Bug 1489816

I see there are some calls to SSL_CTX_set_cipher_list() at Modules/_ssl.c

Christian would you be able to shed some light here?

SSL_CTX_set_cipher_list() is called in two places. First of all it is used in the constructor of SSLContext to block unsafe ciphers with old versions of OpenSSL. It is also called by SSLContext.set_ciphers() in ssl.create_default_context(). You have to patch both calls to use system policies.

In order to avoid using a downstream-only string (PROFILE=SYSTEM), you may want to not call these functions at all, unless the caller has explicitly specified a string. Not calling the set_ciphers() in openssl, means using the default ciphers.

I opened upstream bug https://bugs.python.org/issue31429 to address the issue. While Python won't drop the cipher suite override any time soon, I'll try to get a configure option and macro in:

    ./configure --with-ssl-default-suite="PROFILE=SYSTEM"
    make

Thanks Christian for looking into it.

Nikos for which branches of Fedora should this be addressed and is there any related deadline? Currently I'm still catching up with things due to a long vacation, so it might take some time until I get to it.

Current WIP PR from cheimes:

https://github.com/python/cpython/pull/3532

I backported the PR to python 3.6.2 and created a scratch build and it builds fine on rawhide with using the "PROFILE=SYSTEM" string[0].

[0] https://koji.fedoraproject.org/koji/taskinfo?taskID=22087475

Upstream has merged the PR for the 3.7 branch. I will backport it to our 3.6 package as it's backwards compatible.

Thank you!

python3-3.6.4-7.fc27 has been submitted as an update to Fedora 27. https://bodhi.fedoraproject.org/updates/FEDORA-2018-0910fcb732

python3-3.6.4-7.fc27 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-0910fcb732

python3-3.6.4-7.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.

python3-3.6.4-17.fc29, rpmlint:

python3-debug.x86_64: W: crypto-policy-non-compliance-openssl /usr/lib64/python3.6/lib-dynload/_ssl.cpython-36dm-x86_64-linux-gnu.so SSL_CTX_set_cipher_list
python3-libs.x86_64: W: crypto-policy-non-compliance-openssl /usr/lib64/python3.6/lib-dynload/_ssl.cpython-36m-x86_64-linux-gnu.so SSL_CTX_set_cipher_list

Looking at https://src.fedoraproject.org/rpms/python3/c/c9bb114a1dc3fc2216af482d1cdbafe58db45afb?branch=master

I don't see --with-ssl-default-suite="PROFILE=SYSTEM"

Ignore the last comment.

The fix is actually https://src.fedoraproject.org/rpms/python3/c/969d51434e2479639d62c2b03fd51df7403eb722?branch=master

That has --with-ssl-default-suites=openssl, not --with-ssl-default-suite="PROFILE=SYSTEM".

Apparently, rpmlint does something like this:

$ readelf -W -S -l -d -s /usr/lib64/python3.6/lib-dynload/_ssl.cpython-36m-x86_64-linux-gnu.so | grep SSL_CTX_set_cipher_list | grep -v 'PROFILE=SYSTEM'
    17: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND SSL_CTX_set_cipher_list@OPENSSL_1_1_0 (2)

Reassigning to rpmlint as this is not a bug in python but an erroneous reporting of rpmlint.

rpmlint matches https://fedoraproject.org/wiki/Packaging:CryptoPolicies

If that is incorrect, it should be adjusted (and rpmlint will match it).

This bug appears to have been reported against 'rawhide' during the Fedora 29 development cycle.
Changing version to '29'.

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