Content Security Policy

.env.example

@@ -1,7 +1,8 @@
-RAILS_ENV=production
+RAILS_ENV=
 IMAP_SERVER=
 DEFAULT_FROM=
 SKEL_SUTTY=https://0xacab.org/sutty/skel.sutty.nl
-SUTTY=sutty.nl
+SUTTY=sutty.local
+SUTTY_WITH_PORT=sutty.local:3000
 REDIS_SERVER=
 REDIS_CLIENT=

app/controllers/api/v1/base_controller.rb

@@ -4,9 +4,6 @@ module Api
   module V1
     # API
     class BaseController < ActionController::Base
-      http_basic_authenticate_with name: ENV['HTTP_BASIC_USER'],
-                                   password: ENV['HTTP_BASIC_PASSWORD']
-
       protect_from_forgery with: :null_session
       respond_to :json
     end

app/controllers/api/v1/csp_reports_controller.rb

@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+module Api
+  module V1
+    # Recibe los reportes de Content Security Policy
+    class CspReportsController < BaseController
+      # Crea un reporte de CSP intercambiando los guiones medios por
+      # bajos
+      #
+      # TODO: Aplicar rate_limit
+      def create
+        csp = CspReport.new(csp_report_params.to_h.map do |k, v|
+                              { k.tr('-', '_') => v }
+                            end.inject(&:merge))
+
+        csp.id = SecureRandom.uuid
+        csp.save
+
+        render json: {}, status: :created
+      end
+
+      private
+
+      # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only#Violation_report_syntax
+      def csp_report_params
+        params.require(:'csp-report')
+              .permit(:disposition,
+                      :referrer,
+                      :'blocked-uri',
+                      :'document-uri',
+                      :'effective-directive',
+                      :'original-policy',
+                      :'script-sample',
+                      :'status-code',
+                      :'violated-directive',
+                      :'line-number',
+                      :'column-number',
+                      :'source-file')
+      end
+    end
+  end
+end

app/controllers/api/v1/sites_controller.rb

@@ -4,6 +4,9 @@ module Api
   module V1
     # API para sitios
     class SitesController < BaseController
+      http_basic_authenticate_with name: ENV['HTTP_BASIC_USER'],
+                                   password: ENV['HTTP_BASIC_PASSWORD']
+
       def index
         render json: Site.all.order(:name).pluck(:name)
       end

app/models/csp_report.rb

@@ -0,0 +1,4 @@
+# frozen_string_literal: true
+
+# Almacena un reporte de CSP
+class CspReport < ApplicationRecord; end

config/initializers/content_security_policy.rb

@@ -6,31 +6,34 @@
 # For further information see the following documentation
 # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy
 
-# 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
-#   # If you are using webpack-dev-server then specify
-#   # webpack-dev-server host
-#   policy.connect_src :self, :https, "http://localhost:3035",
-#   "ws://localhost:3035" if Rails.env.development?
+Rails.application.config.content_security_policy do |policy|
+  policy.default_src :self
+  # XXX: Varios scripts generan estilos en línea
+  policy.style_src   :self, :unsafe_inline
+  # Repetimos la default para poder saber cuál es la política en falta
+  policy.script_src  :self
+  policy.font_src    :self
+  # TODO: Permitimos cargar imágenes remotas?
+  policy.img_src     :self
+  # Ya no usamos applets!
+  policy.object_src  :none
+  if Rails.env.development?
+    policy.connect_src :self,
+                       'http://localhost:3035',
+                       'ws://localhost:3035'
+  end
 
-#   # Specify URI for violation reports
-#   # policy.report_uri "/csp-violation-report-endpoint"
-# end
+  # Specify URI for violation reports
+  policy.report_uri "https://api.#{ENV.fetch('SUTTY_WITH_PORT', 'sutty.nl')}/v1/csp_reports.json"
+end
 
 # If you are using UJS then enable automatic nonce generation
-# Rails.application.config.content_security_policy_nonce_generator =
-# -> request { SecureRandom.base64(16) }
+# Rails.application.config.content_security_policy_nonce_generator = -> request { SecureRandom.base64(16) }
 
 # Set the nonce only to specific directives
-# Rails.application.config.content_security_policy_nonce_directives =
-# %w(script-src)
+# Rails.application.config.content_security_policy_nonce_directives = %w(script-src)
 
 # 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
+Rails.application.config.content_security_policy_report_only = false

config/initializers/mime_types.rb

@@ -1,6 +1,3 @@
 # frozen_string_literal: true
 
-# Be sure to restart your server when you modify this file.
-
-# Add new mime types for use in respond_to blocks:
-# Mime::Type.register "text/richtext", :rtf
+Mime::Type.register 'application/csp-report', :json

config/routes.rb

@@ -18,6 +18,7 @@ Rails.application.routes.draw do
   constraints subdomain: 'api' do
     scope module: 'api' do
       namespace :v1 do
+        resources :csp_reports, only: %i[create]
         get 'sites/allowed', to: 'sites#allowed'
         resources :sites, only: %i[index]
       end

db/migrate/20200205173039_create_csp_reports.rb

@@ -0,0 +1,17 @@
+class CreateCspReports < ActiveRecord::Migration[6.0]
+  def change
+    create_table :csp_reports, id: :uuid do |t|
+      t.timestamps
+
+      t.string :disposition
+      t.string :referrer
+      t.string :blocked_uri
+      t.string :document_uri
+      t.string :effective_directive
+      t.string :original_policy
+      t.string :script_sample
+      t.string :status_code
+      t.string :violated_directive
+    end
+  end
+end

db/migrate/20200206151057_add_source_to_csp_reports.rb

@@ -0,0 +1,7 @@
+class AddSourceToCspReports < ActiveRecord::Migration[6.0]
+  def change
+    add_column :csp_reports, :column_number, :integer
+    add_column :csp_reports, :line_number, :integer
+    add_column :csp_reports, :source_file, :string
+  end
+end

db/schema.rb

@@ -12,7 +12,10 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20_190_829_180_743) do
+ActiveRecord::Schema.define(version: 20_200_206_151_057) do
+  # Could not dump table "access_logs" because of following StandardError
+  #   Unknown type '' for column 'id'
+
   create_table 'action_text_rich_texts', force: :cascade do |t|
     t.string 'name', null: false
     t.text 'body'
@@ -55,6 +58,9 @@ ActiveRecord::Schema.define(version: 20_190_829_180_743) do
     t.index ['deploy_id'], name: 'index_build_stats_on_deploy_id'
   end
 
+  # Could not dump table "csp_reports" because of following StandardError
+  #   Unknown type 'uuid' for column 'id'
+
   create_table 'deploys', force: :cascade do |t|
     t.datetime 'created_at', null: false
     t.datetime 'updated_at', null: false
@@ -132,6 +138,7 @@ ActiveRecord::Schema.define(version: 20_190_829_180_743) do
     t.string 'status', default: 'waiting'
     t.text 'description'
     t.string 'title'
+    t.boolean 'colaboracion_anonima', default: false
     t.index ['design_id'], name: 'index_sites_on_design_id'
     t.index ['licencia_id'], name: 'index_sites_on_licencia_id'
     t.index ['name'], name: 'index_sites_on_name', unique: true

test/controllers/api/v1/csp_reports_controller_test.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+
+module Api
+  module V1
+    class CSPReportsControllerTest < ActionDispatch::IntegrationTest
+      test 'se puede enviar un reporte' do
+        post v1_csp_reports_url,
+             params: {
+               'csp-report': {
+                 'document-uri': 'http://example.com/signup.html',
+                 'referrer': '',
+                 'blocked-uri': 'http://example.com/css/style.css',
+                 'violated-directive': 'style-src cdn.example.com',
+                 'original-policy': "default-src 'none'; style-src cdn.example.com; report-uri /_/csp-reports"
+               }
+             }
+
+        assert_equal 201, response.status
+        assert_equal 1, CspReport.all.count
+      end
+    end
+  end
+end