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

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2016 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 mountObserveSummary = `allows reading mount table and quota information`
    23  
    24  const mountObserveBaseDeclarationSlots = `
    25    mount-observe:
    26      allow-installation:
    27        slot-snap-type:
    28          - core
    29      deny-auto-connection: true
    30  `
    31  
    32  // http://bazaar.launchpad.net/~ubuntu-security/ubuntu-core-security/trunk/view/head:/data/apparmor/policygroups/ubuntu-core/16.04/mount-observe
    33  const mountObserveConnectedPlugAppArmor = `
    34  # Description: Can query system mount and disk quota information. This is
    35  # restricted because it gives privileged read access to mount arguments and
    36  # should only be used with trusted apps.
    37  
    38  /{,usr/}bin/df ixr,
    39  
    40  # Needed by 'df'. This is an information leak
    41  @{PROC}/mounts r,
    42  owner @{PROC}/@{pid}/mounts r,
    43  owner @{PROC}/@{pid}/mountinfo r,
    44  owner @{PROC}/@{pid}/mountstats r,
    45  /sys/devices/*/block/{,**} r,
    46  
    47  @{PROC}/swaps r,
    48  
    49  # This is often out of date but some apps insist on using it
    50  /etc/mtab r,
    51  /etc/fstab r,
    52  `
    53  
    54  const mountObserveConnectedPlugSecComp = `
    55  # Description: Can query system mount and disk quota information. This is
    56  # restricted because it gives privileged read access to mount arguments and
    57  # should only be used with trusted apps.
    58  
    59  quotactl Q_GETQUOTA - - -
    60  quotactl Q_GETINFO - - -
    61  quotactl Q_GETFMT - - -
    62  quotactl Q_XGETQUOTA - - -
    63  quotactl Q_XGETQSTAT - - -
    64  `
    65  
    66  func init() {
    67  	registerIface(&commonInterface{
    68  		name:                  "mount-observe",
    69  		summary:               mountObserveSummary,
    70  		implicitOnCore:        true,
    71  		implicitOnClassic:     true,
    72  		baseDeclarationSlots:  mountObserveBaseDeclarationSlots,
    73  		connectedPlugAppArmor: mountObserveConnectedPlugAppArmor,
    74  		connectedPlugSecComp:  mountObserveConnectedPlugSecComp,
    75  	})
    76  }