phpseclib ssh2 enable tty - php

Question

my ssh script:
include('Net/SSH2.php');
set_include_path(getcwd());
$ssh_host = "myserver.com";
if($ssh_host != null){
$ssh_user = globals::$ssh_logins[$ssh_host];
$ssh = new Net_SSH2($ssh_host);
//$ssh->enablePTY();
if (!$ssh->login($ssh_user['username'], $ssh_user['password'])) {
echo $ssh->isConnected() ? 'bad username or password' : 'unable to establish connection';
}
echo $ssh->exec('sudo bash /myscript.sh');
}else{
echo "no host: " . $ssh_host;
}
when calling:
echo $ssh->exec('sudo bash /myscript.sh');
i get the output:
stdin: is not a tty
sudo: sorry, you must have a tty to run sudo
how do i enable tty on phpseclib?
Sudo is necessary also it is important to retrieve the output. my script returns multiple lines.
Centos 7
PHP 7
interesting link: https://unix.stackexchange.com/questions/136676/sudo-sorry-you-must-have-a-tty-to-run-sudo-when-using-sudo-in-a-remote-scrip?newreg=f31852b195804fd1b988aeb0a9ce59d9

Answer 1

You're on the right track with your $ssh->enablePTY() but once you do that you'll need to do $ssh->read(). Without a PTY $ssh->exec() will return the commands output. If you do $ssh->enablePTY() you'll need to do $ssh->read() to get output.
The reason for this is that with a PTY data can be sent to and from the shell whereas it can't without a PTY. Without a PTY the output you get is the output you get and no input can change that because you can't send input. With a PTY input can change the output.
Also relevant, phpseclib's docs talk about doing sudo with it. From http://phpseclib.sourceforge.net/ssh/examples.html#sudo :
<?php
include('Net/SSH2.php');
$ssh = new Net_SSH2('www.domain.tld');
if (!$ssh->login('username', 'password')) {
exit('Login Failed');
}
echo $ssh->read('username#username:~$');
$ssh->write("sudo ls -la\n");
$output = $ssh->read('#[pP]assword[^:]*:|username#username:~\$#', NET_SSH2_READ_REGEX);
echo $output;
if (preg_match('#[pP]assword[^:]*:#', $output)) {
$ssh->write("password\n");
echo $ssh->read('username#username:~$');
}
If your account doesn't have a password I guess it doesn't matter but if you do have a password then you'll need to do something like the above.