PHP

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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<?php

use Chilkat2\SshTunnel;

// 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.

$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 to receive the server's prompt(s).
    $infoRequestXml = $tunnel->StartKeyboardAuth('mySshLogin');

    // 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.
    $password = 'mySshPassword';

    // Submit the response (typically the password).  The returned XML indicates the next prompt or
    // the final result.
    $result = $tunnel->ContinueKeyboardAuth($password);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo $result, "\n";

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