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/**
* This program will demonstrate SSH through jump hosts. Suppose that you don't have direct accesses
* to host2 and host3. java JumpHosts usr1@host1 usr2@host2 usr3@host3. You will be asked passwords
* for those destinations. If everything works fine, you will get file lists of your home-directory
* at host3.
*/
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.UIKeyboardInteractive;
import com.jcraft.jsch.UserInfo;
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class JumpHosts {
public static void main(String[] arg) {
try {
JSch jsch = new JSch();
if (arg.length <= 1) {
System.out.println("This program expects more arguments.");
System.exit(-1);
}
Session session = null;
Session[] sessions = new Session[arg.length];
String host = arg[0];
String user = host.substring(0, host.indexOf('@'));
host = host.substring(host.indexOf('@') + 1);
sessions[0] = session = jsch.getSession(user, host, 22);
session.setUserInfo(new MyUserInfo());
session.connect();
System.out.println("The session has been established to " + user + "@" + host);
for (int i = 1; i < arg.length; i++) {
host = arg[i];
user = host.substring(0, host.indexOf('@'));
host = host.substring(host.indexOf('@') + 1);
int assinged_port = session.setPortForwardingL(0, host, 22);
System.out
.println("portforwarding: " + "localhost:" + assinged_port + " -> " + host + ":" + 22);
sessions[i] = session = jsch.getSession(user, "127.0.0.1", assinged_port);
session.setUserInfo(new MyUserInfo());
session.setHostKeyAlias(host);
session.connect();
System.out.println("The session has been established to " + user + "@" + host);
}
ChannelSftp sftp = (ChannelSftp) session.openChannel("sftp");
sftp.connect();
sftp.ls(".", new ChannelSftp.LsEntrySelector() {
@Override
public int select(ChannelSftp.LsEntry le) {
System.out.println(le);
return ChannelSftp.LsEntrySelector.CONTINUE;
}
});
sftp.disconnect();
for (int i = sessions.length - 1; i >= 0; i--) {
sessions[i].disconnect();
}
} catch (Exception e) {
System.out.println(e);
}
}
public static class MyUserInfo implements UserInfo, UIKeyboardInteractive {
@Override
public String getPassword() {
return passwd;
}
@Override
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 = new JPasswordField(20);
@Override
public String getPassphrase() {
return null;
}
@Override
public boolean promptPassphrase(String message) {
return true;
}
@Override
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;
}
}
@Override
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;
@Override
public String[] promptKeyboardInteractive(String destination, String name, String instruction,
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
}
}
}
}
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