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PHP Extension Examples

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(PHP Extension) SSH Keyboard Authentication

Demonstrates how to implement keyboard authentication with an SSH server.

Chilkat PHP Downloads

PHP Extension for Windows, Linux, MAC OS X,
Alpine Linux, Solaris, OpenBSD, FreeBSD,
and Linux armhf/aarch64

<?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;
}


?>

 

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