Dev Tunnels SSH TCP Library

Includes SshClient and SshServer convenience classes for establishing SSH sessions over TCP, and the PortForwardingService class that enables forwarding TCP ports between client and server.

Examples

Forward from a server port to a client port

// Port-forwarding is not enabled by default. It must be added to the session configuration
// on both client and server sides.
const config = new SshSessionConfiguration();
config.addService(PortForwardingService);

const client = new SshClient(config);
const session: SshClientSession = await client.openSession(host, port);

// Handle server and client authentication.
session.onAuthenticating((e) => { ... });
if (!(await session.authenticate(credentials))) {
	throw new Error('Authentication failed.');
}

// Start port-forwarding.
const pfs = session.activateService(PortForwardingService);
const forwarder: RemotePortForwarder = await pfs.forwardFromRemotePort('::', remotePort);
// Connections to the port on the server will now be forwarded to
// the same port on the client.
forwarder.dispose();
// New connections to the server port are no longer forwarded.
// (Existing forwarded connections may remain alive until the session is closed.)

Stream to a server port

const session: SshClientSession = ...

const pfs = session.activateService(PortForwardingService);
const stream: SshStream = await pfs.streamToRemotePort('localhost', remotePort);
// The stream data is forwarded to/from the port on the server.

Browser compatibility

This package has limited capabilities when running in a browser. Obviously a browser cannot access local TCP ports. However, it is possible to stream to/from server ports. The streamFromRemotePort() and streamToRemotePort() methods are validated working in a browser environment.