Delphi DLL

Start SSH Keyboard-Interactive Authentication

Demonstrates the Chilkat Ssh.StartKeyboardAuth method, which begins keyboard-interactive authentication. The only argument is the login name. It returns XML describing the server's prompts and whether each response should be echoed. Answer the prompts with ContinueKeyboardAuth.

Background: Keyboard-interactive is the flexible, prompt-driven SSH method — the server sends one or more questions (a password, a one-time code, a security question) and the client answers each. It is how SSH supports two-factor and other challenge-response schemes. The returned XML tells you exactly what to ask the user and whether to mask their input.

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var
success: Boolean;
ssh: HCkSsh;
sshPort: Integer;
infoRequestXml: PWideChar;

begin
success := False;

//  Demonstrates the Ssh.StartKeyboardAuth method, which begins keyboard-interactive
//  authentication.  The only argument is the login name.  It returns XML describing the server's
//  prompts and whether each response should be echoed.

ssh := CkSsh_Create();

//  Connect to the SSH server.  Port 22 is the usual SSH port.
sshPort := 22;
success := CkSsh_Connect(ssh,'ssh.example.com',sshPort);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSsh__lastErrorText(ssh));
    Exit;
  end;

//  Begin keyboard-interactive authentication.  The returned XML describes the prompts.
infoRequestXml := CkSsh__startKeyboardAuth(ssh,'mySshLogin');
if (CkSsh_getLastMethodSuccess(ssh) = False) then
  begin
    Memo1.Lines.Add(CkSsh__lastErrorText(ssh));
    Exit;
  end;
Memo1.Lines.Add(infoRequestXml);

//  Answer the prompt(s) with ContinueKeyboardAuth.

CkSsh_Disconnect(ssh);

CkSsh_Dispose(ssh);