feat(security): add CSRF protection for all state-changing API routes

- Synchronizer token stored in session; GET /auth/csrf to obtain it
- csrfProtection middleware requires X-CSRF-Token on non-safe methods
- customFetch injects the header via setCsrfTokenGetter
- toolrate boot loads token; reload after local login (session regenerate)
- OpenAPI GET /auth/csrf + CsrfToken schema, orval regenerated

artifacts/api-server/src/middleware/csrf.ts

@@ -0,0 +1,25 @@
+import crypto from "node:crypto";
+import type { Request, Response, NextFunction } from "express";
+
+const SAFE_METHODS = new Set(["GET", "HEAD", "OPTIONS", "TRACE"]);
+
+export function getCsrfToken(req: Request): string {
+  if (!req.session.csrfToken) {
+    req.session.csrfToken = crypto.randomBytes(24).toString("hex");
+  }
+  return req.session.csrfToken;
+}
+
+export function csrfProtection(req: Request, res: Response, next: NextFunction): void {
+  if (SAFE_METHODS.has(req.method.toUpperCase())) {
+    next();
+    return;
+  }
+  const provided = req.headers["x-csrf-token"];
+  const token = getCsrfToken(req);
+  if (typeof provided === "string" && provided && provided === token) {
+    next();
+    return;
+  }
+  res.status(403).json({ error: "CSRF token missing or invalid" });
+}

artifacts/api-server/src/routes/auth.ts

@@ -8,6 +8,7 @@ import { logger } from "../lib/logger";
 import { writeAuditLog } from "../lib/audit";
 import { loginRateLimit, passwordRateLimit } from "../lib/rate-limit";
 import { getEntitlements, requireFeature } from "../middleware/feature";
+import { getCsrfToken } from "../middleware/csrf";
 
 const router: IRouter = Router();
 
@@ -109,6 +110,10 @@ router.get("/auth/mode", (_req, res): void => {
   res.json({ mode: isOidcConfigured() ? "oidc" : "local" });
 });
 
+router.get("/auth/csrf", (req, res): void => {
+  res.json({ token: getCsrfToken(req) });
+});
+
 router.post("/auth/login", loginRateLimit, async (req, res): Promise<void> => {
   if (isOidcConfigured()) {
     res.status(400).json({ error: "Use OIDC login when Keycloak is configured." });

artifacts/api-server/src/routes/index.ts

@@ -8,9 +8,12 @@ import usersRouter from "./users";
 import auditRouter from "./audit";
 import costsRouter from "./costs";
 import adminRouter from "./admin";
+import { csrfProtection } from "../middleware/csrf";
 
 const router: IRouter = Router();
 
+router.use(csrfProtection);
+
 router.use(authRouter);
 router.use(healthRouter);
 router.use(toolsRouter);

artifacts/api-server/src/types/session.d.ts

@@ -14,5 +14,6 @@ declare module "express-session" {
     codeVerifier?: string;
     returnTo?: string;
     oidcState?: string;
+    csrfToken?: string;
   }
 }

artifacts/toolrate/src/App.tsx

@@ -1,7 +1,9 @@
 import { Switch, Route, Router as WouterRouter } from "wouter";
+import { useEffect } from "react";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import { I18nextProvider } from "react-i18next";
 import i18n from "@/i18n";
+import { loadCsrfToken } from "@/lib/csrf";
 import { Toaster } from "@/components/ui/toaster";
 import { TooltipProvider } from "@/components/ui/tooltip";
 
@@ -50,6 +52,9 @@ function Router() {
 }
 
 function App() {
+  useEffect(() => {
+    void loadCsrfToken();
+  }, []);
   return (
     <I18nextProvider i18n={i18n}>
       <QueryClientProvider client={queryClient}>

artifacts/toolrate/src/lib/csrf.ts

@@ -0,0 +1,27 @@
+import { setCsrfTokenGetter } from "@workspace/api-client-react";
+
+let token: string | null = null;
+
+setCsrfTokenGetter(() => token);
+
+export function getCsrfToken(): string | null {
+  return token;
+}
+
+export async function loadCsrfToken(): Promise<string | null> {
+  try {
+    const res = await fetch(`/api/auth/csrf`, {
+      credentials: "include",
+    });
+    if (!res.ok) {
+      token = null;
+      return null;
+    }
+    const data = (await res.json()) as { token?: string };
+    token = data.token ?? null;
+    return token;
+  } catch {
+    token = null;
+    return null;
+  }
+}

artifacts/toolrate/src/pages/login.tsx

@@ -6,6 +6,7 @@ import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
 import { PasswordInput } from "@/components/password-input";
+import { loadCsrfToken } from "@/lib/csrf";
 import { Card, CardContent, CardHeader, CardTitle, CardDescription } from "@/components/ui/card";
 import { ThemeToggle } from "@/components/theme-toggle";
 import { Wrench, AlertCircle } from "lucide-react";
@@ -33,6 +34,7 @@ export default function Login() {
       {
         onSuccess: () => {
           queryClient.invalidateQueries();
+          void loadCsrfToken();
           setLocation(returnTo);
         },
         onError: (err) => {

lib/api-client-react/src/custom-fetch.ts

@@ -17,6 +17,7 @@ const DEFAULT_JSON_ACCEPT = "application/json, application/problem+json";
 
 let _baseUrl: string | null = null;
 let _authTokenGetter: AuthTokenGetter | null = null;
+let _csrfTokenGetter: (() => string | null) | null = null;
 
 /**
  * Set a base URL that is prepended to every relative request URL
@@ -44,6 +45,15 @@ export function setAuthTokenGetter(getter: AuthTokenGetter | null): void {
   _authTokenGetter = getter;
 }
 
+/**
+ * Register a getter that supplies a CSRF token.  Before every state-changing
+ * fetch an `X-CSRF-Token` header is attached when the getter returns a value.
+ * Pass `null` to clear the getter.
+ */
+export function setCsrfTokenGetter(getter: (() => string | null) | null): void {
+  _csrfTokenGetter = getter;
+}
+
 function isRequest(input: RequestInfo | URL): input is Request {
   return typeof Request !== "undefined" && input instanceof Request;
 }
@@ -349,6 +359,14 @@ export async function customFetch<T = unknown>(
     headers.set("accept", DEFAULT_JSON_ACCEPT);
   }
 
+  // Attach CSRF token for state-changing requests, unless one is already set.
+  if (_csrfTokenGetter && !headers.has("x-csrf-token")) {
+    const csrf = _csrfTokenGetter();
+    if (csrf) {
+      headers.set("x-csrf-token", csrf);
+    }
+  }
+
   // Attach bearer token when an auth getter is configured and no
   // Authorization header has been explicitly provided.
   if (_authTokenGetter && !headers.has("authorization")) {

lib/api-client-react/src/generated/api.schemas.ts

@@ -30,6 +30,10 @@ export interface AuthMode {
   mode: AuthModeMode;
 }
 
+export interface CsrfToken {
+  token: string;
+}
+
 export interface LocalLoginInput {
   username: string;
   password: string;

lib/api-client-react/src/generated/api.ts

@@ -26,6 +26,7 @@ import type {
   AuthUser,
   CategoryStats,
   ChangePasswordInput,
+  CsrfToken,
   EmptyTrash200,
   ErrorResponse,
   GetRatingDistributionParams,
@@ -1906,6 +1907,83 @@ export function useGetAuthMode<TData = Awaited<ReturnType<typeof getAuthMode>>,
 
 
 
+export const getGetCsrfTokenUrl = () => {
+
+
+
+
+  return `/api/auth/csrf`
+}
+
+/**
+ * @summary Get a CSRF token for state-changing requests
+ */
+export const getCsrfToken = async ( options?: RequestInit): Promise<CsrfToken> => {
+
+  return customFetch<CsrfToken>(getGetCsrfTokenUrl(),
+  {
+    ...options,
+    method: 'GET'
+
+
+  }
+);}
+
+
+
+
+
+export const getGetCsrfTokenQueryKey = () => {
+    return [
+    `/api/auth/csrf`
+    ] as const;
+    }
+
+
+export const getGetCsrfTokenQueryOptions = <TData = Awaited<ReturnType<typeof getCsrfToken>>, TError = ErrorType<unknown>>( options?: { query?:UseQueryOptions<Awaited<ReturnType<typeof getCsrfToken>>, TError, TData>, request?: SecondParameter<typeof customFetch>}
+) => {
+
+const {query: queryOptions, request: requestOptions} = options ?? {};
+
+  const queryKey =  queryOptions?.queryKey ?? getGetCsrfTokenQueryKey();
+
+
+
+    const queryFn: QueryFunction<Awaited<ReturnType<typeof getCsrfToken>>> = ({ signal }) => getCsrfToken({ signal, ...requestOptions });
+
+
+
+
+
+   return  { queryKey, queryFn, ...queryOptions} as UseQueryOptions<Awaited<ReturnType<typeof getCsrfToken>>, TError, TData> & { queryKey: QueryKey }
+}
+
+export type GetCsrfTokenQueryResult = NonNullable<Awaited<ReturnType<typeof getCsrfToken>>>
+export type GetCsrfTokenQueryError = ErrorType<unknown>
+
+
+/**
+ * @summary Get a CSRF token for state-changing requests
+ */
+
+export function useGetCsrfToken<TData = Awaited<ReturnType<typeof getCsrfToken>>, TError = ErrorType<unknown>>(
+  options?: { query?:UseQueryOptions<Awaited<ReturnType<typeof getCsrfToken>>, TError, TData>, request?: SecondParameter<typeof customFetch>}
+
+ ):  UseQueryResult<TData, TError> & { queryKey: QueryKey } {
+
+  const queryOptions = getGetCsrfTokenQueryOptions(options)
+
+  const query = useQuery(queryOptions) as  UseQueryResult<TData, TError> & { queryKey: QueryKey };
+
+  return { ...query, queryKey: queryOptions.queryKey };
+}
+
+
+
+
+
+
+
 export const getLocalLoginUrl = () => {
 
 

lib/api-client-react/src/index.ts

@@ -1,4 +1,4 @@
 export * from "./generated/api";
 export * from "./generated/api.schemas";
-export { setBaseUrl, setAuthTokenGetter, customFetch } from "./custom-fetch";
+export { setBaseUrl, setAuthTokenGetter, setCsrfTokenGetter, customFetch } from "./custom-fetch";
 export type { AuthTokenGetter } from "./custom-fetch";

lib/api-spec/openapi.yaml

@@ -570,6 +570,19 @@ paths:
               schema:
                 $ref: "#/components/schemas/AuthMode"
 
+  /auth/csrf:
+    get:
+      operationId: getCsrfToken
+      tags: [auth]
+      summary: Get a CSRF token for state-changing requests
+      responses:
+        "200":
+          description: CSRF token
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/CsrfToken"
+
   /auth/login:
     post:
       operationId: localLogin
@@ -942,6 +955,13 @@ components:
           type: string
           enum: [oidc, local]
 
+    CsrfToken:
+      type: object
+      required: [token]
+      properties:
+        token:
+          type: string
+
     LocalLoginInput:
       type: object
       required: [username, password]

lib/api-zod/src/generated/api.ts

@@ -445,6 +445,14 @@ export const GetAuthModeResponse = zod.object({
 })
 
 
+/**
+ * @summary Get a CSRF token for state-changing requests
+ */
+export const GetCsrfTokenResponse = zod.object({
+  "token": zod.string()
+})
+
+
 /**
  * @summary Local username/password login
  */

lib/api-zod/src/generated/types/csrfToken.ts

@@ -0,0 +1,11 @@
+/**
+ * Generated by orval v8.9.1 🍺
+ * Do not edit manually.
+ * Api
+ * ToolRate API — Tool listing and rating platform
+ * OpenAPI spec version: 0.1.0
+ */
+
+export interface CsrfToken {
+  token: string;
+}

lib/api-zod/src/generated/types/index.ts

@@ -15,6 +15,7 @@ export * from './authUserRole';
 export * from './authUserTier';
 export * from './categoryStats';
 export * from './changePasswordInput';
+export * from './csrfToken';
 export * from './emptyTrash200';
 export * from './errorResponse';
 export * from './getRatingDistributionParams';