Tunnel

Tunnel enables you to share your localhost when you don't have a public IP.

Features:

• HTTP proxy
• HTTP basic authentication
• TCP proxy
• Auto reconnect using backoff strategy
• Dynamic client management and eviction
• Go http.Handler and http.RoundTripper implementations

How it works:

Client opens a TLS connection to a server. Server accepts connections from known clients only, client is recognised by it's TLS certificate ID. The server is publicly available and proxies incoming connections to the client. Then the connection is further proxied in the client's network.

Tunnel is based HTTP/2 for speed and security. There is a single TCP connection between client and server and all the proxied connections are multiplexed using HTTP/2.

Common use cases:

• Hosting a game server from home
• Developing webhook integrations
• Managing IoT devices

Installation

Build the latest version.

$ go get -u github.com/mmatczuk/go-http-tunnel/cmd/...

Alternatively download the latest release.

Running

There are two executables:

• tunneld - the tunnel server, to be run on publicly available host like AWS or GCE
• tunnel - the tunnel client, to be run on your local machine or in your private network

To get help on the command parameters run tunneld -h or tunnel -h.

Tunnel requires TLS certificates for both client and server.

$ openssl req -x509 -nodes -newkey rsa:2048 -sha256 -keyout client.key -out client.crt
$ openssl req -x509 -nodes -newkey rsa:2048 -sha256 -keyout server.key -out server.crt

Run client:

• Install tunnel binary
• Make .tunnel directory in your project directory
• Copy client.key, client.crt to .tunnel
• Create configuration file tunnel.yml in .tunnel
• Start all tunnels

$ tunnel -config ./tunnel/tunnel.yml start-all

Run server:

• Install tunneld binary
• Make .tunneld directory
• Copy server.key, server.crt to .tunneld
• Get client identifier (tunnel -config ./tunnel/tunnel.yml id), identifier should look like this YMBKT3V-ESUTZ2Z-7MRILIJ-T35FHGO-D2DHO7D-FXMGSSR-V4LBSZX-BNDONQ4
• Start tunnel server

$ tunneld -tlsCrt .tunneld/server.crt -tlsKey .tunneld/server.key -clients YMBKT3V-ESUTZ2Z-7MRILIJ-T35FHGO-D2DHO7D-FXMGSSR-V4LBSZX-BNDONQ4

This will run HTTP server on port 80 and HTTPS (HTTP/2) server on port 443. If you want to use HTTPS it's recommended to get a properly signed certificate to avoid security warnings.

Configuration

The tunnel client tunnel requires configuration file, by default it will try reading tunnel.yml in your current working directory. If you want to specify other file use -config flag.

Sample configuration that exposes:

• localhost:8080 as webui.my-tunnel-host.com
• host in private network for ssh connections

looks like this

    server_addr: SERVER_IP:5223
    insecure_skip_verify: true
    tunnels:
      webui:
        proto: http
        addr: localhost:8080
        auth: user:password
        host: webui.my-tunnel-host.com
      ssh:
        proto: tcp
        addr: 192.168.0.5:22
        remote_addr: 0.0.0.0:22

Configuration options:

• server_addr: server TCP address, i.e. 54.12.12.45:5223
• insecure_skip_verify: controls whether a client should skip the verification of the server's certificate chain and host name. If set to true the client will accept any server certificate as valid, default: false
• tls_crt: path to client TLS certificate, default: client.crt in the config file directory
• tls_key: path to client TLS certificate key, default: client.key in the config file directory
• root_ca: path to trusted root certificate authority pool file, default is the host's root CA set
• tunnels / [name]
  • proto: tunnel protocol, http or tcp
  • addr: forward traffic to this local port number or network address, for proto=http this can be full URL i.e. https://machine/sub/path/?plus=params, supports URL schemes http and https
  • auth: (proto=http) (optional) basic authentication credentials to enforce on tunneled requests, format user:password
  • host: (proto=http) hostname to request (requires reserved name and DNS CNAME)
  • remote_addr: (proto=tcp) bind the remote TCP address
• backoff
  • interval: how long client would wait before redialing the server if connection was lost, exponential backoff initial interval, default: 500ms
  • multiplier: interval multiplier if reconnect failed, default: 1.5
  • max_interval: maximal time client would wait before redialing the server, default: 1m
  • max_time: maximal time client would try to reconnect to the server if connection was lost, set 0 to never stop trying, default: 15m

Donation

If this project help you reduce time to develop, you can give me a cup of coffee.

A GitHub star is always appreciated!

License

Copyright (C) 2017 Michał Matczuk

This project is distributed under the BSD-3 license. See the LICENSE file for details.