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Outline Server

This repository has all the code needed to create and manage Outline servers on DigitalOcean. An Outline server runs instances of Shadowsocks proxies and provides an API used by the Outline Manager application.

Go to https://getoutline.org for ready-to-use versions of the software.

Components

The system comprises the following components:

• Outline Server: a proxy server that runs a Shadowsocks example for each access central and a REST API to manage the admission keys. The Outline Server runs in a Docker container in the host motorcar.

  See src/shadowbox

• Outline Manager: an Electron application that can create Outline Servers on the cloud and talks to their access primal management API to manage who has admission to the server.

  Run across src/server_manager

• Metrics Server: a REST service that the Outline Server talks to if the user opts-in to anonymous metrics sharing.

  See src/metrics_server

Code Prerequisites

In order to build and run the code, you need the following installed:

• Node LTS (lts/gallium, version 16.13.0)
• NPM (version eight.ane.0)
• Manager-specic
  • Wine, if you would like to generate binaries for Windows.
• Server-specific
  • Docker, to build the Docker image and to run the integration test.
  • docker-etch, to run the integration examination.

💡 NOTE: if y'all accept nvm installed, run nvm utilize to switch to the correct node version!

Install dependencies with:

This project uses NPM workspaces.

Build Organisation

We have a very simple build arrangement based on bundle.json scripts that are called using npm run and a thin wrapper for what nosotros call build "deportment".

We've divers a package.json script chosen action whose parameter is a relative path:

This control will define a run_action() function and call ${ACTION}.action.sh, which must be. The called activity script can apply run_action to telephone call its dependencies. The $ACTION parameter is always resolved from the project root, regardless of the caller location.

The idea of run_action is to continue the build logic next to where the relevant code is. Information technology too defines two environmental variables:

• ROOT_DIR: the root directory of the projection, as an absolute path.
• BUILD_DIR: where the build output should go, as an accented path.

⚠️ To find all the deportment in this project, run npm run activity:list

Build output

Building creates the following directories under build/:

• web_app/: The Manager web app.
  • static/: The standalone web app static files. This is what ane deploys to a web server or runs with Electron.
• electron_app/: The launcher desktop Electron app
  • static/: The Manager Electron app to run with the electron control-line
  • bundled/: The Electron app bundled to run standalone on each platform
  • packaged/: The Electron app bundles packaged as single files for distribution
• invite_page: the Invite Page
  • static: The standalone static files to be deployed
• shadowbox: The Proxy Server

The directories take subdirectories for intermediate output:

• ts/: Autogenerated Typescript files
• js/: The output from compiling Typescript lawmaking
• browserified/: The output of browserifying the JavaScript lawmaking

To make clean up:

Shadowsocks Resistance Against Detection and Blocking

Shadowsocks used to be blocked in some countries, and because Outline uses Shadowsocks, in that location has been skepticism most Outline working in those countries. In fact, people have tried Outline in the past and had their servers blocked.

However, since the second half of 2020 things have changed. The Outline team and Shadowsocks community fabricated a number of improvements that strengthened Shadowsocks beyond the censor's current capabilities.

As shown in the enquiry How China Detects and Blocks Shadowsocks, the censor uses active probing to discover Shadowsocks servers. The probing may exist triggered by packet sniffing, but that's non how the servers are detected.

Even though Shadowsocks is a standard, it leaves a lot of room for choices on how it's implemented and deployed.

First of all, you must use AEAD ciphers. The old stream ciphers are easy to break and manipulate, exposing you to simple detection and decryption attacks. Outline has banned all stream ciphers, since people copy erstwhile examples to set up their servers. The Outline Manager goes farther and picks the cipher for you, since users don't usually know how to choose a cipher, and it generates a long random secret, and then you are not vulnerable to lexicon-based attacks.

Second, you demand probing resistance. Both shadowsocks-libev and Outline have added that. The research Detecting Probe-resistant Proxies showed that, in the past, an invalid byte would trigger different behaviors whether it was inserted in positions 49, fifty or 51 of the stream, which is very telling. That beliefs is now gone, and the censor tin no longer rely on that.

Third, you need protection confronting replayed data. Both shadowsocks-libev and Outline have added such protection, which you may need to enable explicitly on ss-libev, merely it'southward the default on Outline.

Fourth, Outline and clients using shadowsocks-libev now merge the SOCKS address and the initial data in the aforementioned initial encrypted frame, making the size of the first packet variable. Before the starting time packet just had the SOCKS accost, with a fixed size, and that was a giveaway.

The censors used to block Shadowsocks, but Shadowsocks has evolved, and equally for 2021, it's ahead over again in the cat and mouse game.

Shadowsocks remains our protocol of option because it's simple, well understood and very performant. Furthermore, it has an enthusiastic community of very smart people behind it.

Source: https://github.com/Jigsaw-Code/outline-server

Posted by: mosleylerning.blogspot.com

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