JavaScript

Start SSH Tunnel Keyboard-Interactive Authentication

Demonstrates the Chilkat SshTunnel.StartKeyboardAuth method, which begins keyboard-interactive authentication. The only argument is the login name. It returns XML describing the server's prompts, which are answered with ContinueKeyboardAuth.

Background: Keyboard-interactive is the prompt-driven authentication method: the server sends one or more questions — a password, a one-time code, a security question — and the client answers each. This is how a tunnel supports two-factor and other challenge-response schemes. The returned XML says exactly what to ask and whether to mask the input.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

JavaScript

var success = false;

//  Demonstrates the SshTunnel.StartKeyboardAuth method, which begins keyboard-interactive
//  authentication.  The only argument is the login name.  It returns XML describing the server's
//  prompts, which are answered with ContinueKeyboardAuth.

var tunnel = new CkSshTunnel();

//  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.  The returned XML describes the server's prompts.
var infoRequestXml = tunnel.StartKeyboardAuth("mySshLogin");
if (tunnel.LastMethodSuccess == false) {
    console.log(tunnel.LastErrorText);
    return;
}

console.log(infoRequestXml);

//  Answer the prompt(s) with ContinueKeyboardAuth, then call BeginAccepting.

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