USBGuard

Using usbguard is pretty essential to protect against common attacks like malicious devices, rubber duckies, OMG cables or the “governmental 3 letter agency equivalents”.

Especially thunderbolt (which can be blocked globally, see this config as to how can grant attackers access to your RAM, which means encryption keys and more.

  1. Install USBGuard

    Debian/Ubuntu or Linux mint:

    sudo apt install usbguard usbutils udisks2 usbguard-notifier

    Fedora:

    sudo dnf install -y usbguard usbguard-notifier usbguard-selinux

  2. Set it up

Make sure to have your keyboard and mouse plugged in.

These commands will permanently allow all currently connected devices:

pkexec sh -c '
        mkdir -p /var/log/usbguard
        mkdir -p /etc/usbguard
        chmod 755 /etc/usbguard
        usbguard generate-policy > /etc/usbguard/rules.conf
        systemctl enable --now usbguard.service
        usbguard add-user $1
    ' -- $ACTIVE_USERNAME
    systemctl enable --user --now usbguard-notifier.service