PHP

Start SSH Keyboard-Interactive Authentication

Demonstrates the Chilkat Ssh.StartKeyboardAuth method, which begins keyboard-interactive authentication. The only argument is the login name. It returns XML describing the server's prompts and whether each response should be echoed. Answer the prompts with ContinueKeyboardAuth.

Background: Keyboard-interactive is the flexible, prompt-driven SSH method — the server sends one or more questions (a password, a one-time code, a security question) and the client answers each. It is how SSH supports two-factor and other challenge-response schemes. The returned XML tells you exactly what to ask the user and whether to mask their input.

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<?php

use Chilkat2\Ssh;

// Demonstrates the Ssh.StartKeyboardAuth method, which begins keyboard-interactive
// authentication.  The only argument is the login name.  It returns XML describing the server's
// prompts and whether each response should be echoed.

$ssh = new Ssh();

// Connect to the SSH server.  Port 22 is the usual SSH port.
$sshPort = 22;
try {
    $ssh->Connect('ssh.example.com', $sshPort);

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

echo $infoRequestXml, "\n";

// Answer the prompt(s) with ContinueKeyboardAuth.

$ssh->Disconnect();