This document outlines the comprehensive security measures implemented in the Portfolio Tracker application.

1. Security Architecture
2. Input Sanitization
3. Rate Limiting & DDoS Protection
4. HTTPS/TLS Configuration
5. Database Security
6. Security Headers
7. Authentication & Authorization
8. Security Auditing
9. Graceful Shutdown
10. Security Testing
11. Production Deployment
12. Incident Response

The Portfolio Tracker implements a multi-layered security approach:

┌─────────────────────────────────────────────────────────────┐
│                    Load Balancer/CDN                        │
│                  (DDoS Protection)                          │
└─────────────────────────┬───────────────────────────────────┘
                          │
┌─────────────────────────▼───────────────────────────────────┐
│                   API Gateway                               │
│  • Rate Limiting        • Security Headers                 │
│  • Input Sanitization   • CORS Configuration               │
│  • Request Validation   • SSL Termination                  │
└─────────────────────────┬───────────────────────────────────┘
                          │
┌─────────────────────────▼───────────────────────────────────┐
│                 Microservices                               │
│  • Authentication       • Input Validation                 │
│  • Authorization        • Database Security                │
│  • Audit Logging        • Graceful Shutdown                │
└─────────────────────────┬───────────────────────────────────┘
                          │
┌─────────────────────────▼───────────────────────────────────┐
│                   Data Layer                                │
│  • Connection Pooling   • Encrypted Connections            │
│  • Query Optimization   • Access Controls                  │
│  • Backup Encryption    • Audit Trails                     │
└─────────────────────────────────────────────────────────────┘

The application implements comprehensive input sanitization using the InputSanitizer class:

import { SanitizationMiddleware } from '@portfolio/shared-types';

// Apply to all routes
app.use(
  SanitizationMiddleware.sanitizeAll({
    allowHtml: false,
    maxLength: 5000,
    trimWhitespace: true,
    escapeHtml: true,
  })
);

• XSS Prevention: HTML entities are escaped or stripped
• SQL Injection Prevention: Parameterized queries and identifier validation
• Path Traversal Protection: File path sanitization
• Command Injection Prevention: Shell command character filtering
• Length Limits: Configurable maximum input lengths
• Type Validation: Strict type checking for all inputs

// Safe identifier sanitization
const columnName = SQLInjectionPrevention.sanitizeIdentifier(userInput);

// Safe parameter binding
const results = await db.query('SELECT * FROM users WHERE email = ?', [
  sanitizedEmail,
]);

1. General API: 2000 requests per 15 minutes
2. Authentication: 5 requests per 15 minutes
3. Public Endpoints: Higher limits for non-sensitive operations

• Progressive Delays: Slow down responses for suspicious activity
• IP Blocking: Temporary blocks for repeated violations
• Pattern Detection: Identify and block malicious request patterns
• Request Size Limits: Prevent large payload attacks
• Connection Limits: Limit concurrent connections per IP

const ddosConfig = {
  rateLimits: {
    general: { windowMs: 15 * 60 * 1000, max: 2000 },
    auth: { windowMs: 15 * 60 * 1000, max: 5 },
    api: { windowMs: 15 * 60 * 1000, max: 1000 },
  },
  suspiciousActivity: {
    maxFailedAttempts: 5,
    blockDurationMs: 3600000, // 1 hour
  },
};

Generate development certificates:

./scripts/generate-ssl-certs.sh

For production, use Let's Encrypt:

certbot certonly --standalone -d yourdomain.com

• Protocol: TLS 1.2+ only
• Cipher Suites: Strong ciphers only (ECDHE, AES-GCM)
• HSTS: Enabled with preload
• Certificate Transparency: Monitored
• OCSP Stapling: Recommended for production

HTTPS_ENABLED=true
HTTPS_KEY_PATH=/path/to/private.key
HTTPS_CERT_PATH=/path/to/certificate.crt

• Encrypted Connections: SSL/TLS for all database connections
• Connection Pooling: Optimized and secure connection management
• Authentication: Strong credentials and certificate-based auth
• Network Isolation: Database servers in private networks

const mysqlConfig = {
  ssl: {
    ca: process.env.MYSQL_SSL_CA,
    cert: process.env.MYSQL_SSL_CERT,
    key: process.env.MYSQL_SSL_KEY,
    rejectUnauthorized: true,
  },
  connectionLimit: 100,
  multipleStatements: false, // Prevent SQL injection
};

const mongoConfig = {
  uri: 'mongodb://user:pass@host:27017/db?authSource=admin&ssl=true',
  ssl: true,
  authSource: 'admin',
  maxPoolSize: 200,
};

const redisConfig = {
  tls: {
    ca: process.env.REDIS_TLS_CA,
    cert: process.env.REDIS_TLS_CERT,
    key: process.env.REDIS_TLS_KEY,
  },
  password: process.env.REDIS_PASSWORD,
};

• Content-Security-Policy: Prevents XSS and code injection
• Strict-Transport-Security: Enforces HTTPS
• X-Frame-Options: Prevents clickjacking
• X-Content-Type-Options: Prevents MIME sniffing
• X-XSS-Protection: Browser XSS protection
• Referrer-Policy: Controls referrer information
• Permissions-Policy: Restricts browser features

const cspDirectives = {
  defaultSrc: ["'self'"],
  styleSrc: ["'self'", "'unsafe-inline'", 'https://fonts.googleapis.com'],
  scriptSrc: ["'self'"],
  imgSrc: ["'self'", 'data:', 'https:', 'blob:'],
  connectSrc: ["'self'", 'wss:', 'ws:'],
  objectSrc: ["'none'"],
  frameAncestors: ["'none'"],
};

• Strong Secrets: Minimum 32 character secrets
• Short Expiration: 15-minute access tokens
• Refresh Tokens: 7-day refresh tokens with rotation
• Secure Storage: HttpOnly cookies for refresh tokens
• Token Validation: Comprehensive token verification

• Hashing: bcrypt with salt rounds ≥ 12
• Complexity: Minimum requirements enforced
• Breach Detection: Check against known breached passwords
• Rate Limiting: Strict limits on authentication attempts

The security auditor logs various security events:

• Failed authentication attempts
• Rate limit violations
• Suspicious request patterns
• SQL injection attempts
• XSS attempts
• Unauthorized access attempts

const auditConfig = {
  alertThresholds: {
    failedAuthAttempts: 5,
    suspiciousRequests: 10,
    rateLimitViolations: 20,
  },
};

Security logs are structured JSON for easy analysis:

{
  "id": "sec_1234567890_abcd1234",
  "timestamp": "2024-01-01T12:00:00Z",
  "type": "FAILED_AUTHENTICATION",
  "severity": "MEDIUM",
  "source": {
    "ip": "192.168.1.100",
    "userAgent": "Mozilla/5.0...",
    "userId": null
  },
  "details": {
    "method": "POST",
    "url": "/auth/login",
    "statusCode": 401
  }
}

const gracefulShutdown = new GracefulShutdown({
  timeout: 30000,
  signals: ['SIGTERM', 'SIGINT', 'SIGUSR2'],
});

// Add shutdown handlers
gracefulShutdown.addHandlers([
  { name: 'database-disconnect', handler: () => db.disconnect() },
  { name: 'cache-disconnect', handler: () => redis.disconnect() },
  { name: 'cleanup-temp-files', handler: () => cleanupTempFiles() },
]);

1. Stop accepting new connections
2. Wait for existing requests to complete
3. Close database connections
4. Clean up resources
5. Exit process

Run the security audit script:

./scripts/security-audit.sh

1. SQL Injection: Test with common payloads
2. XSS: Test with script injection attempts
3. Path Traversal: Test with directory traversal attempts
4. Rate Limiting: Test with rapid requests
5. Authentication: Test with invalid tokens

Use the built-in penetration testing utilities:

import { PenetrationTestingUtils } from '@portfolio/shared-types';

const result = PenetrationTestingUtils.comprehensiveSecurityTest(userInput);
if (result.overallRisk === 'HIGH' || result.overallRisk === 'CRITICAL') {
  // Block request and log incident
}

• SSL certificates installed and valid
• Environment variables configured
• Database connections secured
• Rate limiting configured
• Security headers enabled
• Audit logging configured
• Backup systems tested
• Monitoring alerts configured

Copy and configure the production environment file:

cp .env.production.example .env.production
# Edit .env.production with your actual values

For production with Let's Encrypt:

# Install certbot
sudo apt-get install certbot

# Generate certificate
sudo certbot certonly --standalone -d yourdomain.com

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

1. Create dedicated database users with minimal privileges
2. Enable SSL/TLS for all database connections
3. Configure firewalls to restrict database access
4. Set up automated backups with encryption
5. Enable audit logging for database operations

1. Authentication Bypass
2. Data Breach
3. DDoS Attack
4. SQL Injection
5. XSS Attack
6. Unauthorized Access

1. Immediate Response

   • Identify and contain the threat
   • Block malicious IPs if necessary
   • Preserve evidence and logs

2. Investigation

   • Analyze security logs
   • Determine scope of impact
   • Identify root cause

3. Recovery

   • Apply security patches
   • Update configurations
   • Restore from backups if needed

4. Post-Incident

   • Document lessons learned
   • Update security procedures
   • Implement additional controls

• Security Team: security@yourdomain.com
• System Administrator: admin@yourdomain.com
• On-Call Engineer: +1-XXX-XXX-XXXX

• Security Audit Logs: /var/log/portfolio-tracker/security-audit.log
• Application Logs: /var/log/portfolio-tracker/app.log
• Access Logs: /var/log/nginx/access.log
• Error Logs: /var/log/nginx/error.log

• Failed authentication attempts per hour
• Rate limit violations per hour
• Suspicious request patterns
• Database connection failures
• SSL certificate expiration dates

• Critical: > 10 failed auth attempts in 5 minutes
• High: > 50 rate limit violations in 15 minutes
• Medium: > 100 suspicious requests in 1 hour
• Low: SSL certificate expires in < 30 days

• Prometheus: Metrics collection
• Grafana: Visualization and alerting
• ELK Stack: Log analysis
• Custom Security Dashboard: Real-time security status

• OWASP Top 10: All vulnerabilities addressed
• NIST Cybersecurity Framework: Implemented controls
• ISO 27001: Security management practices
• SOC 2: Security and availability controls

• Monthly: Security metrics review
• Quarterly: Penetration testing
• Annually: Full security audit
• As needed: Incident response reviews

For security-related questions or to report vulnerabilities:

• Email: security@portfoliotracker.com
• PGP Key: Available at https://portfoliotracker.com/.well-known/pgp-key.txt
• Bug Bounty: https://portfoliotracker.com/security/bug-bounty

This document is regularly updated to reflect the current security posture of the Portfolio Tracker application.