Secure FTP with Client Certificate

Chilkat FTP2 provides the ability to use a client certificate with secure FTP (implicit or explicit SSL/TLS). This example demonstrates how to load a certificate from a .pfx and use it as the client-side SSL cert. Note: Client-side certificates are only needed in situations where the server demands one.

Download: Chilkat .NET Assemblies

Chilkat.Ftp2 ftp = new Chilkat.Ftp2();

bool success;

//  Any string unlocks the component for the 1st 30-days.
success = ftp.UnlockComponent("Anything for 30-day trial");
if (success != true) {
    MessageBox.Show(ftp.LastErrorText);
    return;
}

ftp.Hostname = "ftp.***.com";
ftp.Port = 21;
ftp.Username = "test";
ftp.Password = "test";

//  This example will use explict TLS/SSL.
//  Establish an explicit secure channel after connection
//  on the standard FTP port 21.
ftp.AuthTls = true;

//  The Ssl property is for establishing an implicit SSL connection
//  on port 990.  Because this example uses explicit SSL, it
//  should remain false.
ftp.Ssl = false;

//  Load a certificate from a .pfx
//  A PFX may contain several certs, including the certificates
//  in a chain of authority.
Chilkat.CertStore certStore = new Chilkat.CertStore();
string password;
password = "***";
//  Load the certs from a PFX into an in-memory certificate store:
success = certStore.LoadPfxFile("chilkat.pfx",password);
if (success != true) {
    textBox1.Text += certStore.LastErrorText + "\r\n";
    return;
}

//  Find the exact cert we'll use:
Chilkat.Cert cert = null;
cert = certStore.FindCertBySubject("Chilkat Software, Inc.");
if (cert == null ) {
    textBox1.Text += "Certificate not found!" + "\r\n";
    return;
}

//  Use this certificate for our secure (SSL/TLS) connection:
ftp.SetSslClientCert(cert);

//  Connect and login to the FTP server.  The connection is
//  made secure because of the AuthTls setting.
success = ftp.Connect();
if (success != true) {
    MessageBox.Show(ftp.LastErrorText);
    return;
}
else {
    //  LastErrorText contains information even when
    //  successful. This allows you to visually verify
    //  that the secure connection actually occurred.
    textBox1.Text += ftp.LastErrorText + "\r\n";
}

MessageBox.Show("Secure FTP Channel Established!");

//  Do whatever you're doing to do ...
//  upload files, download files, etc...

//  .....
//  .....

ftp.Disconnect();