Skip to main content

Sudoers: when multiple entries match

I had a minor interpretation issue with a paragraph in the Sudoers Manual. So I wrote to the sudo mailinglist and asked a clarification... Here is their answer, which made perfect sense! Thanks!


Let's say you have a user, bob, who is a member of a group and sudo has a configuration like:
User_Alias ADMINS=bob,mike,tom
ADMINS ALL = (ALL) PASSWD: /bin/ps, /bin/ls, /usr/sbin/shutdown -y -g0 -i0
bob ALL = (ALL) PASSWD: /usr/sbin/shutdown

This says that bob has multiple entries (in the group and an explicit entry) but the rules say that his last match contradicts the ADMINS. It will give his last match... i.e., he can use shutdown with any argument... if you reverse these entries:
bob ALL = (ALL) PASSWD: /usr/sbin/shutdown
ADMINS ALL = (ALL) PASSWD: /bin/ps, /bin/ls, /usr/sbin/shutdown -y -g0 -i0
then you have effectively restricted bob to the same command as the other admins. and therefore not given him any special treatment...
Labels:

Comments

Post a Comment

Popular posts from this blog

Preventing PuTTY timeouts

Just found a great tip to prevent timeouts of PuTTY sessions. I'm fine with timeouts by the host, but in our case the firewall kills sessions after 30 minutes of inactivity... When using PuTTY to ssh to your Linux/Unix servers, be sure to use the feature to send NULL packets to prevent a timeout. I've set it to once every 900 seconds, i.e. 15 minutes... See screenshot on the right.
1 comment
Read more

Tuning the nscd name cache daemon

I've been playing a bit with the nscd now and want to share some tips related to tuning the nscd.conf file. To see how the DNS cache is doing, use nscd -g. nscd configuration: 0 server debug level 26m 57s server runtime 5 current number of threads 32 maximum number of threads 0 number of times clients had to wait yes paranoia mode enabled 3600 restart internal passwd cache: no cache is enabled [other zero output removed] group cache: no cache is enabled [other zero output removed] hosts cache: yes cache is enabled yes cache is persistent yes cache is shared 211 suggested size 216064 total data pool size 1144 used data pool size 3600 seconds time to live for positive entries 20 seconds time to live for negative entries 66254 cache hi...
2 comments
Read more

Dell Linux - OMSA Hardware Monitoring

Just getting started using Dell's OpenManage Server Administrator (OMSA) on our Oracle Linux platform. There are some confusing instructions going around so it's not immediately clear what to do, hence my blogging here. :) There is a site on Dell - Hardware Monitoring , as well as a wiki with instruction on how to setup their OMSA tooling using yum or up2date. [update]My first update for their instructions: be sure your server has Internet access, as most servers will use a proxy or so. use export http_proxy=http://yourproxy.example.com:port to configure it just for the session, and setup up2date to use an HTTP proxy by editing the settings in /etc/sysconfig/rhn/up2date .
2 comments
Read more