(Delphi DLL) 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 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, Cert;

...

procedure TForm1.Button1Click(Sender: TObject);
var
ftp: HCkFtp2;
success: Boolean;
serverCert: HCkCert;

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

ftp := CkFtp2_Create();

CkFtp2_putHostname(ftp,'www.authtls-ftps-server.com');
CkFtp2_putUsername(ftp,'FTP_LOGIN');
CkFtp2_putPassword(ftp,'FTP_PASSWORD');
CkFtp2_putAuthTls(ftp,True);
CkFtp2_putPort(ftp,21);

//  Connect to the FTP server using explicit TLS (AUTH TLS).
success := CkFtp2_ConnectOnly(ftp);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

//  Get the FTP server's certificate.
serverCert := CkFtp2_GetSslServerCert(ftp);
if (CkFtp2_getLastMethodSuccess(ftp) <> True) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

//  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 := CkFtp2_LoginAfterConnectOnly(ftp);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkFtp2__lastErrorText(ftp));
    Exit;
  end;

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

CkFtp2_Disconnect(ftp);
Memo1.Lines.Add('Success.');

CkFtp2_Dispose(ftp);

end;