lxml 4.7.x results in "A valid SubjectConfirmation was not found on this Response" with ADFS #292

aquatix · 2021-12-21T09:50:31Z

We recently upgraded our lxml from 4.6.4 to 4.7.1 and suddenly there were some SSO issues:

OneLogin works fine, but when a client logs in from an ADFS instance, they get the message that "A valid SubjectConfirmation was not found on this Response".

Moving back to 4.6.4 resolves this issue.

The configuration:

        return {
            'strict': True,
            'debug': True,
            'sp': {
                'entityId': f'{servername}/saml/metadata/{self.logincode}',
                'assertionConsumerService': {
                    'url': f'{servername}/saml/acs/{self.logincode}',
                    'binding': 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST',
                },
                'singleLogoutService': {
                    'url': f'{servername}/saml/sls/{self.logincode}',
                    'binding': 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect',
                },
                'NameIDFormat': 'urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified',
                'x509cert': '',
                'privateKey': '',
            },
            'idp': {
                'entityId': self.idprovider_entity_id,
                'singleSignOnService': {
                    'url': self.idprovider_url,
                    'binding': 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect',
                },
                'singleLogoutService': {
                    'url': self.idprovider_url,  # TODO: add SLO url property
                    'binding': 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect',
                },
                'x509cert': self.x509certificate,
            },
            'security':
            {
                'signatureAlgorithm': 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha256',
                'digestAlgorithm': 'http://www.w3.org/2001/04/xmlenc#sha256',
                'requestedAuthnContext': False,
            },
        }

memocong · 2021-12-29T13:51:38Z

Encountered the same issue and it only happens when the SAMLResponse is encrypted.
The issue can be mitigated by patching the code:

from onelogin.saml2.xmlparser import tostring, fromstring
self.decrypted_document = fromstring(tostring(self.decrypted_document))

Reproduced the issue with the code in demo-django and dockerfile added (reference this repo)

folder structure

demo-django
├── Dockerfile
├── demo
│   ├── __init__.py
│   ├── settings.py
│   ├── urls.py
│   ├── views.py
│   └── wsgi.py
├── docker-compose.yml
├── manage.py
├── requirements.txt
├── saml
│   ├── advanced_settings.json
│   ├── certs
│   │   ├── README
│   │   ├── sp.crt
│   │   └── sp.key
│   └── settings.json
└── templates
    ├── attrs.html
    ├── base.html
    └── index.html

Dockerfile

FROM python:3.8

RUN apt-get update && apt-get install -y \
    libffi-dev libxmlsec1-dev libxmlsec1-openssl xmlsec1

ADD . /code
WORKDIR /code

ADD requirements.txt /requirements.txt
RUN pip install -r /requirements.txt

requirements.txt

Django==3.2
python3-saml

docker-compose.yml

version: '3'

services:
  web:
    restart: always
    build: .
    command: sh -c "python manage.py runserver 0.0.0.0:9000"
    volumes:
      - .:/code
    ports:
      - "9000:9000"

installed packages

Package      Version
------------ -------
asgiref      3.4.1
Django       3.2
isodate      0.6.1
lxml         4.7.1
pip          21.2.4
python3-saml 1.12.0
pytz         2021.3
setuptools   57.5.0
six          1.16.0
sqlparse     0.4.2
wheel        0.37.0
xmlsec       1.3.12

nijel · 2022-01-14T10:26:52Z

This issue is also exposed in the python-social-auth testsuite, see python-social-auth/social-core#653

nijel · 2022-01-14T10:50:09Z

I've tried workaround mentioned by @memocong in #292 (comment), and it does somewhat improve the situation, but still is not 100% reliable (without the workaround I get nearly 100% fail rate, with the workaround it is down to something like 20%).

Just for the reference, the workaround patch I've tried:

--- .venv/lib/python3.9/site-packages/onelogin/saml2/response.py.orig	2022-01-14 11:36:50.176430928 +0100
+++ .venv/lib/python3.9/site-packages/onelogin/saml2/response.py	2022-01-14 11:36:53.344432690 +0100
@@ -47,6 +47,8 @@
             decrypted_document = deepcopy(self.document)
             self.encrypted = True
             self.decrypted_document = self.__decrypt_assertion(decrypted_document)
+            from onelogin.saml2.xmlparser import tostring, fromstring
+            self.decrypted_document = fromstring(tostring(self.decrypted_document))
 
     def is_valid(self, request_data, request_id=None, raise_exceptions=False):
         """

To me it seems like there is some memory corruption going on inside lxml inside __decrypt_assertion.

Also, sometimes this fails with tons of namespace errors:

namespace error : Namespace prefix saml2 on Attribute is not defined
1.4.1.5923.1.1.1.1" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
                                                                               ^
namespace error : Namespace prefix xmlns for xsi on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix xsi for type on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix xmlns for xsi on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix xsi for type on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on Attribute is not defined
1.4.1.5923.1.1.1.6" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
                                                                               ^
namespace error : Namespace prefix xmlns for xsi on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix xsi for type on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on Attribute is not defined
e="urn:oid:2.5.4.4" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
                                                                               ^
namespace error : Namespace prefix xmlns for xsi on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix xsi for type on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on Attribute is not defined
1.4.1.5923.1.1.1.9" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
                                                                               ^
namespace error : Namespace prefix xmlns for xsi on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix xsi for type on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix xmlns for xsi on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix xsi for type on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on Attribute is not defined
="urn:oid:2.5.4.42" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
                                                                               ^
namespace error : Namespace prefix xmlns for xsi on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix xsi for type on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on Attribute is not defined
1.4.1.5923.1.1.1.7" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
                                                                               ^
namespace error : Namespace prefix xmlns for xsi on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix xsi for type on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on Attribute is not defined
e="urn:oid:2.5.4.3" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
                                                                               ^
namespace error : Namespace prefix xmlns for xsi on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix xsi for type on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on Attribute is not defined
.4.1.5923.1.1.1.10" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
                                                                               ^
namespace error : Namespace prefix saml2 on AttributeValue is not defined
meFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri"><saml2:AttributeValue
                                                                               ^
namespace error : Namespace prefix saml2 on NameID is not defined
ibboleth" SPNameQualifier="https://github.com/omab/python-social-auth/saml-test"
                                                                               ^
namespace error : Namespace prefix saml2 on Attribute is not defined
="urn:oid:2.5.4.20" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:uri"
                                                                               ^
namespace error : Namespace prefix xmlns for xsi on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix xsi for type on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^
namespace error : Namespace prefix saml2 on AttributeValue is not defined
Value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="xs:string"
                                                                               ^

… inside a encrypted element is validated. See SAML-Toolkits/python3-saml#292 Also reverted dm.xmlsec.binding to 1.3.7

… inside a encrypted element is validated. See #292

mredaelli · 2022-04-28T08:57:01Z

Has it been determined if this is an lxml regression (as I assume it is), or if this needs to be addressed here?

If the former, does anyone have a link to an issue on lxml's bug tracker?

MattiasLevlin · 2022-05-05T13:34:27Z

Encountered the same "SubjectConfirmation" issue in our SSO solution, which utilizes python3-saml. Downgrading lxml from 4.7.0 to 4.6.4 seems to have solved the issue.

https://github.com/CSCfi/fairdata-sso/releases/tag/1.2.1

See SAML-Toolkits/python3-saml#292

AvnerCohen · 2022-05-19T12:34:13Z

~~My guess is that this was in issue in the 4.7.0, this version is yanked and is already fixed in 4.7.1~~
~~The change log has: https://lxml.de/4.7/changes-4.7.1.html~~
~~That points to this thread -https://mail.python.org/archives/list/[email protected]/thread/6ZFBHFOVHOS5GFDOAMPCT6HM5HZPWQ4Q/~~

~~And has been fixed in 4.7.1 if I get this right.~~

nijel · 2022-05-19T12:50:07Z

No, it is broken in 4.7.1 and 4.8.0 as well (4.6.5 works fine). The 4.7.0 had an issue that it did not include all files in the release, that's why it's yanked.

AvnerCohen · 2022-05-19T12:56:09Z

Oh, I see thanks for the clarification! I'll be be updating my comment to avoid confusing people then..

mredaelli · 2022-05-19T13:09:13Z

No, it is broken in 4.7.1 and 4.8.0 as well (4.6.5 works fine). The 4.7.0 had an issue that it did not include all files in the release, that's why it's yanked.

Then let me ask again: do we know if they know they have a bug? Did someone open an issue somewhere?

AvnerCohen · 2022-05-19T13:33:25Z

@mredaelli list of open lxml bugs are here - https://bugs.launchpad.net/lxml
I think that to be able to check if the bug is open, we need to better understand what is the root cause here, on the lxml level. I don't think I see in this thread anything like that.

nijel · 2022-06-01T11:40:39Z

I've just verified it happens in 4.9.0 as well. But it seems to happen only with the binary wheels, if I build lxml from the source, it works correctly. Can somebody else confirm such behavior? (I'm testing using python-social-auth testsuite, and it does not trigger the bug in 100%, so there is always some estimation). You can install from the source using pip install --force-reinstall --no-binary :all: lxml==4.9.0

Looking at lxml bugs, this one might be the one we're hitting: https://bugs.launchpad.net/lxml/+bug/1960668

This might be a workaround for SAML-Toolkits/python3-saml#292

SilviaAmAm · 2022-07-07T13:11:18Z

I'm wondering if there is any resolution in sight for this issue? lxml has released version 4.9.1 which resolves a vulnerability issue, but this issue blocks the upgrade of projects using python3-saml 🙁

AndrewGrossman · 2022-07-07T14:50:18Z

I'm wondering if there is any resolution in sight for this issue? lxml has released version 4.9.1 which resolves a vulnerability issue, but this issue blocks the upgrade of projects using python3-saml 🙁

+1

Recent python3-saml versions block lxml upgrade, which in turn contains security fixes for GHSA-wrxv-2j5q-m38w. The version restriction seems to be caused by binary wheel not compatible with some distros (see SAML-Toolkits/python3-saml#292). As we build lxml from the source, we're not affected by this. Once python3-saml raises the restriction (for example by SAML-Toolkits/python3-saml#309), we can switch back to the latest version.

bofeng · 2022-09-15T12:53:25Z

I am having the same issue here, however, without changing any source code, this solved my issue:

$ pip uninstall lxml
$ pip install --no-binary lxml lxml==4.7.0

nosnilmot · 2022-09-15T16:04:18Z

I am having the same issue here, however, without changing any source code, this solved my issue:
$ pip uninstall lxml
$ pip install --no-binary lxml lxml==4.7.0

yes, that works, but you would be better to install lxml==4.9.1

https://bugs.launchpad.net/lxml/+bug/1960668 is the canonical upstream lxml bug report. It still isn't clear if this is solvable with code changes in one or more of lxml, xmlsec and libxml2, or if the above is the correct long-term solution to ensure xmlsec and lxml are using the same version of libxml2.

This is in preparation to upgrading python3-saml and then lxml to their latest versions. lxml breaks on some edge cases becaues it was statically built against a different libxml2 than *other* xml-based tooling using at runtime ( because that's dynamically linked), causing some tree lookups to fail. * python3-saml issue: SAML-Toolkits/python3-saml#292 * upstream bug: https://bugs.launchpad.net/lxml/+bug/1960668

… built against old libxml2 This fixes PowerDNS-Admin#1442 and closes PowerDNS-Admin#1433. The issue with python3-saml not working is because the binary lxml wheel is built against a different version of libxml2. ``--no-binary lxml`` can be used to fix this and python3-saml will work. for references check these: - SAML-Toolkits/python3-saml#292 - https://bugs.launchpad.net/lxml/+bug/1960668 - open-formulieren/open-forms#2247

… built against old libxml2 This fixes PowerDNS-Admin#1442 and closes PowerDNS-Admin#1433. The issue with python3-saml not working is because the binary lxml wheel is built against a different version of libxml2. ``--no-binary lxml`` can be used to fix this and python3-saml will work. for references check these: - SAML-Toolkits/python3-saml#292 - https://bugs.launchpad.net/lxml/+bug/1960668 - open-formulieren/open-forms#2247 ``` Tested on: - ubuntu:23.04 - WORKING - ubuntu:22.10 - WORKING - ubuntu:22.04 - WORKING - ubuntu:20.04 - WORKING - ubuntu:18.04 - NOT WORKING - pip usage error with -r requirements.txt - debian:10 - WORKING - debian:11 - WORKING - alpine:edge - WORKING - alpine:3.17 - WORKING - alpine:3.16 - WORKING - alpine:3.15 - WORKING - alpine:3.14 - WORKING - rockylinux:9 - WORKING - rockylinux:8 - NOT WORKING - pip usage error with -r requirements.txt - almalinux:9 - WORKING - almalinux:8 - NOT WORKING - pip usage error with -r requirements.txt - fedora:36 - WORKING - fedora:37 - WORKING - fedora:38 - WORKING - fedora:39 - WORKING ```

Fixes Python 3.11 incompatibility using ancient lxml binary PyPI built against old libxml2. This fixes PowerDNS-Admin#1442 and closes PowerDNS-Admin#1433. The issue with python3-saml not working is because the binary lxml wheel is built against a different version of libxml2. ``--no-binary lxml`` can be used to fix this and python3-saml will work. for references check these: - SAML-Toolkits/python3-saml#292 - https://bugs.launchpad.net/lxml/+bug/1960668 - open-formulieren/open-forms#2247 ``` Tested on: - ubuntu:23.04 - WORKING - ubuntu:22.10 - WORKING - ubuntu:22.04 - WORKING - ubuntu:20.04 - WORKING - ubuntu:18.04 - NOT WORKING - pip usage error with -r requirements.txt - debian:10 - WORKING - debian:11 - WORKING - alpine:edge - WORKING - alpine:3.17 - WORKING - alpine:3.16 - WORKING - alpine:3.15 - WORKING - alpine:3.14 - WORKING - rockylinux:9 - WORKING - rockylinux:8 - NOT WORKING - pip usage error with -r requirements.txt - almalinux:9 - WORKING - almalinux:8 - NOT WORKING - pip usage error with -r requirements.txt - fedora:36 - WORKING - fedora:37 - WORKING - fedora:38 - WORKING - fedora:39 - WORKING ```

Release 4.4 of python social auth upgrades the lxml packages and seemd to be not compatible with our code. The issue we have is similar to this issue: SAML-Toolkits/python3-saml#292 In a first time we decided to downgrade python social auth to a known working version.

jeffsawatzky · 2023-08-17T14:57:06Z

For those of you installing python3-saml using a requirements.txt file, try doing something like this:

--no-binary lxml
# other deps
python3-saml
# more deps

KOliver94 mentioned this issue Jan 14, 2022

Fix unstable SAML test python-social-auth/social-core#653

Merged

10 tasks

pitbulk added a commit to SAML-Toolkits/python-saml that referenced this issue Jan 28, 2022

Fixing lxml to 4.7.0, it seems 4.7.1 had conflicts when the signature…

9106605

… inside a encrypted element is validated. See SAML-Toolkits/python3-saml#292 Also reverted dm.xmlsec.binding to 1.3.7

pitbulk added a commit that referenced this issue Jan 28, 2022

Fixing lxml to 4.7.0, it seems 4.7.1 had conflicts when the signature…

a55cc9a

… inside a encrypted element is validated. See #292

nijel mentioned this issue Jan 30, 2022

Why is lxml restricted to specific versions? python-social-auth/social-core#659

Closed

akx mentioned this issue Jan 31, 2022

Don't require yanked version of lxml #297

Merged

nijel added a commit to WeblateOrg/docker that referenced this issue May 10, 2022

deps: Lower lxml dependency to avoid crashes inside SAML

0782f58

See SAML-Toolkits/python3-saml#292

nijel added a commit to nijel/docker that referenced this issue Jun 7, 2022

deps: Build lxml from the source

403c38f

This might be a workaround for SAML-Toolkits/python3-saml#292

nijel mentioned this issue Jul 15, 2022

build: bringing lxml latest version. #309

Closed

nijel mentioned this issue Jul 18, 2022

build(deps): bump python3-saml from 1.12.0 to 1.14.0 WeblateOrg/docker#1556

Closed

nosnilmot mentioned this issue Aug 30, 2022

Remove lxml version restriction #323

Merged

bofeng mentioned this issue Sep 15, 2022

scn.find doensn't work on debina #302

Closed

sergei-maertens mentioned this issue Oct 26, 2022

📌 Pin lxml to not use binary wheels open-formulieren/open-forms#2247

Merged

mredaelli mentioned this issue Oct 26, 2022

allow overriding/forcing a certain version jazzband/pip-tools#215

Open

nijel mentioned this issue Dec 8, 2022

chore(deps): update dependency python3-saml to v1.15.0 WeblateOrg/docker#1669

Merged

1 task

pitbulk added help wanted informative resolved labels Dec 25, 2022

nijel mentioned this issue Mar 2, 2023

PEP621: Migrate setup.py config into pyproject.toml python-social-auth/social-core#770

Closed

10 tasks

nkukard mentioned this issue Mar 12, 2023

Update lxml version to support python3.11 PowerDNS-Admin/PowerDNS-Admin#1433

Closed

nkukard mentioned this issue Mar 14, 2023

Upgrade lxml & python3-saml dependencies with workaround PowerDNS-Admin/PowerDNS-Admin#1451

Merged

lunika mentioned this issue Apr 20, 2023

⬇️(back) downgrade python social auth to version 4.3.0 openfun/marsha#2197

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lxml 4.7.x results in "A valid SubjectConfirmation was not found on this Response" with ADFS #292

lxml 4.7.x results in "A valid SubjectConfirmation was not found on this Response" with ADFS #292

aquatix commented Dec 21, 2021

memocong commented Dec 29, 2021 •

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nijel commented Jan 14, 2022

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mredaelli commented Apr 28, 2022

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nijel commented May 19, 2022

AvnerCohen commented May 19, 2022

mredaelli commented May 19, 2022

AvnerCohen commented May 19, 2022

nijel commented Jun 1, 2022

SilviaAmAm commented Jul 7, 2022

AndrewGrossman commented Jul 7, 2022

bofeng commented Sep 15, 2022

nosnilmot commented Sep 15, 2022

jeffsawatzky commented Aug 17, 2023

lxml 4.7.x results in "A valid SubjectConfirmation was not found on this Response" with ADFS #292

lxml 4.7.x results in "A valid SubjectConfirmation was not found on this Response" with ADFS #292

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aquatix commented Dec 21, 2021

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