Continues the security-review fixes.
Durability and concurrency:
- Vault, config, fingerprint-registry and parent-seed writes are now atomic:
temp file in the same directory, fsync, rename, then an fsync of the
directory. Previously the target was truncated and rewritten in place, so
a crash could destroy the vault.
- The lock now spans the whole read-modify-write cycle, not just the write.
Serializing writes alone still lost changes -- two commands each read the
same index, mutated their copy, and wrote in turn. Every mutating command
goes through mutateVault(), which holds the lock from open to save. A test
runs five concurrent writers and asserts all five entries survive.
- 0600 is now enforced on existing files too: writeFile's mode argument only
applies on creation, so a loosened vault stayed loosened.
- The index is schema-validated before it can reach disk.
Path handling:
- Profile fingerprints are validated (16 uppercase hex) before being used in
any path, and removeProfile additionally checks the resolved directory
still sits directly under the app directory. A tampered registry could
otherwise have steered a recursive delete elsewhere.
- Malformed entries in fingerprints.json are dropped on read.
Restore semantics:
- `nostr restore` merges remote state into the local vault instead of
replacing it. Replacing silently discarded entries created since the last
sync; that now requires --replace --yes, and any overwritten vault is
copied aside first.
- Deltas are bound to the manifest they extend (filtered on the e tag, and
re-checked locally), so a relay cannot replay a validly-signed delta from
another snapshot lineage into a restore.
- Manifest selection breaks created_at ties by relay order, so a same-second
republish cannot leave a restore on a stale snapshot.
- mergeIndexPayloads gained an index0 option. The default still refuses to
merge populated Python atlas state rather than drop it; restore uses
preserve-current, keeping the local block verbatim, because Python
recomputes canonical views on load and the default would block every
restore into a Python-created profile.
193 core + 69 CLI tests green; 36/36 cross-implementation checks green.
Co-Authored-By: Claude Fable 5 <[email protected]>
