Minstrel keeps credentials it has to read back: indexer, Prowlarr and
download-client keys and passwords, the AcoustID key, cover-art and tag
provider keys, the SMTP password, and each user's ListenBrainz token and
Subsonic password. They were stored in the clear; they are now sealed with
AES-256-GCM under a per-column HKDF key derived from the stream secret, each
value bound to its row.
- internal/secret: Seal/Open/Reveal, and Columns, the one list of sealed
columns (a backup will leave them out). Install takes the master key at
startup; SealStored seals any value still in the clear, so an existing
database is brought over in place on the first boot.
- Every write seals and every read opens: acquire (one read path, getService
/ usableServices), acoustid settings, SMTP, ListenBrainz, Subsonic auth and
password generation, cover-art and tag provider settings.
- A value that does not open (the stream secret changed) is logged and reads
as unset, to be entered again in Settings. docs/security.md says so.
- Tests: secret unit tests (wrong owner/purpose/key, malformed, no key), a
SealStored integration test over all eight columns plus a schema check that
each listed column exists, and the existing tests now assert sealed storage.
dbtest installs a test key for integration tests.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
