(Perl) FTP Connect, Examine Server Certificate, and then Authenticate

Demonstrates how to connect to an FTP server, examine the server's SSL/TLS certificate, and then, if it meets the application's security requirements, proceed to authenticate.

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

# This example assumes Chilkat Ftp2 to have been previously unlocked.
# See Unlock Ftp2 for sample code.

$ftp = chilkat::CkFtp2->new();

$ftp->put_Hostname("www.authtls-ftps-server.com");
$ftp->put_Username("FTP_LOGIN");
$ftp->put_Password("FTP_PASSWORD");
$ftp->put_AuthTls(1);
$ftp->put_Port(21);

# Connect to the FTP server using explicit TLS (AUTH TLS).
$success = $ftp->ConnectOnly();
if ($success != 1) {
    print $ftp->lastErrorText() . "\r\n";
    exit;
}

# Get the FTP server's certificate.
# serverCert is a Cert
$serverCert = $ftp->GetSslServerCert();
if ($ftp->get_LastMethodSuccess() != 1) {
    print $ftp->lastErrorText() . "\r\n";
    exit;
}

# Now that we have the certificate, we can check it in any way we desire.
# (See the online reference documentation for the certificate object's methods
# and properties)...

# Assuming the certificate is OK, proceed to authenticate with the FTP server.
$success = $ftp->LoginAfterConnectOnly();
if ($success != 1) {
    print $ftp->lastErrorText() . "\r\n";
    exit;
}

# 
# Proceed with uploading/download files, etc...
# 

$ftp->Disconnect();
print "Success." . "\r\n";