Delphi ActiveX

Start SFTP Keyboard-Interactive Authentication

Demonstrates the Chilkat SFtp.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: rather than assuming a single password, the server sends one or more questions — a password, a one-time code, a security question — and the client answers each. This is how SFTP supports two-factor and other challenge-response schemes. The returned XML tells you exactly what to ask and whether to mask the input.

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var
success: Integer;
sftp: TChilkatSFtp;
port: Integer;
infoRequestXml: WideString;

begin
success := 0;

//  Demonstrates the SFtp.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.

sftp := TChilkatSFtp.Create(Self);

//  Step 1: Connect the SSH transport.  Port 22 is the usual port.
port := 22;
success := sftp.Connect('sftp.example.com',port);
if (success = 0) then
  begin
    Memo1.Lines.Add(sftp.LastErrorText);
    Exit;
  end;

//  Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
infoRequestXml := sftp.StartKeyboardAuth('mySshLogin');
if (sftp.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(sftp.LastErrorText);
    Exit;
  end;
Memo1.Lines.Add(infoRequestXml);

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

sftp.Disconnect();