PHP ActiveX

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

$success = 0;

//  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 COM("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.
$sshPort = 22;
$success = $tunnel->Connect('ssh.example.com',$sshPort);
if ($success == 0) {
    print $tunnel->LastErrorText . "\n";
    exit;
}

//  Begin keyboard-interactive authentication to receive the server's prompt(s).
$infoRequestXml = $tunnel->startKeyboardAuth('mySshLogin');
if ($tunnel->LastMethodSuccess == 0) {
    print $tunnel->LastErrorText . "\n";
    exit;
}

//  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);
if ($tunnel->LastMethodSuccess == 0) {
    print $tunnel->LastErrorText . "\n";
    exit;
}

print $result . "\n";

$waitForThreadExit = 1;
$success = $tunnel->CloseTunnel($waitForThreadExit);
if ($success == 0) {
    print $tunnel->LastErrorText . "\n";
    exit;
}


?>