Security Documentation

Security Documentation

Table of Contents

• Overview
• When to Use
• Quick Start
• Reference Guides
• Best Practices

Overview

Create comprehensive security documentation including policies, guidelines, compliance requirements, and best practices for secure application development and operations.

When to Use

• Security policies
• Compliance documentation (SOC 2, GDPR, HIPAA)
• Security guidelines and best practices
• Incident response plans
• Access control policies
• Data protection policies
• Vulnerability disclosure policies
• Security audit reports

Quick Start

Minimal working example:

# Security Policy

**Version:** 2.0
**Last Updated:** 2025-01-15
**Review Schedule:** Quarterly
**Owner:** Security Team
**Contact:** security@example.com

## Table of Contents

1. [Overview](#overview)
2. [Scope](#scope)
3. [Authentication & Access Control](#authentication--access-control)
4. [Data Protection](#data-protection)
5. [Application Security](#application-security)
6. [Infrastructure Security](#infrastructure-security)
7. [Incident Response](#incident-response)
8. [Compliance](#compliance)
9. [Security Training](#security-training)

---

## 1. Overview

### Purpose
// ... (see reference guides for full implementation)

Reference Guides

Detailed implementations in the references/ directory:

Best Practices

✅ DO

• Follow principle of least privilege
• Encrypt sensitive data
• Implement MFA everywhere
• Log security events
• Regular security audits
• Keep systems updated
• Document security policies
• Train employees regularly
• Have incident response plan
• Test backups regularly

❌ DON'T

• Store passwords in plaintext
• Skip input validation
• Ignore security headers
• Share credentials
• Hardcode secrets in code
• Skip security testing
• Ignore vulnerability reports

1 Password Requirements

1 Password Requirements

Minimum Requirements:

• Length: Minimum 12 characters
• Complexity: Mix of uppercase, lowercase, numbers, and symbols
• History: Cannot reuse last 5 passwords
• Expiration: 90 days (for privileged accounts)
• Lockout: 5 failed attempts triggers 30-minute lockout

Example Strong Password:

Good: MyC0mplex!Pass#2025
Bad: password123

Implementation:

// Password validation
function validatePassword(password) {
  const minLength = 12;
  const requirements = {
    length: password.length >= minLength,
    uppercase: /[A-Z]/.test(password),
    lowercase: /[a-z]/.test(password),
    number: /[0-9]/.test(password),
    special: /[!@#$%^&*(),.?":{}|<>]/.test(password)
  };

  return Object.values(requirements).every(Boolean);
}

1 Secure Coding Practices

1 Secure Coding Practices

Input Validation:

// ✅ Good - Validate and sanitize input
const validator = require("validator");

function createUser(req, res) {
  const { email, name } = req.body;

  // Validate email
  if (!validator.isEmail(email)) {
    return res.status(400).json({ error: "Invalid email" });
  }

  // Sanitize name
  const sanitizedName = validator.escape(name);

  // Use parameterized queries
  db.query("INSERT INTO users (email, name) VALUES ($1, $2)", [
    email,
    sanitizedName,
  ]);
}

// ❌ Bad - SQL injection vulnerability
function createUserBad(req, res) {
  const { email, name } = req.body;
  db.query(`INSERT INTO users VALUES ('${email}', '${name}')`);
}

XSS Prevention:

// Content Security Policy headers
app.use((req, res, next) => {
  res.setHeader(
    "Content-Security-Policy",
    "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline';",
  );
  next();
});

// Sanitize output
import DOMPurify from "isomorphic-dompurify";

function renderComment(comment) {
  const clean = DOMPurify.sanitize(comment, {
    ALLOWED_TAGS: ["b", "i", "em", "strong"],
    ALLOWED_ATTR: [],
  });
  return clean;
}

2 Multi-Factor Authentication (MFA)

2 Multi-Factor Authentication (MFA)

Requirements:

• Mandatory for:
• Production system access
• Administrative accounts
• Customer-facing applications
• VPN access
• Source code repositories

Supported Methods:

1. TOTP (Google Authenticator, Authy) 2. SMS (backup only, not primary) 3. Hardware tokens (YubiKey) 4. Biometric (fingerprint, Face ID)

Implementation:

// MFA verification
async function verifyMFA(userId, token) {
  const user = await User.findById(userId);
  const secret = user.twoFactorSecret;

  // Verify TOTP token
  const isValid = speakeasy.totp.verify({
    secret,
    encoding: "base32",
    token,
    window: 2, // Allow 1 minute time drift
  });

  if (isValid) {
    await logSecurityEvent("mfa_success", userId);
    return true;
  }

  await logSecurityEvent("mfa_failure", userId);
  return false;
}

2 Security Headers

2 Security Headers

// Security headers middleware
app.use((req, res, next) => {
  // Prevent clickjacking
  res.setHeader("X-Frame-Options", "DENY");

  // XSS protection
  res.setHeader("X-Content-Type-Options", "nosniff");
  res.setHeader("X-XSS-Protection", "1; mode=block");

  // HTTPS enforcement
  res.setHeader(
    "Strict-Transport-Security",
    "max-age=31536000; includeSubDomains",
  );

  // Referrer policy
  res.setHeader("Referrer-Policy", "strict-origin-when-cross-origin");

  next();
});

3 API Security

Rate Limiting:

const rateLimit = require("express-rate-limit");

const limiter = 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,
});

app.use("/api/", limiter);

---

3 Role-Based Access Control (RBAC)

3 Role-Based Access Control (RBAC)

Principle of Least Privilege: Users receive minimum access needed for their role.

Roles:

Implementation:

// Permission middleware
const requirePermission = (permission) => {
  return async (req, res, next) => {
    const user = req.user;
    const userPermissions = await getUserPermissions(user.role);

    if (!userPermissions.includes(permission)) {
      await logSecurityEvent("unauthorized_access", user.id, {
        permission,
        endpoint: req.path,
      });

      return res.status(403).json({
        error: "Insufficient permissions",
        required: permission,
      });
    }

    next();
  };
};

// Usage
app.delete("/api/users/:id", requirePermission("users:delete"), deleteUser);

---