how to do a linux reboot from php file -

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i have user brftv on linux system , have www-data runs nginx.

from terminal can let brftv user run 

sudo /sbin/reboot

and works fine since added following /etc/sudoers file's "#user privilege specification" section:

brftv all=nopasswd: /sbin/halt, /sbin/reboot, /sbin/poweroff www-data all=nopasswd: /sbin/halt, /sbin/reboot, /sbin/poweroff

but when php file runs following code, nothing happens

exec('nohup sudo -u brftv /sbin/reboot');

i added www-data line etc/sudoers above in case necessary when running above exec() (even though run -u brftv, i'm no linux expert, thought better safe in case).

the php file runs exec() owned www-data, , chmod 777, should have privilege execute it.

i have tried running php-file both through browser (would run user www-data assume) , terminal $ php myfile.php.

------------------- update -----------------

i did this

sudo chmod u s /sbin/reboot

which allows users on system run reboot cmd without password. works, rather not leave open, other solution /etc/sudoers better, if have hint @ problem is...

i followed tut http://linux.byexamples.com/archives/315/how-to-shutdown-and-reboot-without-sudo-password/ , second example pretty got above didn't work me..

i use small c program grant access php group (probably www-data in case?), use suid bit on executable, , exec reboot command

phpreboot.c :

#include <stdlib.h> #include <sys/types.h> #include <unistd.h>  int main() {    setuid(0); // uid 0, root    char *command = "/sbin/reboot";    execl(command, command, null);    return 0; // avoid warning (since never returns) }

compile it

gcc -wall phpreboot.c -o phpreboot

move phpreboot want run (has accessible php!)

mv phpreboot /home/private/

as root (or via sudo) ensure owner root , group set www-data, , change rights have suid bit (in order)

chown root:www-data phpreboot chmod 4750 phpreboot

the result, ls -l phpreboot should (note s in rws)

-rwsr-x--- 1 root www-data 8565 jun 12 11:42 phpreboot*

change php script execute phpreboot instead

exec ("/home/private/phpreboot"); // change path!

only 1 tiny executable have suid run reboot program, , php group able execute (and root of course).


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