AttributeError: module 'lib' has no attribute 'X509_V_FLAG_CB_ISSUER_CHECK' about stomp.py

[jertel]

Some good news.. The pyca team released cryptography 37.0.1 which restored the symbol that this older PyOpenSSL package uses. They will be removing it again soon, so they still advise projects to upgrade to the latest PyOpenSSL lib. But for now we can continue using the Stomp 8.0.0 package.

[johan-westin-private]

My workaround is to pin cryptography==36.0.2

[jasonrbriggs]

I've changed the code to use x509 from the cryptography module itself, and removed the dependency on PyOpenSSL. Added bonus... code is ever-so-slightly clean as well.

Version 8.0.1: https://pypi.org/project/stomp.py/8.0.1/

[johan-westin-private]

Great news, thank you very much!

[johan-westin-private]

OS: CentOS Linux release 7.9.2009
Linux kernel: 3.10.0-1160.24.1.el7.x86_64
OpenSSL: 1.1
Python: 3.7.2 (build with GCC 8.2.0)

[jertel]

On Feb 16, an issue was created, requesting to upgrade to PyOpenSSL 22.0: #371

Later that day this commit was pushed, effectively upgrading PyOpenSSL to 22.0: 000de5e

Based on that it appears the code base is ready to go, and now we're waiting for a new pip package release.

However, it might be better to remove the dependency on PyOpenSSL altogether, and switch stomp/transport.py:56 to use the cryptography package directly to load the certificate. PyOpenSSL is not recommended for use at this point.

[eisraeli]

I've encountered the same issue... Following...

../../../.local/share/virtualenvs/p/lib/python3.9/site-packages/stomp/init.py:13: in
import stomp.connect as connect
../../../.local/share/virtualenvs/p/lib/python3.9/site-packages/stomp/connect.py:9: in
from stomp.transport import *
../../../.local/share/virtualenvs/p/lib/python3.9/site-packages/stomp/transport.py:38: in
import OpenSSL
../../../.local/share/virtualenvs/p/lib/python3.9/site-packages/OpenSSL/init.py:8: in
from OpenSSL import crypto, SSL
../../../.local/share/virtualenvs/p/lib/python3.9/site-packages/OpenSSL/crypto.py:1556: in
class X509StoreFlags(object):
../../../.local/share/virtualenvs/p/lib/python3.9/site-packages/OpenSSL/crypto.py:1577: in X509StoreFlags
CB_ISSUER_CHECK = _lib.X509_V_FLAG_CB_ISSUER_CHECK
E AttributeError: module 'lib' has no attribute 'X509_V_FLAG_CB_ISSUER_CHECK'