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Bug 1677355 - NSS responder does no refresh domain list when busy
Summary: NSS responder does no refresh domain list when busy
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: sssd
Version: 7.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: SSSD Maintainers
QA Contact: sssd-qe
URL:
Whiteboard: sync-to-jira
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-02-14 15:49 UTC by Sumit Bose
Modified: 2020-05-02 19:07 UTC (History)
10 users (show)

Fixed In Version: sssd-1.16.4-1.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2019-08-06 13:02:47 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Github SSSD sssd issues 4940 0 None None None 2020-05-02 19:07:19 UTC
Red Hat Product Errata RHSA-2019:2177 0 None None None 2019-08-06 13:03:05 UTC

Description Sumit Bose 2019-02-14 15:49:27 UTC 
Description of problem:

The NSS responder maintains a timeout to not check for new domains all the time. Unfortunately this timeout is reset with every request in sss_dp_get_domains_send() and as a result on a busy system to timeout never expires and the domain list is never refresh.
Comment 2 Sumit Bose 2019-02-22 18:35:27 UTC 
Upstream ticket:
https://pagure.io/SSSD/sssd/issue/3967
Comment 3 Sumit Bose 2019-02-25 10:48:24 UTC 
How to test:

- use an AD or IPA setup with sub-domains, i.e. either other domains in the AD forest (AD) or a trust to an AD forest (IPA).
- start the client in offline mode with an empty cache, e.g. by removing all entries nameserver from /etc/resolv.conf.
- start a lookup for a sub-domain user ever 30s in a loop, it is expected that the lookup fails while offline
- add the nameserver entries back to /etc/resolve.conf
- with a fixed version the user lookup in the loop should succeed after about 2 minute (1 minute default offline timeout + 1 minute default domain refresh timeout) or shorter
- with a broken version the user lookup in the loop should never succeed
Comment 4 Jakub Hrozek 2019-02-26 21:50:48 UTC 
* master: c013643
* sssd-1-16: 3824008
Comment 7 shridhar 2019-06-20 19:28:28 UTC 
verified with sssd-1.16.4-21.el7.x86_64



Issue reproduced with following version:
[root@vm-idm-016 ~]# rpm -q sssd
sssd-1.16.2-13.el7.x86_64

script used for testing
[root@vm-idm-016 ~]# cat new.sh 
#!/bin/bash

cat /etc/resolv.conf > /etc/resolv.conf.bk
echo "Printing backed up resolv.conf.bk"
cat /etc/resolv.conf.bk
echo > /etc/resolv.conf
echo "Printing Modified resolv.conf"
cat /etc/resolv.conf
service sssd stop ; rm -rf /var/lib/sss/db/* ; rm -rf /var/log/sssd/* ; systemctl start sssd
echo " SSSD is starting in offline mode"
for i in `seq 4`; do id administrator.com; echo 'delay 30 secs' ; sleep 30 ; done
echo "Printing restored resolv.conf"
cat /etc/resolv.conf.bk > /etc/resolv.conf
cat /etc/resolv.conf
for i in `seq 12`; do id administrator.com; echo 'delay 30 sec'; sleep 30 ; done


[root@vm-idm-016 ~]# 



-016 ~]# bash new.sh 
Printing backed up resolv.conf.bk
nameserver 22.65.207.47
#nameserver 22.65.201.89
#nameserver 22.68.5.26

Printing Modified resolv.conf

Redirecting to /bin/systemctl stop sssd.service
 SSSD is starting in offline mode
id: administrator.com: no such user
delay 30 secs
id: administrator.com: no such user
delay 30 secs
id: administrator.com: no such user
delay 30 secs
id: administrator.com: no such user
delay 30 secs
Printing restored resolv.conf
nameserver 10.65.207.47
#nameserver 10.65.201.89
#nameserver 10.68.5.26

id: administrator.com: no such user
delay 30 sec
id: administrator.com: no such user
delay 30 sec
id: administrator.com: no such user
delay 30 sec
id: administrator.com: no such user
delay 30 sec
id: administrator.com: no such user
delay 30 sec
id: administrator.com: no such user
delay 30 sec
id: administrator.com: no such user
delay 30 sec
id: administrator.com: no such user
delay 30 sec
id: administrator.com: no such user
delay 30 sec
id: administrator.com: no such user
delay 30 sec
id: administrator.com: no such user
delay 30 sec
id: administrator.com: no such user
delay 30 sec




[root@vm-idm-016 ~]# yum update sssd
Loaded plugins: product-id, search-disabled-repos, subscription-manager
.
[........]
.
  Verifying  : libsss_autofs-1.16.2-13.el7.x86_64                                                                                                                                                                     29/30 
  Verifying  : sssd-proxy-1.16.2-13.el7.x86_64                                                                                                                                                                        30/30 

Updated:
  sssd.x86_64 0:1.16.4-21.el7                                                                                                                                                                                               

Dependency Updated:
  libipa_hbac.x86_64 0:1.16.4-21.el7      libsss_autofs.x86_64 0:1.16.4-21.el7         libsss_idmap.x86_64 0:1.16.4-21.el7      libsss_sudo.x86_64 0:1.16.4-21.el7          python-sssdconfig.noarch 0:1.16.4-21.el7     
  sssd-ad.x86_64 0:1.16.4-21.el7          sssd-client.x86_64 0:1.16.4-21.el7           sssd-common.x86_64 0:1.16.4-21.el7       sssd-common-pac.x86_64 0:1.16.4-21.el7      sssd-ipa.x86_64 0:1.16.4-21.el7              
  sssd-krb5.x86_64 0:1.16.4-21.el7        sssd-krb5-common.x86_64 0:1.16.4-21.el7      sssd-ldap.x86_64 0:1.16.4-21.el7         sssd-proxy.x86_64 0:1.16.4-21.el7          

Complete!



[root@vm-idm-016 ~]# rpm -q sssd
sssd-1.16.4-21.el7.x86_64


[root@vm-idm-016 ~]# bash new.sh 
Printing backed up resolv.conf.bk
nameserver 22.65.207.47
#nameserver 22.65.201.89
#nameserver 22.68.5.26

Printing Modified resolv.conf

Redirecting to /bin/systemctl stop sssd.service
 SSSD is starting in offline mode
id: administrator.com: no such user
delay 30 secs
id: administrator.com: no such user
delay 30 secs
id: administrator.com: no such user
delay 30 secs
id: administrator.com: no such user
delay 30 secs
Printing restored resolv.conf
nameserver 22.65.207.47
#nameserver 22.65.201.89
#nameserver 22.68.5.26

id: administrator.com: no such user
delay 30 sec
id: administrator.com: no such user
delay 30 sec
uid=651800500(administrator.com) gid=651800500(administrator.com) groups=651800500(administrator.com),651800520(group policy creator owners.com),651800512(domain admins.com),651800513(domain users.com)
delay 30 sec
uid=651800500(administrator.com) gid=651800500(administrator.com) groups=651800500(administrator.com),651800520(group policy creator owners.com),651800512(domain admins.com),651800513(domain users.com)
delay 30 sec
^C
[root@vm-idm-016 ~]#
Comment 9 errata-xmlrpc 2019-08-06 13:02:47 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-2019:2177
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