UserAuthKI.java

/* -*-mode:java; c-basic-offset:2; -*- */
import com.jcraft.jsch.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class UserAuthKI{
  public static void main(String[] arg){

    try{
      JSch jsch=new JSch();

      String host=JOptionPane.showInputDialog("Enter username@hostname",
					      System.getProperty("user.name")+
					      "@localhost"); 
      String user=host.substring(0, host.indexOf('@'));
      host=host.substring(host.indexOf('@')+1);

      Session session=jsch.getSession(user, host, 22);

      // username and passphrase will be given via UserInfo interface.
      UserInfo ui=new MyUserInfo();
      session.setUserInfo(ui);
      session.connect();

      Channel channel=session.openChannel("shell");

      channel.setInputStream(System.in);
      channel.setOutputStream(System.out);

      channel.connect();
    }
    catch(Exception e){
      System.out.println(e);
    }
  }


  public static class MyUserInfo implements UserInfo, UIKeyboardInteractive{
    public String getPassword(){ return passwd; }
    public boolean promptYesNo(String str){
      Object[] options={ "yes", "no" };
      int foo=JOptionPane.showOptionDialog(null, 
             str,
             "Warning", 
             JOptionPane.DEFAULT_OPTION, 
             JOptionPane.WARNING_MESSAGE,
             null, options, options[0]);
       return foo==0;
    }

    String passwd;
    JTextField passwordField=(JTextField)new JPasswordField(20);
  
    public String getPassphrase(){ return null; }
    public boolean promptPassphrase(String message){ return false; }
    public boolean promptPassword(String message){
      Object[] ob={passwordField}; 
      int result=
	  JOptionPane.showConfirmDialog(null, ob, message,
					JOptionPane.OK_CANCEL_OPTION);
      if(result==JOptionPane.OK_OPTION){
	passwd=passwordField.getText();
	return true;
      }
      else{ return false; }
    }
    public void showMessage(String message){
      JOptionPane.showMessageDialog(null, message);
    }

    final GridBagConstraints gbc = 
	new GridBagConstraints(0,0,1,1,1,1,
			       GridBagConstraints.NORTHWEST,
			       GridBagConstraints.NONE,
			       new Insets(0,0,0,0),0,0);
    private Container panel;
    public String[] promptKeyboardInteractive(String destination,
					      String name,
					      String instruction,
					      String lang,
					      String[] prompt,
					      boolean[] echo){
      panel = new JPanel();
      panel.setLayout(new GridBagLayout());

      gbc.weightx = 1.0;
      gbc.gridwidth = GridBagConstraints.REMAINDER;
      gbc.gridx = 0;
      panel.add(new JLabel(instruction), gbc);
      gbc.gridy++;

      gbc.gridwidth = GridBagConstraints.RELATIVE;

      JTextField[] texts=new JTextField[prompt.length];
      for(int i=0; i<prompt.length; i++){
	gbc.fill = GridBagConstraints.NONE;
	gbc.gridx = 0;
	gbc.weightx = 1;
	panel.add(new JLabel(prompt[i]),gbc);

	gbc.gridx = 1;
	gbc.fill = GridBagConstraints.HORIZONTAL;
	gbc.weighty = 1;
	if(echo[i]){
	  texts[i]=new JTextField(20);
	}
	else{
	  texts[i]=new JPasswordField(20);
	}
	panel.add(texts[i], gbc);
	gbc.gridy++;
      }

      if(JOptionPane.showConfirmDialog(null, panel, 
				       destination+": "+name,
				       JOptionPane.OK_CANCEL_OPTION,
				       JOptionPane.QUESTION_MESSAGE)
	 ==JOptionPane.OK_OPTION){
	String[] response=new String[prompt.length];
	for(int i=0; i<prompt.length; i++){
	  response[i]=texts[i].getText();
	}
	return response;
      }
      else{
	return null;  // cancel
      }
    }
  }
}