simple_shibboleth.php

<?php
/*
Plugin Name: Simple Shibboleth Authentication
Author: Martin Parm
Version: 0.0.1
*/

function custom_login(){
  $headers = getallheaders();
  // TODO: Bail on no SSO-heaers
  $user = new WP_user(null, $headers['SSO-User']);
  if ($user->exists()){
    if (($user->user_email != $headers['SSO-Mail']) ||
        ($user->first_name != $headers['SSO-GivenName']) ||
        ($user->last_name  != $headers['SSO-Surname'])){
            // Update + role
            wp_update_user(array(
                'ID'         => $user->ID,
                'user_email' => $headers['SSO-Mail'],
                'first_name' => $headers['SSO-GivenName'],
                'last_name'  => $headers['SSO-Surname']
            ));
            $user = new WP_user($user->ID);
    }
  } else {
    $user_id = wp_insert_user(array(
      'user_login' => $headers['SSO-User'],
      'user_pass'  => wp_generate_password( 12, false ),
      'user_email' => $headers['SSO-Mail'],
      'first_name' => $headers['SSO-GivenName'],
      'last_name'  => $headers['SSO-Surname']
    ));
    $user = new WP_user($user_id);
  }

  $current_user_id = get_current_user_id();
  if ($user->ID != $current_user_id){
    wp_logout();
    wp_clear_auth_cookie();
    wp_set_current_user($user->ID, $headers['SSO-User']);
    wp_set_auth_cookie($user->ID);
  }
}
add_action( 'after_setup_theme', 'custom_login' );

function hide_bio_stuff() {
  ?>
    <script type="text/javascript">
      //<![CDATA[
      jQuery(document).ready( function($) {
        var form = $('#your-profile');
        form.find('input#first_name').prop('readonly', true);
        form.find('input#last_name').prop('readonly', true);
        form.find('input#email').prop('readonly', true);
        var p = form.find('tr#password');
        p.next().remove();
        p.remove();
      });
      //]]>
    </script>
    <style type="text/css" media="screen">
      #your-profile input[readonly]{
        color: rgba(51,51,51,.5);
      }
    </style>
  <?php
}
add_action( 'admin_head-profile.php' , 'hide_bio_stuff' );
?>