(Delphi ActiveX) 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 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;
success: Integer;
serverCert: IChilkatCert;

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

ftp := TChilkatFtp2.Create(Self);

ftp.Hostname := 'www.authtls-ftps-server.com';
ftp.Username := 'FTP_LOGIN';
ftp.Password := 'FTP_PASSWORD';
ftp.AuthTls := 1;
ftp.Port := 21;

// Connect to the FTP server using explicit TLS (AUTH TLS).
success := ftp.ConnectOnly();
if (success <> 1) then
  begin
    Memo1.Lines.Add(ftp.LastErrorText);
    Exit;
  end;

// Get the FTP server's certificate.
serverCert := ftp.GetSslServerCert();
if (ftp.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(ftp.LastErrorText);
    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 := ftp.LoginAfterConnectOnly();
if (success <> 1) then
  begin
    Memo1.Lines.Add(ftp.LastErrorText);
    Exit;
  end;

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

ftp.Disconnect();
Memo1.Lines.Add('Success.');
end;