252 lines
8.6 KiB
Python
252 lines
8.6 KiB
Python
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import dataclasses
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import typing as t
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from datetime import datetime
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from functools import cached_property
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import nacl
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import nacl.encoding
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import nacl.hash
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import nacl.secret
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import nacl.signing
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from asgiref.sync import sync_to_async
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from django.conf import settings
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from django.contrib.auth import get_user_model, user_logged_out, user_logged_in
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from django.utils import timezone
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from fastapi import APIRouter, Depends, status, Request, Response
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from fastapi.security import APIKeyHeader
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from pydantic import BaseModel
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from django_etebase import app_settings
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from django_etebase.models import UserInfo
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from django_etebase.serializers import UserSerializer
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from django_etebase.token_auth.models import AuthToken
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from django_etebase.token_auth.models import get_default_expiry
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from django_etebase.views import msgpack_encode, msgpack_decode
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from .execptions import AuthenticationFailed
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from .msgpack import MsgpackResponse, MsgpackRoute
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User = get_user_model()
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token_scheme = APIKeyHeader(name="Authorization")
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AUTO_REFRESH = True
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MIN_REFRESH_INTERVAL = 60
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authentication_router = APIRouter(route_class=MsgpackRoute)
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@dataclasses.dataclass(frozen=True)
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class AuthData:
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user: User
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token: AuthToken
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class LoginChallengeData(BaseModel):
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username: str
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class LoginResponse(BaseModel):
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username: str
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challenge: bytes
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host: str
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action: t.Literal["login", "changePassword"]
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class Authentication(BaseModel):
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response: bytes
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signature: bytes
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class Login(Authentication):
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@cached_property
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def response_data(self) -> LoginResponse:
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return LoginResponse(**msgpack_decode(self.response))
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class ChangePasswordResponse(LoginResponse):
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loginPubkey: bytes
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encryptedContent: bytes
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class ChangePassword(Authentication):
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@cached_property
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def response_data(self) -> ChangePasswordResponse:
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return ChangePasswordResponse(**msgpack_decode(self.response))
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def __renew_token(auth_token: AuthToken):
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current_expiry = auth_token.expiry
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new_expiry = get_default_expiry()
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# Throttle refreshing of token to avoid db writes
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delta = (new_expiry - current_expiry).total_seconds()
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if delta > MIN_REFRESH_INTERVAL:
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auth_token.expiry = new_expiry
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auth_token.save(update_fields=("expiry",))
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@sync_to_async
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def __get_authenticated_user(api_token: str):
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api_token = api_token.split()[1]
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try:
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token: AuthToken = AuthToken.objects.select_related("user").get(key=api_token)
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except AuthToken.DoesNotExist:
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raise AuthenticationFailed(detail="Invalid token.")
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if not token.user.is_active:
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raise AuthenticationFailed(detail="User inactive or deleted.")
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if token.expiry is not None:
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if token.expiry < timezone.now():
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token.delete()
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raise AuthenticationFailed(detail="Invalid token.")
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if AUTO_REFRESH:
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__renew_token(token)
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return token.user, token
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async def get_auth_data(api_token: str = Depends(token_scheme)) -> AuthData:
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user, token = await __get_authenticated_user(api_token)
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return AuthData(user, token)
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async def get_authenticated_user(api_token: str = Depends(token_scheme)) -> User:
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user, token = await __get_authenticated_user(api_token)
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return user
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@sync_to_async
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def __get_login_user(username: str) -> User:
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kwargs = {User.USERNAME_FIELD + "__iexact": username.lower()}
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try:
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user = User.objects.get(**kwargs)
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if not hasattr(user, "userinfo"):
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raise AuthenticationFailed(code="user_not_init", detail="User not properly init")
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return user
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except User.DoesNotExist:
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raise AuthenticationFailed(code="user_not_found", detail="User not found")
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async def get_login_user(challenge: LoginChallengeData) -> User:
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user = await __get_login_user(challenge.username)
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return user
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def get_encryption_key(salt):
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key = nacl.hash.blake2b(settings.SECRET_KEY.encode(), encoder=nacl.encoding.RawEncoder)
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return nacl.hash.blake2b(
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b"",
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key=key,
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salt=salt[: nacl.hash.BLAKE2B_SALTBYTES],
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person=b"etebase-auth",
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encoder=nacl.encoding.RawEncoder,
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)
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@sync_to_async
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def save_changed_password(data: ChangePassword, user: User):
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response_data = data.response_data
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user_info: UserInfo = user.userinfo
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user_info.loginPubkey = response_data.loginPubkey
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user_info.encryptedContent = response_data.encryptedContent
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user_info.save()
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@sync_to_async
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def login_response_data(user: User):
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return {
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"token": AuthToken.objects.create(user=user).key,
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"user": UserSerializer(user).data,
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}
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@sync_to_async
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def send_user_logged_in_async(user: User, request: Request):
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user_logged_in.send(sender=user.__class__, request=request, user=user)
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@sync_to_async
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def send_user_logged_out_async(user: User, request: Request):
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user_logged_out.send(sender=user.__class__, request=request, user=user)
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@sync_to_async
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def validate_login_request(
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validated_data: LoginResponse,
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challenge_sent_to_user: Authentication,
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user: User,
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expected_action: str,
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host_from_request: str,
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) -> t.Optional[MsgpackResponse]:
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enc_key = get_encryption_key(bytes(user.userinfo.salt))
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box = nacl.secret.SecretBox(enc_key)
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challenge_data = msgpack_decode(box.decrypt(validated_data.challenge))
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now = int(datetime.now().timestamp())
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if validated_data.action != expected_action:
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content = {
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"code": "wrong_action",
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"detail": 'Expected "{}" but got something else'.format(challenge_sent_to_user.response),
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}
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return MsgpackResponse(content, status_code=status.HTTP_400_BAD_REQUEST)
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elif now - challenge_data["timestamp"] > app_settings.CHALLENGE_VALID_SECONDS:
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content = {"code": "challenge_expired", "detail": "Login challenge has expired"}
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return MsgpackResponse(content, status_code=status.HTTP_400_BAD_REQUEST)
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elif challenge_data["userId"] != user.id:
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content = {"code": "wrong_user", "detail": "This challenge is for the wrong user"}
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return MsgpackResponse(content, status_code=status.HTTP_400_BAD_REQUEST)
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elif not settings.DEBUG and validated_data.host.split(":", 1)[0] != host_from_request:
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detail = 'Found wrong host name. Got: "{}" expected: "{}"'.format(validated_data.host, host_from_request)
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content = {"code": "wrong_host", "detail": detail}
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return MsgpackResponse(content, status_code=status.HTTP_400_BAD_REQUEST)
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verify_key = nacl.signing.VerifyKey(bytes(user.userinfo.loginPubkey), encoder=nacl.encoding.RawEncoder)
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try:
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verify_key.verify(challenge_sent_to_user.response, challenge_sent_to_user.signature)
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except nacl.exceptions.BadSignatureError:
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return MsgpackResponse(
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{"code": "login_bad_signature", "detail": "Wrong password for user."},
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status_code=status.HTTP_401_UNAUTHORIZED,
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)
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return None
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@authentication_router.post("/login_challenge/")
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async def login_challenge(user: User = Depends(get_login_user)):
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enc_key = get_encryption_key(user.userinfo.salt)
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box = nacl.secret.SecretBox(enc_key)
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challenge_data = {
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"timestamp": int(datetime.now().timestamp()),
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"userId": user.id,
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}
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challenge = bytes(box.encrypt(msgpack_encode(challenge_data), encoder=nacl.encoding.RawEncoder))
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return MsgpackResponse({"salt": user.userinfo.salt, "version": user.userinfo.version, "challenge": challenge})
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@authentication_router.post("/login/")
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async def login(data: Login, request: Request):
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user = await get_login_user(LoginChallengeData(username=data.response_data.username))
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host = request.headers.get("Host")
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bad_login_response = await validate_login_request(data.response_data, data, user, "login", host)
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if bad_login_response is not None:
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return bad_login_response
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data = await login_response_data(user)
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await send_user_logged_in_async(user, request)
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return MsgpackResponse(data, status_code=status.HTTP_200_OK)
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@authentication_router.post("/logout/")
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async def logout(request: Request, auth_data: AuthData = Depends(get_auth_data)):
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await sync_to_async(auth_data.token.delete)()
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await send_user_logged_out_async(auth_data.user, request)
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return Response(status_code=status.HTTP_204_NO_CONTENT)
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@authentication_router.post("/change_password/")
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async def change_password(data: ChangePassword, request: Request, user: User = Depends(get_authenticated_user)):
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host = request.headers.get("Host")
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bad_login_response = await validate_login_request(data.response_data, data, user, "changePassword", host)
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if bad_login_response is not None:
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return bad_login_response
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await save_changed_password(data, user)
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return Response(status_code=status.HTTP_204_NO_CONTENT)
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