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The pass before this applied ruff's own fixes. These are the ones needing a
decision, and the point of doing them is that `ruff check .` now passes: a
linter reporting 98 known-acceptable findings reports nothing, because the next
real one arrives invisible.
**Lines over 100 (70).** Mostly wrapped where they stood. Two exceptions: the
aligned trailing comments in `protocol.py`'s message table were shortened rather
than wrapped, because wrapping one row of a table breaks the table; and in
`models.py` the column comments moved above their columns for the same reason.
**Imports below the first statement (14).** `csam.py` kept its FastAPI imports
under a section header halfway down the file; two node tests had a constant and
a `pytestmark` wedged between two import blocks. Moved, not suppressed.
**Bindings nothing reads (4).** Three in tests, where the call stays and only the
name goes — `_user(client, "listener")` is there to create the user, not to
return one. The fourth was in `revocation.py` and was not a lint finding at all:
`_connect_and_listen` opened an httpx stream to the WebSocket URL, did `pass`,
and then opened the real connection through the `websockets` library. One
pointless request per connect, left over from before that library was used
directly. Removed, and `httpx` with it.
**`l` as a name (4)**, **semicolons (6)** in the POC spikes, and the rest.
2893 passed, the same count as the two commits before it.
`meshbay_node/revocation.py` is worth a decision separately: 154 lines that
nothing imports, superseded by `hub_client.maintain_ws`'s `on_revocation`. This
commit only stopped it failing the linter.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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`ruff check .` had gone unrun long enough to report 568 errors, which is the
same as having no linter: the next real finding would have been invisible in the
noise. This is the 521 it fixes by itself, in 173 files, and nothing else — the
98 it cannot fix are the next commit.
What actually changed: import sorting (225), imports nobody used (87, none of
them a re-export — no `__init__.py` is touched, which was the one way this could
have broken an import elsewhere), `datetime.timezone.utc` to `datetime.UTC` (69)
and `asyncio.TimeoutError` to `TimeoutError` (18), both plain aliases on the 3.12
this project requires, `Optional[X]` to `X | None` (24), and f-strings with
nothing to interpolate (19).
Checked rather than assumed: every module in the three packages still imports,
and the suite is 2893 passed — the same count, test for test, as the merge
before it.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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names its parameters
`pw_version` 4: Argon2id 64 MiB, t=3, lanes=4 — RFC 9106's second recommended
setting. A v3 hash (256 MB) still verifies at its own parameters and is
rewritten at the new ones on the next sign-in, through the rehash path that
already existed.
Why not more. The verifier matters against an offline attacker holding the
database; online guessing is bounded by the sign-in lockout. That attacker pays
the client's 600 000 PBKDF2-SHA512 iterations and the hub's Argon2id per guess,
since `auth_key` is 256 bits and cannot be searched directly. Memory above
64 MiB multiplies that cost by a constant — at most 16 at 256 MB, less with
PBKDF2 counted — while the hub pays the same memory at every sign-in, one
derivation at a time. Measured on meshbay.org: 450 ms at 256 MB, 105 ms at
64 MiB, so a burst of sign-ins clears about four times faster.
Changing the current version exposed a latent lockout. `hash_password` always
used the current version's parameters, while the raw-password scheme recorded
`pw_version = 2` — harmless while versions 2 and 3 shared their parameters,
and with version 4 every legacy registration and v1→v2 rehash would have
stored a 64 MiB hash labelled 256 MB, which nothing could then verify. Seventeen
tests caught it. `hash_password` now takes the version it is hashing for.
The OpenSSL deadlock between two concurrent `lanes=4` derivations is the same at
64 MiB, so Argon2 stays on its single worker. The loop-stall test measures
against a v3 hash, because half of a 45 ms inline derivation is too close to
scheduling noise to be a reliable bound.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LcF3QKWii7uQ2kSyXErzCt
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Existing shorter accounts keep signing in. Test usernames padded to match.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XuNrwLf5EFWCMHzfoEvnpm
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group's hosts are its members'
Two checks that were not performed, in the same shape: something true of the
public case, written so it did not apply to the rest.
**Signaling.** The membership check read `if node_group_ids:`, so an empty set
skipped it — membership, group status and the public-group gate together — and
the offer was relayed. Since AV1 made an empty claim mean "no groups" rather
than "all of my owner's", that is the *normal* registration of a node hosting
nothing: the unconfigured node left running, the machine in this register's
founding incident, and the one least able to absorb the work. Each offer makes
it allocate an RTCPeerConnection and gather ICE, 30 a minute, which is H6
restored in exactly the case AV1 made common. It is refused now. Nothing
legitimate is lost: such a node refuses the handshake anyway — `group_id` is
mandatory (M1) and a node with no group key refuses (NS8) — so this declines
work the node would decline one step later at its own expense.
**The node list.** `GET /v1/groups/{id}/nodes` checked membership only for a
public group with public groups switched off. A private one answered any
authenticated account that knew the id — which an ex-member knows for ever —
with the ids and public keys of the machines hosting it. §7.4 already stated the
property for the public case. Membership is required now unless the group is
public and public groups are on. Nothing needs the list before joining: an open
join writes the membership row first, and an invitation registers the invitee's
when the code is created, both checked before making the change.
`test_webrtc_signaling_roundtrip` had to be repaired, and is the finding
restated: it registered a node in `_connected_nodes` and never in
`_node_groups`, so it drove the relay through the hole rather than through the
door — the check it routed around was the defect. It now registers the group a
real node registers.
§7.2 and §7.3 gain the rules, the register AV24 and AV25, and
test_availability_between_members.py two cases that fail on the property
against the previous source.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UMxEQadpzPkYLFf5CYKhpW
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An availability review, prompted by the group claim above: a participant
supplies input — who else bears the cost? Six answers where the cost fell on
someone other than the sender, and none of them needs an attacker.
AV3 `chat_notify` carried a `group_id` the hub believed, so any connected
node could write a notification to every member of any group on the
hub, carrying a display string of its choosing, with its account
having no relation to that group. This is the group claim again, two
hundred lines further down the same socket. Gated on what the node is
registered for, and metered: the fan-out is one write per member. The
budget expires by time rather than on disconnect, or reconnecting
would refill it and a node token is good for an hour.
AV4 A swarm source named its own `endpoint` as free text documented as
"ip:port", so an account could publish a third party's address — H6's
`peer_ip` defect, never applied here. Nothing dials a swarm source
today, which is the only reason it was not already a reflection
primitive. It is a transport and a port now, never a host, and the
number of hashes one account may claim is bounded: rows were keyed
(hash, account) with no cap at all.
AV5 `handle_webrtc_answer` resolved any pending `peer_id` from any node's
socket. The answer is the SDP a browser then connects to. That this
had not happened rested on a uuid4 being unguessable.
AV6 `relay_register` had no authentication of any kind: it compared
`pk_relay` against the approved value, which is a *public* key, so
anyone who could read it could rewrite where the hub tells nodes to
send relayed traffic. The module docstring promised signed JWTs and
`jwt` was imported and never used.
AV7 The node held unlimited peer connections and kept one that never
completed a handshake for the life of the daemon. H6 bounded what one
unauthenticated peer costs; the hub's cap is three offers in flight
per *account*, a limit on each caller and not on the machine, so an
operator's exposure grew with the size of their groups.
AV8 `invite-notify` put a request-supplied `group_name` into the subject
of an email the hub sends under its own domain, to any account, with
no rate limit. The name comes from the group row now.
The tests are two accounts each, in one file that says why: a one-member test
proves a one-member property, and every finding here needed a second person
to exist at all. Each was checked against the unfixed code. Two did not
survive that check and were rewritten — one re-enacted the disconnect path
instead of running it (hence `forget_node`), the other called the reaper
itself and would have passed with the call removed from `handle_offer`.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T4YmK41VsEURWFdop4EEeT
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`Cache-Control: no-cache` requires a browser to revalidate, but it only binds
one that asks. A browser that cached app.js before that header existed applies
heuristic freshness instead — a fraction of the file's age, which for a file
dated weeks ago is days — and never asks. It then runs an old player against a
new node.
That cost most of a session. A phone kept a player without the read-ahead bound
and filled the browser's buffer ceiling at 106 MB, the exact symptom the bound
had been written to remove, for an hour after the bounded player went live. A
fix that is written, tested, deployed and served, and still not what runs, is
indistinguishable from a fix that does not work.
The whole module graph now lives under `/a/<content-hash>/`. A path prefix
rather than a query string, because relative imports inherit it: `app.js`
reaching for `./i18n.js` gets the build it was written against, and never a
mixture of two — which does not render a stale page, it fails to link. The URL
changes with the content, so those may be cached hard.
`sw.js` stays at the root. Its scope is its own path, and under the prefix it
would no longer control the pages whose downloads it exists to intercept.
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Leaving is its own endpoint rather than a relaxation of the owner's removal
check — an authorization rule with an exception in it is the one that gets read
wrong later. The owner cannot leave: the group would be left with nobody able
to admit, edit or delete it, which is the answer removal and account deletion
already give.
Public groups are capped at ten live ones per owner. They are the ones that
cost other people something — listed in Discover, joinable by anyone — so a
script that opens hundreds fills the directory for everybody. Private groups
are invisible to non-members and are not capped. Hub staff are exempt; the cap
is anti-spam, not a rule about running an instance. Creation is the only place
it can be checked, and deliberately so, because PATCH refuses to change
visibility at all.
A group is now listed only once a node has announced that it hosts it. Before
that it has no files, no key and nothing to connect to, so showing it to a
member produces a name they cannot open and cannot be told why; its owner still
sees it while they set the node up. `meshbay-hub prune-groups` collects the
ones that never got a node, meant for cron, with --dry-run. The migration
backfills hosted_at from created_at: without that the first run would have
deleted every live group.
Presence rides on the group list itself, read from the signaling registry the
hub already keeps — no poll, no timer. It says a node is connected *to the hub*,
which is not a promise that this browser can reach it and not something a
dishonest hub could not fake; the client downgrades it on a connection it tried
and failed, which is the evidence that concerns the reader.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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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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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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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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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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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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