PHP Extension

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.

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<?php

include("chilkat.php");

$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.

$tunnel = new CkSshTunnel();

//  The tunnel forwards accepted local connections to this destination through the SSH server.
$tunnel->put_DestHostname('db.internal.example.com');
$tunnel->put_DestPort(5432);

//  Connect to the SSH server.  This performs the TCP/proxy connection and SSH handshake, but
//  does not authenticate yet.
$sshPort = 22;
$success = $tunnel->Connect('ssh.example.com',$sshPort);
if ($success == false) {
    print $tunnel->lastErrorText() . "\n";
    exit;
}

//  Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
$infoRequestXml = $tunnel->startKeyboardAuth('mySshLogin');
if ($tunnel->get_LastMethodSuccess() == false) {
    print $tunnel->lastErrorText() . "\n";
    exit;
}

print $infoRequestXml . "\n";

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

$waitForThreadExit = true;
$success = $tunnel->CloseTunnel($waitForThreadExit);
if ($success == false) {
    print $tunnel->lastErrorText() . "\n";
    exit;
}


?>