security

Security Overview

Quick reference for security implementations in Interview Optimiser.

🔐 Implemented Security Features

CSRF Protection

• Status: ✅ Implemented
• Pattern: Double-submit cookie with signed tokens
• Quick Use: Replace fetch() with secureFetch()

Webhook Security

• Status: ✅ Implemented
• Pattern: HMAC signature verification
• Providers: Clerk, Stripe, custom webhooks

Rate Limiting

• Status: ✅ Implemented
• Backend: Upstash Redis
• Limits: 60 req/min (API), 10 req/10min (uploads)

🛡️ Security Checklist

Authentication & Authorization

• ✅ Clerk authentication integrated
• ✅ User session management
• ✅ Role-based access control (via organizations)
• ✅ Secure token storage

API Security

• ✅ CSRF protection on state-changing requests
• ✅ Rate limiting on all endpoints
• ✅ Input validation with Zod schemas
• ✅ SQL injection prevention (Drizzle ORM)
• ✅ XSS protection (React automatic escaping)

Data Protection

• ✅ HTTPS enforced in production
• ✅ Secure cookies with httpOnly, secure, sameSite
• ✅ Environment variables via Doppler
• ✅ S3 presigned URLs for file access
• ✅ Database connection pooling

Monitoring & Logging

• ✅ Sentry error tracking
• ✅ Structured logging with Pino
• ⚠️ Security event logging (partial)
• ⚠️ Audit trail (planned)

🚨 Security Response

Reporting Security Issues

1. DO NOT create public GitHub issues
2. Email security concerns to: interviewoptimiser@bhekani.com
3. Include: Description, steps to reproduce, impact assessment

Common Security Tasks

Rotate CSRF Secret

# Generate new secret
openssl rand -base64 32

# Update in Doppler
doppler secrets set CSRF_SECRET=<new-secret>

# Restart application

Update Rate Limits

Edit src/lib/rate-limit.ts:

export const rateLimits = {
  api: { requests: 60, window: 60 },
  upload: { requests: 10, window: 600 },
  // Add custom limits here
};

Verify Webhook Signatures

All webhooks automatically verify signatures. To add a new provider:

1. Add verification logic to src/lib/webhook-security.ts
2. Configure secret in Doppler
3. Test with webhook testing tool

📋 Security Audit Log

Latest Audit: July 2025

• Report: security-audit-report.md
• Critical Issues: 0
• High Issues: 2 (fixed)
• Medium Issues: 5 (3 fixed, 2 in progress)
• Low Issues: 8 (monitoring)

Recent Security Updates

• 2025-09: Migrated from Vercel KV to Upstash Redis for rate limiting
• 2025-08: Implemented CSRF protection across all endpoints
• 2025-07: Added webhook signature verification
• 2025-06: Initial security audit completed

🔗 Quick Links

• OWASP Top 10 Checklist
• Next.js Security Best Practices
• Clerk Security Documentation
• AWS S3 Security Best Practices

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For detailed implementation guides, see the individual security documentation files linked above.