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#!/bin/bash
#
# USB hotplug switcher.
# See https://links.fluxo.info/tags/badusb
# https://www.kernel.org/doc/Documentation/usb/authorization.txt
# http://marc.info/?l=git-commits-head&m=131166366113680&w=2
# https://github.com/dkopecek/usbguard (alternative approach)
# Parameters
BASENAME="`basename $0`"
# Sudo config
if [ "`whoami`" != 'root' ]; then
SUDO="sudo"
fi
# Set hotplug state
function usb_set_state {
echo "Applying at /sys/module/usbcore/parameters/authorized_default..."
$SUDO su -c "echo $1 > /sys/module/usbcore/parameters/authorized_default"
for bus in /sys/bus/usb/devices/usb*; do
echo "Applying at ${bus}/authorized_default..."
$SUDO su -c "echo $1 > ${bus}/authorized_default"
done
}
# Dispatch
if [ "$BASENAME" == 'usb-enable' ]; then
usb_set_state 1
elif [ "$BASENAME" == 'usb-disable' ]; then
usb_set_state 0
elif [ "$BASENAME" == 'usb-status' ]; then
status="`cat /sys/module/usbcore/parameters/authorized_default`"
# The "authorized_default" module parameter of usbcore controls the default
# for the authorized_default variable of each USB host controller.
#
# -1 is authorized for all devices except wireless (default, old behaviour)
# 0 is unauthorized for all devices
# 1 is authorized for all devices
if [ "$status" == "0" ]; then
echo "Hotplug disabled."
elif [ "$status" == "1" ]; then
echo "Hotplug enabled."
elif [ "$status" == "-1" ]; then
echo "Hotplug enabled except wireless"
fi
fi
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