresAt   time.Time         `json:"expires_at"`
    Reason      string            `json:"reason"`
    ThreatLevel string            `json:"threat_level"`
    Metadata    map[string]string `json:"metadata"`
}

Action Types

• BLOCK: Complete traffic blocking
• DROP: Silent packet dropping
• REJECT: Explicit connection rejection
• RATE_LIMIT: Bandwidth throttling
• TARPIT: Connection delay injection
• ALLOW: Whitelist override

Monitoring & Analytics

Real-time Dashboard and Metrics

Web Dashboard Features

• Real-time Threat Map: Geographic visualization of attacks
• Performance Metrics: Request processing and response times
• Rule Management: Interactive firewall rule configuration
• Log Analysis: Advanced filtering and search capabilities
• Alert Management: Notification configuration and history

Prometheus Metrics

# HELP nginx_defender_requests_total Total number of requests processed
# TYPE nginx_defender_requests_total counter
nginx_defender_requests_total{status="blocked",reason="sql_injection"} 1234

# HELP nginx_defender_response_duration_seconds Request processing duration
# TYPE nginx_defender_response_duration_seconds histogram
nginx_defender_response_duration_seconds_bucket{le="0.1"} 8932

WebSocket API

const ws = new WebSocket('ws://localhost:8080/ws');
ws.onmessage = function(event) {
    const data = JSON.parse(event.data);
    console.log('New threat detected:', data);
};

Notification System

Multi-Channel Alert Distribution

Supported Channels

Channel	Features	Configuration
Telegram	Rich formatting, bot integration	Bot token, chat ID
Slack	Channel posting, thread replies	Webhook URL, channel
Email	HTML templates, attachments	SMTP configuration
Webhook	Custom integrations, JSON payload	Endpoint URL, headers
Discord	Server notifications, embeds	Webhook URL
PagerDuty	Incident management, escalation	Integration key

Alert Severity Levels

severity_mapping:
  critical: 9-10    # Immediate response required
  high: 7-8         # Urgent attention needed
  medium: 4-6       # Standard monitoring
  low: 1-3          # Informational only

---

Technical Specifications

System Requirements

Minimum Requirements

hardware:
  cpu: "1 core (x86_64/ARM64)"
  memory: "256 MB RAM"
  storage: "100 MB disk space"
  network: "1 Mbps bandwidth"

software:
  os: "Linux 4.0+, macOS 10.15+, FreeBSD 12+"
  privileges: "root/administrator (for firewall management)"
  dependencies: "None (statically linked binary)"

Recommended Production Setup

hardware:
  cpu: "4+ cores (x86_64)"
  memory: "2+ GB RAM"
  storage: "10+ GB SSD"
  network: "100+ Mbps bandwidth"

software:
  os: "Linux 5.4+ (Ubuntu 20.04+, CentOS 8+)"
  kernel: "nftables support enabled"
  monitoring: "Prometheus + Grafana"

Performance Characteristics

Metric	Value	Notes
Log Processing	100k+ entries/sec	Single instance
Rule Application	50k+ rules/sec	nftables backend
Memory Usage	<100 MB	Base configuration
CPU Usage	<5%	Idle state
Response Time	<1ms	Rule matching
Concurrent Connections	10k+	Web dashboard

Network Architecture

┌─────────────┐    ┌─────────────┐    ┌─────────────┐
│   Client    │────│  nginx-     │────│  Backend    │
│  Traffic    │    │  defender   │    │  Services   │
└─────────────┘    └─────────────┘    └─────────────┘
                          │
                   ┌─────────────┐
                   │  Firewall   │
                   │   Rules     │
                   └─────────────┘

---

Installation

Binary Installation

Linux (x86_64)

# Download latest release
curl -L https://github.com/anipaleja/nginx-defender/releases/latest/download/nginx-defender-linux-amd64.tar.gz | tar -xz

# Install system-wide
sudo mv nginx-defender /usr/local/bin/
sudo chmod +x /usr/local/bin/nginx-defender

# Create configuration directory
sudo mkdir -p /etc/nginx-defender
sudo wget -O /etc/nginx-defender/config.yaml https://raw.githubusercontent.com/anipaleja/nginx-defender/main/config.yaml

# Create systemd service
sudo tee /etc/systemd/system/nginx-defender.service > /dev/null <<EOF
[Unit]
Description=nginx-defender WAF
After=network.target

[Service]
Type=simple
User=root
ExecStart=/usr/local/bin/nginx-defender -config /etc/nginx-defender/config.yaml
Restart=always
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

# Enable and start service
sudo systemctl enable nginx-defender
sudo systemctl start nginx-defender

macOS (Homebrew)

# Add tap (if available)
brew tap anipaleja/nginx-defender

# Install via Homebrew
brew install nginx-defender

# Start service
brew services start nginx-defender

Docker Deployment

Basic Docker Run

# Pull latest image
docker pull ghcr.io/anipaleja/nginx-defender:latest

# Run with host networking (recommended for firewall functionality)
docker run -d \
  --name nginx-defender \
  --network host \
  --cap-add NET_ADMIN \
  --cap-add NET_RAW \
  -v /var/log/nginx:/var/log/nginx:ro \
  -v ./config.yaml:/app/config.yaml:ro \
  ghcr.io/anipaleja/nginx-defender:latest

Docker Compose

version: '3.8'

services:
  nginx-defender:
    image: ghcr.io/anipaleja/nginx-defender:latest
    container_name: nginx-defender
    restart: unless-stopped
    network_mode: host
    cap_add:
      - NET_ADMIN
      - NET_RAW
    volumes:
      - /var/log/nginx:/var/log/nginx:ro
      - ./config.yaml:/app/config.yaml:ro
      - ./data:/app/data
    environment:
      - LOG_LEVEL=info
      - DRY_RUN=false
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:8080/health"]
      interval: 30s
      timeout: 10s
      retries: 3

  prometheus:
    image: prom/prometheus:latest
    container_name: prometheus
    ports:
      - "9090:9090"
    volumes:
      - ./prometheus.yml:/etc/prometheus/prometheus.yml
    command:
      - '--config.file=/etc/prometheus/prometheus.yml'
      - '--storage.tsdb.path=/prometheus'
      - '--web.console.libraries=/etc/prometheus/console_libraries'
      - '--web.console.templates=/etc/prometheus/consoles'

  grafana:
    image: grafana/grafana:latest
    container_name: grafana
    ports:
      - "3000:3000"
    environment:
      - GF_SECURITY_ADMIN_PASSWORD=admin
    volumes:
      - grafana-storage:/var/lib/grafana

volumes:
  grafana-storage:

Kubernetes Deployment

Complete Kubernetes Manifests

Namespace and ConfigMap

apiVersion: v1
kind: Namespace
metadata:
  name: nginx-defender
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-defender-config
  namespace: nginx-defender
data:
  config.yaml: |
    firewall:
      backend: "iptables"
      whitelist:
        - "10.0.0.0/8"
        - "172.16.0.0/12"
        - "192.168.0.0/16"
    
    detection:
      enabled: true
      patterns_file: "pkg/patterns/common.yaml"
      rate_limiting:
        enabled: true
        window: "1m"
        max_requests: 100
    
    server:
      host: "0.0.0.0"
      port: 8080
    
    metrics:
      enabled: true
      prometheus:
        enabled: true
        host: "0.0.0.0"
        port: 9090

DaemonSet Deployment

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: nginx-defender
  namespace: nginx-defender
spec:
  selector:
    matchLabels:
      app: nginx-defender
  template:
    metadata:
      labels:
        app: nginx-defender
    spec:
      hostNetwork: true
      hostPID: true
      containers:
      - name: nginx-defender
        image: ghcr.io/anipaleja/nginx-defender:latest
        imagePullPolicy: Always
        securityContext:
          privileged: true
          capabilities:
            add:
              - NET_ADMIN
              - NET_RAW
              - SYS_ADMIN
        ports:
        - containerPort: 8080
          name: web
        - containerPort: 9090
          name: metrics
        volumeMounts:
        - name: config
          mountPath: /app/config.yaml
          subPath: config.yaml
        - name: log-files
          mountPath: /var/log/nginx
          readOnly: true
        - name: proc
          mountPath: /host/proc
          readOnly: true
        - name: sys
          mountPath: /host/sys
          readOnly: true
      volumes:
      - name: config
        configMap:
          name: nginx-defender-config
      - name: log-files
        hostPath:
          path: /var/log/nginx
      - name: proc
        hostPath:
          path: /proc
      - name: sys
        hostPath:
          path: /sys
      tolerations:
      - operator: Exists
        effect: NoSchedule

Service and Ingress

apiVersion: v1
kind: Service
metadata:
  name: nginx-defender-service
  namespace: nginx-defender
spec:
  selector:
    app: nginx-defender
  ports:
  - name: web
    port: 8080
    targetPort: 8080
  - name: metrics
    port: 9090
    targetPort: 9090
  type: ClusterIP
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: nginx-defender-ingress
  namespace: nginx-defender
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
  - host: nginx-defender.example.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: nginx-defender-service
            port:
              number: 8080

---

Configuration

Configuration File Structure

Complete Configuration Reference

# nginx-defender configuration file
# Version: 2.0

# Firewall configuration
firewall:
  # Backend type: iptables, nftables, pf, mock
  backend: "iptables"
  
  # Whitelisted IP addresses and ranges
  whitelist:
    - "127.0.0.1"
    - "::1"
    - "192.168.0.0/16"
    - "10.0.0.0/8"
    - "172.16.0.0/12"
  
  # Default action for threats
  default_action: "BLOCK"
  
  # Rule cleanup interval
  cleanup_interval: "5m"
  
  # Maximum number of rules
  max_rules: 10000

# Threat detection configuration
detection:
  enabled: true
  
  # Machine learning model file (optional)
  ml_model: "/app/models/threat_detection.model"
  
  # Threat patterns file
  patterns_file: "pkg/patterns/common.yaml"
  
  # Rate limiting configuration
  rate_limiting:
    enabled: true
    window: "1m"
    max_requests: 100
    algorithm: "sliding_window"
  
  # Geographic blocking
  geo_blocking:
    enabled: true
    blocked_countries: ["CN", "RU", "KP"]
    allowed_countries: []
    geoip_database: "/app/data/GeoLite2-City.mmdb"
  
  # Honeypot integration
  honeypot:
    enabled: false
    boost_factor: 2.0
    services: ["ssh", "http", "ftp"]

# Log monitoring configuration
logs:
  level: "info"
  format: "json"
  output: "stdout"
  
  # Log sources to monitor
  sources:
    - path: "/var/log/nginx/access.log"
      format: "combined"
      follow: true
    - path: "/var/log/nginx/error.log"
      format: "error"
      follow: true
    - path: "/var/log/apache2/access.log"
      format: "combined"
      follow: false

# Web server configuration
server:
  host: "0.0.0.0"
  port: 8080
  
  # TLS configuration
  tls:
    enabled: false
    cert_file: "/app/certs/server.crt"
    key_file: "/app/certs/server.key"
  
  # CORS configuration
  cors:
    enabled: true
    allowed_origins: ["*"]
    allowed_methods: ["GET", "POST", "PUT", "DELETE"]

# Metrics and monitoring
metrics:
  enabled: true
  
  # Prometheus configuration
  prometheus:
    enabled: true
    host: "0.0.0.0"
    port: 9090
    path: "/metrics"
  
  # Performance monitoring
  performance:
    enabled: true
    interval: "30s"

# Notification configuration
notifications:
  enabled: true
  
  # Notification channels
  channels:
    console:
      enabled: true
      level: "info"
    
    email:
      enabled: false
      smtp_host: "smtp.example.com"
      smtp_port: 587
      username: "alerts@example.com"
      password: "password"
      to: ["admin@example.com"]
      subject_prefix: "[nginx-defender]"
    
    telegram:
      enabled: false
      bot_token: "BOT_TOKEN"
      chat_id: "CHAT_ID"
    
    slack:
      enabled: false
      webhook_url: "WEBHOOK_URL"
      channel: "#security"
      username: "nginx-defender"
    
    webhook:
      enabled: false
      url: "https://api.example.com/webhooks/security"
      headers:
        Authorization: "Bearer TOKEN"
        Content-Type: "application/json"

# Clustering configuration (Enterprise)
clustering:
  enabled: false
  node_id: "node-1"
  discovery:
    method: "static"
    endpoints: ["node-2:8081", "node-3:8081"]
  
  # Distributed rule synchronization
  sync:
    enabled: true
    interval: "10s"

Environment Variables

Variable	Description	Default
NGINX_DEFENDER_CONFIG	Configuration file path	config.yaml
NGINX_DEFENDER_LOG_LEVEL	Log level (debug, info, warn, error)	info
NGINX_DEFENDER_DRY_RUN	Enable dry-run mode	false
NGINX_DEFENDER_BACKEND	Firewall backend override	-
NGINX_DEFENDER_WEB_PORT	Web server port	8080
NGINX_DEFENDER_METRICS_PORT	Metrics server port	9090

---

API Reference

REST API Endpoints

Complete API Documentation

System Information

GET /api/v1/status

Response:

{
  "status": "healthy",
  "version": "2.0.0",
  "uptime": "2h30m15s",
  "build_info": {
    "version": "v2.0.0",
    "commit": "abc123",
    "build_time": "2025-07-27T10:00:00Z"
  }
}

Firewall Rules Management

GET /api/v1/rules
POST /api/v1/rules
DELETE /api/v1/rules/{id}

Create Rule:

{
  "ip": "192.168.1.100",
  "action": "BLOCK",
  "duration": "1h",
  "reason": "SQL injection attempt",
  "metadata": {
    "threat_level": "high",
    "pattern": "sql_injection"
  }
}

Statistics and Metrics

GET /api/v1/stats
GET /api/v1/metrics

Statistics Response:

{
  "firewall": {
    "backend": "iptables",
    "total_rules": 1234,
    "active_rules": 987,
    "expired_rules": 247
  },
  "detection": {
    "total_requests": 50000,
    "blocked_requests": 1234,
    "threat_detections": {
      "sql_injection": 456,
      "xss": 234,
      "brute_force": 344
    }
  },
  "performance": {
    "avg_response_time": "0.5ms",
    "memory_usage": "89MB",
    "cpu_usage": "3.2%"
  }
}

Configuration Management

GET /api/v1/config
PUT /api/v1/config
POST /api/v1/config/reload

Log Analysis

GET /api/v1/logs?limit=100&level=error
GET /api/v1/threats?since=1h&severity=high

WebSocket API

Real-time Event Streaming

Connection

const ws = new WebSocket('ws://localhost:8080/ws');

Event Types

// Threat detection event
{
  "type": "threat_detected",
  "timestamp": "2025-07-27T12:00:00Z",
  "data": {
    "ip": "192.168.1.100",
    "threat_type": "sql_injection",
    "severity": 9,
    "blocked": true
  }
}

// Rule creation event
{
  "type": "rule_created",
  "timestamp": "2025-07-27T12:00:01Z",
  "data": {
    "rule_id": "rule-123",
    "ip": "192.168.1.100",
    "action": "BLOCK",
    "expires_at": "2025-07-27T13:00:01Z"
  }
}

// System metrics update
{
  "type": "metrics_update",
  "timestamp": "2025-07-27T12:00:00Z",
  "data": {
    "cpu_usage": 3.2,
    "memory_usage": 89,
    "active_connections": 1234
  }
}

---

Performance Benchmarks

Throughput Testing

Performance Test Results

Test Environment

• Hardware: Intel Xeon E5-2686v4 (4 cores), 16GB RAM
• OS: Ubuntu 22.04 LTS
• Network: 10Gbps Ethernet
• Backend: nftables

Results

Test Scenario	Throughput	Latency (p95)	CPU Usage	Memory Usage
Log Processing	150k entries/sec	2ms	15%	120MB
Pattern Matching	100k requests/sec	1ms	25%	95MB
Rule Application	75k rules/sec	0.5ms	10%	85MB
API Requests	50k requests/sec	5ms	20%	100MB
WebSocket Events	25k events/sec	3ms	12%	90MB

Scaling Characteristics

Log Processing Rate vs CPU Cores:
  1 core:  50k entries/sec
  2 cores: 95k entries/sec
  4 cores: 150k entries/sec
  8 cores: 180k entries/sec (diminishing returns)

Memory Optimization

Memory Usage Analysis

Component	Base Memory	Per Rule	Per Connection
Core Engine	45MB	64 bytes	2KB
Pattern Matcher	25MB	-	512 bytes
Web Server	15MB	-	4KB
Metrics Collector	10MB	128 bytes	1KB
Total Baseline	95MB	192 bytes	7.5KB

Memory Growth Projections

• 10k rules: ~97MB
• 100k rules: ~114MB
• 1M rules: ~287MB
• 10k concurrent connections: ~170MB

---

Security Considerations

Security Architecture

Security Design Principles

Defense in Depth

1. Input Validation: All user inputs are validated and sanitized
2. Principle of Least Privilege: Minimal required permissions
3. Fail-Safe Defaults: Secure defaults for all configurations
4. Complete Mediation: All access attempts are checked
5. Open Design: Security through design, not obscurity

Threat Model

graph LR
    A[External Attacker] -->|HTTP Requests| B[nginx-defender]
    C[Malicious Insider] -->|Config Changes| B
    D[Compromised System] -->|Local Access| B
    
    B -->|Validated Traffic| E[Protected Services]
    B -->|Blocked Traffic| F[Firewall Drop]
    B -->|Alerts| G[Security Team]

Security Controls

Layer	Control	Implementation
Network	Traffic filtering	iptables/nftables rules
Application	Input validation	Regex patterns, ML detection
Authentication	API access control	JWT tokens, API keys
Authorization	Role-based access	RBAC system
Audit	Activity logging	Structured logging, SIEM integration
Encryption	Data protection	TLS 1.3, AES-256

Vulnerability Management

Security Practices

Regular Security Assessments

• Static Analysis: Weekly automated scans
• Dynamic Testing: Monthly penetration testing
• Dependency Scanning: Daily vulnerability checks
• Configuration Audits: Quarterly security reviews

Incident Response

1. Detection: Automated threat detection and alerting
2. Analysis: Log correlation and forensic analysis
3. Containment: Automatic rule application and isolation
4. Recovery: System restoration and patch application
5. Lessons Learned: Post-incident review and improvements

Compliance Standards

• OWASP Top 10: Protection against common web vulnerabilities
• NIST Cybersecurity Framework: Risk management alignment
• ISO 27001: Information security management
• PCI DSS: Payment card industry compliance (where applicable)

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Development

Building from Source

Development Setup

Prerequisites

# Install Go 1.21+
curl -L https://go.dev/dl/go1.21.linux-amd64.tar.gz | sudo tar -C /usr/local -xz
export PATH=$PATH:/usr/local/go/bin

# Install development tools
go install github.com/golangci/golangci-lint/cmd/golangci-lint@latest
go install github.com/securecodewarrior/sast-scan@latest

Build Process

# Clone repository
git clone https://github.com/anipaleja/nginx-defender.git
cd nginx-defender

# Install dependencies
go mod download

# Run tests
go test -v ./...

# Build binary
go build -o nginx-defender ./cmd/nginx-defender

# Build for multiple platforms
make build-all

Development Workflow

# Run with hot reload
air -c .air.toml

# Run tests with coverage
go test -coverprofile=coverage.out ./...
go tool cover -html=coverage.out

# Lint code
golangci-lint run

# Security scan
gosec ./...

Contributing Guidelines

Contribution Process

Code Standards

• Go Style: Follow effective Go guidelines
• Documentation: Comprehensive godoc comments
• Testing: Minimum 80% test coverage
• Performance: Benchmark critical paths
• Security: Static analysis and vulnerability scanning

Pull Request Process

1. Fork the repository
2. Create feature branch (git checkout -b feature/amazing-feature)
3. Commit changes (git commit -m 'Add amazing feature')
4. Push to branch (git push origin feature/amazing-feature)
5. Open Pull Request with detailed description

Issue Reporting

## Bug Report Template

**Environment:**
- OS: [e.g., Ubuntu 22.04]
- Version: [e.g., v2.0.0]
- Backend: [e.g., iptables]

**Steps to Reproduce:**
1. Configuration used
2. Command executed
3. Expected vs actual behavior

**Logs:**

[Paste relevant logs here]

**Additional Context:**
[Any other relevant information]

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License

This project is licensed under the MIT License - see the LICENSE file for details.

Third-Party Licenses

Open Source Dependencies

Dependency	License	Usage
gorilla/mux	BSD-3-Clause	HTTP routing
gorilla/websocket	BSD-2-Clause	WebSocket support
sirupsen/logrus	MIT	Structured logging
prometheus/client_golang	Apache-2.0	Metrics collection
oschwald/geoip2-golang	ISC	Geographic lookup
go-telegram-bot-api/telegram-bot-api	MIT	Telegram integration
slack-go/slack	BSD-2-Clause	Slack integration

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nginx-defender - Protecting the modern web, one request at a time.

Documentation • Community • Security