RH134 - ch07s07

setsebool activates/deactivates SELinux policy rules.
semanage boolean -l displays the persistent value of SELinux Booleans.
Man pages that end with _selinux often provide useful information about SELinux Booleans.

Objectives

After completing this section, students should be able to use SELinux Booleans to make adjustments to policy behavior.

Managing SELinux Booleans

SELinux Booleans

SELinux Booleans are switches that change the behavior of the SELinux policy. SELinux Booleans are rules that can be enabled or disabled. They can be used by security administrators to tune the policy to make selective adjustments.

The selinux-policy-devel package provides many manual pages, *_selinux(8), which explain the purpose of the Booleans available for various services. If this package has been installed, the man -k '_selinux' command can list these documents.

The getsebool command is used to display SELinux Booleans and setsebool is used to modify them. setsebool -P modifies the SELinux policy to make the modification persistent. semanage boolean -l will show whether or not a Boolean is persistent, along with a short description of the Boolean.

[root@serverX ~]# getsebool -a
abrt_anon_write --> off
abrt_handle_event --> off
abrt_upload_watch_anon_write --> on
antivirus_can_scan_system --> off
antivirus_use_jit --> off
...
[root@serverX ~]# getsebool httpd_enable_homedirs
httpd_enable_homedirs --> off
[root@serverX ~]# setsebool httpd_enable_homedirs on
[root@serverX ~]# semanage boolean -l | grep httpd_enable_homedirs
httpd_enable_homedirs          (on   ,  off)  Allow httpd to enable homedirs
[root@serverX ~]# getsebool httpd_enable_homedirs
httpd_enable_homedirs --> on
[root@serverX ~]# setsebool -P httpd_enable_homedirs on
[root@serverX ~]# semanage boolean -l | grep httpd_enable_homedirs
httpd_enable_homedirs          (on   ,   on)  Allow httpd to enable homedirs

To only list local modifications to the state of the SELinux booleans (any setting that differs from the default in the policy), the command semanage boolean -l -C can be used.

[root@serverX ~]# semanage boolean -l -C
SELinux boolean                State  Default Description

cron_can_relabel               (off   ,   on)  Allow cron to can relabel

References

booleans(8), getsebool(8), setsebool(8), semanage(8), semanage-boolean(8) man pages

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Is It possible to reset root password when the system is on multi-user.target?

jennifer1987

27 lip 2023

Hi thereWell, i have a question, Is It possible to reset root password when the system is on multi-user.target? I was not be able to found a foro o some information related with this and another question that I have, If the grub menu dont show up, is it posible to reset the root password?

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Red Hat System Administration II (RH134)

Haley_Ruccio

21 lip 2023

Build the skills to perform the key tasks needed to become a full-time Linux administratorRed Hat System Administration II (RH134) is the second part of the RHCSA training track for IT professionals who have already attended Red Hat System Administration I. The course goes deeper into core Linux system administration skills in storage configuration and management, installation and deployment of Red Hat Enterprise Linux, management of security features such as SELinux, control of recurring system tasks, management of the boot process and troubleshooting, basic system tuning, and command-line automation and productivity. This course assumes that students have attended Red Hat System Administration I (RH124).Experienced Linux administrators who seek rapid preparation for the RHCSA certification should instead start with RHCSA Rapid Track (RH199).This course is based on Red Hat Enterprise Linux 9.0.Course summaryInstall Red Hat Enterprise Linux using scalable methodsAccess security files, file systems, and networksExecute shell scripting and automation techniquesManage storage devices, logical volumes, and file systemsManage security and system accessControl the boot process and system servicesRun containersAudience for this courseThis course is geared toward Windows system administrators, network administrators, and other system administrators who are interested in supplementing current skills or backstopping other team members, in addition to Linux system administrators who are responsible for these tasks:Configuring, installing, upgrading, and maintaining Linux systems using established standards and proceduresProviding operational supportManaging systems for monitoring system performance and availabilityWriting and deploying scripts for task automation and system administrationRecommended trainingSuccessful completion of Red Hat System Administration I (RH124) is recommended.Experienced Linux administrators seeking to accelerate their path toward becoming a Red Hat Certified System Administrator should start with the RHCSA Rapid Track course (RH199).Take our free assessment to gauge whether this offering is the best fit for your skills.Technology considerationsThere are no special technology requirements.This course is not designed for bring your own device (BYOD).Internet access is not required, but is recommended to allow students to research and access Red Hat online resources.

Welcome to the Red Hat System Administration II (RH134) group in the Red Hat Learning Community!

Deanna

18 lip 2023

We are excited to launch a space dedicated to the Red Hat Training course Red Hat System Administration II! To gain the most value from this group - click the "Join Group" button in the upper right hand corner.We encourage group members to collaborate in this group to discuss topics, ask questions, share best practices and tips, provide course feedback, and share their accomplishments as it relates to RH134.Read more about Red Hat System Administration II here.

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Revision: rh134-7-63a207e