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Creating USBGuard Rules

In this lab, we'll be creating rules within USBGuard. These rules are what will permit or deny a host to communicate with a USB device. We'll also look at defining how to treat USB devices that dont meet any of the configured rules. *This course is not approved or sponsored by Red Hat.*

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 30m
Last updated
Clock icon Jul 26, 2025

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Table of Contents

  1. Challenge

    Create USBGuard Rules for Permitted Devices

    1. Create a local file named rules.conf and add two allow lines
    [root@host]# nano rules.conf

    Enter these two lines:

    allow name "Ubikey"
allow serial "7856749487475"

    Press Ctrl+x to quit, and save at the prompt

    1. Commit the USBGuard rule changes by running the following command
    install -m 0600 -o root -g root rules.conf /etc/usbguard/rules.conf

  2. Challenge

    Set Rule for Devices that Don't Meet Criteria

    1. Edit the /etc/usbguard/usbguard-daemon.conf file
    [root@host]# nano /etc/usbguard/usbguard-daemon.conf

    Set the ImplicitPolicyTarget to block:

    ImplicitPolicyTarget=block

    Press Ctrl+x to quit, and save at the prompt

    1. Restart the USBGuard service
    [root@host]# systemctl restart usbguard.service
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