Security Guidelines

Overview

This document outlines security best practices and requirements for all development projects.

Authentication & Authorization

1. Password Requirements

• Minimum 12 characters
• Mix of uppercase and lowercase
• Include numbers and symbols
• No common patterns
• Check against breached passwords

2. Token Management

interface TokenConfig {
  // JWT configuration
  jwtSecret: string;
  jwtExpiry: number;
  refreshTokenExpiry: number;
  
  // Session configuration
  sessionTimeout: number;
  maxSessions: number;
}

// Token generation
function generateToken(user: User, config: TokenConfig): string {
  return jwt.sign(
    {
      sub: user.id,
      scope: user.permissions,
    },
    config.jwtSecret,
    { expiresIn: config.jwtExpiry }
  );
}

3. Role-Based Access Control

enum Permission {
  READ = 'read',
  WRITE = 'write',
  DELETE = 'delete',
  ADMIN = 'admin',
}

interface Role {
  name: string;
  permissions: Permission[];
}

// Authorization middleware
function authorize(requiredPermissions: Permission[]) {
  return (req: Request, res: Response, next: NextFunction) => {
    // Authorization logic
  };
}

Data Protection

1. Encryption

// Data encryption
interface EncryptionConfig {
  algorithm: string;
  keySize: number;
  ivSize: number;
}

class Encryption {
  private key: Buffer;
  
  constructor(config: EncryptionConfig) {
    this.key = crypto.randomBytes(config.keySize);
  }
  
  encrypt(data: string): string {
    // Encryption logic
  }
  
  decrypt(encrypted: string): string {
    // Decryption logic
  }
}

2. Data Masking

interface MaskingRules {
  email: RegExp;
  phone: RegExp;
  creditCard: RegExp;
}

function maskSensitiveData(data: any, rules: MaskingRules): any {
  // Data masking logic
}

3. Secure Configuration

interface SecurityConfig {
  // Environment variables
  NODE_ENV: string;
  API_KEYS: string[];
  DATABASE_URL: string;
  
  // Security settings
  CORS_ORIGINS: string[];
  RATE_LIMIT: number;
  MAX_PAYLOAD_SIZE: number;
}

Input Validation

1. Request Validation

interface ValidationRules {
  required?: boolean;
  type?: string;
  min?: number;
  max?: number;
  pattern?: RegExp;
  custom?: (value: any) => boolean;
}

function validateRequest(data: any, rules: ValidationRules): boolean {
  // Validation logic
}

2. SQL Injection Prevention

// Use parameterized queries
const query = 'SELECT * FROM users WHERE id = ?';
const params = [userId];

// Never use string concatenation
// BAD: const query = `SELECT * FROM users WHERE id = ${userId}`;

3. XSS Prevention

function sanitizeHtml(input: string): string {
  // HTML sanitization logic
}

// Content Security Policy
app.use(helmet.contentSecurityPolicy({
  directives: {
    defaultSrc: ["'self'"],
    scriptSrc: ["'self'"],
    styleSrc: ["'self'"],
    imgSrc: ["'self'"],
  },
}));

Secure Communication

1. HTTPS Configuration

const httpsOptions = {
  key: fs.readFileSync('private.key'),
  cert: fs.readFileSync('certificate.crt'),
  ca: fs.readFileSync('ca.crt'),
};

https.createServer(httpsOptions, app);

2. API Security

// Rate limiting
app.use(rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 100 // limit each IP to 100 requests per windowMs
}));

// Request size limiting
app.use(express.json({ limit: '10kb' }));

3. CORS Configuration

app.use(cors({
  origin: process.env.ALLOWED_ORIGINS.split(','),
  methods: ['GET', 'POST', 'PUT', 'DELETE'],
  allowedHeaders: ['Content-Type', 'Authorization'],
  credentials: true,
  maxAge: 86400, // 24 hours
}));

Security Monitoring

1. Logging

interface SecurityLog {
  timestamp: Date;
  level: 'info' | 'warn' | 'error';
  event: string;
  user?: string;
  ip?: string;
  details?: any;
}

function logSecurityEvent(log: SecurityLog): void {
  // Logging logic
}

2. Audit Trail

interface AuditEvent {
  user: string;
  action: string;
  resource: string;
  timestamp: Date;
  changes?: any;
}

function recordAudit(event: AuditEvent): void {
  // Audit recording logic
}

3. Alerts

interface SecurityAlert {
  severity: 'low' | 'medium' | 'high';
  type: string;
  message: string;
  context: any;
}

function triggerAlert(alert: SecurityAlert): void {
  // Alert triggering logic
}

Incident Response

1. Security Breach Protocol

1. Identify and isolate affected systems
2. Assess damage and data exposure
3. Notify relevant stakeholders
4. Implement fixes and patches
5. Document incident and response
6. Review and update security measures

2. Recovery Procedures

1. Backup restoration
2. System verification
3. Security patch application
4. User notification
5. Access token rotation
6. Documentation update

3. Prevention Measures

1. Regular security audits
2. Penetration testing
3. Code reviews
4. Security training
5. Policy updates
6. Monitoring improvements