mirror of
https://github.com/wowlikon/LiB.git
synced 2026-02-04 04:31:09 +00:00
320 lines
11 KiB
Python
320 lines
11 KiB
Python
"""Модуль основного функционала авторизации и аутентификации"""
|
||
|
||
from datetime import datetime, timedelta, timezone
|
||
from typing import Annotated
|
||
from uuid import uuid4
|
||
import hashlib
|
||
import os
|
||
|
||
from argon2.low_level import hash_secret_raw, Type
|
||
from cryptography.hazmat.primitives.ciphers.aead import AESGCM
|
||
from fastapi import Depends, HTTPException, status
|
||
from fastapi.security import OAuth2PasswordBearer
|
||
from jose import jwt, JWTError, ExpiredSignatureError
|
||
from passlib.context import CryptContext
|
||
from sqlmodel import Session, select
|
||
|
||
from library_service.models.db import User
|
||
from library_service.models.dto import TokenData
|
||
from library_service.settings import get_session, get_logger
|
||
|
||
|
||
# Конфигурация JWT из переменных окружения
|
||
ALGORITHM = os.getenv("ALGORITHM", "HS256")
|
||
PARTIAL_TOKEN_EXPIRE_MINUTES = int(os.getenv("PARTIAL_TOKEN_EXPIRE_MINUTES", "5"))
|
||
ACCESS_TOKEN_EXPIRE_MINUTES = int(os.getenv("ACCESS_TOKEN_EXPIRE_MINUTES", "15"))
|
||
REFRESH_TOKEN_EXPIRE_DAYS = int(os.getenv("REFRESH_TOKEN_EXPIRE_DAYS", "7"))
|
||
|
||
# Конфигурация хэширования из переменных окружения
|
||
ARGON2_TYPE = os.getenv("ARGON2_TYPE", "id")
|
||
ARGON2_TIME_COST = int(os.getenv("ARGON2_TIME_COST", "3"))
|
||
ARGON2_MEMORY_COST = int(os.getenv("ARGON2_MEMORY_COST", "131072"))
|
||
ARGON2_PARALLELISM = int(os.getenv("ARGON2_PARALLELISM", "2"))
|
||
ARGON2_SALT_LENGTH = int(os.getenv("ARGON2_SALT_LENGTH", "16"))
|
||
ARGON2_HASH_LENGTH = int(os.getenv("ARGON2_HASH_LENGTH", "48"))
|
||
|
||
# Конфигурация кодов восстановления
|
||
RECOVERY_CODES_COUNT = int(os.getenv("RECOVERY_CODES_COUNT", "10"))
|
||
RECOVERY_CODE_SEGMENTS = int(os.getenv("RECOVERY_CODE_SEGMENTS", "4"))
|
||
RECOVERY_CODE_SEGMENT_BYTES = int(os.getenv("RECOVERY_CODE_SEGMENT_BYTES", "2"))
|
||
RECOVERY_MIN_REMAINING_WARNING = int(os.getenv("RECOVERY_MIN_REMAINING_WARNING", "3"))
|
||
RECOVERY_MAX_AGE_DAYS = int(os.getenv("RECOVERY_MAX_AGE_DAYS", "365"))
|
||
|
||
SECRET_KEY = os.getenv("SECRET_KEY")
|
||
|
||
# Получение логгера
|
||
logger = get_logger()
|
||
|
||
# OAuth2 схема
|
||
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/auth/token")
|
||
|
||
|
||
class KeyDeriver:
|
||
def __init__(self, master_key: bytes):
|
||
self.master_key = master_key
|
||
|
||
def derive(
|
||
self,
|
||
context: str,
|
||
key_len: int = 32,
|
||
time_cost: int = 12,
|
||
memory_cost: int = 512 * 1024,
|
||
parallelism: int = 4,
|
||
) -> bytes:
|
||
"""
|
||
Формирование разных ключей из одного.
|
||
context: любая строка, например "aes", "hmac", "totp"
|
||
"""
|
||
salt = hashlib.sha256(context.encode("utf-8")).digest()
|
||
key = hash_secret_raw(
|
||
secret=self.master_key,
|
||
salt=salt,
|
||
time_cost=time_cost,
|
||
memory_cost=memory_cost,
|
||
parallelism=parallelism,
|
||
hash_len=key_len,
|
||
type=Type.ID,
|
||
)
|
||
return key
|
||
|
||
|
||
class AES256Cipher:
|
||
def __init__(self, key: bytes):
|
||
if len(key) != 32:
|
||
raise ValueError("AES-256 требует ключ длиной 32 байта")
|
||
self.key = key
|
||
self.aesgcm = AESGCM(key)
|
||
|
||
def encrypt(self, plaintext: bytes, nonce_len: int = 12) -> bytes:
|
||
"""Зашифровывает данные с помощью AES256-GCM"""
|
||
nonce = os.urandom(nonce_len)
|
||
ct = self.aesgcm.encrypt(nonce, plaintext, associated_data=None)
|
||
return nonce + ct
|
||
|
||
def decrypt(self, data: bytes, nonce_len: int = 12) -> bytes:
|
||
"""Расшифровывает данные с помощью AES256-GCM"""
|
||
nonce = data[:nonce_len]
|
||
ct = data[nonce_len:]
|
||
return self.aesgcm.decrypt(nonce, ct, associated_data=None)
|
||
|
||
|
||
# Проверка секретного ключа
|
||
if not SECRET_KEY:
|
||
raise RuntimeError("SECRET_KEY environment variable is required")
|
||
|
||
deriver = KeyDeriver(SECRET_KEY.encode())
|
||
|
||
jwt_key = deriver.derive("jwt", key_len=32)
|
||
|
||
aes_key = deriver.derive("totp", key_len=32)
|
||
cipher = AES256Cipher(aes_key)
|
||
|
||
|
||
# Хэширование паролей
|
||
pwd_context = CryptContext(
|
||
schemes=["argon2"],
|
||
deprecated="auto",
|
||
argon2__type=ARGON2_TYPE,
|
||
argon2__time_cost=ARGON2_TIME_COST,
|
||
argon2__memory_cost=ARGON2_MEMORY_COST,
|
||
argon2__parallelism=ARGON2_PARALLELISM,
|
||
argon2__salt_len=ARGON2_SALT_LENGTH,
|
||
argon2__hash_len=ARGON2_HASH_LENGTH,
|
||
)
|
||
|
||
|
||
def verify_password(plain_password: str, hashed_password: str) -> bool:
|
||
"""Проверяет пароль по его хешу"""
|
||
return pwd_context.verify(plain_password, hashed_password)
|
||
|
||
|
||
def get_password_hash(password: str) -> str:
|
||
"""Хэширует пароль"""
|
||
return pwd_context.hash(password)
|
||
|
||
|
||
def _create_token(
|
||
data: dict,
|
||
expires_delta: timedelta,
|
||
token_type: str,
|
||
is_partial: bool = False,
|
||
) -> str:
|
||
"""Базовая функция создания токена"""
|
||
now = datetime.now(timezone.utc)
|
||
to_encode = {
|
||
**data,
|
||
"iat": now,
|
||
"exp": now + expires_delta,
|
||
"type": token_type,
|
||
"partial": is_partial,
|
||
}
|
||
if token_type == "refresh":
|
||
to_encode.update({"jti": str(uuid4())})
|
||
return jwt.encode(to_encode, jwt_key, algorithm=ALGORITHM)
|
||
|
||
|
||
def create_partial_token(data: dict) -> str:
|
||
"""Создает partial токен для незавершённой 2FA аутентификации"""
|
||
delta = timedelta(minutes=PARTIAL_TOKEN_EXPIRE_MINUTES)
|
||
return _create_token(data, delta, "partial", is_partial=True)
|
||
|
||
|
||
def create_access_token(data: dict, expires_delta: timedelta | None = None) -> str:
|
||
"""Создает JWT access токен"""
|
||
delta = expires_delta or timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
|
||
return _create_token(data, delta, "access")
|
||
|
||
|
||
def create_refresh_token(data: dict) -> str:
|
||
"""Создает JWT refresh токен"""
|
||
return _create_token(data, timedelta(days=REFRESH_TOKEN_EXPIRE_DAYS), "refresh")
|
||
|
||
|
||
def decode_token(
|
||
token: str,
|
||
expected_type: str = "access",
|
||
allow_partial: bool = False,
|
||
) -> TokenData:
|
||
"""Декодирует и проверяет JWT токен"""
|
||
token_error = HTTPException(
|
||
status_code=status.HTTP_401_UNAUTHORIZED,
|
||
headers={"WWW-Authenticate": "Bearer"},
|
||
)
|
||
try:
|
||
payload = jwt.decode(token, jwt_key, algorithms=[ALGORITHM])
|
||
username: str | None = payload.get("sub")
|
||
user_id: int | None = payload.get("user_id")
|
||
token_type: str | None = payload.get("type")
|
||
is_partial: bool = payload.get("partial", False)
|
||
|
||
if token_type == "partial":
|
||
if not allow_partial:
|
||
token_error.detail = "2FA verification required"
|
||
raise token_error
|
||
elif token_type != expected_type:
|
||
token_error.detail = f"Invalid token type. Expected {expected_type}"
|
||
raise token_error
|
||
|
||
if username is None or user_id is None:
|
||
token_error.detail = "Could not validate credentials"
|
||
raise token_error
|
||
|
||
return TokenData(username=username, user_id=user_id, is_partial=is_partial)
|
||
except ExpiredSignatureError:
|
||
token_error.detail = "Token expired"
|
||
raise token_error
|
||
except JWTError:
|
||
token_error.detail = "Could not validate credentials"
|
||
raise token_error
|
||
|
||
|
||
def authenticate_user(session: Session, username: str, password: str) -> User | None:
|
||
"""Аутентифицирует пользователя по имени и паролю"""
|
||
statement = select(User).where(User.username == username)
|
||
user = session.exec(statement).first()
|
||
if not user or not verify_password(password, user.hashed_password):
|
||
return None
|
||
return user
|
||
|
||
|
||
def get_current_user(
|
||
token: Annotated[str, Depends(oauth2_scheme)],
|
||
session: Session = Depends(get_session),
|
||
) -> User:
|
||
"""Возвращает текущего авторизованного пользователя"""
|
||
token_data = decode_token(token)
|
||
|
||
user = session.get(User, token_data.user_id)
|
||
if user is None:
|
||
raise HTTPException(
|
||
status_code=status.HTTP_401_UNAUTHORIZED,
|
||
detail="User not found",
|
||
headers={"WWW-Authenticate": "Bearer"},
|
||
)
|
||
return user
|
||
|
||
|
||
def get_current_active_user(
|
||
current_user: Annotated[User, Depends(get_current_user)],
|
||
) -> User:
|
||
"""Проверяет активность пользователя и возвращает его"""
|
||
if not current_user.is_active:
|
||
raise HTTPException(
|
||
status_code=status.HTTP_403_FORBIDDEN, detail="Inactive user"
|
||
)
|
||
return current_user
|
||
|
||
|
||
def get_user_from_partial_token(
|
||
token: Annotated[str, Depends(oauth2_scheme)],
|
||
session: Session = Depends(get_session),
|
||
) -> User:
|
||
"""Возвращает пользователя из partial токена (для 2FA верификации)"""
|
||
token_data = decode_token(token, expected_type="access", allow_partial=True)
|
||
|
||
if not token_data.is_partial:
|
||
raise HTTPException(
|
||
status_code=status.HTTP_400_BAD_REQUEST,
|
||
detail="Full token provided, 2FA not required",
|
||
)
|
||
|
||
user = session.get(User, token_data.user_id)
|
||
if user is None:
|
||
raise HTTPException(
|
||
status_code=status.HTTP_401_UNAUTHORIZED,
|
||
detail="User not found",
|
||
headers={"WWW-Authenticate": "Bearer"},
|
||
)
|
||
return user
|
||
|
||
|
||
def require_role(role_name: str):
|
||
"""Создает dependency для проверки наличия определенной роли"""
|
||
|
||
def role_checker(current_user: User = Depends(get_current_active_user)) -> User:
|
||
user_roles = [role.name for role in current_user.roles]
|
||
if role_name not in user_roles:
|
||
raise HTTPException(
|
||
status_code=status.HTTP_403_FORBIDDEN,
|
||
detail=f"Role '{role_name}' required",
|
||
)
|
||
return current_user
|
||
|
||
return role_checker
|
||
|
||
|
||
def require_any_role(allowed_roles: list[str]):
|
||
"""Создает dependency для проверки наличия хотя бы одной из ролей"""
|
||
|
||
def role_checker(current_user: User = Depends(get_current_active_user)) -> User:
|
||
user_roles = {role.name for role in current_user.roles}
|
||
if not (user_roles & set(allowed_roles)):
|
||
raise HTTPException(
|
||
status_code=status.HTTP_403_FORBIDDEN,
|
||
detail=f"Requires one of roles: {allowed_roles}",
|
||
)
|
||
return current_user
|
||
|
||
return role_checker
|
||
|
||
|
||
# Создание dependencies
|
||
RequireAuth = Annotated[User, Depends(get_current_active_user)]
|
||
RequireAdmin = Annotated[User, Depends(require_role("admin"))]
|
||
RequireMember = Annotated[User, Depends(require_role("member"))]
|
||
RequireLibrarian = Annotated[User, Depends(require_role("librarian"))]
|
||
RequirePartialAuth = Annotated[User, Depends(get_user_from_partial_token)]
|
||
RequireStaff = Annotated[User, Depends(require_any_role(["admin", "librarian"]))]
|
||
|
||
|
||
def is_user_staff(user: User) -> bool:
|
||
"""Проверяет, является ли пользователь сотрудником (admin или librarian)"""
|
||
roles = {role.name for role in user.roles}
|
||
return bool(roles & {"admin", "librarian"})
|
||
|
||
|
||
def is_user_admin(user: User) -> bool:
|
||
"""Проверяет, является ли пользователь администратором"""
|
||
roles = {role.name for role in user.roles}
|
||
return "admin" in roles
|