server/middlewares/csp.ts

   1 import * as helmet from 'helmet'
   2 import { CONFIG } from '../initializers/constants'
   3
   4 const baseDirectives = Object.assign({},
   5   {
   6     defaultSrc: ["'none'"], // by default, not specifying default-src = '*'
   7     connectSrc: ['*', 'data:'],
   8     mediaSrc: ["'self'", 'https:', 'blob:'],
   9     fontSrc: ["'self'", 'data:'],
  10     imgSrc: ["'self'", 'data:'],
  11     scriptSrc: ["'self' 'unsafe-inline'"],
  12     styleSrc: ["'self' 'unsafe-inline'"],
  13     // objectSrc: ["'none'"], // only define to allow plugins, else let defaultSrc 'none' block it
  14     formAction: ["'self'"],
  15     frameAncestors: ["'none'"],
  16     baseUri: ["'self'"],
  17     pluginTypes: ["'none'"],
  18     manifestSrc: ["'self'"],
  19     frameSrc: ["'self'"], // instead of deprecated child-src / self because of test-embed
  20     workerSrc: ["'self'"], // instead of deprecated child-src
  21     upgradeInsecureRequests: true
  22   },
  23   (CONFIG.SERVICES['CSP-LOGGER'] != null) ? { reportUri: CONFIG.SERVICES['CSP-LOGGER'] } : {}
  24 )
  25
  26 const baseCSP = helmet.contentSecurityPolicy({
  27   directives: baseDirectives,
  28   browserSniff: false,
  29   reportOnly: true
  30 })
  31
  32 const embedCSP = helmet.contentSecurityPolicy({
  33   directives: Object.assign(baseDirectives, {
  34     frameAncestors: ['*']
  35   }),
  36   browserSniff: false, // assumes a modern browser, but allows CDN in front
  37   reportOnly: true
  38 })
  39
  40 // ---------------------------------------------------------------------------
  41
  42 export {
  43   baseCSP,
  44   embedCSP
  45 }