Java

Open an SSH Tunnel

Demonstrates Socket.SshOpenTunnel, which connects to an SSH server and initializes an SSH tunneling session, then authenticates it.

Background. An SSH tunnel lets a socket reach a destination host through an SSH server using port forwarding. The sequence is: open the tunnel, authenticate, then open forwarded channels to destinations.

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Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Socket;

public class ChilkatExample {

    public static void main(String[] args) {
        Socket socket = new Socket();

        // Connect to the SSH server and initialize an SSH tunneling session.  Port 22 is conventional but
        // not required.
        try {
            socket.sshOpenTunnel("ssh.example.com", 22);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // After the tunnel is open, authenticate before opening forwarded channels.
        // The SSH password should come from a secure source rather than being hard-coded.
        String sshPassword = "mySshPassword";
        try {
            socket.sshAuthenticatePw("sshUser", sshPassword);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("SSH tunnel established and authenticated.");
    }
}