(PHP Extension) Socket TLS Mutual Authentication (Client-Side Certificate)

This example demonstrates how to provide a client-side certificate, also known as "two-way authentication" or "mutual authentication" for servers that require a client certificate.

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.

$sock = new CkSocket();

// Set the certificate to be used for mutual TLS authentication
// (i.e. sets the client-side certificate for two-way TLS authentication)
$success = $sock->SetSslClientCertPfx('/home/bob/pfxFiles/myClientSideCertWithPrivateKey.pfx','pfxPassword');
if ($success != true) {
    print $sock->lastErrorText() . "\n";
    exit;
}

// Note: The certificate used for the client-side of TLS mutual authentication
// must have the associated private key available. (.pfx/.p12 files typically store both
// the certificate and associated private key.)

// Establish the connection using the socket object (with client certificate authentication).
$bTls = true;
$port = 443;
$maxWaitMs = 5000;
$success = $sock->Connect('www.example.com',$port,$bTls,$maxWaitMs);
if ($success != true) {
    print 'Connect Failure Error Code: ' . $sock->get_ConnectFailReason() . "\n";
    print $sock->lastErrorText() . "\n";
    exit;
}

// At this point, the Socket object is connected and authenticated using the client-side cert

// ...
// ..

?>