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Bug 1678550 - Unbound still try dnssec lameness check when domain-insecure is set for a stub zone with multiple stub-addr(s)
Summary: Unbound still try dnssec lameness check when domain-insecure is set for a stu...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: unbound
Version: 7.6
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Petr Menšík
QA Contact: Petr Dancak
URL:
Whiteboard:
Depends On:
Blocks: 1709724 1716960
TreeView+ depends on / blocked
 
Reported: 2019-02-19 04:47 UTC by Masahiro Matsuya
Modified: 2022-03-13 17:00 UTC (History)
3 users (show)

Fixed In Version: unbound-1.6.6-2.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-03-31 19:58:17 UTC
Target Upstream Version:
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2020:1092 0 None None None 2020-03-31 19:58:24 UTC

Description Masahiro Matsuya 2019-02-19 04:47:56 UTC 
Description of problem:

This has already been reported on upstream and fixed.
   https://www.nlnetlabs.nl/bugs-script/show_bug.cgi?id=2882

When one of stub servers gets down, the unbound takes much time to process the DNS query in the stub zone, because it tries the dnssec lameness check which is not required. domain-insecure is set to those domain.

Version-Release number of selected component (if applicable):
RHEL7.6

How reproducible:
Always

Steps to Reproduce:
1. Configure unbound as below.

domain-insecure: "example.com"
verbosity: 5 
log-time-ascii: yes
log-queries: yes
log-replies: yes

stub-zone:
  name: "example.com"
  stub-addr: 192.168.1.207
  stub-addr: 192.168.1.211
  stub-addr: 192.168.1.213


NOTE: The stub server should be authoritative DNS server, and DNSSEC is not enabled.

2. shutdown one of stub-server
3. see the delay with dig command to query any hostname in "example.com"
And, see the following message in the verbose log.

  Feb 13 12:18:20 unbound: [26566:0] debug: dnssec status: expected
  Feb 13 12:18:20 unbound: [26566:0] info: query response was DNSSEC LAME


NOTE: To get the message of 'debug' level, need to configure rsyslog. for example:

  daemon.*    /var/log/daemon.log

Actual results:
When one of the stub servers shut down, the dns query has quite big delay. sometimes it timed out. DNS lameness check is done by unbound.

Expected results:
The dns query can complete without delay even when one of stub servers shut down.

Additional info:

A workaround is using "disable-dnssec-lame-check yes".
But, it disables the check for the all domains, not only stub servers with domain-insecure.


The fix patch is:
https://github.com/NLnetLabs/unbound/commit/52aeaf4924ec3f6689e6aafedbe41473d2bda992
Comment 13 errata-xmlrpc 2020-03-31 19:58:17 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/RHBA-2020:1092
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