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-#+title: Creating a Referrer Ban List on Nginx
-#+date:  2022-11-29
-
-** Creating the Ban List
-:PROPERTIES:
-:CUSTOM_ID: creating-the-ban-list
-:END:
-In order to ban list referral domains or websites with Nginx, you need
-to create a ban list file. The file below will accept regexes for
-different domains or websites you wish to block.
-
-First, create the file in your nginx directory:
-
-#+begin_src sh
-doas nano /etc/nginx/banlist.conf
-#+end_src
-
-Next, paste the following contents in and fill out the regexes with
-whichever domains you're blocking.
-
-#+begin_src conf
-# /etc/nginx/banlist.conf
-
-map $http_referer $bad_referer {
-    hostnames;
-
-    default                           0;
-
-    # Put regexes for undesired referrers here
-    "~news.ycombinator.com"           1;
-}
-#+end_src
-
-** Configuring Nginx
-:PROPERTIES:
-:CUSTOM_ID: configuring-nginx
-:END:
-In order for the ban list to work, Nginx needs to know it exists and how
-to handle it. For this, edit the =nginx.conf= file.
-
-#+begin_src sh
-doas nano /etc/nginx/nginx.conf
-#+end_src
-
-Within this file, find the =http= block and add your ban list file
-location to the end of the block.
-
-#+begin_src conf
-# /etc/nginx/nginx.conf
-
-http {
-  ...
-
-  # Include ban list
-  include /etc/nginx/banlist.conf;
-}
-#+end_src
-
-** Enabling the Ban List
-:PROPERTIES:
-:CUSTOM_ID: enabling-the-ban-list
-:END:
-Finally, we need to take action when a bad referral site is found. To do
-so, edit the configuration file for your website. For example, I have
-all website configuration files in the =http.d= directory. You may have
-them in the =sites-available= directory on some distributions.
-
-#+begin_src sh
-doas nano /etc/nginx/http.d/example.com.conf
-#+end_src
-
-Within each website's configuration file, edit the =server= blocks that
-are listening to ports 80 and 443 and create a check for the
-=$bad_referrer= variable we created in the ban list file.
-
-If a matching site is found, you can return any
-[[https://en.wikipedia.org/wiki/List_of_HTTP_status_codes][HTTP Status
-Code]] you want. Code 403 (Forbidden) is logical in this case since you
-are preventing a client connection due to a banned domain.
-
-#+begin_src conf
-server {
-  ...
-
-  # If a referral site is banned, return an error
-  if ($bad_referer) {
-    return 403;
-  }
-  
-  ...
-}
-#+end_src
-
-** Restart Nginx
-:PROPERTIES:
-:CUSTOM_ID: restart-nginx
-:END:
-Lastly, restart Nginx to enable all changes made.
-
-#+begin_src sh
-doas rc-service nginx restart
-#+end_src
-
-** Testing Results
-:PROPERTIES:
-:CUSTOM_ID: testing-results
-:END:
-In order to test the results, let's curl the contents of our site. To
-start, I'll curl the site normally:
-
-#+begin_src sh
-curl https://cleberg.net
-#+end_src
-
-The HTML contents of the page come back successfully:
-
-#+begin_src html
-<!doctype html>...</html>
-#+end_src
-
-Next, let's include a banned referrer:
-
-#+begin_src sh
-curl --referer https://news.ycombinator.com https://cleberg.net
-#+end_src
-
-This time, I'm met with a 403 Forbidden response page. That means we are
-successful and any clients being referred from a banned domain will be
-met with this same response code.
-
-#+begin_src html
-<html>
-<head><title>403 Forbidden</title></head>
-<body>
-<center><h1>403 Forbidden</h1></center>
-<hr><center>nginx</center>
-</body>
-</html>
-#+end_src