Public bug reported: # Bug report: transmission-gtk AppArmor blocks xdg-desktop-portal FileChooser
**Title:** transmission-gtk: missing xdg-desktop-portal FileChooser rules block "Open File" dialog **Where to file:** - Launchpad (preferred): `ubuntu-bug apparmor`, or https://bugs.launchpad.net/ubuntu/+source/apparmor/+filebug - Upstream: https://gitlab.com/apparmor/apparmor/-/issues - Mailing list: [email protected] --- The AppArmor profile for transmission (abstractions/transmission-common, shipped in the apparmor package) is missing the xdg-desktop-portal FileChooser rules. With the transmission-gtk profile in enforce mode, clicking File -> Open does nothing: the file chooser window never appears. ## Environment - Ubuntu 26.04 (development) - apparmor 5.0.0~beta1-0ubuntu7 - transmission-gtk / transmission-common 4.1.1+dfsg-1ubuntu1.1 - xdg-desktop-portal 1.21.1+ds-1ubuntu3 (backends: -gnome, -gtk) ## Analysis transmission 4.x uses GtkFileChooserNative, which routes the dialog through xdg-desktop-portal (org.freedesktop.portal.FileChooser) on the session bus. The dialog is drawn by the unconfined portal process, so no window appears when the D-Bus call is denied. abstractions/transmission-common already carries partial portal rules (Properties.Get, portal.Settings.ReadAll, portal.Inhibit.CreateMonitor, a11y.Bus.GetAddress) but NOT the FileChooser portal, so OpenFile is blocked. The denial is NOT in dmesg; it is emitted by the session dbus-daemon and only appears in the journal: dbus-daemon: apparmor="DENIED" operation="dbus_method_call" bus="session" path="/org/freedesktop/portal/desktop" interface="org.freedesktop.portal.FileChooser" member="OpenFile" mask="send" name="org.freedesktop.portal.Desktop" label="transmission-gtk" Additional related denials during the same action: - org.freedesktop.DBus.Properties.GetAll on the portal (only Get is allowed) - org.freedesktop.host.portal.Registry.Register - org.freedesktop.portal.Session.Close - receive of org.freedesktop.portal.Request.Response signals - org.a11y.atspi.Registry events on the accessibility bus (only a11y.Bus.GetAddress allowed) ## Steps to reproduce 1. Ensure the transmission-gtk profile is loaded in enforce mode. 2. Launch transmission-gtk. 3. Click File -> Open. - Expected: the file chooser dialog appears. - Actual: nothing happens; journal shows the DENIED entry above. Distinct from LP #2137395 (transmission-gtk failing to own its D-Bus name, Fix Released in apparmor 5.0.0~beta1-0ubuntu5), which added some portal integration but did not cover the FileChooser path. ## Proposed fix — add to abstractions/transmission-common dbus (send) bus=session path=/org/freedesktop/portal/desktop interface=org.freedesktop.portal.FileChooser peer=(name=org.freedesktop.portal.Desktop), dbus (send) bus=session path=/org/freedesktop/portal/desktop interface=org.freedesktop.DBus.Properties member=GetAll peer=(name=org.freedesktop.portal.Desktop), dbus (send) bus=session path=/org/freedesktop/portal/desktop interface=org.freedesktop.portal.Session member=Close peer=(name=org.freedesktop.portal.Desktop), dbus (receive) bus=session path=/org/freedesktop/portal/desktop/request/** interface=org.freedesktop.portal.Request member=Response, Allowing the atspi accessibility bus events would additionally silence the remaining a11y denials. ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: apparmor 5.0.0~beta1-0ubuntu7 ProcVersionSignature: Ubuntu 7.0.0-27.27-generic 7.0.6 Uname: Linux 7.0.0-27-generic x86_64 ApportVersion: 2.34.0-0ubuntu2 Architecture: amd64 CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Wed Jul 8 01:59:06 2026 InstallationDate: Installed on 2026-03-21 (108 days ago) InstallationMedia: Ubuntu 25.10 "Questing Quokka" - Release amd64 (20251007) ProcEnviron: LANG=ru_RU.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=xterm-256color XDG_RUNTIME_DIR=<set> ProcKernelCmdline: BOOT_IMAGE=/boot/vmlinuz-7.0.0-27-generic root=UUID=a6c9f75c-697a-4c87-bf33-5f8a50341f57 ro quiet splash crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M SourcePackage: apparmor UpgradeStatus: Upgraded to resolute on 2026-05-16 (52 days ago) ** Affects: apparmor (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug resolute wayland-session -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2160078 Title: transmission-gtk: missing xdg-desktop-portal FileChooser rules block "Open File" dialog To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apparmor/+bug/2160078/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
