Debian 7.0
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Set Admin User
2013/05/06
[1] If you set root password and activated the root during installation, configure settings to limit users who switch to root.
root@dlp:~#
usermod -G adm wheezy

root@dlp:~#
vi /etc/pam.d/su
# line 15: uncomment and add the follows

auth   required   pam_wheel.so  
group=adm
[2] Try to switch to root from a user you set to allow.
root@dlp:~#
su - wheezy
# switch to a user

wheezy@dlp:~$
su -
# switch to root

Password:
root@dlp:~#
# normally done
[3] Add a test user and try to confirm the user can not switch to root.
root@dlp:~#
adduser testuser
# add test user

Adding user `testuser' ...
Adding new group `testuser' (1001) ...
Adding new user `testuser' (1001) with group `testuser' ...
Creating home directory `/home/testuser' ...
Copying files from `/etc/skel' ...
Enter new UNIX password:
# set password

Retype new UNIX password:
# confirm

passwd: password updated successfully
Changing the user information for testuser
Enter the new value, or press ENTER for the default
    Full Name []: testuser
# input the name

    Room Number []: testuser
# input any one

    Work Phone []:
# input any one(it's Ok with empty)

    Home Phone []:
# input any one(it's Ok with empty)

    Other []:
# input any one(it's Ok with empty)

Is the information correct? [y/N]
y
root@dlp:~#
su - testuser
# switch to the user

testuser@dlp:~$
su -
# switch to root

Password:
su: Permission denied
testuser@dlp:~$
# normally access denied
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