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Bug 1250611

Summary:	SSLContext.load_cert_chain() keyfile argument can't be set to None
Product:	Red Hat Enterprise Linux 7	Reporter:	Christian Heimes <cheimes>
Component:	python	Assignee:	Robert Kuska <rkuska>
Status:	CLOSED ERRATA	QA Contact:	Branislav Náter <bnater>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	7.2	CC:	edewata, florian, isenfeld, jberan, mstuchli, rkuska, spoore
Target Milestone:	rc	Keywords:	TestBlocker
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
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	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-11-19 12:43:31 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1248675

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