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shell/window-tracker: Enforce prefix for sandboxed applications

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At least flatpak (no idea about snap, sorry) enforces that all .desktop
files exported by a sandboxed app use the application ID as prefix.

Add the same check when trying to find a match based on the WM_CLASS,
to prevent sandboxed apps from matching a .desktop file they do not
own.

At the moment this is unlikely as we check for a match on the
sandboxed app ID first, but we are about to change that.

https://gitlab.gnome.org/GNOME/gnome-shell/issues/219
This commit is contained in:
Florian Müllner 2020-07-03 16:59:07 +02:00
parent f7dc59e370
commit c79251101d
1 changed files with 16 additions and 4 deletions
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20
src/shell-window-tracker.c
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@ -119,6 +119,16 @@ shell_window_tracker_class_init (ShellWindowTrackerClass *klass)
G_TYPE_NONE, 0);
}
static gboolean
check_app_id_prefix (ShellApp *app,
const char *prefix)
{
if (prefix == NULL)
return TRUE;
return g_str_has_prefix (shell_app_get_id (app), prefix);
}
/*
* get_app_from_window_wmclass:
*
@ -135,8 +145,10 @@ get_app_from_window_wmclass (MetaWindow *window)
ShellAppSystem *appsys;
const char *wm_class;
const char *wm_instance;
const char *sandbox_id;
appsys = shell_app_system_get_default ();
sandbox_id = meta_window_get_sandboxed_app_id (window);
/* Notes on the heuristics used here:
much of the complexity here comes from the desire to support
@ -176,23 +188,23 @@ get_app_from_window_wmclass (MetaWindow *window)
/* first try a match from WM_CLASS (instance part) to StartupWMClass */
wm_instance = meta_window_get_wm_class_instance (window);
app = shell_app_system_lookup_startup_wmclass (appsys, wm_instance);
if (app != NULL)
if (app != NULL && check_app_id_prefix (app, sandbox_id))
return g_object_ref (app);
/* then try a match from WM_CLASS to StartupWMClass */
wm_class = meta_window_get_wm_class (window);
app = shell_app_system_lookup_startup_wmclass (appsys, wm_class);
if (app != NULL)
if (app != NULL && check_app_id_prefix (app, sandbox_id))
return g_object_ref (app);
/* then try a match from WM_CLASS (instance part) to .desktop */
app = shell_app_system_lookup_desktop_wmclass (appsys, wm_instance);
if (app != NULL)
if (app != NULL && check_app_id_prefix (app, sandbox_id))
return g_object_ref (app);
/* finally, try a match from WM_CLASS to .desktop */
app = shell_app_system_lookup_desktop_wmclass (appsys, wm_class);
if (app != NULL)
if (app != NULL && check_app_id_prefix (app, sandbox_id))
return g_object_ref (app);
return NULL;