PHP : ssh2 : How to connect to a second ssh server

Question

I have to connect to a server via ssh, but to access it I need to first connect to another ssh server. I use standard password access to them.

So my steps are:

ssh [email protected]

then when connected in serverdomain1 I do in terminal:

ssh [email protected]

in php, I tried to use ssh2_exec('ssh serverdomain2.com'); but no results. Then I tried also ss2_tunnel($connection, ...). but nothing worked.

This doesn't work:

$ssh = ssh2_connect('serverdomain1.com', 22);
if (ssh2_auth_password($ssh, $user,$pass)) {
    $stream = ssh_exec($ssh, "ssh serverdomain2.com");

    stream_set_blocking($stream, true);
    $stream_out = ssh2_fetch_stream($stream, SSH2_STREAM_STDIO);
    echo stream_get_contents($stream_out);    // <== doesn't work!!!
}

This also doesn't work:

$ssh = ssh2_connect('serverdomain1.com', 22);
if (ssh2_auth_password($ssh, $user,$pass)) {
    $tunnel = ssh2_tunnel($ssh, 'serverdomain2.com', 22);

    if (!$tunnel) { 
        echo('no tunnel<br/>');
    }
    else {
        fwrite($tunnel, "echo 1\n");
        while (!feof($tunnel)) {
            echo fgets($tunnel, 128);
        }
    }    
}

The echo result for tunnel: "SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.4 Protocol mismatch."

How can I do that with SSH2 from PHP?

Answer 1

I recently published a project that allows PHP to obtain and interact with a real Bash shell, through SSH if needed. Get it here: https://github.com/merlinthemagic/MTS

The project lets you keep bouncing from server to server using ssh.

After downloading you would simply use the following code:

//first you get a shell on the first server:
 $shellObj = \MTS\Factories::getDevices()->getRemoteHost('ip_address1')->setConnectionDetail('username1', 'password1')->getShell();

//then build on that first shell, the following way.
\MTS\Factories::getDevices()->getRemoteHost('ip_address2')->setConnectionDetail('username2', 'password2')->getShell($shellObj);


//any command executed on the shell will run only on the second host you connected to.
$return1  = $shellObj->exeCmd("hostname");
echo $return1;//hostname of the second host you connected to

//