Using JAVA intercepting Jsch prompt for entering password in UNIX shell

Question

I am trying to run shell command using jsch using java program. Command needs sudo access to get executed. Following is my code sample.

   String command1="sudo  restart oraserv";  
    java.util.Properties config = new java.util.Properties(); 
    config.put("StrictHostKeyChecking", "no");
    JSch jsch = new JSch();
    Session session;
    try {
        session = jsch.getSession(user, host, 22);
         session.setPassword(password);
            session.setConfig(config);
            session.connect();
            System.out.println("Connected");                
            Channel channel=session.openChannel("exec");                
            ((ChannelExec) channel).setCommand(command1);               
            channel.setInputStream(null);               
            ((ChannelExec)channel).setErrStream(System.err);                 
            InputStream in=channel.getInputStream();
            ((ChannelExec)channel).setPty(true);
            channel.connect();
            byte[] tmp=new byte[1024];
            while(true){
              while(in.available()>0){
                int i=in.read(tmp, 0, 1024);
                if(i<0)break;
                System.out.print(new String(tmp, 0, i));
              }
              if(channel.isClosed()){
                System.out.println("exit-status: "+channel.getExitStatus());
                break;
              }
              try{Thread.sleep(1000);}catch(Exception ee){}
            }
            channel.disconnect();
            session.disconnect();
            System.out.println("DONE");
    } catch (JSchException | IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

Now when i run it it stuck at following

Connected
[sudo] password for users:

After this nothing happens i want to make it run without prompting for password. Is there any way i can supply it password for execution to get successful.

Cosu · Accepted Answer · 2015-11-19 09:33:03Z

6

The JSCH website gives you an example on this very issue. The idea is to write the password to the OutputStream which represents the "write" end of the ssh connection. The relevant code block:

((ChannelExec)channel).setCommand("sudo -S -p '' "+command);


InputStream in=channel.getInputStream();
OutputStream out=channel.getOutputStream();
((ChannelExec)channel).setErrStream(System.err);

channel.connect();

out.write((sudo_pass+"\n").getBytes());
out.flush();

answered Nov 19, 2015 at 9:33

Cosu

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