SWAG

A guide on integrating Authelia with SWAG.

SWAG is a reverse proxy supported by Authelia. It’s an NGINX proxy container with bundled configurations to make your life easier.

Important: When using these guides it’s important to recognize that we cannot provide a guide for every possible method of deploying a proxy. These guides show a suggested setup only and you need to understand the proxy configuration and customize it to your needs. To-that-end we include links to the official proxy documentation throughout this documentation and in the See Also section.

Introduction

As SWAG is a NGINX proxy with curated configurations, integration of Authelia with SWAG is very easy and you only need to enabled two includes.

Note: All paths in this guide are the locations inside the container. You will have to either edit the files within the container or adapt the path to the path you have mounted the relevant container path to.

Get Started

It’s strongly recommended that users setting up Authelia for the first time take a look at our Get Started guide. This takes you through various steps which are essential to bootstrapping Authelia.

Requirements

SWAG supports the required NGINX requirements for Authelia out-of-the-box.

SWAG Caveat

One current caveat of the SWAG implementation is that it serves Authelia as a subpath for each domain. We strongly recommend instead of using the out of the box method and guide for SWAG that you follow the NGINX guide (which can be used with SWAG) and run Authelia as it’s own subdomain.

This is partly because Webauthn requires that the domain is an exact match when registering and authenticating and it is possible that due to web standards this will never change.

In addition this represents a bad user experience in some instances such as:

  • Users sometimes visit the https://app.example.com/authelia URL which doesn’t automatically redirect the user to https://app.example.com (if they visit https://app.example.com then they’ll be redirected to authenticate then redirected back to their original URL).
  • Administrators may wish to setup OpenID Connect 1.0 in which case it also doesn’t represent a good user experience.

Taking these factors into consideration we’re adapting our SWAG guide to use what we consider best for the users and most easily supported. Users who wish to use the SWAG guide are free to do so but may not receive the same support.

Trusted Proxies

Important: You should read the Forwarded Headers section and this section as part of any proxy configuration. Especially if you have never read it before.

To configure trusted proxies for SWAG see the NGINX section on Trusted Proxies. Adapting this to SWAG is beyond the scope of this documentation.

Docker Compose

The following docker compose example has various applications suitable for setting up an example environment.

It uses the nginx image from [linuxserver.io] which includes all of the required modules including the http_set_misc module.

It also includes the nginx-proxy-confs mod where they have several configuration examples in the /config/nginx/proxy-confs directory. This can be omitted if desired.

If you’re looking for a more complete solution [linuxserver.io] also have an nginx container called SWAG which includes ACME and various other useful utilities.

docker-compose.yaml
---
version: "3.8"

networks:
  net:
    driver: bridge

services:
  swag:
    container_name: swag
    image: lscr.io/linuxserver/swag
    restart: unless-stopped
    networks:
      net:
        aliases: []
    ports:
      - '80:80'
      - '443:443'
    volumes:
      - ${PWD}/data/swag:/config
    environment:
      PUID: '1000'
      PGID: '1000'
      TZ: 'Australia/Melbourne'
      URL: 'example.com'
      SUBDOMAINS: 'www,whoami,auth,nextcloud,'
      VALIDATION: 'http'
      CERTPROVIDER: 'cloudflare'
      ONLY_SUBDOMAINS: 'false'
      STAGING: 'true'
    cap_add:
      - NET_ADMIN
  authelia:
    container_name: authelia
    image: authelia/authelia
    restart: unless-stopped
    networks:
      net:
        aliases: []
    expose:
      - 9091
    volumes:
      - ${PWD}/data/authelia/config:/config
    environment:
      TZ: 'Australia/Melbourne'
  nextcloud:
    container_name: nextcloud
    image: lscr.io/linuxserver/nextcloud
    restart: unless-stopped
    networks:
      net:
        aliases: []
    expose:
      - 443
    volumes:
      - ${PWD}/data/nextcloud/config:/config
      - ${PWD}/data/nextcloud/data:/data
    environment:
      PUID: '1000'
      PGID: '1000'
      TZ: 'Australia/Melbourne'
  whoami:
    container_name: whoami
    image: docker.io/traefik/whoami
    restart: unless-stopped
    networks:
      net:
        aliases: []
    expose:
      - 80
    environment:
      TZ: 'Australia/Melbourne'
...

Prerequisite Steps

In the SWAG /config mount which is mounted to ${PWD}/data/swag in our example:

  1. Create a folder named snippets/authelia:
    • The mkdir -p ${PWD}/data/swag/snippets/authelia command should achieve this on Linux.
  2. Create the ${PWD}/data/swag/nginxsnippets/authelia/location.conf file which can be found here.
  3. Create the ${PWD}/data/swag/nginxsnippets/authelia/authrequest.conf file which can be found here.
    • Ensure you adjust the line error_page 401 =302 https://auth.example.com/?rd=$target_url; replacing https://auth.example.com/ with your external Authelia URL.

Protected Application

In the server configuration for the application you want to protect:

  1. Edit the /config/nginx/proxy-confs/ file for the application you wish to protect.
  2. Under the #include /config/nginx/authelia-server.conf; line which should be within the server block but not inside any location blocks add the following line: ``.
  3. Under the #include /config/nginx/authelia-location.conf; line which should be within the applications location block add the following line include /config/nginx/snippets/authelia/authrequest.conf;.

Example

server {
    listen 443 ssl;
    listen [::]:443 ssl;

    server_name whoami.*;

    include /config/nginx/ssl.conf;

    client_max_body_size 0;

    # Authelia: Step 1.
    #include /config/nginx/authelia-server.conf;
    include /config/nginx/snippets/authelia/location.conf;

    location / {
        # Authelia: Step 2.
        #include /config/nginx/authelia-location.conf;
        include /config/nginx/snippets/authelia/authrequest.conf;

        include /config/nginx/proxy.conf;
        resolver 127.0.0.11 valid=30s;
        set $upstream_app whoami;
        set $upstream_port 80;
        set $upstream_proto http;
        proxy_pass $upstream_proto://$upstream_app:$upstream_port;
    }
}

See Also