PHP

Set a TLS Client Certificate for IMAP

Demonstrates the Chilkat Imap.SetSslClientCert method, which supplies a client certificate for TLS client-certificate authentication. The only argument is a Cert object that must provide access to its private key. Call it before connecting. This example loads the certificate from a PFX file.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: Most IMAP servers authenticate with a username and password only. A few high-security deployments additionally require mutual TLS, where the client presents its own certificate during the handshake. Because that happens as part of connecting, the certificate must be set before Connect — setting it afterward has no effect on the already-established connection.

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<?php

use Chilkat2\Cert;
use Chilkat2\Imap;

// Demonstrates the Imap.SetSslClientCert method, which supplies a client certificate for TLS
// client-certificate authentication.  The only argument is a Cert object.  It must be called
// before connecting.

$imap = new Imap();

$imap->Ssl = true;
$imap->Port = 993;

// The PFX password is not hard-coded in source.  Insert code here to obtain it from an
// interactive prompt, environment variable, or a secrets vault.
$pfxPassword = '';

// Load the client certificate (and its private key) from a PFX file.
$cert = new Cert();
try {
    $cert->LoadPfxFile('qa_data/client.pfx', $pfxPassword);

    // Provide the client certificate BEFORE connecting.
    $imap->SetSslClientCert($cert);

    $imap->Connect('imap.example.com');

    $imap->Login('user@example.com', 'myPassword');

    $imap->Disconnect();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}