126 lines
5.5 KiB
Python
126 lines
5.5 KiB
Python
"""passbook multi-factor authentication engine"""
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from logging import getLogger
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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.views.generic import View
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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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LOGGER = getLogger(__name__)
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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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pending_user = None
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pending_factors = []
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_current_factor = None
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# Allow only not authenticated users to login
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def test_func(self):
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return self.request.user.is_authenticated is False
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def handle_no_permission(self):
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# Function from UserPassesTestMixin
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if 'next' in self.request.GET:
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return redirect(self.request.GET.get('next'))
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return redirect(reverse('passbook_core:overview'))
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def dispatch(self, request, *args, **kwargs):
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# Extract pending user from session (only remember uid)
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if AuthenticationView.SESSION_PENDING_USER in request.session:
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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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else:
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# No Pending user, redirect to login screen
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return redirect(reverse('passbook_core:auth-login'))
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# Write pending factors to session
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if AuthenticationView.SESSION_PENDING_FACTORS in request.session:
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self.pending_factors = request.session[AuthenticationView.SESSION_PENDING_FACTORS]
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else:
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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 rules here and block the request
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_all_factors = Factor.objects.filter(enabled=True)
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self.pending_factors = []
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for factor in _all_factors:
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if factor.passes(self.pending_user):
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self.pending_factors.append(_all_factors)
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# self.pending_factors = Factor
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# Read and instantiate factor from session
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factor_class = None
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if AuthenticationView.SESSION_FACTOR not in request.session:
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factor_class = self.pending_factors[0]
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else:
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factor_class = request.session[AuthenticationView.SESSION_FACTOR]
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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 = factor(self)
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self._current_factor.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("Passing GET to %s", class_to_path(self._current_factor.__class__))
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return self._current_factor.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("Passing POST to %s", class_to_path(self._current_factor.__class__))
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return self._current_factor.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("Factor %s passed", class_to_path(self._current_factor.__class__))
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# Remove passed factor from pending factors
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if class_to_path(self._current_factor.__class__) in self.pending_factors:
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self.pending_factors.remove(class_to_path(self._current_factor.__class__))
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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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self.request.session[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 is %s", next_factor)
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return redirect(reverse('passbook_core:auth-process', kwargs={'factor': next_factor}))
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# User passed all factors
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LOGGER.debug("User passed all factors, logging in")
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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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return redirect(reverse('passbook_core:auth-denied'))
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def _user_passed(self):
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"""User Successfully passed all factors"""
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# user = authenticate(request=self.request, )
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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 %s", self.pending_user)
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# Cleanup
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self._cleanup()
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return redirect(reverse('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 = ['SESSION_FACTOR', 'SESSION_PENDING_FACTORS',
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'SESSION_PENDING_USER', 'SESSION_USER_BACKEND', ]
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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 MFAPermissionDeniedView(PermissionDeniedView):
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"""User could not be authenticated"""
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