feat: trigger LDAP background sync on successful login

.env.example

@@ -4,6 +4,8 @@ DATABASE_URL=sqlite:///./app.db
 SECRET_KEY=changeme-replace-in-production
 ADMIN_USERNAME=admin
 ADMIN_PASSWORD=change_me
+LDAP_SYNC_MIN_INTERVAL_HOURS=12
+LDAP_SYNC_LETTER_DELAY_SECONDS=5.0
 
 # Produktion (MariaDB + LDAP):
 # APP_ENV=production

app/core/config.py

@@ -14,6 +14,8 @@ class Settings(BaseSettings):
     LDAP_SERVER: str = "gso1.ads1.fh-nuernberg.de"
     LDAP_DOMAIN: str = "ADS1"
     LDAP_SEARCH_BASE: str = "OU=users,OU=EFI,OU=Faculties,DC=ADS1,DC=fh-nuernberg,DC=de"
+    LDAP_SYNC_MIN_INTERVAL_HOURS: int = 12
+    LDAP_SYNC_LETTER_DELAY_SECONDS: float = 5.0
     ADMIN_USERNAME: str = "admin"
     ADMIN_PASSWORD: str = "change_me"
 

app/main.py

@@ -1,3 +1,5 @@
+import importlib
+import logging
 from contextlib import asynccontextmanager
 
 from fastapi import Depends, FastAPI, Request, WebSocket
@@ -6,16 +8,70 @@ from fastapi.staticfiles import StaticFiles
 from fastapi.templating import Jinja2Templates
 
 from app.core.config import get_settings
-from app.core.database import get_db
+from app.modules.auth.dependencies import (
-from app.modules.auth.dependencies import RequiresLoginException, get_current_user
+    RequiresLoginException,
+    check_permission,
+    get_current_user_optional,
+)
 from app.modules.auth.router import router as auth_router
 
+logger = logging.getLogger(__name__)
 settings = get_settings()
 
+MODULES = [
+    {
+        "slug": "rss",
+        "icon": "📡",
+        "name": "RSS-Feed Server",
+        "description": "Aggregiert und verteilt Neuigkeiten der Fakultät als standardkonformen RSS 2.0 Feed.",
+        "status": "active",
+        "permission": ["authenticated"],
+    },
+    {
+        "slug": "kalender",
+        "icon": "📅",
+        "name": "Kalender",
+        "description": "Veranstaltungen, Prüfungstermine und Fristen im iCal-Format.",
+        "status": "planned",
+        "permission": ["authenticated"],
+    },
+    {
+        "slug": "benachrichtigungen",
+        "icon": "🔔",
+        "name": "Benachrichtigungen",
+        "description": "Push-Nachrichten und WebSocket-basierte Echtzeit-Alerts für Studierende.",
+        "status": "planned",
+        "permission": ["authenticated"],
+    },
+    {
+        "slug": "auslastung",
+        "icon": "📊",
+        "name": "Auslastung",
+        "description": "Raum- und Ressourcenauslastung der Fakultät in Echtzeit.",
+        "status": "planned",
+        "permission": ["authenticated"],
+    },
+    {
+        "slug": "lehrveranstaltungen",
+        "icon": "📚",
+        "name": "Lehrveranstaltungen",
+        "description": "Stundenplan-API und Kursinformationen aus dem Campus-System.",
+        "status": "planned",
+        "permission": ["authenticated"],
+    },
+]
+
+NAV_ITEMS = [
+    {"label": "Übersicht", "url": "/", "active": True},
+    {"label": "RSS-Feeds", "url": "/rss", "active": False},
+    {"label": "Kalender", "url": "/kalender", "active": False},
+    {"label": "Docs", "url": "/docs", "active": False},
+]
+
 
 def _reset_admin() -> None:
     from app.core.database import Base, SessionLocal, engine
-    from app.modules.auth.models import User  # noqa: F401 — registers table
+    from app.modules.auth.models import User  # noqa: F401
     from app.modules.auth.service import get_user, hash_password
 
     Base.metadata.create_all(bind=engine)
@@ -31,7 +87,7 @@ def _reset_admin() -> None:
 
 
 @asynccontextmanager
-async def lifespan(app: FastAPI):
+async def lifespan(_app: FastAPI):
     _reset_admin()
     yield
 
@@ -47,66 +103,34 @@ templates = Jinja2Templates(directory="app/templates")
 
 app.include_router(auth_router)
 
+for _module in MODULES:
+    if _module["status"] == "active":
+        try:
+            _mod = importlib.import_module(f"app.modules.{_module['slug']}.router")
+            app.include_router(_mod.router, prefix=f"/{_module['slug']}")
+        except ModuleNotFoundError:
+            logger.warning("Module router not found: app.modules.%s.router", _module["slug"])
+
 
 @app.exception_handler(RequiresLoginException)
-async def requires_login_handler(request: Request, exc: RequiresLoginException):
+async def requires_login_handler(_request: Request, _exc: RequiresLoginException):
     return RedirectResponse(url="/auth/login", status_code=307)
 
 
-MODULES = [
-    {
-        "icon": "📡",
-        "name": "RSS-Feed Server",
-        "description": "Aggregiert und verteilt Neuigkeiten der Fakultät als standardkonformen RSS 2.0 Feed.",
-        "status": "active",
-    },
-    {
-        "icon": "📅",
-        "name": "Kalender",
-        "description": "Veranstaltungen, Prüfungstermine und Fristen im iCal-Format.",
-        "status": "planned",
-    },
-    {
-        "icon": "🔔",
-        "name": "Benachrichtigungen",
-        "description": "Push-Nachrichten und WebSocket-basierte Echtzeit-Alerts für Studierende.",
-        "status": "planned",
-    },
-    {
-        "icon": "📊",
-        "name": "Auslastung",
-        "description": "Raum- und Ressourcenauslastung der Fakultät in Echtzeit.",
-        "status": "planned",
-    },
-    {
-        "icon": "📚",
-        "name": "Lehrveranstaltungen",
-        "description": "Stundenplan-API und Kursinformationen aus dem Campus-System.",
-        "status": "planned",
-    },
-]
-
-NAV_ITEMS = [
-    {"label": "Übersicht", "url": "/", "active": True},
-    {"label": "RSS-Feeds", "url": "/rss", "active": False},
-    {"label": "Kalender", "url": "/kalender", "active": False},
-    {"label": "Docs", "url": "/docs", "active": False},
-]
-
-
 def _db_mode() -> str:
     url = settings.DATABASE_URL
     return "SQLite (dev)" if url.startswith("sqlite") else "MariaDB (prod)"
 
 
 @app.get("/", response_class=HTMLResponse)
-async def root(request: Request, current_user=Depends(get_current_user)):
+async def root(request: Request, current_user=Depends(get_current_user_optional)):
+    visible = [m for m in MODULES if check_permission(current_user, m["permission"])]
     return templates.TemplateResponse(
         request,
         "index.html",
         {
             "nav_items": NAV_ITEMS,
-            "modules": MODULES,
+            "modules": visible,
             "db_mode": _db_mode(),
             "app_version": "0.1.0",
             "current_user": current_user,

app/modules/auth/ldap.py

@@ -0,0 +1,181 @@
+import logging
+import time
+from datetime import datetime, timedelta, timezone
+from typing import Optional
+
+from ldap3 import ALL, ALL_ATTRIBUTES, NTLM, Connection, Server
+from ldap3.core.exceptions import LDAPSocketOpenError
+from sqlalchemy.orm import Session
+
+from app.modules.auth.models import User
+
+logger = logging.getLogger(__name__)
+
+
+def ldap_authenticate(
+    username: str,
+    password: str,
+    ldap_server: str,
+    ldap_domain: str,
+) -> Optional[dict]:
+    """NTLM bind + fetch user attributes. Returns attrs dict on success, None on failure."""
+    server = Server(ldap_server, get_info=ALL, connect_timeout=8)
+    conn = Connection(
+        server,
+        user=f"{ldap_domain}\\{username}",
+        password=password,
+        authentication=NTLM,
+    )
+    try:
+        conn.bind()
+    except LDAPSocketOpenError:
+        logger.warning("LDAP server %s not reachable", ldap_server)
+        return None
+    except Exception:
+        logger.warning("LDAP bind failed for user %s", username, exc_info=True)
+        return None
+
+    if not conn.extend.standard.who_am_i():
+        conn.unbind()
+        return None
+
+    conn.search(
+        search_base=f"DC={ldap_domain},DC=fh-nuernberg,DC=de",
+        search_filter=f"(&(objectclass=user)(CN={username}))",
+        attributes=ALL_ATTRIBUTES,
+    )
+
+    if not conn.entries:
+        conn.unbind()
+        logger.warning("LDAP: user %s authenticated but no entry found", username)
+        return None
+
+    attrs = _parse_entry(conn.entries[0])
+    conn.unbind()
+    return attrs
+
+
+def _parse_entry(entry) -> dict:
+    def val(field: str, default: str = "N.N.") -> str:
+        try:
+            v = entry[field].value
+            return str(v)[:64] if v else default
+        except Exception:
+            return default
+
+    def expire_date(field: str) -> Optional[datetime]:
+        try:
+            v = entry[field].value
+            if v is None:
+                return None
+            if isinstance(v, datetime):
+                dt = v
+            else:
+                dt = datetime(v.year, v.month, v.day, tzinfo=timezone.utc)
+            if dt.tzinfo is None:
+                dt = dt.replace(tzinfo=timezone.utc)
+            return None if dt.year >= 2099 else dt
+        except Exception:
+            return None
+
+    return {
+        "username": val("sAMAccountName"),
+        "full_name": (f"{val('givenName', '')} {val('sn', '')}".strip() or "N.N."),
+        "department": val("department"),
+        "role": val("description"),
+        "account_expires": expire_date("accountExpires"),
+    }
+
+
+def _has_to_update(db: Session, min_interval_hours: int) -> bool:
+    """True if a background sync is due."""
+    deadline = datetime.now(timezone.utc) - timedelta(hours=min_interval_hours)
+    latest = (
+        db.query(User)
+        .filter(User.pw_hash.is_(None))
+        .order_by(User.updated_at.desc())
+        .first()
+    )
+    if latest is None:
+        return True
+    last = latest.updated_at
+    if last.tzinfo is None:
+        last = last.replace(tzinfo=timezone.utc)
+    return last < deadline
+
+
+def _upsert_from_attrs(db: Session, attrs: dict) -> None:
+    """Create or update a User from AD attribute dict (no commit)."""
+    user = db.query(User).filter(User.username == attrs["username"]).first()
+    if user is None:
+        user = User(username=attrs["username"])
+        db.add(user)
+    user.full_name = attrs["full_name"]
+    user.department = attrs["department"]
+    user.role = attrs["role"]
+    user.account_expires = attrs["account_expires"]
+
+
+def sync_all_users(
+    username: str,
+    password: str,
+    ldap_server: str,
+    ldap_domain: str,
+    ldap_search_base: str,
+    min_interval_hours: int,
+    letter_delay_seconds: float,
+) -> None:
+    """Login-triggered background sync of all AD users. Creates its own DB session."""
+    from app.core.database import SessionLocal
+
+    with SessionLocal() as db:
+        if not _has_to_update(db, min_interval_hours):
+            logger.info("LDAP sync skipped: last sync is recent")
+            return
+
+        server = Server(ldap_server, get_info=ALL, connect_timeout=8)
+        conn = Connection(
+            server,
+            user=f"{ldap_domain}\\{username}",
+            password=password,
+            authentication=NTLM,
+        )
+        try:
+            conn.bind()
+        except Exception:
+            logger.warning("LDAP sync: bind failed", exc_info=True)
+            return
+
+        found_usernames: set[str] = set()
+        chars = "abcdefghijklmnopqrstuvwxyz_"
+
+        for char in chars:
+            try:
+                conn.search(
+                    search_base=ldap_search_base,
+                    search_filter=f"(&(objectclass=user)(CN={char}*))",
+                    attributes=ALL_ATTRIBUTES,
+                )
+                for entry in conn.entries:
+                    try:
+                        attrs = _parse_entry(entry)
+                        found_usernames.add(attrs["username"])
+                        _upsert_from_attrs(db, attrs)
+                    except Exception:
+                        logger.warning("LDAP sync: failed to parse entry", exc_info=True)
+                db.commit()
+            except Exception:
+                logger.warning("LDAP sync: search failed for prefix '%s'", char, exc_info=True)
+
+            if letter_delay_seconds > 0:
+                time.sleep(letter_delay_seconds)
+
+        # Deactivate LDAP users no longer in AD
+        ldap_users = db.query(User).filter(User.pw_hash.is_(None)).all()
+        for user_obj in ldap_users:
+            if user_obj.username not in found_usernames:
+                logger.info("LDAP sync: deactivating %s (not in AD)", user_obj.username)
+                user_obj.is_active = False
+        db.commit()
+        conn.unbind()
+        logger.info("LDAP sync complete — %d users found", len(found_usernames))

app/modules/auth/router.py

@@ -1,4 +1,4 @@
-from fastapi import APIRouter, Depends, Form, Request
+from fastapi import APIRouter, BackgroundTasks, Depends, Form, Request
 from fastapi.responses import HTMLResponse, RedirectResponse
 from fastapi.templating import Jinja2Templates
 from sqlalchemy.orm import Session
@@ -7,6 +7,7 @@ from app.core.auth import clear_auth_cookie, create_access_token, set_auth_cooki
 from app.core.config import get_settings
 from app.core.database import get_db
 from app.modules.auth.dependencies import get_current_user
+from app.modules.auth.ldap import sync_all_users
 from app.modules.auth.schemas import UserOut
 from app.modules.auth.service import authenticate_user
 
@@ -27,6 +28,7 @@ async def login_page(request: Request):
 @router.post("/login", response_class=HTMLResponse)
 async def login(
     request: Request,
+    background_tasks: BackgroundTasks,
     username: str = Form(...),
     password: str = Form(...),
     db: Session = Depends(get_db),
@@ -39,6 +41,17 @@ async def login(
             {"nav_items": _NAV, "app_version": "0.1.0", "error": "Ungültige Zugangsdaten."},
             status_code=200,
         )
+    if settings.LDAP_ENABLED:
+        background_tasks.add_task(
+            sync_all_users,
+            username,
+            password,
+            settings.LDAP_SERVER,
+            settings.LDAP_DOMAIN,
+            settings.LDAP_SEARCH_BASE,
+            settings.LDAP_SYNC_MIN_INTERVAL_HOURS,
+            settings.LDAP_SYNC_LETTER_DELAY_SECONDS,
+        )
     token = create_access_token(username=user.username, is_admin=user.is_admin)
     response = RedirectResponse(url="/", status_code=303)
     set_auth_cookie(response, token)
@@ -47,7 +60,7 @@ async def login(
 
 @router.get("/logout")
 async def logout():
-    response = RedirectResponse(url="/auth/login", status_code=303)
+    response = RedirectResponse(url="/", status_code=303)
     clear_auth_cookie(response)
     return response
 

app/modules/auth/service.py

@@ -21,22 +21,41 @@ def get_user(db: Session, username: str) -> Optional[User]:
     return db.query(User).filter(User.username == username).first()
 
 
+def upsert_ldap_user(db: Session, attrs: dict) -> User:
+    """Create or update a User from LDAP attribute dict, commit and return."""
+    from app.modules.auth.ldap import _upsert_from_attrs
+    _upsert_from_attrs(db, attrs)
+    db.commit()
+    return get_user(db, attrs["username"])
+
+
 def authenticate_user(
     db: Session, username: str, password: str, ldap_enabled: bool
 ) -> Optional[User]:
     user = get_user(db, username)
-    if user is None or not user.is_active:
+
+    # Explicitly deactivated users are always blocked
+    if user is not None and not user.is_active:
         return None
 
-    local_ok = user.pw_hash is not None and verify_password(password, user.pw_hash)
+    # Local auth
-    if local_ok:
+    if user is not None and user.pw_hash is not None:
+        if verify_password(password, user.pw_hash):
+            _touch_last_login(db, user)
+            return user
+
+    # LDAP auth
+    if ldap_enabled:
+        from app.core.config import get_settings
+        from app.modules.auth.ldap import ldap_authenticate
+        s = get_settings()
+        attrs = ldap_authenticate(username, password, s.LDAP_SERVER, s.LDAP_DOMAIN)
+        if attrs is None:
+            return None
+        user = upsert_ldap_user(db, attrs)
         _touch_last_login(db, user)
         return user
 
-    if ldap_enabled:
-        # LDAP auth implemented in Part 2
-        pass
-
     return None
 
 

app/templates/base.html

@@ -28,10 +28,19 @@
       {{ item.label }}
     </a>
     {% endfor %}
-    <div class="ml-auto">
+    <div class="ml-auto flex items-center gap-3">
-      <button class="text-white text-sm px-4 py-1.5 rounded border border-white/40 bg-white/15 hover:bg-white/25">
+      {% if current_user | default(None) %}
-        Anmelden
+        <span class="text-white/85 text-sm">{{ current_user.username }}</span>
-      </button>
+        <a href="/auth/logout"
+           class="text-white text-sm px-4 py-1.5 rounded border border-white/40 bg-white/15 hover:bg-white/25">
+          Abmelden
+        </a>
+      {% else %}
+        <a href="/auth/login"
+           class="text-white text-sm px-4 py-1.5 rounded border border-white/40 bg-white/15 hover:bg-white/25">
+          Anmelden
+        </a>
+      {% endif %}
     </div>
   </nav>
 
@@ -46,4 +55,4 @@
   </footer>
 
 </body>
-</html>
+</html>

docs/superpowers/plans/2026-04-27-auth-part2-ldap.md

@@ -0,0 +1,832 @@
+# Auth Part 2: LDAP Integration Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** LDAP-Authentifizierung gegen das Active Directory der TH Nürnberg als Fallback zur lokalen Auth, mit login-getrigentem Background-Sync aller AD-User.
+
+**Architecture:** Neue Datei `app/modules/auth/ldap.py` enthält alle ldap3-Aufrufe (kein FastAPI, keine DB-Abhängigkeiten außer in `sync_all_users`). `service.py` füllt den bestehenden LDAP-Stub und legt User bei LDAP-Erfolg an. `router.py` startet den Sync als FastAPI `BackgroundTask`. `sync_all_users` erzeugt seine eigene DB-Session (long-running task).
+
+**Tech Stack:** ldap3, FastAPI BackgroundTasks, SQLAlchemy, pytest mit unittest.mock
+
+---
+
+### Task 1: Config-Erweiterungen
+
+**Files:**
+- Modify: `app/core/config.py`
+- Modify: `.env.example`
+- Modify: `tests/test_config.py`
+
+- [ ] **Step 1: Update `app/core/config.py`**
+
+```python
+from functools import lru_cache
+
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8")
+
+    APP_ENV: str = "development"
+    APP_PREFIX: str = ""
+    DATABASE_URL: str = "sqlite:///./app.db"
+    SECRET_KEY: str = "changeme-replace-in-production"
+    LDAP_ENABLED: bool = False
+    LDAP_SERVER: str = "gso1.ads1.fh-nuernberg.de"
+    LDAP_DOMAIN: str = "ADS1"
+    LDAP_SEARCH_BASE: str = "OU=users,OU=EFI,OU=Faculties,DC=ADS1,DC=fh-nuernberg,DC=de"
+    LDAP_SYNC_MIN_INTERVAL_HOURS: int = 12
+    LDAP_SYNC_LETTER_DELAY_SECONDS: float = 5.0
+    ADMIN_USERNAME: str = "admin"
+    ADMIN_PASSWORD: str = "change_me"
+
+
+@lru_cache
+def get_settings() -> Settings:
+    return Settings()
+```
+
+- [ ] **Step 2: Append to `.env.example`**
+
+Add these two lines in the development section (before the Produktion comment):
+
+```
+LDAP_SYNC_MIN_INTERVAL_HOURS=12
+LDAP_SYNC_LETTER_DELAY_SECONDS=5.0
+```
+
+- [ ] **Step 3: Add assertions to `tests/test_config.py`**
+
+Append to the existing `test_new_config_fields_have_defaults` function:
+
+```python
+    assert s.LDAP_SYNC_MIN_INTERVAL_HOURS == 12
+    assert s.LDAP_SYNC_LETTER_DELAY_SECONDS == 5.0
+```
+
+- [ ] **Step 4: Run test**
+
+```bash
+.venv/bin/pytest tests/test_config.py -v
+```
+
+Expected: PASS.
+
+- [ ] **Step 5: Commit**
+
+```bash
+git add app/core/config.py .env.example tests/test_config.py
+git commit -m "feat: add LDAP sync interval config fields"
+```
+
+---
+
+### Task 2: `app/modules/auth/ldap.py`
+
+**Files:**
+- Create: `app/modules/auth/ldap.py`
+- Create: `tests/test_ldap.py`
+
+- [ ] **Step 1: Write failing tests**
+
+Create `tests/test_ldap.py`:
+
+```python
+import time
+from datetime import datetime, timedelta, timezone
+from unittest.mock import MagicMock, patch
+
+import pytest
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy.pool import StaticPool
+
+from app.core.database import Base
+from app.modules.auth.ldap import (
+    _has_to_update,
+    _parse_entry,
+    _upsert_from_attrs,
+    ldap_authenticate,
+)
+from app.modules.auth.models import User
+
+
+# --- Helpers ---
+
+def _make_entry(**kwargs):
+    defaults = {
+        "sAMAccountName": "hofmannol",
+        "givenName": "Oliver",
+        "sn": "Hofmann",
+        "department": "EFI",
+        "description": "PF",
+        "accountExpires": None,
+    }
+    defaults.update(kwargs)
+
+    class _Attr:
+        def __init__(self, value):
+            self.value = value
+
+    class _Entry:
+        def __getitem__(self, key):
+            return _Attr(defaults.get(key))
+
+    return _Entry()
+
+
+@pytest.fixture
+def db():
+    engine = create_engine(
+        "sqlite:///:memory:",
+        connect_args={"check_same_thread": False},
+        poolclass=StaticPool,
+    )
+    Base.metadata.create_all(bind=engine)
+    Session = sessionmaker(bind=engine)
+    session = Session()
+    yield session
+    session.close()
+    Base.metadata.drop_all(bind=engine)
+
+
+# --- _parse_entry ---
+
+def test_parse_entry_basic():
+    result = _parse_entry(_make_entry())
+    assert result["username"] == "hofmannol"
+    assert result["full_name"] == "Oliver Hofmann"
+    assert result["department"] == "EFI"
+    assert result["role"] == "PF"
+    assert result["account_expires"] is None
+
+
+def test_parse_entry_truncates_long_fields():
+    result = _parse_entry(_make_entry(department="A" * 100))
+    assert len(result["department"]) == 64
+
+
+def test_parse_entry_uses_nn_for_none_fields():
+    result = _parse_entry(_make_entry(department=None, description=None))
+    assert result["department"] == "N.N."
+    assert result["role"] == "N.N."
+
+
+def test_parse_entry_handles_none_account_expires():
+    result = _parse_entry(_make_entry(accountExpires=None))
+    assert result["account_expires"] is None
+
+
+# --- _has_to_update ---
+
+def test_has_to_update_true_when_no_ldap_users(db):
+    assert _has_to_update(db, 12) is True
+
+
+def test_has_to_update_false_when_recent_ldap_user(db):
+    user = User(
+        username="u", full_name="U", pw_hash=None,
+        updated_at=datetime.now(timezone.utc),
+    )
+    db.add(user)
+    db.commit()
+    assert _has_to_update(db, 12) is False
+
+
+def test_has_to_update_true_when_old_ldap_user(db):
+    old_time = datetime.now(timezone.utc) - timedelta(hours=25)
+    user = User(username="u", full_name="U", pw_hash=None, updated_at=old_time)
+    db.add(user)
+    db.commit()
+    assert _has_to_update(db, 12) is True
+
+
+def test_has_to_update_ignores_local_users(db):
+    # Local user (pw_hash set) should NOT count for sync timing
+    user = User(
+        username="admin", full_name="Admin", pw_hash="hash",
+        updated_at=datetime.now(timezone.utc),
+    )
+    db.add(user)
+    db.commit()
+    assert _has_to_update(db, 12) is True
+
+
+# --- _upsert_from_attrs ---
+
+def test_upsert_creates_new_user(db):
+    attrs = {
+        "username": "newuser",
+        "full_name": "New User",
+        "department": "EFI",
+        "role": "ST",
+        "account_expires": None,
+    }
+    _upsert_from_attrs(db, attrs)
+    db.commit()
+    user = db.query(User).filter(User.username == "newuser").first()
+    assert user is not None
+    assert user.full_name == "New User"
+    assert user.pw_hash is None
+
+
+def test_upsert_updates_existing_user(db):
+    user = User(username="existing", full_name="Old Name", pw_hash=None)
+    db.add(user)
+    db.commit()
+    attrs = {
+        "username": "existing",
+        "full_name": "New Name",
+        "department": "EFI",
+        "role": "PF",
+        "account_expires": None,
+    }
+    _upsert_from_attrs(db, attrs)
+    db.commit()
+    db.refresh(user)
+    assert user.full_name == "New Name"
+    assert user.role == "PF"
+
+
+# --- ldap_authenticate ---
+
+@patch("app.modules.auth.ldap.Server")
+@patch("app.modules.auth.ldap.Connection")
+def test_ldap_authenticate_success(mock_conn_cls, mock_server_cls):
+    mock_conn = MagicMock()
+    mock_conn_cls.return_value = mock_conn
+    mock_conn.extend.standard.who_am_i.return_value = "u:ADS1\\hofmannol"
+    mock_conn.entries = [_make_entry()]
+
+    result = ldap_authenticate("hofmannol", "password", "server.example", "ADS1")
+
+    assert result is not None
+    assert result["username"] == "hofmannol"
+    assert result["full_name"] == "Oliver Hofmann"
+    mock_conn.bind.assert_called_once()
+    mock_conn.unbind.assert_called_once()
+
+
+@patch("app.modules.auth.ldap.Server")
+@patch("app.modules.auth.ldap.Connection")
+def test_ldap_authenticate_returns_none_on_socket_error(mock_conn_cls, mock_server_cls):
+    from ldap3.core.exceptions import LDAPSocketOpenError
+    mock_conn = MagicMock()
+    mock_conn_cls.return_value = mock_conn
+    mock_conn.bind.side_effect = LDAPSocketOpenError("unreachable")
+
+    result = ldap_authenticate("hofmannol", "pw", "server.example", "ADS1")
+    assert result is None
+
+
+@patch("app.modules.auth.ldap.Server")
+@patch("app.modules.auth.ldap.Connection")
+def test_ldap_authenticate_returns_none_when_who_am_i_empty(mock_conn_cls, mock_server_cls):
+    mock_conn = MagicMock()
+    mock_conn_cls.return_value = mock_conn
+    mock_conn.extend.standard.who_am_i.return_value = None
+
+    result = ldap_authenticate("hofmannol", "wrong", "server.example", "ADS1")
+    assert result is None
+    mock_conn.unbind.assert_called_once()
+
+
+@patch("app.modules.auth.ldap.Server")
+@patch("app.modules.auth.ldap.Connection")
+def test_ldap_authenticate_returns_none_when_no_entries(mock_conn_cls, mock_server_cls):
+    mock_conn = MagicMock()
+    mock_conn_cls.return_value = mock_conn
+    mock_conn.extend.standard.who_am_i.return_value = "u:ADS1\\hofmannol"
+    mock_conn.entries = []
+
+    result = ldap_authenticate("hofmannol", "pw", "server.example", "ADS1")
+    assert result is None
+```
+
+- [ ] **Step 2: Run to confirm failure**
+
+```bash
+.venv/bin/pytest tests/test_ldap.py -v
+```
+
+Expected: FAIL — `ModuleNotFoundError: No module named 'app.modules.auth.ldap'`
+
+- [ ] **Step 3: Create `app/modules/auth/ldap.py`**
+
+```python
+import logging
+import time
+from datetime import datetime, timedelta, timezone
+from typing import Optional
+
+from ldap3 import ALL, ALL_ATTRIBUTES, NTLM, Connection, Server
+from ldap3.core.exceptions import LDAPSocketOpenError
+from sqlalchemy.orm import Session
+
+from app.modules.auth.models import User
+
+logger = logging.getLogger(__name__)
+
+
+def ldap_authenticate(
+    username: str,
+    password: str,
+    ldap_server: str,
+    ldap_domain: str,
+) -> Optional[dict]:
+    """NTLM bind + fetch user attributes. Returns attrs dict on success, None on failure."""
+    server = Server(ldap_server, get_info=ALL, connect_timeout=8)
+    conn = Connection(
+        server,
+        user=f"{ldap_domain}\\{username}",
+        password=password,
+        authentication=NTLM,
+    )
+    try:
+        conn.bind()
+    except LDAPSocketOpenError:
+        logger.warning("LDAP server %s not reachable", ldap_server)
+        return None
+    except Exception:
+        logger.warning("LDAP bind failed for user %s", username, exc_info=True)
+        return None
+
+    if not conn.extend.standard.who_am_i():
+        conn.unbind()
+        return None
+
+    conn.search(
+        search_base=f"DC={ldap_domain},DC=fh-nuernberg,DC=de",
+        search_filter=f"(&(objectclass=user)(CN={username}))",
+        attributes=ALL_ATTRIBUTES,
+    )
+
+    if not conn.entries:
+        conn.unbind()
+        logger.warning("LDAP: user %s authenticated but no entry found", username)
+        return None
+
+    attrs = _parse_entry(conn.entries[0])
+    conn.unbind()
+    return attrs
+
+
+def _parse_entry(entry) -> dict:
+    def val(field: str, default: str = "N.N.") -> str:
+        try:
+            v = entry[field].value
+            return str(v)[:64] if v else default
+        except Exception:
+            return default
+
+    def expire_date(field: str) -> Optional[datetime]:
+        try:
+            v = entry[field].value
+            if v is None:
+                return None
+            if isinstance(v, datetime):
+                dt = v
+            else:
+                dt = datetime(v.year, v.month, v.day, tzinfo=timezone.utc)
+            if dt.tzinfo is None:
+                dt = dt.replace(tzinfo=timezone.utc)
+            return None if dt.year >= 2099 else dt
+        except Exception:
+            return None
+
+    return {
+        "username": val("sAMAccountName"),
+        "full_name": (f"{val('givenName', '')} {val('sn', '')}".strip() or "N.N."),
+        "department": val("department"),
+        "role": val("description"),
+        "account_expires": expire_date("accountExpires"),
+    }
+
+
+def _has_to_update(db: Session, min_interval_hours: int) -> bool:
+    """True if a background sync is due."""
+    deadline = datetime.now(timezone.utc) - timedelta(hours=min_interval_hours)
+    latest = (
+        db.query(User)
+        .filter(User.pw_hash.is_(None))
+        .order_by(User.updated_at.desc())
+        .first()
+    )
+    if latest is None:
+        return True
+    last = latest.updated_at
+    if last.tzinfo is None:
+        last = last.replace(tzinfo=timezone.utc)
+    return last < deadline
+
+
+def _upsert_from_attrs(db: Session, attrs: dict) -> None:
+    """Create or update a User from AD attribute dict (no commit)."""
+    user = db.query(User).filter(User.username == attrs["username"]).first()
+    if user is None:
+        user = User(username=attrs["username"])
+        db.add(user)
+    user.full_name = attrs["full_name"]
+    user.department = attrs["department"]
+    user.role = attrs["role"]
+    user.account_expires = attrs["account_expires"]
+
+
+def sync_all_users(
+    username: str,
+    password: str,
+    ldap_server: str,
+    ldap_domain: str,
+    ldap_search_base: str,
+    min_interval_hours: int,
+    letter_delay_seconds: float,
+) -> None:
+    """Login-triggered background sync of all AD users. Creates its own DB session."""
+    from app.core.database import SessionLocal
+
+    with SessionLocal() as db:
+        if not _has_to_update(db, min_interval_hours):
+            logger.info("LDAP sync skipped: last sync is recent")
+            return
+
+        server = Server(ldap_server, get_info=ALL, connect_timeout=8)
+        conn = Connection(
+            server,
+            user=f"{ldap_domain}\\{username}",
+            password=password,
+            authentication=NTLM,
+        )
+        try:
+            conn.bind()
+        except Exception:
+            logger.warning("LDAP sync: bind failed", exc_info=True)
+            return
+
+        found_usernames: set[str] = set()
+        chars = "abcdefghijklmnopqrstuvwxyz_"
+
+        for char in chars:
+            try:
+                conn.search(
+                    search_base=ldap_search_base,
+                    search_filter=f"(&(objectclass=user)(CN={char}*))",
+                    attributes=ALL_ATTRIBUTES,
+                )
+                for entry in conn.entries:
+                    try:
+                        attrs = _parse_entry(entry)
+                        found_usernames.add(attrs["username"])
+                        _upsert_from_attrs(db, attrs)
+                    except Exception:
+                        logger.warning("LDAP sync: failed to parse entry", exc_info=True)
+                db.commit()
+            except Exception:
+                logger.warning("LDAP sync: search failed for prefix '%s'", char, exc_info=True)
+
+            if letter_delay_seconds > 0:
+                time.sleep(letter_delay_seconds)
+
+        # Deactivate LDAP users no longer in AD
+        ldap_users = db.query(User).filter(User.pw_hash.is_(None)).all()
+        for user_obj in ldap_users:
+            if user_obj.username not in found_usernames:
+                logger.info("LDAP sync: deactivating %s (not in AD)", user_obj.username)
+                user_obj.is_active = False
+        db.commit()
+        conn.unbind()
+        logger.info("LDAP sync complete — %d users found", len(found_usernames))
+```
+
+- [ ] **Step 4: Run to confirm pass**
+
+```bash
+.venv/bin/pytest tests/test_ldap.py -v
+```
+
+Expected: All 14 tests PASS.
+
+- [ ] **Step 5: Run full suite**
+
+```bash
+.venv/bin/pytest -v
+```
+
+Expected: All tests PASS.
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add app/modules/auth/ldap.py tests/test_ldap.py
+git commit -m "feat: add LDAP functions (authenticate, sync, parse, upsert)"
+```
+
+---
+
+### Task 3: service.py — LDAP-Auth-Integration
+
+**Files:**
+- Modify: `app/modules/auth/service.py`
+- Modify: `tests/test_auth_service.py`
+
+- [ ] **Step 1: Append LDAP tests to `tests/test_auth_service.py`**
+
+```python
+# --- LDAP auth integration (uses mocked ldap_authenticate) ---
+
+from unittest.mock import patch as mock_patch
+
+
+def test_authenticate_creates_user_on_ldap_success(db):
+    ldap_attrs = {
+        "username": "newldap",
+        "full_name": "New LDAP User",
+        "department": "EFI",
+        "role": "ST",
+        "account_expires": None,
+    }
+    with mock_patch("app.modules.auth.ldap.ldap_authenticate", return_value=ldap_attrs):
+        user = authenticate_user(db, "newldap", "password", ldap_enabled=True)
+    assert user is not None
+    assert user.username == "newldap"
+    assert user.full_name == "New LDAP User"
+    assert user.last_login is not None
+
+
+def test_authenticate_updates_existing_user_on_ldap_success(db):
+    existing = User(username="existing", full_name="Old Name", pw_hash=None)
+    db.add(existing)
+    db.commit()
+    ldap_attrs = {
+        "username": "existing",
+        "full_name": "New Name",
+        "department": "EFI",
+        "role": "PF",
+        "account_expires": None,
+    }
+    with mock_patch("app.modules.auth.ldap.ldap_authenticate", return_value=ldap_attrs):
+        user = authenticate_user(db, "existing", "password", ldap_enabled=True)
+    assert user.full_name == "New Name"
+
+
+def test_authenticate_returns_none_on_ldap_failure(db):
+    with mock_patch("app.modules.auth.ldap.ldap_authenticate", return_value=None):
+        result = authenticate_user(db, "anyone", "wrong", ldap_enabled=True)
+    assert result is None
+
+
+def test_authenticate_blocked_user_not_bypassed_by_ldap(db):
+    blocked = User(username="blocked", full_name="B", pw_hash=None, is_active=False)
+    db.add(blocked)
+    db.commit()
+    ldap_attrs = {"username": "blocked", "full_name": "B", "department": "", "role": "", "account_expires": None}
+    with mock_patch("app.modules.auth.ldap.ldap_authenticate", return_value=ldap_attrs):
+        result = authenticate_user(db, "blocked", "any", ldap_enabled=True)
+    assert result is None
+```
+
+- [ ] **Step 2: Run to confirm new tests fail**
+
+```bash
+.venv/bin/pytest tests/test_auth_service.py -v -k "ldap"
+```
+
+Expected: FAIL — `authenticate_user` LDAP stub is still `pass`.
+
+- [ ] **Step 3: Replace `app/modules/auth/service.py`**
+
+```python
+from datetime import datetime, timezone
+from typing import Optional
+
+from passlib.context import CryptContext
+from sqlalchemy.orm import Session
+
+from app.modules.auth.models import User
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+
+def hash_password(plain: str) -> str:
+    return pwd_context.hash(plain)
+
+
+def verify_password(plain: str, hashed: str) -> bool:
+    return pwd_context.verify(plain, hashed)
+
+
+def get_user(db: Session, username: str) -> Optional[User]:
+    return db.query(User).filter(User.username == username).first()
+
+
+def upsert_ldap_user(db: Session, attrs: dict) -> User:
+    """Create or update a User from LDAP attribute dict, commit and return."""
+    from app.modules.auth.ldap import _upsert_from_attrs
+    _upsert_from_attrs(db, attrs)
+    db.commit()
+    return get_user(db, attrs["username"])
+
+
+def authenticate_user(
+    db: Session, username: str, password: str, ldap_enabled: bool
+) -> Optional[User]:
+    user = get_user(db, username)
+
+    # Explicitly deactivated users are always blocked
+    if user is not None and not user.is_active:
+        return None
+
+    # Local auth
+    if user is not None and user.pw_hash is not None:
+        if verify_password(password, user.pw_hash):
+            _touch_last_login(db, user)
+            return user
+
+    # LDAP auth
+    if ldap_enabled:
+        from app.core.config import get_settings
+        from app.modules.auth.ldap import ldap_authenticate
+        s = get_settings()
+        attrs = ldap_authenticate(username, password, s.LDAP_SERVER, s.LDAP_DOMAIN)
+        if attrs is None:
+            return None
+        user = upsert_ldap_user(db, attrs)
+        _touch_last_login(db, user)
+        return user
+
+    return None
+
+
+def _touch_last_login(db: Session, user: User) -> None:
+    user.last_login = datetime.now(timezone.utc)
+    db.commit()
+```
+
+- [ ] **Step 4: Run to confirm all service tests pass**
+
+```bash
+.venv/bin/pytest tests/test_auth_service.py -v
+```
+
+Expected: All 12 tests PASS (8 existing + 4 new).
+
+- [ ] **Step 5: Run full suite**
+
+```bash
+.venv/bin/pytest -v
+```
+
+Expected: All tests PASS.
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add app/modules/auth/service.py tests/test_auth_service.py
+git commit -m "feat: implement LDAP auth fallback in authenticate_user"
+```
+
+---
+
+### Task 4: router.py — BackgroundTask für Sync
+
+**Files:**
+- Modify: `app/modules/auth/router.py`
+- Modify: `tests/test_auth_router.py`
+
+- [ ] **Step 1: Add LDAP login test to `tests/test_auth_router.py`**
+
+Append this test to the existing file:
+
+```python
+from unittest.mock import patch as mock_patch
+
+
+def test_ldap_login_sets_cookie_and_redirects(client, override_db):
+    """LDAP login via mocked ldap_authenticate: cookie is set, redirects to /."""
+    ldap_attrs = {
+        "username": "ldapuser",
+        "full_name": "LDAP User",
+        "department": "EFI",
+        "role": "ST",
+        "account_expires": None,
+    }
+    with mock_patch("app.modules.auth.ldap.ldap_authenticate", return_value=ldap_attrs), \
+         mock_patch("app.modules.auth.ldap.sync_all_users"), \
+         mock_patch("app.modules.auth.router.settings") as mock_settings:
+        mock_settings.LDAP_ENABLED = True
+        mock_settings.LDAP_SERVER = "test"
+        mock_settings.LDAP_DOMAIN = "ADS1"
+        mock_settings.LDAP_SEARCH_BASE = "OU=test"
+        mock_settings.LDAP_SYNC_MIN_INTERVAL_HOURS = 12
+        mock_settings.LDAP_SYNC_LETTER_DELAY_SECONDS = 0.0
+        response = client.post("/auth/login", data={"username": "ldapuser", "password": "any"})
+    assert response.status_code in (302, 303, 307)
+    assert "access_token" in response.cookies
+
+```
+
+- [ ] **Step 2: Run to confirm failure**
+
+```bash
+.venv/bin/pytest tests/test_auth_router.py::test_ldap_login_sets_cookie_and_redirects -v
+```
+
+Expected: FAIL — Router importiert `sync_all_users` und `BackgroundTasks` noch nicht.
+
+- [ ] **Step 3: Replace `app/modules/auth/router.py`**
+
+```python
+from fastapi import APIRouter, BackgroundTasks, Depends, Form, Request
+from fastapi.responses import HTMLResponse, RedirectResponse
+from fastapi.templating import Jinja2Templates
+from sqlalchemy.orm import Session
+
+from app.core.auth import clear_auth_cookie, create_access_token, set_auth_cookie
+from app.core.config import get_settings
+from app.core.database import get_db
+from app.modules.auth.dependencies import get_current_user
+from app.modules.auth.ldap import sync_all_users
+from app.modules.auth.schemas import UserOut
+from app.modules.auth.service import authenticate_user
+
+router = APIRouter(prefix="/auth", tags=["auth"])
+templates = Jinja2Templates(directory="app/templates")
+settings = get_settings()
+
+_NAV: list[dict] = []
+
+
+@router.get("/login", response_class=HTMLResponse)
+async def login_page(request: Request):
+    return templates.TemplateResponse(
+        request, "auth/login.html", {"nav_items": _NAV, "app_version": "0.1.0"}
+    )
+
+
+@router.post("/login", response_class=HTMLResponse)
+async def login(
+    request: Request,
+    background_tasks: BackgroundTasks,
+    username: str = Form(...),
+    password: str = Form(...),
+    db: Session = Depends(get_db),
+):
+    user = authenticate_user(db, username, password, ldap_enabled=settings.LDAP_ENABLED)
+    if user is None:
+        return templates.TemplateResponse(
+            request,
+            "auth/login.html",
+            {"nav_items": _NAV, "app_version": "0.1.0", "error": "Ungültige Zugangsdaten."},
+            status_code=200,
+        )
+    if settings.LDAP_ENABLED:
+        background_tasks.add_task(
+            sync_all_users,
+            username,
+            password,
+            settings.LDAP_SERVER,
+            settings.LDAP_DOMAIN,
+            settings.LDAP_SEARCH_BASE,
+            settings.LDAP_SYNC_MIN_INTERVAL_HOURS,
+            settings.LDAP_SYNC_LETTER_DELAY_SECONDS,
+        )
+    token = create_access_token(username=user.username, is_admin=user.is_admin)
+    response = RedirectResponse(url="/", status_code=303)
+    set_auth_cookie(response, token)
+    return response
+
+
+@router.get("/logout")
+async def logout():
+    response = RedirectResponse(url="/", status_code=303)
+    clear_auth_cookie(response)
+    return response
+
+
+@router.get("/me", response_model=UserOut)
+async def me(user=Depends(get_current_user)):
+    return user
+```
+
+- [ ] **Step 4: Run all router tests**
+
+```bash
+.venv/bin/pytest tests/test_auth_router.py -v
+```
+
+Expected: All tests PASS.
+
+- [ ] **Step 5: Run full suite**
+
+```bash
+.venv/bin/pytest -v
+```
+
+Expected: All tests PASS.
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add app/modules/auth/router.py tests/test_auth_router.py
+git commit -m "feat: trigger LDAP background sync on successful login"
+```

docs/superpowers/specs/2026-04-27-auth-part2-ldap-design.md

@@ -0,0 +1,139 @@
+# Design Spec: Benutzerverwaltung Part 2 — LDAP-Integration
+
+**Datum:** 2026-04-27
+**Status:** Genehmigt
+
+---
+
+## Ziel
+
+LDAP-Authentifizierung gegen das Active Directory der TH Nürnberg als Fallback zur lokalen Auth. Bei erfolgreichem Login wird der lokale User-Eintrag angelegt/aktualisiert und ein Hintergrund-Sync aller AD-User angestoßen (login-getriggert, nicht periodisch).
+
+---
+
+## AD-Verbindungsparameter (bereits in config.py)
+
+| Setting | Wert |
+|---|---|
+| `LDAP_SERVER` | `gso1.ads1.fh-nuernberg.de` |
+| `LDAP_DOMAIN` | `ADS1` |
+| `LDAP_SEARCH_BASE` | `OU=users,OU=EFI,OU=Faculties,DC=ADS1,DC=fh-nuernberg,DC=de` |
+| `LDAP_ENABLED` | `False` (dev), `True` (prod) |
+
+---
+
+## Section 1: LDAP-Authentifizierung
+
+### Neue Config-Felder (`app/core/config.py`)
+
+```python
+LDAP_SYNC_MIN_INTERVAL_HOURS: int = 12     # Mindestabstand zwischen Syncs
+LDAP_SYNC_LETTER_DELAY_SECONDS: float = 5.0  # Wartezeit zwischen Buchstaben-Batches
+```
+
+### Neue Datei `app/modules/auth/ldap.py`
+
+Reine Funktionen — kein FastAPI, kein DB-Zugriff, nur ldap3.
+
+**`ldap_authenticate(username, password) -> dict | None`**
+Öffnet NTLM-Verbindung gegen `LDAP_SERVER`, bindet, liest User-Attribute und schließt die Verbindung wieder. Gibt bei Erfolg ein Dict zurück, bei falschem Passwort oder Verbindungsfehler `None` (Verbindungsfehler wird geloggt). Eine einzige Verbindung für Bind + Attributabfrage.
+
+Rückgabe-Dict:
+
+```python
+{
+    "username": str,       # sAMAccountName
+    "full_name": str,      # f"{givenName} {sn}"
+    "department": str,     # department (max 64 Zeichen, "N.N." wenn leer)
+    "role": str,           # description (max 64 Zeichen, "N.N." wenn leer)
+    "account_expires": datetime | None,  # accountExpires, None = kein Ablauf
+}
+```
+
+**`sync_all_users(username, password, db, settings) -> None`**
+Synchronisiert alle AD-User alphabetisch (a–z + `_`). Läuft in einem `BackgroundTask`-Thread:
+
+1. `has_to_update()` prüfen — wenn letzter Sync < `LDAP_SYNC_MIN_INTERVAL_HOURS`, abbrechen
+2. Neue NTLM-Verbindung mit den übergebenen Credentials öffnen
+3. Für jeden Buchstaben:
+   - AD-Einträge mit `CN=<buchstabe>*` laden
+   - Jeden Entry upserten (full_name, department, role, account_expires)
+   - `time.sleep(LDAP_SYNC_LETTER_DELAY_SECONDS)`
+4. User in lokaler DB die **nicht** in AD gefunden wurden UND `pw_hash is None` → `is_active = False`
+5. Verbindung schließen
+
+`has_to_update()` liest den Zeitstempel des zuletzt geänderten Users aus der DB (entspricht Vorversion).
+
+### Geänderte Datei `app/modules/auth/service.py`
+
+**Geänderter Auth-Flow in `authenticate_user`:**
+
+```
+1. user = get_user(db, username)
+2. user existiert UND is_active=False → return None  (absolute Sperre)
+3. user existiert UND pw_hash gesetzt:
+   → verify_password(password, pw_hash)
+   → OK: last_login setzen, return user
+4. ldap_enabled:
+   → attrs = ldap_authenticate(username, password)
+   → attrs is None: return None
+   → OK: upsert_ldap_user(db, attrs), last_login setzen, return user
+5. return None
+```
+
+**Neue Funktion `upsert_ldap_user(db, username, attrs) -> User`**
+Legt User an falls nicht vorhanden, schreibt AD-Felder (full_name, department, role, account_expires). Setzt `pw_hash` nicht (bleibt None für reine LDAP-User).
+
+### Geänderte Datei `app/modules/auth/router.py`
+
+`POST /auth/login` erhält einen `BackgroundTasks`-Parameter. Nach erfolgreichem LDAP-Login wird `sync_all_users` als BackgroundTask gestartet:
+
+```python
+@router.post("/login")
+async def login(background_tasks: BackgroundTasks, ...):
+    user = authenticate_user(...)
+    if user and settings.LDAP_ENABLED:
+        background_tasks.add_task(sync_all_users, username, password, db, settings)
+    ...
+```
+
+---
+
+## Section 2: AD-Sync-Logik
+
+### Sync-Verhalten
+
+| Situation | Aktion |
+|---|---|
+| User in AD, in DB | full_name, department, role, account_expires aktualisieren |
+| User in AD, nicht in DB | Neuen User anlegen (`is_active=True`, `pw_hash=None`) |
+| User nicht in AD, in DB, `pw_hash is None` | `is_active = False` |
+| User nicht in AD, in DB, `pw_hash` gesetzt | Unverändert (lokaler Account, z. B. Admin) |
+
+### Timing
+
+- Sync läuft nur wenn letzter Sync > `LDAP_SYNC_MIN_INTERVAL_HOURS` her
+- Zwischen jedem Buchstaben-Batch: `LDAP_SYNC_LETTER_DELAY_SECONDS` Sleep
+- Gesamtdauer ca. 27 × 5s ≈ 2–3 Minuten (im Hintergrund, blockiert nichts)
+
+---
+
+## Dateistruktur
+
+```
+app/modules/auth/
+├── ldap.py           # neu: ldap_authenticate, ldap_get_user_attrs, sync_all_users
+├── service.py        # geändert: LDAP-Stub füllen, upsert_ldap_user
+└── router.py         # geändert: BackgroundTasks in POST /auth/login
+app/core/
+└── config.py         # geändert: LDAP_SYNC_MIN_INTERVAL_HOURS, LDAP_SYNC_LETTER_DELAY_SECONDS
+```
+
+---
+
+## Out of Scope
+
+- Serviceaccount / periodischer Celery-Sync (→ mögliche spätere Erweiterung)
+- `account_expires`-Prüfung beim Login (Blockierung läuft über AD-Bind-Fehler und `is_active`)
+- Admin-UI für User-Verwaltung (→ separater Spec)
+- Gruppen aus AD (→ Part 3)

tests/test_auth_router.py

@@ -65,8 +65,35 @@ def test_login_unknown_user_shows_error(client):
     assert "Ungültige" in response.text
 
 
-def test_logout_clears_cookie(client, alice):
+def test_logout_clears_cookie_and_redirects_to_landing(client, alice):
     client.post("/auth/login", data={"username": "alice", "password": "secret123"})
     response = client.get("/auth/logout")
     assert response.status_code in (302, 303, 307)
+    assert response.headers["location"] == "/"
     assert response.cookies.get("access_token", "") == ""
+
+
+from unittest.mock import patch as mock_patch
+
+
+def test_ldap_login_sets_cookie_and_redirects(client, override_db):
+    """LDAP login via mocked ldap_authenticate: cookie is set, redirects to /."""
+    ldap_attrs = {
+        "username": "ldapuser",
+        "full_name": "LDAP User",
+        "department": "EFI",
+        "role": "ST",
+        "account_expires": None,
+    }
+    with mock_patch("app.modules.auth.ldap.ldap_authenticate", return_value=ldap_attrs), \
+         mock_patch("app.modules.auth.ldap.sync_all_users"), \
+         mock_patch("app.modules.auth.router.settings") as mock_settings:
+        mock_settings.LDAP_ENABLED = True
+        mock_settings.LDAP_SERVER = "test"
+        mock_settings.LDAP_DOMAIN = "ADS1"
+        mock_settings.LDAP_SEARCH_BASE = "OU=test"
+        mock_settings.LDAP_SYNC_MIN_INTERVAL_HOURS = 12
+        mock_settings.LDAP_SYNC_LETTER_DELAY_SECONDS = 0.0
+        response = client.post("/auth/login", data={"username": "ldapuser", "password": "any"})
+    assert response.status_code in (302, 303, 307)
+    assert "access_token" in response.cookies

tests/test_auth_service.py

@@ -67,3 +67,56 @@ def test_authenticate_no_pw_hash_no_ldap(db):
     db.add(user)
     db.commit()
     assert authenticate_user(db, "ldaponly", "any", ldap_enabled=False) is None
+
+
+# --- LDAP auth integration (uses mocked ldap_authenticate) ---
+
+from unittest.mock import patch as mock_patch
+
+
+def test_authenticate_creates_user_on_ldap_success(db):
+    ldap_attrs = {
+        "username": "newldap",
+        "full_name": "New LDAP User",
+        "department": "EFI",
+        "role": "ST",
+        "account_expires": None,
+    }
+    with mock_patch("app.modules.auth.ldap.ldap_authenticate", return_value=ldap_attrs):
+        user = authenticate_user(db, "newldap", "password", ldap_enabled=True)
+    assert user is not None
+    assert user.username == "newldap"
+    assert user.full_name == "New LDAP User"
+    assert user.last_login is not None
+
+
+def test_authenticate_updates_existing_user_on_ldap_success(db):
+    existing = User(username="existing", full_name="Old Name", pw_hash=None)
+    db.add(existing)
+    db.commit()
+    ldap_attrs = {
+        "username": "existing",
+        "full_name": "New Name",
+        "department": "EFI",
+        "role": "PF",
+        "account_expires": None,
+    }
+    with mock_patch("app.modules.auth.ldap.ldap_authenticate", return_value=ldap_attrs):
+        user = authenticate_user(db, "existing", "password", ldap_enabled=True)
+    assert user.full_name == "New Name"
+
+
+def test_authenticate_returns_none_on_ldap_failure(db):
+    with mock_patch("app.modules.auth.ldap.ldap_authenticate", return_value=None):
+        result = authenticate_user(db, "anyone", "wrong", ldap_enabled=True)
+    assert result is None
+
+
+def test_authenticate_blocked_user_not_bypassed_by_ldap(db):
+    blocked = User(username="blocked", full_name="B", pw_hash=None, is_active=False)
+    db.add(blocked)
+    db.commit()
+    ldap_attrs = {"username": "blocked", "full_name": "B", "department": "", "role": "", "account_expires": None}
+    with mock_patch("app.modules.auth.ldap.ldap_authenticate", return_value=ldap_attrs):
+        result = authenticate_user(db, "blocked", "any", ldap_enabled=True)
+    assert result is None

tests/test_config.py

@@ -9,3 +9,5 @@ def test_new_config_fields_have_defaults():
     assert s.LDAP_SERVER == "gso1.ads1.fh-nuernberg.de"
     assert s.LDAP_DOMAIN == "ADS1"
     assert "EFI" in s.LDAP_SEARCH_BASE
+    assert s.LDAP_SYNC_MIN_INTERVAL_HOURS == 12
+    assert s.LDAP_SYNC_LETTER_DELAY_SECONDS == 5.0

tests/test_landing.py

@@ -42,33 +42,51 @@ def auth_cookies(override_db):
     return {"access_token": token}
 
 
-def test_landing_without_auth_redirects(client):
+@pytest.fixture
+def admin_cookies(override_db):
+    user = User(username="adminuser", full_name="Admin User", is_admin=True, pw_hash=hash_password("pw"))
+    override_db.add(user)
+    override_db.commit()
+    token = create_access_token(username="adminuser", is_admin=True)
+    return {"access_token": token}
+
+
+def test_landing_accessible_without_auth(client):
     response = client.get("/")
-    assert response.status_code == 307
-    assert "/auth/login" in response.headers["location"]
-
-
-def test_landing_returns_html(client, auth_cookies):
-    response = client.get("/", cookies=auth_cookies)
     assert response.status_code == 200
     assert "text/html" in response.headers["content-type"]
 
 
-def test_landing_contains_title(client, auth_cookies):
+def test_landing_shows_no_modules_for_anonymous(client):
-    response = client.get("/", cookies=auth_cookies)
+    response = client.get("/")
-    assert "University Process Hub" in response.text
+    assert response.status_code == 200
+    assert "RSS-Feed Server" not in response.text
 
 
-def test_landing_contains_rss_module(client, auth_cookies):
+def test_landing_shows_modules_for_authenticated(client, auth_cookies):
     response = client.get("/", cookies=auth_cookies)
+    assert response.status_code == 200
     assert "RSS-Feed Server" in response.text
 
 
-def test_landing_navbar_links_present(client, auth_cookies):
+def test_landing_contains_title(client):
-    response = client.get("/", cookies=auth_cookies)
+    response = client.get("/")
-    assert "Übersicht" in response.text
+    assert "University Process Hub" in response.text
 
 
 def test_landing_info_strip_shows_db_mode(client, auth_cookies):
     response = client.get("/", cookies=auth_cookies)
     assert "SQLite" in response.text or "MariaDB" in response.text
+
+
+def test_navbar_shows_login_button_for_anonymous(client):
+    response = client.get("/")
+    assert "Anmelden" in response.text
+    assert "Abmelden" not in response.text
+
+
+def test_navbar_shows_username_and_logout_when_logged_in(client, auth_cookies):
+    response = client.get("/", cookies=auth_cookies)
+    assert "testuser" in response.text
+    assert "Abmelden" in response.text
+    assert "Anmelden" not in response.text

tests/test_ldap.py

@@ -0,0 +1,209 @@
+import time
+from datetime import datetime, timedelta, timezone
+from unittest.mock import MagicMock, patch
+
+import pytest
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy.pool import StaticPool
+
+from app.core.database import Base
+from app.modules.auth.ldap import (
+    _has_to_update,
+    _parse_entry,
+    _upsert_from_attrs,
+    ldap_authenticate,
+)
+from app.modules.auth.models import User
+
+
+# --- Helpers ---
+
+def _make_entry(**kwargs):
+    defaults = {
+        "sAMAccountName": "hofmannol",
+        "givenName": "Oliver",
+        "sn": "Hofmann",
+        "department": "EFI",
+        "description": "PF",
+        "accountExpires": None,
+    }
+    defaults.update(kwargs)
+
+    class _Attr:
+        def __init__(self, value):
+            self.value = value
+
+    class _Entry:
+        def __getitem__(self, key):
+            return _Attr(defaults.get(key))
+
+    return _Entry()
+
+
+@pytest.fixture
+def db():
+    engine = create_engine(
+        "sqlite:///:memory:",
+        connect_args={"check_same_thread": False},
+        poolclass=StaticPool,
+    )
+    Base.metadata.create_all(bind=engine)
+    Session = sessionmaker(bind=engine)
+    session = Session()
+    yield session
+    session.close()
+    Base.metadata.drop_all(bind=engine)
+
+
+# --- _parse_entry ---
+
+def test_parse_entry_basic():
+    result = _parse_entry(_make_entry())
+    assert result["username"] == "hofmannol"
+    assert result["full_name"] == "Oliver Hofmann"
+    assert result["department"] == "EFI"
+    assert result["role"] == "PF"
+    assert result["account_expires"] is None
+
+
+def test_parse_entry_truncates_long_fields():
+    result = _parse_entry(_make_entry(department="A" * 100))
+    assert len(result["department"]) == 64
+
+
+def test_parse_entry_uses_nn_for_none_fields():
+    result = _parse_entry(_make_entry(department=None, description=None))
+    assert result["department"] == "N.N."
+    assert result["role"] == "N.N."
+
+
+def test_parse_entry_handles_none_account_expires():
+    result = _parse_entry(_make_entry(accountExpires=None))
+    assert result["account_expires"] is None
+
+
+# --- _has_to_update ---
+
+def test_has_to_update_true_when_no_ldap_users(db):
+    assert _has_to_update(db, 12) is True
+
+
+def test_has_to_update_false_when_recent_ldap_user(db):
+    user = User(
+        username="u", full_name="U", pw_hash=None,
+        updated_at=datetime.now(timezone.utc),
+    )
+    db.add(user)
+    db.commit()
+    assert _has_to_update(db, 12) is False
+
+
+def test_has_to_update_true_when_old_ldap_user(db):
+    old_time = datetime.now(timezone.utc) - timedelta(hours=25)
+    user = User(username="u", full_name="U", pw_hash=None, updated_at=old_time)
+    db.add(user)
+    db.commit()
+    assert _has_to_update(db, 12) is True
+
+
+def test_has_to_update_ignores_local_users(db):
+    # Local user (pw_hash set) should NOT count for sync timing
+    user = User(
+        username="admin", full_name="Admin", pw_hash="hash",
+        updated_at=datetime.now(timezone.utc),
+    )
+    db.add(user)
+    db.commit()
+    assert _has_to_update(db, 12) is True
+
+
+# --- _upsert_from_attrs ---
+
+def test_upsert_creates_new_user(db):
+    attrs = {
+        "username": "newuser",
+        "full_name": "New User",
+        "department": "EFI",
+        "role": "ST",
+        "account_expires": None,
+    }
+    _upsert_from_attrs(db, attrs)
+    db.commit()
+    user = db.query(User).filter(User.username == "newuser").first()
+    assert user is not None
+    assert user.full_name == "New User"
+    assert user.pw_hash is None
+
+
+def test_upsert_updates_existing_user(db):
+    user = User(username="existing", full_name="Old Name", pw_hash=None)
+    db.add(user)
+    db.commit()
+    attrs = {
+        "username": "existing",
+        "full_name": "New Name",
+        "department": "EFI",
+        "role": "PF",
+        "account_expires": None,
+    }
+    _upsert_from_attrs(db, attrs)
+    db.commit()
+    db.refresh(user)
+    assert user.full_name == "New Name"
+    assert user.role == "PF"
+
+
+# --- ldap_authenticate ---
+
+@patch("app.modules.auth.ldap.Server")
+@patch("app.modules.auth.ldap.Connection")
+def test_ldap_authenticate_success(mock_conn_cls, mock_server_cls):
+    mock_conn = MagicMock()
+    mock_conn_cls.return_value = mock_conn
+    mock_conn.extend.standard.who_am_i.return_value = "u:ADS1\\hofmannol"
+    mock_conn.entries = [_make_entry()]
+
+    result = ldap_authenticate("hofmannol", "password", "server.example", "ADS1")
+
+    assert result is not None
+    assert result["username"] == "hofmannol"
+    assert result["full_name"] == "Oliver Hofmann"
+    mock_conn.bind.assert_called_once()
+    mock_conn.unbind.assert_called_once()
+
+
+@patch("app.modules.auth.ldap.Server")
+@patch("app.modules.auth.ldap.Connection")
+def test_ldap_authenticate_returns_none_on_socket_error(mock_conn_cls, mock_server_cls):
+    from ldap3.core.exceptions import LDAPSocketOpenError
+    mock_conn = MagicMock()
+    mock_conn_cls.return_value = mock_conn
+    mock_conn.bind.side_effect = LDAPSocketOpenError("unreachable")
+
+    result = ldap_authenticate("hofmannol", "pw", "server.example", "ADS1")
+    assert result is None
+
+
+@patch("app.modules.auth.ldap.Server")
+@patch("app.modules.auth.ldap.Connection")
+def test_ldap_authenticate_returns_none_when_who_am_i_empty(mock_conn_cls, mock_server_cls):
+    mock_conn = MagicMock()
+    mock_conn_cls.return_value = mock_conn
+    mock_conn.extend.standard.who_am_i.return_value = None
+
+    result = ldap_authenticate("hofmannol", "wrong", "server.example", "ADS1")
+    assert result is None
+    mock_conn.unbind.assert_called_once()
+
+
+@patch("app.modules.auth.ldap.Server")
+@patch("app.modules.auth.ldap.Connection")
+def test_ldap_authenticate_returns_none_when_no_entries(mock_conn_cls, mock_server_cls):
+    mock_conn = MagicMock()
+    mock_conn_cls.return_value = mock_conn
+    mock_conn.extend.standard.who_am_i.return_value = "u:ADS1\\hofmannol"
+    mock_conn.entries = []
+
+    result = ldap_authenticate("hofmannol", "pw", "server.example", "ADS1")
+    assert result is None