PHP Requires Chilkat v11.0.0+

Examine Client Certificates for an Accepted TLS Connection

See more Socket/SSL/TLS Examples

Demonstrates how to access the client certificates for a TLS connection accepted by your application acting as the server. Chilkat2 PHP

<?php

use Chilkat2\Cert;
use Chilkat2\Socket;

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

$listenSslSocket = new Socket();

// An SSL/TLS server needs a digital certificate.  This example loads it from a PFX file.
// This is the server's certificate.

$cert = new Cert();
try {
    $cert->LoadPfxFile('qa_data/serverCert/myServerCert.pfx', 'pfx_password');

    // To accept client client certificates in the TLS handshake,
    // we must indicate a list of acceptable client certificate root CA DN's
    // that are allowed.  (DN is an acronym for Distinguished Name.)
    // Call AddSslAcceptableClientCaDn once for each acceptable CA DN.
    // Here are a few examples so you can see the general format of a DN.
    $listenSslSocket->AddSslAcceptableClientCaDn('C=SE, O=AddTrust AB, OU=AddTrust External TTP Network, CN=AddTrust External CA Root');
    $listenSslSocket->AddSslAcceptableClientCaDn('O=Digital Signature Trust Co., CN=DST Root CA X3');

    // Initialize with our server's TLS certificate.
    $listenSslSocket->InitSslServer($cert);

    // Bind and listen on a port:
    $myPort = 8123;
    // Allow for a max of 5 queued connect requests.
    $backLog = 5;
    $listenSslSocket->BindAndListen($myPort, $backLog);

    // Accept the next incoming connection.
    $maxWaitMillisec = 20000;

    $clientSock = new Socket();
    $listenSslSocket->AcceptNext($maxWaitMillisec, $clientSock);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Examine the client certs chain.  The 1st cert will be the client certificate, and
// the subsequent certs will be the certs in the chain of authentication.
$numClientCerts = $clientSock->NumReceivedClientCerts;
echo 'numClientCerts = ', $numClientCerts, "\n";

$clientCert = new Cert();
$i = 0;
while ($i < $numClientCerts) {
    $clientSock->GetRcvdClientCert($i, $clientCert);
    echo $clientCert->SubjectDN, "\n";
    $i = $i + 1;
}

// Close the connection with the client
$clientSock->Close(1000);