File virtualbox-default.virtualbox of Package virtualbox.openSUSE_Leap_15.0_Update

# /etc/default/virtualbox
#
# -------------------------------------------------------------------------------------------------
# In the "SHUTDOWN_USERS" list all users for which a check for runnings VMs should be done during
# shutdown of "vboxdrv" resp. the server:
# SHUTDOWN_USERS="foo bar"
#
# Set "SHUTDOWN" to one of "poweroff", "acpibutton" or "savestate" depending on which of the
# shutdown methods for running VMs are wanted:
# SHUTDOWN="poweroff"
# SHUTDOWN="acpibutton"
# SHUTDOWN="savestate"
# -------------------------------------------------------------------------------------------------
#
#SHUTDOWN_USERS="foo bar"
#SHUTDOWN="savestate"

# -------------------------------------------------------------------------------------------------
# By default, vboxdrv creates a file /etc/udev/rules.d/60-vboxdrv.rules every time, it is started, 
# that allows full control of this hosts usb devices in virtual machines (given, you allow accessing
# them with the GUI).
# In order to control this ability yourself, copy the generated /etc/udev/rules.d/60-vboxdrv.rules
# file to another name and modify to your needs, e.g. comment out all lines beginning with SUBSYSTEM,
# which will make this hosts usb devices inaccessible AND enable the next line.
#INSTALL_NO_UDEV=1