Three bugs surfaced by actually running the SSH e2e suite
(KANDEV_E2E_CONTAINERS=1 against the containers project):
1. Alpine's `adduser -D kandev` leaves the account password-locked
(`!` in /etc/shadow). sshd then refuses every auth method for that
user — including pubkey — with "User kandev not allowed because
account is locked". Fix: `usermod -p '*' kandev` in the Dockerfile
so the account is open for key-based login but still has no valid
password. Also adds the `shadow` apk package for `usermod`.
2. ssh-keyscan reports the ed25519 host fingerprint, but Go's ssh
client may negotiate a different host key type when sshd offers
multiple — meaning the fingerprint the fixture pre-scanned didn't
match the one kandev observed at handshake time. Fix: the fixture
now hits /api/v1/ssh/test with a permissive callback right after
the container is up and uses that fingerprint as the pinned value.
Same code path real users hit; eliminates the negotiation skew by
construction.
3. ssh.ts had a CPU-spin sleep helper and an nc-dependent TCP probe,
both fragile. Replaced with a proper sleep subprocess and a bash
/dev/tcp probe, plus retry-with-stderr on the fingerprint scan so
failures are diagnosable.
Also tightens test-endpoint.spec.ts F4: the test was using
identity_source=agent to "fail fast", but that fails inside
buildAuthMethods before the handshake step ever runs. Switched to
identity_source=file against a refused port so the test exercises
the actual TCP+handshake failure path.
After these fixes 4/6 test-endpoint cases pass against a real sshd.
José Almeida
192df0ecf3