Dart

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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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // 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.

  final ssh = CkSsh();

  // Connect to the SSH server.  Port 22 is the usual SSH port.
  final sshPort = 22;
  try {
    ssh.connect('ssh.example.com', sshPort);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Begin keyboard-interactive authentication.  The returned XML describes the prompts.
  final String infoRequestXml;
  try {
    infoRequestXml = ssh.startKeyboardAuth('mySshLogin');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print(infoRequestXml);

  // Answer the prompt(s) with ContinueKeyboardAuth.

  ssh.disconnect();
}