Creating USBGuard Rules

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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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Lab Info

Level

Intermediate

Last updated

Jul 26, 2025

Duration

30m

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
```
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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