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+# Authelia
+
+[Authelia](https://github.com/authelia/authelia) is an open-source authentication and authorization server providing 2-factor authentication and single sign-on (SSO) for your applications via a web portal. It acts as a companion of reverse proxies like Nginx, Traefik, or HAProxy to let them know whether queries should pass through. Unauthenticated users are redirected to Authelia Sign-in portal instead.
+
+Authelia can be installed manually or can be installed using [Docker](https://hub.docker.com/r/authelia/authelia).
+
+Features include
+
+* Multiple two-factor methods such as 
+  * [Physical Security Key](https://www.authelia.com/docs/features/2fa/security-key) (Yubikey)
+  * OTP using Google Authenticator
+  * Mobile Notifications
+* Lockout users after too many failed login attempts
+* Highly Customizable Access Control using rules to match criteria such as subdomain, username, groups the user is in, and Network
+* Authelia [Community](https://discord.authelia.com/) Support
+* Full list of features can be viewed [Here](https://www.authelia.com/docs/features/)
+
+
+![Authelia Screenshot](../images/authelia.png)
+
+--8<-- "recipe-tfa-ingredients.md"
+
+
+
+## Preparation
+
+### Setup data locations
+
+First, we create a directory to hold the data which authelia will serve:
+
+```
+mkdir /var/data/config/authelia
+cd /var/data/config/authelia
+```
+
+### Create config file
+
+Authelia configurations are defined in configuration.yml.
+
+```yml
+###############################################################
+#                   Authelia configuration                    #
+###############################################################
+
+host: 0.0.0.0
+port: 9091
+log_level: warn
+
+# This secret can also be set using the env variables AUTHELIA_JWT_SECRET_FILE
+# I used this site to generate the secret: https://www.grc.com/passwords.htm
+jwt_secret: SECRET_GOES_HERE
+
+# https://docs.authelia.com/configuration/miscellaneous.html#default-redirection-url
+default_redirection_url: https://authelia.example.com
+
+totp:
+  issuer: authelia.com
+  period: 30
+  skew: 1
+
+authentication_backend:
+  file:
+    path: /config/users_database.yml
+    # customize passwords based on https://docs.authelia.com/configuration/authentication/file.html
+    password:
+      algorithm: argon2id
+      iterations: 1
+      salt_length: 16
+      parallelism: 8
+      memory: 1024 # blocks this much of the RAM. Tune this.
+
+# https://docs.authelia.com/configuration/access-control.html
+access_control:
+  default_policy: one_factor
+  rules:
+    - domain: "*.example.com"
+      policy: one_factor
+
+    - domain: "bitwarden.example.com"
+      policy: two_factor
+
+session:
+  name: authelia_session
+  # This secret can also be set using the env variables AUTHELIA_SESSION_SECRET_FILE
+  # Used a different secret, but the same site as jwt_secret above.
+  secret: SECRET_GOES_HERE
+  expiration: 3600 # 1 hour
+  inactivity: 300 # 5 minutes
+  domain: example.com # Should match whatever your root protected domain is
+
+regulation:
+  max_retries: 3
+  find_time: 120
+  ban_time: 300
+
+storage:
+  local:
+    path: /config/db.sqlite3
+
+
+notifier:
+  smtp:
+    username: SMTP_USERNAME
+    # This secret can also be set using the env variables AUTHELIA_NOTIFIER_SMTP_PASSWORD_FILE
+    # password: # use docker secret file instead AUTHELIA_NOTIFIER_SMTP_PASSWORD_FILE
+    host: SMTP_HOST
+    port: 587 #465
+    sender: SENDER_EMAIL
+
+# For testing purpose, notifications can be sent in a file. Be sure map the volume in docker-compose.
+#  filesystem:
+#    filename: /tmp/authelia/notification.txt
+
+```
+
+
+### Create User Accounts
+Create users_database.yml this will be where we can create user accounts and give them groups
+
+```yaml
+users:
+  username:
+    displayname: "Funky Penguin"
+    password: "HASHED_PASSWORD"
+    email: myemail@example.com
+    groups:
+      - admins
+      - dev
+```
+
+To create a hashed password you can run the following command
+`docker run authelia/authelia:latest authelia hash-password YOUR_PASSWORD`
+
+
+
+### Setup Docker Swarm
+
+Create a docker swarm config file in docker-compose syntax (v3), something like this:
+
+--8<-- "premix-cta.md"
+
+
+```yaml
+version: "3.4"
+
+services:
+  authelia:
+    image: authelia/authelia:4.21.0
+    volumes:
+      - /var/data/config/authelia:/config
+    networks:
+      - traefik_public
+    deploy:
+      labels:
+        - "traefik.enable=true"
+        - "traefik.http.routers.authelia.entrypoints=https"
+        - "traefik.http.routers.authelia.rule=Host(`authelia.example.com`)"
+        - "traefik.http.middlewares.authelia.forwardauth.address=http://authelia:9091/api/verify?rd=https://authelia.example.com"
+        - "traefik.http.middlewares.authelia.forwardauth.trustForwardHeader=true"
+        - "traefik.http.middlewares.authelia.forwardauth.authResponseHeaders=Remote-User, Remote-Groups"
+        - "traefik.http.services.authelia.loadbalancer.server.port=9091"
+
+
+networks:
+  traefik_public:
+    external: true
+```
+
+
+### Traefik Configuration
+
+Now that we have created authelia we will need to configure traefik so we can run authelia in front of our services. We will first need to create a traefik middleware in `/var/data/config/traefik/middlewares.yml`
+
+
+```yaml
+http:
+  middlewares:
+    forward-auth:
+      forwardAuth:
+        address: "http://authelia:9091/api/verify?rd=https://authelia.bencey.co.nz"
+        trustForwardHeader: true
+        authResponseHeaders:
+          - "Remote-User"
+          - "Remote-Groups"
+```
+
+We will then need to add the following to `traefik.toml`
+
+```yaml
+[providers.file]
+  filename = "/etc/traefik/dynamic.yml"
+```
+
+Now if we wish to put authelia behind a service all we will need to do is add the following to the labels
+
+`- "traefik.http.routers.service.middlewares=forward-auth@file"`
+
+
+
+
+## Serving
+
+### Launch the Authelia!
+
+Launch the Authelia stack by running ```docker stack deploy authelia -c <path -to-docker-compose.yml>```
+
+
+--8<-- "recipe-footer.md"
diff --git a/manuscript/images/authelia.png b/manuscript/images/authelia.png
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diff --git a/mkdocs.yml b/mkdocs.yml
index 7943ecf..0b1efe8 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -49,6 +49,7 @@ nav:
             - Dex (static): ha-docker-swarm/traefik-forward-auth/dex-static.md    
             - Google: ha-docker-swarm/traefik-forward-auth/google.md      
             - KeyCloak: ha-docker-swarm/traefik-forward-auth/keycloak.md
+        - Authelia: ha-docker-swarm/authelia.md
         - Registry: ha-docker-swarm/registry.md
         - Mail Server: recipes/mail.md
         - Duplicity: recipes/duplicity.md