blogs: add CSP report header to blog sites

Ref gh-54
Closes gh-72

hieradata/environments/production/roles/blogs.yaml

@@ -5,6 +5,7 @@ profile::certbot::certificates:
 
 profile::wordpress::blogs::admin_email: [email protected]
 profile::wordpress::blogs::wordpress_version: ~
+profile::wordpress::blogs::csp_header: "default-src 'self'; script-src 'self' code.jquery.com; report-uri https://csp-report-api.openjs-foundation.workers.dev/; report-to csp-endpoint"
 profile::wordpress::blogs::sites:
   jquery:
     host: blog.jquery.com

modules/profile/manifests/wordpress/base.pp

@@ -3,6 +3,7 @@
   String[1]           $innodb_buffer_pool_size = lookup('profile::wordpress::base::mariadb_innodb_buffer_pool_size', {default_value => '512M'}),
   String[1]           $wordpress_cli_version   = lookup('profile::wordpress::base::wordpress_cli_version'),
   Optional[String[1]] $default_site_cert       = lookup('profile::wordpress::base::default_site_cert', {default_value => undef}),
+  Optional[String[1]] $csp_header              = undef,
 ) {
   file { '/srv/mariadb':
     ensure => directory,

modules/profile/manifests/wordpress/blogs.pp

@@ -5,8 +5,11 @@
   String[1]                        $db_password_seed  = lookup('profile::wordpress::blogs::db_password_seed'),
   Stdlib::Email                    $admin_email       = lookup('profile::wordpress::blogs::admin_email'),
   String[1]                        $admin_password    = lookup('profile::wordpress::blogs::admin_password'),
+  String[1]                        $csp_header        = lookup('profile::wordpress::blogs::csp_header'),
 ) {
-  include profile::wordpress::base
+  class { 'profile::wordpress::base':
+    csp_header => $csp_header,
+  }
 
   git::clone { 'blog.jquery.com-theme':
     path   => '/srv/wordpress/blog.jquery.com-theme',

modules/profile/templates/wordpress/base/default-tls.nginx.erb

@@ -14,6 +14,12 @@ server {
 
   server_tokens off;
 
+<%- if @csp_header -%>
+  # Add Content Security Policy headers
+  add_header Reporting-Endpoints "csp-endpoint='https://csp-report-api.openjs-foundation.workers.dev/'";
+  add_header Content-Security-Policy-Report-Only "<%= @csp_header %>" always;
+<%- end -%>
+
   location /.well-known/acme-challenge {
     root /var/www/letsencrypt/;
   }