# vim:syntax=apparmor

# papers is not written with application confinement in mind and is designed to
# operate within a trusted desktop session where anything running within the
# user's session is trusted. That said, papers will often process untrusted
# input (PDFs, images, etc). Ideally papers would be written in such a way that
# image processing is separate from the main process and that processing
# happens in a restrictive sandbox, but unfortunately that is not currently the
# case. Because papers will process untrusted input, this profile aims to
# provide some hardening, but considering papers's design and other factors such
# as X, gsettings, accessibility, translations, DBus session and system
# services, etc, complete confinement is not possible.

include <tunables/global>

/usr/bin/papers {
  include <abstractions/audio>
  include <abstractions/bash>
  include <abstractions/cups-client>
  include <abstractions/dbus-accessibility>
  include <abstractions/papers>
  include <abstractions/ibus>
  include <abstractions/nameservice>

  include <abstractions/ubuntu-browsers>
  include <abstractions/ubuntu-console-browsers>
  include <abstractions/ubuntu-email>
  include <abstractions/ubuntu-console-email>
  include <abstractions/ubuntu-media-players>

  # allow papers to spawn browsers distributed as snaps (LP: #1794064)
  include if exists <abstractions/snap_browsers>

  # For now, let papers talk to any session services over dbus. We can
  # blacklist any problematic ones (but note, papers uses libsecret :\)
  include <abstractions/dbus-session>

  include <abstractions/dbus-strict>
  dbus (receive) bus=system,
  # Allow getting information from various system services
  dbus (send)
      bus=system
      member="Get*"
      peer=(label=unconfined),
  # Allow talking to avahi with whatever polkit allows
  dbus (send)
      bus=system
      interface="org.freedesktop.Avahi{,.*}",
  # Allow talking to colord with whatever polkit allows
  dbus (send)
      bus=system
      interface="org.freedesktop.ColorManager{,.*}",

  # Terminals for using console applications. These abstractions should ideally
  # have 'ix' to restrict access to what only papers is allowed to do
  include <abstractions/ubuntu-gnome-terminal>

  # By default, we won't support launching a terminal program in Xterm or
  # KDE's konsole. It opens up too many unnecessary files for most users.
  # People who need this functionality can uncomment the following:
  ##include <abstractions/ubuntu-xterm>
  ##include <abstractions/ubuntu-konsole>

  /usr/bin/papers rmPx,
  /usr/bin/papers-previewer Px,
  /usr/bin/yelp Cx -> sanitized_helper,
  /usr/bin/bug-buddy px,
  # 'Show Containing Folder' (LP: #1022962)
  /usr/bin/nautilus Cx -> sanitized_helper, # Gnome
  /usr/bin/pcmanfm Cx -> sanitized_helper,  # LXDE
  /usr/bin/krusader Cx -> sanitized_helper, # KDE
  /usr/bin/thunar Cx -> sanitized_helper,   # XFCE

  # Print Dialog
  /usr/lib/@{multiarch}/libproxy/*/pxgsettings Cx -> sanitized_helper,

  # For Xubuntu to launch the browser
  include <abstractions/exo-open>

  # For text attachments
  /usr/bin/gedit ixr,

  # For Send to
  /usr/bin/nautilus-sendto Cx -> sanitized_helper,

  # GLib desktop launch helper (used under the hood by g_app_info_launch)
  /usr/lib/@{multiarch}/glib-[0-9]*/gio-launch-desktop rmix,
  /usr/bin/env ixr,

  # allow directory listings (ie 'r' on directories) so browsing via the file
  # dialog works
  / r,
  /**/ r,

  # This is need for saving files in your home directory without an extension.
  # Changing this to '@{HOME}/** r' makes it require an extension and more
  # secure (but with 'rw', we still have abstractions/private-files-strict in
  # effect).
  owner @{HOME}/** rw,
  owner /media/**  rw,
  owner @{HOME}/.local/share/gvfs-metadata/** l,
  owner /{,var/}run/user/*/gvfs-metadata/** l,

  owner @{HOME}/.gnome2/papers/*       rwl,
  owner @{HOME}/.gnome2/accels/        rw,
  owner @{HOME}/.gnome2/accelspapers   rw,
  owner @{HOME}/.gnome2/accels/papers  rw,

  # Maybe add to an abstraction?
  /etc/dconf/**                                       r,
  owner @{HOME}/.cache/dconf/user                     rw,
  owner @{HOME}/.config/dconf/user                    r,
  owner @{HOME}/.config/enchant/*                     rk,
  owner /{,var/}run/user/*/dconf/                     w,
  owner /{,var/}run/user/*/dconf/user                 rw,
  owner /{,var/}run/user/*/dconf-service/keyfile/     w,
  owner /{,var/}run/user/*/dconf-service/keyfile/user rw,

  owner /{,var/}run/user/*/at-spi2-*/   rw,
  owner /{,var/}run/user/*/at-spi2-*/** rw,

  # Allow access to the non-abstract D-Bus socket used by at-spi > 2.42.0
  #   https://gitlab.gnome.org/GNOME/at-spi2-core/-/issues/43
  owner /{,var/}run/user/*/at-spi/bus* rw,

  # from http://live.gnome.org/Evince/SupportedDocumentFormats. Allow
  # read and write for all supported file formats
  /**.[aA][iI]         rw,
  /**.[bB][mM][pP]     rw,
  /**.[dD][jJ][vV][uU] rw,
  /**.[dD][vV][iI]     rw,
  /**.[gG][iI][fF]     rw,
  /**.[jJ][pP][gG]     rw,
  /**.[jJ][pP][eE][gG] rw,
  /**.[oO][dD][pP]     rw,
  /**.[fFpP][dD][fF]   rw,
  /**.[pP][nN][mM]     rw,
  /**.[pP][nN][gG]     rw,
  /**.[pP][sS]         rw,
  /**.[eE][pP][sS]     rw,
  /**.[tT][iI][fF]     rw,
  /**.[tT][iI][fF][fF] rw,
  /**.[xX][pP][mM]     rw,
  /**.[gG][zZ]         rw,
  /**.[bB][zZ]2        rw,
  /**.[cC][bB][rRzZ7]  rw,
  /**.[xX][zZ]         rw,

  # papers creates a temporary stream file like '.goutputstream-XXXXXX' in the
  # directory a file is saved. This allows that behavior.
  owner /**/.goutputstream-* w,

  # allow papers to spawn browsers distributed as snaps (LP: #1794064)
  /{,snap/core/[0-9]*/,snap/snapd/[0-9]*/}usr/bin/snap mrCx -> snap_browsers,
}

/usr/bin/papers-previewer {
  include <abstractions/audio>
  include <abstractions/bash>
  include <abstractions/cups-client>
  include <abstractions/dbus-accessibility>
  include <abstractions/papers>
  include <abstractions/ibus>
  include <abstractions/nameservice>

  include <abstractions/ubuntu-browsers>
  include <abstractions/ubuntu-console-browsers>
  include <abstractions/ubuntu-email>
  include <abstractions/ubuntu-console-email>
  include <abstractions/ubuntu-media-players>

  # For now, let papers talk to any session services over dbus. We can
  # blacklist any problematic ones (but note, papers uses libsecret :\)
  include <abstractions/dbus-session>

  include <abstractions/dbus-strict>
  dbus (receive) bus=system,
  # Allow getting information from various system services
  dbus (send)
      bus=system
      member="Get*"
      peer=(label=unconfined),
  # Allow talking to avahi with whatever polkit allows
  dbus (send)
      bus=system
      interface="org.freedesktop.Avahi{,.*}",
  # Allow talking to colord with whatever polkit allows
  dbus (send)
      bus=system
      interface="org.freedesktop.ColorManager{,.*}",


  # Terminals for using console applications. These abstractions should ideally
  # have 'ix' to restrict access to what only papers is allowed to do
  include <abstractions/ubuntu-gnome-terminal>

  # By default, we won't support launching a terminal program in Xterm or
  # KDE's konsole. It opens up too many unnecessary files for most users.
  # People who need this functionality can uncomment the following:
  #include <abstractions/ubuntu-xterm>

  /usr/bin/papers-previewer mr,
  /usr/bin/yelp Cx -> sanitized_helper,
  /usr/bin/bug-buddy px,

  # Lenient, but remember we still have abstractions/private-files-strict in
  # effect). Write is needed for 'print to file' from the previewer.
  @{HOME}/ r,
  @{HOME}/** rw,

  # Maybe add to an abstraction?
  owner /{,var/}run/user/*/dconf/          w,
  owner /{,var/}run/user/*/dconf/user      rw,
}

/usr/bin/papers-thumbnailer {
  include <abstractions/base>
  include <abstractions/private-files-strict>

  include <abstractions/fonts>
  deny @{HOME}/.{,cache/}fontconfig/** wl,
  deny @{HOME}/missfont.log wl,

  include <abstractions/dbus-session-strict>
  dbus (receive) bus=session,
  dbus (send)
    bus=session
    path="/org/gtk/vfs/mounttracker"
    interface="org.gtk.vfs.MountTracker"
    member="ListMountableInfo"
    peer=(label=unconfined),

  # updating gvfs-metadata for thumbnails is unneeded, so explicitly deny it
  deny dbus (send)
    bus=session
    path="/org/gtk/vfs/metadata"
    interface="org.gtk.vfs.Metadata"
    member="GetTreeFromDevice"
    peer=(label=unconfined),
  deny @{HOME}/.local/share/gvfs-metadata/* r,

  dbus (send)
    bus=session
    path="/org/gtk/vfs/Daemon"
    interface="org.gtk.vfs.Daemon"
    member="List*"
    peer=(label=unconfined),

  # The thumbnailer doesn't need access to everything in the nameservice
  # abstraction. Allow reading of /etc/passwd and /etc/group, but suppress
  # logging denial of nsswitch.conf.
  /etc/passwd r,
  /etc/group r,
  deny /etc/nsswitch.conf r,

  # TCP/UDP network access for NFS
  network inet  stream,
  network inet6 stream,
  network inet  dgram,
  network inet6 dgram,

  /etc/papersize r,

  /usr/bin/papers-thumbnailer mr,

  /etc/texmf/ r,
  /etc/texmf/** r,
  /etc/xpdf/* r,

  /usr/bin/gs-esp ixr,
  # Silence these denials since 'no new privs' drops transitions to
  # sanitized_helper, we don't want all those perms in the thumbnailer
  # and the thumbnailer generates thumbnails without these just fine.
  deny /usr/bin/mktexpk x,
  deny /usr/bin/mktextfm x,
  deny /usr/bin/dvipdfm x,
  deny /usr/bin/dvipdfmx x,
  deny /usr/bin/mkofm x,

  # supported archivers
  /{usr/,}bin/gzip ixr,
  /{usr/,}bin/bzip2 ixr,
  /usr/bin/unrar* ixr,
  /usr/bin/unzip ixr,
  /usr/bin/7zr ixr,
  /usr/lib/p7zip/7zr ixr,
  /usr/bin/7za ixr,
  /usr/lib/p7zip/7za ixr,
  /usr/bin/zipnote ixr,
  /{usr/,}bin/tar ixr,
  /usr/bin/xz ixr,

  # miscellaneous access for the above
  owner @{PROC}/@{pid}/fd/ r,
  owner @{PROC}/@{pid}/mountinfo r,
  /sys/devices/system/cpu/ r,

  # allow read access to anything in /usr/share, for plugins and input methods
  /usr/local/share/** r,
  /usr/share/** r,
  /usr/lib/ghostscript/** mr,
  /var/lib/ghostscript/** r,
  /var/lib/texmf/** r,

  # from http://live.gnome.org/Evince/SupportedDocumentFormats. Allow
  # read for all supported file formats
  /**.[bB][mM][pP]     r,
  /**.[dD][jJ][vV][uU] r,
  /**.[dD][vV][iI]     r,
  /**.[gG][iI][fF]     r,
  /**.[jJ][pP][gG]     r,
  /**.[jJ][pP][eE][gG] r,
  /**.[oO][dD][pP]     r,
  /**.[fFpP][dD][fF]   r,
  /**.[pP][nN][mM]     r,
  /**.[pP][nN][gG]     r,
  /**.[pP][sS]         r,
  /**.[eE][pP][sS]     r,
  /**.[eE][pP][sS][fFiI23] r,
  /**.[tT][iI][fF]     r,
  /**.[tT][iI][fF][fF] r,
  /**.[xX][pP][mM]     r,
  /**.[gG][zZ]         r,
  /**.[bB][zZ]2        r,
  /**.[cC][bB][rRtTzZ7]  r,
  /**.[xX][zZ]         r,

  owner @{HOME}/.texlive*/** r,
  owner @{HOME}/.texmf*/** r,
  owner @{HOME}/.local/share/{,flatpak/exports/share/}mime/** r,
  owner @{HOME}/.local/share/{,flatpak/exports/share/}mime/** r,

  # With the network rules above, this allows data exfiltration for files
  # not covered by private-files-strict.
  @{HOME}/ r,
  owner @{HOME}/[^.]** r,
  owner /media/**  r,

  owner /tmp/.gnome_desktop_thumbnail* w,
  owner /tmp/gnome-desktop-* rw,
  owner /tmp/evince-thumbnailer*/{,**} rw,
  
  # these happen post pivot_root
  / r,
  deny /missfont.log w,

  # Site-specific additions and overrides. See local/README for details.
  include <local/usr.bin.papers>
}