Identify if ran by su or sudo? Post: 302425574

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Top Forums Shell Programming and Scripting Identify if ran by su or sudo? Post 302425574 by ericdp63 on Friday 28th of May 2010 01:27:07 PM

05-28-2010

Registered User

Identify if ran by su or sudo?

Recently I was on an operational call and heard the people running my code placing the code in the /tmp directory and running as root. I had not planned on that. So I want to add some checks to my code (using ksh93):

Code:

# ---------- ---------- ----------
# root not allowed to run this
# ---------- ---------- ----------
[[ $( whoami ) = root ]] && exit 2

# ---------- ---------- ----------
# Don't run this in /tmp
# ---------- ---------- ----------
[[ $( pwd ) = /tmp* ]] && exit 3

# ---------- ---------- ----------
# Don't run as sudo
# ---------- ---------- ----------


# ---------- ---------- ----------
# How much space is available here?
#
# Filesystem    Type   1K-blocks      Used Available Use% Mounted on
# /dev/sda3     ext3    68588072  32259392  32788356  50% /home
# ---------- ---------- ----------
integer _avail=$( df -k . | grep -v "^Filesystem" | awk '{ print $4 }' )
integer _threshold=26214400  # 25GB
(( _avail < _threshold )) && {

    print -u2 "***> There is not enough space (25gb) on this mount point!"
    print -u2 "     Only found ${_avail} kb."
    exit 4

}

What I can't find is a means to check the case where my code was run with sudo or "su -". The above 'whomai' returns the users name, not the fact it was run with root access through sudo. There are many reasons to use sudo, but in this case I want my app to run as a normal user with normal permissions, no extra help.

Is this possible? any ideas? I've done some google searching and all the references I can find are on how to use sudo, not how to identify it is being used.

Thanks for any help.
Eric

ericdp63

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LEARN ABOUT DEBIAN

pidof

PIDOF(8)						Linux System Administrator's Manual						  PIDOF(8)

NAME

       pidof -- find the process ID of a running program.

SYNOPSIS

       pidof [-s] [-c] [-n] [-x] [-o omitpid[,omitpid..]]  [-o omitpid[,omitpid..]..]  program [program..]

DESCRIPTION

       Pidof  finds  the  process  id's (pids) of the named programs. It prints those id's on the standard output. This program is on some systems
       used in run-level change scripts, especially when the system has a System-V like rc structure. In that case these scripts  are  located	in
       /etc/rc?.d, where ? is the runlevel. If the system has a start-stop-daemon (8) program that should be used instead.

OPTIONS

       -s     Single shot - this instructs the program to only return one pid.

       -c     Only  return  process ids that are running with the same root directory.	This option is ignored for non-root users, as they will be
	      unable to check the current root directory of processes they do not own.

       -n     Avoid stat(2) system function call on all binaries which are located on network based file systems like NFS.  Instead of using  this
	      option the the variable PIDOF_NETFS may be set and exported.

       -x     Scripts too - this causes the program to also return process id's of shells running the named scripts.

       -o omitpid
	      Tells  pidof  to omit processes with that process id. The special pid %PPID can be used to name the parent process of the pidof pro-
	      gram, in other words the calling shell or shell script.

EXIT STATUS

       0      At least one program was found with the requested name.

       1      No program was found with the requested name.

NOTES

       pidof is actually the same program as killall5; the program behaves according to the name under which it is called.

       When pidof is invoked with a full pathname to the program it should find the pid of, it is reasonably safe. Otherwise it is  possible  that
       it  returns  pids  of  running programs that happen to have the same name as the program you're after but are actually other programs. Note
       that that the executable name of running processes is calculated with readlink(2), so symbolic links to executables will also match.

SEE ALSO

       shutdown(8), init(8), halt(8), reboot(8), killall5(8)

AUTHOR

       Miquel van Smoorenburg, miquels@cistron.nl

								    01 Sep 1998 							  PIDOF(8)

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