Alolite SSH Server

A Model Context Protocol (MCP) server that enables SSH remote command execution on remote machines with persistent connections. This server provides a secure way to connect to remote servers, execute commands, and retrieve output through the MCP protocol while maintaining long-lived SSH sessions for improved performance.

Features

• Persistent SSH connections - Maintains long-lived SSH sessions for better performance
• Automatic connection management - Reuses connections, automatically reconnects if lost
• Connection pooling - Manages multiple SSH connections efficiently
• Execute commands on remote servers via SSH
• Automatic SSH key discovery - Works like standard ssh command, automatically finds keys in ~/.ssh/
• Support for both SSH key and password authentication
• SSH agent forwarding support
• Configurable connection timeouts
• Detailed command execution results including stdout, stderr, and exit codes
• Connection monitoring - Track active connections, idle times, and connection status
• Graceful cleanup - Automatic cleanup of stale connections and graceful shutdown
• Error handling and reporting

Installation

From npm (Recommended)

npm install -g @alolite/ssh-mcp

From source

1. Clone the repository:

git clone <repository-url>
cd ssh-mcp

2. Install dependencies:

npm install

3. Build the project:

npm run build

Usage

The server exposes two main tools: ssh_execute and ssh_connections

ssh_execute

Execute a command on a remote server via SSH with persistent connections, just like using ssh -A username@hostname.

Key Benefits of Persistent Connections:

• First command to a server establishes the connection
• Subsequent commands reuse the existing connection (much faster)
• Connections are automatically maintained and monitored
• Automatic reconnection if connection is lost
• Connection cleanup after 30 minutes of inactivity

Parameters:

• host (string): SSH server hostname or IP address (e.g., 'dev234', '192.168.1.100')
• username (string): SSH username (e.g., 'username')
• command (string): Command to execute on the remote server
• port (number, optional): SSH server port (default: 22)
• privateKeyPath (string, optional): Path to SSH private key file (default: auto-discovered from ~/.ssh/)
• passphrase (string, optional): Passphrase for the private key (if required)
• password (string, optional): SSH password (only if not using SSH keys)
• timeout (number, optional): Connection timeout in milliseconds (default: 10000)
• agentForward (boolean, optional): Enable SSH agent forwarding (default: true)

ssh_connections

Manage and monitor SSH connections in the connection pool.

Parameters:

• action (string): Action to perform:
  • "list": List all active connections with status
  • "close": Close a specific connection
  • "close_all": Close all connections
• connectionKey (string, optional): Connection identifier (username@host:port) - required for "close" action

Usage Examples:

// List all active connections
{
  "action": "list"
}

// Close a specific connection
{
  "action": "close",
  "connectionKey": "username@host:22"
}

// Close all connections
{
  "action": "close_all"
}

Authentication Priority:

1. If password is provided, use password authentication
2. Otherwise, use SSH key authentication (default behavior):
   • If privateKeyPath is specified, use that key
   • If not specified, automatically discover keys from ~/.ssh/ directory
   • Tries common key names: id_rsa, id_ed25519, id_ecdsa, id_dsa

Simple Usage Examples for ssh_execute:

// Basic command execution (like: ssh username@host 'ls -la')
// First run establishes connection, subsequent runs reuse it
{
  "host": "host",
  "username": "username", 
  "command": "ls -la"
}

// Second command on same server (reuses connection - much faster!)
{
  "host": "host",
  "username": "username", 
  "command": "pwd"
}

// Check disk space on production server
{
  "host": "prod-web-01.company.com",
  "username": "deploy",
  "command": "df -h"
}

// Run a command with specific SSH key
{
  "host": "staging-db",
  "username": "dbadmin",
  "privateKeyPath": "/home/user/.ssh/staging_rsa",
  "command": "systemctl status postgresql"
}

Example Configuration for Claude Desktop

Add this to your VSCode configuration:

{
  "servers": {
    "alolite-ssh-mcp": {
      "command": "npx",
      "args": ["-y", "alolite-ssh-mcp", "@alolite/ssh-mcp"]
    }
  }
}

Security Considerations

• Credentials: This server requires SSH credentials to function. Be cautious about how credentials are provided and stored.
• Command Execution: The server can execute arbitrary commands on remote systems. Ensure proper access controls.
• Network Security: SSH connections are encrypted, but ensure you're connecting to trusted hosts.
• Logging: Sensitive information like passwords are not logged, but command output may contain sensitive data.

License

MIT