Pascal (Lazarus/Delphi)

Start SSH Tunnel Keyboard-Interactive Authentication

Demonstrates the Chilkat SshTunnel.StartKeyboardAuth method, which begins keyboard-interactive authentication. The only argument is the login name. It returns XML describing the server's prompts, which are answered with ContinueKeyboardAuth.

Background: Keyboard-interactive is the prompt-driven authentication method: the server sends one or more questions — a password, a one-time code, a security question — and the client answers each. This is how a tunnel supports two-factor and other challenge-response schemes. The returned XML says exactly what to ask and whether to mask the input.

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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.SshTunnel;

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

procedure RunDemo;
var
  success: Boolean;
  tunnel: TSshTunnel;
  sshPort: Integer;
  infoRequestXml: string;
  waitForThreadExit: Boolean;

begin
  success := False;

  //  Demonstrates the SshTunnel.StartKeyboardAuth method, which begins keyboard-interactive
  //  authentication.  The only argument is the login name.  It returns XML describing the server's
  //  prompts, which are answered with ContinueKeyboardAuth.

  tunnel := TSshTunnel.Create;

  //  The tunnel forwards accepted local connections to this destination through the SSH server.
  tunnel.DestHostname := 'db.internal.example.com';
  tunnel.DestPort := 5432;

  //  Connect to the SSH server.  This performs the TCP/proxy connection and SSH handshake, but
  //  does not authenticate yet.
  sshPort := 22;
  success := tunnel.Connect('ssh.example.com',sshPort);
  if (success = False) then
    begin
      WriteLn(tunnel.LastErrorText);
      Exit;
    end;

  //  Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
  infoRequestXml := tunnel.StartKeyboardAuth('mySshLogin');
  if (tunnel.LastMethodSuccess = False) then
    begin
      WriteLn(tunnel.LastErrorText);
      Exit;
    end;
  WriteLn(infoRequestXml);

  //  Answer the prompt(s) with ContinueKeyboardAuth, then call BeginAccepting.

  waitForThreadExit := True;
  success := tunnel.CloseTunnel(waitForThreadExit);
  if (success = False) then
    begin
      WriteLn(tunnel.LastErrorText);
      Exit;
    end;


  tunnel.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.