The TCP fallback now does a full outer TLS handshake (tokio-rustls 0.26 over
rustls 0.23, ring provider) before the Aura proto handshake, exactly like the
QUIC backend: on the wire it is indistinguishable from genuine HTTPS until the
inner Aura mutual-auth handshake starts. Removes v1's "light HTTP masquerade"
limitation; the real security boundary remains the inner PQ handshake.
- aura-transport::tcp: dropped the HTTP/1.1 preamble helpers and TcpOpts
fields (masquerade, host, user_agent, server_header). New flow:
TlsAcceptor::accept (server) / TlsConnector::connect (client) →
tokio::io::split(TlsStream) → server_handshake / client_handshake → Session.
Client reuses crate::quic::AcceptAnyServerCert (outer SNI not authenticated;
inner handshake is the security boundary). Outer server cert auto-sourced
from proto_cfg.server_cert_pem (no API change for the CLI's bind).
- ALPN default: ["h2", "http/1.1"] (DEFAULT_TCP_ALPN, exported).
- TcpOpts: now just { alpn: Option<Vec<Vec<u8>>> }.
- TcpClient::connect gains an outer-SNI &str param; DialConfig.sni passes it
through (separate from the inner proto_cfg.server_name).
- tokio-rustls 0.26 added as a transport-local dependency (not workspace).
CLI updates: removed dead host/user_agent/server_header wiring; mask rotation
no longer touches TCP outer parameters (TLS doesn't have a Host header on
the wire). [transport] masquerade kept as a no-op for back-compat with old
configs (documented).
3 new tcp_loopback tests (default ALPN end-to-end, custom ALPN, outer SNI
mismatch still connects = proves accept-any is in effect). Workspace: 142
tests passed (+1), clippy -D warnings clean, fmt clean.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Both server and client deterministically rotate the on-wire obfuscation mask
(SNI, HTTP Host/User-Agent/Server headers, UDP padding profile) at 05:00 Moscow
time (02:00 UTC) every day, derived from the CA fingerprint + UTC date — no
network coordination needed.
- aura-crypto::masks: MaskSet + 4 palettes (16 SNI, 10 UA, 5 Server, 4 padding
profiles); derive_mask_for_msk_date via HKDF-SHA256(salt="aura-mask-v1-salt",
ikm=ca_fp||"YYYY-MM-DD", info="aura-mask-v1"); ca_fingerprint with built-in
base64 PEM decode (no new deps).
- aura-cli::masks: MaskRotator (Arc<RwLock<MaskSet>>) + Hinnant's civil_from_days
for manual UTC date math; scheduler picks next 02:00 UTC strictly (avoids
busy-loop at boundary); spawned at startup in server::run/client::run.
- aura-transport: PADDING_PROFILES + next_bucket_for_profile (profile 0 byte-for-
byte equals legacy pad_to_https_size); TcpOpts gains user_agent/server_header;
UdpOpts gains padding_profile; MultiServer holds Arc<UdpServer>/Arc<TcpServer>
with set_udp_opts/set_tcp_opts so rotation propagates without restart.
- Backward-compatible: defaults preserve previous behavior; existing 97 tests
unchanged. 17 new tests (derive determinism + date variation, civil-from-days
known points incl. 1970-01-01/2000-02-29/2024->2025, next-rotation boundary,
msk_today offset, profile equivalence, base64 round-trip, full mask-driven
UDP loopback). Total: 114 passed, clippy/fmt clean. No new workspace deps.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- tcp.rs: Aura proto handshake + Session directly over TcpStream (TcpServer/
TcpClient/TcpConnection: PacketConnection), with an optional light HTTP/1.1
masquerade preamble. Fallback for UDP-blocking networks. (Full TLS-443 mimicry
is a documented follow-up.)
- dial.rs: TransportMode {Udp,Tcp,Quic}, Endpoints, DialConfig; client `dial()`
tries transports in order and hands over on failure/timeout; MultiServer binds
and accepts on every enabled transport at once (TCP/QUIC multi-client; UDP
single-peer-per-accept in v1).
- Tests: tcp loopback (plain + masquerade), dial handover (dead TCP -> UDP).
clippy/fmt clean.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
xah30