62c95f8c2f
2 Commits
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jx12n
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62c95f8c2f |
docs, ops scripts, and the MCP install
Written after the service was live, so every command and every number here was
run against the real deployment rather than assumed:
* DEPLOY.md records the things a rebuild needs and git does not hold — the
Redis ACL user (and why +getdel is the one to notice), the GCP Secret
Manager entry, the DNS record, and the three coordinated edits vmalert
needs because it has no ConfigMap auto-discovery.
* It also records two blockers rather than hiding them: Woodpecker is NOT
activated (the token in rdev-credentials returns 401), so pushes do not
deploy yet and the Kaniko Job is the interim path; and the host is
hush.threesix.ai rather than hush.orchard9.ai because orchard9.ai is on
GoDaddy and no GoDaddy credential exists anywhere I can reach.
* OPERATIONS.md is one section per alert, plus the failure modes that are not
alerts — chiefly that "gone" cannot distinguish already-revealed from
expired from LRU-evicted, on purpose, so the operator's default reading of
an unexpected "gone" is that the secret is compromised and should be
rotated.
* scripts/logs.sh and alerts-check.sh verify rather than assert:
alerts-check asks vmalert what it actually loaded AND checks each rule's
series exists, because a rule reading a metric nothing exports can never
fire and looks exactly like a healthy service.
* scripts/smoke.sh is a real client — it generates a key, encrypts, posts only
ciphertext, reveals, decrypts, then asserts the second reveal is 410, that
three GETs did not consume the secret, that missing and malformed ids are
indistinguishable, and that a plaintext field is refused.
install-mcp.sh proves the MCP handshake before writing any config, backs up
mcp.json, and rewrites only hush's entry — a config pointing at a broken server
surfaces as an opaque host-side connect failure, which is worth one extra check
to avoid.
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jx12n
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4d9a26498e |
hush: one-time secret links the server cannot read
Paste a secret, get a link, send it. The first person to open it and press
Reveal sees the secret; the link dies at that moment. The recipient needs a
browser and nothing else — no account, no client, no installed tooling.
The server cannot read what it stores. AES-256-GCM happens in the browser and
the key lives in the URL fragment, which browsers never transmit, so hushd
holds ciphertext and no key material. That is a property of where the key sits
rather than a promise about our conduct, which is why there is deliberately no
endpoint accepting a plaintext secret and no server-side-encryption fallback:
two guarantees behind one URL would be worse than one honest guarantee.
Three decisions carry the design:
* GET /s/{id} touches NO storage, not even to check existence. Slack, Teams,
WhatsApp, iMessage and Outlook Safe Links all fetch a URL before a human
sees it, so destroying on GET would destroy most secrets in transit and the
recipient's "already used" would be indistinguishable from interception.
Only POST /reveal consumes. Bot user-agent detection is an arms race;
removing the side effect from GET is not. Pinned by
TestGettingTheRevealPageNeverConsumesTheSecret.
* Destruction is one Redis GETDEL, which is atomic. GET-then-DEL has a window
where two simultaneous readers both win, and for a one-time secret that
window is the product. The store contract demands atomicity and the same
concurrency test runs against both implementations.
* Missing, already-revealed, expired and evicted are ONE indistinguishable
410. Separating them would confirm to a prober that a given link was real.
The secret id IS the capability, so secret.ID is a struct whose every
accidental path — %v, %s, String(), slog, json.Marshal — emits a redacted
handle or refuses, and the raw value needs an explicit Value(). The first
version tried to prevent leaks by implementing no String() at all; its own test
caught that Go's fmt prints unexported fields anyway, so forbidding the method
had removed the control rather than the leak.
Operationally: structured JSON on stdout in the fleet's wire format, which
Vector already collects with no annotation; six hush_* metrics on the chassis
registry with no id, IP or path in any label; five alert rules wired into
vmalert. The public Ingress enumerates /, /s/ and /api/ so /metrics, /healthz
and /readyz share the port but are unreachable from the internet — no
basic-auth middleware to maintain and get wrong.
Dependencies are vendored because go-chassis is private: the Woodpecker test
step and the in-cluster Kaniko build both run -mod=vendor with GOPROXY=off and
hold no git credential.
cmd/hush-mcp is a stdio MCP server doing the same client-side crypto locally,
so using hush from an agent preserves the same guarantee as using it from a
browser.
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