Used impersonation token ids were only remembered in process memory, so
a captured handoff link could be redeemed a second time within its five
minute lifetime once the process restarted, or on another replica. Each
used id now also leaves a marker file in the state directory, created
exclusively, which every replica sharing the state volume sees; markers
are pruned once the token could no longer verify.
The absolute session limit comes from the eight-hour app password that
Stalwart itself expires.
An impersonation handoff sealed `<target>%<master>` and the master
password into the session cookie, and `PUT /api/auth/session` hands that
cookie's contents to the browser on every restore. Anyone who received
a handoff could read a credential that signs in as every mailbox and
into Stalwart administration, with no expiry and no audit trail.
The impersonate route now uses the master credential server-side, once,
to create an app password on the target mailbox that expires after
8 hours. Only that app password reaches the cookies. Signing out
revokes it through a sealed grant cookie, and PUT refuses any session
that still holds the configured master password, so cookies minted
before this change are dropped instead of returned.
After a master-user impersonation handoff (GET /api/auth/impersonate) the server
swaps the slot-0 session cookie but the client's persisted account registry
(account-registry / auth-storage in localStorage) still lists the previous
account, so the top-left account chip keeps showing the old mailbox until a
manual sign-out. Redirect impersonation to /?impersonated=1 and add a headless
ImpersonationReconciler that drops the stale persisted account/auth state (and
server-derived caches) then reloads to a clean URL, so the app rehydrates empty
and re-derives the single account from the fresh session. Cookies untouched, so
the just-granted session survives. Runs exactly once.
Reported downstream: shukiv/jabali-panel#646.
Linus Rath
shukiv