1 files changed, 44 insertions, 0 deletions

diff --git a/server/middlewares/csp.ts b/server/middlewares/csp.ts
new file mode 100644
index 000000000..5fa9d1ab5
--- /dev/null
+++ b/server/middlewares/csp.ts
@@ -0,0 +1,44 @@
+import * as helmet from 'helmet'
+import { CONFIG } from '../initializers/constants'
+
+const baseDirectives = Object.assign({},
+  {
+    defaultSrc: ["'none'"], // by default, not specifying default-src = '*'
+    connectSrc: ['*', 'data:'],
+    mediaSrc: ["'self'", 'https:', 'blob:'],
+    fontSrc: ["'self'", 'data:'],
+    imgSrc: ["'self'", 'data:'],
+    scriptSrc: ["'self' 'unsafe-inline' 'unsafe-eval'"],
+    styleSrc: ["'self' 'unsafe-inline'"],
+    objectSrc: ["'none'"], // only define to allow plugins, else let defaultSrc 'none' block it
+    formAction: ["'self'"],
+    frameAncestors: ["'none'"],
+    baseUri: ["'self'"],
+    manifestSrc: ["'self'"],
+    frameSrc: ["'self'"], // instead of deprecated child-src / self because of test-embed
+    workerSrc: ["'self'", 'blob:'] // instead of deprecated child-src
+  },
+  CONFIG.SERVICES['CSP-LOGGER'] ? { reportUri: CONFIG.SERVICES['CSP-LOGGER'] } : {},
+  CONFIG.WEBSERVER.SCHEME === 'https' ? { upgradeInsecureRequests: true } : {}
+)
+
+const baseCSP = helmet.contentSecurityPolicy({
+  directives: baseDirectives,
+  browserSniff: false,
+  reportOnly: true
+})
+
+const embedCSP = helmet.contentSecurityPolicy({
+  directives: Object.assign(baseDirectives, {
+    frameAncestors: ['*']
+  }),
+  browserSniff: false, // assumes a modern browser, but allows CDN in front
+  reportOnly: true
+})
+
+// ---------------------------------------------------------------------------
+
+export {
+  baseCSP,
+  embedCSP
+}