screentinker/server/routes
ScreenTinker dce0bc6f54 fix(devices): generate access-gating six-digit codes with a CSPRNG
The on-device settings PIN (devices.settings_pin, minted at pairing) and the pairing code
assigned to imported devices both came from
`Math.floor(100000 + Math.random() * 900000)`.

Math.random is not a CSPRNG. V8 implements it as xorshift128+, whose internal state is
recoverable from a handful of consecutive outputs, and every call in a process draws from
that one shared stream. Both values are also observable by ordinary users — settings_pin
is returned in device API responses today — so a user who collects a few outputs could
predict the values minted around them, including for other tenants.

lib/numeric-code.sixDigitCode() uses crypto.randomInt, which is CSPRNG-backed and
rejection-samples so the distribution stays uniform. Range is 100000..999999 inclusive,
identical to the old expression, so codes are still exactly six digits with no leading
zero — the on-device keypad and pairing UI are unchanged.

Deliberately NOT converted, because neither gates access: the image-generation seed in
lib/image-gen.js, and the anti-burn-in pixel jitter inside generated widget HTML.
Also unchanged: the settings_pin backfill in db/database.js, which uses SQLite's random()
— that is ChaCha20 seeded from OS entropy, not a weak PRNG.

This is the generator half of the finding only. The separate half — that settings_pin is
returned to every workspace member, including read-only roles — is a response-shape change
and waits on the consumer enumeration.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-07-26 14:24:03 -05:00
..
activity.js Phase 2.1: tenancy middleware, permission helpers, JWT workspace context, frontend + backend role-rename compat 2026-05-11 20:02:00 -05:00
admin.js feat(dashboard): version indicator + GHCR update check (#165) 2026-07-10 22:40:06 -05:00
agency.js feat(agency): per-token upload folder — auto-created, subtree-confined (#158) (#171) 2026-07-12 21:23:25 -05:00
ai.js feat(ai): separate optional image API key (#41) 2026-06-09 13:47:47 -05:00
assignments.js fix(server): floor duration_sec to prevent widget zero-duration player loop (#199) 2026-07-17 13:41:52 -05:00
auth.js refactor(auth): centralise session token resolution across manual verify sites 2026-07-24 20:58:05 -05:00
billing.js feat(#146): billing:read scoped token — dual-path auth for the Usage Report (Option C) 2026-07-01 21:16:21 -05:00
contact.js fix(landing): replace broken Custom pricing card with enterprise contact form 2026-05-14 13:52:24 -05:00
content.js feat(content): subtitle/caption support as a content property (#223) 2026-07-23 12:33:35 -05:00
device-groups.js feat(system-control): Tier 0/1 controls with no device-owner dependency (#160) (#169) 2026-07-12 20:48:47 -05:00
devices.js feat(diagnostics): device incident log — offline cause, network-vs-reboot, display-sleep (#175) 2026-07-13 11:26:04 -05:00
folders.js Phase 2.2c: content_folders gets workspace_id (schema + backfill); folders.js scoped; content.js folder-move strict same-workspace 2026-05-11 21:04:03 -05:00
kiosk.js fix(widgets): no-store on widget/kiosk render 2026-06-08 23:46:42 -05:00
layouts.js fix: per-item mute round-trip + multi-zone orphan-zone fallback & warnings 2026-06-22 23:16:29 -05:00
media.js feat: transition engine — GL wipes across web, Tizen & Android (+ image↔video) (#204) 2026-07-20 16:45:32 -05:00
pip.js fix(#109): render Android PiP overlay above the YouTube WebView video plane (#135) 2026-06-19 14:49:20 -05:00
player-debug.js Add player debug overlay and server-side error telemetry sink 2026-05-15 15:20:42 -05:00
playlists.js feat(content): subtitle/caption support as a content property (#223) 2026-07-23 12:33:35 -05:00
provisioning.js fix(api): consolidate device pairing to /pair, remove vestigial bare endpoint (#90) 2026-06-12 20:13:16 -05:00
reports.js Phase 2.2g: reports.js scoped to workspace_id; fixes pre-existing /export and /uptime cross-tenant leaks 2026-05-11 21:36:54 -05:00
schedules.js Phase 2.2m: schedules.js scoped to workspace_id; schedule.workspace_id inherited from target (device/group); fixes 6 pre-existing cross-tenant leaks (POST content/widget/layout/playlist accepted with no check, PUT verifyOwnership rewrite across all 6 polymorphic targets) 2026-05-11 23:03:54 -05:00
status.js fix(devices): generate access-gating six-digit codes with a CSPRNG 2026-07-26 14:24:03 -05:00
stripe.js feat(stripe): enable promotion codes on checkout sessions (#227) 2026-07-23 23:44:18 -05:00
subscription.js Initial open source release 2026-04-08 12:14:53 -05:00
teams.js feat(teams): temporarily disable Teams API while feature is redesigned 2026-05-12 13:30:55 -05:00
tokens.js feat(agency): per-token upload folder — auto-created, subtree-confined (#158) (#171) 2026-07-12 21:23:25 -05:00
video-walls.js feat(socket): delivery queue for offline-device emits 2026-05-14 13:06:43 -05:00
white-label.js fix(security): patch quick-win findings from the codebase review 2026-06-08 19:02:19 -05:00
widgets.js feat(directory-board): panel-ring scroll + in-place refresh + per-device frame diagnostic (#203) 2026-07-17 20:17:21 -05:00
workspaces.js fix(workspaces): use APP_URL env var for invite-accept URL generation 2026-05-17 15:26:07 -05:00