PHP ActiveX

FTP over Implicit TLS (Ssl, AuthSsl, AutoFix)

Demonstrates the SSL/TLS connection-mode properties Ssl, AuthSsl, and AutoFix. Setting Ssl true selects implicit FTPS, in which TLS begins immediately after the TCP connection on port 990.

Background: FTP has two ways to add TLS: implicit (this example) starts encrypted from the first byte on a dedicated port, 990; explicit (via AuthTls) connects in the clear on port 21 and issues AUTH TLS to upgrade. Explicit is the modern standard; implicit persists mainly for legacy servers. AuthSsl is an obsolete AUTH SSL variant to avoid. AutoFix, on by default, infers the mode from the port — disable it when you set these properties explicitly so it does not override your choice.

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<?php

$success = 0;

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

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

//  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';

//  Ssl = 1 selects IMPLICIT FTPS: TLS begins immediately after the TCP connection, before
//  the greeting.  Port 990 is conventional for implicit FTPS.  Ssl takes priority over AuthTls
//  and AuthSsl.
$ftp->Ssl = 1;
$ftp->Port = 990;

//  AuthSsl selects the legacy AUTH SSL command and is very uncommon -- use AuthTls (explicit
//  FTPS) for modern servers instead.  Left 0 here.
$ftp->AuthSsl = 0;

//  AutoFix (default 1) automatically adjusts Ssl/AuthTls/AuthSsl based solely on the Port
//  (21 or 990).  Disable it when setting these properties explicitly, as here.
$ftp->AutoFix = 0;

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

print 'Connected using implicit FTPS.' . "\n";

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


?>