Odd problem with Incorrect padding error in Oauth2 flow using Django >=2.0

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Malcolm MacKinnon

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Jun 10, 2018, 10:12:52 PM6/10/18

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Using python 3.55 and django 1.10 in my Oauth2 flow (with django_openid_auth in my installed apps),

my code executes without any errors. But in a python 3.55 and django >=2.0 environment, I get the following error:

Error at /openid/login/

Incorrect padding

I've spent two days searching for what's causing this and haven't found anything. There is some discussion here:

https://github.com/WeblateOrg/weblate/issues/1799

and here:

https://bugs.python.org/issue33770

But, I haven't found a solution. Does anyone know the reason why this is happening or have a solution?

Here's my traceback:

Internal Server Error: /openid/login/

Traceback (most recent call last):

File "/home/malcolm/anaconda3/envs/qb6/lib/python3.5/site-packages/django/core/handlers/exception.py", line 35, in inner

response = get_response(request)

File "/home/malcolm/anaconda3/envs/qb6/lib/python3.5/site-packages/django/core/handlers/base.py", line 128, in _get_response

response = self.process_exception_by_middleware(e, request)

File "/home/malcolm/anaconda3/envs/qb6/lib/python3.5/site-packages/django/core/handlers/base.py", line 126, in _get_response

response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "/home/malcolm/qb6/qb5/django_openid_auth/views.py", line 191, in login_begin

openid_request = consumer.begin(openid_url)

File "/home/malcolm/anaconda3/envs/qb6/lib/python3.5/site-packages/openid/consumer/consumer.py", line 359, in begin

return self.beginWithoutDiscovery(service, anonymous)

File "/home/malcolm/anaconda3/envs/qb6/lib/python3.5/site-packages/openid/consumer/consumer.py", line 382, in beginWithoutDiscovery

auth_req = self.consumer.begin(service)

File "/home/malcolm/anaconda3/envs/qb6/lib/python3.5/site-packages/openid/consumer/consumer.py", line 610, in begin

assoc = self._getAssociation(service_endpoint)

File "/home/malcolm/anaconda3/envs/qb6/lib/python3.5/site-packages/openid/consumer/consumer.py", line 1178, in _getAssociation

assoc = self.store.getAssociation(endpoint.server_url)

File "/home/malcolm/qb6/qb5/django_openid_auth/store.py", line 80, in getAssociation

base64.decodestring(assoc.secret.encode('utf-8')),

File "/home/malcolm/anaconda3/envs/qb6/lib/python3.5/base64.py", line 562, in decodestring

return decodebytes(s)

File "/home/malcolm/anaconda3/envs/qb6/lib/python3.5/base64.py", line 554, in decodebytes

return binascii.a2b_base64(s)

binascii.Error: Incorrect padding

ERROR:django.request:Internal Server Error: /openid/login/