docker-swag/root/defaults/nginx/authelia-server.conf.sample

## Version 2024/03/14 - Changelog: https://github.com/linuxserver/docker-swag/commits/master/root/defaults/nginx/authelia-server.conf.sample
# Make sure that your authelia container is in the same user defined bridge network and is named authelia
# Rename /config/nginx/proxy-confs/authelia.subdomain.conf.sample to /config/nginx/proxy-confs/authelia.subdomain.conf
# For authelia 4.37 and below, make sure that the authelia configuration.yml has 'path: "authelia"' defined
# For authelia 4.38 and above, make sure that the authelia configuration.yml has 'address: "tcp://:9091/authelia"' defined

# location for authelia subfolder requests
location ^~ /authelia {
    auth_request off; # requests to this subfolder must be accessible without authentication
    include /config/nginx/proxy.conf;
    include /config/nginx/resolver.conf;
    set $upstream_authelia authelia;
    proxy_pass http://$upstream_authelia:9091;
}

# location for authelia auth requests
location ~ /authelia/api/(authz/auth-request|verify) {
    internal;

    include /config/nginx/proxy.conf;
    include /config/nginx/resolver.conf;
    set $upstream_authelia authelia;
    proxy_pass http://$upstream_authelia:9091;

    ## Include the Set-Cookie header if present
    auth_request_set $set_cookie $upstream_http_set_cookie;
    add_header Set-Cookie $set_cookie;

    proxy_pass_request_body off;
    proxy_set_header Content-Length "";
}

# virtual location for authelia 401 redirects
location @authelia_proxy_signin {
    internal;

    ## Include the Set-Cookie header if present
    auth_request_set $set_cookie $upstream_http_set_cookie;
    add_header Set-Cookie $set_cookie;

    ## Set the $target_url variable based on the original request
    set_escape_uri $target_url $scheme://$http_host$request_uri;

    ## Translate the Location response header from the auth subrequest into a variable
    auth_request_set $signin_url $upstream_http_location;

    if ($signin_url = '') {
        ## Set the $signin_url variable
        set $signin_url https://$http_host/authelia/?rd=$target_url;
    }

    ## Redirect to login
    return 302 $signin_url;
}