Atun - AWS Tagged Tunnel

Secure tunneling doesn't have to be hard or annoying: atun is a tiny cli tool which works based on remote configuration. It uses tags to define hosts and ports forwarding endpoints. atun.io/ schema namespace is used to easily configure endpoints.

Demo

atun up

atun down

Note

While the tool works, it is still in development and versions before 1.0.0 might have breaking changes. Be ready that commits might be squashed/reset and tags might be rewritten until 1.0.0

Quickstart

Install with Homebrew

brew tap DimmKirr/tap
brew install atun

Install with Scoop

scoop bucket add DimmKirr https://github.com/DimmKirr/scoop-bucket.git
scoop install atun

Features

This tool allows to connect to private resources (RDS, Redis, etc) via routers.

EC2 Router

This is the only router type available at the moment. It uses EC2 instances with atun.io schema tags to forward ports to the local machine. It doesn't require a public IP, since it uses SSM.

Tag Metadata Schema

In order for the tool to work your EC2 host must emply correct tag schema. At the moment it has two types of tags: Atun Version and Atun Host.

• Version Tag Name = atun.io/version
• Version Tag Value = <schema_version>
• Env Tag Name = atun.io/env
• Env Tag Value = <environment_name>
• Host Tag Name = atun.io/host/<hostname>
• Host Tag Value = {"local":"<local_port>","proto":"<protocol>","remote":<remote_port>}

endpoints config Description

• local: port that would be bound on a local machine (your computer)
• proto: protocol of forwarding (only ssm for now, but might be k8s or cloudflare)
• remote: port that is available on the internal network to the router host.

Example

AWS Tag	Value	Description
atun.io/version	1	Schema Version. It might change if significant changes would be intoduced
atun.io/env	dev	Specified environment of the router host
atun.io/host/nutcorp-api.cluster-xxxxxxxxxxxxxxx.us-east-1.rds.amazonaws.com	{"local":"23306","proto":"ssm","remote":3306}	Describes endpoints config and how to forward ports for a MySQL RDS
atun.io/host/nutcorp.xxxxxx.0001.use0.cache.amazonaws.com	{"local":"26379","proto":"ssm","remote":6379}	Describes endpoints config and how to forward ports for ElastiCache Redis

Usage

There are two ways to use this tool: when an infra has a router with atun.io schema tags and when it doesn't have it yet.

Manage Router Endpoints

Atun uses "routers" (such as EC2 routers) to establish secure connections to your infrastructure.

Create a Router

atun router create

List Available Routers

atun router ls

Connect to a Router

For troubleshooting or direct access:

atun router shell

A relevant protocol will be used, such as SSM.

Delete a Router

atun router delete

Bring up a tunnel

This will bring up a tunnel via existing atun.io router

atun up

Bring down a tunnel

atun down

Check the status of the tunnel

atun status

Create a router and connect in one go

atun up --create

Bring down a tunnel and delete ad-hoc router

atun down --delete

Development & Contributing

Install from Homebrew (dev version)

brew tap DimmKirr/tap
brew install atun --build-from-source

If the dev version has cached old metadata (b/c version is the same), use this command:

brew update && brew fetch --force atun && brew reinstall atun

Roadmap

• Kubernetes (via annotations & ssh pod)
• AWS EC2 Instance connect