(Delphi ActiveX) 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.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
ftp: TChilkatFtp2;
certStore: TChilkatCertStore;
password: WideString;
success: Integer;
cert: IChilkatCert;

begin
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

ftp := TChilkatFtp2.Create(Self);

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 := 1;

// The Ssl property is for establishing an implicit SSL connection
// on port 990.  Because this example uses explicit SSL, it 
// should remain 0.
ftp.Ssl := 0;

// Load a certificate from a .pfx
// A PFX may contain several certs, including the certificates
// in a chain of authority.
certStore := TChilkatCertStore.Create(Self);

password := '***';
// Load the certs from a PFX into an in-memory certificate store:
success := certStore.LoadPfxFile('chilkat.pfx',password);
if (success <> 1) then
  begin
    Memo1.Lines.Add(certStore.LastErrorText);
    Exit;
  end;

// Find the exact cert we'll use:

cert := certStore.FindCertBySubject('Chilkat Software, Inc.');
if (certStore.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add('Certificate not found!');
    Exit;
  end;

// Use this certificate for our secure (SSL/TLS) connection:
success := 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 <> 1) then
  begin
    Memo1.Lines.Add(ftp.LastErrorText);
    Exit;
  end
else
  begin
    // LastErrorText contains information even when
    // successful. This allows you to visually verify
    // that the secure connection actually occurred.
    Memo1.Lines.Add(ftp.LastErrorText);
  end;

Memo1.Lines.Add('Secure FTP Channel Established!');

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

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

success := ftp.Disconnect();
end;