This document outlines the security measures implemented in the application and provides guidelines for maintaining security best practices.

• Prevents XSS attacks by controlling resource loading
• Configured in src/middleware.ts
• Different policies for development and production
• Allows trusted sources for scripts, styles, and other resources

• Prevents abuse and DoS attacks
• Different limits for various endpoints:
  • API endpoints: 100 requests per minute
  • Authentication: 5 attempts per 15 minutes
  • Contact form: 3 submissions per hour
• IP-based tracking with automatic cleanup

• All user inputs are sanitized and validated
• Uses Zod for schema validation
• DOMPurify for HTML sanitization
• Removes dangerous characters and patterns

• Password strength requirements (8+ chars, complexity)
• Account lockout after failed attempts (5 attempts, 15min lockout)
• Secure session management with HTTP-only cookies
• JWT with proper expiration and validation

• X-Frame-Options: DENY - Prevents clickjacking
• X-Content-Type-Options: nosniff - Prevents MIME confusion
• X-XSS-Protection: 1; mode=block - XSS protection
• Strict-Transport-Security - HTTPS enforcement (production)
• Referrer-Policy: origin-when-cross-origin - Controls referrer info

• Configurable origin whitelist
• Proper preflight handling
• Credential support control
• Method and header restrictions

• Real-time security event logging
• Automatic alerting for suspicious patterns
• IP-based temporary blocking
• Integration with monitoring services

# Authentication secrets (32+ characters)
JWT_SECRET=your-jwt-secret-32-chars-minimum
SESSION_SECRET=your-session-secret-32-chars-minimum
NEXTAUTH_SECRET=your-nextauth-secret-32-chars-minimum

# API security (20+ characters)  
API_SECRET_KEY=your-api-secret-20-chars-minimum
WEBHOOK_SECRET=your-webhook-secret-20-chars-minimum

# Encryption (32+ characters)
ENCRYPTION_KEY=your-encryption-key-32-chars-minimum

# Database security
DATABASE_SSL=true

# Security features
ENABLE_RATE_LIMITING=true
ENABLE_CORS=true  
SECURITY_HEADERS=true
SECURITY_LOG_LEVEL=warn

# Monitoring
SECURITY_WEBHOOK_URL=https://your-monitoring-service.com/webhook

# Development only
DISABLE_HTTPS_REDIRECT=false

• Always validate and sanitize user inputs
• Use Zod schemas for validation
• Never trust client-side validation alone
• Implement server-side sanitization

import { sanitizeInput, sanitizedEmail } from '@/lib/sanitization';

// Sanitize strings
const cleanString = sanitizeInput(userInput, 'string');

// Use sanitized schemas
const schema = z.object({
  email: sanitizedEmail,
  message: sanitizedString(10, 1000),
});

• Implement strong password requirements
• Use secure session management
• Implement account lockout mechanisms
• Validate JWT tokens properly

import { PasswordSecurity, JWTSecurity } from '@/lib/auth-security';

// Hash passwords securely
const hashedPassword = await PasswordSecurity.hash(password);

// Create secure JWT tokens
const token = JWTSecurity.sign({ userId }, '1h');

• Apply security middleware to all API routes
• Use rate limiting for public endpoints
• Implement proper CORS policies
• Log security events

import { withSecurity } from '@/lib/api-security';
import { apiRateLimit } from '@/lib/rate-limit';

export const POST = withSecurity(
  async (request) => {
    // Your API logic
  },
  {
    rateLimiter: apiRateLimit,
    cors: true,
  }
);

• Encrypt sensitive data at rest
• Use HTTPS for all communications
• Implement proper CORS policies
• Validate SSL certificates

• Log security events consistently
• Monitor for suspicious patterns
• Set up alerts for critical events
• Regular security audits

import { securityMonitor, SecurityEventType } from '@/lib/security-monitor';

// Log security events
securityMonitor.logEvent({
  type: SecurityEventType.FAILED_LOGIN,
  severity: 'medium',
  message: 'Failed login attempt',
  ip: clientIP,
});

• Environment variables properly configured
• CSP headers configured and tested
• Rate limiting implemented on all public endpoints
• Input sanitization active on all forms
• Security monitoring enabled and configured
• HTTPS enforced in production
• Security headers configured and verified
• Authentication security implemented
• Password policies enforced
• Account lockout mechanisms active
• JWT tokens properly validated
• CORS policies configured
• Regular security audits performed
• Dependencies regularly updated

• Monitor security logs regularly
• Watch for unusual patterns in metrics
• Check monitoring alerts promptly
• Review failed authentication attempts

• Block malicious IPs temporarily
• Investigate the incident thoroughly
• Document findings and actions taken
• Notify relevant stakeholders

• Fix identified vulnerabilities
• Update security measures as needed
• Review and improve security processes
• Conduct post-incident analysis

# Test rate limiting
curl -X POST http://localhost:3000/api/contact \
  -H "Content-Type: application/json" \
  -d '{"email":"test@test.com","message":"test"}' \
  --rate 10

# Test input sanitization
curl -X POST http://localhost:3000/api/contact \
  -H "Content-Type: application/json" \
  -d '{"email":"<script>alert(1)</script>","message":"test"}'

# Test CSP
# Check browser developer tools for CSP violations

• Test XSS injection attempts
• Verify SQL injection protection
• Check CSRF protection
• Test authentication bypass attempts
• Verify authorization controls

• Use automated security scanners
• Perform dependency vulnerability scans
• Run OWASP ZAP or similar tools
• Conduct penetration testing

• Update dependencies monthly
• Monitor security advisories
• Apply security patches promptly
• Review and update security policies quarterly

# Check for vulnerabilities
npm audit

# Fix vulnerabilities
npm audit fix

# Check for outdated packages
npm outdated

• Set up alerts for dependency vulnerabilities
• Monitor CVE databases for relevant threats
• Subscribe to security newsletters
• Regular security training for team

• Implement data minimization
• Provide data export functionality
• Enable data deletion requests
• Maintain audit logs

• Clear privacy policy
• Cookie consent management
• Data processing transparency
• User consent tracking

For security issues or questions:

• Security team: security@yourapp.com
• Bug bounty: security-reports@yourapp.com

Do not disclose security vulnerabilities publicly.