Configure sudo
2014/07/08
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Configure sudo to separate users' duty if some people share privileges.
It's unnecessarry to install sudo manually because it is installed by default even if "Minimal Install".
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[1] | Transfer root privilege to a user all. |
[root@dlp ~]#
# add at the last line: user 'cent' can use all root privilege
cent ALL=(ALL) ALL
# how to write ⇒ destination host=(owner) command
# make sure with the user 'cent'
[cent@dlp ~]$
/usr/bin/cat /etc/shadow
cat: /etc/shadow: Permission denied
# denied normally
[sudo] password for cent:
# own password
daemon:*:16231:0:99999:7::: adm:*:16231:0:99999:7::: lp:*:16231:0:99999:7::: ... ...
# just executed
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[2] | In addition to the setting [1], set that some commands are not allowed. |
[root@dlp ~]#
# near line 49: add aliase for the kind of shutdown commands
Cmnd_Alias SHUTDOWN = /sbin/halt, /sbin/shutdown, \
/sbin/poweroff, /sbin/reboot, /sbin/init
# add ( commands in aliase 'SHUTDOWN' are not allowed )
cent
ALL=(ALL)
ALL,
!SHUTDOWN
# make sure with the user 'cent'
[cent@dlp ~]$ Sorry, user cent is not allowed to execute '/sbin/shutdown -r now' as root on dlp.srv.world.
# denied normally
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[3] | Transfer some commands with root privilege to users in a group. |
[root@dlp ~]#
# near line 51: add aliase for the kind of user management comamnds
Cmnd_Alias USERMGR = /usr/sbin/useradd, /usr/sbin/userdel, /usr/sbin/usermod, \
/usr/bin/passwd
# add at the last line
%usermgr ALL=(ALL) USERMGR
# make sure with the user 'cent'
[cent@dlp ~]$ [cent@dlp ~]$
# done normally
[cent@dlp ~]$ Changing password for user testuser. New UNIX password: Retype new UNIX password: passwd: all authentication tokens updated successfully. |
[4] | Transfer a command with root privilege to a user. |
[root@dlp ~]#
# add at the last line
cent ALL=(ALL) /usr/sbin/visudo fedora ALL=(ALL) /usr/sbin/useradd, /usr/sbin/userdel, /usr/sbin/usermod, /usr/bin/passwd ubuntu ALL=(ALL) /bin/vi
# make sure with the user 'cent'
# possible to open and edit
## Sudoers allows particular users to run various commands as ## the root user, without needing the root password. ##
# make sure with the user 'fedora'
[fedora@dlp ~]$
[fedora@dlp ~]$
# done normally
# make sure with the user 'ubuntu'
# possible to open and edit
# grub.conf generated by anaconda # # Note that you do not have to rerun grub after making changes to this file # NOTICE: You have a /boot partition. This means that |
[5] | The logs for sudo are kept in '/var/log/secure', 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 at the last line
Defaults syslog=local1
[root@dlp ~]#
vi /etc/rsyslog.conf
# line 54: add
*.info;mail.none;authpriv.none;cron.none
;local1.none
/var/log/messages
# add the line, too
local1.* /var/log/sudo.log
systemctl restart rsyslog
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