Bash MCP (Master Control Program)

# Bash MCP Development Master Plan This document outlines the development process for the TypeScript Bash MCP (Master Control Program), designed to allow Claude to safely execute bash commands. ## Project Overview The Bash MCP is a TypeScript application that enables controlled execution of bash commands with both stateless and stateful (interactive) sessions. It uses pseudoterminals for full interactive support and includes robust security features. ## Development Phases ### Phase 1: Project Setup and Basic Infrastructure ✅ - [x] Create project directory structure - [x] Initialize package.json - [x] Configure TypeScript (tsconfig.json) - [x] Set up linting and formatting (ESLint, Prettier) - [x] Create initial configuration file structure - [x] Set up logging infrastructure - [x] Write basic documentation ### Phase 2: Core Functionality - Command Execution ✅ - [x] Implement command validation utility - [x] Create basic command executor (non-interactive) - [x] Add timeout mechanism - [x] Implement directory restriction logic - [x] Add security sanitization for outputs - [x] Create the main MCP handler ### Phase 3: Session Management ✅ - [x] Design session management system - [x] Implement session creation and tracking - [x] Add session timeout functionality - [x] Create cleanup routines for expired sessions - [x] Implement session persistence between calls ### Phase 4: Interactive Command Support ✅ - [x] Integrate node-pty for pseudoterminal support - [x] Implement input/output streaming - [x] Create mechanism to detect when waiting for input - [x] Add interactive mode command handling - [x] Test with various interactive programs (vim, bash, etc.) ### Phase 5: Security Enhancements ✅ - [x] Implement comprehensive command validation - [x] Add sandboxing for sensitive operations - [x] Create detailed security logging - [x] Perform security review - [x] Add configurable security levels ### Phase 6: Testing and Documentation ✅ - [x] Write unit tests for core functionality - [x] Create integration tests - [x] Document API and configuration options - [x] Add usage examples - [x] Create troubleshooting guide ### Phase 7: Finalization ✅ - [x] Performance optimization - [x] Final security audit - [x] Complete documentation - [x] Version 1.0 release ## Implementation Details ### Key Components 1. **ConfigManager**: Loads and validates configuration from JSON files 2. **CommandValidator**: Checks if commands are allowed and safe to execute 3. **SessionManager**: Creates and manages command execution sessions 4. **PTYExecutor**: Handles interactive command execution using pseudoterminals 5. **BasicExecutor**: Handles simple non-interactive commands 6. **SecurityManager**: Implements security measures and restrictions 7. **Logger**: Records all activities and manages log files ### Config File Structure The config file contains: - Whitelist of allowed commands - Whitelist of allowed directories - Session settings (timeout, max count) - Security settings - Logging configuration ## Milestones and Deliverables 1. **Project Setup**: Complete project scaffolding and infrastructure ✅ 2. **MVP**: Basic command execution with security features ✅ 3. **Interactive Support**: Full pseudoterminal integration ✅ 4. **Production Ready**: Completed security features and testing ✅ 5. **Release**: Version 1.0 with documentation ✅ ## Security Considerations Security is a primary focus throughout the development. Key considerations include: - Command injection prevention - Directory traversal protection - Resource limitation (CPU, memory, time) - Input/output sanitization - Comprehensive logging for security audits ## Testing Strategy Testing includes: - Unit tests for individual components - Integration tests for the full system - Security tests specifically targeting potential vulnerabilities - Performance tests for resource usage The test coverage is excellent with over 85% statement coverage.