Merge branch 'pull/4985'

[rails.git] / config / initializers / content_security_policy.rb

diff --git a/config/initializers/content_security_policy.rb b/config/initializers/content_security_policy.rb
index d3bcaa5ec84ac0761911dcdc0a7bf1c67f44a392..9ddaf70f94598b62f6d65a272457d61c68c05ed6 100644 (file)
--- a/config/initializers/content_security_policy.rb
+++ b/config/initializers/content_security_policy.rb
@@ -1,25 +1,45 @@
 # Be sure to restart your server when you modify this file.
 
-# Define an application-wide content security policy
-# For further information see the following documentation
-# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy
+# Define an application-wide content security policy.
+# See the Securing Rails Applications Guide for more information:
+# https://guides.rubyonrails.org/security.html#content-security-policy-header
 
-# Rails.application.config.content_security_policy do |policy|
-#   policy.default_src :self, :https
-#   policy.font_src    :self, :https, :data
-#   policy.img_src     :self, :https, :data
-#   policy.object_src  :none
-#   policy.script_src  :self, :https
-#   policy.style_src   :self, :https
+Rails.application.configure do
+  connect_src = [:self]
+  img_src = [:self, :data, "www.gravatar.com", "*.wp.com", "tile.openstreetmap.org", "gps.tile.openstreetmap.org", "*.tile.thunderforest.com", "tile.tracestrack.com", "*.openstreetmap.fr"]
+  script_src = [:self]
 
-#   # Specify URI for violation reports
-#   # policy.report_uri "/csp-violation-report-endpoint"
-# end
+  connect_src << Settings.matomo["location"] if defined?(Settings.matomo)
+  img_src << Settings.matomo["location"] if defined?(Settings.matomo)
+  script_src << Settings.matomo["location"] if defined?(Settings.matomo)
 
-# If you are using UJS then enable automatic nonce generation
-# Rails.application.config.content_security_policy_nonce_generator = -> request { SecureRandom.base64(16) }
+  img_src << Settings.avatar_storage_url if Settings.key?(:avatar_storage_url)
+  img_src << Settings.trace_image_storage_url if Settings.key?(:trace_image_storage_url)
 
-# 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
-# Rails.application.config.content_security_policy_report_only = true
+  config.content_security_policy do |policy|
+    policy.default_src :self
+    policy.child_src(:self)
+    policy.connect_src(*connect_src)
+    policy.font_src(:none)
+    policy.form_action(:self)
+    policy.frame_ancestors(:self)
+    policy.frame_src(:self)
+    policy.img_src(*img_src)
+    policy.manifest_src(:self)
+    policy.media_src(:none)
+    policy.object_src(:self)
+    policy.plugin_types
+    policy.script_src(*script_src)
+    policy.style_src(:self)
+    policy.worker_src(:none)
+    policy.manifest_src(:self)
+    policy.report_uri(Settings.csp_report_url) if Settings.key?(:csp_report_url)
+  end
+
+  # Generate session nonces for permitted importmap and inline scripts
+  config.content_security_policy_nonce_generator = ->(_request) { SecureRandom.base64(24) }
+  config.content_security_policy_nonce_directives = %w[style-src]
+
+  # Report violations without enforcing the policy.
+  config.content_security_policy_report_only = true unless Settings.csp_enforce
+end