Delphi ActiveX

FTP over Implicit TLS (Ssl, AuthSsl, AutoFix)

Demonstrates the SSL/TLS connection-mode properties Ssl, AuthSsl, and AutoFix. Setting Ssl true selects implicit FTPS, in which TLS begins immediately after the TCP connection on port 990.

Background: FTP has two ways to add TLS: implicit (this example) starts encrypted from the first byte on a dedicated port, 990; explicit (via AuthTls) connects in the clear on port 21 and issues AUTH TLS to upgrade. Explicit is the modern standard; implicit persists mainly for legacy servers. AuthSsl is an obsolete AUTH SSL variant to avoid. AutoFix, on by default, infers the mode from the port — disable it when you set these properties explicitly so it does not override your choice.

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var
success: Integer;
ftp: TChilkatFtp2;

begin
success := 0;

ftp := TChilkatFtp2.Create(Self);

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

//  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';

//  Ssl = 1 selects IMPLICIT FTPS: TLS begins immediately after the TCP connection, before
//  the greeting.  Port 990 is conventional for implicit FTPS.  Ssl takes priority over AuthTls
//  and AuthSsl.
ftp.Ssl := 1;
ftp.Port := 990;

//  AuthSsl selects the legacy AUTH SSL command and is very uncommon -- use AuthTls (explicit
//  FTPS) for modern servers instead.  Left 0 here.
ftp.AuthSsl := 0;

//  AutoFix (default 1) automatically adjusts Ssl/AuthTls/AuthSsl based solely on the Port
//  (21 or 990).  Disable it when setting these properties explicitly, as here.
ftp.AutoFix := 0;

success := ftp.Connect();
if (success = 0) then
  begin
    Memo1.Lines.Add(ftp.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Connected using implicit FTPS.');

success := ftp.Disconnect();
if (success = 0) then
  begin
    Memo1.Lines.Add(ftp.LastErrorText);
    Exit;
  end;