Java

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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Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.SFtp;

public class ChilkatExample {

    public static void main(String[] args) {
        // 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 sftp = new SFtp();

        // Step 1: Connect the SSH transport.  Port 22 is the usual port.
        int port = 22;
        String infoRequestXml;
        try {
            sftp.connect("sftp.example.com", port);

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

        System.out.println(infoRequestXml);

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

        sftp.disconnect();
    }
}