Derive encryption key in dashboard using Argon2

nodecg-io-core/dashboard/crypto.ts

@@ -1,12 +1,19 @@
-import { PersistentData, EncryptedData, decryptData } from "nodecg-io-core/extension/persistenceManager";
+import {
+    PersistentData,
+    EncryptedData,
+    decryptData,
+    deriveEncryptionKey,
+    getEncryptionSalt,
+} from "nodecg-io-core/extension/persistenceManager";
 import { EventEmitter } from "events";
 import { ObjectMap, ServiceInstance, ServiceDependency, Service } from "nodecg-io-core/extension/service";
 import { isLoaded } from "./authentication";
-import { PasswordMessage } from "nodecg-io-core/extension/messageManager";
+import { AuthenticationMessage } from "nodecg-io-core/extension/messageManager";
+import cryptoJS from "crypto-js";
 
 const encryptedData = nodecg.Replicant<EncryptedData>("encryptedConfig");
 let services: Service<unknown, never>[] | undefined;
-let password: string | undefined;
+let encryptionKey: string | undefined;
 
 /**
  * Layer between the actual dashboard and `PersistentData`.
@@ -40,71 +47,81 @@ class Config extends EventEmitter {
 }
 export const config = new Config();
 
-// Update the decrypted copy of the data once the encrypted version changes (if a password is available).
+// Update the decrypted copy of the data once the encrypted version changes (if a encryption key is available).
 // This ensures that the decrypted data is always up-to-date.
 encryptedData.on("change", updateDecryptedData);
 
 /**
  * Sets the passed password to be used by the crypto module.
- * Will try to decrypt encrypted data to tell whether the password is correct,
- * if it is wrong the internal password will be set to undefined.
+ * Uses the password to derive a decryption secret and then tries to decrypt
+ * the encrypted data to tell whether the password is correct.
+ * If it is wrong the internal encryption key will be set to undefined.
  * Returns whether the password is correct.
  * @param pw the password which should be set.
  */
 export async function setPassword(pw: string): Promise<boolean> {
     await Promise.all([
-        // Ensures that the `encryptedData` has been declared because it is needed by `setPassword()`
+        // Ensures that the `encryptedData` has been declared because it is needed to get the encrypted config.
         // This is especially needed when handling a re-connect as the replicant takes time to declare
         // and the password check is usually faster than that.
         NodeCG.waitForReplicants(encryptedData),
         fetchServices(),
     ]);
 
-    password = pw;
+    if (encryptedData.value === undefined) {
+        encryptedData.value = {};
+    }
+
+    const salt = await getEncryptionSalt(encryptedData.value, pw);
+    encryptionKey = await deriveEncryptionKey(pw, salt);
 
-    // Load framework, returns false if not already loaded and password is wrong
+    // Load framework, returns false if not already loaded and password/encryption key is wrong
     if ((await loadFramework()) === false) return false;
 
     if (encryptedData.value) {
         updateDecryptedData(encryptedData.value);
-        // Password is unset by `updateDecryptedData` if it is wrong.
-        // This may happen if the framework was already loaded and `loadFramework` didn't check the password.
-        if (password === undefined) {
+        // encryption key is unset by `updateDecryptedData` if it is wrong.
+        // This may happen if the framework was already loaded and `loadFramework` didn't check the password/encryption key.
+        if (encryptionKey === undefined) {
             return false;
         }
     }
 
     return true;
 }
 
-export async function sendAuthenticatedMessage<V>(messageName: string, message: Partial<PasswordMessage>): Promise<V> {
-    if (password === undefined) throw "No password available";
+export async function sendAuthenticatedMessage<V>(
+    messageName: string,
+    message: Partial<AuthenticationMessage>,
+): Promise<V> {
+    if (encryptionKey === undefined) throw "Can't send authenticated message: crypto module not authenticated";
     const msgWithAuth = Object.assign({}, message);
-    msgWithAuth.password = password;
+    msgWithAuth.encryptionKey = encryptionKey;
     return await nodecg.sendMessage(messageName, msgWithAuth);
 }
 
 /**
- * Returns whether a password has been set in the crypto module aka. whether it is authenticated.
+ * Returns whether a password derived encryption key has been set in the crypto module aka. whether it is authenticated.
  */
 export function isPasswordSet(): boolean {
-    return password !== undefined;
+    return encryptionKey !== undefined;
 }
 
 /**
- * Decrypts the passed data using the global password variable and saves it into `ConfigData`.
- * Unsets the password if its wrong and also forwards `undefined` to `ConfigData` if the password is unset.
+ * Decrypts the passed data using the global encryptionKey variable and saves it into `ConfigData`.
+ * Clears the encryption key if its wrong and also forwards `undefined` to `ConfigData` if the encryption key is unset.
  * @param data the data that should be decrypted.
  */
 function updateDecryptedData(data: EncryptedData): void {
     let result: PersistentData | undefined = undefined;
-    if (password !== undefined && data.cipherText) {
-        const res = decryptData(data.cipherText, password);
+    if (encryptionKey !== undefined && data.cipherText) {
+        const passwordWordArray = cryptoJS.enc.Hex.parse(encryptionKey);
+        const res = decryptData(data.cipherText, passwordWordArray, data.iv);
         if (!res.failed) {
             result = res.result;
         } else {
-            // Password is wrong
-            password = undefined;
+            // Secret is wrong
+            encryptionKey = undefined;
         }
     }
 
@@ -135,7 +152,7 @@ async function loadFramework(): Promise<boolean> {
     if (await isLoaded()) return true;
 
     try {
-        await nodecg.sendMessage("load", { password });
+        await nodecg.sendMessage("load", { encryptionKey });
         return true;
     } catch {
         return false;

nodecg-io-core/extension/__tests__/mocks.ts

@@ -1,4 +1,4 @@
-import { ObjectMap, ServiceInstance } from "../service";
+import { ObjectMap, ServiceInstance, Service } from "../service";
 import NodeCG from "@nodecg/types";
 import { EventEmitter } from "events";
 
@@ -162,6 +162,24 @@ export const testService = {
     },
 };
 
+export const websocketServerService: Service<{ port: number }, void> = {
+    serviceType: "websocket-server",
+    validateConfig: jest.fn(),
+    createClient: jest.fn(),
+    stopClient: jest.fn(),
+    reCreateClientToRemoveHandlers: false,
+    requiresNoConfig: false,
+    schema: {
+        $schema: "http://json-schema.org/draft-07/schema#",
+        type: "object",
+        properties: {
+            port: {
+                type: "integer",
+            },
+        },
+    },
+};
+
 export const testServiceInstance: ServiceInstance<string, () => string> = {
     serviceType: testService.serviceType,
     config: "hello world",