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Run system command in perl cgi

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# 1  
Old 03-18-2009
Run system command in perl cgi
Hi guys,
got a problem with a perl cgi script over here. I need it to run a system command to get the status of a process. Unfortunately the process is owned by a specific user and only this user can get its status. So i tried running the command from the perl cgi with "su", but then i get the following logfile entry:
Quote:
su: must be run from a terminal
Anybody knows how to solve this problem? Another command? Another setting somewhere?
# 2  
Old 03-18-2009
Try using sudo if it is available on your system.
# 3  
Old 03-18-2009
Gave that a shot too, but the manpage of sudo says the following:
Quote:
If the invoking user is root or if the target user is the same as the invoking user, no password is required. Otherwise, sudo requires that users authenticate themselves with a password by default
So perl just grabs the output of sudo:
Quote:
[sudo] password for www-data:
Unfortunately www-data has no password, since it is not intended to be used as a system account. And apart from that, i don't even know how to submit this password to sudo...
# 4  
Old 03-18-2009
Check the sudoers manpage for the NOPASSWD tag
# 5  
Old 03-18-2009
Thanks for the hint. Sounded like the right way, tried it by adding
Quote:
www-data ALL=NOPASSWD: ALL
to /etc/sudoers. Still the same log entry...
# 6  
Old 03-18-2009
Ok, seems like now the problem shifted a bit. After trying sudo from within perl, the auth-logfile showed this line:
Quote:
Mar 18 21:41:58 Debian sudo: pam_unix(sudo:auth): authentication failure; logname= uid=0 euid=0 tty= ruser= rhost= user=www-data
So from root i su'ed to ww-data and tried entering the command directly from within the command line. Result is this in auth.log:
Quote:
Mar 18 21:43:01 Debian sudo: pam_unix(sudo:auth): conversation failed
Mar 18 21:43:01 Debian sudo: pam_unix(sudo:auth): auth could not identify password for [www-data]
Mar 18 21:43:01 Debian sudo: www-data : pam_authenticate: Kommunikationsfehler ; TTY=pts/0 ; PWD=/var/log ; USER=<my desired user> ; COMMAND=<my desired command>
"Kommunikationsfehler" would mean something like communication failure or conversation failure in english.

Now I don't know how to continue at all. I just don't know Linux quite this well. Anybody got me ideas?
# 7  
Old 03-19-2009
Can you interactively connect as www-data?
If yes, from the www-data login what prompt you get when you do "sudo su -"?
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