xah30
65b26b555d
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>
110 lines
5.0 KiB
TOML
110 lines
5.0 KiB
TOML
# Aura VPN client configuration (project §9).
|
|
# Copy to client.toml and adjust. Paths may begin with `~` (expands to your home directory).
|
|
|
|
[client]
|
|
# Human-readable client name / id.
|
|
name = "laptop"
|
|
# Server UDP socket address.
|
|
server_addr = "203.0.113.10:443"
|
|
# Outer-TLS SNI (camouflage hostname) presented to the server. Also the name verified
|
|
# inside the Aura handshake against the server certificate's SAN.
|
|
sni = "cdn.example.com"
|
|
# Optional: drop privileges to this non-root user AFTER the TUN device has been brought up.
|
|
# Recommended when `aura client` is launched via sudo so the long-running router loop runs
|
|
# as an ordinary user. Linux uses setresuid/setresgid; macOS uses setgid/setuid; Windows is a
|
|
# no-op (use a service account instead). When omitted (or already running as non-root) no
|
|
# privilege change happens.
|
|
# run_as = "nobody"
|
|
|
|
[pki]
|
|
# Trust anchor (the Aura CA) and this client's leaf cert/key, all PEM.
|
|
# Issue with: aura pki issue-client --id laptop --out ~/.aura --ca ~/.aura
|
|
ca_cert = "~/.aura/ca.crt"
|
|
cert = "~/.aura/client.crt"
|
|
key = "~/.aura/client.key"
|
|
|
|
[tunnel]
|
|
# Requested TUN interface name (advisory on macOS, where the kernel assigns utunN).
|
|
tun_name = "aura0"
|
|
# Local address assigned to the TUN device, and its prefix length.
|
|
local_ip = "10.7.0.2"
|
|
prefix = 24
|
|
# TUN MTU.
|
|
mtu = 1420
|
|
# Tunnel resolver DNS (informational; the system resolver is used in v1).
|
|
dns = "10.7.0.1"
|
|
|
|
# Split-tunnel routing: the default action plus per-destination overrides.
|
|
[tunnel.split]
|
|
# Default for destinations matching no rule below: "VPN" or "DIRECT".
|
|
default = "VPN"
|
|
|
|
# Send these directly (bypass the tunnel): RFC1918 ranges stay on the LAN...
|
|
[[tunnel.split.direct]]
|
|
cidr = "192.168.0.0/16"
|
|
|
|
[[tunnel.split.direct]]
|
|
cidr = "10.0.0.0/8"
|
|
|
|
# ...and a corporate domain egresses directly (resolved to host routes at startup).
|
|
[[tunnel.split.direct]]
|
|
domain = "intranet.example.com"
|
|
|
|
# Force a more-specific range back through the VPN (longest-prefix wins over 10.0.0.0/8).
|
|
[[tunnel.split.vpn]]
|
|
cidr = "10.7.0.0/24"
|
|
|
|
# v2: OS-level split-tunnel routing. With `enabled = true` (the default) the client programs the
|
|
# system routing table at startup so DIRECT destinations bypass the TUN entirely — they continue
|
|
# to use the host's original default gateway, while only VPN-classified traffic reaches the
|
|
# tunnel. This eliminates the v1 user-space `send_direct` stub, where DIRECT packets were merely
|
|
# logged and dropped. The guard is RAII: the routes are rolled back when `aura client` exits.
|
|
#
|
|
# Linux: uses `ip route add ... via <gw> dev <egress>` for bypasses and `ip route add ... dev <tun>`
|
|
# for the VPN default; the VPN default carries metric 50 so it wins over DHCP-installed defaults.
|
|
# macOS: uses `route add -net <cidr> <gw>` for bypasses and `route add -net <cidr> -interface <tun>`
|
|
# for VPN routes.
|
|
# Windows: not implemented in v1 (the section is parsed but the install is a logged no-op).
|
|
[tunnel.os_routes]
|
|
# Master switch. `false` falls back to the v1 user-space router (the `send_direct` path drops
|
|
# DIRECT packets; kept intentionally as a fallback). Default: true.
|
|
enabled = true
|
|
# When `true`, every routing command is only logged (`would run: ...`) and not executed —
|
|
# useful for testing the plan without root. Default: false.
|
|
dry_run = false
|
|
# Optional explicit IPv4 default gateway. When omitted, auto-detected (Linux:
|
|
# `ip route show default`; macOS: `route -n get default`).
|
|
# gateway = "192.168.1.1"
|
|
# Optional explicit egress interface name (e.g. "eth0" on Linux, "en0" on macOS). When omitted,
|
|
# auto-detected alongside the gateway.
|
|
# egress_iface = "en0"
|
|
|
|
[mimicry]
|
|
# Enable traffic padding to blend packet sizes into HTTPS buckets.
|
|
padding = false
|
|
|
|
[transport]
|
|
# Fallback order tried left-to-right ("handover"): the first transport that connects wins. Aura's
|
|
# own UDP transport is primary; TCP/443 and QUIC (HTTP/3 mimicry) are fallbacks for networks that
|
|
# throttle or block plain UDP. Omitting this whole section uses ["udp","tcp","quic"] on 443/443/444.
|
|
order = ["udp", "tcp", "quic"]
|
|
# Per-transport server ports. The server IP comes from [client] server_addr above (its port there is
|
|
# ignored). The UDP transport and QUIC both ride UDP, so udp_port and quic_port MUST differ; TCP may
|
|
# reuse the UDP port number.
|
|
udp_port = 443
|
|
tcp_port = 443
|
|
quic_port = 444
|
|
# UDP: pad datagrams up to HTTPS size buckets to blur the on-wire size distribution.
|
|
obfuscate = true
|
|
# TCP: prepend a minimal HTTP/1.1 preamble (Host = [client] sni) so the open resembles plain HTTP.
|
|
masquerade = true
|
|
|
|
[transport.masks]
|
|
# Daily protocol-mask rotation. When `true`, every day at 05:00 MSK (= 02:00 UTC) the client
|
|
# derives a new (SNI, User-Agent, Server-header, padding-profile) tuple from
|
|
# HKDF-SHA256(CA-fingerprint, MSK-date) and uses it for any subsequent connect — the server derives
|
|
# the same tuple independently from the same CA fingerprint, so no wire coordination is needed.
|
|
# Existing connections keep the mask they connected with. Default: true.
|
|
# When `false`, the static values above ([client] sni, [transport] obfuscate, ...) are used as-is.
|
|
enabled = true
|