fix(api): security hardening — helmet + auth rate limiting (#641)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

apps/api/package.json

@@ -62,6 +62,7 @@
     "discord.js": "^14.25.1",
     "dockerode": "^4.0.9",
     "gray-matter": "^4.0.3",
+    "helmet": "^8.1.0",
     "highlight.js": "^11.11.1",
     "ioredis": "^5.9.2",
     "jose": "^6.1.3",

apps/api/src/auth/auth.controller.ts

@@ -106,7 +106,7 @@ export class AuthController {
   // @SkipCsrf avoids double-protection conflicts.
   // See: https://www.better-auth.com/docs/reference/security
   @SkipCsrf()
-  @Throttle({ strict: { limit: 10, ttl: 60000 } })
+  @Throttle({ default: { ttl: 60_000, limit: 5 } })
   async handleAuth(@Req() req: ExpressRequest, @Res() res: ExpressResponse): Promise<void> {
     // Extract client IP for logging
     const clientIp = this.getClientIp(req);

apps/api/src/main.ts

@@ -1,6 +1,7 @@
 import { NestFactory } from "@nestjs/core";
 import { RequestMethod, ValidationPipe } from "@nestjs/common";
 import cookieParser from "cookie-parser";
+import helmet from "helmet";
 import { AppModule } from "./app.module";
 import { getTrustedOrigins } from "./auth/auth.config";
 import { GlobalExceptionFilter } from "./filters/global-exception.filter";
@@ -33,6 +34,14 @@ async function bootstrap() {
   // Enable cookie parser for session handling
   app.use(cookieParser());
 
+  // Enable helmet security headers
+  app.use(
+    helmet({
+      contentSecurityPolicy: false, // Let Next.js handle CSP
+      crossOriginEmbedderPolicy: false,
+    })
+  );
+
   // Enable global validation pipe with transformation
   app.useGlobalPipes(
     new ValidationPipe({

pnpm-lock.yaml

@@ -180,6 +180,9 @@ importers:
       gray-matter:
         specifier: ^4.0.3
         version: 4.0.3
+      helmet:
+        specifier: ^8.1.0
+        version: 8.1.0
       highlight.js:
         specifier: ^11.11.1
         version: 11.11.1
@@ -5210,6 +5213,10 @@ packages:
     resolution: {integrity: sha512-0hJU9SCPvmMzIBdZFqNPXWa6dqh7WdH0cII9y+CyS8rG3nL48Bclra9HmKhVVUHyPWNH5Y7xDwAB7bfgSjkUMQ==}
     engines: {node: '>= 0.4'}
 
+  helmet@8.1.0:
+    resolution: {integrity: sha512-jOiHyAZsmnr8LqoPGmCjYAaiuWwjAPLgY8ZX2XrmHawt99/u1y6RgrZMTeoPfpUbV96HOalYgz1qzkRbw54Pmg==}
+    engines: {node: '>=18.0.0'}
+
   highlight.js@11.11.1:
     resolution: {integrity: sha512-Xwwo44whKBVCYoliBQwaPvtd/2tYFkRQtXDWj1nackaV2JPXx3L0+Jvd8/qCJ2p+ML0/XVkJ2q+Mr+UVdpJK5w==}
     engines: {node: '>=12.0.0'}
@@ -12815,6 +12822,8 @@ snapshots:
     dependencies:
       function-bind: 1.1.2
 
+  helmet@8.1.0: {}
+
   highlight.js@11.11.1: {}
 
   html-encoding-sniffer@4.0.0: