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session token
A member authenticated to a node in the MNP handshake with its hub *session*
token — scope=user, valid at the hub API for hours. A node operator is in the
threat model, so this handed them a live hub credential for the member: enough
to enumerate the member's other groups, act as them, and (before the previous
commit closed it) take the account over. The node genuinely needs a hub-signed
membership assertion, so the fix is to make that a separate credential that
opens nothing at the hub API.
Two audiences signed by the one hub key (meshbay_common/tokens.py):
- HUB_API_AUD — session tokens (login, device-auth, node-auth, refresh), used
for hub calls and signaling. decode_access_token now binds this audience, so
an MNP token cannot be replayed against the hub API.
- MNP_AUD — a short-lived token a member presents to a node and nothing else,
from POST /v1/nodes/mnp-token. authorize_token now binds this audience, so a
session token presented to a node is refused. This closes the disclosure.
The node's own self-decode (hub_client.py) reads its node token with
audience=HUB_API_AUD. The client fetches the MNP token inside transport.connect()
(and on every reconnect) using the session token, so callers are unchanged and
signaling keeps using the session token.
No regression to a long session: the MNP token is checked once, at the
handshake, before any proof — a film already playing is not re-authenticated, so
a 15-minute token does not interrupt a 4-hour film; reconnects refetch a fresh
one. Denylist and membership checks are unchanged (the MNP token carries
sub/jti/groups).
Tests: authorize_token refuses a session/no-audience token and accepts an MNP
token; the hub API refuses an MNP token; POST /v1/nodes/mnp-token is minted only
for a member's own session. Verified red-before/green-after; common, node and
hub suites green (the pre-existing test_cli_golden failure is an argparse/pytest
prog artifact unrelated to this change).
Still to do before deploy (B2): bump the MNP version and client.minimum so a
stale desktop client is told to update rather than getting a handshake refusal,
update docs/MESHBAY_DESIGN.md and MESHBAY_NODE_PROTOCOL.md, and validate against
a real node locally, then deploy hub+node+SPA atomically.
Co-Authored-By: Claude Opus 4.8 <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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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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Register/login/announce/token-refresh/GEK-unwrap. JWT jti and
pk_user verified at login. Hub PK cached after first fetch.
6/6 tests passing with httpx.MockTransport (no network).
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
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