198 lines
8.1 KiB
Python
198 lines
8.1 KiB
Python
"""passbook multi-factor authentication engine"""
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from typing import List, Tuple
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from django.contrib.auth import login
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from django.contrib.auth.mixins import UserPassesTestMixin
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from django.shortcuts import get_object_or_404, redirect, reverse
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from django.utils.http import urlencode
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from django.views.generic import View
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from structlog import get_logger
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from passbook.core.models import Factor, User
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from passbook.core.views.utils import PermissionDeniedView
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from passbook.lib.utils.reflection import class_to_path, path_to_class
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from passbook.lib.utils.urls import is_url_absolute
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from passbook.policies.engine import PolicyEngine
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LOGGER = get_logger()
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# Argument used to redirect user after login
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NEXT_ARG_NAME = "next"
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def _redirect_with_qs(view, get_query_set=None):
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"""Wrapper to redirect whilst keeping GET Parameters"""
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target = reverse(view)
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if get_query_set:
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target += "?" + urlencode(get_query_set.items())
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return redirect(target)
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class AuthenticationView(UserPassesTestMixin, View):
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"""Wizard-like Multi-factor authenticator"""
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SESSION_FACTOR = "passbook_factor"
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SESSION_PENDING_FACTORS = "passbook_pending_factors"
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SESSION_PENDING_USER = "passbook_pending_user"
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SESSION_USER_BACKEND = "passbook_user_backend"
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SESSION_IS_SSO_LOGIN = "passbook_sso_login"
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pending_user: User
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pending_factors: List[Tuple[str, str]] = []
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_current_factor_class: Factor
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current_factor: Factor
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# Allow only not authenticated users to login
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def test_func(self):
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return AuthenticationView.SESSION_PENDING_USER in self.request.session
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def handle_no_permission(self):
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# Function from UserPassesTestMixin
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if NEXT_ARG_NAME in self.request.GET:
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return redirect(self.request.GET.get(NEXT_ARG_NAME))
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if self.request.user.is_authenticated:
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return _redirect_with_qs("passbook_core:overview", self.request.GET)
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return _redirect_with_qs("passbook_core:auth-login", self.request.GET)
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def get_pending_factors(self):
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"""Loading pending factors from Database or load from session variable"""
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# Write pending factors to session
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if AuthenticationView.SESSION_PENDING_FACTORS in self.request.session:
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return self.request.session[AuthenticationView.SESSION_PENDING_FACTORS]
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# Get an initial list of factors which are currently enabled
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# and apply to the current user. We check policies here and block the request
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_all_factors = (
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Factor.objects.filter(enabled=True).order_by("order").select_subclasses()
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)
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pending_factors = []
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for factor in _all_factors:
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LOGGER.debug(
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"Checking if factor applies to user",
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factor=factor,
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user=self.pending_user,
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)
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policy_engine = PolicyEngine(
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factor.policies.all(), self.pending_user, self.request
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)
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policy_engine.build()
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if policy_engine.passing:
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pending_factors.append((factor.uuid.hex, factor.type))
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LOGGER.debug("Factor applies", factor=factor, user=self.pending_user)
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return pending_factors
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def dispatch(self, request, *args, **kwargs):
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# Check if user passes test (i.e. SESSION_PENDING_USER is set)
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user_test_result = self.get_test_func()()
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if not user_test_result:
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return self.handle_no_permission()
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# Extract pending user from session (only remember uid)
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self.pending_user = get_object_or_404(
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User, id=self.request.session[AuthenticationView.SESSION_PENDING_USER]
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)
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self.pending_factors = self.get_pending_factors()
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# Read and instantiate factor from session
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factor_uuid, factor_class = None, None
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if AuthenticationView.SESSION_FACTOR not in request.session:
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# Case when no factors apply to user, return error denied
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if not self.pending_factors:
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# Case when user logged in from SSO provider and no more factors apply
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if AuthenticationView.SESSION_IS_SSO_LOGIN in request.session:
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LOGGER.debug("User authenticated with SSO, logging in...")
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return self._user_passed()
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return self.user_invalid()
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factor_uuid, factor_class = self.pending_factors[0]
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else:
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factor_uuid, factor_class = request.session[
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AuthenticationView.SESSION_FACTOR
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]
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# Lookup current factor object
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self.current_factor = (
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Factor.objects.filter(uuid=factor_uuid).select_subclasses().first()
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)
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# Instantiate Next Factor and pass request
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factor = path_to_class(factor_class)
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self._current_factor_class = factor(self)
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self._current_factor_class.pending_user = self.pending_user
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self._current_factor_class.request = request
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return super().dispatch(request, *args, **kwargs)
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def get(self, request, *args, **kwargs):
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"""pass get request to current factor"""
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LOGGER.debug(
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"Passing GET",
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view_class=class_to_path(self._current_factor_class.__class__),
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)
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return self._current_factor_class.get(request, *args, **kwargs)
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def post(self, request, *args, **kwargs):
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"""pass post request to current factor"""
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LOGGER.debug(
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"Passing POST",
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view_class=class_to_path(self._current_factor_class.__class__),
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)
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return self._current_factor_class.post(request, *args, **kwargs)
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def user_ok(self):
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"""Redirect to next Factor"""
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LOGGER.debug(
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"Factor passed",
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factor_class=class_to_path(self._current_factor_class.__class__),
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)
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# Remove passed factor from pending factors
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current_factor_tuple = (
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self.current_factor.uuid.hex,
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class_to_path(self._current_factor_class.__class__),
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)
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if current_factor_tuple in self.pending_factors:
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self.pending_factors.remove(current_factor_tuple)
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next_factor = None
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if self.pending_factors:
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next_factor = self.pending_factors.pop()
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# Save updated pening_factor list to session
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self.request.session[
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AuthenticationView.SESSION_PENDING_FACTORS
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] = self.pending_factors
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self.request.session[AuthenticationView.SESSION_FACTOR] = next_factor
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LOGGER.debug("Rendering Factor", next_factor=next_factor)
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return _redirect_with_qs("passbook_core:auth-process", self.request.GET)
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# User passed all factors
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LOGGER.debug("User passed all factors, logging in", user=self.pending_user)
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return self._user_passed()
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def user_invalid(self):
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"""Show error message, user cannot login.
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This should only be shown if user authenticated successfully, but is disabled/locked/etc"""
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LOGGER.debug("User invalid")
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self.cleanup()
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return _redirect_with_qs("passbook_core:auth-denied", self.request.GET)
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def _user_passed(self):
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"""User Successfully passed all factors"""
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backend = self.request.session[AuthenticationView.SESSION_USER_BACKEND]
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login(self.request, self.pending_user, backend=backend)
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LOGGER.debug("Logged in", user=self.pending_user)
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# Cleanup
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self.cleanup()
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next_param = self.request.GET.get(NEXT_ARG_NAME, None)
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if next_param and not is_url_absolute(next_param):
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return redirect(next_param)
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return _redirect_with_qs("passbook_core:overview")
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def cleanup(self):
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"""Remove temporary data from session"""
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session_keys = [
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self.SESSION_FACTOR,
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self.SESSION_PENDING_FACTORS,
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self.SESSION_PENDING_USER,
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self.SESSION_USER_BACKEND,
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]
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for key in session_keys:
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if key in self.request.session:
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del self.request.session[key]
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LOGGER.debug("Cleaned up sessions")
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class FactorPermissionDeniedView(PermissionDeniedView):
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"""User could not be authenticated"""
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