Public bug reported:
Tested on Ubuntu 26.10, XPS 13 (9350)
Relevant packages installed:
- apparmor 6.0.0~alpha1-0ubuntu4
- loupe 50.0-0ubuntu2
On Ubuntu 26.10, dropping an image file (e.g. from Files) onto a Loupe
window does nothing. The drop highlight appears, but no image is opened.
It is found that the new loupe profile includes abstractions/dbus-
xdg/portal-file-transfer. That abstraction allows the
org.freedesktop.portal.FileTransfer methods only on the object path
/org/freedesktop/portal/desktop. However, FileTransfer is implemented by
xdg-document-portal (bus name org.freedesktop.portal.Documents) on the
path /org/freedesktop/portal/documents. GTK 4 calls RetrieveFiles there
when it receives a drop, so the call is denied and GTK discards the drop
data.
Steps to reproduce:
-------------------
1. Open Loupe on its own (ie. without an image).
2. Drag an image file from Files onto the Loupe window and drop it.
Expected: the image opens.
Actual: nothing happens.
Loupe's stderr:
Gtk-WARNING **: Failed to receive drop data:
GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: Sender is not authorized
to send message
Workaround / suggested fix:
----------------------------
Allow the same rules on the documents path. Adding this file through the
abstraction's existing include directory, as
/etc/apparmor.d/abstractions/dbus-xdg/portal-file-transfer.d/documents-path,
and reloading the profile makes drag-and-drop work:
dbus send
bus=session
path=/org/freedesktop/portal/documents
interface=org.freedesktop.portal.FileTransfer
member={StartTransfer,AddFiles,RetrieveFiles,StopTransfer},
dbus receive
bus=session
path=/org/freedesktop/portal/documents
interface=org.freedesktop.portal.FileTransfer
member=TransferClosed,
The abstraction itself should probably use
path=/org/freedesktop/portal/documents, or allow both paths.
** Affects: apparmor (Ubuntu)
Importance: Undecided
Status: New
** Affects: loupe (Ubuntu)
Importance: Undecided
Status: New
** Summary changed:
- portal-file-transfer abstraction allows FileTransfer on the wrong object path
- Loupe drag-and-drop breaks
+ Loupe drag-and-drop breaks due to AppArmor allowing FileTransfer on the wrong
path
** Also affects: loupe (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2171366
Title:
Loupe drag-and-drop breaks due to AppArmor allowing FileTransfer on
the wrong path
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