tela

README

Tela

Secure remote access to TCP services (SSH, RDP, HTTP, etc.) through an encrypted WireGuard tunnel relayed over WebSocket. No admin privileges or TUN devices required on either end.

graph LR
    Client["Native Client"]
    Tela["tela"]
    Hub["hub.js"]
    Telad["telad"]
    Services["Local Services"]

    Client -->|TCP| Tela
    Tela <-->|"wss (WireGuard inside)"| Hub
    Hub <-->|ws| Telad
    Telad --> Services

    subgraph "WireGuard Tunnel (E2E encrypted)"
        direction LR
        Tela -.-|"gVisor netstack · Curve25519 + ChaCha20"| Telad
    end

How it works

tela (client) and telad (daemon) each create a userspace WireGuard tunnel using gVisor netstack — pure Go, no kernel TUN, no elevated privileges. The hub relays encrypted WireGuard datagrams between them over WebSocket, with automatic upgrades to faster transports when available:

Transport	Path	When
WebSocket	tela → hub → telad	Always works (even through corporate proxies)
UDP relay	tela → hub:41820 → telad	When outbound UDP is open
Direct P2P	tela → telad	When STUN hole-punch succeeds

The hub never sees plaintext — it relays opaque WireGuard ciphertext.

Components

Component	Language	Description
tela	Go	Client — connects to hub, establishes WG tunnel, binds localhost listeners
telad	Go	Daemon — registers with hub, exposes local services through WG tunnel
hub.js	Node.js	Relay — pairs agents with clients, relays WS/UDP, serves hub console

Quick start

Build

go build -o tela ./cmd/tela
go build -o telad ./cmd/telad
cd poc && npm install

Run locally (3 terminals)

# Terminal 1 — Hub
node poc/hub.js

# Terminal 2 — Daemon (exposes SSH + RDP)
./telad -hub ws://localhost:8080 -machine mybox -ports "22,3389"

# Terminal 3 — List machines
./tela machines -hub ws://localhost:8080

# Terminal 3 — Connect to a machine
./tela connect -hub ws://localhost:8080 -machine mybox

Or set environment variables to skip repeating flags:

export TELA_HUB=ws://localhost:8080 TELA_MACHINE=mybox
./tela connect
./tela machines
./tela services

Then connect: ssh localhost or mstsc /v:localhost

Run with Docker (production)

docker compose up --build -d

# With flags:
./tela connect -hub wss://your-hostname -machine barn

# Or with env vars:
export TELA_HUB=wss://your-hostname TELA_MACHINE=barn
./tela connect

See IMPLEMENTATION.md §8 for the full Docker Compose setup and Caddyfile.

Security

• End-to-end encryption: WireGuard (Curve25519 key exchange, ChaCha20-Poly1305 data) between tela and telad. The hub is a blind relay.
• Token authentication: -token flag on both sides; hub validates before pairing.
• No admin required: gVisor netstack operates entirely in userspace — no TUN device, no root/Administrator.
• Outbound-only: Both tela and telad initiate outbound connections to the hub. No inbound ports needed on either end.

Transport upgrade cascade

After the initial WebSocket connection, tela and telad automatically negotiate faster transports:

1. UDP relay — Hub offers a UDP port alongside WebSocket. Both sides probe it; if reachable, WireGuard datagrams switch to UDP (eliminates TCP-over-TCP). Falls back to WebSocket on timeout.
2. Direct tunnel — Both sides perform STUN discovery (RFC 5389) to learn their public IP:port, exchange endpoints via the hub, and attempt simultaneous UDP hole punching. On success, WireGuard datagrams flow peer-to-peer with zero relay overhead.

The cascade is fully automatic. Each tier falls through on failure with no user action.

Project structure

cmd/tela/          Client binary (subcommands: connect, machines, services, status)
cmd/telad/         Daemon binary
internal/wsbind/   WireGuard conn.Bind over WebSocket/UDP/direct
poc/hub.js         Hub relay server
poc/www/           Hub console (web UI)
docker/            Dockerfile and Caddyfile for production

Glossary

Term	Meaning
Hub	Central relay that pairs agents with clients. Serves the hub console.
Hub Console	Web interface for a hub (e.g., https://tela.awansatu.net/).
Agent / telad	Long-lived daemon on a managed machine that registers with the hub.
Client / tela	Binary on the user's laptop that tunnels through the hub to an agent.
Machine	A named resource registered by an agent (e.g., barn).
Service	A TCP endpoint exposed through a machine (e.g., SSH :22, RDP :3389).
Session	An active encrypted tunnel between a client and an agent.
Awan Satu	Cloud platform built on Tela (hub registry, relay, hosted hubs).

Documentation

• DESIGN.md — Architecture specification (includes full glossary)
• IMPLEMENTATION.md — Deployment runbook
• TODO.md — Roadmap
• STATUS.md — Traceability matrix (design → implementation)
• poc/README.md — Detailed CLI reference and troubleshooting

License

Apache 2.0 — see LICENSE.