Security Implementation Guide

Overview

This guide covers security best practices for the TrafficPOS system, focusing on secure connections, data protection, authentication, and compliance with cannabis industry and payment card industry standards.

Transport Layer Security

HTTPS/TLS Configuration

Frontend Deployment - Nginx Configuration:

# Nginx configuration for secure frontend
server {
    listen 443 ssl http2;
    server_name pos.yourdomain.com;
    
    # Modern SSL configuration
    ssl_certificate /etc/letsencrypt/live/pos.yourdomain.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/pos.yourdomain.com/privkey.pem;
    
    # TLS 1.2 and 1.3 only
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384;
    ssl_prefer_server_ciphers off;
    
    # HSTS
    add_header Strict-Transport-Security "max-age=31536000" always;
    
    # Security headers
    add_header X-Frame-Options DENY;
    add_header X-Content-Type-Options nosniff;
    add_header X-XSS-Protection "1; mode=block";
    add_header Referrer-Policy "strict-origin-when-cross-origin";
}

Certificate Management

# Install certbot
sudo apt-get install certbot python3-certbot-nginx

# Obtain certificate
sudo certbot --nginx -d pos.yourdomain.com

# Auto-renewal
sudo crontab -e
# Add: 0 12 * * * /usr/bin/certbot renew --quiet

Authentication & Authorization

Role-Based Access Control (RBAC)

Authentication Implementation

Frontend Authentication Flow:

// Authentication service implementation
class AuthService {
  async login(credentials) {
    // Validate credentials locally (offline mode)
    // Or authenticate with API (online mode)
    const result = await this.validateCredentials(credentials);
    
    if (result.success) {
      // Store authentication state
      this.setAuthState(result.user, result.permissions);
      
      // Set session timeout
      this.startSessionTimeout();
    }
    
    return result;
  }
  
  validatePermissions(action, resource) {
    const user = this.getCurrentUser();
    return this.rbac.hasPermission(user.role, action, resource);
  }
}

Password Security

Password Hashing Implementation:

// Secure password hashing
import bcrypt from 'bcrypt';

class PasswordService {
  private readonly saltRounds = 12;
  
  async hashPassword(password: string): Promise<string> {
    return bcrypt.hash(password, this.saltRounds);
  }
  
  async verifyPassword(password: string, hash: string): Promise<boolean> {
    return bcrypt.compare(password, hash);
  }
  
  generateSecurePassword(): string {
    // Generate cryptographically secure password
    return crypto.randomBytes(16).toString('base64');
  }
}

Data Protection

Encryption at Rest

AES-256-GCM Implementation:

// Data encryption service
class EncryptionService {
  private readonly algorithm = 'aes-256-gcm';
  
  async encryptData(data: string, password: string): Promise<EncryptedData> {
    // Derive key from password using PBKDF2
    const salt = crypto.randomBytes(32);
    const key = await this.deriveKey(password, salt);
    
    // Generate random IV
    const iv = crypto.randomBytes(16);
    
    // Encrypt data
    const cipher = crypto.createCipher(this.algorithm, key);
    cipher.setAAD(Buffer.from('additional-auth-data'));
    
    let encrypted = cipher.update(data, 'utf8', 'hex');
    encrypted += cipher.final('hex');
    
    const authTag = cipher.getAuthTag();
    
    return {
      encrypted,
      salt: salt.toString('hex'),
      iv: iv.toString('hex'),
      authTag: authTag.toString('hex')
    };
  }
  
  private async deriveKey(password: string, salt: Buffer): Promise<Buffer> {
    return new Promise((resolve, reject) => {
      crypto.pbkdf2(password, salt, 100000, 32, 'sha256', (err, key) => {
        if (err) reject(err);
        else resolve(key);
      });
    });
  }
}

Sensitive Data Handling

Backup Security

API Security Implementation

Authentication Tokens

JWT Token Implementation:

// JWT token service
class TokenService {
  private readonly secret = process.env.JWT_SECRET;
  private readonly issuer = 'trafficpos-api';
  
  generateToken(user: User): string {
    const payload = {
      sub: user.id,
      iss: this.issuer,
      iat: Math.floor(Date.now() / 1000),
      exp: Math.floor(Date.now() / 1000) + (8 * 60 * 60), // 8 hours
      roles: user.roles,
      permissions: user.permissions
    };
    
    return jwt.sign(payload, this.secret, { algorithm: 'HS256' });
  }
  
  verifyToken(token: string): TokenPayload {
    return jwt.verify(token, this.secret, {
      issuer: this.issuer,
      algorithms: ['HS256']
    });
  }
}

API Rate Limiting

// Rate limiting implementation
app.use('/api', rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 100, // Limit each IP to 100 requests per windowMs
  message: 'Too many requests from this IP',
  standardHeaders: true,
  legacyHeaders: false,
}));

// Stricter limits for authentication endpoints
app.use('/api/auth', rateLimit({
  windowMs: 15 * 60 * 1000,
  max: 5, // Only 5 auth attempts per 15 minutes
  skipSuccessfulRequests: true
}));

Frontend Security

Content Security Policy

// CSP header configuration
const cspPolicy = {
  'default-src': ["'self'"],
  'script-src': ["'self'", "'unsafe-inline'", 'https://apis.google.com'],
  'style-src': ["'self'", "'unsafe-inline'", 'https://fonts.googleapis.com'],
  'font-src': ["'self'", 'https://fonts.gstatic.com'],
  'img-src': ["'self'", 'data:', 'https:'],
  'connect-src': ["'self'", 'https://api.openai.com'],
  'media-src': ["'self'"],
  'object-src': ["'none'"],
  'base-uri': ["'self'"],
  'form-action': ["'self'"],
  'frame-ancestors': ["'none'"]
};

Input Validation & Sanitization

Client-side Validation:

// Input validation service
class ValidationService {
  validateEmail(email: string): boolean {
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    return emailRegex.test(email) && email.length <= 254;
  }
  
  sanitizeInput(input: string): string {
    return input
      .replace(/&/g, '&')
      .replace(//g, '>')
      .replace(/"/g, '"')
      .replace(/'/g, ''')
      .replace(/\//g, '/');
  }
  
  validateCurrency(amount: string): boolean {
    const currencyRegex = /^\d+(\.\d{1,2})?$/;
    const numAmount = parseFloat(amount);
    return currencyRegex.test(amount) && numAmount >= 0 && numAmount <= 999999.99;
  }
}

Compliance & Auditing

Cannabis Industry Compliance

PCI DSS Compliance (If Processing Cards)

Audit Logging

Comprehensive Audit Trail:

// Audit logging service
class AuditService {
  async logEvent(event: AuditEvent): Promise<void> {
    const auditRecord = {
      timestamp: new Date().toISOString(),
      userId: event.userId,
      userRole: event.userRole,
      action: event.action,
      resource: event.resource,
      resourceId: event.resourceId,
      ipAddress: event.ipAddress,
      userAgent: event.userAgent,
      sessionId: event.sessionId,
      details: event.details,
      result: event.result // success/failure
    };
    
    // Store in tamper-evident log
    await this.storeAuditRecord(auditRecord);
    
    // Real-time alerting for critical events
    if (this.isCriticalEvent(event)) {
      await this.sendSecurityAlert(auditRecord);
    }
  }
  
  private isCriticalEvent(event: AuditEvent): boolean {
    const criticalActions = [
      'user_created', 'user_deleted', 'permissions_changed',
      'large_sale', 'void_transaction', 'backup_restored',
      'security_settings_changed'
    ];
    
    return criticalActions.includes(event.action);
  }
}

Security Monitoring & Incident Response

Real-time Security Monitoring

Incident Response Plan

Security Testing & Validation

Penetration Testing

• Annual Testing: Comprehensive penetration testing
• Vulnerability Scanning: Monthly automated scans
• Code Review: Security-focused code reviews
• Configuration Assessment: Security configuration validation

Security Training

• Employee Training: Security awareness and best practices
• Administrator Training: Advanced security procedures
• Incident Response Training: Response procedure drills
• Compliance Training: Regulatory requirement education

Related Security Resources