Linux SSH ID Monitoring

You could put the whole thing around a try block and in the exception, you could output a datapoint that indicates failure to login.

@Stuart Weenig, thanks. Are you referring to something like below?

if (user && pass)
{
    // Both user and pass exist, try to auth and if we get an invalid login error, warn the user
    try
    {
        def jsch = new JSch()
        session = jsch.getSession(user, host, port)
        session.connect()
    }
        catch(Exception e) {
            System.out.println(e);
        } 
}

Something like that. It could be a standalone datasource that returns 0 if the session connects and returns 1 if it doesn't. You should probably add a finally block to make sure the session disconnects.

Pardon my ignorance, but I am fairly new to groovy. Can you please tell me if this looks ok?

import com.jcraft.jsch.JSch
import com.santaba.agent.util.Settings

host = hostProps.get("system.hostname")
user = hostProps.get("ssh.user")
pass = hostProps.get("ssh.pass")
port = hostProps.get("ssh.port")?.toInteger() ?: 22
//cert = hostProps.get("ssh.cert") ?: '~/.ssh/id_rsa'
timeout = 15000 // timeout in milliseconds
try {
        
        jsch = new JSch()
        session = jsch.getSession(user, host, port)
        session.setConfig("StrictHostKeyChecking", "no");
        String authMethod = Settings.getSetting(Settings.SSH_PREFEREDAUTHENTICATION, Settings.DEFAULT_SSH_PREFEREDAUTHENTICATION);
        session.setConfig("PreferredAuthentications", authMethod);
        if (user && pass)
          { session.connect() }
}        
    catch(Exception e) {
    System.out.println(e);
    }
    
    finally {
        session.disconnect()
    }
    

Yep, something like that. I'd have to run it to make sure it's workable, but that's the general strategy.