Run exec()/system() etc command using PHP & OpenBSD

I am trying to run a simple command say ls -l on OpenBSD shell (uname -r: 6.4) using php 5.6.

<?php

$output = shell_exec('ls -l');

echo "<pre>$output</pre>";

?>

There is no output of above code. Just pre tag upon inspecting elements So what is causing this issue? I tried using the same command using

1. System
2. Shell_exec
3. exec

No luck. What would be the cause of this ? Probably System/shell_exec not supported in OpenBSD's version of Php or something else.

Thanks in advance!

You haven't given enough information for a definitive answer, but my guess is that you run php through php-fpm, which is by default chrooted to /var/www. Since shell_exec and system first call /bin/sh and you most likely didn't copy it to var/www/bin/sh it can't find your shell. After that you'd also need to copy the binaries (in this case ls) to your chroot and possible library dependencies (not needed for files under /bin).

Hope this helps for illustrative purposes, but please don't use it in production.