Delphi DLL

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: Boolean;
sftp: HCkSFtp;
port: Integer;
infoRequestXml: PWideChar;

begin
success := False;

//  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 := CkSFtp_Create();

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

//  Begin keyboard-interactive authentication.  The returned XML describes the server's prompts.
infoRequestXml := CkSFtp__startKeyboardAuth(sftp,'mySshLogin');
if (CkSFtp_getLastMethodSuccess(sftp) = False) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;
Memo1.Lines.Add(infoRequestXml);

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

CkSFtp_Disconnect(sftp);

CkSFtp_Dispose(sftp);