lockbitchat 5437bef9c5 feat: Enhanced demo mode security and vulnerability fixes ...

- **Fixed demo mode timing attack vulnerability** - Added strict rate limiting and user fingerprinting
- **Eliminated replay attack vectors** - Implemented preimage tracking and expiration validation
- **Enhanced key reuse protection** - Added cryptographic validation and session isolation
- **Strengthened free tier abuse prevention** - Multi-layer cooldown system with global limits

- **Secure user fingerprinting** - Browser-based identification without privacy invasion
- **Global session limits** - Maximum 10 concurrent demo sessions across all users
- **Per-user daily limits** - 3 demo sessions per 24 hours with smart cooldown
- **Session completion tracking** - Prevents rapid reconnection abuse
- **Enhanced preimage generation** - Timestamped, versioned, and entropy-validated

- **Configurable security layers** - Individual toggle for encryption, obfuscation, and traffic features
- **Debug mode controls** - `window.DEBUG_MODE` for detailed logging and diagnostics
- **Emergency security disable** - Graceful fallback when advanced features cause issues
- **Vulnerability testing support** - Controlled security layer bypass for penetration testing

- **Cross-session compatibility** - Works seamlessly with both paid and free sessions
- **Real-time UI updates** - Synchronized timer display across all components
- **Session state management** - Automatic cleanup and notification system
- **Payment integration** - Smooth transition between demo and paid sessions

- **Layered security architecture** - 7+ configurable security features with independent controls
- **Traffic analysis protection** - Advanced obfuscation with fake traffic and packet padding
- **Connection state monitoring** - Enhanced logging for security audit and debugging
- **Fallback mechanisms** - Robust error handling with security-first degradation

- **Structured security logs** - Detailed audit trail for security events
- **Performance monitoring** - Connection state and encryption layer metrics
- **Attack detection logging** - Comprehensive tracking of security violations
- **Development diagnostics** - Enhanced debugging for faster development cycles

- Refactored `PayPerSessionManager` with enhanced security controls
- Added `generateUserFingerprint()` with privacy-preserving identification
- Implemented `checkDemoSessionLimits()` with multi-tier validation
- Enhanced `EnhancedSecureWebRTCManager` with configurable security layers
- Added emergency security disable functionality for testing environments
- Improved session timer with cross-component synchronization

**Breaking Changes:** None - All changes are backward compatible
**Security Impact:** High - Eliminates critical vulnerabilities in free tier
**Testing Impact:** Significantly improved - New debug modes and security layer controls

2025-08-14 23:34:54 -04:00

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