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The invite flow fetched the invitee's pk_x25519 from the hub and wrapped the
GEK for whatever came back (app.js:1466, and gek-init did the same server-side).
The hub is the key directory, so a hub answering with its own key was handed the
group key by an honest member following the protocol exactly. No forgery, no
injection, nothing for the client to notice. That was H3.
The fix is not safety numbers. Nobody reads the directory any more:
- the node holds the GEK and wraps it itself, on every connection, for the
X25519 key the joiner signed with their Ed25519 identity in one transcript
(meshbay:join:v1), so the identity key vouches for the encryption key;
- identities are bound to accounts by a one-time code the hub never sees —
40 bits, single use, one account, bounded per connection AND node-wide;
- the node's own roster decides who may receive the key. Hub membership lets
someone reach a node; it no longer gets them anything. A hub that invents an
account and mints it a token is answered not_authorized_for_group.
Safety numbers would have made substitution detectable by a human who checks, at
the moment there is nothing to check against — first contact. Removing the lookup
makes it impossible, and costs the user one code to pass along.
M3 falls out of the same work. The daemon auto-pinned its own keystore key as
admin_pk_ed25519 while the browser signs with the user identity key, so every
privileged operation failed closed with a signature error that looked like a bug
somewhere else; the demo only worked because a deploy script overwrote the value.
Authority now comes from the roster, established locally by `operator pair`.
Asking the hub for the operator's key — the obvious-looking fix — would have let
the hub install itself as node administrator.
BREAKING: gek_bundle_store is deleted, not gated. No member hands the node key
material at all, so C5b becomes structural rather than an authorization to check.
Existing stored bundles are still served, so current deployments keep working.
Also:
- join_policy (invite|open) is read from node.toml, never from the hub — a hub
able to declare a group open would be handed its key. Unknown group ⇒ invite.
- admin signatures are verified against the roster on every check, so unpinning
takes effect without a restart. admin_pk_ed25519 stays readable as legacy.
- two C5b tests were rewritten, deliberately: they asserted that
gek_bundle_store demanded an operator signature, and the message is gone. They
now assert the stronger property. The file says not to fix these tests, so
this is the record of why they changed.
- a slice-1 bug found while writing slice 2: connect() never passed skEdB64, so
pairing would have failed at runtime with no test able to catch it.
Tests: 152 node+common here, including an end-to-end DataChannel run where a
member who has never held the group key redeems a code in the pre-proof window
and receives the key wrapped for a key only they can open.
Design: docs/invite-pairing-v1.md
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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The client verified the node's Ed25519 signature but did not remember which key
it had seen, so a substituted node was caught only by its lack of the GEK.
Trust On First Use: the node's public key is recorded per node_id on the first
successful handshake and compared on every later one. A change is refused
outright — strict, per operator decision. A warning users can click through is
decorative, and this is the SSH known-hosts tradeoff taken deliberately.
Scope, stated honestly: with C6 closed this is defence in depth, not the primary
control. A substituted node already fails the GEK proof. Pinning covers the case
where an attacker HAS the group key — an ex-member, or a leaked GEK — and swaps
the node underneath, which the proof alone cannot distinguish from the real one.
Strict refusal needs an escape hatch or it is a dead end: a node operator who
reinstalls and loses their keystore generates a new pk_node and would otherwise
lock out every member. Settings gains a "Node identities" section showing the
pin count and clearing them, with copy telling the user to verify out of band
first. Also exposed as MeshBayTransport.clearNodePin() for the native client.
Tests: hub+common green; all five static JS files syntax-checked.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Baseline commit capturing in-progress Phase 12 work that was already present
in the working tree (uncommitted) before the Phase 11.5 security remediation
begins. Committed as-is, without review or modification, so that remediation
changes arrive as a separable diff.
Contents: BundleStore (P2P GEK + keypair bundles), password split
(auth_key / bundle_key), node Ed25519 auth (POST /v1/nodes/auth, node-scoped
JWT), GEK-HMAC handshake proof with DTLS channel binding, Ed25519 admin
challenge-response, node local admin UI rewrite, browser key persistence.
Not authored in this session — captured to establish a baseline.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Replace download-then-play VideoPlayer with MSE (MediaSource Extensions)
streaming. Node remuxes to fMP4 via ffmpeg, probes codecs with ffprobe,
and sends encrypted segments over DataChannel. Browser decrypts and
appends to SourceBuffer — playback starts within seconds.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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inline thumbnails
- Upload chunks capped at 64KB to avoid WebRTC DataChannel max-message-size
- Show cached files immediately while WebRTC connects (tabs visible during connection)
- Persist sender_name in chat store (SQLite) — no more UUID display in history
- File delete action in menu (node admin only, enforced server-side)
- FILE_DELETE / FILE_DELETE_ACK MNP message types
- Inline image thumbnails in chat attachments (download+decrypt, Signal-style)
- Member panel: "Owner" label instead of "Group admin" to avoid hub/group admin confusion
- Create group page: hint about needing a node
- Refresh index after chat file attachment upload
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Bug fixes:
- Group creation "[object Object]" error: removed dead pkcs8 import code
that threw before GEK wrapping, added array detail handling in hubFetch
- Chat shows usernames instead of UUIDs (sender_name passed through node)
- Join button: navigate to group on "Already a member" instead of error
UI improvements:
- Loading spinner animation for async states (connecting, fetching)
- File action menu (3-dot dropdown: View, Download, Play)
- Click filename to preview inline (images, text/code files)
- FilePreview overlay for images and text files
- Chat file attachment button (upload to node + structured message)
- Chat attachment display (icon, filename, size)
- Member panel: "Group admin" badge instead of plain "Admin" text
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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search)
Six self-service features for the web SPA:
- Group creation UI with GEK auto-generation (AES-256-GCM ECIES)
- Member management + invite by username (GEK wrapping for invitee)
- Open group self-join flow (POST /v1/groups/{id}/join)
- File upload client→node (FILE_UPLOAD MNP type, .uploads/ staging)
- IndexedDB caching of group file indexes (instant display on revisit)
- Cross-group file search (SearchPage, pure client-side on cached indexes)
11 new tests (166 total): 8 group self-service + 3 AES GEK wrap/unwrap.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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- 10.5: Notification model + CRUD API (list, mark read, mark all read)
Triggered on: group invite, role change, suspend/unsuspend
- 10.6: SettingsPage shows role, per-group notification mute (localStorage)
- 10.7: GET /v1/groups?q= search filter (ilike on name)
- 10.8: NotificationFeed on home page + bell with unread badge in navbar
- 10.10: GET /v1/hub/version endpoint for client update checks
- 8 new tests (test_notifications.py), 155 total
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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- Site overlay: landing page, /about, /downloads (dark/light, responsive)
- User role column (user/moderator/admin) with config-based admin sync
- require_moderator dependency + admin API (8 endpoints: stats, users,
groups, audit logs)
- Admin SPA panel at #/admin with 5 tabs (stats, users, groups, logs,
blocklist) — visible only to moderators/admins
- SPA also served at /app/ for Caddy site overlay integration
- GET /v1/users/me returns current user role
- 15 new tests, 147 total passing
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Complete browser-based client: Preact SPA with login, group file browser,
encrypted download, video playback, group chat, i18n, and dark/light theme.
Browser connects P2P to nodes behind residential NAT via WebRTC DataChannel
(aiortc). Hub handles signaling only — all data flows E2E.
Performance: pipelined downloads (8-chunk sliding window), binary msgpack
wire format (no base64), redundant I/O elimination. Large file downloads
stream to disk via File System Access API (showSaveFilePicker).
Validated on SFR + Orange residential NATs, Chrome + Firefox, IPv4/IPv6.
132 tests passing. Deployed to meshbay.org + Orange node.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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