(PHP Extension) SSH Keyboard Authentication

Demonstrates how to implement keyboard authentication with an SSH server.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$ssh = new CkSsh();

// Set some timeouts, in milliseconds:
$ssh->put_ConnectTimeoutMs(5000);
$ssh->put_IdleTimeoutMs(15000);

// Connect to the SSH server.  
// The standard SSH port = 22
// The hostname may be a hostname or IP address.
$hostname = 'sftp.example.com';
$port = 22;
$success = $ssh->Connect($hostname,$port);
if ($success != true) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// Begin keyboard authentication..
$xmlResponse = $ssh->startKeyboardAuth('myLogin');
if ($ssh->get_LastMethodSuccess() != true) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

// If a user authentication banner was received, then your app
// may display it prior to prompting for the password.
print 'UserAuthBanner: ' . $ssh->userAuthBanner() . "\n";

$xml = new CkXml();

$success = $xml->LoadXml($xmlResponse);
// Assume LoadXml succeeds for the example..
if ($xml->HasChildWithTag('success') == true) {
    print 'No password required, already authenticated.' . "\n";
    exit;
}

if ($xml->HasChildWithTag('error') == true) {
    print 'Authentication already failed.' . "\n";
    exit;
}

// See the online reference documentation for Chilkat SSH.
// The XML returned by StartKeyboardAuth will contain an infoRequest
// with one or more prompts that your application may choose to display.

// Call ContinueKeyboardAuth, passing in the whatever information is requires (such as the password).
// Typically, keyboard authentication requires one call to ContinueKeyboardAuth 
// using the password.  Theoretically, the SSH server could prompt for additional pieces
// of information.  The authentication is completed when the XML returned contains
// either a "success" or "error" child node.

// This example asumes only one call to ContinueKeyboardAuth is required.
$xmlResponse = $ssh->continueKeyboardAuth('myPassword');
if ($ssh->get_LastMethodSuccess() != true) {
    print $ssh->lastErrorText() . "\n";
    exit;
}

$success = $xml->LoadXml($xmlResponse);
// Assume LoadXml succeeds for the example..
if ($xml->HasChildWithTag('success') == true) {
    print 'SSH Keyboard Authentication Successful!' . "\n";
    exit;
}

if ($xml->HasChildWithTag('error') == true) {
    print 'Authentication failed.' . "\n";
    exit;
}


?>