Cryptography: AttributeError: cffi library '_openssl' has no function, constant or global variable named 'Cryptography_HAS_CMS'

[MagTun]

I was using cryptography 2.2.2 and got this error.
AttributeError: cffi library '_openssl' has no function, constant or global variable named 'Cryptography_HAS_CMS'

I downgraded to cryptography 2.2.1 and I don't have the error anymore.

Here is the full error report:

    from oauth2client import client, tools
  File "C:\Users\user\AppData\Local\Programs\Python\Python36\lib\site-packages\oauth2client\client.py", line 45, in <module>
    from oauth2client import crypt
  File "C:\Users\user\AppData\Local\Programs\Python\Python36\lib\site-packages\oauth2client\crypt.py", line 45, in <module>
    from oauth2client import _openssl_crypt
  File "C:\Users\user\AppData\Local\Programs\Python\Python36\lib\site-packages\oauth2client\_openssl_crypt.py", line 16, in <module>
    from OpenSSL import crypto
  File "C:\Users\user\AppData\Local\Programs\Python\Python36\lib\site-packages\OpenSSL\__init__.py", line 8, in <module>
    from OpenSSL import crypto, SSL
  File "C:\Users\user\AppData\Local\Programs\Python\Python36\lib\site-packages\OpenSSL\crypto.py", line 16, in <module>
    from OpenSSL._util import (
  File "C:\Users\user\AppData\Local\Programs\Python\Python36\lib\site-packages\OpenSSL\_util.py", line 6, in <module>
    from cryptography.hazmat.bindings.openssl.binding import Binding
  File "C:\Users\user\AppData\Local\Programs\Python\Python36\lib\site-packages\cryptography\hazmat\bindings\openssl\binding.py", line 156, in <module>
    Binding.init_static_locks()
  File "C:\Users\user\AppData\Local\Programs\Python\Python36\lib\site-packages\cryptography\hazmat\bindings\openssl\binding.py", line 137, in init_static_locks
    cls._ensure_ffi_initialized()
  File "C:\Users\user\AppData\Local\Programs\Python\Python36\lib\site-packages\cryptography\hazmat\bindings\openssl\binding.py", line 124, in _ensure_ffi_initialized
    cls.lib = build_conditional_library(lib, CONDITIONAL_NAuserS)
  File "C:\Users\user\AppData\Local\Programs\Python\Python36\lib\site-packages\cryptography\hazmat\bindings\openssl\binding.py", line 84, in build_conditional_library
    if not getattr(lib, condition):
AttributeError: cffi library '_openssl' has no function, constant or global variable named 'Cryptography_HAS_CMS'

• Versions of:
• Python==3.6.5,
• cryptography==2.2.2
• cffi==1.11.5,
• pip==9.0.3`
• setuptools: not installed

[alex]

Can you try uninstalling cryptography and reinstalling? It looks like somehow you've got a .so and a Python library of differeing versions.

[MagTun]

I have uninstalled cryptography and reinstalled it as you asked. The version I have now is 2.2.2 and I don't get the error anymore. So it may be what you suggested.

Sorry for opening an issue for that.

[Allan-Nava]

I got this error:

 File "/home/ies/.local/lib/python3.5/site-packages/cryptography/hazmat/bindings/openssl/binding.py", line 85, in build_conditional_library
    if not getattr(lib, condition):
AttributeError: cffi library '_openssl' has no function, constant or global variable named 'Cryptography_HAS_GENERIC_DTLS_METHOD'

[harsh23tyagi]

@Allan-Nava uninstall cryptography bundle and reinstall it. There is a conflict somewhere, you might be using some more than one libraries with different versions of cryptography. Its better to use conda for separate versions.

[Allan-Nava]

@harsh23tyagi I solved with specific version of openssl etc, thanks!

[thirumalalagur]

I have found a solution as uninstall openssl or azure library, restart cluster and install it again, but restarting cluster may not be possible because it may need to handle longer tasks, etc.

[kikoreis]

See https://github.com/certbot/certbot/issues/5651#issuecomment-497913724