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pretix_cgo/src/pretix/presale/views/oidc_op.py

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#
# This file is part of pretix (Community Edition).
#
# Copyright (C) 2014-2020 Raphael Michel and contributors
# Copyright (C) 2020-2021 rami.io GmbH and contributors
#
# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
# Public License as published by the Free Software Foundation in version 3 of the License.
#
# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
# this file, see <https://pretix.eu/about/en/license>.
#
# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
# details.
#
# You should have received a copy of the GNU Affero General Public License along with this program. If not, see
# <https://www.gnu.org/licenses/>.
#
import base64
import hashlib
import time
from binascii import unhexlify
from datetime import timedelta
from urllib.parse import parse_qs, urlencode, urlparse, urlunparse
from Crypto.PublicKey import RSA
from django.db import transaction
from django.http import Http404, HttpResponse, JsonResponse
from django.shortcuts import redirect, render
from django.utils.crypto import get_random_string
from django.utils.decorators import method_decorator
from django.utils.timezone import now
from django.views import View
from django.views.decorators.cache import never_cache
from django.views.decorators.csrf import csrf_exempt
from django.views.decorators.debug import sensitive_post_parameters
from pretix.base.customersso.oidc import (
_get_or_create_server_keypair, customer_claims, generate_id_token,
)
from pretix.base.models.customers import (
CustomerSSOAccessToken, CustomerSSOClient, CustomerSSOGrant,
)
from pretix.helpers.http import redirect_to_url
from pretix.multidomain.middlewares import CsrfViewMiddleware
from pretix.multidomain.urlreverse import build_absolute_uri
from pretix.presale.forms.customer import AuthenticationForm
from pretix.presale.utils import customer_login, get_customer_auth_time
"""
We implement the OpenID Connect spec as per https://openid.net/specs/openid-connect-core-1_0.html
Based on the OAuth spec as per https://www.rfc-editor.org/rfc/rfc6749
We implement all three flows (authorization code, implicit, hybrid), as well as some typical standard
claims.
We currently do not implement the following optional parts of the spec:
- 4. Initiating Login from a Third Party
- 5.5. Requesting Claims using the "claims" Request Parameter
- 5.6.2. Aggregated and Distributed Claims
- 6. Passing Request Parameters as JWTs
- 8.1. Pairwise Identifier Algorithm
- 9. Client Authentication (except for client_secret_basic, client_secret_post)
- 10.2. Encryption
- 11. Offline Access
- 12. Using Refresh Tokens
We also implement the Discovery extension (without issuer discovery)
as per https://openid.net/specs/openid-connect-discovery-1_0.html
The implementation passed the certification tests against the following profiles, but we did not
acquire formal certification:
- Basic OP
- Implicit OP
- Hybrid OP
- Config OP
"""
RESPONSE_TYPES_SUPPORTED = ("code", "id_token token", "id_token", "code id_token", "code id_token token", "code token")
class AuthorizeView(View):
# We need to be exempt from CSRF because the spec mandates that relying parties can send requests as POST.
# This is not a risk when we show a login form, because CSRF is pointless for a login form, if the attacker has
# the password, they don't need to resort to CSRF. We still to a minimal validation below.
# It would be a problem for a consent form, but we currently never show a consent form because it is not required
# for our intended use case where all relying parties are at least somewhat trusted.
@method_decorator(csrf_exempt)
@method_decorator(never_cache)
@method_decorator(sensitive_post_parameters())
def dispatch(self, request, *args, **kwargs):
if not request.organizer.settings.customer_accounts or not request.organizer.settings.customer_accounts_native:
raise Http404('Feature not enabled')
return super().dispatch(request, *args, **kwargs)
def get(self, request, *args, **kwargs):
return self._process_auth_request(request, request.GET)
def post(self, request, *args, **kwargs):
try:
CsrfViewMiddleware(lambda: None)._check_token(request)
except:
# External request, we prefer GET and will redirect to prevent confusion with our login form
return redirect_to_url(request.path + '?' + request.POST.urlencode())
return self._process_auth_request(request, request.GET)
def _final_error(self, error, error_description):
return HttpResponse(
f'Error: {error_description} ({error})',
status=400,
)
def _construct_redirect_uri(self, redirect_uri, response_mode, params):
ru = urlparse(redirect_uri)
qs = parse_qs(ru.query)
fm = parse_qs(ru.fragment)
if response_mode == 'query':
qs.update(params)
elif response_mode == 'fragment':
fm.update(params)
query = urlencode(qs, doseq=True)
fragment = urlencode(fm, doseq=True)
return urlunparse((ru.scheme, ru.netloc, ru.path, ru.params, query, fragment))
def _redirect_error(self, error, error_description, redirect_uri, response_mode, state):
qs = {'error': error, 'error_description': error_description}
if state:
qs['state'] = state
return redirect(
self._construct_redirect_uri(redirect_uri, response_mode, qs)
)
def _require_login(self, request, client, scope, redirect_uri, response_type, response_mode, state, nonce):
form = AuthenticationForm(data=request.POST if "login-email" in request.POST else None, request=request,
prefix="login")
if "login-email" in request.POST and form.is_valid():
customer_login(request, form.get_customer())
return self._success(client, scope, redirect_uri, response_type, response_mode, state, nonce, form.get_customer())
else:
return render(request, 'pretixpresale/organizers/customer_login.html', {
'providers': [],
'form': form,
})
def _success(self, client, scope, redirect_uri, response_type, response_mode, state, nonce, customer):
response_type = response_type.split(' ')
qs = {}
id_token_kwargs = {}
if 'code' in response_type:
grant = client.grants.create(
customer=customer,
scope=' '.join(scope),
redirect_uri=redirect_uri,
code=get_random_string(64),
expires=now() + timedelta(minutes=10),
auth_time=get_customer_auth_time(self.request),
nonce=nonce,
)
qs['code'] = grant.code
id_token_kwargs['with_code'] = grant.code
expires = now() + timedelta(hours=24)
if 'token' in response_type:
token = client.access_tokens.create(
customer=customer,
token=get_random_string(128),
expires=expires,
scope=' '.join(scope),
)
qs['access_token'] = token.token
qs['token_type'] = 'Bearer'
qs['expires_in'] = int((token.expires - now()).total_seconds())
id_token_kwargs['with_access_token'] = token.token
if 'id_token' in response_type:
qs['id_token'] = generate_id_token(
customer,
client,
get_customer_auth_time(self.request),
nonce,
' '.join(scope),
expires,
scope_claims='token' not in response_type and 'code' not in response_type,
**id_token_kwargs,
)
if state:
qs['state'] = state
r = redirect(self._construct_redirect_uri(redirect_uri, response_mode, qs))
r['Cache-Control'] = 'no-store'
r['Pragma'] = 'no-cache'
return r
def _process_auth_request(self, request, request_data):
response_mode = request_data.get("response_mode")
client_id = request_data.get("client_id")
state = request_data.get("state")
nonce = request_data.get("nonce")
max_age = request_data.get("max_age")
prompt = request_data.get("prompt")
response_type = request_data.get("response_type")
scope = request_data.get("scope", "").split(" ")
if not client_id:
return self._final_error("invalid_request", "client_id missing")
try:
client = self.request.organizer.sso_clients.get(is_active=True, client_id=client_id)
except CustomerSSOClient.DoesNotExist:
return self._final_error("unauthorized_client", "invalid client_id")
redirect_uri = request_data.get("redirect_uri")
if not redirect_uri or not client.allow_redirect_uri(redirect_uri):
return self._final_error("invalid_request_uri", "invalid redirect_uri")
if response_type not in RESPONSE_TYPES_SUPPORTED:
return self._final_error("unsupported_response_type", "response_type unsupported")
if response_type != "code" and response_mode == "query":
return self._final_error("invalid_request", "response_mode query must not be used with implicit or hybrid flow")
elif not response_mode:
response_mode = "query" if response_type == "code" else "fragment"
elif response_mode not in ("query", "fragment"):
return self._final_error("invalid_request", "invalid response_mode")
if "request" in request_data:
return self._redirect_error("request_not_supported", "request_not_supported", redirect_uri, response_mode, state)
if response_type not in ("code", "code token") and not nonce:
return self._redirect_error("invalid_request", "nonce is required in implicit or hybrid flow", redirect_uri,
response_mode, state)
if "openid" not in scope:
return self._redirect_error("invalid_scope", "scope 'openid' must be requested", redirect_uri,
response_mode, state)
if "id_token_hint" in request_data:
self._redirect_error("invalid_request", "id_token_hint currently not supported by this server",
redirect_uri, response_mode, state)
has_valid_session = bool(request.customer)
if has_valid_session and max_age:
try:
has_valid_session = int(time.time() - get_customer_auth_time(request)) < int(max_age)
except ValueError:
self._redirect_error("invalid_request", "invalid max_age value", redirect_uri, response_mode, state)
if not has_valid_session and prompt and prompt == "none":
return self._redirect_error("interaction_required", "user is not logged in but no prompt is allowed",
redirect_uri, response_mode, state)
elif prompt in ("select_account", "login"):
has_valid_session = False
if has_valid_session:
return self._success(client, scope, redirect_uri, response_type, response_mode, state, nonce, request.customer)
else:
return self._require_login(request, client, scope, redirect_uri, response_type, response_mode, state, nonce)
class TokenView(View):
@method_decorator(csrf_exempt)
@method_decorator(never_cache)
@method_decorator(sensitive_post_parameters())
def dispatch(self, request, *args, **kwargs):
if not request.organizer.settings.customer_accounts or not request.organizer.settings.customer_accounts_native:
raise Http404('Feature not enabled')
return super().dispatch(request, *args, **kwargs)
def post(self, request, *args, **kwargs):
auth_header = request.headers.get('Authorization')
if auth_header:
encoded_credentials = auth_header.split(' ')[1] # Removes "Basic " to isolate credentials
decoded_credentials = base64.b64decode(encoded_credentials).decode("utf-8").split(':')
client_id = decoded_credentials[0]
client_secret = decoded_credentials[1]
try:
self.client = request.organizer.sso_clients.get(client_id=client_id, is_active=True)
except CustomerSSOClient.DoesNotExist:
return JsonResponse({
"error": "invalid_client",
"error_description": "Unknown or inactive client_id"
}, status=401, headers={
'WWW-Authenticate': 'error="invalid_client"&error_description="Unknown or inactive client_id"'
})
if not self.client.check_client_secret(client_secret):
return JsonResponse({
"error": "invalid_client",
"error_description": "Wrong client_secret"
}, status=401, headers={
'WWW-Authenticate': 'error="invalid_client"&error_description="Wrong client_secret"'
})
elif request.POST.get("client_id"):
try:
self.client = request.organizer.sso_clients.get(client_id=request.POST["client_id"], is_active=True)
except CustomerSSOClient.DoesNotExist:
return JsonResponse({
"error": "invalid_client",
"error_description": "Unknown or inactive client_id"
}, status=400)
if "client_secret" in request.POST:
if not self.client.check_client_secret(request.POST.get("client_secret")):
return JsonResponse({
"error": "invalid_client",
"error_description": "Wrong client_secret"
}, status=401, headers={
'WWW-Authenticate': 'error="invalid_client"&error_description="Wrong client_secret"'
})
elif self.client.client_type != CustomerSSOClient.CLIENT_PUBLIC:
return JsonResponse({
"error": "invalid_client",
"error_description": "Client is confidential, authentication required"
}, status=400)
else:
return JsonResponse({
"error": "invalid_client",
"error_description": "Client is confidential, authentication required"
}, status=400)
grant_type = request.POST.get("grant_type")
if grant_type == "authorization_code":
return self._handle_authorization_code(request)
else:
return JsonResponse({
"error": "unsupported_grant_type"
}, status=400)
def _handle_authorization_code(self, request):
code = request.POST.get("code")
redirect_uri = request.POST.get("redirect_uri")
if not code:
return JsonResponse({
"error": "invalid_grant",
}, status=400)
try:
grant = self.client.grants.get(code=code, expires__gt=now())
except CustomerSSOGrant.DoesNotExist:
# The server must return an invalid_grant error as the authorization code has already been used.
# The originally issued access token should be revoked (as per RFC6749-4.1.2)
CustomerSSOAccessToken.objects.filter(
client=self.client,
from_code=code
).update(expires=now() - timedelta(seconds=1))
return JsonResponse({
"error": "invalid_grant",
"error_description": "Unknown or expired authorization code"
}, status=400)
if grant.redirect_uri != redirect_uri:
return JsonResponse({
"error": "invalid_grant",
"error_description": "Mismatch of redirect_uri"
}, status=400)
with transaction.atomic():
token = self.client.access_tokens.create(
customer=grant.customer,
token=get_random_string(128),
expires=now() + timedelta(hours=24),
scope=grant.scope,
from_code=code,
)
grant.delete()
return JsonResponse({
"access_token": token.token,
"token_type": "Bearer",
"expires_in": int((token.expires - now()).total_seconds()),
"id_token": generate_id_token(grant.customer, self.client, grant.auth_time, grant.nonce, grant.scope, token.expires)
}, headers={
'Cache-Control': 'no-store',
'Pragma': 'no-cache',
})
class UserInfoView(View):
@method_decorator(csrf_exempt)
@method_decorator(never_cache)
@method_decorator(sensitive_post_parameters())
def dispatch(self, request, *args, **kwargs):
if not request.organizer.settings.customer_accounts or not request.organizer.settings.customer_accounts_native:
raise Http404('Feature not enabled')
auth_header = request.headers.get('Authorization')
if auth_header:
method, token = auth_header.split(' ', 1)
if method != 'Bearer':
return JsonResponse({
"error": "invalid_request",
"error_description": "Unknown authorization method"
}, status=400, headers={
'Access-Control-Allow-Origin': '*',
})
elif request.method == "POST" and "access_token" in request.POST:
token = request.POST.get("access_token")
else:
return HttpResponse(status=401, headers={
'WWW-Authenticate': 'Bearer realm="example"',
'Access-Control-Allow-Origin': '*',
})
try:
access_token = CustomerSSOAccessToken.objects.get(
token=token, expires__gt=now(), client__organizer=self.request.organizer,
)
except CustomerSSOAccessToken.DoesNotExist:
return JsonResponse({
"error": "invalid_token",
"error_description": "Unknown access token"
}, status=401, headers={
'WWW-Authenticate': 'error="invalid_token"&error_description="Unknown access token"',
'Access-Control-Allow-Origin': '*',
})
else:
self.customer = access_token.customer
self.access_token = access_token
r = super().dispatch(request, *args, **kwargs)
r['Access-Control-Allow-Origin'] = '*'
return r
def post(self, request, *args, **kwargs):
return self._handle(request)
def get(self, request, *args, **kwargs):
return self._handle(request)
def _handle(self, request):
return JsonResponse(customer_claims(self.customer, self.access_token.client.evaluated_scope(self.access_token.scope)))
class KeysView(View):
def dispatch(self, request, *args, **kwargs):
if not request.organizer.settings.customer_accounts or not request.organizer.settings.customer_accounts_native:
raise Http404('Feature not enabled')
r = super().dispatch(request, *args, **kwargs)
r['Access-Control-Allow-Origin'] = '*'
return r
def _encode_int(self, i):
hexi = hex(i)[2:]
return base64.urlsafe_b64encode(unhexlify((len(hexi) % 2) * '0' + hexi))
def get(self, request, *args, **kwargs):
privkey, pubkey = _get_or_create_server_keypair(request.organizer)
kid = hashlib.sha256(pubkey.encode()).hexdigest()[:16]
pubkey = RSA.import_key(pubkey)
return JsonResponse({
'keys': [
{
'kty': 'RSA',
'alg': 'RS256',
'kid': kid,
'use': 'sig',
'e': self._encode_int(pubkey.e).decode().rstrip("="),
'n': self._encode_int(pubkey.n).decode().rstrip("="),
}
]
})
class ConfigurationView(View):
def dispatch(self, request, *args, **kwargs):
if not request.organizer.settings.customer_accounts or not request.organizer.settings.customer_accounts_native:
raise Http404('Feature not enabled')
r = super().dispatch(request, *args, **kwargs)
r['Access-Control-Allow-Origin'] = '*'
return r
def get(self, request, *args, **kwargs):
return JsonResponse({
'issuer': build_absolute_uri(request.organizer, 'presale:organizer.index').rstrip('/'),
'authorization_endpoint': build_absolute_uri(
request.organizer, 'presale:organizer.oauth2.v1.authorize'
),
'token_endpoint': build_absolute_uri(
request.organizer, 'presale:organizer.oauth2.v1.token'
),
'userinfo_endpoint': build_absolute_uri(
request.organizer, 'presale:organizer.oauth2.v1.userinfo'
),
'jwks_uri': build_absolute_uri(
request.organizer, 'presale:organizer.oauth2.v1.jwks'
),
'scopes_supported': [k for k, v in CustomerSSOClient.SCOPE_CHOICES],
'response_types_supported': RESPONSE_TYPES_SUPPORTED,
'response_modes_supported': ['query', 'fragment'],
'request_parameter_supported': False,
'grant_types_supported': ['authorization_code', 'implicit'],
'subject_types_supported': ['public'],
'id_token_signing_alg_values_supported': ['RS256'],
'token_endpoint_auth_methods_supported': [
'client_secret_post', 'client_secret_basic'
],
'claims_supported': [
'iss',
'aud',
'exp',
'iat',
'auth_time',
'nonce',
'c_hash',
'at_hash',
'sub',
'locale',
'name',
'given_name',
'family_name',
'middle_name',
'nickname',
'email',
'email_verified',
'phone_number',
],
'request_uri_parameter_supported': False,
})
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