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Bug 1375303

Summary:	gnutls trusts a certificate whose CA is both explicitly trusted and blacklisted
Product:	Red Hat Enterprise Linux 7	Reporter:	Stanislav Zidek <szidek>
Component:	gnutls	Assignee:	Nikos Mavrogiannopoulos <nmavrogi>
Status:	CLOSED ERRATA	QA Contact:	Stanislav Zidek <szidek>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.3	CC:	mgrepl
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	gnutls-3.3.26-1.el7	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-08-01 08:48:22 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:	1377248

Description Stanislav Zidek 2016-09-12 16:36:02 UTC

Description of problem:
If I add my custom CA to both /etc/pki/ca-trust/source/anchors and /etc/pki/ca-trust/source/blacklist (and run update-ca-trust), certificates signed by this CA are trusted.

Version-Release number of selected component (if applicable):
gnutls-3.3.24-1.el7

How reproducible:
always

Steps to Reproduce:
1. generate a CA and a server cert signed by it
2. add the CA to both /etc/pki/ca-trust/source/anchors and /etc/pki/ca-trust/source/blacklist
3. update-ca-trust
4. verify server cert (certtool --verify <server.pem)

Actual results:
Chain verification output: Verified. The certificate is trusted.

Expected results:
Blacklist has priority, server cert is not trusted.

Additional info:
I did further investigation and it really seems that the issue is only in this corner case. Blacklisting CA that is included in system by default works as expected.

Comment 7 errata-xmlrpc 2017-08-01 08:48:22 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-2017:2292