# Copyright 2018 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

description     "USBGuard - a service that handles enforcing USB device policy."
author          "allenwebb@chromium.org"

start on screen-locked and started usbguard-wrapper
stop on screen-unlocked or start-user-session

respawn
respawn limit 15 5

umask 066

expect fork

pre-start script
  if ! /usr/share/cros/init/is_feature_enabled.sh 'USBGuard'; then
    logger -t "${UPSTART_JOB}" 'USBGuard disabled.'
    stop
    exit 0
  fi
end script

# These flags should be kept in sync with "usbguard generate-policy" in
# usbguard-wrapper.conf except the "-i", "-b ...", and "-k ..." flags.
#
# -u    Set the user to usbguard.
# -g    Set the group to usbguard.
# -c    Provide CAP_DAC_OVERRIDE for write access without root to /sys/bus/usb
# -l    Enter a new IPC namespace.
# -p    Enter a new pid namespace.
# -e    Enter a new network namespace because usbguard-daemon opens a
#       unix socket for communication with the usbguard cli client, and
#       is used for things like "list-devices".
# --uts Enter a new UTS namespace.
# -n    Set no_new_privs.
# -i    Exit minijail after forking usbguard-daemon.
# --profile=minimalistic-mountns Setup a mount namespace with some basic
#       mountpoints.
# -b,-k Bind mount /sys writeable, create.
# -S    Limit the set of accepted system calls.
#
# The usbguard-daemon flags are:
# -s    Log to syslog.
exec /sbin/minijail0 -u usbguard -g usbguard -c 2 -l -p -e --uts -n -i \
    --profile=minimalistic-mountns \
    -b /sys,,1 \
    -k 'tmpfs,/run,tmpfs,MS_NODEV|MS_NOEXEC|MS_NOSUID,mode=755,size=10M' \
    -b /run/dbus \
    -b /run/usbguard \
    -S /usr/share/policy/usbguard-daemon-seccomp.policy \
    /usr/sbin/usbguard-daemon -s