LinuxQuestions.org
Support LQ: Use code LQ3 and save $3 on Domain Registration
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Newbie
User Name
Password
Linux - Newbie This Linux forum is for members that are new to Linux.
Just starting out and have a question? If it is not in the man pages or the how-to's this is the place!

Notices


Reply
  Search this Thread
Old 04-30-2004, 09:34 AM   #1
ssudhi
LQ Newbie
 
Registered: Apr 2004
Posts: 6

Rep: Reputation: 0
Script to add users


I want to write a script that would create users for me. This script would take the username and password as arguments.

The problem is that I need to switch to the root to execute this. I want to programatically acheive this. If I use "su" in the script, it prompts for the password. I want to avoid that.

Any user should be able to run this script and add users. Switching to root should be handled by the script.

Can somebody help?

Thanks

ssudhi
 
Old 04-30-2004, 10:57 AM   #2
kilgoretrout
Senior Member
 
Registered: Oct 2003
Posts: 2,495

Rep: Reputation: 193Reputation: 193
The most common way to do that is to have the script run with SetUID permissions. Then whenever the script is executed by any user it will run with the permisssions of the owner of the file, here, root. You will not need to use "su" in the script with this method. To change the permissions on your script to SetUID, navigate to the directory where the script is located and run the following as root:

# chmod 4755 <script_name>

When you create the script, make root the owner and the above should work. Create the script as an ordinary user and get it working the way you want. Then change the owner with:

# chown root <script_name>

After that, run the chmod command above. In the above, "755" gives the owner read and execute permissions and the "4" in front sets the SetUID flag. This will prevent alteration of the script once it's set up and running properly. If you subsequently want to edit the script, you'll have to reset the permissions as root with "chmod 777"(i.e. rwx permissions), edit the script and set it back with "chmod 4755".

CAUTION: The above stikes me as an insecure practice. Ordinary users should not normally be given the ability to add users and running SetUID should be used sparingly since ordinary users are running an executable with root privileges. It is preferable to using "su" which would require that the root password be inputted automatically from a text file containing the root password and that text file would have to be readable by ordinary users, an obviously very insecure practice.
 
Old 04-30-2004, 11:57 PM   #3
ssudhi
LQ Newbie
 
Registered: Apr 2004
Posts: 6

Original Poster
Rep: Reputation: 0
Thanks for the reply.

I tried what you suggested but have not been succesful yet since I got the following error.

"useradd: unable to lock password file"

Any clue?

Thanks
ssudhi
 
Old 05-01-2004, 05:33 AM   #4
Soulful93
Member
 
Registered: Dec 2003
Location: Denver, CO
Distribution: SuSE 9.2 Slackware 10.1
Posts: 137

Rep: Reputation: 15
I just wrote this for my UNIX administration class. I figured it might help get you started, I've only tested it on a "root only system" as I'm not even going to start adding and removing users on my main box for obvious security reasons.

It's kind of ugly, but it seems to work ok.

:code:admin - lets users add and modify users

clear
# show the menu
clear

tput cup 10 20
tput rmso
echo "Please choose form the following options:"
tput rmso
tput cup 12 25
echo " 1 List all account information"
tput cup 13 25
echo " 2 Add a user"
tput cup 14 30
echo " 3 Remove a user"
tput cup 15 30
echo " 4 Change a user's password"
tput cup 16 30
echo " 5 Add a new group"
tput cup 17 30
echo " 6 Remove a group"
tput cup 18 30
tput cup 19 25

echo -n "Selection:"
read choice

# determine which choice was selected
case $choice in
[1])
# list all users
cd /etc
cat passwd

;;

# add a user
[2]) echo "Add a user"
echo "What is the user name of the new user?"
read username
echo "Please specify a group name"
read group name
useradd -g "$fullname" $username $group name

;;

# remove a user
[3]) echo "Remove a user"
echo "What is the username of the user you would like to remove?"
read username

userdel -r $username

;;

# change a users password
[4])
echo "Type the username"
read username

passwd $username

;;

# add a new group
[5])
echo "Please type the new group's id"
read group id

groupadd -r $group id

;;

# remove a group
[6])
echo "Please type the group id of the group to be removed"
read group id

groupdel $group id

;;



esac

EDIT: I just tried it on SUSE 9.0 (not signed in as root) box and the useradd is working. All I issued was chmod ugo+x addrmo and then I ran it.

Last edited by Soulful93; 05-01-2004 at 05:41 AM.
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
Shell Script to add samba users dickohead Programming 14 11-18-2016 03:28 AM
add multiple users(Script) amer_58 Programming 22 02-22-2013 10:09 AM
Shell Script: Add Users from file flobadon Programming 3 12-07-2004 04:49 PM
Script thats add users automatically embalmedlenin *BSD 1 09-14-2003 05:34 PM
a script that go read the users names in a file and automaticly add then with a commo tumemanques211 Programming 2 03-22-2002 03:13 PM


All times are GMT -5. The time now is 10:05 AM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration