70 lines
3 KiB
JavaScript
70 lines
3 KiB
JavaScript
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/// <reference path="../pb_data/types.d.ts" />
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// Server-side child-PIN verification (issues #13/#14 follow-up).
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//
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// `profiles.pinHash` is a hidden field *by design*: if any logged-in device
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// could read it, a child holding the TV could pull the salted SHA-256 and
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// brute-force a 4-digit PIN offline in milliseconds. The cost of that design:
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// a device that never saw the PIN being set (a TV signing in after the parent
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// set the PIN on the PC) has no local verifier and nothing readable to check
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// against — the gate always said "wrong PIN" there. This route closes the gap:
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// the client sends the candidate PIN, the server compares against the stored
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// hash and answers yes/no. The hash never leaves the server, and guessing is
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// rate-limited (5 failures per 5 minutes per account+profile) so the endpoint
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// can't be brute-forced either.
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//
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// The app mirrors a successful verify into its local secure storage, so each
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// device pays this round-trip at most once per profile (and works offline
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// afterwards) — see ProfileService.verifyPin.
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// ── POST /api/amber/verify-pin ────────────────────────────────────────────────
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// Auth: account owner. Body: { profileId, pin }. → { ok: bool } (429 when
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// rate-limited, with retryAfter seconds).
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routerAdd("POST", "/api/amber/verify-pin", (e) => {
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const MAX_FAILS = 5
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const WINDOW_SECONDS = 300
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const data = new DynamicModel({ profileId: "", pin: "" })
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e.bindBody(data)
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const profileId = (data.profileId || "").trim()
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const pin = (data.pin || "").trim()
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if (profileId === "" || !/^\d{4}$/.test(pin)) {
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return e.json(400, { ok: false, error: "profileId and a 4-digit pin are required" })
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}
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let rec = null
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try {
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rec = $app.findRecordById("profiles", profileId)
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} catch (_) {
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return e.json(404, { ok: false, error: "profile not found" })
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}
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// Owner-scoped, like the profiles collection rules.
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if (rec.getString("user") !== e.auth.id) {
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return e.json(404, { ok: false, error: "profile not found" })
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}
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// Fixed-window rate limit in the app store (shared across the isolated
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// handler JSVMs — file-scope state is not, see device_auth.pb.js).
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const store = $app.store()
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const key = "amber.pinFails." + e.auth.id + "." + profileId
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const now = Math.floor(Date.now() / 1000)
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let st = store.get(key)
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if (st && st.resetAt <= now) st = null
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if (st && st.count >= MAX_FAILS) {
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return e.json(429, { ok: false, error: "too many attempts", retryAfter: st.resetAt - now })
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}
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const stored = rec.getString("pinHash")
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// Same shape the app stores: sha256("<profileId>:<pin>") hex.
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const ok = stored !== "" && stored === $security.sha256(profileId + ":" + pin)
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if (ok) {
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store.set(key, null)
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} else {
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store.set(key, {
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count: (st ? st.count : 0) + 1,
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resetAt: st ? st.resetAt : now + WINDOW_SECONDS,
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})
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}
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return e.json(200, { ok: ok })
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}, $apis.requireAuth("users"))
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