PHP

Set the FTP Password from a SecureString

Demonstrates the Chilkat Ftp2.SetSecurePassword method, which sets the login password from a SecureString. The only argument is the SecureString. It is equivalent to setting the Password property but avoids holding the password as an ordinary immutable string.

Background: An ordinary string password can linger in memory (and in memory dumps) because strings are immutable and copied freely. A SecureString keeps the value encrypted under a session key and clears it deterministically, reducing that exposure — a sensible upgrade for a credential the process holds for the life of the connection. Populate it from a runtime source rather than a hard-coded literal.

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<?php

use Chilkat2\Ftp2;
use Chilkat2\SecureString;

// Demonstrates the Ftp2.SetSecurePassword method, which sets the login password from a
// SecureString.  The only argument is the SecureString.  This avoids holding the password as an
// ordinary immutable string.

$ftp = new 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.
$password = 'myPassword';

// Place the password into a SecureString, which keeps it encrypted in memory.
$securePassword = new SecureString();
$securePassword->Append($password);

// Setting the secure password is equivalent to setting the Password property, but more
// protective.
try {
    $ftp->SetSecurePassword($securePassword);

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

echo "Connected using a secure password.\n";

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