Configure sudo2010/05/25

	Configure sudo to separate users' duty if some people share privileges.
[1]	Transfer root privilege to a user all

[root@dlp ~]#

visudo

# add at the bottom: user 'fedora' can use all root privilege

fedora

ALL=(ALL)

ALL

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

# make sure with user 'fedora'

[fedora@dlp ~]$

/sbin/shutdown -r now

shutdown: you must be root to do that!

# denied normally

[fedora@dlp ~]$

sudo /sbin/shutdown -r now

Password:

# own password

The system is going down for reboot NOW!

# just executed

[2]	In addition to the setting [1], some commands are not allow

[root@dlp ~]#

visudo

# 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', 'SOFTWARE' are not allowed )

# * 'SOFTWARE' is defined by default

fedora

ALL=(ALL)

ALL,

!SHUTDOWN, !SOFTWARE

# make sure with user 'cent'

[fedora@dlp ~]$

sudo /sbin/shutdown -r now

Password:
Sorry, user fedora is not allowed to execute '/sbin/shutdown -r now' as root on dlp.server-world.info.

# denied

[fedora@dlp ~]$

sudo /usr/bin/yum update

Password:
Sorry, user fedora is not allowed to execute '/usr/bin/yum update' as root on dlp.server-world.info.

# denied

[3]	Transfer some commands with root privilege to users in a group

[root@dlp ~]#

visudo

# 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 bottom

%usermgr ALL=(ALL) USERMGR

[root@dlp ~]#

groupadd usermgr

[root@dlp ~]#

vi /etc/group

# add users in this group

usermgr:x:502:

fedora

# make sure with user 'fedora'

[fedora@dlp ~]$

sudo /usr/sbin/useradd testuser

[fedora@dlp ~]$

# done normally

[fedora@dlp ~]$

sudo /usr/bin/passwd testuser

Changing password for user testuser.
New UNIX password:

# set testuser's password

Retype new UNIX password:
passwd: all authentication tokens updated successfully.

[4]	Transfer a command with root provilege to a user

[root@dlp ~]#

visudo

# add at the bottom

fedora

ALL=(ALL) /usr/sbin/visudo

cent

ALL=(ALL) /usr/sbin/useradd, /usr/sbin/userdel, /usr/sbin/usermod, /usr/bin/passwd

suse

ALL=(ALL) /bin/vi

# make sure 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.
##

# make sure with user 'cent'

[cent@dlp ~]$

sudo /usr/sbin/userdel -r testuser

[cent@dlp ~]$

# done normally

# make sure with user 'suse'

[suse@dlp ~]$

sudo /bin/vi /boot/grub/grub.conf

# 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' log in a file, Set like follows.

[root@dlp ~]#

visudo

# add at the bottom

Defaults syslog=local1

[root@dlp ~]#

cp /etc/rsyslog.conf /etc/rsyslog.conf.bk

[root@dlp ~]#

vi /etc/rsyslog.conf

# The authpriv file has restricted access.

local1.*

/var/log/sudo.log

# line 42: add

authpriv.*

/var/log/secure

[root@dlp ~]#

/etc/rc.d/init.d/rsyslog restart

Shutting down system logger:

[ OK ]

Starting system logger:

[ OK ]

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