feat(api): password login, sliding renewal, revocable sessions
- POST /v1/auth/password|refresh|logout per contract operationIds; long-lived single token (32B hex, DB stores sha256 only), sliding renewal without rotation, logout sets sessions.revokedAt. - SessionGuard: Bearer -> session -> user eligibility (disabled/locked/ pending revoke access); all failures map to 401 AUTH_TOKEN_EXPIRED. - Anti-enumeration: unknown account / wrong password / status-blocked share one 401 AUTH_INVALID_CREDENTIALS; unknown-account path runs a dummy argon2 verify to equalize timing. - Login rate limiting (P1): in-memory account+IP sliding window, 5 failures / 15 min -> 429; success clears. Contract amendment (registered): new ErrorCodes.AUTH_RATE_LIMITED added to errors.ts + openapi Error enum + 429 response on /auth/password; generated types regenerated and committed. P1a single-instance limiter; P5 needs a Redis-backed implementation. - Global ValidationPipe (APP_PIPE) enforces class-validator DTOs -> 400 VALIDATION_FAILED via the existing exception filter. Co-Authored-By: Claude Code <noreply@anthropic.com>
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// services/api/src/auth/auth.service.ts —— 登录 / 滑动续期 / 注销核心逻辑(Task 13)。
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// 会话模型:长效单令牌 + 滑动续期(用户决策 2026-09-17,不做 access/refresh 双层)。
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// 令牌 = 32B randomBytes hex(仅登录响应出现一次);库内只存 sha256(token)。
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// 安全要点:
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// · 防账号枚举——账号不存在 / 密码错误 / 状态不合格(停用、锁定、待激活)三者
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// 返回同一 401 AUTH_INVALID_CREDENTIALS 且同文案;账号不存在时也跑一次等代价
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// argon2 verify(dummy hash)拉平时延,杜绝「响应快慢」侧信道。
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// · 登录失败限速(总纲 P1)——account+IP 维度、15 分钟窗口、5 次失败锁定,
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// 成功登录清零。进程内存实现:P1a 单实例足够;P5 多实例需换 Redis 后端限速器
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// (本类私有接口不变,替换实现即可)。
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// · 审计——登录成功写 audit_logs(action='auth.login', actor=用户);
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// 注销不写审计(会话行 revokedAt 本身即持久的注销凭据)。
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import { randomBytes } from 'node:crypto';
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import { HttpStatus, Injectable } from '@nestjs/common';
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import { ErrorCodes } from '@photo/contracts';
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import { ApiException } from '../api-exception';
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import { PrismaService } from '../prisma/prisma.service';
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import { hashPassword, verifyPassword } from './password';
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import { hashSessionToken } from './session.guard';
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/** 契约默认 30 天(.env AUTH_SESSION_TTL_SECONDS 同名可调)。 */
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const DEFAULT_SESSION_TTL_SECONDS = 2_592_000;
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const LOGIN_RATE_LIMIT_MAX_FAILURES = 5;
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const LOGIN_RATE_LIMIT_WINDOW_MS = 15 * 60 * 1000;
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function invalidCredentials(): ApiException {
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return new ApiException(
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ErrorCodes.AUTH_INVALID_CREDENTIALS,
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'Invalid account or password',
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HttpStatus.UNAUTHORIZED,
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);
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}
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// 惰性生成一次 dummy argon2 哈希并复用:账号不存在路径用它跑等代价 verify。
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// 选「首用时生成」而非内嵌常量:参数始终跟随 hashPassword 当前默认,不会因
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// 升级 argon2 参数而漂移成不等价时延。
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let dummyHashPromise: Promise<string> | undefined;
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function dummyHash(): Promise<string> {
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dummyHashPromise ??= hashPassword(randomBytes(32).toString('hex'));
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return dummyHashPromise;
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}
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/** 进程内滑动窗口失败计数器(account+IP 维度)。 */
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class InMemoryLoginRateLimiter {
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private readonly buckets = new Map<string, { count: number; windowStart: number }>();
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constructor(
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private readonly maxFailures: number,
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private readonly windowMs: number,
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) {}
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/** 窗口期内失败次数达到阈值即锁定;窗口过期顺手淘汰条目,Map 不无界增长。 */
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isLocked(key: string): boolean {
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const bucket = this.buckets.get(key);
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if (bucket === undefined) {
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return false;
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}
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if (Date.now() - bucket.windowStart >= this.windowMs) {
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this.buckets.delete(key);
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return false;
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}
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return bucket.count >= this.maxFailures;
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}
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recordFailure(key: string): void {
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const now = Date.now();
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const bucket = this.buckets.get(key);
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if (bucket === undefined || now - bucket.windowStart >= this.windowMs) {
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this.buckets.set(key, { count: 1, windowStart: now });
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return;
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}
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bucket.count += 1;
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}
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clear(key: string): void {
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this.buckets.delete(key);
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}
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}
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export interface LoginResult {
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sessionToken: string;
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expiresAt: string;
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}
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export interface RenewalResult {
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expiresAt: string;
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}
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@Injectable()
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export class AuthService {
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private readonly sessionTtlSeconds: number;
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private readonly rateLimiter = new InMemoryLoginRateLimiter(
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LOGIN_RATE_LIMIT_MAX_FAILURES,
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LOGIN_RATE_LIMIT_WINDOW_MS,
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);
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constructor(private readonly prisma: PrismaService) {
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const raw = Number.parseInt(
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process.env.AUTH_SESSION_TTL_SECONDS ?? '',
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10,
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);
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this.sessionTtlSeconds =
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Number.isFinite(raw) && raw > 0 ? raw : DEFAULT_SESSION_TTL_SECONDS;
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}
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async login(
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account: string,
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plainPassword: string,
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ip: string,
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): Promise<LoginResult> {
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// ① 限速先行:锁定期内不触 DB、不跑 argon2(即便密码正确也 429,
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// 防止用「锁定与否」探测密码正确性)。
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const rateKey = `${account}|${ip}`;
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if (this.rateLimiter.isLocked(rateKey)) {
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throw new ApiException(
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ErrorCodes.AUTH_RATE_LIMITED,
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'Too many failed login attempts; try again later',
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HttpStatus.TOO_MANY_REQUESTS,
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);
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}
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// ② 查用户:不存在 → dummy verify 拉平时延后与密码错误同响应。
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const user = await this.prisma.users.findUnique({ where: { account } });
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if (user === null) {
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await verifyPassword(await dummyHash(), plainPassword);
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this.rateLimiter.recordFailure(rateKey);
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throw invalidCredentials();
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}
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// ③ 先验密码再查状态:状态不合格与密码错误同样不可区分(同 401 同文案;
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// argon2 在两条路径都真实跑过,时延也一致)。
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if (!(await verifyPassword(user.passwordHash, plainPassword))) {
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this.rateLimiter.recordFailure(rateKey);
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throw invalidCredentials();
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}
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if (
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user.sourceStatus === 'disabled' ||
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user.localLocked ||
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user.credentialStatus !== 'active'
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) {
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// 密码已证实正确——不属于凭据猜测,不计入限速(限速针对撞库,
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// 停用/待激活账号本就无法登录,计数无防护收益)。
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throw invalidCredentials();
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}
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// ④ 签发会话:明文令牌仅本次返回;库存 sha256,expiresAt=now+TTL。
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const sessionToken = randomBytes(32).toString('hex');
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const session = await this.prisma.sessions.create({
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data: {
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userId: user.id,
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tokenHash: hashSessionToken(sessionToken),
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expiresAt: new Date(Date.now() + this.sessionTtlSeconds * 1000),
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},
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});
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this.rateLimiter.clear(rateKey);
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// ⑤ 审计(resourceId=会话 id:登录动作产出的资源即会话)。
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await this.prisma.audit_logs.create({
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data: {
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actorId: user.id,
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action: 'auth.login',
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resourceId: session.id,
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metadata: { ip },
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},
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});
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return {
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sessionToken,
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expiresAt: session.expiresAt.toISOString(),
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};
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}
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/**
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* 滑动续期:同一令牌不轮换(会话行只前移 expiresAt)。
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* 守卫已校验有效性;此处仍防御性复核(守卫与更新之间存在微小窗口,
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* 且未来其它调用方可能绕过守卫)。
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*/
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async refresh(sessionId: string): Promise<RenewalResult> {
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const session = await this.prisma.sessions.findUnique({
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where: { id: sessionId },
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});
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if (
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session === null ||
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session.revokedAt !== null ||
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session.expiresAt.getTime() <= Date.now()
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) {
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throw new ApiException(
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ErrorCodes.AUTH_TOKEN_EXPIRED,
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'Session token is missing, invalid, or expired',
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HttpStatus.UNAUTHORIZED,
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);
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}
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const expiresAt = new Date(Date.now() + this.sessionTtlSeconds * 1000);
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await this.prisma.sessions.update({
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where: { id: sessionId },
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data: { expiresAt },
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});
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return { expiresAt: expiresAt.toISOString() };
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}
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/** 注销:置 revokedAt;幂等(updateMany 只在尚未撤销时落时间戳)。 */
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async logout(sessionId: string): Promise<void> {
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await this.prisma.sessions.updateMany({
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where: { id: sessionId, revokedAt: null },
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data: { revokedAt: new Date() },
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});
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}
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}
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