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Bug 1364444

Summary:	Python fails to decode X.509 cert with GEN_RID subject alt name
Product:	Red Hat Enterprise Linux 7	Reporter:	Christian Heimes <cheimes>
Component:	python	Assignee:	Charalampos Stratakis <cstratak>
Status:	CLOSED ERRATA	QA Contact:	Branislav Náter <bnater>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.2	CC:	bnater, cstratak, pviktori, rmeggins
Target Milestone:	rc	Keywords:	Patch
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	python-2.7.5-49.el7	Doc Type:	No Doc Update
Doc Text:	undefined	Story Points:	---
Clone Of:
Clones:	1402154 (view as bug list)		Environment:
Last Closed:	2017-08-01 20:25:03 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:	1380359, 1393868

Description Christian Heimes 2016-08-05 11:09:35 UTC

Description of problem:
Python fails to decode X.509 certificate with a GEN_RID general name in subject alternative names. The problem makes it impossible to verify that a server certificate matches a host name. On the other hand registered id are required for SearchGuard 2.x with Elasticsearch 2.x. #1364268 has more information.

Version-Release number of selected component (if applicable):
All versions of Python in RHEL and Fedora are affected.

How reproducible:
The bug can be reproduced with any certificate that has a registered id (GEN_RID) in the X509v3 subject alt name extension.

Steps to Reproduce:
1. Download rid.pem from https://bugs.python.org/issue27691
2. python -c "import _ssl; print(_ssl._test_decode_cert('rid.pem'))"

Actual results:
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: error return without exception set

Expected results:
{'OCSP': ('http://acme.test/ca/ocsp/tls-server-ca',), 'serialNumber': '01', 'crlDistributionPoints': ('http://acme.test/ca/tls-server-ca.crl',), 'version': 3, 'caIssuers': ('http://acme.test/ca/tls-server-ca.cer',), 'notAfter': 'Aug  5 09:13:13 2018 GMT', 'subjectAltName': (('Registered ID', '1.2.3.4.5.5'), ('DNS', 'localhost'), ('IP Address', '127.0.0.1'), ('IP Address', '0:0:0:0:0:0:0:1\n')), 'subject': ((('countryName', 'XX'),), (('organizationName', 'Acme Corp'),), (('organizationalUnitName', 'Acme Users'),), (('commonName', 'localhost'),)), 'issuer': ((('countryName', 'XX'),), (('organizationName', 'Acme Corp'),), (('organizationalUnitName', 'Acme Certificate Authority'),), (('commonName', 'Acme TLS Server CA'),)), 'notBefore': 'Aug  5 09:13:13 2016 GMT'}


Additional info:
The root cause of the Python bug is a bug in OpenSSL's GENERAL_NAME_print() function, see #1364268. The ticket on Python's bug tracker has a fix with unit tests.

Comment 2 Petr Viktorin (pviktori) 2016-08-08 09:04:29 UTC

Fixing Python tracker ID.

I plan to add devel_ack as soon as the patch is upstream.

Comment 5 Branislav Náter 2017-04-26 12:21:41 UTC

Reproduced on python-2.7.5-48.el7:

:: [  BEGIN   ] :: Running 'python -c "import _ssl; print(_ssl._test_decode_cert('rid.pem'))"'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: error return without exception set
:: [   FAIL   ] :: Command 'python -c "import _ssl; print(_ssl._test_decode_cert('rid.pem'))"' (Expected 0, got 1)

Verified on python-2.7.5-57.el7:
Python is able to decode certificate that has a registered id (GEN_RID) in the X509v3 subject alt name extension.

:: [  BEGIN   ] :: Running 'python -c "import _ssl; print(_ssl._test_decode_cert('rid.pem'))"'
{'crlDistributionPoints': (u'http://acme.test/ca/tls-server-ca.crl',), 'subjectAltName': ((u'Registered ID', u'1.2.3.4.5.5'), ('DNS', 'localhost'), ('IP Address', '127.0.0.1'), ('IP Address', '0:0:0:0:0:0:0:1\n')), 'notBefore': u'Aug  5 09:13:13 2016 GMT', 'caIssuers': (u'http://acme.test/ca/tls-server-ca.cer',), 'OCSP': (u'http://acme.test/ca/ocsp/tls-server-ca',), 'serialNumber': u'01', 'notAfter': 'Aug  5 09:13:13 2018 GMT', 'version': 3L, 'subject': ((('countryName', u'XX'),), (('organizationName', u'Acme Corp'),), (('organizationalUnitName', u'Acme Users'),), (('commonName', u'localhost'),)), 'issuer': ((('countryName', u'XX'),), (('organizationName', u'Acme Corp'),), (('organizationalUnitName', u'Acme Certificate Authority'),), (('commonName', u'Acme TLS Server CA'),))}
:: [   PASS   ] :: Command 'python -c "import _ssl; print(_ssl._test_decode_cert('rid.pem'))"' (Expected 0, got 0)

Comment 6 errata-xmlrpc 2017-08-01 20:25:03 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://access.redhat.com/errata/RHSA-2017:1868