jcraft.jsch problem

[peter kos]

Hi i try to ssh remote server and execute few commands however i noticed that i cannot execute root commands. I get password message on the console and everything hangs.

Any idea how i can do this ?

My code is

import com.jcraft.jsch.*;
import java.awt.*;
import javax.swing.*;
import java.io.*;
import org.springframework.beans.*;
import org.springframework.web.*;
import org.springframework.web.servlet.mvc.*;
import org.springframework.core.*;
import org.springframework.web.servlet.*;

public class HelloWorld{
	
  public static void main(String[] arg){
    
    try{
      JSch jsch=new JSch();

      String host=null;
      if(arg.length>0){
        host=arg[0];
      }
      else{
        /*host=JOptionPane.showInputDialog("Enter username@hostname",
                                         System.getProperty("user.name")+
                                         "@localhost"); */
      }

      Session session=jsch.getSession("username", "host", port);
      session.setPassword("password");
      session.setConfig("StrictHostKeyChecking", "no");
      // username and passphrase will be given via UserInfo interface.
      UserInfo ui=new MyUserInfo();
      session.setUserInfo(ui);
      session.connect();
      
      String command=JOptionPane.showInputDialog("Enter command", 
              "whoami;sudo -i;whoami;");
      
      Channel channel=session.openChannel("exec");
      ((ChannelExec)channel).setPty(true);
      ((ChannelExec)channel).setCommand(command);	

      InputStream in = channel.getInputStream();

      channel.connect(); 
      byte[] tmp=new byte[1024];
      while(true){
        while(in.available()>0){
          int i=in.read(tmp, 0, 1024);
          if(i<0)break;
          String message = new String(tmp, 0, i);
          System.out.print(message);
         if (message.contains("Password"))
        	// if the last prompt is "password 
        {
           can i do something like that and send password somehow here ??? tried to do out.write("password".getBytes()); but it doesn't work
        }
        }
        if(channel.isClosed()){
          System.out.println("exit-status: "+channel.getExitStatus());
          break;
        }
      }
      channel.disconnect();
    }
    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[] prompt,
                                              boolean[] echo){
/*
//System.out.println("promptKeyboardInteractive");
System.out.println("destination: "+destination);
System.out.println("name: "+name);
System.out.println("instruction: "+instruction);
System.out.println("prompt.length: "+prompt.length);
System.out.println("prompt: "+prompt[0]);
*/
      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
      }
    }
  }
}