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: [] } : {}
  23 )
  24
  25 const baseCSP = helmet.contentSecurityPolicy({
  26   directives: baseDirectives,
  27   reportOnly: CONFIG.CSP.REPORT_ONLY
  28 })
  29
  30 const embedCSP = helmet.contentSecurityPolicy({
  31   directives: Object.assign({}, baseDirectives, { frameAncestors: [ '*' ] }),
  32   reportOnly: CONFIG.CSP.REPORT_ONLY
  33 })
  34
  35 // ---------------------------------------------------------------------------
  36
  37 export {
  38   baseCSP,
  39   embedCSP
  40 }