Completes v3.1 multi-hop / onion routing (2 hops: client → entry-relay →
exit-server). Combined with the scaffold commit (6c14c0d), the property
holds: entry-relay knows the client IP + client_id but cannot decrypt the
data; exit knows the destination but sees the relay's IP as source.
- aura-cli::circuit: dial_circuit(&[entry, exit], proto_cfg, udp_opts) →
CircuitConnection. Connects to entry as a normal UdpClient, sends an
ExtendBridge control envelope, awaits CircuitReady, then runs a SECOND
Aura handshake to the exit through a local loopback UDP proxy — the
forwarder ferries datagrams between that proxy socket and the outer
relay PacketConnection. The inner handshake therefore authenticates the
EXIT cert (verified by the integration test asserting
circuit.peer_id() == "localhost-exit"); the relay never sees the inner
session keys.
- aura-cli::relay: rendezvous(conn, whitelist) -> Bridged{bridge} |
Fallback{first_pkt} | Refused. 2-second window after handshake to receive
ExtendBridge. Whitelist enforced; CircuitFailed on miss. Empty whitelist
logs a warning and runs open. Timeout / non-control → Fallback so the
same server can be both relay (for circuit clients) and exit (for direct
clients) simultaneously.
- aura-cli::client: when [client.circuit] enabled → dial_circuit; falls
back to normal aura_transport::dial when disabled.
- aura-cli::server: relay rendezvous wired before pool/CRL/router path.
run_bridge spawns two forwarder tasks (conn↔bridge UDP socket).
- 3 integration tests: end-to-end (with peer_id assertion), whitelist
rejection, back-compat (relay disabled → Err). 3 unit tests in relay.rs.
Workspace: 253 tests passed (247 baseline + 6 new), clippy -D warnings clean,
fmt clean. No new workspace deps. All 28 tracked tasks (v1 + v2 + v3.1) now
complete.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Foundation for v3.1 onion routing (client → entry-relay → exit-server).
The relay/circuit runtime is implemented in a follow-up commit; this
scaffold lands the wire-level control extensions and the config schema:
- aura-proto: ControlKind gains ExtendBridge (client→relay), CircuitReady
(relay→client), CircuitFailed (relay→client, with utf-8 reason); helpers
encode_extend_bridge / decode_extend_bridge (1-byte family + 4/16 addr
bytes + u16 port). Integration test in tests/control_extend.rs covers
IPv4/IPv6 roundtrip + full magic-envelope wrap.
- aura-cli config: [server.relay] {enabled, allow_extend_to} +
[client.circuit] {enabled, hops} sections; relay_whitelist() helper
parses IP:port literals. All new fields serde-default, back-compat.
- crl_push.rs touched only to leave the new ControlKinds passing through
the existing magic-envelope dispatcher unchanged.
Workspace: 247 tests passed (+12), clippy/fmt clean.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Server now pushes its signed CRL to each connecting client right after the
handshake; the client verifies the signature against the CA and applies the
revocation list to its verifier (and caches it on disk for restarts).
Removes the v1 "CRL distributed out-of-band" honest limitation.
Wire (multiplexed over existing PacketConnection, no trait change):
control envelope = MAGIC[4]=[0xAA,0xAA,0xC0,0x01] || kind(u8) || u32_be(len)
|| payload. IPv4/IPv6 start with 0x4X/0x6X, so 0xAA cannot collide; an old
peer just drops it as a junk packet in the TUN — back-compat preserved.
- aura-proto: ControlKind { CrlPush, CrlAck, Unknown }, encode/decode_control_
envelope, CONTROL_ENVELOPE_MAGIC; 7 frame tests.
- aura-pki: CrlStore::{encode_signed, save_signed, decode_signed_verified,
load_signed_verified} — ECDSA-P256/SHA-256 from the CA private key against
a textual "CRL-Aura-v1" body + --SIGNATURE--; 7 signing tests. ring 0.17
added crate-local (already in lockfile via rustls-webpki).
- aura-cli: crl_push module — server pushes via conn.send_packet on accept;
client wraps the Arc<dyn PacketConnection> in AcceptPushedCrlConn which
sniffs the magic in recv_packet, verifies the signature, updates the
AuraCertVerifier, caches to disk. PkiSection gets ca_key, crl_push (default
true), accept_pushed_crl (default true).
- 5 in_band_crl integration tests via mock PacketConnection.
Workspace: 235 tests passed (+28), clippy -D warnings clean, fmt clean. v2
COMPLETE — all 9 honest v1 limitations resolved (except sing-box, per user).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Reduces manual setup steps and trims user-identifying data exposed by the
server/client, in the spirit of the deployment story: an operator on the
wire sees less, and the admin types fewer commands.
New CLI subcommands:
- `aura server-init`: one shot — pki init + issue-server + writes a ready
server.toml with auto-detected egress iface; flags --enable-knock,
--enable-cover-traffic, --no-nat, --run-as toggle the new transport
defenses and privilege drop.
- `aura provision-client`: issues a client cert and assembles the full
bundle (ca.crt + client.crt + client.key + client.toml in one directory)
ready to hand over to the client device. --id is optional (defaults to
a fresh UUIDv4, so client identities don't have to encode anything real).
Identity / log minimization:
- `aura pki issue-client --id` is now optional — UUIDv4 by default.
- `[server]/[client] no_logs = true` filters peer_id, client_ip,
source_addr, client_id, local_ip, user, id, assigned_ip, peer field
values through a custom tracing FormatFields layer (events still fire
but the identifying fields are redacted before being written).
- `[client] bridges = [...]`: secondary server addresses; build_dial_targets
shuffles them after the primary, so blocking one IP doesn't kill the
client.
- Auto-detect egress iface in [server.nat] (via detect_default_egress_iface);
egress_iface in config becomes optional with graceful fallback.
Config examples updated; backward-compatible (all new sections optional with
serde defaults). Workspace: 207 tests passed (+22), clippy -D warnings clean,
fmt clean. No new workspace deps.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
DIRECT-destination traffic now bypasses the TUN entirely via OS routing
table edits, instead of going through user-space and hitting the v1
send_direct stub. The user-space router only sees VPN-bound packets,
making the split-tunnel real.
- aura_cli::os_routes::OsRouteGuard: RAII install + rollback of OS routes.
Linux: `ip route show default` parser -> DIRECT CIDRs via original gw,
VPN default via TUN with metric 50. macOS: `route -n get default`
parser -> `route add -net/-host ... <gw>` for DIRECT, `route add -net
... -interface <tun>` for VPN. Windows: stub + warning (v3).
- dry_run works on every platform (logs `would run: ...`); useful for
tests and operator confidence-checks.
- SplitRoutes::from_config folds [[tunnel.split.direct]]/[[...vpn]] +
resolved domains (via AuraDns) into one declarative plan.
- New [tunnel.os_routes] {enabled (default true), dry_run, gateway,
egress_iface}; absent section = old user-space behavior (back-compat).
- client::run installs routes after AuraTun::create, before privdrop;
guard's Drop reverts everything on shutdown.
- aura-tunnel::router unchanged; AuraRouter::send_direct kept as a
defensive fallback (in v2 it should never fire — OS routes prevent
DIRECT packets from reaching the TUN at all).
20 new tests (linux/macos parser unit tests, install dry-run, config
back-compat). Workspace: 174 tests passed (+19), clippy -D warnings
clean, fmt clean.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Three v2-hardening features in aura-cli, one pass:
- nat::NatGuard: RAII auto-config of IP forwarding + MASQUERADE on server
startup. Linux (sysctl ip_forward + iptables -t nat MASQUERADE) and
macOS (sysctl ip.forwarding + pfctl with /tmp/aura-nat.conf). dry_run
works on every platform (logs "would run: ..."). Reverts everything in
Drop. New [server.nat] {auto, egress_iface, dry_run}; absent section =
back-compat no-op. Removes v1's "manual NAT/forwarding" step.
- privdrop::drop_to_user: drop euid/gid after binding TUN + privileged
ports. Linux setresuid/setresgid, macOS setgid+setuid (permanent drop),
Windows no-op with warning. New [server] / [client] run_as = "..."
(optional). Skipped with info-log if already non-root.
- admin: split transport into cfg(unix) Unix-socket and cfg(windows) Tokio
named-pipe modules sharing one JSON-line serve/request flow over
AsyncRead/AsyncWrite. DEFAULT_SOCKET = "/tmp/aura-admin.sock" on Unix,
r"\\.\pipe\aura-admin" on Windows. Removes v1's "admin Unix-only".
Deps: nix 0.29 user feature under [target.'cfg(unix)'.dependencies] (cli-
local, not workspace). Workspace: 155 tests passed (+13), clippy -D warnings
clean, fmt clean.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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>
Server now assigns each connected client an IP from a configurable pool and
maintains a client_ip -> AuraConnection map so packets read from the shared
TUN are dispatched to the right client (and each client's recv loop writes
back to the TUN). Removes v1's "single shared TUN, no NAT/pool" limitation;
turns the server into a proper multi-client VPN concentrator (paired with the
already-landed UDP multi-client demux).
- aura_cli::pool: IpPool + PoolStrategy {StaticOnly, DynamicOnly,
StaticOrDynamic}; reserves network/broadcast/server-own IP; 15 tests.
- aura_cli::server_router: ServerRouter + ServerRoutes (Arc<RwLock<HashMap>>);
central TUN read loop dispatching by dst_ip; spawn_inbound_forwarder per
conn auto-unregisters and releases the IP on disconnect; 4 tests via
MockTun + MockConn.
- aura_cli::config: [server.pool] {cidr, strategy, static} added with
serde(default); legacy configs (only [tunnel] pool_cidr) fall back to a
DynamicOnly pool (backward compatible, tested).
- aura_cli::server: accept loop now: pool.assign(peer_id) -> register ->
spawn_inbound_forwarder; rejected static_only mismatches dropped+logged.
- config/server.toml.example: documented [server.pool] section.
Workspace: 141 tests passed (+24), clippy -D warnings clean, fmt clean. No
new workspace deps (async-trait added to cli dev-deps for mock traits in tests).
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>
aura-cli: clap command tree (pki init/issue-server/issue-client/revoke/list,
server, client, route add/list/remove, status, bench-crypto); TOML config with
~ expansion and split-tunnel rules -> RouteTable; JSON-over-Unix-socket admin
IPC; server/client data paths wiring transport + tunnel (TUN run needs root).
config/{server,client}.toml.example. 15 tests (pki roundtrip, config parse,
admin-socket roundtrip, loopback connection). Verified the real binary: --help,
bench-crypto, and a full CA->server->client cert workflow.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
- 6-crate Cargo workspace, dependency tree frozen (cargo check green in ~1m)
- ml-kem 0.3 (FIPS 203) replaces spec's pqcrypto-kyber for ML-KEM-768
- fix invalid target-gated workspace.dependencies: Windows deps (wintun/windows)
declared untargeted, cfg-gated per-crate in aura-tunnel
- version bumps vs spec: tun 0.8, rcgen 0.14, wintun 0.5
- stub lib/main per crate; real implementations land wave by wave
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
xah30