SAML 2.0 Single Sign-On WordPress Plugin Fix for Nginx

nginx-site-config-file.conf

# 1) Edit the site's nginx config (/etc/nginx/custom-sites/site-name.conf) to add the lines below.
# 2) Reload nginx: sudo service nginx reload

server {
  # existing conf here
  
  # Nginx fix for the SAML 2.0 Single Sign-On plugin.
  location ^~ /wp-content/plugins/saml-20-single-sign-on {
    location ~ ^(?<script_name>.*?\.php)(?<path_info>/.*)?$ {
      include fastcgi_params;
      fastcgi_param SCRIPT_FILENAME $document_root$script_name;
      fastcgi_param PATH_INFO $path_info;
      fastcgi_param PATH_TRANSLATED $document_root$path_info;
      fastcgi_pass unix:/var/run/php5-fpm.sock;
    }
  }
}

samlauth.php

<?php
/*
Plugin Name: SAML 2.0 Single Sign-On
Version: 0.9.4
Plugin URI: http://keithbartholomew.com
Description: Authenticate users using <a href="http://rnd.feide.no/simplesamlphp">simpleSAMLphp</a>.
Author: Keith Bartholomew
Author URI: http://keithbartholomew.com
*/

// Comment out this line that shouldn't be here:
// define('WP_DEBUG', true);