How to block use of USB Storage on RHEL.

In your production environment, you might want to block the use of USB Storage devices (like pendrive) and display a message to user who is trying to do so. This can be achieved by replacing the usb_storage module in following way:

[root@SwitchRoot ~]# vim /etc/modprobe.d/usb-storage.conf

install     usb_storage       logger "User with uid $UID is trying to use usb storage" && zenity --warning --text "USB Storage not allowed" 2> /dev/null || echo "USB Storage not allowed" > /dev/tty0

Verify it by using a pendrive or with the following command:

[root@instructor ~]# modprobe usb_storage
USB Storage not allowed

Above config will also generate a log message in /var/log/messages and will display a Graphical Notification on GUI.