[Cryptography-dev] v1.4: _openssl has no Cryptography_STATIC_CALLBACKS

[Paul Kehrer]

This is likely to be something related to anaconda, but I'm not sure how to
go about debugging exactly why you're seeing this occur. It *looks* like
it's attempting to load an old _openssl.so with a new cryptography.

-Paul

On August 23, 2016 at 12:58:20 PM, Robin Fishbein via Cryptography-dev (
cryptography-dev at python.org) wrote:

Hello,



I imagine this may have a trivial explanation, or perhaps indicate some
quirk on my machine, but it looks as though some desired functionality
isn’t available on my machine with version 1.4. I wanted to share this in
case it indicates some wider issue of interest, and helps me learn a little
about how cryptography works under the hood.



Windows 7, 64-bit, Python 3.5.1, and I believe OpenSSL 1.0.2. I use paramiko
for SFTP, and when updating paramiko (on a whim) to 2.0.2 with Anaconda, it
had me update cryptography as well, to version 1.4, or maybe it was 1.3 at
first — either one experiences the issue. When attempting an SSH connect, I
get a traceback ending with this:



File
"C:\Users\...\AppData\Local\Continuum\Anaconda3\lib\site-packages\cryptography\hazmat\bindings\openssl\binding.py",
line 73, in wrapper

    if lib.Cryptography_STATIC_CALLBACKS:



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



When I manually carry out some of the imports in the source...

from cryptography.hazmat.bindings._openssl import ffi, lib

...and then look at what auto-complete shows for lib, I don’t see
Cryptography_STATIC_CALLBACKS, which is consistent with the AttributeError.
I don’t yet understand where to look for the source underneath the
bootstrapped _openssl.*.pyd file.



The SSH connection and all subsequent functionality work fine with the
latest versions of paramiko and cffi as long as I revert cryptography to
1.0.2.



-Robin Fishbein


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