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(Java) SSH Keyboard Authentication

Demonstrates how to implement keyboard authentication with an SSH server.

Chilkat Java Downloads

Java Libs for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkSsh ssh = new CkSsh();

    // Set some timeouts, in milliseconds:
    ssh.put_ConnectTimeoutMs(5000);
    ssh.put_IdleTimeoutMs(15000);

    // Connect to the SSH server.  
    // The standard SSH port = 22
    // The hostname may be a hostname or IP address.
    String hostname = "sftp.example.com";
    int port = 22;
    boolean success = ssh.Connect(hostname,port);
    if (success != true) {
        System.out.println(ssh.lastErrorText());
        return;
        }

    // Begin keyboard authentication..
    String xmlResponse = ssh.startKeyboardAuth("myLogin");
    if (ssh.get_LastMethodSuccess() != true) {
        System.out.println(ssh.lastErrorText());
        return;
        }

    // If a user authentication banner was received, then your app
    // may display it prior to prompting for the password.
    System.out.println("UserAuthBanner: " + ssh.userAuthBanner());

    CkXml xml = new CkXml();

    success = xml.LoadXml(xmlResponse);
    // Assume LoadXml succeeds for the example..
    if (xml.HasChildWithTag("success") == true) {
        System.out.println("No password required, already authenticated.");
        return;
        }

    if (xml.HasChildWithTag("error") == true) {
        System.out.println("Authentication already failed.");
        return;
        }

    // See the online reference documentation for Chilkat SSH.
    // The XML returned by StartKeyboardAuth will contain an infoRequest
    // with one or more prompts that your application may choose to display.

    // Call ContinueKeyboardAuth, passing in the whatever information is requires (such as the password).
    // Typically, keyboard authentication requires one call to ContinueKeyboardAuth 
    // using the password.  Theoretically, the SSH server could prompt for additional pieces
    // of information.  The authentication is completed when the XML returned contains
    // either a "success" or "error" child node.

    // This example asumes only one call to ContinueKeyboardAuth is required.
    xmlResponse = ssh.continueKeyboardAuth("myPassword");
    if (ssh.get_LastMethodSuccess() != true) {
        System.out.println(ssh.lastErrorText());
        return;
        }

    success = xml.LoadXml(xmlResponse);
    // Assume LoadXml succeeds for the example..
    if (xml.HasChildWithTag("success") == true) {
        System.out.println("SSH Keyboard Authentication Successful!");
        return;
        }

    if (xml.HasChildWithTag("error") == true) {
        System.out.println("Authentication failed.");
        return;
        }
  }
}

 

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