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Examining and Breaking the NTP Service and Switching SELinux Modes

LaV 4.1: Examining and Breaking the NTP Service 

1.  Before breaking anything, it would be a good idea to see what NTP looks like when it is working properly. The ntpq c pe command displays the list of peer machines the local NTP server is synchronizing with. Login as root on your local workstation, stationX. example. com, and execute ntpq to confirm NTP 18 working. Your output

should look similar to the following:

instructor.exam LOCAL(0) 11 u 719 1024 377 4.360 8.931 0.832

2. Check to see if the NTP server, ntpd, is a SELinux protected service. Use ps to find out if it is. What command options did you use?

3. Break NTP by restoring a backup copy of its configuration file etc ntp conf First, copy it to root's home directory without providing any options to the cp command. Once you verify there is a backup copy, remove the original configuration file in etc. To recover from this mishap, move (don't copy) the backup into etc  ntp . conf and restart the ntpd service.

Are there any visual indications ntpd is not working properly? Check the state of the server to see what hosts it is synchronizing With.

4.  It looks like you will have to do some SELinux troubleshooting. Install the f setroubleshoot package. Once the package is installed, start the setroubleshootd daemo
Log out and back into your graphical console to allow GNOME to use any tools that were jllSt installed.

Switching SELinux Modes

Scenario: One way to temporarily “fix” an SELinux problem is to Change the SELinux mode to permissive mode.

1. Change the SELinux mode so SELinux doesn't enforce its policy rules. Restart the ntpd, daemon and confirm whether or not the service is working properly.

2.  Setting SELinux to permissive mode 13 an extreme measure that should only be used as a last

resort to get a service working when it has a SELinux 1ssue. This approach to troubleshooting impacts the security of every service running on the system in a negative way.

Restore SELinux so it enforces its policy rules. Restart the ntpd service and confirm NTP no longer functions properly.


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