# -*- coding: utf-8 -*- # import inspect from functools import partial import time from typing import Callable from django.utils.http import urlencode from django.core.cache import cache from django.conf import settings from django.contrib import auth from django.utils.translation import ugettext as _ from rest_framework.request import Request from django.contrib.auth import ( BACKEND_SESSION_KEY, load_backend, PermissionDenied, user_login_failed, _clean_credentials, ) from django.core.exceptions import ImproperlyConfigured from django.shortcuts import reverse, redirect, get_object_or_404 from common.utils import get_request_ip, get_logger, bulk_get, FlashMessageUtil from acls.models import LoginACL from users.models import User from users.utils import LoginBlockUtil, MFABlockUtils, LoginIpBlockUtil from . import errors from .signals import post_auth_success, post_auth_failed logger = get_logger(__name__) def _get_backends(return_tuples=False): backends = [] for backend_path in settings.AUTHENTICATION_BACKENDS: backend = load_backend(backend_path) # 检查 backend 是否启用 if not backend.is_enabled(): continue backends.append((backend, backend_path) if return_tuples else backend) if not backends: raise ImproperlyConfigured( 'No authentication backends have been defined. Does ' 'AUTHENTICATION_BACKENDS contain anything?' ) return backends auth._get_backends = _get_backends def authenticate(request=None, **credentials): """ If the given credentials are valid, return a User object. 之所以 hack 这个 auticate """ username = credentials.get('username') for backend, backend_path in _get_backends(return_tuples=True): # 检查用户名是否允许认证 (预先检查，不浪费认证时间) logger.info('Try using auth backend: {}'.format(str(backend))) if not backend.username_allow_authenticate(username): continue # 原生 backend_signature = inspect.signature(backend.authenticate) try: backend_signature.bind(request, **credentials) except TypeError: # This backend doesn't accept these credentials as arguments. Try the next one. continue try: user = backend.authenticate(request, **credentials) except PermissionDenied: # This backend says to stop in our tracks - this user should not be allowed in at all. break if user is None: continue # 检查用户是否允许认证 if not backend.user_allow_authenticate(user): continue # Annotate the user object with the path of the backend. user.backend = backend_path return user # The credentials supplied are invalid to all backends, fire signal user_login_failed.send(sender=__name__, credentials=_clean_credentials(credentials), request=request) auth.authenticate = authenticate class CommonMixin: request: Request def get_request_ip(self): ip = '' if hasattr(self.request, 'data'): ip = self.request.data.get('remote_addr', '') ip = ip or get_request_ip(self.request) return ip def raise_credential_error(self, error): raise self.partial_credential_error(error=error) def _set_partial_credential_error(self, username, ip, request): self.partial_credential_error = partial( errors.CredentialError, username=username, ip=ip, request=request ) def get_user_from_session(self): if self.request.session.is_empty(): raise errors.SessionEmptyError() if all([ self.request.user, not self.request.user.is_anonymous, BACKEND_SESSION_KEY in self.request.session ]): user = self.request.user user.backend = self.request.session[BACKEND_SESSION_KEY] return user user_id = self.request.session.get('user_id') auth_password = self.request.session.get('auth_password') auth_expired_at = self.request.session.get('auth_password_expired_at') auth_expired = auth_expired_at < time.time() if auth_expired_at else False if not user_id or not auth_password or auth_expired: raise errors.SessionEmptyError() user = get_object_or_404(User, pk=user_id) user.backend = self.request.session.get("auth_backend") return user def get_auth_data(self, data): request = self.request items = ['username', 'password', 'challenge', 'public_key', 'auto_login'] username, password, challenge, public_key, auto_login = bulk_get(data, items, default='') ip = self.get_request_ip() self._set_partial_credential_error(username=username, ip=ip, request=request) password = password + challenge.strip() return username, password, public_key, ip, auto_login class AuthPreCheckMixin: request: Request get_request_ip: Callable raise_credential_error: Callable def _check_is_block(self, username, raise_exception=True): ip = self.get_request_ip() if LoginIpBlockUtil(ip).is_block(): raise errors.BlockGlobalIpLoginError(username=username, ip=ip) is_block = LoginBlockUtil(username, ip).is_block() if not is_block: return logger.warn('Ip was blocked' + ': ' + username + ':' + ip) exception = errors.BlockLoginError(username=username, ip=ip) if raise_exception: raise errors.BlockLoginError(username=username, ip=ip) else: return exception def check_is_block(self, raise_exception=True): if hasattr(self.request, 'data'): username = self.request.data.get("username") else: username = self.request.POST.get("username") self._check_is_block(username, raise_exception) def _check_only_allow_exists_user_auth(self, username): # 仅允许预先存在的用户认证 if not settings.ONLY_ALLOW_EXIST_USER_AUTH: return exist = User.objects.filter(username=username).exists() if not exist: logger.error(f"Only allow exist user auth, login failed: {username}") self.raise_credential_error(errors.reason_user_not_exist) class MFAMixin: request: Request get_user_from_session: Callable get_request_ip: Callable def _check_if_no_active_mfa(self, user): active_mfa_mapper = user.active_mfa_backends_mapper if not active_mfa_mapper: url = reverse('authentication:user-otp-enable-start') raise errors.MFAUnsetError(user, self.request, url) def _check_login_page_mfa_if_need(self, user): if not settings.SECURITY_MFA_IN_LOGIN_PAGE: return if not user.active_mfa_backends: return request = self.request data = request.data if hasattr(request, 'data') else request.POST code = data.get('code') mfa_type = data.get('mfa_type', 'otp') if not code: return self._do_check_user_mfa(code, mfa_type, user=user) def check_user_mfa_if_need(self, user): if self.request.session.get('auth_mfa'): return if not user.mfa_enabled: return active_mfa_names = user.active_mfa_backends_mapper.keys() raise errors.MFARequiredError(mfa_types=tuple(active_mfa_names)) def mark_mfa_ok(self, mfa_type): self.request.session['auth_mfa'] = 1 self.request.session['auth_mfa_time'] = time.time() self.request.session['auth_mfa_required'] = 0 self.request.session['auth_mfa_type'] = mfa_type def clean_mfa_mark(self): keys = ['auth_mfa', 'auth_mfa_time', 'auth_mfa_required', 'auth_mfa_type'] for k in keys: self.request.session.pop(k, '') def check_mfa_is_block(self, username, ip, raise_exception=True): blocked = MFABlockUtils(username, ip).is_block() if not blocked: return logger.warn('Ip was blocked' + ': ' + username + ':' + ip) exception = errors.BlockMFAError(username=username, request=self.request, ip=ip) if raise_exception: raise exception else: return exception def _do_check_user_mfa(self, code, mfa_type, user=None): user = user if user else self.get_user_from_session() if not user.mfa_enabled: return # 监测 MFA 是不是屏蔽了 ip = self.get_request_ip() self.check_mfa_is_block(user.username, ip) ok = False mfa_backend = user.get_mfa_backend_by_type(mfa_type) backend_error = _('The MFA type ({}) is not enabled') if not mfa_backend: msg = backend_error.format(mfa_type) elif not mfa_backend.is_active(): msg = backend_error.format(mfa_backend.display_name) else: ok, msg = mfa_backend.check_code(code) if ok: self.mark_mfa_ok(mfa_type) return raise errors.MFAFailedError( username=user.username, request=self.request, ip=ip, mfa_type=mfa_type, error=msg ) @staticmethod def get_user_mfa_context(user=None): mfa_backends = User.get_user_mfa_backends(user) return {'mfa_backends': mfa_backends} @staticmethod def incr_mfa_failed_time(username, ip): util = MFABlockUtils(username, ip) util.incr_failed_count() class AuthPostCheckMixin: @classmethod def generate_reset_password_url_with_flash_msg(cls, user, message): reset_passwd_url = reverse('authentication:reset-password') query_str = urlencode({ 'token': user.generate_reset_token() }) reset_passwd_url = f'{reset_passwd_url}?{query_str}' message_data = { 'title': _('Please change your password'), 'message': message, 'interval': 3, 'redirect_url': reset_passwd_url, } return FlashMessageUtil.gen_message_url(message_data) @classmethod def _check_passwd_is_too_simple(cls, user: User, password): if user.is_superuser and password == 'admin': message = _('Your password is too simple, please change it for security') url = cls.generate_reset_password_url_with_flash_msg(user, message=message) raise errors.PasswordTooSimple(url) @classmethod def _check_passwd_need_update(cls, user: User): if user.need_update_password: message = _('You should to change your password before login') url = cls.generate_reset_password_url_with_flash_msg(user, message) raise errors.PasswordNeedUpdate(url) @classmethod def _check_password_require_reset_or_not(cls, user: User): if user.password_has_expired: message = _('Your password has expired, please reset before logging in') url = cls.generate_reset_password_url_with_flash_msg(user, message) raise errors.PasswordRequireResetError(url) class AuthACLMixin: request: Request get_request_ip: Callable def _check_login_acl(self, user, ip): # ACL 限制用户登录 is_allowed, limit_type = LoginACL.allow_user_to_login(user, ip) if is_allowed: return if limit_type == 'ip': raise errors.LoginIPNotAllowed(username=user.username, request=self.request) elif limit_type == 'time': raise errors.TimePeriodNotAllowed(username=user.username, request=self.request) def get_ticket(self): from tickets.models import Ticket ticket_id = self.request.session.get("auth_ticket_id") logger.debug('Login confirm ticket id: {}'.format(ticket_id)) if not ticket_id: ticket = None else: ticket = Ticket.all().filter(id=ticket_id).first() return ticket def get_ticket_or_create(self, confirm_setting): ticket = self.get_ticket() if not ticket or ticket.status_closed: ticket = confirm_setting.create_confirm_ticket(self.request) self.request.session['auth_ticket_id'] = str(ticket.id) return ticket def check_user_login_confirm(self): ticket = self.get_ticket() if not ticket: raise errors.LoginConfirmOtherError('', "Not found") if ticket.status_open: raise errors.LoginConfirmWaitError(ticket.id) elif ticket.state_approve: self.request.session["auth_confirm"] = "1" return elif ticket.state_reject: raise errors.LoginConfirmOtherError( ticket.id, ticket.get_state_display() ) elif ticket.state_close: raise errors.LoginConfirmOtherError( ticket.id, ticket.get_state_display() ) else: raise errors.LoginConfirmOtherError( ticket.id, ticket.get_status_display() ) def check_user_login_confirm_if_need(self, user): ip = self.get_request_ip() is_allowed, confirm_setting = LoginACL.allow_user_confirm_if_need(user, ip) if self.request.session.get('auth_confirm') or not is_allowed: return self.get_ticket_or_create(confirm_setting) self.check_user_login_confirm() class AuthMixin(CommonMixin, AuthPreCheckMixin, AuthACLMixin, MFAMixin, AuthPostCheckMixin): request = None partial_credential_error = None key_prefix_captcha = "_LOGIN_INVALID_{}" def _check_auth_user_is_valid(self, username, password, public_key): user = authenticate( self.request, username=username, password=password, public_key=public_key ) if not user: self.raise_credential_error(errors.reason_password_failed) self.request.session['auth_backend'] = getattr(user, 'backend', settings.AUTH_BACKEND_MODEL) if user.is_expired: self.raise_credential_error(errors.reason_user_expired) elif not user.is_active: self.raise_credential_error(errors.reason_user_inactive) return user def set_login_failed_mark(self): ip = self.get_request_ip() cache.set(self.key_prefix_captcha.format(ip), 1, 3600) def check_is_need_captcha(self): # 最近有登录失败时需要填写验证码 ip = get_request_ip(self.request) need = cache.get(self.key_prefix_captcha.format(ip)) return need def check_user_auth(self, valid_data=None): # pre check self.check_is_block() username, password, public_key, ip, auto_login = self.get_auth_data(valid_data) self._check_only_allow_exists_user_auth(username) # check auth user = self._check_auth_user_is_valid(username, password, public_key) # 校验login-acl规则 self._check_login_acl(user, ip) # post check self._check_password_require_reset_or_not(user) self._check_passwd_is_too_simple(user, password) self._check_passwd_need_update(user) # 校验login-mfa, 如果登录页面上显示 mfa 的话 self._check_login_page_mfa_if_need(user) # 标记密码验证成功 self.mark_password_ok(user=user, auto_login=auto_login) LoginBlockUtil(user.username, ip).clean_failed_count() LoginIpBlockUtil(ip).clean_block_if_need() return user def mark_password_ok(self, user, auto_login=False): request = self.request request.session['auth_password'] = 1 request.session['auth_password_expired_at'] = time.time() + settings.AUTH_EXPIRED_SECONDS request.session['user_id'] = str(user.id) request.session['auto_login'] = auto_login request.session['auth_backend'] = getattr(user, 'backend', settings.AUTH_BACKEND_MODEL) def check_oauth2_auth(self, user: User, auth_backend): ip = self.get_request_ip() request = self.request self._set_partial_credential_error(user.username, ip, request) if user.is_expired: self.raise_credential_error(errors.reason_user_expired) elif not user.is_active: self.raise_credential_error(errors.reason_user_inactive) self._check_is_block(user.username) self._check_login_acl(user, ip) LoginBlockUtil(user.username, ip).clean_failed_count() LoginIpBlockUtil(ip).clean_block_if_need() MFABlockUtils(user.username, ip).clean_failed_count() self.mark_password_ok(user, False) return user def get_user_or_auth(self, valid_data): request = self.request if request.session.get('auth_password'): return self.get_user_from_session() else: return self.check_user_auth(valid_data) def clear_auth_mark(self): keys = ['auth_password', 'user_id', 'auth_confirm', 'auth_ticket_id'] for k in keys: self.request.session.pop(k, '') def send_auth_signal(self, success=True, user=None, username='', reason=''): if success: post_auth_success.send( sender=self.__class__, user=user, request=self.request ) else: post_auth_failed.send( sender=self.__class__, username=username, request=self.request, reason=reason ) def redirect_to_guard_view(self): guard_url = reverse('authentication:login-guard') args = self.request.META.get('QUERY_STRING', '') if args: guard_url = "%s?%s" % (guard_url, args) return redirect(guard_url)