Preview: GCM-Tag-Laenge fest, Inhalt validiert

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

server/services/previewEnv.js

@@ -15,7 +15,7 @@ export function envKey() {
 
 export function encryptEnv(obj, key) {
   const iv = crypto.randomBytes(12)
-  const cipher = crypto.createCipheriv('aes-256-gcm', key, iv)
+  const cipher = crypto.createCipheriv('aes-256-gcm', key, iv, { authTagLength: 16 })
   const ct = Buffer.concat([cipher.update(JSON.stringify(obj || {}), 'utf8'), cipher.final()])
   const tag = cipher.getAuthTag()
   return ['v1', iv, tag, ct].map((p) => (typeof p === 'string' ? p : p.toString('base64'))).join(':')
@@ -26,10 +26,16 @@ export function decryptEnv(str, key) {
   const parts = String(str).split(':')
   if (parts.length !== 4 || parts[0] !== 'v1') throw new Error('Ungueltiges Variablenformat')
   const [, iv, tag, ct] = parts.map((p, i) => (i === 0 ? p : Buffer.from(p, 'base64')))
-  const decipher = crypto.createDecipheriv('aes-256-gcm', key, iv)
+  if (iv.length !== 12 || tag.length !== 16) throw new Error('Ungueltiges Variablenformat')
+  const decipher = crypto.createDecipheriv('aes-256-gcm', key, iv, { authTagLength: 16 })
   decipher.setAuthTag(tag)
   const plain = Buffer.concat([decipher.update(ct), decipher.final()]).toString('utf8')
-  return JSON.parse(plain)
+  const obj = JSON.parse(plain)
+  if (!obj || typeof obj !== 'object' || Array.isArray(obj)
+    || !Object.values(obj).every((v) => typeof v === 'string')) {
+    throw new Error('Ungueltiges Variablenformat')
+  }
+  return obj
 }
 
 export function envNames(str, key) {