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Configure sudo
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| Configure sudo to separate users' duty if some people share privileges. |
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| [1] | Transfer root privilege to a user all |
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[root@dlp ~]# # add at the bottom: user 'cent' can use all root privilege
cent ALL=(ALL) ALL
# how to write ⇒ destination host=(owner) command # make sure with user 'cent' [cent@dlp ~]$ /sbin/shutdown -r now shutdown: you must be root to do that! # denied normally [cent@dlp ~]$ Password: # own password Broadcast message from root (pts/0) (Wed Aug 5 20:46:41 2009): The system is going down for reboot NOW! # just executed
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| [2] | In addition to the setting [1], some commands are not allow |
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[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', 'SOFTWARE' are not allowed ) # * 'SOFTWARE' is defined by default cent ALL=(ALL) ALL, !SHUTDOWN, !SOFTWARE # make sure with user 'cent' [cent@dlp ~]$ Password: Sorry, user cent is not allowed to execute '/sbin/shutdown -r now' as root on dlp.server-world.info. # denied [cent@dlp ~]$ Password: Sorry, user cent is not allowed to execute '/usr/bin/yum update' as root on dlp.server-world.info. # denied
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| [3] | Transfer some commands with root privilege to users in a group |
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[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 bottom %usermgr ALL=(ALL) USERMGR [root@dlp ~]# groupadd usermgr [root@dlp ~]# vi /etc/group # add users in this group usermgr:x:502: cent # make sure with user 'cent' [cent@dlp ~]$ [cent@dlp ~]$ # done normally [cent@dlp ~]$ 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 |
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[root@dlp ~]# # add at the bottom
cent ALL=(ALL) /usr/sbin/visudo fedora ALL=(ALL) /usr/sbin/useradd, /usr/sbin/userdel, /usr/sbin/usermod, /usr/bin/passwd suse ALL=(ALL) /bin/vi # make sure with user 'cent' [cent@dlp ~]$ # 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 'fedora' [fedora@dlp ~]$ [fedora@dlp ~]$ # done normally # make sure with user 'suse' [suse@dlp ~]$ # 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. |
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[root@dlp ~]# # add at the bottom Defaults syslog=local1 [root@dlp ~]# cp /etc/syslog.conf /etc/syslog.conf.bk [root@dlp ~]# vi /etc/syslog.conf # The authpriv file has restricted access. local1.* /var/log/sudo.log # line 10: add authpriv.* /var/log/secure [root@dlp ~]# /etc/rc.d/init.d/syslog restart Shutting down kernel logger: [ OK ] Shutting down system logger: [ OK ] Starting system logger: [ OK ] Starting kernel logger: [ OK ]
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