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authentik/passbook/factors/password/factor.py

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"""passbook multi-factor authentication engine"""
from inspect import Signature
from typing import Optional
from django.contrib.auth import _clean_credentials
from django.contrib.auth.signals import user_login_failed
from django.core.exceptions import PermissionDenied
from django.forms.utils import ErrorList
from django.utils.translation import gettext as _
from django.views.generic import FormView
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from structlog import get_logger
from passbook.core.models import User
from passbook.factors.password.forms import PasswordForm
from passbook.flows.factor_base import AuthenticationFactor
from passbook.flows.views import AuthenticationView
from passbook.lib.config import CONFIG
from passbook.lib.utils.reflection import path_to_class
LOGGER = get_logger()
def authenticate(request, backends, **credentials) -> Optional[User]:
"""If the given credentials are valid, return a User object.
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Customized version of django's authenticate, which accepts a list of backends"""
for backend_path in backends:
backend = path_to_class(backend_path)()
try:
signature = Signature.from_callable(backend.authenticate)
signature.bind(request, **credentials)
except TypeError:
LOGGER.warning("Backend doesn't accept our arguments", backend=backend)
# This backend doesn't accept these credentials as arguments. Try the next one.
continue
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LOGGER.debug("Attempting authentication...", backend=backend)
try:
user = backend.authenticate(request, **credentials)
except PermissionDenied:
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LOGGER.debug("Backend threw PermissionDenied", backend=backend)
# This backend says to stop in our tracks - this user should not be allowed in at all.
break
if user is None:
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
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user_login_failed.send(
sender=__name__, credentials=_clean_credentials(credentials), request=request
)
class PasswordFactor(FormView, AuthenticationFactor):
"""Authentication factor which authenticates against django's AuthBackend"""
form_class = PasswordForm
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template_name = "login/factors/backend.html"
def form_valid(self, form):
"""Authenticate against django's authentication backend"""
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uid_fields = CONFIG.y("passbook.uid_fields")
kwargs = {
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"password": form.cleaned_data.get("password"),
}
for uid_field in uid_fields:
kwargs[uid_field] = getattr(self.authenticator.pending_user, uid_field)
try:
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user = authenticate(
self.request, self.authenticator.current_factor.backends, **kwargs
)
if user:
# User instance returned from authenticate() has .backend property set
self.authenticator.pending_user = user
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self.request.session[
AuthenticationView.SESSION_USER_BACKEND
] = user.backend
return self.authenticator.user_ok()
# No user was found -> invalid credentials
LOGGER.debug("Invalid credentials")
# Manually inject error into form
# pylint: disable=protected-access
errors = form._errors.setdefault("password", ErrorList())
errors.append(_("Invalid password"))
return self.form_invalid(form)
except PermissionDenied:
# User was found, but permission was denied (i.e. user is not active)
LOGGER.debug("Denied access", **kwargs)
return self.authenticator.user_invalid()