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Full Discussion: Identify if ran by su or sudo?
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
Old 05-28-2010
Java 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
 

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LEARN ABOUT DEBIAN

viewsudo

VIEW-OS(1)						      General Commands Manual							VIEW-OS(1)

NAME

       viewsudo - execute a command as another (virtual) user

SYNOPSIS

       viewsudo [-g groupname|#gid] [-u username|#uid] command

DESCRIPTION

       viewsudo allows a user to execute a command as the superuser or
	      another user in View-OS.

OPTIONS

       viewsudo accepts the following command line options:

       -g group
	   Normally,  viewsudo	sets the primary group to root.  The -g option causes sudo to run the specified command with the primary group set
	   to group.  To specify a gid instead of a group name, use #gid.  When running commands as a gid, many shells require	that  the  '#'	be
	   escaped  with  a  backslash	('[u2019]).   If  no -u option is specified, the command will be run as the invoking user (not root).	In
	   either case, the primary group will be set to group.

       -u user
	   The -u option causes viewsudo to run the specified command as a user other than root.  To specify a uid instead of  a  user	name,  use
	   #uid.  When running commands as a uid, many shells require that the '#' be escaped with a backslash ('[u2019]).

RETURN VALUES

       Upon successful execution of a program, the exit status from viewsudo will simply be the exit status of the program that was executed.

SEE ALSO

       viewsu(1), sudo(1), linux.defs(5)

AUTHORS

       View-OS is a project of the Computer Science Department, University of Bologna. Project Leader: Renzo Davoli.
       <http://www.sourceforge.net/projects/view-os>

       Howto's and further information can be found on the project wiki <wiki.virtualsquare.org>.

NOTE

       Most part of the text is taken from sudo(1).

VIEW-OS: a process with a view					  August 8, 2009							VIEW-OS(1)
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