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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2017-2018 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package builtin
import (
"gitee.com/mysnapcore/mysnapd/interfaces"
"gitee.com/mysnapcore/mysnapd/interfaces/udev"
)
const joystickSummary = `allows access to joystick devices`
const joystickBaseDeclarationSlots = `
joystick:
allow-installation:
slot-snap-type:
- core
deny-auto-connection: true
`
const joystickConnectedPlugAppArmor = `
# Description: Allow reading and writing to joystick devices
#
# Old joystick interface
#
# Per https://github.com/torvalds/linux/blob/master/Documentation/admin-guide/devices.txt
# only js0-js31 is valid so limit the /dev and udev entries to those devices.
/dev/input/js{[0-9],[12][0-9],3[01]} rw,
/run/udev/data/c13:{[0-9],[12][0-9],3[01]} r,
#
# New evdev-joystick interface
#
# Per https://github.com/torvalds/linux/blob/master/Documentation/admin-guide/devices.txt
# the minor is 65 and up so limit udev to that.
/run/udev/data/c13:{6[5-9],[7-9][0-9],[1-9][0-9][0-9]*} r,
# /dev/input/event* is unfortunately not namespaced and includes all input
# devices, including keyboards and mice, which allows input sniffing and
# injection. Until we have inode tagging of devices, we use a glob rule here
# and rely on udev tagging to only add evdev devices to the snap's device
# cgroup that are marked with ENV{ID_INPUT_JOYSTICK}=="1". As such, even though
# AppArmor allows all evdev, the device cgroup does not.
/dev/input/event[0-9]* rw,
# Allow reading for supported event reports for all input devices. See
# https://www.kernel.org/doc/Documentation/input/event-codes.txt
# FIXME: this is a very minor information leak and snapd should instead query
# udev for the specific accesses associated with the above devices.
/sys/devices/**/input[0-9]*/capabilities/* r,
`
// Add the old joystick device (js*) and any evdev input interfaces which are
// marked as joysticks. Note, some input devices are known to come up as
// joysticks when they are not and while this rule would tag them, on systems
// where this is happening the device is non-functional for its intended
// purpose. In other words, in practice, users with such devices will have
// updated their udev rules to set ENV{ID_INPUT_JOYSTICK}="" to make it work,
// which means this rule will no longer match.
//
// Because of the unconditional /dev/input/event[0-9]* AppArmor rule, we need
// to ensure that the device cgroup is in effect even when there are no
// joysticks present so that we don't give away all input to the snap. Use
// /dev/full for this purpose.
var joystickConnectedPlugUDev = []string{
`KERNEL=="js[0-9]*"`,
`KERNEL=="event[0-9]*", SUBSYSTEM=="input", ENV{ID_INPUT_JOYSTICK}=="1"`,
`KERNEL=="full", SUBSYSTEM=="mem"`,
}
type joystickInterface struct {
commonInterface
}
func (iface *joystickInterface) UDevConnectedPlug(spec *udev.Specification, plug *interfaces.ConnectedPlug, slot *interfaces.ConnectedSlot) error {
spec.TriggerSubsystem("input/joystick")
return iface.commonInterface.UDevConnectedPlug(spec, plug, slot)
}
func init() {
registerIface(&joystickInterface{commonInterface{
name: "joystick",
summary: joystickSummary,
implicitOnCore: true,
implicitOnClassic: true,
baseDeclarationSlots: joystickBaseDeclarationSlots,
connectedPlugAppArmor: joystickConnectedPlugAppArmor,
connectedPlugUDev: joystickConnectedPlugUDev,
}})
}
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