Node.js

Continue SSH Tunnel Keyboard-Interactive Authentication

Demonstrates the Chilkat SshTunnel.ContinueKeyboardAuth method, which submits a response to a keyboard-interactive prompt. The only argument is the response text; for a request with multiple prompts, an XML response is supplied instead. It returns XML indicating the next prompt or the final result.

Background: This is the second half of the exchange started by StartKeyboardAuth. A server may issue several rounds of prompts, so a robust client loops: submit answers, read the returned XML, and continue until it sees success or failure. On success, BeginAccepting still must be called before the tunnel forwards traffic.

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NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    //  Demonstrates the SshTunnel.ContinueKeyboardAuth method, which submits a response to a
    //  keyboard-interactive prompt.  The only argument is the response.  For multiple prompts, an XML
    //  response is supplied instead.

    var tunnel = new chilkat.SshTunnel();

    //  The tunnel forwards accepted local connections to this destination through the SSH server.
    tunnel.DestHostname = "db.internal.example.com";
    tunnel.DestPort = 5432;

    //  Connect to the SSH server.  This performs the TCP/proxy connection and SSH handshake, but
    //  does not authenticate yet.
    var sshPort = 22;
    success = tunnel.Connect("ssh.example.com",sshPort);
    if (success == false) {
        console.log(tunnel.LastErrorText);
        return;
    }

    //  Begin keyboard-interactive authentication to receive the server's prompt(s).
    var infoRequestXml = tunnel.StartKeyboardAuth("mySshLogin");
    if (tunnel.LastMethodSuccess == false) {
        console.log(tunnel.LastErrorText);
        return;
    }

    //  Normally you would not hard-code the password in source.  You should instead obtain it
    //  from an interactive prompt, environment variable, or a secrets vault.
    var password = "mySshPassword";

    //  Submit the response (typically the password).  The returned XML indicates the next prompt or
    //  the final result.
    var result = tunnel.ContinueKeyboardAuth(password);
    if (tunnel.LastMethodSuccess == false) {
        console.log(tunnel.LastErrorText);
        return;
    }

    console.log(result);

    var waitForThreadExit = true;
    success = tunnel.CloseTunnel(waitForThreadExit);
    if (success == false) {
        console.log(tunnel.LastErrorText);
        return;
    }


}

chilkatExample();