Lazarus Pascal

Set the FTP TLS Version and Ciphers

Demonstrates the TLS negotiation properties SslProtocol and SslAllowedCiphers, and reads back the negotiated TlsVersion and TlsCipherSuite after connecting.

Background: SslProtocol sets the allowed (or minimum) TLS version — default lets Chilkat negotiate the best available, while a value like TLS 1.2 or higher enforces a floor for policy compliance. SslAllowedCiphers narrows the offered cipher suites, which most applications should leave at the secure defaults. The read-only TlsVersion and TlsCipherSuite report what was actually agreed, useful for logging and audits.

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Lazarus Pascal

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;

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

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

begin
  success := False;

  ftp := TFtp2.Create;

  ftp.Hostname := 'ftp.example.com';
  ftp.Username := 'myFtpLogin';

  ftp.AuthTls := True;

  //  Normally you would not hard-code the password in source.  You should instead obtain it
  //  from an interactive prompt, environment variable, or a secrets vault.
  ftp.Password := 'myPassword';

  //  Require at least TLS 1.2.  Accepted values include "default", "TLS 1.3", "TLS 1.2",
  //  "TLS 1.2 or higher", and so on.  "default" lets Chilkat negotiate the best available.
  ftp.SslProtocol := 'TLS 1.2 or higher';

  //  Optionally restrict the cipher suites offered.  Leave empty to use Chilkat's secure defaults.
  ftp.SslAllowedCiphers := 'TLS_AES_256_GCM_SHA384,TLS_CHACHA20_POLY1305_SHA256';

  success := ftp.Connect();
  if (success = False) then
    begin
      WriteLn(ftp.LastErrorText);
      Exit;
    end;

  //  After connecting, read back what was actually negotiated.
  WriteLn('Negotiated TLS version: ' + ftp.TlsVersion);
  WriteLn('Negotiated cipher suite: ' + ftp.TlsCipherSuite);

  success := ftp.Disconnect();
  if (success = False) then
    begin
      WriteLn(ftp.LastErrorText);
      Exit;
    end;


  ftp.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.