Add tcp-tls transport and tunnel protocol disguised as HTTPS
Implement the `tcp-tls` protocol crate and generic tunnel codec abstractions alongside `wg-quic` to circumvent deep packet inspection (DPI/TSPU), UDP blocking, and QUIC throttling. Traffic uses standard TCP on port 443 with TLS 1.3 framing, looking identical to regular HTTPS traffic to network observers. Architectural highlights: - TunnelCodec & GenericTunnelPlugin: Provide an extensible plugin abstraction in `crates/tsunagi/src/dataplane/tunnel.rs` that encapsulates background task lifecycles, per-peer channels, and sink dispatch, so new transport plugins only define cryptographic transformations and handshake payloads. - MultiPacketTransport & Protocol Priority Selection: Support multiple simultaneous transports in `AgentConfig` and dynamically dispatch `open()` calls by protocol identifier. In `ensure_links`, choose the highest-priority mutually supported protocol per peer to avoid duplicate links. - TLS 1.3 & Certificate Pinning: Generate self-signed Ed25519 X.509 certificates derived from the persistent `DeviceIdentity` secret. Clients pin peer certificates using `PinnedEndpointVerifier` against `iroh::EndpointId`. - End-to-end Encryption: `PeerCipher` uses X25519 static-static ECDH, HKDF-SHA256, and ChaCha20-Poly1305 with incrementing 64-bit nonces. Relayed traffic across intermediate nodes remains confidential and tamper-proof. - Privilege handling: Default to TCP port 443 with fallback to 8443 on `PermissionDenied`, providing an actionable message recommending: `sudo setcap cap_net_admin,cap_net_bind_service+p <path>`. Validation on Linux: - `cargo fmt --all -- --check` passed. - `cargo clippy --locked --workspace --all-targets -- -D warnings` passed. - `cargo test --locked --workspace --all-targets` passed (all workspace unit, integration, CLI, and new `tsunagi-tcp-tls` tests passed).
This commit is contained in:
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