/resume resolved a persisted session id/title with no ownership check on any
adapter except Matrix, so an authorized caller could bind their gateway session
to another user's/room's transcript and read it. The titled-session listing and
numeric index were also globally enumerable on non-Matrix platforms, exposing
the ids and previews needed to target the IDOR.
Generalize the Matrix-only room guard to an adapter-agnostic ownership check
(live origin when active; DB row source + user_id for persisted-only sessions,
the only fields available), applied to the direct-id/title path and the
listing/numeric paths on every platform. An explicit admin --all override is
honored. The Matrix path is preserved unchanged.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
claudlos
c4f278c021