Mediascanner does not do thumbnailing at all. All of that is done by the thumbnailer library + service. Those should be confined already, but in case they are not, here's the skinny:
- there are two kinds of thumbnails: those created from files and those that are downloaded (album art) - for files, thumbnailer uses the global cache for unconfined apps and app-local dir for confined apps so it should work for everyone - to get album art thumbnails you need to be able to access the dbus service (which I think is available for all applications as it's read only) - the dbus service needs to be able to access the net and write to the cache dir (which it already can do, otherwise no album art would ever show up) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to apparmor-easyprof-ubuntu in Ubuntu. https://bugs.launchpad.net/bugs/1303962 Title: please integrate mediascanner2 and media-hub with apparmor Status in Media Hub: Fix Committed Status in Thumbnail generator for all kinds of files: New Status in “apparmor-easyprof-ubuntu” package in Ubuntu: Fix Released Status in “mediascanner2” package in Ubuntu: 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. To manage notifications about this bug go to: https://bugs.launchpad.net/media-hub/+bug/1303962/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp