** Also affects: media-hub (Ubuntu)
Importance: Undecided
Status: New
** Changed in: media-hub (Ubuntu)
Status: New => Fix Released
** Also affects: media-hub (Ubuntu RTM)
Importance: Undecided
Status: New
** No longer affects: media-hub
** Changed in: media-hub (Ubuntu RTM)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1303962
Title:
please integrate mediascanner2 and media-hub with apparmor
Status in Thumbnailer:
Fix Released
Status in apparmor-easyprof-ubuntu package in Ubuntu:
Fix Released
Status in media-hub package in Ubuntu:
Fix Released
Status in mediascanner2 package in Ubuntu:
Fix Released
Status in media-hub package in Ubuntu RTM:
Fix Released
Bug description:
media-hub and mediascanner are separate processes from apps and are
used to play and scan music and video files respectively. Up until
now, apps would have to use the music_files_read or video_files_read
reserved policy groups to access media. The problem is, these policy
groups are reserved and not available to normal AppStore apps in order
to prevent information leaks (this user has this video installed) and
theft (can access the music and video directly). The path forward is
that media-hub and mediascanner are helpers that apps can use and they
should integrate with the trust store.
AppStore apps:
1. should be able to access their own content (installed or local)
2. should not be able to access, play or otherwise enumerate other apps'
media (ie, app 'foo' should not be able to play the facebook app's sound file
3. AppStore apps should be able to enumerate the global music (~/Music) and
video (~/Video) library via the mediascanner helper with permission from the
user
4. AppStore apps should be able to play the global music (~/Music) and video
(~/Video) library via the media-hub with permission from the user
5. AppStore apps should be able to have access to media files with
permission from the user. This is already handled by the content-hub paradigm
(though someone would need to add a media content provider for the content-hub
to have this work)
Both media-hub and mediascanner should do something like the below
pseudo code:
# see 'man aa_getcon()' from libapparmor-dev for more info
# conn_name is the unique D-Bus connection name of the application connecting
# to media-hub/mediascanner
apparmor_profile =
org.freedesktop.DBus.GetConnectionAppArmorSecurityContext(conn_name)
pkgname = apparmor_profile.split('_')[0]
if apparmor_profile == unconfined: # unconfined apps can access all the files
allow access
elif playback_file in ~/.local/share/$pkgname/... or playback_file in
~/.cache/$pkgname/..: # apps can access their own files
allow access
elif $pkgname can access playback_file in trust store: # apps can access the
files if user said so previously
allow access
elif playback_file in ~/Music:
answer = prompt user for access to global music files
if $answer == yes
update trust store for $pkgname can enumerate/play ~/Music
allow access
else:
deny access
elif playback_file in ~/Videos:
answer = prompt user for access to global video files
if $answer == yes
update trust store for $pkgname can enumerate/play ~/Videos
allow access
else:
deny access
else:
deny access
To have the best user experience and prevent multiple prompting,
mediascanner and media-hub should use the same trust store database.
I'm not sure that mediascanner2 offers a DBus API for enumerating
global media files yet or not (music-app seems to be accessing files
in ~/.cache/media-art/ and ~/.cache/mediascanner directly).
UPDATE: 2014-05-02
media-hub implemented '1' and '2' already (can access its own data, but not
other apps' data) and was marked Fix Released. Trust store integration ('3' and
'4') is now being tracked in bug #1315381.
mediascanner2 still needs to implement '1' and '2'. The 'audio' and
'video' policy groups will *not* add this access at this time.
Instead, apps can use 'read_path' as part of their policy to have
access to the mediascanner files. This is workable for the music app,
but will block other apps from inclusion in the app store.
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