feat(013-auth-hardening): password reset, password strength policy, login rate-limiting

Closes the two gaps 010-identity-auth explicitly deferred (password reset,
login rate-limiting), plus a shared password-strength validator both the
reset-consume endpoint and admin account creation now depend on.

- Password reset: single-use, paired-Redis-key tokens (never in Postgres),
  identical response regardless of account existence, stubbed delivery via
  a structured log line (no email infrastructure exists yet).
- Password strength: one validatePasswordStrength() call site, wired into
  both POST /admin/users and the reset-consume flow.
- Login rate-limiting: checkRateLimit keyed by submitted email, checked
  before any credential verification.

Also fixes tests/helpers/auth.ts's shared loginAs() helper, which reused
two fixed accounts across the whole integration suite via upsert — now
rate-limited per email, that collided across ~30 files sharing one budget.
Each call now gets a unique email; no call sites needed to change.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

specs/013-auth-hardening/checklists/requirements.md

@@ -43,3 +43,25 @@
   direct, unavoidable dependency of User Story 1 — a password-reset flow that accepts any
   password would be hardening one gap while leaving the other wide open at the same door.
 - All items pass; no revision iterations were needed.
+
+## Implementation Notes (post-build)
+
+- `tests/helpers/auth.ts`'s shared `loginAs()` helper previously reused two fixed accounts
+  (`test-admin@supporthub.test` / `test-agent@supporthub.test`) across every integration test
+  file via `upsert`. Once login became rate-limited per email (User Story 3), the ~30 files that
+  each call it once in their own `beforeAll` collectively exceeded the attempt budget for those
+  two shared addresses well before most files' own tests ran, turning their legitimate logins
+  into `429`s. Fixed by giving each `loginAs()` call its own unique, randomly-suffixed email —
+  nothing in the suite depended on the literal fixed addresses, so no call sites needed to
+  change, only the helper itself.
+- While re-running the full suite for regression, `tests/integration/orchestration-strategies.test.ts`'s
+  "SKILL_BASED prefers the eligible agent with the higher proficiency level" test was found
+  failing (picks the lower-proficiency agent). Verified via `git stash` that this reproduces
+  identically on the clean pre-013 `HEAD` with none of this feature's changes present — it is a
+  pre-existing bug in 007-orchestration-assignment's `SKILL_BASED` strategy, unrelated to and out
+  of scope for this feature. Left unfixed here; worth its own follow-up.
+- `tests/integration/ticket-attachments.test.ts`'s 2 known MinIO-dependent failures (accepted
+  baseline, this project doesn't run MinIO) remain unchanged by this feature.
+- All other integration and unit tests pass, including 010-identity-auth's own login/admin-account
+  tests, confirming no regression from `AuthService.login`'s new rate-limit check or the shared
+  `validatePasswordStrength` call added to `UsersService.create`.

specs/013-auth-hardening/tasks.md

@@ -23,7 +23,7 @@ All file paths are relative to `supporthub-api/` (repo root).
 
 ## Phase 1: Foundational (Blocking Prerequisites)
 
-- [ ] T001 Add `PASSWORD_MIN_LENGTH` (default `10`),
+- [x] T001 Add `PASSWORD_MIN_LENGTH` (default `10`),
       `PASSWORD_RESET_TOKEN_LIFETIME_MINUTES` (default `30`),
       `LOGIN_RATE_LIMIT_MAX_ATTEMPTS` (default `5`), and `LOGIN_RATE_LIMIT_WINDOW_SECONDS`
       (default `300`) to `src/config/env.ts`, exposed via `src/config/auth.ts`'s existing
@@ -42,18 +42,18 @@ the existing admin account-creation endpoint.
 
 ### Tests for User Story 2
 
-- [ ] T002 [P] [US2] Unit test for `validatePasswordStrength` (too-short rejected with the
+- [x] T002 [P] [US2] Unit test for `validatePasswordStrength` (too-short rejected with the
       actual minimum named; policy-meeting password passes) in
       `tests/unit/identity/password-policy.test.ts`
 
 ### Implementation for User Story 2
 
-- [ ] T003 [US2] Add `identity/auth/mapper/password-policy.ts`'s
+- [x] T003 [US2] Add `identity/auth/mapper/password-policy.ts`'s
       `validatePasswordStrength(password): void`, throwing `ValidationError` (depends on T001)
-- [ ] T004 [US2] Export it from `identity/auth`'s public `index.ts` (depends on T003)
-- [ ] T005 [US2] Call it from `identity/agents/service/users.service.ts`'s `UsersService.create`,
+- [x] T004 [US2] Export it from `identity/auth`'s public `index.ts` (depends on T003)
+- [x] T005 [US2] Call it from `identity/agents/service/users.service.ts`'s `UsersService.create`,
       before hashing (depends on T004)
-- [ ] T006 [US2] Run Quickstart Scenario 2 step 1 locally and confirm it passes; re-run
+- [x] T006 [US2] Run Quickstart Scenario 2 step 1 locally and confirm it passes; re-run
       010-identity-auth's own existing `POST /admin/users` tests to confirm no regression
 
 **Checkpoint**: No password shorter than the policy can ever be set via the admin endpoint.
@@ -68,31 +68,31 @@ the existing admin account-creation endpoint.
 
 ### Tests for User Story 1
 
-- [ ] T007 [US1] Integration test covering Quickstart Scenario 1 (request issues a token via
+- [x] T007 [US1] Integration test covering Quickstart Scenario 1 (request issues a token via
       the log stub; a nonexistent email gets an identical response; consume succeeds once and
       fails the second time; login works with the new password and fails with the old) in
       `tests/integration/password-reset-flow.test.ts` (depends on T006)
 
 ### Implementation for User Story 1
 
-- [ ] T008 [US1] Add `identity/auth/mapper/reset-token.ts` — `generateResetToken()` (raw token +
+- [x] T008 [US1] Add `identity/auth/mapper/reset-token.ts` — `generateResetToken()` (raw token +
       its SHA-256 hash) (depends on T001)
-- [ ] T009 [US1] Add `identity/auth/repository/reset-token.repository.ts` — `issue(userId,
+- [x] T009 [US1] Add `identity/auth/repository/reset-token.repository.ts` — `issue(userId,
       tokenHash, ttlSeconds)` (deletes any prior token for this user first, per data-model.md's
       paired-key shape), `resolve(tokenHash)` (returns `userId` or null), `consume(tokenHash,
       userId)` (deletes both keys) (depends on T008)
-- [ ] T010 [US1] Add `AuthService.requestPasswordReset(email)`: always returns the same public
+- [x] T010 [US1] Add `AuthService.requestPasswordReset(email)`: always returns the same public
       result; internally, if the email resolves to an active account, issues a token and logs
       the stub delivery event (structured log, research.md) (depends on T009)
-- [ ] T011 [US1] Add `AuthService.resetPassword(token, newPassword)`: validates password
+- [x] T011 [US1] Add `AuthService.resetPassword(token, newPassword)`: validates password
       strength first (depends on T004), then resolves/consumes the token, 400s with a specific
       reason if the token is missing/expired/used, hashes and stores the new password (depends
       on T009, T004)
-- [ ] T012 [US1] Add `POST /auth/password-reset/request` and `POST /auth/password-reset/consume`
+- [x] T012 [US1] Add `POST /auth/password-reset/request` and `POST /auth/password-reset/consume`
       (both ungated — no session exists yet) in `identity/auth/controller/` + `routes/` +
       `schema/`, registered from `src/api/routes.ts` (already registers `authRoutes` as a
       whole, so no new registration call needed — depends on T010, T011)
-- [ ] T013 [US1] Run Quickstart Scenario 1 locally and confirm all 5 steps pass
+- [x] T013 [US1] Run Quickstart Scenario 1 locally and confirm all 5 steps pass
 
 **Checkpoint**: A locked-out user has a real, working self-service fix.
 
@@ -107,21 +107,21 @@ credential verification.
 
 ### Tests for User Story 3
 
-- [ ] T014 [P] [US3] Unit test confirming the rate-limit check is invoked before
+- [x] T014 [P] [US3] Unit test confirming the rate-limit check is invoked before
       `repo.findByEmail`/`verifyPassword` in `AuthService.login` (a fake repo/mapper that would
       throw if called after an already-exceeded limit) in
       `tests/unit/identity/login-rate-limit-ordering.test.ts`
-- [ ] T015 [US3] Integration test covering Quickstart Scenario 3 (N attempts get 401, the N+1th
+- [x] T015 [US3] Integration test covering Quickstart Scenario 3 (N attempts get 401, the N+1th
       — even with the correct password — gets 429, a different email is unaffected) in
       `tests/integration/login-rate-limit.test.ts` (depends on T001)
 
 ### Implementation for User Story 3
 
-- [ ] T016 [US3] In `AuthService.login`, call the existing
+- [x] T016 [US3] In `AuthService.login`, call the existing
       `checkRateLimit(`login:${email}`, authConfig.loginRateLimitMaxAttempts,
       authConfig.loginRateLimitWindowSeconds)` (from `@/infrastructure/cache`) as the very first
       step, throwing `RateLimitError` if exceeded (depends on T001)
-- [ ] T017 [US3] Run Quickstart Scenario 3 locally and confirm all 3 steps pass
+- [x] T017 [US3] Run Quickstart Scenario 3 locally and confirm all 3 steps pass
 
 **Checkpoint**: All three user stories work independently and together — this feature's full
 scope.
@@ -130,10 +130,10 @@ scope.
 
 ## Phase 5: Polish & Cross-Cutting Concerns
 
-- [ ] T018 [P] Update `specs/013-auth-hardening/checklists/requirements.md` Notes with any
+- [x] T018 [P] Update `specs/013-auth-hardening/checklists/requirements.md` Notes with any
       implementation-time findings
-- [ ] T019 Run `npx tsx scripts/check-architecture.ts` and `npm run lint`/`npm run typecheck`
-- [ ] T020 Full regression: `npm run test:unit` then the full integration suite against real
+- [x] T019 Run `npx tsx scripts/check-architecture.ts` and `npm run lint`/`npm run typecheck`
+- [x] T020 Full regression: `npm run test:unit` then the full integration suite against real
       Docker-provisioned Postgres/Redis, confirming nothing outside this feature regressed
       (particularly 010-identity-auth's own login/admin-account tests, now touched by this
       feature's changes)

src/config/auth.ts

@@ -3,4 +3,8 @@ import { env } from './env';
 export const authConfig = {
   jwtSecret: env.JWT_SECRET,
   tokenLifetimeHours: env.AUTH_TOKEN_LIFETIME_HOURS,
+  passwordMinLength: env.PASSWORD_MIN_LENGTH,
+  passwordResetTokenLifetimeMinutes: env.PASSWORD_RESET_TOKEN_LIFETIME_MINUTES,
+  loginRateLimitMaxAttempts: env.LOGIN_RATE_LIMIT_MAX_ATTEMPTS,
+  loginRateLimitWindowSeconds: env.LOGIN_RATE_LIMIT_WINDOW_SECONDS,
 };

src/config/env.ts

@@ -65,6 +65,15 @@ const envSchema = z.object({
   // already-required JWT_SECRET above (defined since the original scaffold, never consumed
   // until now) — see specs/010-identity-auth/research.md.
   AUTH_TOKEN_LIFETIME_HOURS: z.coerce.number().default(4),
+
+  // Authentication Hardening (013) — password-strength policy, reset-token lifetime, and
+  // login rate-limiting, all CONFIGURABLE per docs/10-implementation-roadmap.md's own
+  // "never hardcode a placeholder value and ship it as final" instruction — see
+  // specs/013-auth-hardening/research.md.
+  PASSWORD_MIN_LENGTH: z.coerce.number().default(10),
+  PASSWORD_RESET_TOKEN_LIFETIME_MINUTES: z.coerce.number().default(30),
+  LOGIN_RATE_LIMIT_MAX_ATTEMPTS: z.coerce.number().default(5),
+  LOGIN_RATE_LIMIT_WINDOW_SECONDS: z.coerce.number().default(300),
 });
 
 export type EnvConfig = z.infer<typeof envSchema>;

src/modules/identity/agents/service/users.service.ts

@@ -1,16 +1,19 @@
 import { User } from '@prisma/client';
 import { ConflictError } from '@/common/errors';
-import { hashPassword } from '@/modules/identity/auth';
+import { hashPassword, validatePasswordStrength } from '@/modules/identity/auth';
 import { usersRepository, UsersRepository } from '../repository';
 import { CreateUserBody } from '../schema';
 
 export class UsersService {
   constructor(private readonly repo: UsersRepository = usersRepository) {}
 
-  /** FR-008: rejects a duplicate email — never a second account silently sharing one. */
+  /** FR-008: rejects a duplicate email — never a second account silently sharing one.
+   * 013-auth-hardening FR-005: the same password-strength policy every password-setting call
+   * site enforces. */
   async create(body: CreateUserBody): Promise<Omit<User, 'passwordHash'>> {
     const existing = await this.repo.findByEmail(body.email);
     if (existing) throw new ConflictError('An account with this email already exists.');
+    validatePasswordStrength(body.password);
 
     const passwordHash = await hashPassword(body.password);
     const user = await this.repo.create({

src/modules/identity/auth/controller/auth.controller.ts

@@ -1,7 +1,7 @@
 import { FastifyReply, FastifyRequest } from 'fastify';
 import { AuthenticationError } from '@/common/errors';
 import { authService, AuthService } from '../service';
-import { loginSchema } from '../schema';
+import { loginSchema, requestPasswordResetSchema, resetPasswordSchema } from '../schema';
 
 function bearerToken(request: FastifyRequest): string {
   const header = request.headers.authorization;
@@ -29,6 +29,26 @@ export class AuthController {
     await this.service.logout(bearerToken(request));
     return reply.status(200).send({ success: true, data: { loggedOut: true }, meta: null });
   }
+
+  /** 013-auth-hardening FR-001/SC-001: identical response regardless of account existence —
+   * the service itself is what decides whether a real token gets issued. */
+  async requestPasswordReset(request: FastifyRequest, reply: FastifyReply) {
+    const { email } = requestPasswordResetSchema.parse(request.body);
+    await this.service.requestPasswordReset(email);
+    return reply.status(200).send({
+      success: true,
+      data: { message: 'If that account exists, a reset link has been sent.' },
+      meta: null,
+    });
+  }
+
+  async resetPassword(request: FastifyRequest, reply: FastifyReply) {
+    const { token, newPassword } = resetPasswordSchema.parse(request.body);
+    await this.service.resetPassword(token, newPassword);
+    return reply
+      .status(200)
+      .send({ success: true, data: { message: 'Password updated.' }, meta: null });
+  }
 }
 
 export const authController = new AuthController();

src/modules/identity/auth/index.ts

@@ -4,4 +4,5 @@ export { requireRole } from './service';
 export type { LoginBody } from './schema';
 export type { LoginResult } from './service';
 export { hashPassword, verifyPassword, signToken, verifyToken, toAuthUser } from './mapper';
+export { validatePasswordStrength } from './mapper';
 export { AUTH_CONSTANTS } from './constants';

src/modules/identity/auth/mapper/index.ts

@@ -1 +1,3 @@
 export * from './auth.mapper';
+export * from './password-policy';
+export * from './reset-token';

src/modules/identity/auth/mapper/password-policy.ts

@@ -0,0 +1,13 @@
+import { ValidationError } from '@/common/errors';
+import { authConfig } from '@/config';
+
+/** 013-auth-hardening FR-005: the one password-strength rule, enforced identically everywhere
+ * a password is ever set (010's own POST /admin/users and this feature's own password-reset
+ * consume endpoint) — never duplicated or allowed to drift between call sites. */
+export function validatePasswordStrength(password: string): void {
+  if (password.length < authConfig.passwordMinLength) {
+    throw new ValidationError(
+      `Password must be at least ${authConfig.passwordMinLength} characters.`,
+    );
+  }
+}

src/modules/identity/auth/mapper/reset-token.ts

@@ -0,0 +1,18 @@
+import { randomBytes, createHash } from 'crypto';
+
+export interface GeneratedResetToken {
+  token: string;
+  tokenHash: string;
+}
+
+/** 013-auth-hardening: the raw token is what gets "delivered" (logged, per the stub decision,
+ * research.md); only its SHA-256 hash is ever persisted (data-model.md) — mirrors this
+ * codebase's own password-hashing discipline, never storing a usable secret at rest. */
+export function generateResetToken(): GeneratedResetToken {
+  const token = randomBytes(32).toString('hex');
+  return { token, tokenHash: hashResetToken(token) };
+}
+
+export function hashResetToken(token: string): string {
+  return createHash('sha256').update(token).digest('hex');
+}

src/modules/identity/auth/repository/auth.repository.ts

@@ -14,6 +14,11 @@ export class AuthRepository {
     if (!user || !user.active) return null;
     return user;
   }
+
+  /** 013-auth-hardening: applies a password-reset's new hash. */
+  async updatePassword(id: string, passwordHash: string): Promise<void> {
+    await this.prisma.user.update({ where: { id }, data: { passwordHash } });
+  }
 }
 
 export const authRepository = new AuthRepository();

src/modules/identity/auth/repository/index.ts

@@ -1 +1,2 @@
 export * from './auth.repository';
+export * from './reset-token.repository';

src/modules/identity/auth/repository/reset-token.repository.ts

@@ -0,0 +1,30 @@
+import { cacheService } from '@/infrastructure/cache';
+
+const TOKEN_KEY_PREFIX = 'password-reset:token:';
+const USER_KEY_PREFIX = 'password-reset:user:';
+
+/** 013-auth-hardening data-model.md: two paired Redis keys per active reset token — the same
+ * Redis-key-with-TTL shape as 010's own revocation denylist. Only one active token exists per
+ * user at any time (FR-002): issuing a new one deletes the prior token's own key. */
+export class ResetTokenRepository {
+  async issue(userId: string, tokenHash: string, ttlSeconds: number): Promise<void> {
+    const priorHash = await cacheService.get<string>(`${USER_KEY_PREFIX}${userId}`);
+    if (priorHash) {
+      await cacheService.del(`${TOKEN_KEY_PREFIX}${priorHash}`);
+    }
+    await cacheService.set(`${TOKEN_KEY_PREFIX}${tokenHash}`, userId, ttlSeconds);
+    await cacheService.set(`${USER_KEY_PREFIX}${userId}`, tokenHash, ttlSeconds);
+  }
+
+  async resolve(tokenHash: string): Promise<string | null> {
+    return cacheService.get<string>(`${TOKEN_KEY_PREFIX}${tokenHash}`);
+  }
+
+  /** Single-use (FR-002/SC-002): deletes both keys for this token/user pair. */
+  async consume(tokenHash: string, userId: string): Promise<void> {
+    await cacheService.del(`${TOKEN_KEY_PREFIX}${tokenHash}`);
+    await cacheService.del(`${USER_KEY_PREFIX}${userId}`);
+  }
+}
+
+export const resetTokenRepository = new ResetTokenRepository();

src/modules/identity/auth/routes/auth.routes.ts

@@ -11,4 +11,12 @@ export async function authRoutes(fastify: FastifyInstance): Promise<void> {
   fastify.post('/auth/logout', { preHandler: fastify.authenticate }, (req, reply) =>
     authController.handleLogout(req, reply),
   );
+
+  // 013-auth-hardening: ungated, like login itself — the caller has no session yet.
+  fastify.post('/auth/password-reset/request', (req, reply) =>
+    authController.requestPasswordReset(req, reply),
+  );
+  fastify.post('/auth/password-reset/consume', (req, reply) =>
+    authController.resetPassword(req, reply),
+  );
 }

src/modules/identity/auth/schema/auth.schema.ts

@@ -8,3 +8,21 @@ export const loginSchema = z
   .strict();
 
 export type LoginBody = z.infer<typeof loginSchema>;
+
+/** 013-auth-hardening */
+export const requestPasswordResetSchema = z
+  .object({
+    email: z.string().email(),
+  })
+  .strict();
+
+export type RequestPasswordResetBody = z.infer<typeof requestPasswordResetSchema>;
+
+export const resetPasswordSchema = z
+  .object({
+    token: z.string().min(1),
+    newPassword: z.string().min(1),
+  })
+  .strict();
+
+export type ResetPasswordBody = z.infer<typeof resetPasswordSchema>;

src/modules/identity/auth/service/auth.service.ts

@@ -1,8 +1,23 @@
 import { User } from '@prisma/client';
-import { AuthenticationError } from '@/common/errors';
-import { revokeToken } from '@/infrastructure/cache';
-import { authRepository, AuthRepository } from '../repository';
-import { verifyPassword, signToken, verifyToken } from '../mapper';
+import { AppError, AuthenticationError, RateLimitError } from '@/common/errors';
+import { checkRateLimit, revokeToken } from '@/infrastructure/cache';
+import { logger } from '@/infrastructure/observability';
+import { authConfig } from '@/config';
+import {
+  authRepository,
+  AuthRepository,
+  resetTokenRepository,
+  ResetTokenRepository,
+} from '../repository';
+import {
+  verifyPassword,
+  signToken,
+  verifyToken,
+  hashPassword,
+  generateResetToken,
+  hashResetToken,
+  validatePasswordStrength,
+} from '../mapper';
 import { LoginBody } from '../schema';
 
 export interface LoginResult {
@@ -15,14 +30,29 @@ function toPublicUser(user: User): LoginResult['user'] {
 }
 
 export class AuthService {
-  constructor(private readonly repo: AuthRepository = authRepository) {}
+  constructor(
+    private readonly repo: AuthRepository = authRepository,
+    private readonly resetTokens: ResetTokenRepository = resetTokenRepository,
+  ) {}
 
   /**
    * FR-002/SC-003: every failure branch (no such email, inactive account, wrong password)
    * throws the identical AuthenticationError — bcrypt.compare always runs exactly once,
    * against a fixed dummy hash when no user is found, so timing never leaks which branch fired.
+   * 013-auth-hardening FR-006/FR-007: the rate-limit check runs first, before any credential
+   * work — a rate-limited attempt never reaches (and can't distinguish itself via timing from)
+   * the identical-failure-response path below.
    */
   async login(body: LoginBody): Promise<LoginResult> {
+    const rateLimit = await checkRateLimit(
+      `login:${body.email}`,
+      authConfig.loginRateLimitMaxAttempts,
+      authConfig.loginRateLimitWindowSeconds,
+    );
+    if (!rateLimit.allowed) {
+      throw new RateLimitError('Too many login attempts. Try again later.');
+    }
+
     const user = await this.repo.findByEmail(body.email);
     const passwordMatches = await verifyPassword(body.password, user?.passwordHash ?? null);
 
@@ -46,6 +76,59 @@ export class AuthService {
     const remainingSeconds = Math.max(1, (payload.exp ?? 0) - Math.floor(Date.now() / 1000));
     await revokeToken(payload.jti, remainingSeconds);
   }
+
+  /**
+   * 013-auth-hardening FR-001/SC-001: always resolves the same way regardless of whether the
+   * email corresponds to a real, active account — only issues a real token when it does. The
+   * "delivery" step is a stubbed structured log line (research.md), not a real email.
+   */
+  async requestPasswordReset(email: string): Promise<void> {
+    const user = await this.repo.findByEmail(email);
+    if (user && user.active) {
+      const { token, tokenHash } = generateResetToken();
+      await this.resetTokens.issue(
+        user.id,
+        tokenHash,
+        authConfig.passwordResetTokenLifetimeMinutes * 60,
+      );
+      logger.info(
+        {
+          event: 'password_reset_requested',
+          userId: user.id,
+          resetUrl: `/reset-password?token=${token}`,
+        },
+        'Password reset requested — stubbed delivery (013-auth-hardening research.md): no real ' +
+          'email is sent yet, this log line is the only place the token is visible.',
+      );
+    }
+    // Same outcome either way (FR-001) — no branch here reveals which case fired.
+  }
+
+  /**
+   * 013-auth-hardening FR-004/FR-005: password strength is checked before the token is even
+   * looked up (data-model.md); the token itself is single-use (SC-002) — resolving and
+   * consuming it happen together so a second attempt with the same token always fails.
+   * Edge Cases: a token issued for an account later deactivated is rejected — reactivation is
+   * 010's own admin domain, not something this flow performs incidentally.
+   */
+  async resetPassword(token: string, newPassword: string): Promise<void> {
+    validatePasswordStrength(newPassword);
+
+    const tokenHash = hashResetToken(token);
+    const userId = await this.resetTokens.resolve(tokenHash);
+    if (!userId) {
+      throw new AppError('Invalid or expired reset token.', 'INVALID_RESET_TOKEN', 400);
+    }
+    await this.resetTokens.consume(tokenHash, userId);
+
+    const user = await this.repo.findActiveById(userId);
+    if (!user) {
+      throw new AppError('Invalid or expired reset token.', 'INVALID_RESET_TOKEN', 400);
+    }
+
+    const passwordHash = await hashPassword(newPassword);
+    await this.repo.updatePassword(userId, passwordHash);
+  }
 }
 
 export const authService = new AuthService();

tests/helpers/auth.ts

@@ -1,3 +1,4 @@
+import { randomUUID } from 'crypto';
 import { FastifyInstance } from 'fastify';
 import bcrypt from 'bcryptjs';
 import { prismaClient } from '@/infrastructure/database';
@@ -6,20 +7,23 @@ const TEST_PASSWORD = 'Test-Password-123!';
 
 /**
  * 010-identity-auth made fastify.authenticate real — every test file calling a route already
- * gated by it (across 002-009's own suites) needs a real session now. Rather than depend on
+ * gated by it (across 002-009's own suites) needs a real session now. This creates its own
+ * throwaway admin/agent account directly and logs in as it, so callers don't depend on
  * prisma/seed/roles.seed.ts having already been run against whatever database the suite
- * connects to, this upserts its own throwaway admin/agent account directly (idempotent — safe
- * to call from many test files' own beforeAll against the same database) and logs in as it.
+ * connects to.
+ *
+ * 013-auth-hardening: the email is unique per call (not a fixed `test-admin@...` shared across
+ * every integration test file) because login is now rate-limited per email — dozens of files
+ * each calling this once in their own beforeAll would otherwise share one rate-limit bucket and
+ * trip it well before any file's own tests get to run.
  */
 export async function loginAs(
   app: FastifyInstance,
   role: 'ADMIN' | 'AGENT' = 'ADMIN',
 ): Promise<string> {
-  const email = `test-${role.toLowerCase()}@supporthub.test`;
-  await prismaClient.user.upsert({
-    where: { email },
-    update: {},
-    create: {
+  const email = `test-${role.toLowerCase()}-${randomUUID()}@supporthub.test`;
+  await prismaClient.user.create({
+    data: {
       email,
       name: `Test ${role}`,
       role,

tests/integration/login-rate-limit.test.ts

@@ -0,0 +1,74 @@
+import { describe, it, expect, beforeAll, afterAll } from 'vitest';
+import { buildApp } from '@/app';
+import { prismaClient } from '@/infrastructure/database';
+import { FastifyInstance } from 'fastify';
+import bcrypt from 'bcryptjs';
+import { authConfig } from '@/config';
+
+/**
+ * Covers specs/013-auth-hardening/quickstart.md Scenario 3 against a real Postgres/Redis.
+ */
+describe('Login rate limiting (User Story 3)', () => {
+  let app: FastifyInstance;
+  const suffix = Date.now();
+  const email = `rate-limit-test-${suffix}@supporthub.test`;
+  const otherEmail = `rate-limit-other-${suffix}@supporthub.test`;
+  const correctPassword = 'Correct-Password-1!';
+  let userId: string;
+  let otherUserId: string;
+
+  beforeAll(async () => {
+    app = await buildApp();
+    const user = await prismaClient.user.create({
+      data: {
+        email,
+        name: 'Rate Limit Test User',
+        role: 'AGENT',
+        passwordHash: await bcrypt.hash(correctPassword, 10),
+      },
+    });
+    userId = user.id;
+
+    const otherUser = await prismaClient.user.create({
+      data: {
+        email: otherEmail,
+        name: 'Rate Limit Other User',
+        role: 'AGENT',
+        passwordHash: await bcrypt.hash(correctPassword, 10),
+      },
+    });
+    otherUserId = otherUser.id;
+  });
+
+  afterAll(async () => {
+    await prismaClient.user.deleteMany({ where: { id: { in: [userId, otherUserId] } } });
+    await app.close();
+  });
+
+  it('blocks the same email after its attempt budget is exhausted, without affecting other emails', async () => {
+    for (let i = 0; i < authConfig.loginRateLimitMaxAttempts; i++) {
+      const res = await app.inject({
+        method: 'POST',
+        url: '/auth/login',
+        payload: { email, password: 'definitely-wrong' },
+      });
+      expect(res.statusCode).toBe(401);
+    }
+
+    // One more attempt for the same email, this time with the CORRECT password — still 429.
+    const blockedRes = await app.inject({
+      method: 'POST',
+      url: '/auth/login',
+      payload: { email, password: correctPassword },
+    });
+    expect(blockedRes.statusCode).toBe(429);
+
+    // A different email in the same window is unaffected.
+    const otherRes = await app.inject({
+      method: 'POST',
+      url: '/auth/login',
+      payload: { email: otherEmail, password: correctPassword },
+    });
+    expect(otherRes.statusCode).toBe(200);
+  });
+});

tests/integration/password-reset-flow.test.ts

@@ -0,0 +1,113 @@
+import { describe, it, expect, beforeAll, afterAll, vi } from 'vitest';
+import { buildApp } from '@/app';
+import { prismaClient } from '@/infrastructure/database';
+import { FastifyInstance } from 'fastify';
+import bcrypt from 'bcryptjs';
+import { logger } from '@/infrastructure/observability';
+
+/**
+ * Covers specs/013-auth-hardening/quickstart.md Scenario 1 against a real Postgres/Redis — the
+ * full request -> (read the token from the stub's own log line) -> consume -> login-with-new-
+ * password flow, and the identical-response-regardless-of-existing-account behavior.
+ */
+describe('Password reset flow (User Story 1)', () => {
+  let app: FastifyInstance;
+  const suffix = Date.now();
+  const email = `reset-test-${suffix}@supporthub.test`;
+  const originalPassword = 'Original-Password-1!';
+  const newPassword = 'Brand-New-Password-2!';
+  let userId: string;
+
+  beforeAll(async () => {
+    app = await buildApp();
+    const user = await prismaClient.user.create({
+      data: {
+        email,
+        name: 'Reset Test User',
+        role: 'AGENT',
+        passwordHash: await bcrypt.hash(originalPassword, 10),
+      },
+    });
+    userId = user.id;
+  });
+
+  afterAll(async () => {
+    await prismaClient.user.deleteMany({ where: { id: userId } });
+    await app.close();
+  });
+
+  function extractLoggedToken(): string {
+    const infoSpy = vi.mocked(logger.info);
+    const call = infoSpy.mock.calls.find(
+      ([data]) => (data as { event?: string }).event === 'password_reset_requested',
+    );
+    if (!call) throw new Error('Expected a password_reset_requested log line, but none was found.');
+
+    const resetUrl = (call[0] as unknown as { resetUrl: string }).resetUrl;
+    const token = new URL(resetUrl, 'http://localhost').searchParams.get('token');
+    if (!token) throw new Error('Expected the logged resetUrl to carry a token query param.');
+    return token;
+  }
+
+  it('Scenario 1: request -> stub-logged token -> consume -> login with the new password', async () => {
+    const infoSpy = vi.spyOn(logger, 'info');
+
+    const requestRes = await app.inject({
+      method: 'POST',
+      url: '/auth/password-reset/request',
+      payload: { email },
+    });
+    expect(requestRes.statusCode).toBe(200);
+    expect(requestRes.json().data.message).not.toMatch(/token|[a-f0-9]{64}/i);
+
+    const nonexistentRes = await app.inject({
+      method: 'POST',
+      url: '/auth/password-reset/request',
+      payload: { email: `nobody-${suffix}@supporthub.test` },
+    });
+    expect(nonexistentRes.statusCode).toBe(200);
+    expect(nonexistentRes.json()).toEqual(requestRes.json());
+
+    const token = extractLoggedToken();
+
+    const consumeRes = await app.inject({
+      method: 'POST',
+      url: '/auth/password-reset/consume',
+      payload: { token, newPassword },
+    });
+    expect(consumeRes.statusCode).toBe(200);
+
+    // Single-use — the same token fails a second time.
+    const secondConsumeRes = await app.inject({
+      method: 'POST',
+      url: '/auth/password-reset/consume',
+      payload: { token, newPassword: 'Another-Password-3!' },
+    });
+    expect(secondConsumeRes.statusCode).toBe(400);
+
+    const loginWithNew = await app.inject({
+      method: 'POST',
+      url: '/auth/login',
+      payload: { email, password: newPassword },
+    });
+    expect(loginWithNew.statusCode).toBe(200);
+
+    const loginWithOld = await app.inject({
+      method: 'POST',
+      url: '/auth/login',
+      payload: { email, password: originalPassword },
+    });
+    expect(loginWithOld.statusCode).toBe(401);
+
+    infoSpy.mockRestore();
+  });
+
+  it('rejects an invalid token outright', async () => {
+    const res = await app.inject({
+      method: 'POST',
+      url: '/auth/password-reset/consume',
+      payload: { token: 'not-a-real-token', newPassword: 'Whatever-Password-1!' },
+    });
+    expect(res.statusCode).toBe(400);
+  });
+});

tests/unit/identity/login-failure-parity.test.ts

@@ -1,6 +1,7 @@
-import { describe, it, expect, vi } from 'vitest';
+import { describe, it, expect, vi, beforeEach } from 'vitest';
 import bcrypt from 'bcryptjs';
 import { AuthService } from '@/modules/identity/auth/service/auth.service';
+import * as cache from '@/infrastructure/cache';
 
 const REAL_PASSWORD_HASH = bcrypt.hashSync('the-real-password', 10);
 
@@ -19,6 +20,10 @@ function fakeUser(overrides: Partial<Record<string, unknown>> = {}) {
 }
 
 describe('AuthService.login failure parity', () => {
+  beforeEach(() => {
+    vi.spyOn(cache, 'checkRateLimit').mockResolvedValue({ allowed: true, count: 1 });
+  });
+
   it('throws the identical error for a nonexistent email and a wrong password', async () => {
     const repoFoundUser = { findByEmail: vi.fn().mockResolvedValue(fakeUser()) } as never;
     const repoNoUser = { findByEmail: vi.fn().mockResolvedValue(null) } as never;

tests/unit/identity/login-rate-limit-ordering.test.ts

@@ -0,0 +1,37 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { AuthService } from '@/modules/identity/auth/service/auth.service';
+import * as cache from '@/infrastructure/cache';
+
+describe('AuthService.login rate-limit ordering (User Story 3)', () => {
+  beforeEach(() => {
+    vi.restoreAllMocks();
+  });
+
+  it('checks the rate limit before ever looking up the account', async () => {
+    const findByEmail = vi.fn().mockResolvedValue(null);
+    const repo = { findByEmail } as never;
+    const service = new AuthService(repo);
+
+    vi.spyOn(cache, 'checkRateLimit').mockResolvedValue({ allowed: false, count: 6 });
+
+    await expect(
+      service.login({ email: 'agent@example.com', password: 'anything' }),
+    ).rejects.toMatchObject({ statusCode: 429 });
+
+    expect(findByEmail).not.toHaveBeenCalled();
+  });
+
+  it('proceeds to credential checks once the rate limit allows the attempt', async () => {
+    const findByEmail = vi.fn().mockResolvedValue(null);
+    const repo = { findByEmail } as never;
+    const service = new AuthService(repo);
+
+    vi.spyOn(cache, 'checkRateLimit').mockResolvedValue({ allowed: true, count: 1 });
+
+    await expect(
+      service.login({ email: 'agent@example.com', password: 'anything' }),
+    ).rejects.toMatchObject({ statusCode: 401 });
+
+    expect(findByEmail).toHaveBeenCalledWith('agent@example.com');
+  });
+});

tests/unit/identity/password-policy.test.ts

@@ -0,0 +1,17 @@
+import { describe, it, expect } from 'vitest';
+import { validatePasswordStrength } from '@/modules/identity/auth/mapper/password-policy';
+import { authConfig } from '@/config';
+
+describe('validatePasswordStrength', () => {
+  it('rejects a password shorter than the configured minimum, naming the actual requirement', () => {
+    const tooShort = 'a'.repeat(authConfig.passwordMinLength - 1);
+    expect(() => validatePasswordStrength(tooShort)).toThrowError(
+      `Password must be at least ${authConfig.passwordMinLength} characters.`,
+    );
+  });
+
+  it('accepts a password meeting the configured minimum', () => {
+    const meetsPolicy = 'a'.repeat(authConfig.passwordMinLength);
+    expect(() => validatePasswordStrength(meetsPolicy)).not.toThrow();
+  });
+});