PHP ActiveX

Verify and Pin the FTPS Server Certificate

Demonstrates the certificate-verification properties RequireSslCertVerify, TlsPinSet, and the read-only SslServerCertVerified.

Background: By default a TLS connection is not rejected merely because certificate-chain verification fails, so RequireSslCertVerify = true is the important hardening step — it makes an expired, unsigned, or untrusted certificate abort the connection. TlsPinSet adds public-key pinning on top: the handshake fails unless the server's SPKI fingerprint matches one you configured, defending against a mis-issued certificate that would otherwise validate. Pinning supplements verification rather than replacing it. SslServerCertVerified reports the outcome.

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<?php

$success = 0;

$ftp = new COM("Chilkat.Ftp2");

$ftp->Hostname = 'ftp.example.com';
$ftp->Username = 'myFtpLogin';

$ftp->AuthTls = 1;

//  Normally you would not hard-code the password in source.  You should instead obtain it
//  from an interactive prompt, environment variable, or a secrets vault.
$ftp->Password = 'myPassword';

//  Reject the connection if the server certificate cannot be verified (expired, bad signature,
//  untrusted chain, etc.).  The default is 0, which does not reject on verification
//  failure -- set 1 for security.
$ftp->RequireSslCertVerify = 1;

//  Optionally pin the server's public key.  If none of the configured SPKI fingerprints matches,
//  the TLS handshake fails.  Pinning supplements normal verification; it does not replace it.
$ftp->TlsPinSet = 'sha256//YLh1dUR9y6Kja30RrAn7JKnbQG/uEtLMkBgFF2Fuihg=';

$success = $ftp->Connect();
if ($success == 0) {
    print $ftp->LastErrorText . "\n";
    exit;
}

//  SslServerCertVerified reports whether the certificate chain was successfully verified.
if ($ftp->SslServerCertVerified) {
    print 'The server certificate was verified.' . "\n";
}

$success = $ftp->Disconnect();
if ($success == 0) {
    print $ftp->LastErrorText . "\n";
    exit;
}


?>