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feat(auth): authentication module with multi-tenant isolation (RFC-001)
Introduce an always-on auth layer with auto-created admin on first boot, multi-tenant isolation for threads/stores, and a full setup/login flow. Backend - JWT access tokens with `ver` field for stale-token rejection; bump on password/email change - Password hashing, HttpOnly+Secure cookies (Secure derived from request scheme at runtime) - CSRF middleware covering both REST and LangGraph routes - IP-based login rate limiting (5 attempts / 5-min lockout) with bounded dict growth and X-Forwarded-For bypass fix - Multi-worker-safe admin auto-creation (single DB write, WAL once) - needs_setup + token_version on User model; SQLite schema migration - Thread/store isolation by owner; orphan thread migration on first admin registration - thread_id validated as UUID to prevent log injection - CLI tool to reset admin password - Decorator-based authz module extracted from auth core Frontend - Login and setup pages with SSR guard for needs_setup flow - Account settings page (change password / email) - AuthProvider + route guards; skips redirect when no users registered - i18n (en-US / zh-CN) for auth surfaces - Typed auth API client; parseAuthError unwraps FastAPI detail envelope Infra & tooling - Unified `serve.sh` with gateway mode + auto dep install - Public PyPI uv.toml pin for CI compatibility - Regenerated uv.lock with public index Tests - HTTP vs HTTPS cookie security tests - Auth middleware, rate limiter, CSRF, setup flow coverage
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# Auth Module Design Spec
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**Date:** 2026-04-04
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**Status:** Approved
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**PR:** #1728
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## Overview
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DeerFlow 内置认证模块，始终强制，零配置启动。首次启动自动创建 admin，用户通过控制台日志获取初始密码，首次登录时设置真实邮箱和新密码。
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## Design Decisions
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| 决策 | 选择 | 拒绝的替代方案 | 理由 |
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|------|------|---------------|------|
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| Auth 模式 | 始终强制 | 渐进式 / 可关闭 | 无竞争窗口，无条件分支 |
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| Admin 创建 | 启动时自动创建 + 随机密码 | Setup 页面自注册 / 环境变量注入 | 零配置 + 无竞争 |
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| 密码发现 | 控制台日志 | 密码文件 | 无文件权限/删除/gitignore 问题 |
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| 首次登录 | 强制 setup（改邮箱 + 改密码） | 可选修改 | 避免 admin@localhost 成为永久账号 |
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| Setup 接口 | 扩展 change-password | 新增 /setup 端点 | YAGNI，功能完全覆盖 |
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| needs_setup 存储 | DB 字段 | JWT payload / 文件 | Single source of truth |
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| Auth 保护范围 | 全局 middleware + allowlist | 逐路由装饰器 | 漏加装饰器 = 漏洞 |
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| 注册 | 开放（user 角色） | 默认关闭 / 邀请制 | 团队工具，低滥用风险 |
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| Token 失效 | password_version 字段 | blocklist / secret rotation | 最简实现 |
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## Data Model
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### User 表变更
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新增两个字段：
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```sql
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needs_setup BOOLEAN NOT NULL DEFAULT FALSE
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token_version INTEGER NOT NULL DEFAULT 0
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```
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- `needs_setup`: 自动创建的 admin 为 True，完成 setup 后 False
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- `token_version`: 每次改密码 +1，JWT 校验时比对
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已有数据库升级：`ALTER TABLE users ADD COLUMN ... DEFAULT ...`，用 try/except 兼容。
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### JWT Payload
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```json
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{
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"sub": "user_id",
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"ver": 0,
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"exp": "...",
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"iat": "..."
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}
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```
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`ver` 对应 `User.token_version`，decode 时查 DB 比对，不匹配则 401。
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## Startup Flow
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```
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Gateway lifespan 启动
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↓
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count_users() == 0?
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├─ YES → 创建 admin@deerflow.dev (needs_setup=True, 随机密码)
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│ → 迁移无 user_id 的 thread 到 admin
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│ → 控制台输出邮箱 + 密码
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├─ NO, 有 needs_setup=True 的用户 → 日志提醒完成设置或用 reset_admin
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└─ NO, 无 needs_setup → 正常启动
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```
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### 多进程安全
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- SQLite UNIQUE 约束处理竞争
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- 第二个实例 INSERT 失败 → 捕获 ValueError → 静默跳过
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### SQLite WAL 模式
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`_init_users_table()` 中执行 `PRAGMA journal_mode=WAL`（首次建表时设置，DB 级持久生效）。允许并发读 + 单写不阻塞读。
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## Auth Enforcement
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### 双层 Auth 架构
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**第一层：全局 AuthMiddleware**（`gateway/auth_middleware.py`，fail-closed safety net）
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```python
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class AuthMiddleware(BaseHTTPMiddleware):
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async def dispatch(self, request, call_next):
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if _is_public(request.url.path):
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return await call_next(request)
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if not request.cookies.get("access_token"):
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return JSONResponse(401, ...)
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return await call_next(request)
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```
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仅检查 cookie 是否存在，不验证签名。新 endpoint 即使忘加装饰器也不会裸奔。
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**Public path 规则：**
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- 前缀匹配：`/health`, `/docs`, `/redoc`, `/openapi.json`, `/api/v1/auth/`
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- 其他所有路径默认需要 cookie
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**第二层：`@require_auth` + `@require_permission` 装饰器**（`gateway/authz.py`，细粒度控制）
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验证 JWT 签名、用户存在性、token_version、resource:action 权限、owner_check。
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两层职责不同、互不替代。
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### CSRF
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始终校验，无条件。Auth endpoint（login/register/logout）豁免。
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## Login Flow
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```
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POST /api/v1/auth/login/local
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↓
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验证密码 → 成功
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↓
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检查 user.needs_setup
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├─ True → 返回 {expires_in, needs_setup: true}
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└─ False → 返回 {expires_in}
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```
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前端根据 `needs_setup` 决定跳转 `/setup` 还是 `/workspace`。
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## Setup Flow
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```
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/setup 页面（前端新增）
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↓
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表单：邮箱 + 新密码 + 确认密码
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↓
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POST /api/v1/auth/change-password
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body: {current_password, new_password, new_email}
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↓
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后端：更新邮箱 + 密码 + token_version++ + needs_setup=False
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↓
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前端：跳转 /workspace
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```
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### SSR Guard
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`getServerSideUser()` 返回的 `AuthResult` 增加 tag：
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```typescript
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| { tag: "needs_setup"; user: User }
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```
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`workspace/layout.tsx`: `case "needs_setup": redirect("/setup")`
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### change-password 接口扩展
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新增可选字段 `new_email: EmailStr | None`。有值时同时更新邮箱（校验唯一性）。
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如果 `user.needs_setup == True` 且提供了 `new_email`，成功后自动设 `needs_setup = False`。
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## Token Invalidation
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改密码时 `token_version += 1`。JWT encode 时写入 `ver`。
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校验链路：`decode_token` → `TokenPayload` 包含 `ver` → `get_current_user_from_request` 查 DB → 比对 `user.token_version != payload.ver` → 401。
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触发场景：
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- 用户改密码
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- admin 用 reset_admin CLI
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- setup 流程完成
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## Rate Limiting
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登录端点 IP 级限速，内存计数器：
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```python
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_login_attempts: dict[str, tuple[int, float]] = {} # ip → (fail_count, lock_until)
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```
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- 同一 IP 连续 5 次失败 → 锁定 5 分钟
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- 成功登录 → 重置计数
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- 不引入 Redis，进程内 dict 够用
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## Thread Migration
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在 `_ensure_admin_user` 中，创建 admin 后同步执行：
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- 扫描 Store 中所有 thread
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- `metadata.user_id` 为空 → 写入 admin 的 user_id
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- 日志记录迁移数量
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在 lifespan 中同步执行（此时未接受请求），不存在并发问题。
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## Password Recovery
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```bash
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python -m app.gateway.auth.reset_admin [--email user@example.com]
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```
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行为：
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- 生成随机密码
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- 更新密码 hash
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- `token_version += 1`（旧 token 立即失效）
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- `needs_setup = True`（下次登录走 setup 流程）
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- 打印新密码到 stdout
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## File Changes Summary
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### Backend
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| 文件 | 变更 |
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|------|------|
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| `auth/models.py` | User 加 `needs_setup`, `token_version` |
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| `auth/jwt.py` | encode 加 `ver`，TokenPayload 加 `ver` |
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| `auth/repositories/sqlite.py` | DDL 加列 + ALTER TABLE 兼容 + WAL 模式 |
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| `gateway/app.py` | `_ensure_admin_user` + thread 迁移 + AuthMiddleware |
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| `gateway/auth_middleware.py` | 全局 auth middleware（cookie 存在性检查，fail-closed safety net） |
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| `gateway/deps.py` | decode 后校验 `token_version` |
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| `gateway/routers/auth.py` | login 返回 `needs_setup`，change-password 扩展 `new_email` + `needs_setup` + `token_version` |
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| `gateway/routers/auth.py` | 登录限速 |
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| `auth/reset_admin.py` | 设 `needs_setup=True` + `token_version++` |
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### Frontend
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| 文件 | 变更 |
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|------|------|
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| `core/auth/types.ts` | AuthResult 加 `needs_setup` tag |
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| `core/auth/server.ts` | SSR guard 返回 `needs_setup` |
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| `app/workspace/layout.tsx` | `needs_setup` → redirect `/setup` |
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| `app/(auth)/setup/page.tsx` | 新页面：邮箱 + 新密码表单 |
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## Deferred (Future Work)
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- OAuth 登录（GitHub, Google）
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- 邮件验证 / 找回密码
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- RBAC 细粒度权限
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- CSRF token 定期轮换
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- PostgreSQL 用户存储
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