Debian 9 Stretch
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Sudo Settings
2017/06/18
 
Configure Sudo to separate users' duty if some people share privileges.
[1] Install Sudo.
root@dlp:~#
apt -y install sudo

[2] Transfer root privilege to a user all.
root@dlp:~#
# add to the end: user [stretch] can use all root privilege

stretch   ALL=(ALL)   ALL
# how to write ⇒ destination host=(owner) command

# push [Ctrl + x] key to quit visudo
# verify with user [stretch]

stretch@dlp:~$
/sbin/shutdown -r now

shutdown: you must be root to do that!    
# denied normally

stretch@dlp:~$
sudo /sbin/shutdown -r now

[sudo] password for stretch:    
# stretch's password
stretch@dlp:~$
Broadcast message from root@dlp (pts/0) (Sun May 6 02:45:10 2011):
The system is going down for reboot NOW!  
# possible execute
[3] In addition to the setting [1], set that some commands are not allowed.
root@dlp:~#
# add alias for the kind of shutdown commands

# Cmnd alias specification
Cmnd_Alias SHUTDOWN = /sbin/halt, /sbin/shutdown, \
/sbin/poweroff, /sbin/reboot, /sbin/init, /bin/systemctl
# add ( commands in alias [SHUTDOWN] are not allowed )

stretch   ALL=(ALL)   ALL,
!SHUTDOWN
# verify with user [stretch]

stretch@dlp:~$
sudo /sbin/shutdown -r now

[sudo] password for stretch:
Sorry, user stretch is not allowed to execute '/sbin/shutdown -r now' as root on dlp.srv.world.  
# denied normally
[4] Transfer some commands with root privilege to users in a group.
root@dlp:~#
# add aliase for the kind of user management comamnds

# Cmnd alias specification
Cmnd_Alias USERMGR = /usr/sbin/adduser, /usr/sbin/useradd, /usr/sbin/newusers, \
/usr/sbin/deluser, /usr/sbin/userdel, /usr/sbin/usermod, /usr/bin/passwd
# add to the end

%usermgr   ALL=(ALL)   USERMGR
root@dlp:~#
groupadd usermgr

root@dlp:~#
vi /etc/group
# add a user in this group

usermgr:x:1002:
stretch
# verify with user [stretch]

stretch@dlp:~$
sudo /usr/sbin/useradd testuser

stretch@dlp:~$    
# done normally

stretch@dlp:~$
sudo /usr/bin/passwd testuser

Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
[5] Transfer some commands with root privilege to a user.
root@dlp:~#
# add to the end

fedora     ALL=(ALL) /usr/sbin/visudo
cent     ALL=(ALL) /usr/sbin/adduser, /usr/sbin/useradd, /usr/sbin/newusers, \
    /usr/sbin/deluser, /usr/sbin/userdel, /usr/sbin/usermod, /usr/bin/passwd
suse     ALL=(ALL) /usr/bin/vim
# verify with user [fedora]

fedora@dlp:~$
sudo /usr/sbin/visudo
# possible to open and edit

## Sudoers allows particular users to run various commands as
## the root user, without needing the root password.
##
# verify with user [cent]

cent@dlp:~$
sudo /usr/sbin/userdel -r testuser

cent@dlp:~$    
# done normally
# verify with user [suse]

suse@dlp:~$
sudo /usr/bin/vim /root/.profile
# possible to edit or save

# ~/.profile: executed by Bourne-compatible login shells.
[6] The logs for sudo are kept in '/var/log/auth.log', but there are many kind of logs in it. So if you'd like to keep only sudo's log in a file, Set like follows.
root@dlp:~#
# add to the end

Defaults syslog=local1
root@dlp:~#
vi /etc/rsyslog.conf
# line 61: add

local1.*                     /var/log/sudo.log
auth,authpriv.*          /var/log/auth.log

root@dlp:~#
systemctl restart rsyslog

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