SECURITY_FIXES_SUMMARY.md

Security Fixes Implementation Summary

✅ All Security Fixes Implemented

1. OMP_NUM_THREADS Validation ✅

File: flask_api_standalone.py

• Added validation on startup
• Defaults to 4 if invalid or missing
• Prevents "Invalid value" errors from libgomp

2. Production WSGI Server ✅

Files: Dockerfile, requirements.txt, flask_api_standalone.py

• Added Gunicorn to requirements.txt
• Updated Dockerfile to use Gunicorn
• Added warning when using Flask dev server
• Production script created: scripts/start_production.sh

3. Security Headers ✅

File: flask_api_standalone.py

• X-Content-Type-Options: nosniff
• X-Frame-Options: DENY
• X-XSS-Protection: 1; mode=block
• Strict-Transport-Security
• Content-Security-Policy
• Referrer-Policy

4. Rate Limiting ✅

Files: flask_api_standalone.py, requirements.txt

• Added Flask-Limiter
• Default limits: 200/day, 50/hour, 10/minute
• Endpoint-specific limits:
  • /api/chat: 10/minute
  • /api/initialize: 5/minute
• Configurable via RATE_LIMIT_ENABLED env var

5. Secure Logging ✅

File: flask_api_standalone.py

• Secure log directory (700 permissions)
• Secure log files (600 permissions)
• Rotating file handler (10MB, 5 backups)
• Sensitive data sanitization function
• Automatic redaction of tokens, passwords, keys

6. Database Indexes ✅

File: src/database.py

• Index on sessions.last_activity
• Index on interactions.session_id
• Index on interactions.created_at
• Automatic index creation on database init

7. Environment Variables ✅

Files: Dockerfile, SECURITY_CONFIGURATION.md

• Updated Dockerfile with valid OMP_NUM_THREADS
• Added LOG_DIR environment variable
• Added RATE_LIMIT_ENABLED environment variable
• Created security configuration documentation

Files Modified

1. ✅ requirements.txt - Added Gunicorn and Flask-Limiter
2. ✅ flask_api_standalone.py - All security features
3. ✅ src/database.py - Database indexes
4. ✅ Dockerfile - Production server and env vars
5. ✅ scripts/start_production.sh - Production startup script
6. ✅ SECURITY_CONFIGURATION.md - Security documentation

Testing Checklist

• OMP_NUM_THREADS validation works
• Security headers are present
• Rate limiting is functional
• Logging is secure
• Database indexes are created
• Gunicorn configuration is correct
• Production script validates environment

Next Steps

1. Test locally with Gunicorn:

   gunicorn flask_api_standalone:app
   

2. Verify security headers:

   curl -I http://localhost:7860/api/health
   

3. Test rate limiting:

   # Make 11 requests quickly - 11th should be rate limited
   

4. Deploy to HF Spaces - Dockerfile will use Gunicorn automatically

5. Run security audit:

   chmod +x scripts/security_audit.sh
   ./scripts/security_audit.sh
   

6. Check security configuration:

   chmod +x scripts/security_check.sh
   ./scripts/security_check.sh
   

Future Enhancements

See SECURITY_ROADMAP.md for detailed security enhancement roadmap including:

• Advanced security headers (Phase 1 - Quick Win)
• SIEM integration (Phase 2)
• Continuous monitoring (Phase 3)
• Advanced rate limiting (Phase 4)
• Security audits & penetration testing (Phase 5)
• Secret management (Phase 6)
• Authentication & authorization (Phase 7)

Notes

• Flask dev server warnings are in place for development
• Rate limiting can be disabled via RATE_LIMIT_ENABLED=false (not recommended)
• All sensitive data in logs is automatically sanitized
• Database indexes improve query performance significantly