Java

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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import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Ssh;

public class ChilkatExample {

    public static void main(String[] args) {
        // 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 ssh = new Ssh();

        // Connect to the SSH server.  Port 22 is the usual SSH port.
        int sshPort = 22;
        String infoRequestXml;
        try {
            ssh.connect("ssh.example.com", sshPort);

            // Begin keyboard-interactive authentication.  The returned XML describes the prompts.
            infoRequestXml = ssh.startKeyboardAuth("mySshLogin");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println(infoRequestXml);

        // Answer the prompt(s) with ContinueKeyboardAuth.

        ssh.disconnect();
    }
}