Session security improvements in AuthMiddleware:
1. Secure Cookie Configuration:
- HttpOnly flag prevents JavaScript access to session cookies
- Secure flag requires HTTPS (protects from MITM)
- SameSite=Strict prevents CSRF via cookie inclusion
- Strict mode rejects uninitialized session IDs
2. Session Fixation Prevention:
- session_regenerate_id(true) called after successful authentication
- Old session ID destroyed, new one generated
- Prevents attacker from using pre-set session ID
3. CSRF Token Regeneration:
- New CSRF token generated on login
- Ensures fresh token for each session
These changes protect against session hijacking, fixation, and
cross-site attacks while maintaining existing 5-hour timeout.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
