github.com/kubiko/snapd@v0.0.0-20201013125620-d4f3094d9ddf/interfaces/builtin/raw_usb.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2017 Canonical Ltd
     5   *
     6   * This program is free software: you can redistribute it and/or modify
     7   * it under the terms of the GNU General Public License version 3 as
     8   * published by the Free Software Foundation.
     9   *
    10   * This program is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU General Public License for more details.
    14   *
    15   * You should have received a copy of the GNU General Public License
    16   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17   *
    18   */
    19  
    20  package builtin
    21  
    22  const rawusbSummary = `allows raw access to all USB devices`
    23  
    24  const rawusbBaseDeclarationSlots = `
    25    raw-usb:
    26      allow-installation:
    27        slot-snap-type:
    28          - core
    29      deny-auto-connection: true
    30  `
    31  
    32  const rawusbConnectedPlugAppArmor = `
    33  # Description: Allow raw access to all connected USB devices.
    34  # This gives privileged access to the system.
    35  /dev/bus/usb/[0-9][0-9][0-9]/[0-9][0-9][0-9] rw,
    36  
    37  # Allow access to all ttyUSB devices too
    38  /dev/tty{USB,ACM}[0-9]* rwk,
    39  
    40  # Allow raw access to USB printers (i.e. for receipt printers in POS systems).
    41  /dev/usb/lp[0-9]* rwk,
    42  
    43  # Allow detection of usb devices. Leaks plugged in USB device info
    44  /sys/bus/usb/devices/ r,
    45  /sys/devices/pci**/usb[0-9]** r,
    46  /sys/devices/platform/{sbc,soc}/*.usb/usb[0-9]** r,
    47  
    48  /run/udev/data/c16[67]:[0-9] r, # ACM USB modems
    49  /run/udev/data/b180:*    r, # various USB block devices
    50  /run/udev/data/c18[089]:* r, # various USB character devices: USB serial converters, etc.
    51  /run/udev/data/+usb:* r,
    52  `
    53  
    54  const rawusbConnectedPlugSecComp = `
    55  # Description: Allow raw access to all connected USB devices.
    56  # This gives privileged access to the system.
    57  
    58  # kernel uevents
    59  socket AF_NETLINK - NETLINK_KOBJECT_UEVENT
    60  `
    61  
    62  var rawusbConnectedPlugUDev = []string{
    63  	`SUBSYSTEM=="usb"`,
    64  	`SUBSYSTEM=="usbmisc"`,
    65  	`SUBSYSTEM=="tty", ENV{ID_BUS}=="usb"`,
    66  }
    67  
    68  func init() {
    69  	registerIface(&commonInterface{
    70  		name:                  "raw-usb",
    71  		summary:               rawusbSummary,
    72  		implicitOnCore:        true,
    73  		implicitOnClassic:     true,
    74  		baseDeclarationSlots:  rawusbBaseDeclarationSlots,
    75  		connectedPlugAppArmor: rawusbConnectedPlugAppArmor,
    76  		connectedPlugSecComp:  rawusbConnectedPlugSecComp,
    77  		connectedPlugUDev:     rawusbConnectedPlugUDev,
    78  	})
    79  }