通过ssh运行sudo命令

Question

I'm trying to run command sudo -u [USER] [COMMAND] from java code on remote Linux machine and nothing happened. I use the ganymed-ssh2 jar . When I run the command without sudo its work perfect.

Also if I run sudo -u [USER] [COMMAND] from Linux machine it works perfect. How I can run this command from java?

Connection conn= SshConnection.GetConnection(hostname, username, password)

Session sess= conn.openSession(); 

sess.execCommand(command);

Answer 1

You need to get the secured stream and pass the password.

Channel channel = session.openChannel("exec");
((ChannelExec) channel).setCommand("sudo -S -p '' " + command);
channel.setInputStream(null);
OutputStream out = channel.getOutputStream();
((ChannelExec) channel).setErrStream(System.err);
InputStream in = channel.getInputStream();
((ChannelExec) channel).setPty(true);
channel.connect();
out.write((password + "\n").getBytes());
out.flush();;

Taken from here: http://codeflex.co/java-run-sudo-command-on-remote-linux-host/

Answer 2

You can only run this remotely if the sudoers configuration on the server allows this specific command executed by the given user in the name of the other user to run w/o asking for password (ie NOPASSWD option). Password entry for sudo can only be keyboard interactive which you cannot do remotely.