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Phase 11.5.4 — QUIC half. Findings M1, M9 on this transport.
quic_server._do_handshake_sync was a second, weaker copy of the WebRTC logic:
group_id was optional, so omitting it skipped the membership check entirely and
fell back to the node's first group (M1); node-scoped daemon tokens were
accepted as client tokens (M9); and the checks could drift from the WebRTC path
independently, which is how they diverged in the first place. Authorization now
comes from meshbay_common.handshake, shared with WebRTC.
C6 IS STILL OPEN ON THIS TRANSPORT. There is no GEK proof here yet: a forged or
stolen token still reaches the node over QUIC and can inject chat without
holding the group key. What remains is the challenge/response and the mutual
node proof — quic_binding() is written and unit-tested for exactly this, and
11.5.6 (whether a certificate hash is the right anchor, or an RFC 5705 exporter
is reachable from aioquic) is still unproven. This commit narrows the gap to
the proof itself; it does not close the finding.
QUIC tests updated: default tokens are members of the test group, and clients
pass group_id, since it is mandatory now.
Tests: 9 quic/multi-group, full node+common suite green.
Co-Authored-By: Claude Opus 5 <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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QuicChunkServer/QuicChunkClient: same MNP protocol over QUIC/UDP.
Enables hole-punching (Spike 4 Cone NAT validated). Uses aioquic 1.3.0.
Bug found+fixed: asyncio.Event race condition in client recv loop
(quic_event_received overwrote _stream_events[0] after _recv
created it). Fixed with asyncio.Queue (no shared mutable state).
Server uses synchronous handlers in quic_event_received (avoids
ensure_future transmit timing issue). 3/3 tests. Full suite: 50/50.
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
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