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Bug 1250611 - SSLContext.load_cert_chain() keyfile argument can't be set to None
Summary: SSLContext.load_cert_chain() keyfile argument can't be set to None
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: python
Version: 7.2
Hardware: All
OS: Linux
unspecified
high
Target Milestone: rc
: ---
Assignee: Robert Kuska
QA Contact: Branislav Náter
URL:
Whiteboard:
Depends On:
Blocks: 1248675
TreeView+ depends on / blocked
 
Reported: 2015-08-05 14:49 UTC by Christian Heimes
Modified: 2016-04-18 10:17 UTC (History)
7 users (show)

Fixed In Version: python-2.7.5-31.el7
Doc Type: Bug Fix
Doc Text:
Cause: load_cert_chain couldn't accept None as a argument for keyfile Consequence: function would fail with error TypeError: coercing to Unicode: need string or buffer, NoneType found Fix: make function load_cert_chain accept None as a keyfile argument Result: load_cert_chain now accepts None as a keyfile argument
Clone Of:
Environment:
Last Closed: 2015-11-19 12:43:31 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 1248675 0 unspecified CLOSED ipa vault internal error 2021-02-22 00:41:40 UTC
Red Hat Product Errata RHSA-2015:2101 0 normal SHIPPED_LIVE Moderate: python security, bug fix, and enhancement update 2015-11-19 11:04:15 UTC

Description Christian Heimes 2015-08-05 14:49:42 UTC 
Description of problem:
The backport of SSLContext to Python 2.7.5 has a bug in load_cert_chain() method. In vanilla Python 2.7.9 and 3.x the second argument to load_cert_chain() is optional and can also be set to None. However in RHEL's Python 2.7.5 None is not supported as second argument. This breaks requests and urllib3 with client cert authentication.

Version-Release number of selected component (if applicable):
Python 2.7.5

How reproducible:
You can reproduce the issue without a cert and key file. Both calls to load_cert_chain() should raise an IOError, because the cert doesn't exist.

>>> import ssl
>>> ctx = ssl.SSLContext(ssl.PROTOCOL_TLSv1)
>>> ctx.load_cert_chain('/does/not/exist', None)
>>> ctx.load_cert_chain('/does/not/exist')

Actual results:
>>> ctx.load_cert_chain('/does/not/exist', None)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: coercing to Unicode: need string or buffer, NoneType found


Expected results:
>>> ctx.load_cert_chain('/does/not/exist', None)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IOError: [Errno 2] No such file or directory
>>> ctx.load_cert_chain('/does/not/exist')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IOError: [Errno 2] No such file or directory

Additional info:
See https://hg.python.org/cpython/file/648dcafa7e5f/Modules/_ssl.c#l2461 how Python 2.7.9 handles the key file argument.
Comment 4 Scott Poore 2015-08-07 16:16:18 UTC 
FYI, I just tested on an IPA server.  It looks like this issues I was seeing are resolved.

[root@master ~]# rpm -q python
python-2.7.5-31.el7.x86_64


[root@master ~]# python
Python 2.7.5 (default, Aug  6 2015, 10:12:10) 
[GCC 4.8.3 20140911 (Red Hat 4.8.3-9)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import ssl
>>> ctx = ssl.SSLContext(ssl.PROTOCOL_TLSv1)internal error has
>>> ctx.load_cert_chain('/does/not/exist', None)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IOError: [Errno 2] No such file or directory
>>> ctx.load_cert_chain('/does/not/exist')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IOError: [Errno 2] No such file or directory
>>> 

And the actual place I was seeing the issue on IPA:

[root@master ~]# ipa vault-add MyVault01 --password=Secret123
-----------------------
Added vault "MyVault01"
-----------------------
  Vault name: MyVault01
  Type: standard
  Owner users: admin

Previously I was seeing the internal error as shown in the IPA bug this was blocking.

Thanks,
Scott
Comment 6 errata-xmlrpc 2015-11-19 12:43:31 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-2101.html
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