On the deployment deploy/README.md documents, source_dir and install_dir are
the same tree and the restart command rebuilds the image from it. The
Dockerfile builds from cmd/ and internal/ and .dockerignore keeps the host
binaries out, so restoring the snapshotted binaries restored bytes nothing
reads. A bad commit therefore cost two health timeouts and two image builds
and ended in ErrRollbackFailed with an instruction to copy files back by hand,
which would not have helped either.
A deployment that rebuilds from source now has to say how the source is put
back. source_rollback "git" records the commit before the update and checks it
back out before the rollback restart. It refuses a dirty tree, because the
recorded commit does not describe one and a forced checkout would delete his
work. A build-from-source config that says nothing is refused by Validate, at
startup, rather than at the one rollback that mattered.
Also in this change, all from the same review:
- MethodPing, the one method a locked daemon answers. Preflight passed on an
unlocked daemon and the post-restart Presence read failed on a locked one,
so a good update read as SHE IS PROBABLY DOWN once the env key is gone.
- A dial failure is reported apart from a read failure. The documented
socket is under /var/lib/docker, which a non-root operator cannot
traverse, and "she is not answering" was the wrong diagnosis.
- Verify refuses to run as root over a tree owned by someone else. It runs
make build and make test in place, and root-owned artifacts break his next
ordinary make.
- A rollback no longer reverts config_files. That undid every config edit
since the last apply, phraser.model_path among them.
- The verify-failure path no longer reports rolled_back for a compile error.
- waitHealthy caps each attempt at the remaining budget, so a 90s timeout
cannot run to 99s.
- tail cuts on a rune boundary. Russian test names showed the seam.
- The claim that mavend does not import internal/update is replaced with
what is enforced: mavend constructs no Updater and nothing can call Apply.
- snapshot_dir inside source_dir is refused. It landed in the build context.
Found in review of #69.
Cold-start unlock wrapped the database key under the credential *public* key.
A public key is public: mavweb writes it verbatim to passkeys.json, normally in
the same state dir as db_key.wrapped, so anyone holding both files recovered the
database key offline with no authenticator involved. The wrapped blob was a
plaintext key with extra steps.
The secret is now the WebAuthn PRF extension output — 32 bytes the authenticator
computes over a fixed salt and never stores anywhere. The blob gains a version:
v2: "MVNKW2\x00" || salt || nonce || AES-256-GCM(key), magic as AAD
v1: salt || nonce || AES-256-GCM(key) (read-only)
v1 still opens so an existing deployment is not bricked, and reports itself so
the daemon can log a SECURITY line telling him to re-enroll. Nothing writes v1.
The magic is authenticated, so a v2 blob cannot be stripped and re-read as v1.
Four other defects on the same path:
- The locked-boot store was opened on an IPC goroutine inside UnlockFn and
never closed. Close is what re-encrypts the tmpfs working copy back over
the ciphertext, so every write of a cold-started session was lost silently
on the next boot. daemonLock now owns the store and seals it at shutdown.
- MethodUnlock was reachable by anything on the box; the socket is same-uid
and cannot authenticate its caller. It now requires a passkey assertion
that mavweb verified first.
- Concurrent unlocks would each open a store and wire a daemon. One at a
time, and never a second one.
- The hand-rolled HKDF keyed the expand step with the salt instead of the
PRK. Replaced with crypto/hkdf.
Key wrapping moves from enrolment to the first assertion, because create() does
not produce a PRF result on most authenticators — only a support flag. An
authenticator without PRF now writes no wrapped file at all rather than one
that looks protected and is not, and the page says so.
Verified: make build, make test. New tests cover the v2 round trip, a wrong
secret, every single-bit tamper, truncation, the v1 downgrade attempt, legacy
v1 reads, non-32-byte and all-zero secrets, the ipc wire field, locked-mode
default-deny, a forged assertion never reaching the unlock path, seal-on-
shutdown after a cold start, and that nothing in the state dir contains the
plaintext key. The PRF round trip against real hardware is a QA step.
Vikunja #14
kami