forked from CGM_Public/pretix_original
Update webauthn requirement from ==0.4.* to ==2.0.* (#3880)
* Get rid of unmaintained dependency python-u2flib-server * Update webauthn requirement from ==0.4.* to ==2.0.* * Fix tests * Update src/pretix/control/views/auth.py Co-authored-by: Richard Schreiber <schreiber@rami.io> * Update src/pretix/control/views/auth.py Co-authored-by: Richard Schreiber <schreiber@rami.io> * Update src/pretix/control/views/user.py Co-authored-by: Richard Schreiber <schreiber@rami.io> * Update src/pretix/control/views/user.py Co-authored-by: Richard Schreiber <schreiber@rami.io> * Update src/pretix/control/views/user.py Co-authored-by: Richard Schreiber <schreiber@rami.io> --------- Co-authored-by: Richard Schreiber <schreiber@rami.io>
This commit is contained in:
Raphael Michel
@@ -35,10 +35,9 @@
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import base64
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import json
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import logging
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import os
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import time
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from collections import defaultdict
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from urllib.parse import quote, urlparse
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from urllib.parse import quote
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import webauthn
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from django.conf import settings
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@@ -57,6 +56,7 @@ from django.views.generic import FormView, ListView, TemplateView, UpdateView
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from django_otp.plugins.otp_static.models import StaticDevice
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from django_otp.plugins.otp_totp.models import TOTPDevice
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from django_scopes import scopes_disabled
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from webauthn.helpers import generate_challenge, generate_user_handle
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from pretix.base.auth import get_auth_backends
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from pretix.base.forms.auth import ReauthForm
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@@ -70,9 +70,9 @@ from pretix.control.forms.users import StaffSessionForm
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from pretix.control.permissions import (
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AdministratorPermissionRequiredMixin, StaffMemberRequiredMixin,
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)
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from pretix.control.views.auth import get_u2f_appid
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from pretix.control.views.auth import get_u2f_appid, get_webauthn_rp_id
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from pretix.helpers.http import redirect_to_url
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from pretix.helpers.webauthn import generate_challenge, generate_ukey
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from pretix.helpers.u2f import websafe_encode
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REAL_DEVICE_TYPES = (TOTPDevice, WebAuthnDevice, U2FDevice)
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logger = logging.getLogger(__name__)
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@@ -105,25 +105,41 @@ class ReauthView(TemplateView):
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devices = U2FDevice.objects.filter(user=self.request.user)
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for d in devices:
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credential_current_sign_count = d.sign_count if isinstance(d, WebAuthnDevice) else 0
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try:
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wu = d.webauthnuser
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if isinstance(d, U2FDevice):
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# RP_ID needs to be appId for U2F devices, but we can't
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# set it that way in U2FDevice.webauthnuser, since that
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# breaks the frontend part.
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wu.rp_id = settings.SITE_URL
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webauthn_assertion_response = webauthn.WebAuthnAssertionResponse(
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wu,
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resp,
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challenge,
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settings.SITE_URL,
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uv_required=False # User Verification
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webauthn_assertion_response = webauthn.verify_authentication_response(
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credential=resp,
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expected_challenge=base64.b64decode(challenge),
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expected_rp_id=get_webauthn_rp_id(self.request),
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expected_origin=settings.SITE_URL,
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credential_public_key=d.webauthnpubkey,
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credential_current_sign_count=credential_current_sign_count,
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)
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sign_count = webauthn_assertion_response.verify()
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sign_count = webauthn_assertion_response.new_sign_count
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if sign_count < credential_current_sign_count:
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raise Exception("Possible replay attack, sign count not higher")
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except Exception:
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logger.exception('U2F login failed')
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if isinstance(d, U2FDevice):
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# https://www.w3.org/TR/webauthn/#sctn-appid-extension says
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# "When verifying the assertion, expect that the rpIdHash MAY be the hash of the AppID instead of the RP ID."
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try:
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webauthn_assertion_response = webauthn.verify_authentication_response(
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credential=resp,
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expected_challenge=base64.b64decode(challenge),
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expected_rp_id=get_u2f_appid(self.request),
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expected_origin=settings.SITE_URL,
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credential_public_key=d.webauthnpubkey,
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credential_current_sign_count=credential_current_sign_count,
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)
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if webauthn_assertion_response.new_sign_count < 1:
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raise Exception("Possible replay attack, sign count set")
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except Exception:
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logger.exception('U2F login failed')
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else:
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valid = True
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break
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else:
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logger.exception('Webauthn login failed')
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else:
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if isinstance(d, WebAuthnDevice):
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d.sign_count = sign_count
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@@ -162,23 +178,24 @@ class ReauthView(TemplateView):
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ctx = super().get_context_data()
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if 'webauthn_challenge' in self.request.session:
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del self.request.session['webauthn_challenge']
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challenge = generate_challenge(32)
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self.request.session['webauthn_challenge'] = challenge
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challenge = generate_challenge()
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self.request.session['webauthn_challenge'] = base64.b64encode(challenge).decode()
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devices = [
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device.webauthnuser for device in WebAuthnDevice.objects.filter(confirmed=True, user=self.request.user)
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device.webauthndevice for device in WebAuthnDevice.objects.filter(confirmed=True, user=self.request.user)
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] + [
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device.webauthnuser for device in U2FDevice.objects.filter(confirmed=True, user=self.request.user)
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device.webauthndevice for device in U2FDevice.objects.filter(confirmed=True, user=self.request.user)
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]
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if devices:
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webauthn_assertion_options = webauthn.WebAuthnAssertionOptions(
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devices,
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challenge
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auth_options = webauthn.generate_authentication_options(
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rp_id=get_webauthn_rp_id(self.request),
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challenge=challenge,
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allow_credentials=devices,
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)
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ad = webauthn_assertion_options.assertion_dict
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ad['extensions'] = {
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'appid': get_u2f_appid(self.request)
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}
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ctx['jsondata'] = json.dumps(ad)
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# Backwards compatibility to U2F
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j = json.loads(webauthn.options_to_json(auth_options))
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j["extensions"] = {"appid": get_u2f_appid(self.request)}
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ctx['jsondata'] = json.dumps(j)
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ctx['form'] = self.form
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return ctx
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@@ -387,23 +404,26 @@ class User2FADeviceConfirmWebAuthnView(RecentAuthenticationRequiredMixin, Templa
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if 'webauthn_challenge' in self.request.session:
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del self.request.session['webauthn_challenge']
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challenge = generate_challenge(32)
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ukey = generate_ukey()
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challenge = generate_challenge()
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ukey = generate_user_handle()
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self.request.session['webauthn_challenge'] = challenge
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self.request.session['webauthn_register_ukey'] = ukey
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self.request.session['webauthn_challenge'] = base64.b64encode(challenge).decode()
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self.request.session['webauthn_register_ukey'] = base64.b64encode(ukey).decode()
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make_credential_options = webauthn.WebAuthnMakeCredentialOptions(
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challenge,
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urlparse(settings.SITE_URL).netloc,
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urlparse(settings.SITE_URL).netloc,
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ukey,
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self.request.user.email,
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str(self.request.user),
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settings.SITE_URL,
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attestation="none"
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devices = [
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device.webauthndevice for device in WebAuthnDevice.objects.filter(confirmed=True, user=self.request.user)
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] + [
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device.webauthndevice for device in U2FDevice.objects.filter(confirmed=True, user=self.request.user)
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]
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make_credential_options = webauthn.generate_registration_options(
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rp_id=get_webauthn_rp_id(self.request),
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rp_name=get_webauthn_rp_id(self.request),
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user_id=ukey,
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user_name=self.request.user.email,
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challenge=challenge,
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exclude_credentials=devices,
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)
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ctx['jsondata'] = json.dumps(make_credential_options.registration_dict)
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ctx['jsondata'] = webauthn.options_to_json(make_credential_options)
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return ctx
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@@ -412,30 +432,13 @@ class User2FADeviceConfirmWebAuthnView(RecentAuthenticationRequiredMixin, Templa
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challenge = self.request.session['webauthn_challenge']
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ukey = self.request.session['webauthn_register_ukey']
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resp = json.loads(self.request.POST.get("token"))
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trust_anchor_dir = os.path.normpath(os.path.join(
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os.path.dirname(os.path.abspath(__file__)),
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'../../static/webauthn_trusted_attestation_roots' # currently does not exist
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))
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# We currently do not check attestation certificates, since there's no real risk
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# and we do not have any policies specifying what devices can be used. (Also, we
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# didn't get it to work.)
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# Read more: https://fidoalliance.org/fido-technotes-the-truth-about-attestation/
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trusted_attestation_cert_required = False
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self_attestation_permitted = True
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none_attestation_permitted = True
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webauthn_registration_response = webauthn.WebAuthnRegistrationResponse(
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urlparse(settings.SITE_URL).netloc,
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settings.SITE_URL,
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resp,
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challenge,
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trust_anchor_dir,
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trusted_attestation_cert_required,
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self_attestation_permitted,
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none_attestation_permitted,
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uv_required=False
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registration_verification = webauthn.verify_registration_response(
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credential=resp,
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expected_challenge=base64.b64decode(challenge),
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expected_rp_id=get_webauthn_rp_id(self.request),
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expected_origin=settings.SITE_URL,
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)
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webauthn_credential = webauthn_registration_response.verify()
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# Check that the credentialId is not yet registered to any other user.
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# If registration is requested for a credential that is already registered
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@@ -443,7 +446,7 @@ class User2FADeviceConfirmWebAuthnView(RecentAuthenticationRequiredMixin, Templa
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# ceremony, or it MAY decide to accept the registration, e.g. while deleting
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# the older registration.
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credential_id_exists = WebAuthnDevice.objects.filter(
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credential_id=webauthn_credential.credential_id
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credential_id=registration_verification.credential_id
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).first()
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if credential_id_exists:
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messages.error(request, _('This security device is already registered.'))
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@@ -451,14 +454,11 @@ class User2FADeviceConfirmWebAuthnView(RecentAuthenticationRequiredMixin, Templa
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'device': self.device.pk
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}))
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webauthn_credential.credential_id = str(webauthn_credential.credential_id, "utf-8")
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webauthn_credential.public_key = str(webauthn_credential.public_key, "utf-8")
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self.device.credential_id = webauthn_credential.credential_id
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self.device.ukey = ukey
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self.device.pub_key = webauthn_credential.public_key
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self.device.sign_count = webauthn_credential.sign_count
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self.device.rp_id = urlparse(settings.SITE_URL).netloc
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self.device.credential_id = websafe_encode(registration_verification.credential_id)
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self.device.ukey = websafe_encode(ukey)
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self.device.pub_key = websafe_encode(registration_verification.credential_public_key)
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self.device.sign_count = registration_verification.sign_count
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self.device.rp_id = get_webauthn_rp_id(request)
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self.device.icon_url = settings.SITE_URL
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self.device.confirmed = True
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self.device.save()
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