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One keypair was copied to every node its owner joined, so cracking the bundle on
any single node yielded the identity used on all of them: their content on other
operators' machines, and the ability to sign as them anywhere. That lateral reach
was the part of C4 worth attacking.
Each node now gets its own keypair, generated the first time its owner joins it
and left with that node alone. An operator who cracks what sits on their own disk
holds a key that is a stranger to every other node — and on their own node, one
that unlocks nothing they did not already hold: they serve the content, the index
and every byte of it by design.
Nothing changes for the user. A first contact with a node already needed that
operator's code, and the key is created in the same step; a second browser still
recovers it from the node with the passphrase alone. Two operators can also no
longer tell they host the same person by comparing keys.
BREAKING, and deliberately without a compatibility path — the deployment is wiped
for the next demo:
- users.pk_ed25519 / pk_x25519 dropped (migration a7c31f9e40b2)
- registration no longer sends or stores a key
- PUT /v1/users/me/keys and regenerateKeys() gone; rotation is now
`member unpin` plus a fresh code, decided on the machine that pinned it
- /pubkeys returns an account id and a node's linking key. It was the directory
H3 read, and nothing wraps for it any more
- the pk_user JWT claim is gone
That last one closed a live defect the inventory turned up: the node recorded
pk_user as the uploader's identity and authorized deletion against it, so a hub
issuing a token naming its own key could delete anyone's uploads on any node.
Attribution now uses the key the node itself pinned.
A simplification falls out. Registration generates nothing, so a scripted signup
is a real account: `demo.py bootstrap` takes a wiped hub and node to a working
demo with no browser, which was impossible while keys were born in one.
Also fixes, found by running it on a wiped deployment: the key handed back on a
join now belongs to the group the connection is for, not the group named in the
invitation — an operator pairs node-wide but redeems the code while opening a
group, and expects to read it.
Tests: 343, including the two that state the property — a key pinned by one node
is refused at another, and someone else's code does not admit it. Verified end to
end against a wiped hub and node: bootstrap, pair, invite, join, download,
stream, second browser, revoke.
Design: docs/per-node-identity-v1.md
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Argon2id memory 64 → 128 MB. Memory is the lever, not time: it caps how many
guesses a card can hold at once, so the ceiling on one high-end GPU moves from
roughly 4k to roughly 2k guesses/s and its 24 GB fits ~187 lanes instead of ~375.
Measured through the vendored build: 640 ms, against 322 ms at 64 MB.
While measuring the real cost of a sign-in, found the SPA deriving the bundle key
twice — once for the key pair kept for the session, then again inside
decryptBundle() for the local bundle. At these parameters that is 0.6 s of pure
waste. Measured now, end to end:
auth_key (PBKDF2 600k) 239 ms
bundle v1 (PBKDF2 600k) 240 ms legacy, until every bundle is upgraded
bundle v2 (Argon2id 128MB) 650 ms
-----------------------------------
sign-in 1 129 ms (889 ms once no v1 bundles remain)
Once per sign-in, and only then: reopening a group, downloading, streaming and
reloading the page all reuse the key, which lives in IndexedDB from login.
Also bounds two waits in the node's hub WebSocket, found because the node went
silent again mid-deploy. It had reconnected after the hub restart, sent its auth
frame, and waited for a reply that never came — `ws.recv()` had no timeout, so a
hub that accepts a socket and then says nothing for a few seconds while starting
up parks the task forever: node running, logging nothing, invisible to everyone.
The auth exchange now times out at 15 s, connect at 15 s, and a refused auth
retries with a fresh token instead of ending the task for good.
QE harness signs in once per account and reuses the token — several clients there
stand for several browsers of one person, and what tells them apart is which keys
they hold, not which token, while the hub quite rightly rate-limits repeated
logins from one address.
Tests: 341, plus the live workflow.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Two corrections to yesterday's judgement, in the order they matter.
**The toggle is gone.** Asked to make the remote key backup optional, I shipped a
setting whose "off" position meant: no second browser, ever, and clearing your
storage destroys the account. I wrote the warning that says so without drawing
the conclusion. A control whose only effect is to break the ordinary case is not
a control, and removing an exposure by removing the feature is not a fix. Every
browser backs its keys up again, unconditionally.
**The exposure is fixed where it actually lives: the KDF.** The keypair bundle
rests on every node whose group its owner joins, protected by the passphrase
alone (finding C4). It used PBKDF2-SHA512 at 600k — compute-only, which is
exactly what a GPU eats. Measured on this machine: PBKDF2 600k costs 241 ms and
Argon2id 64 MB/t=3 costs 322 ms, near enough the same honest work, except only
one of them forces an attacker to find 64 MB per guess.
So the bundle key is now Argon2id 64 MB / t=3 / p=1, via a vendored WebAssembly
build (no external host — the CSP forbids one, and 12.2 will tighten it further).
Parameters chosen by measurement through that build: 19 MB is OWASP's floor at
118 ms, 256 MB is 1.3 s and too slow for a phone, 64 MB sits where a login should.
What this buys, stated honestly: cracking a bundle yields the owner's identity
keys, and with them content on OTHER nodes and the ability to sign as them — not
the content on the operator's own node, which they host in the clear by design.
Argon2id raises that price steeply; it does not remove it, and a weak passphrase
still loses. Hence the floor raised to 12 characters and ~60 bits in the same
breath, which can only be enforced client-side: with the password split (T1) the
hub never sees a passphrase.
Migration is automatic and invisible. Bundles carry an "MBK2" marker; the old
form is still readable, and is re-encrypted the first time a browser backs it up.
Both keys are derived at sign-in, because which one a bundle needs is only known
once it is read and the passphrase is deliberately not kept around.
Two implementations of the KDF now exist — the browser's WASM and argon2-cffi in
QE — so a parity test holds them byte-identical. A disagreement would not look
like an error; it would look like an account nobody can open.
keypair_bundle_delete stays, without a UI. It is the mechanism behind withdrawing
your data from a node, exercised end to end, and it will belong to a deliberate
"forget me on this node" action rather than a setting that quietly disables
multi-device.
Verified against the live deployment: the full workflow passes, including
recovering keys on a second client from the passphrase alone.
Tests: 341.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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The mechanism was already there — the encrypted keypair bundle goes to the node
after a first successful connection, and any client holding the password can
recover it — but nothing exercised it. e2e.py never pushed a bundle, so the case
that matters to an ordinary user was the one case never tested.
It now does what app.js does: backs the member's keys up to the node, then opens
a second client carrying nothing but a username and a password. Against the live
deployment that client recovers its identity keys, is recognised as the same
person with no second code, gets the same group key, and browses the group.
Also guards the ordering this depends on: the keypair bundle must be fetched
before joinGroup() runs, or a browser that did not register has no key to sign
the join with — invisible on the browser that did register, broken on every
other one.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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join_request signs a transcript over the node key and the node nonce, and runs
before the GEK proof — a first-time member has no key to prove with. Both values
were read further down, beside the proof that also uses them, so by the time
joinGroup() ran neither was set and every invited member got "Handshake
incomplete — reconnect and retry".
They are now recorded the moment the challenge arrives.
Third bug of the same shape found in a browser, and the reason is worth writing
down: QE/deploy/e2e.py cannot catch any of them. It is a second implementation of
the client, written in the right order by construction, so it passes while the
SPA fails. It proves the protocol; it proves nothing about app.js.
So this adds ordering guards over transport.js — source-level, which is not how
one would normally test behaviour, but it is what sees this class of mistake:
- node_pk and nonce_node are captured before joinGroup() runs
- the join happens before the GEK proof
- the ack still verifies the key the challenge announced
Verified the way the suite requires: each fails against the source as it was, on
the ordering assertion rather than on a missing marker.
e2e.py also waits for the node to re-register rather than reporting "no nodes" at
whoever just restarted the hub.
Tests: 337 across the three packages.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Phase 11.5.10.
POST /v1/nodes/announce accepted any pk_node with no proof the announcer held
the matching private key, so a user could register a node record carrying
someone else's node key, and records accumulated without limit.
The announcer now signs a domain-separated message binding the key to their
account — meshbay:node_announce:{user_id}:{pk_node}:{timestamp} — reusing the
shape already proven by /v1/nodes/auth, so a signature for one can never
satisfy the other. Same 60-second window.
Re-announcing the same key now updates the existing record in place instead of
creating a new row.
Three test helpers had to be taught to sign, which is the useful part: nothing
in the suite had ever exercised announce with an attacker's key. The new tests
cover the missing proof, a foreign key, a stale timestamp, and idempotence.
Note for the record: the node key is independent of the user's identity key.
Two hub tests asserted the announced pk_node equalled the user's pk_ed, which
happened to be true only because the daemon announces its keystore key. They
now assert against the announced key itself.
Tests: 157 hub+common, node suite green.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Phase 11.5 — findings H6, C4 (partial), and milestone 11.5.3.
H6 — resource exhaustion. Several paths let one peer degrade or stall a node:
* the DataChannel frame limit was a flat 64 MB applied BEFORE authentication,
so an unauthenticated peer could announce a huge frame and dribble bytes
into it. Unauthenticated peers now get 64 KB; the large budget is granted
only after the GEK proof, where it is needed for uploads.
* _do_stream_segment ran subprocess.run(..., timeout=30) directly in the event
loop, stalling the entire daemon — every peer, every group — for up to
thirty seconds per request. Now async, with a timeout and process kill.
* ffmpeg was spawned per stream request with no cap. Both streaming paths now
share a transport-wide semaphore.
* POST /v1/nodes/{id}/webrtc/offer was reachable by any authenticated user for
any node, with no membership check and no rate limit, making the target node
allocate an aiortc PeerConnection and gather ICE on demand — remote resource
exhaustion against a third party's machine. Now rate limited, capped per
user, SDP size bounded, and the caller must share an active group with the
node. That also closes the H4 gap where signaling ignored group status.
* POST /v1/nodes/{id}/incoming took peer_ip verbatim, so any user could make an
arbitrary node emit UDP packets to an address of their choosing. The probe
target must now match the caller's own source address.
C4 (partial) — the pre-proof bundle window. GEK and keypair bundle fetches are
served before the GEK proof by necessity: the client needs its wrapped bundle in
order to compute the proof. That window is a disclosure surface a hub can reach
by forging a JWT. Bounded to 4 fetches per session and audited as
"pre_proof_fetch". The real fix is removing remote keypair bundles entirely,
which belongs to the native client (Phase 13.3).
11.5.3 — the node admin UI was unauthenticated because it binds loopback. But
any local process can reach it, and so can a page in the operator's browser via
DNS rebinding — and this API re-initialises group keys and reads the audit log.
H2 showed script execution there equals full control. Now gated by a per-run
token, printed at startup, accepted as ?t= or X-MeshBay-Token.
One test needed rewriting rather than adding: the first version asserted
"subprocess.run(" was absent from the source, which also matched the comment
documenting the old behaviour. It now parses the AST and checks the property.
Tests: 121 node, 142 hub+common. Regression suite 47 node + 10 hub.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Phase 11.5 — finding C2 (see second-review.md).
/v1/nodes/ws took node_id and group_ids straight from the client's first
message with no ownership check:
node_id = msg.get("node_id") or decoded.get("sub", "unknown")
_connected_nodes[node_id] = ws
Any registered user could connect with an ordinary browser token, claim a
victim node's id and overwrite its entry. Every WebRTC offer for that node was
then relayed to the attacker, who answered with their own SDP — full node
impersonation. The DTLS channel binding does not help, because the attacker is
the endpoint rather than a relay: the browser sends its GEK proof to the
attacker, who ignores it and replies handshake_ack. The attacker received the
victim's encrypted keypair bundle, chat and uploads, and could serve a forged
index.
Registration now requires scope == "node", verifies Node.user_id against the
token subject, checks the account is active, and refuses to displace a live
registration instead of silently overwriting it.
group_ids are intersected with the operator's actual membership: a node may
narrow the set to what it hosts but cannot widen it, so it cannot advertise
itself as an online source for arbitrary groups.
Authorization uses a short-lived session rather than Depends(get_db): a node
WebSocket lives for hours and a request-scoped dependency would pin a
PostgreSQL connection for its whole lifetime.
BEHAVIOUR: a node hosting a group whose hub membership was never recorded for
the operator's account will stop appearing in GET /v1/groups/{id}/nodes.
Adds tests/test_node_ws_auth.py (7 tests). The node WebSocket had no test
coverage at all, which is why this went unnoticed.
Tests: 109 node, 139 hub+common.
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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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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Browser clients can now connect P2P to nodes behind residential NAT via
WebRTC DataChannel with ICE/STUN. Validated on SFR Port-Restricted Cone
NAT + 4G CGNAT across three scenarios (WiFi LAN, 4G IPv6, 4G IPv4 STUN).
No TURN relay needed. Hub serves only as signaling relay (<1 KB).
New files:
- webrtc_server.py: aiortc-based WebRTC transport (node side)
- signaling.py: SDP/ICE relay endpoint (hub side)
- transport.js: browser WebRTC client with msgpack framing
- webrtc-test.html: spike test page for browser→NAT→node validation
- test_webrtc_transport.py: 4 tests (handshake, file transfer, auth, guard)
- meshbay-draft-v4.md: architecture spec updated for web client
Modified:
- hub_client.py: WebRTC offer handling via hub WebSocket
- revocation.py: node_id from WS auth + webrtc_answer routing
- pyproject.toml: aiortc>=1.9 dependency
123 tests passing (117 existing + 6 new).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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8.1 Config-based admin authz (require_admin on all admin endpoints)
8.2 Email encrypted at rest (AES-256-GCM, HKDF from hub Ed25519 key)
8.3 Refresh token rotation with family-based reuse detection
8.4 Federation persistence (HubPeer model replaces in-memory dict)
8.5 Federation token verification now async (DB-backed)
8.6 CSAM hash check wired into swarm registration flow
8.7 Rate limiting on auth endpoints (5/10/20 per minute)
8.8 Healthcheck endpoint (GET /v1/health, no auth)
8.9 IP log cleanup background task (365-day retention)
8.10 Argon2id params bumped to 256 MB (pw_version, rehash on login)
Deployed to meshbay.org — schema migrated, existing emails encrypted.
117 tests pass (29 hub, 88 common+node).
Resolves security review items S1, S2, S5.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Implements all 8 milestones (7.0-7.7):
- 7.0: JWT carries `groups` claim; node verifies group membership at
MNP handshake (QUIC + TCP+TLS). Resolves security review C2.
- 7.1: QUIC 0-RTT session resumption via stored session tickets
(17-21ms reconnect vs 47ms cold).
- 7.2: Hub→node WebSocket signaling for NAT punch coordination
(`client_incoming`/`punch_ready`) + jti denylist push. Denylist
class blocks revoked users/jtis at handshake.
- 7.3: Multi-group daemon — one QUIC port serves N groups with
per-group GEK, shared_root, and index routing.
- 7.4: HLS streaming via QUIC (STREAM_SEGMENT message type, ffmpeg
segment extraction).
- 7.5: Sender Keys protocol for group chat (Signal Groups approach).
Each member has own sending chain key, HKDF chain ratchet, AES-256-GCM
encryption, Ed25519 signing. Resolves security review C1.
- 7.6: Chat store (SQLite via aiosqlite), CHAT_MESSAGE MNP wire type
with peer broadcast, web UI with WebSocket push.
- 7.7: Argon2id calibration CLI.
First security review included (first-review.md). 109 tests, demo-v3
validated against meshbay.org production hub.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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DB: ContentReport + ContentBlocklist tables.
POST /v1/reports: public endpoint, auto-blocks after 2 reports.
GET /v1/blocklist/check: node sync check before serving public content.
GET /v1/blocklist: full list for node startup sync.
GET|POST|DELETE /v1/admin/blocklist: admin management.
6/6 tests. Full suite: 59/59.
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
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Hub: /v1/nodes/ws WebSocket endpoint for persistent node connections.
/v1/admin/revoke marks user/group revoked in DB, signs JWT revocation
token (EdDSA), broadcasts to all connected nodes.
Node: RevocationSubscriber maintains WS connection, verifies
incoming revocation tokens offline (hub Ed25519 PK), adds to
local blocklist (_revoked_users/_revoked_groups sets).
53/53 tests.
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
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config.py: TOML + env var priority. auth.py: Argon2id passwords,
JWT EdDSA with jti, refresh token hashed (blake3). Routers:
hub (info/pubkey), users (register/login/refresh/pubkeys),
nodes (announce/get), groups (create/gek-bundle/gek-retrieve).
Rate limiting via slowapi. app.py factory with lifespan.
All 40 tests pass (SQLite in-memory, no PostgreSQL required).
Fix: remove tests/__init__.py to resolve namespace conflicts.
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
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3-package layout: meshbay-common (shared crypto/protocol),
meshbay-hub (FastAPI server), meshbay-node (local daemon).
Includes validated POC spikes 1-6 in poc/, architecture drafts
v1/v2 in docs/, and CLAUDE.md project conventions.
All cryptographic primitives extracted from POC into
meshbay_common/crypto.py (GEK wrap/unwrap, chunk key derivation,
keystore encryption, chunk signing).
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
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