I have an Ubuntu 18.04 server, and have been trying to create a php file that searches through auth.log for certain attributes and then displays them onscreen.
The php file has permission 644 and root:root as the owner:group. The auth.log file is default and stored in /var/log with permissions 640 and syslog:adm as owner:group.
The code in index.php is as follows:
$output = shell_exec("zgrep 'Invalid' /var/log/auth.log");
echo "<pre>$output</pre>";
echo exec('whoami'); //This returns as www-data
I've tried changing the owner:group on the php file to match the auth.log file but this doesn't seem to change anything. Any ideas on why this can't return the file details?