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

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Ftp2, CertStore, Cert;

...

procedure TForm1.Button1Click(Sender: TObject);
var
ftp: HCkFtp2;
certStore: HCkCertStore;
password: PWideChar;
success: Boolean;
cert: HCkCert;

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

ftp := CkFtp2_Create();

CkFtp2_putHostname(ftp,'ftp.***.com');
CkFtp2_putPort(ftp,21);
CkFtp2_putUsername(ftp,'test');
CkFtp2_putPassword(ftp,'test');

// This example will use explict TLS/SSL.
// Establish an explicit secure channel after connection
// on the standard FTP port 21.
CkFtp2_putAuthTls(ftp,True);

// The Ssl property is for establishing an implicit SSL connection
// on port 990.  Because this example uses explicit SSL, it 
// should remain False.
CkFtp2_putSsl(ftp,False);

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

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

// Find the exact cert we'll use:

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

// Use this certificate for our secure (SSL/TLS) connection:
success := CkFtp2_SetSslClientCert(ftp,cert);
CkCert_Dispose(cert);

// Connect and login to the FTP server.  The connection is 
// made secure because of the AuthTls setting.
success := CkFtp2_Connect(ftp);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    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(CkFtp2__lastErrorText(ftp));
  end;

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

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

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

success := CkFtp2_Disconnect(ftp);

CkFtp2_Dispose(ftp);
CkCertStore_Dispose(certStore);

end;