xah30
c95e1a482c
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>
79 lines
3.1 KiB
TOML
79 lines
3.1 KiB
TOML
# Aura VPN client configuration (project §9).
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# Copy to client.toml and adjust. Paths may begin with `~` (expands to your home directory).
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[client]
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# Human-readable client name / id.
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name = "laptop"
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# Server UDP socket address.
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server_addr = "203.0.113.10:443"
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# Outer-TLS SNI (camouflage hostname) presented to the server. Also the name verified
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# inside the Aura handshake against the server certificate's SAN.
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sni = "cdn.example.com"
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[pki]
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# Trust anchor (the Aura CA) and this client's leaf cert/key, all PEM.
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# Issue with: aura pki issue-client --id laptop --out ~/.aura --ca ~/.aura
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ca_cert = "~/.aura/ca.crt"
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cert = "~/.aura/client.crt"
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key = "~/.aura/client.key"
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[tunnel]
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# Requested TUN interface name (advisory on macOS, where the kernel assigns utunN).
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tun_name = "aura0"
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# Local address assigned to the TUN device, and its prefix length.
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local_ip = "10.7.0.2"
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prefix = 24
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# TUN MTU.
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mtu = 1420
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# Tunnel resolver DNS (informational; the system resolver is used in v1).
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dns = "10.7.0.1"
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# Split-tunnel routing: the default action plus per-destination overrides.
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[tunnel.split]
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# Default for destinations matching no rule below: "VPN" or "DIRECT".
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default = "VPN"
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# Send these directly (bypass the tunnel): RFC1918 ranges stay on the LAN...
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[[tunnel.split.direct]]
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cidr = "192.168.0.0/16"
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[[tunnel.split.direct]]
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cidr = "10.0.0.0/8"
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# ...and a corporate domain egresses directly (resolved to host routes at startup).
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[[tunnel.split.direct]]
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domain = "intranet.example.com"
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# Force a more-specific range back through the VPN (longest-prefix wins over 10.0.0.0/8).
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[[tunnel.split.vpn]]
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cidr = "10.7.0.0/24"
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[mimicry]
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# Enable traffic padding to blend packet sizes into HTTPS buckets.
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padding = false
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[transport]
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# Fallback order tried left-to-right ("handover"): the first transport that connects wins. Aura's
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# own UDP transport is primary; TCP/443 and QUIC (HTTP/3 mimicry) are fallbacks for networks that
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# throttle or block plain UDP. Omitting this whole section uses ["udp","tcp","quic"] on 443/443/444.
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order = ["udp", "tcp", "quic"]
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# Per-transport server ports. The server IP comes from [client] server_addr above (its port there is
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# ignored). The UDP transport and QUIC both ride UDP, so udp_port and quic_port MUST differ; TCP may
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# reuse the UDP port number.
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udp_port = 443
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tcp_port = 443
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quic_port = 444
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# UDP: pad datagrams up to HTTPS size buckets to blur the on-wire size distribution.
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obfuscate = true
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# TCP: prepend a minimal HTTP/1.1 preamble (Host = [client] sni) so the open resembles plain HTTP.
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masquerade = true
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[transport.masks]
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# Daily protocol-mask rotation. When `true`, every day at 05:00 MSK (= 02:00 UTC) the client
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# derives a new (SNI, User-Agent, Server-header, padding-profile) tuple from
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# HKDF-SHA256(CA-fingerprint, MSK-date) and uses it for any subsequent connect — the server derives
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# the same tuple independently from the same CA fingerprint, so no wire coordination is needed.
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# Existing connections keep the mask they connected with. Default: true.
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# When `false`, the static values above ([client] sni, [transport] obfuscate, ...) are used as-is.
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enabled = true
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