server/middlewares/csp.ts

   1 import * as helmet from 'helmet'
   2 import { CONFIG } from '../initializers/config'
   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:', 'blob:'],
  11     scriptSrc: ["'self' 'unsafe-inline' 'unsafe-eval'", 'blob:'],
  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     manifestSrc: ["'self'"],
  18     frameSrc: ["'self'"], // instead of deprecated child-src / self because of test-embed
  19     workerSrc: ["'self'", 'blob:'] // instead of deprecated child-src
  20   },
  21   CONFIG.CSP.REPORT_URI ? { reportUri: CONFIG.CSP.REPORT_URI } : {},
  22   CONFIG.WEBSERVER.SCHEME === 'https' ? { upgradeInsecureRequests: true } : {}
  23 )
  24
  25 const baseCSP = helmet.contentSecurityPolicy({
  26   directives: baseDirectives,
  27   browserSniff: false,
  28   reportOnly: CONFIG.CSP.REPORT_ONLY
  29 })
  30
  31 const embedCSP = helmet.contentSecurityPolicy({
  32   directives: Object.assign({}, baseDirectives, { frameAncestors: ['*'] }),
  33   browserSniff: false, // assumes a modern browser, but allows CDN in front
  34   reportOnly: CONFIG.CSP.REPORT_ONLY
  35 })
  36
  37 // ---------------------------------------------------------------------------
  38
  39 export {
  40   baseCSP,
  41   embedCSP
  42 }