Go HTTP tunnel

Go HTTP tunnel is a reverse tunnel based on HTTP/2. It enables you to share your localhost when you don't have a public IP.

Features:

HTTP proxy with basic authentication
TCP proxy
SNI vhost proxy
Client auto reconnect
Client management and eviction
Easy to use CLI

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
Start tunnel server

$ tunneld -tlsCrt .tunneld/server.crt -tlsKey .tunneld/server.key

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.

Run Server as a Service on Ubuntu using Systemd:

After completing the steps above successfully, create a new file for your service (you can name it whatever you want, just replace the name below with your chosen name).

$ vim tunneld.service

Add the following configuration to the file

[Unit]
Description=Go-Http-Tunnel Service
After=network.target
After=network-online.target

[Service]
ExecStart=/path/to/your/tunneld -tlsCrt /path/to/your/folder/.tunneld/server.crt -tlsKey /path/to/your/folder/.tunneld/server.key
TimeoutSec=30
Restart=on-failure
RestartSec=30

[Install]
WantedBy=multi-user.target

Save and exit this file.
Move this new file to /etc/systemd/system/

$ sudo mv tunneld.service /etc/systemd/system/

Change the file permission to allow it to run.

$ sudo chmod u+x /etc/systemd/system/tunneld.service

Start the new service and make sure you don't get any errors, and that your client is able to connect.

$ sudo systemctl start tunneld.service

You can stop the service with:

$ sudo systemctl stop tunneld.service

Finally, if you want the service to start automatically when the server is rebooted, you need to enable it.

$ sudo systemctl enable tunneld.service

There are many more options for systemd services, and this is by not means an exhaustive configuration file.

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
    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
      tls:
  	    proto: sni
  	    addr: localhost:443
  	    host: tls.my-tunnel-host.com

Configuration options:

server_addr: server TCP address, i.e. 54.12.12.45:5223
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, if empty any server certificate is accepted
tunnels / [name]
- proto: tunnel protocol, http, tcp or sni
- 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, proto=sni) 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
keep_alive**
- idle_time: how long to wait on an idle tcp connection before sending a keepalive packet, default: 15 min
- count: how many keepalive packets to send before declaring that the tcp connection is down, default: 8
- interval: the amount of time to wait between sending consequent keepalive packets, default: 5 sec

** Keep alive configuration not available for window since on windows it can only be either on or off. It is defaulted to on and cannot be turned off via configuration.

How it works

A client opens TLS connection to a server. The server accepts connections from known clients only. The client is recognized by its 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.

The 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.

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

This project is distributed under the AGPL-3 license. See the LICENSE file for details. If you need an enterprice license contact me directly.

mikebaum/go-http-tunnel