PHP

Start SFTP Keyboard-Interactive Authentication

Demonstrates the Chilkat SFtp.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: rather than assuming a single password, the server sends one or more questions — a password, a one-time code, a security question — and the client answers each. This is how SFTP supports two-factor and other challenge-response schemes. The returned XML tells you exactly what to ask and whether to mask the input.

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<?php

use Chilkat2\SFtp;

// Demonstrates the SFtp.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.

$sftp = new SFtp();

// Step 1: Connect the SSH transport.  Port 22 is the usual port.
$port = 22;
try {
    $sftp->Connect('sftp.example.com', $port);

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

echo $infoRequestXml, "\n";

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

$sftp->Disconnect();