Pascal (Lazarus/Delphi)

FTP Connect, Examine Server Certificate, and then Authenticate

See more FTP Examples

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. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Ftp2,
  Chilkat.Cert;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  ftp: TFtp2;
  serverCert: TCert;

begin
  success := False;

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

  ftp := TFtp2.Create;

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

  //  Connect to the FTP server using explicit TLS (AUTH TLS).
  success := ftp.ConnectOnly();
  if (success = False) then
    begin
      WriteLn(ftp.LastErrorText);
      Exit;
    end;

  //  Get the FTP server's certificate.
  serverCert := TCert.Create;
  success := ftp.GetServerCert(serverCert);
  if (success = False) then
    begin
      WriteLn(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 = False) then
    begin
      WriteLn(ftp.LastErrorText);
      Exit;
    end;

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

  ftp.Disconnect();
  WriteLn('Success.');


  ftp.Free;
  serverCert.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.