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Bug 1364444 - Python fails to decode X.509 cert with GEN_RID subject alt name
Summary: Python fails to decode X.509 cert with GEN_RID subject alt name
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: python
Version: 7.2
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Charalampos Stratakis
QA Contact: Branislav Náter
URL:
Whiteboard:
Depends On:
Blocks: 1380359 1393868
TreeView+ depends on / blocked
 
Reported: 2016-08-05 11:09 UTC by Christian Heimes
Modified: 2017-08-01 20:25 UTC (History)
4 users (show)

Fixed In Version: python-2.7.5-49.el7
Doc Type: No Doc Update
Doc Text:
undefined
Clone Of:
: 1402154 (view as bug list)
Environment:
Last Closed: 2017-08-01 20:25:03 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Python 27691 0 None None None 2016-08-08 09:04:29 UTC
Red Hat Product Errata RHSA-2017:1868 0 normal SHIPPED_LIVE Moderate: python security and bug fix update 2017-08-01 18:24:21 UTC

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
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