Dev Tunnels SSH Library

A Secure Shell (SSH2) client and server protocol implementation for Node.js and browser environments.

Feature Highlights

• SSH over any JavaScript stream (including but not limited to Node.js TCP sockets and browser websockets)
• Configurable, extensible, negotiated algorithms for key-exchange, encryption, integrity (HMAC), and public-key authentication
• Channel multiplexing, with ability to stream data to/from channels
• Piping between two sessions can relay all channels and port-forwarding
• Extensible channel request handling (for "exec", "shell", or custom requests)
• Supports reconnecting a disconnected session without disrupting channel streams.
• Compatible with common SSH software. (Tested against OpenSSH.)

Limitations

The following features are not implemented in typescript implementation yet, and we have plans to implement the same:

• Async processing of messages and ability to send one message before receiving response for a previous one.

Requirements

The TypeScript implementation supports either Node.js (>= 14.x) or a browser environment. When running on Node.js, it uses the Node.js built-in crypto module. When running in a browser it uses the Web Crypto API, which is supported by all modern browsers. However note that since script on a web page cannot access native TCP sockets, the standard use of SSH over TCP is not possible; some other stream transport like a websocket may be used.

Packages

The optional dev-tunnels-ssh-tcp and dev-tunnels-ssh-keys depend on the core dev-tunnels-ssh package.