020759bfb3
require-trusted-types-for only accepts 'script'; emitting 'none' produced an invalid directive that browsers rejected. Omit the directive entirely to leave Trusted Types unenforced (needed for WebAuthn). Bump version to 0.16.1. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
79 lines
3.1 KiB
Ruby
79 lines
3.1 KiB
Ruby
# Be sure to restart your server when you modify this file.
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# Define an application-wide content security policy.
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# See the Securing Rails Applications Guide for more information:
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# https://guides.rubyonrails.org/security.html#content-security-policy-header
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Rails.application.configure do
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config.content_security_policy do |policy|
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# Default to self for everything, plus blob: for file downloads
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policy.default_src :self, "blob:"
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# Scripts: self + per-response nonce (see nonce config below) + blob: for
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# downloads. No unsafe-inline — importmap/Turbo/Stimulus inline tags carry the
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# nonce automatically, and the one hand-written inline script is nonced.
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policy.script_src :self, "blob:"
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# Styles: self + per-response nonce. No unsafe-inline — Tailwind ships as an
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# external stylesheet, Turbo's injected <style> carries the nonce, and Stimulus
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# sets styles via the CSSOM (not governed by CSP).
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policy.style_src :self
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# Images: Allow self, data URLs, and https for external images
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policy.img_src :self, :data, :https
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# Fonts: Allow self and data URLs
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policy.font_src :self, :data
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# Connect: Allow self for API calls, WebAuthn, and ActionCable if needed
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# WebAuthn endpoints are on the same domain, so self is sufficient
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policy.connect_src :self, "wss:"
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# Media: Allow self
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policy.media_src :self
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# Object and embed sources: Disallow for security (no Flash/etc)
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policy.object_src :none
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policy.frame_src :none
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policy.frame_ancestors :none
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# Base URI: Restricted to self
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policy.base_uri :self
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# Form actions: Allow self for all form submissions
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# Note: OAuth redirects will be handled dynamically in the consent page
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policy.form_action :self
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# Manifest sources: Allow self for PWA manifest
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policy.manifest_src :self
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# Worker sources: Allow self for potential Web Workers
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policy.worker_src :self
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# Child sources: Allow self for any future iframes
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policy.child_src :self
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# Do not enforce Trusted Types. The only valid value for
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# require-trusted-types-for is 'script'; there is no 'none' token, so
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# emitting it produces an invalid directive that browsers reject. To leave
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# Trusted Types unenforced (needed for WebAuthn), omit the directive entirely.
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# CSP reporting using report_uri (supported method)
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policy.report_uri "/api/csp-violation-report"
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end
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# Per-response random nonce applied to script-src and style-src. The app does
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# not page-cache HTML, so a fresh random nonce per response is the most secure
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# choice (no reuse across responses). csp_meta_tag (in the layout) and
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# importmap-rails read this nonce automatically.
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config.content_security_policy_nonce_generator = ->(_request) { SecureRandom.base64(16) }
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config.content_security_policy_nonce_directives = %w[script-src style-src]
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# Start with CSP in report-only mode for testing
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# Set to false after verifying everything works in production
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config.content_security_policy_report_only = Rails.env.development?
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# Report CSP violations (optional - uncomment to enable)
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# config.content_security_policy_report_uri = "/csp-violations"
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end
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