feat(auth): audit login success and failure attempts [FASE-3.2]

backend/app/routers/auth.py

@@ -11,39 +11,33 @@ import os
 
 from fastapi import APIRouter, Cookie, Depends, Request, Response
 from fastapi.security import OAuth2PasswordRequestForm
-from slowapi import Limiter
-from slowapi.util import get_remote_address
 from sqlalchemy.orm import Session
 
 from jose import jwt, JWTError
 
-from app.auth import create_access_token, blacklist_token
+from app.auth import create_access_token, blacklist_token, verify_password
 from app.config import settings
 from app.database import get_db
 from app.dependencies.auth import get_current_user
+from app.domain.errors import BusinessRuleViolation, PermissionViolation
 from app.domain.unit_of_work import UnitOfWork
+from app.limiter import limiter
+from app.middleware.request_context import resolve_client_ip
 from app.models.user import User
-from app.services.auth_service import authenticate_user, change_password as auth_change_password
+from app.services.auth_service import (
+    _DUMMY_HASH,
+    change_password as auth_change_password,
+)
+from app.services.audit_service import log_action
 from app.schemas.auth import TokenResponse, UserOut
 from app.schemas.user import PasswordChange
 
-# Rate limiter instance (shares backend state via app.state.limiter)
-limiter = Limiter(key_func=get_remote_address)
-
 router = APIRouter(prefix="/auth", tags=["auth"])
 
-# Detect whether we're behind HTTPS (production) so the cookie can be Secure
 _IS_HTTPS = os.environ.get("AEGIS_ENV", "").lower() == "production"
-
-# Cookie name used to transport the JWT
 _COOKIE_NAME = "aegis_token"
 
 
-# ---------------------------------------------------------------------------
-# POST /auth/login
-# ---------------------------------------------------------------------------
-
-
 @router.post("/login", response_model=TokenResponse)
 @limiter.limit("5/minute")
 def login(
@@ -54,19 +48,49 @@ def login(
 ):
     """Authenticate a user and return a JWT access token.
 
-    Rate-limited to **5 attempts per minute per IP** to prevent brute-force
-    attacks.  The token is set as an HttpOnly cookie **and** returned in the
-    JSON body for API/Swagger compatibility.
+    Rate-limited to **5 attempts per minute per IP**.  Failed and successful
+    logins are recorded in the audit log (SEC-009).
     """
-    user = authenticate_user(
+    user = db.query(User).filter(User.username == form_data.username).first()
+    target_hash = user.hashed_password if user else _DUMMY_HASH
+    password_valid = verify_password(form_data.password, target_hash)
+    ip = resolve_client_ip(request)
+
+    if user is None or not password_valid:
+        with UnitOfWork(db) as uow:
+            log_action(
                 db,
-        username=form_data.username,
-        password=form_data.password,
+                user.id if user else None,
+                "LOGIN_FAILED",
+                "auth",
+                None,
+                details={
+                    "username": form_data.username,
+                    "ip": ip,
+                    "reason": "invalid_credentials",
+                },
+                ip_address=ip,
             )
+            uow.commit()
+        raise BusinessRuleViolation("Incorrect username or password")
+
+    if not user.is_active:
+        raise PermissionViolation("Account is disabled. Contact an administrator.")
 
     access_token = create_access_token(data={"sub": user.username})
 
-    # Set HttpOnly cookie — inaccessible from JS
+    with UnitOfWork(db) as uow:
+        log_action(
+            db,
+            user.id,
+            "LOGIN_SUCCESS",
+            "auth",
+            str(user.id),
+            details={"username": user.username, "ip": ip},
+            ip_address=ip,
+        )
+        uow.commit()
+
     response.set_cookie(
         key=_COOKIE_NAME,
         value=access_token,
@@ -80,27 +104,13 @@ def login(
     return TokenResponse(access_token=access_token)
 
 
-# ---------------------------------------------------------------------------
-# POST /auth/logout
-# ---------------------------------------------------------------------------
-
-
 @router.post("/logout")
 def logout(
     request: Request,
     response: Response,
     aegis_token: str | None = Cookie(None),
 ):
-    """Clear the authentication cookie and revoke the current token.
-
-    The token's ``jti`` is added to the Redis blacklist so it cannot
-    be reused even if the cookie has already been copied elsewhere.
-    The blacklist entry auto-expires when the token's ``exp`` is reached.
-
-    When both HttpOnly cookie and ``Authorization: Bearer`` are present
-    (typical for API clients), **both** are revoked so the session cannot
-    survive on whichever credential the next request prefers.
-    """
+    """Clear the authentication cookie and revoke the current token."""
     bearer = (
         request.headers.get("Authorization")
         or request.headers.get("authorization")
@@ -124,7 +134,7 @@ def logout(
             if jti:
                 blacklist_token(jti, float(exp))
         except JWTError:
-            pass  # token already invalid — nothing to revoke for this raw value
+            pass
 
     response.delete_cookie(
         key=_COOKIE_NAME,
@@ -136,34 +146,19 @@ def logout(
     return {"detail": "Logged out"}
 
 
-# ---------------------------------------------------------------------------
-# GET /auth/me
-# ---------------------------------------------------------------------------
-
-
 @router.get("/me", response_model=UserOut)
 def read_current_user(current_user: User = Depends(get_current_user)):
     """Return the profile of the currently authenticated user."""
     return current_user
 
 
-# ---------------------------------------------------------------------------
-# POST /auth/change-password
-# ---------------------------------------------------------------------------
-
-
 @router.post("/change-password")
 def change_password(
     body: PasswordChange,
     db: Session = Depends(get_db),
     current_user: User = Depends(get_current_user),
 ):
-    """Change the current user's password.
-
-    Requires the current password for verification.  On success the
-    ``must_change_password`` flag is cleared so the user can proceed
-    normally.
-    """
+    """Change the current user's password."""
     auth_change_password(
         db,
         current_user,

backend/tests/test_auth_login_audit.py

@@ -0,0 +1,58 @@
+"""Tests for login attempt auditing (SEC-009)."""
+
+from app.models.audit import AuditLog
+
+
+def test_login_failed_creates_audit_entry(client, admin_user, db):
+    response = client.post(
+        "/api/v1/auth/login",
+        data={"username": "admin", "password": "wrong"},
+        headers={"X-Forwarded-For": "198.51.100.10", "User-Agent": "LoginAuditTest/1.0"},
+    )
+    assert response.status_code == 400
+
+    log = (
+        db.query(AuditLog)
+        .filter(AuditLog.action == "LOGIN_FAILED")
+        .order_by(AuditLog.timestamp.desc())
+        .first()
+    )
+    assert log is not None
+    assert log.entity_type == "auth"
+    assert log.details["username"] == "admin"
+    assert log.details["reason"] == "invalid_credentials"
+    assert log.ip_address == "198.51.100.10"
+    assert log.user_agent == "LoginAuditTest/1.0"
+    assert log.integrity_hash
+
+
+def test_login_success_creates_audit_entry(client, admin_user, db):
+    client.cookies.clear()
+    response = client.post(
+        "/api/v1/auth/login",
+        data={"username": "admin", "password": "admin123"},
+        headers={"X-Forwarded-For": "198.51.100.20"},
+    )
+    assert response.status_code == 200
+
+    log = (
+        db.query(AuditLog)
+        .filter(AuditLog.action == "LOGIN_SUCCESS")
+        .order_by(AuditLog.timestamp.desc())
+        .first()
+    )
+    assert log is not None
+    assert log.user_id == admin_user.id
+    assert log.ip_address == "198.51.100.20"
+    assert log.integrity_hash
+
+
+def test_login_unknown_user_still_audited(client, db):
+    response = client.post(
+        "/api/v1/auth/login",
+        data={"username": "nobody", "password": "password"},
+    )
+    assert response.status_code == 400
+    log = db.query(AuditLog).filter(AuditLog.action == "LOGIN_FAILED").first()
+    assert log is not None
+    assert log.user_id is None