PHP Extension

Continue SFTP Keyboard-Interactive Authentication

Demonstrates the Chilkat SFtp.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, remember that InitializeSftp still must be called before any file operation.

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<?php

include("chilkat.php");

$success = false;

//  Demonstrates the SFtp.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.

$sftp = new CkSFtp();

//  Step 1: Connect the SSH transport.  Port 22 is the usual port.
$port = 22;
$success = $sftp->Connect('sftp.example.com',$port);
if ($success == false) {
    print $sftp->lastErrorText() . "\n";
    exit;
}

//  Begin keyboard-interactive authentication to receive the server's prompt(s).
$infoRequestXml = $sftp->startKeyboardAuth('mySshLogin');
if ($sftp->get_LastMethodSuccess() == false) {
    print $sftp->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 = $sftp->continueKeyboardAuth($password);
if ($sftp->get_LastMethodSuccess() == false) {
    print $sftp->lastErrorText() . "\n";
    exit;
}

print $result . "\n";

//  On success, initialize the SFTP subsystem.
$success = $sftp->InitializeSftp();
if ($success == false) {
    print $sftp->lastErrorText() . "\n";
    exit;
}

$sftp->Disconnect();

?>