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Add a Report-Only Content-Security-Policy baseline

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Campfire ships no CSP today (the initializer is the stock, fully-commented
file). This adds a conservative Report-Only policy — default-src 'self';
object-src 'none'; base-uri/frame-ancestors/form-action 'self' — so browsers
evaluate and report violations without enforcing anything. Rendering and
behavior are unaffected. Next steps: wire a report endpoint, tune against
observed violations, then flip content_security_policy_report_only off to
enforce.
This commit is contained in:
Jeremy Daer
2026-08-08 14:27:51 -07:00
parent 2aa4141077
commit f09110c14d
1 changed files with 20 additions and 20 deletions
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config/initializers/content_security_policy.rb
+20 -20
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@@ -1,25 +1,25 @@
# Be sure to restart your server when you modify this file.
# Define an application-wide content security policy.
# Baseline application-wide Content-Security-Policy, deployed in Report-Only
# mode: browsers evaluate the policy and report violations (once a report
# endpoint is wired up) but enforce nothing, so rendering cannot break.
# Tune the policy against observed violations, then flip
# `content_security_policy_report_only` off to enforce it.
#
# See the Securing Rails Applications Guide for more information:
# https://guides.rubyonrails.org/security.html#content-security-policy-header
# Rails.application.configure do
# 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
# # Specify URI for violation reports
# # policy.report_uri "/csp-violation-report-endpoint"
# end
#
# # Generate session nonces for permitted importmap and inline scripts
# config.content_security_policy_nonce_generator = ->(request) { request.session.id.to_s }
# config.content_security_policy_nonce_directives = %w(script-src)
#
# # Report violations without enforcing the policy.
# # config.content_security_policy_report_only = true
# end
Rails.application.configure do
config.content_security_policy do |policy|
policy.default_src :self
policy.object_src :none
policy.base_uri :self
policy.frame_ancestors :self
policy.form_action :self
# Specify URI for violation reports once a report sink is available
# policy.report_uri "/csp-violation-report-endpoint"
end
# Report violations without enforcing the policy.
config.content_security_policy_report_only = true
end