Hi, problems using sshj

[Catalin Bararu]

Hi, i am trying to connect a ssh server using sshj and execute a command (the exec example). I don't know if i got it wrong or if it is something else

The code is the following :

Introd public static void main (String[] args) throws IOException {

SSHClient ssh = new SSHClient();

ssh.loadKnownHosts();

ssh.connect("192.168.89.129", 22);

try {

ssh.authPublickey(System.getProperty("administrator"));

Session session = ssh.startSession();

try {

Command cmd = session.exec("ping -c 1 google.com");

System.out.println(IOUtils.readFully(cmd.getInputStream()).toString());

cmd.join(5, TimeUnit.SECONDS);

System.out.println("\n** exit status: " + cmd.getExitStatus());

} finally {

session.close();

}

} finally {

ssh.disconnect();

ssh.close();

}

}uceţi aici codul...

The error i receive is the following :

Introduceţi aici codul...[main] INFO net.schmizz.sshj.common.SecurityUtils - BouncyCastle already registered as a JCE provider

Exception in thread "main" java.io.IOException: Could not load known_hosts

at net.schmizz.sshj.SSHClient.loadKnownHosts(SSHClient.java:565)

at ssh.ClientSSH.main(ClientSSH.java:14)

[Catalin Bararu]

Hello again, so i tried without loading known host but it disconnects with the following error.

[HOST_KEY_NOT_VERIFIABLE] Could not verify `ecdsa-sha2-nistp256` host key with fingerprint

 I can't figure it how to verify the keys.

Any help ?

[Eder F. Freitas]

How did you solved this? I've the same problem.

[Jeroen van Erp]

Can you check the github issue tracker and open a ticket there describing your setup, what you tried and what you're getting? 

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[Eder F. Freitas]

I identified the problem, in my case the target host didn't exist on known_hosts from my source machine, I had first to do a logon on target machine to my ssh connection works. Is there a way to update known_hosts without conect first at target machine?

I know that there is a similar way  like this https://serverfault.com/a/316100/268311. Does SSHJ it automatically?

Em terça-feira, 16 de janeiro de 2018 14:07:57 UTC-2, Jeroen van Erp escreveu:

Can you check the github issue tracker and open a ticket there describing your setup, what you tried and what you're getting? 

2018-01-16 16:52 GMT+01:00 Eder F. Freitas <jederf...@gmail.com>:

How did you solved this? I've the same problem.

Em terça-feira, 28 de abril de 2015 17:35:56 UTC-3, Catalin Bararu escreveu:

Hello again, so i tried without loading known host but it disconnects with the following error.

[HOST_KEY_NOT_VERIFIABLE] Could not verify `ecdsa-sha2-nistp256` host key with fingerprint

 I can't figure it how to verify the keys.

Any help ?

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[Krishnan Mahadevan]

Maybe you can try out something like this:

 

public static void main(String[] args) throws IOException {
    final SSHClient client = new SSHClient();
    client.addHostKeyVerifier(new PromiscuousVerifier()); //Adds a fake host verifier that treats every host as a known one (i.e., its part of the ~/.ssh/known_hosts file )
    client.connect("hostname");
    try {
        client.authPassword("username", "password");
        final Session session = client.startSession();
        try {
            final Session.Command cmd = session.exec("true");
            cmd.join(1, TimeUnit.SECONDS);
        } finally {
            session.close();
        }
    } finally {
        client.disconnect();
    }
}

 

 

Thanks & Regards

Krishnan Mahadevan

 

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