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Documentation | 2025.5

# SELinux configuration

P4 Code Review supports SELinux which is an advanced access control mechanism that improves security for Linux distributions.

SELinux operates in one of three modes:

- enforcing: this mode blocks and logs any actions that do not match the defined security policy. This is the default mode for SELinux.
- permissive: this mode logs actions that do not match the defined security policy but these actions are not blocked.
- disabled: in this mode SELinux is off, actions are not blocked and are not logged.

To check the mode SELinux is operating in, view the `/etc/selinux/config` file with vi or a similar editor:

root $ vi /etc/selinux/config

SELinux must be configured to enable it to work correctly with P4 Code Review, these configuration steps are shown below.

You must complete the P4 Code Review package Installation steps, and the Post-installation configuration steps before configuring SELinux.

### Configure SELinux to enforcing mode

Run the following commands as root:

1. Install the package that contains the semanage configuration tool, this is used to configure SELinux:

Follow the instructions for your OS distribution:

- RHEL 8: Install the `policycoreutils-python-utils` package:

root $ yum install policycoreutils-python-utils

- RHEL 9: Install the `policycoreutils-python-utils` package:

root $ yum install policycoreutils-python-utils

2. Check the current SELinux mode:

root $ getenforce

3. SELinux will report its mode as; `enforcing`, `permissive`, or `disabled`.
   1. If the mode is not set correctly edit the `/etc/selinux/config` file with vi or a similar editor.

   root $ vi /etc/selinux/config

   2. Edit the config file so that `SELinux=` is set to `enforcing` .
   3. Save the config file.
   4. Reboot the server to complete the SELinux mode change.
4. Allow content in /opt/perforce/swarm to be read and written by the httpd process:

    root $ semanage fcontext -a -t httpd_sys_rw_content_t "/opt/perforce/swarm(/.*)?"
    root $ restorecon -R /opt/perforce/swarm

5. Allow the httpd process to connect to other networked services, for example P4D and Redis:

root $ setsebool -P httpd_can_network_connect 1

6. Allow comment attachment thumbnails to be created:

root $ setsebool -P httpd_tmp_exec 1

7. Allow the files in p4-bin to be executed by the httpd process:

    root $ semanage fcontext -a -t httpd_sys_script_exec_t '/opt/perforce/swarm/p4-bin(/.*)?'
    root $ restorecon -R -v /opt/perforce/swarm/p4-bin

8. Remove the executable constraints on Redis, allowing it to be started by systemd at boot time:

    root $ semanage fcontext -a -t bin_t /opt/perforce/swarm/sbin/redis-server-swarm
    root $ restorecon -v /opt/perforce/swarm/sbin/redis-server-swarm

9. Restart the system:

root $ systemctl restart httpd

10. Check that you can log in to P4 Code Review.
11. Only if required: Relabel your filesystem, see note before relabeling:

Relabeling your file system can be a time consuming process, it is recommended that you only do this if you need to. This depends entirely on your SELinux setup, Perforce cannot give you advice on this.

root $ touch /.autorelabel

12. Reboot the server.
13. Check that you can log in to P4 Code Review.
14. SELinux is now configured for P4 Code Review.

If you can not log in to P4 Code Review it is possible that SELinux is blocking P4 Code Review because its configuration is incorrect. You will need to troubleshoot the SELinux configuration to find any issues.

Install the `setroubleshoot` package, this contains `sealert` which is used when troubleshooting SELinux:

root $ yum install setroubleshoot

`sealert` helps you to interpret the contents of the `audit.log`. Run the following command:

root $ sealert -a /var/log/audit/audit.log

Error message: If you see an error message with a title similar to the message below, it may be because you are running RHEL on a Virtual Machine (VM).

root $ SELinux is preventing /usr/sbin/ldconfig from write access on the directory etc.

Install `open-vm-tools` on the VM and reboot the VM.

root $ yum install open-vm-tools

### Configure SELinux permissive or disabled mode

Run the following as root:

1. Check the current SELinux mode:

root $ getenforce

2. SELinux will report its mode as; `enforcing`, `permissive`, or `disabled`.
   1. If the mode is not set correctly edit the `/etc/selinux/config` file with vi or a similar editor.

   root $ vi /etc/selinux/config

   2. Edit the config file so that `SELinux=` is set to `permissive` or `disabled` as required.
   3. Save the config file.
   4. Reboot the server to complete the SELinux mode change.
3. Check that you can log in to P4 Code Review.
4. SELinux is now configured for P4 Code Review.

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