discourse/lib/content_security_policy/default.rb

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# frozen_string_literal: true
require 'content_security_policy'
class ContentSecurityPolicy
class Default
attr_reader :directives
def initialize(base_url:)
@base_url = base_url
@directives = {}.tap do |directives|
directives[:upgrade_insecure_requests] = [] if SiteSetting.force_https
directives[:base_uri] = [:self]
directives[:object_src] = [:none]
directives[:script_src] = script_src
directives[:worker_src] = worker_src
directives[:report_uri] = report_uri if SiteSetting.content_security_policy_collect_reports
directives[:frame_ancestors] = frame_ancestors if restrict_embed?
directives[:manifest_src] = ["'self'"]
end
end
private
def base_url
@base_url
end
SCRIPT_ASSET_DIRECTORIES = [
# [dir, can_use_s3_cdn, can_use_cdn, for_worker]
['/assets/', true, true, true],
['/brotli_asset/', true, true, true],
['/extra-locales/', false, false, false],
['/highlight-js/', false, true, false],
['/javascripts/', false, true, true],
['/plugins/', false, true, true],
['/theme-javascripts/', false, true, false],
['/svg-sprite/', false, true, false],
]
def script_assets(base = base_url, s3_cdn = GlobalSetting.s3_cdn_url, cdn = GlobalSetting.cdn_url, worker: false)
SCRIPT_ASSET_DIRECTORIES.map do |dir, can_use_s3_cdn, can_use_cdn, for_worker|
next if worker && !for_worker
if can_use_s3_cdn && s3_cdn
s3_cdn + dir
elsif can_use_cdn && cdn
cdn + Discourse.base_path + dir
else
base + dir
end
end.compact
end
def script_src
[
"#{base_url}/logs/",
"#{base_url}/sidekiq/",
"#{base_url}/mini-profiler-resources/",
*script_assets
].tap do |sources|
sources << :report_sample if SiteSetting.content_security_policy_collect_reports
sources << :unsafe_eval if Rails.env.development? # TODO remove this once we have proper source maps in dev
# Support Ember CLI Live reload
if Rails.env.development?
sources << "#{base_url}/ember-cli-live-reload.js"
sources << "#{base_url}/_lr/"
end
# we need analytics.js still as gtag/js is a script wrapper for it
sources << 'https://www.google-analytics.com/analytics.js' if SiteSetting.ga_universal_tracking_code.present?
sources << 'https://www.googletagmanager.com/gtag/js' if SiteSetting.ga_universal_tracking_code.present? && SiteSetting.ga_version == "v4_gtag"
if SiteSetting.gtm_container_id.present?
sources << 'https://www.googletagmanager.com/gtm.js'
sources << "'nonce-#{ApplicationHelper.google_tag_manager_nonce}'"
end
if SiteSetting.splash_screen
sources << "'#{SplashScreenHelper.fingerprint}'"
end
end
end
def worker_src
[
"'self'", # For service worker
*script_assets(worker: true)
]
end
def report_uri
"#{base_url}/csp_reports"
end
def frame_ancestors
[
"'self'",
*EmbeddableHost.pluck(:host).map { |host| "https://#{host}" }
]
end
def restrict_embed?
SiteSetting.content_security_policy_frame_ancestors &&
!SiteSetting.embed_any_origin
end
end
end