Creating USBGuard Rules

30 minutes
  • 2 Learning Objectives

About this Hands-on Lab

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.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

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

  2. Commit the USBGuard rule changes by running the following command

    install -m 0600 -o root -g root rules.conf /etc/usbguard/rules.conf
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

  2. Restart the USBGuard service

    [root@host]# systemctl restart usbguard.service

Additional Resources

A host has been setup with USBGuard for testing purposes. You've been assigned the task of setting up rules for USBGuard. The following rules need to be setup and made functional on the host so they can be tested.

  • USB device named "Ubikey" should be allowed
  • USB device with the serial number "7856749487475" should be allowed
  • All USB devices that don't meet any of these rules should be blocked.

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