Marc-André Bombeck
a8b0365ca5
fix(auth): carry a generated secret in the session cookie, not the row id
...
The cookie was the Session row's cuid. cuid is built for collision-
resistant identity across distributed writers, not for unguessability —
it encodes a millisecond timestamp and a process-local counter and never
touches a CSPRNG. A session cookie is a bearer credential and has to be
unguessable, so it now carries 32 random bytes and only the HMAC of that
value is stored, matching how api_tokens and refresh_tokens already hold
their secrets.
Compatibility is passive, and deliberately so. A backfill cannot help:
the cookie already sitting in a browser is the cuid, and nothing we
generate server-side can be pushed into it — backfilling would sign
everyone out at deploy. Upgrading a row in place on first use loses to
the parallel requests a single page load fires: each mints its own
secret, one write wins, and the losers cannot re-emit the winner's
secret because only a hash is stored, so the browser can end up holding
a value the row does not honour. Instead, rows minted before the column
keep a NULL token_hash and stay resolvable by id, and are denied the
sliding-expiry extension so they drain within the 30-day session
lifetime. Every login from this release forward is on a secret at once,
and an id stops authenticating the moment its row holds one.
Note for operators: API_TOKEN_HMAC_KEY now also keys session cookies, so
rotating it signs browser sessions out as well as invalidating tokens.
It is already Core-required, so no deployment gains a new prerequisite.
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