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Nginx

nginx is a reverse proxy supported by Authelia.

Configuration

Below you will find commented examples of the following configuration:

Authelia portal
Protected endpoint (Nextcloud)
Supplementary config

With the below configuration you can add authelia.conf to virtual hosts to support protection with Authelia. auth.conf is utilised to enable the protection either at the root location or a more specific location/route. proxy.conf is included just for completeness.

Supplementary config

authelia.conf

# Virtual endpoint created by nginx to forward auth requests.
location /authelia {
    internal;
    set $upstream_authelia http://authelia:9091/api/verify;
    proxy_pass_request_body off;
    proxy_pass $upstream_authelia;    
    proxy_set_header Content-Length "";

    # Timeout if the real server is dead
    proxy_next_upstream error timeout invalid_header http_500 http_502 http_503;

    # [REQUIRED] Needed by Authelia to check authorizations of the resource.
    # Provide either X-Original-URL and X-Forwarded-Proto or
    # X-Forwarded-Proto, X-Forwarded-Host and X-Forwarded-Uri or both.
    # Those headers will be used by Authelia to deduce the target url of the user.
    # Basic Proxy Config
    client_body_buffer_size 128k;
    proxy_set_header Host $host;
    proxy_set_header X-Original-URL $scheme://$http_host$request_uri;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $remote_addr; 
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header X-Forwarded-Host $http_host;
    proxy_set_header X-Forwarded-Uri $request_uri;
    proxy_set_header X-Forwarded-Ssl on;
    proxy_redirect  http://  $scheme://;
    proxy_http_version 1.1;
    proxy_set_header Connection "";
    proxy_cache_bypass $cookie_session;
    proxy_no_cache $cookie_session;
    proxy_buffers 4 32k;

    # Advanced Proxy Config
    send_timeout 5m;
    proxy_read_timeout 240;
    proxy_send_timeout 240;
    proxy_connect_timeout 240;
}

auth.conf

# Basic Authelia Config
# Send a subsequent request to Authelia to verify if the user is authenticated
# and has the right permissions to access the resource.
auth_request /authelia;
# Set the `target_url` variable based on the request. It will be used to build the portal
# URL with the correct redirection parameter.
auth_request_set $target_url $scheme://$http_host$request_uri;
# Set the X-Forwarded-User and X-Forwarded-Groups with the headers
# returned by Authelia for the backends which can consume them.
# This is not safe, as the backend must make sure that they come from the
# proxy. In the future, it's gonna be safe to just use OAuth.
auth_request_set $user $upstream_http_remote_user;
auth_request_set $groups $upstream_http_remote_groups;
proxy_set_header X-Forwarded-User $user;
proxy_set_header X-Forwarded-Groups $groups;
# If Authelia returns 401, then nginx redirects the user to the login portal.
# If it returns 200, then the request pass through to the backend.
# For other type of errors, nginx will handle them as usual.
error_page 401 =302 https://auth.example.com/?rd=$target_url;

proxy.conf

client_body_buffer_size 128k;

#Timeout if the real server is dead
proxy_next_upstream error timeout invalid_header http_500 http_502 http_503;

# Advanced Proxy Config
send_timeout 5m;
proxy_read_timeout 360;
proxy_send_timeout 360;
proxy_connect_timeout 360;

# Basic Proxy Config
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Forwarded-Host $http_host;
proxy_set_header X-Forwarded-Uri $request_uri;
proxy_set_header X-Forwarded-Ssl on;
proxy_redirect  http://  $scheme://;
proxy_http_version 1.1;
proxy_set_header Connection "";
proxy_cache_bypass $cookie_session;
proxy_no_cache $cookie_session;
proxy_buffers 64 256k;

# If behind reverse proxy, forwards the correct IP
set_real_ip_from 10.0.0.0/8;
set_real_ip_from 172.0.0.0/8;
set_real_ip_from 192.168.0.0/16;
set_real_ip_from fc00::/7;
real_ip_header X-Forwarded-For;
real_ip_recursive on;

Authelia Portal

server {
    server_name auth.example.com;
    listen 80;
    return 301 https://$server_name$request_uri;
}

server {
    server_name auth.example.com;
    listen 443 ssl http2;
    include /config/nginx/ssl.conf;

    location / {
        set $upstream_authelia http://authelia:9091; # This example assumes a Docker deployment 
        proxy_pass $upstream_authelia;
        include /config/nginx/proxy.conf; # 
    }
}

Protected Endpoint

server {
    server_name nextcloud.example.com;
    listen 80;
    return 301 https://$server_name$request_uri;
}

server {
    server_name nextcloud.example.com;
    listen 443 ssl http2;
    include /config/nginx/ssl.conf;
    include /config/nginx/authelia.conf; # Virtual endpoint to forward auth requests

    location / {
        set $upstream_nextcloud https://nextcloud;
        proxy_pass $upstream_nextcloud;
        include /config/nginx/auth.conf; # Activates Authelia for specified route/location, please ensure you have setup the domain in your configuration.yml
        include /config/nginx/proxy.conf; # Reverse proxy configuration
    }
}

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