fix(core): Do not allow arbitrary path traversal in the credential-tr…

…anslation endpoint (n8n-io#5522)

packages/cli/src/Server.ts

@@ -78,7 +78,6 @@ import history from 'connect-history-api-fallback';
 import config from '@/config';
 import * as Queue from '@/Queue';
 import { InternalHooksManager } from '@/InternalHooksManager';
-import { getCredentialTranslationPath } from '@/TranslationHelpers';
 import { getSharedWorkflowIds } from '@/WorkflowHelpers';
 
 import { nodesController } from '@/api/nodes.api';
@@ -109,6 +108,7 @@ import {
 	MeController,
 	OwnerController,
 	PasswordResetController,
+	TranslationController,
 	UsersController,
 } from '@/controllers';
 import { resolveJwt } from '@/auth/jwt';
@@ -359,6 +359,7 @@ class Server extends AbstractServer {
 			new OwnerController({ config, internalHooks, repositories, logger }),
 			new MeController({ externalHooks, internalHooks, repositories, logger }),
 			new PasswordResetController({ config, externalHooks, internalHooks, repositories, logger }),
+			new TranslationController(config, this.credentialTypes),
 			new UsersController({
 				config,
 				mailer,
@@ -753,48 +754,6 @@ class Server extends AbstractServer {
 			),
 		);
 
-		this.app.get(
-			`/${this.restEndpoint}/credential-translation`,
-			ResponseHelper.send(
-				async (
-					req: express.Request & { query: { credentialType: string } },
-					res: express.Response,
-				): Promise<object | null> => {
-					const translationPath = getCredentialTranslationPath({
-						locale: this.frontendSettings.defaultLocale,
-						credentialType: req.query.credentialType,
-					});
-
-					try {
-						return require(translationPath);
-					} catch (error) {
-						return null;
-					}
-				},
-			),
-		);
-
-		// Returns node information based on node names and versions
-		const headersPath = pathJoin(NODES_BASE_DIR, 'dist', 'nodes', 'headers');
-		this.app.get(
-			`/${this.restEndpoint}/node-translation-headers`,
-			ResponseHelper.send(
-				async (req: express.Request, res: express.Response): Promise<object | void> => {
-					try {
-						await fsAccess(`${headersPath}.js`);
-					} catch (_) {
-						return; // no headers available
-					}
-
-					try {
-						return require(headersPath);
-					} catch (error) {
-						res.status(500).send('Failed to load headers file');
-					}
-				},
-			),
-		);
-
 		// ----------------------------------------
 		// Node-Types
 		// ----------------------------------------

packages/cli/src/TranslationHelpers.ts

@@ -1,7 +1,6 @@
 import { join, dirname } from 'path';
 import { readdir } from 'fs/promises';
 import type { Dirent } from 'fs';
-import { NODES_BASE_DIR } from '@/constants';
 
 const ALLOWED_VERSIONED_DIRNAME_LENGTH = [2, 3]; // e.g. v1, v10
 
@@ -47,18 +46,3 @@ export async function getNodeTranslationPath({
 		? join(nodeDir, `v${maxVersion}`, 'translations', locale, `${nodeType}.json`)
 		: join(nodeDir, 'translations', locale, `${nodeType}.json`);
 }
-
-/**
- * Get the full path to a credential translation file in `/dist`.
- */
-export function getCredentialTranslationPath({
-	locale,
-	credentialType,
-}: {
-	locale: string;
-	credentialType: string;
-}): string {
-	const credsPath = join(NODES_BASE_DIR, 'dist', 'credentials');
-
-	return join(credsPath, 'translations', locale, `${credentialType}.json`);
-}

packages/cli/src/controllers/index.ts

@@ -2,4 +2,5 @@ export { AuthController } from './auth.controller';
 export { MeController } from './me.controller';
 export { OwnerController } from './owner.controller';
 export { PasswordResetController } from './passwordReset.controller';
+export { TranslationController } from './translation.controller';
 export { UsersController } from './users.controller';

packages/cli/src/controllers/translation.controller.ts

@@ -0,0 +1,58 @@
+import type { Request } from 'express';
+import { ICredentialTypes } from 'n8n-workflow';
+import { join } from 'path';
+import { access } from 'fs/promises';
+import { Get, RestController } from '@/decorators';
+import { BadRequestError, InternalServerError } from '@/ResponseHelper';
+import { Config } from '@/config';
+import { NODES_BASE_DIR } from '@/constants';
+
+export const CREDENTIAL_TRANSLATIONS_DIR = 'n8n-nodes-base/dist/credentials/translations';
+export const NODE_HEADERS_PATH = join(NODES_BASE_DIR, 'dist/nodes/headers');
+
+export declare namespace TranslationRequest {
+	export type Credential = Request<{}, {}, {}, { credentialType: string }>;
+}
+
+@RestController('/')
+export class TranslationController {
+	constructor(private config: Config, private credentialTypes: ICredentialTypes) {}
+
+	@Get('/credential-translation')
+	async getCredentialTranslation(req: TranslationRequest.Credential) {
+		const { credentialType } = req.query;
+
+		if (!this.credentialTypes.recognizes(credentialType))
+			throw new BadRequestError(`Invalid Credential type: "${credentialType}"`);
+
+		const defaultLocale = this.config.getEnv('defaultLocale');
+		const translationPath = join(
+			CREDENTIAL_TRANSLATIONS_DIR,
+			defaultLocale,
+			`${credentialType}.json`,
+		);
+
+		try {
+			// eslint-disable-next-line @typescript-eslint/no-unsafe-return
+			return require(translationPath);
+		} catch (error) {
+			return null;
+		}
+	}
+
+	@Get('/node-translation-headers')
+	async getNodeTranslationHeaders() {
+		try {
+			await access(`${NODE_HEADERS_PATH}.js`);
+		} catch (_) {
+			return; // no headers available
+		}
+
+		try {
+			// eslint-disable-next-line @typescript-eslint/no-unsafe-return
+			return require(NODE_HEADERS_PATH);
+		} catch (error) {
+			throw new InternalServerError('Failed to load headers file');
+		}
+	}
+}

packages/cli/test/setup-mocks.ts

@@ -1,3 +1,5 @@
+import 'reflect-metadata';
+
 jest.mock('@sentry/node');
 jest.mock('@n8n_io/license-sdk');
 jest.mock('@/telemetry');

packages/cli/test/unit/controllers/translation.controller.test.ts

@@ -0,0 +1,40 @@
+import { mock } from 'jest-mock-extended';
+import type { ICredentialTypes } from 'n8n-workflow';
+import type { Config } from '@/config';
+import {
+	TranslationController,
+	TranslationRequest,
+	CREDENTIAL_TRANSLATIONS_DIR,
+} from '@/controllers/translation.controller';
+import { BadRequestError } from '@/ResponseHelper';
+
+describe('TranslationController', () => {
+	const config = mock<Config>();
+	const credentialTypes = mock<ICredentialTypes>();
+	const controller = new TranslationController(config, credentialTypes);
+
+	describe('getCredentialTranslation', () => {
+		it('should throw 400 on invalid credential types', async () => {
+			const credentialType = 'not-a-valid-credential-type';
+			const req = mock<TranslationRequest.Credential>({ query: { credentialType } });
+			credentialTypes.recognizes.calledWith(credentialType).mockReturnValue(false);
+
+			expect(controller.getCredentialTranslation(req)).rejects.toThrowError(
+				new BadRequestError(`Invalid Credential type: "${credentialType}"`),
+			);
+		});
+
+		it('should return translation json on valid credential types', async () => {
+			const credentialType = 'credential-type';
+			const req = mock<TranslationRequest.Credential>({ query: { credentialType } });
+			config.getEnv.calledWith('defaultLocale').mockReturnValue('de');
+			credentialTypes.recognizes.calledWith(credentialType).mockReturnValue(true);
+			const response = { translation: 'string' };
+			jest.mock(`${CREDENTIAL_TRANSLATIONS_DIR}/de/credential-type.json`, () => response, {
+				virtual: true,
+			});
+
+			expect(await controller.getCredentialTranslation(req)).toEqual(response);
+		});
+	});
+});