PHP

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

use Chilkat2\SshTunnel;

// 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 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.
$sshPort = 22;
try {
    $tunnel->Connect('ssh.example.com', $sshPort);

    // Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
    $infoRequestXml = $tunnel->StartKeyboardAuth('mySshLogin');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo $infoRequestXml, "\n";

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

$waitForThreadExit = true;
try {
    $tunnel->CloseTunnel($waitForThreadExit);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}