** Tags added: patch
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https://bugs.launchpad.net/bugs/1218107
Title:
hud should use APP_ID and libnih to generate the DBus path
Status in “hud” package in Ubuntu:
Triaged
Status in “hud” source package in Saucy:
Triaged
Bug description:
We discussed DBus APIs in relation to application confinement in various
places and decided that services that require DBus mediation, click packaging
and apparmor should all agree on how to derive an application-specific DBus
path. The concept of the APP_ID is central to click, the SDK, application
lifecycle, apparmor and DBus services that applications use. The APP_ID is of
the form:
$pkgname_$appname_$version
and this is derived from the click manifest. Eg:
com.ubuntu.dropping-letters_dropping-letters_0.1.2.2
Application lifecycle will export the APP_ID to the environment. The
click-apparmor hook creates the @{APP_ID_DBUS} variable in apparmor policy for
use in dbus rules. click-apparmor uses nih_dbus_path() from libnih-dbus to
generate the @{APP_ID_DBUS}. Eg, for
com.ubuntu.dropping-letters_dropping-letters_0.1.2.2, we would have:
@{APP_ID_DBUS}="com_2eubuntu_2edropping_2dletters_5fdropping_2dletters_5f0_2e1_2e2_2e2"
This allows us to have rules like this in apparmor policy:
dbus (send)
bus=session
path="/com/canonical/hud/applications/@{APP_ID_DBUS}",
However, the HUD is generating a different value for its path, as seen in
this dbus apparmor denial:
dbus[3390]: apparmor="DENIED" operation="dbus_method_call" bus="session"
name=":1.641"
path="/com/canonical/hud/applications/com_ubuntu_dropping_letters_dropping_letters_0_1_2_2"
interface="org.freedesktop.DBus.Properties" member="GetAll" mask="send"
pid=23875 profile="com.ubuntu.dropping-letters_dropping-letters_0.1.2.2"
peer_pid=22913 peer_profile="unconfined"
We need the hud and apparmor to agree, otherwise we have to use policy
that's much too lenient where malicious applications can interfere
with other apps. Please adjust the hud to use libnih-dbus. Attached is
a test C program to demonstrate how to do this.
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