Tighten CSP while allowing CDN hosts

config/initializers/content_security_policy.rb

@@ -2,20 +2,22 @@
 # For further information see the following documentation
 # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy
 
+assets_host = Rails.configuration.action_controller.asset_host || "https://#{ENV['WEB_DOMAIN'] || ENV['LOCAL_DOMAIN']}"
+
 Rails.application.config.content_security_policy do |p|
+  p.base_uri        :none
+  p.default_src     :none
   p.frame_ancestors :none
-  p.object_src  :none
+  p.script_src      :self, assets_host
-  p.script_src  :self
+  p.font_src        :self, assets_host
-  p.base_uri :none
+  p.img_src         :self, :https, :data, :blob
-#  p.default_src :self, :https
+  p.style_src       :self, :unsafe_inline, assets_host
-#  p.font_src    :self, :https, :data
+  p.media_src       :self, :data, assets_host
-#  p.img_src     :self, :https, :data
+  p.frame_src       :self, :https
-#  p.style_src   :self, :https, :unsafe_inline
+  p.connect_src     :self, assets_host, Rails.configuration.x.streaming_api_base_url
-#
-#  # Specify URI for violation reports
-#  # p.report_uri "/csp-violation-report-endpoint"
 end
 
+
 # Report CSP violations to a specified URI
 # For further information see the following documentation:
 # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only