[tor-bugs] #28705 [Applications/Tor Browser]: Don't leak File URI during download on Android

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#28705: Don't leak File URI during download on Android
-------------------------------------+-------------------------------------
     Reporter:  sysrqb               |      Owner:  tbb-team
         Type:  defect               |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-mobile,
     Severity:  Normal               |  TorBrowserTeam201812
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:  Sponsor8             |
-------------------------------------+-------------------------------------
 This is already patched upstream in FF62, but the backport is not-small.
 Maybe we can get away with a smaller patch that solves the main problem.

 Summary:
 In #27701 we solved the bug where torbutton prevents downloading a file on
 Android.
 In #28051 we solved the problem where notifications weren't working on
 newer versions of Android.

 Now we have a problem that on newer versions of Android, the runtime
 prevents "leaking" file URIs from one app to another. In particular, this
 is happening when Tor Browser is downloading a file, the browser creates a
 notification with the URI of the local destination file embedded in it.

 This results in an exception stacktrace like:
 {{{
 D AndroidRuntime: Shutting down VM
 E AndroidRuntime: FATAL EXCEPTION: main
 E AndroidRuntime: Process: org.torproject.torbrowser_alpha, PID: 18167
 E AndroidRuntime: android.os.FileUriExposedException:
 file:///storage/emulated/0/Download/tor-browser-8.5a5-android-armv7.apk
 exposed beyond app through Intent.getData()
 E AndroidRuntime:        at
 android.os.StrictMode.onFileUriExposed(StrictMode.java:1960)
 E AndroidRuntime:        at
 android.net.Uri.checkFileUriExposed(Uri.java:2356)
 E AndroidRuntime:        at
 android.content.Intent.prepareToLeaveProcess(Intent.java:9881)
 E AndroidRuntime:        at
 android.content.Intent.prepareToLeaveProcess(Intent.java:9835)
 E AndroidRuntime:        at
 android.app.PendingIntent.getActivity(PendingIntent.java:342)
 E AndroidRuntime:        at
 android.app.PendingIntent.getActivity(PendingIntent.java:304)
 E AndroidRuntime:        at
 org.mozilla.gecko.notifications.NotificationHelper.showNotification(NotificationHelper.java:298)
 E AndroidRuntime:        at
 org.mozilla.gecko.notifications.NotificationHelper.handleMessage(NotificationHelper.java:120)
 E AndroidRuntime:        at
 org.mozilla.gecko.EventDispatcher$2.run(EventDispatcher.java:337)
 E AndroidRuntime:        at
 android.os.Handler.handleCallback(Handler.java:790)
 E AndroidRuntime:        at
 android.os.Handler.dispatchMessage(Handler.java:99)
 E AndroidRuntime:        at android.os.Looper.loop(Looper.java:164)
 E AndroidRuntime:        at
 android.app.ActivityThread.main(ActivityThread.java:6494)
 E AndroidRuntime:        at java.lang.reflect.Method.invoke(Native Method)
 E AndroidRuntime:        at
 com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
 E AndroidRuntime:        at
 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
 }}}

 This was patched upstream:
 https://bugzilla.mozilla.org/show_bug.cgi?id=1450449

 Crash report:
 https://bugzilla.mozilla.org/show_bug.cgi?id=1476681

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28705>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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