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Bug 1344657

Summary:	The AD keytab renewal task leaks a file descriptor
Product:	Red Hat Enterprise Linux 6	Reporter:	Marcel Kolaja <mkolaja>
Component:	sssd	Assignee:	SSSD Maintainers <sssd-maint>
Status:	CLOSED ERRATA	QA Contact:	Steeve Goveas <sgoveas>
Severity:	urgent	Docs Contact:
Priority:	urgent
Version:	6.0	CC:	ekeck, enewland, grajaiya, jhrozek, lslebodn, mkolaja, mkosek, mniranja, mzidek, pbrezina, sgoveas, sssd-maint
Target Milestone:	rc	Keywords:	ZStream
Target Release:	---
Hardware:	All
OS:	All
Whiteboard:
Fixed In Version:	sssd-1.13.3-22.el6_8.3	Doc Type:	Bug Fix
Doc Text:	Every execution of the keytab renewal task previously leaked a file descriptor, which eventually exhausted system resources. Now, the AD provider properly closes both ends of the two-way pipe opened to communicate with the helper adcli process. Running the keytab renewal task no longer allocates new system resources.	Story Points:	---
Clone Of:	1340176	Environment:
Last Closed:	2016-07-12 18:36:23 UTC	Type:	---
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:	1340176
Bug Blocks:

Description Marcel Kolaja 2016-06-10 09:25:17 UTC

This bug has been copied from bug #1340176 and has been proposed
to be backported to 6.8 z-stream (EUS).

Comment 4 Niranjan Mallapadi Raghavender 2016-07-04 09:29:30 UTC

Versions:
========
Red Hat Enterprise Linux Client release 6.8 (Santiago)

sssd-common-1.13.3-22.el6.x86_64
sssd-ipa-1.13.3-22.el6.x86_64
sssd-1.13.3-22.el6.x86_64
sssd-client-1.13.3-22.el6.x86_64
python-sssdconfig-1.13.3-22.el6.noarch
sssd-krb5-common-1.13.3-22.el6.x86_64
sssd-ad-1.13.3-22.el6.x86_64
sssd-ldap-1.13.3-22.el6.x86_64
sssd-proxy-1.13.3-22.el6.x86_64
sssd-common-pac-1.13.3-22.el6.x86_64
sssd-krb5-1.13.3-22.el6.x86_64


Steps to reproduce:
1. Join the system to Windows Active Directory

$net ads join -U Administrator%Secret123 -k
Using short domain name -- SSSDAD2012R2
Joined 'VM-IDM-003' to dns domain 'sssdad2012r2.com'
DNS Update for vm-idm-003.lab.eng.pnq.redhat.com failed: ERROR_DNS_GSS_ERROR
DNS update failed!

[root@vm-idm-003 samba]# klist -k /etc/krb5.keytab
Keytab name: FILE:/etc/krb5.keytab
KVNO Principal
---- --------------------------------------------------------------------------
   2 host/vm-idm-003.lab.eng.pnq.redhat.com
   2 host/vm-idm-003.lab.eng.pnq.redhat.com
   2 host/vm-idm-003.lab.eng.pnq.redhat.com
   2 host/vm-idm-003.lab.eng.pnq.redhat.com
   2 host/vm-idm-003.lab.eng.pnq.redhat.com
   2 host/vm-idm-003
   2 host/vm-idm-003
   2 host/vm-idm-003
   2 host/vm-idm-003
   2 host/vm-idm-003
   2 VM-IDM-003$@SSSDAD2012R2.COM
   2 VM-IDM-003$@SSSDAD2012R2.COM
   2 VM-IDM-003$@SSSDAD2012R2.COM
   2 VM-IDM-003$@SSSDAD2012R2.COM
   2 VM-IDM-003$@SSSDAD2012R2.COM


2. Configure sssd.conf as below:

[sssd]
config_file_version = 2
domains = sssdad2012r2.com
services = nss, pam

[domain/sssdad2012r2.com]
id_provider = ad
auth_provider = ad
access_provider = ad
fallback_homedir = /home/%d/%u
use_fully_qualified_names = True
ad_machine_account_password_renewal_opts = 10:15
debug_level = 9

3. start sssd process

Before adcli is called for password renewal

[root@vm-idm-003 fd]# ls -ltr | wc -l
24
[root@vm-idm-003 fd]# date
Mon Jul  4 14:19:40 IST 2016

[root@vm-idm-003 fd]# ls -ltr
total 0
lrwx------. 1 root root 64 Jul  4 14:19 9 -> /var/lib/sss/db/config.ldb
l-wx------. 1 root root 64 Jul  4 14:19 8 -> pipe:[23791]
lr-x------. 1 root root 64 Jul  4 14:19 7 -> pipe:[23791]
lrwx------. 1 root root 64 Jul  4 14:19 6 -> [eventpoll]
l-wx------. 1 root root 64 Jul  4 14:19 5 -> pipe:[23798]
lr-x------. 1 root root 64 Jul  4 14:19 4 -> pipe:[23798]
lrwx------. 1 root root 64 Jul  4 14:19 3 -> [eventpoll]
l-wx------. 1 root root 64 Jul  4 14:19 25 -> pipe:[24038]
l-wx------. 1 root root 64 Jul  4 14:19 24 -> pipe:[23989]
lrwx------. 1 root root 64 Jul  4 14:19 21 -> socket:[23849]
lrwx------. 1 root root 64 Jul  4 14:19 2 -> /dev/null
lrwx------. 1 root root 64 Jul  4 14:19 19 -> socket:[23836]
lrwx------. 1 root root 64 Jul  4 14:19 18 -> socket:[23828]
l-wx------. 1 root root 64 Jul  4 14:19 17 -> /var/log/sssd/krb5_child.log
l-wx------. 1 root root 64 Jul  4 14:19 16 -> /var/log/sssd/ldap_child.log
lrwx------. 1 root root 64 Jul  4 14:19 15 -> socket:[23805]
lrwx------. 1 root root 64 Jul  4 14:19 14 -> socket:[23801]
lrwx------. 1 root root 64 Jul  4 14:19 13 -> /var/lib/sss/db/cache_sssdad2012r2.com.ldb
lrwx------. 1 root root 64 Jul  4 14:19 12 -> [eventpoll]
l-wx------. 1 root root 64 Jul  4 14:19 11 -> /var/log/sssd/sssd_sssdad2012r2.com.log
lr-x------. 1 root root 64 Jul  4 14:19 10 -> inotify
lrwx------. 1 root root 64 Jul  4 14:19 1 -> /dev/null
lrwx------. 1 root root 64 Jul  4 14:19 0 -> /dev/null

4. After every 10 seconds, the number of pipes created incresaes
root@vm-idm-003 fd]# ll
total 0
lrwx------. 1 root root 64 Jul  4 14:19 0 -> /dev/null
lrwx------. 1 root root 64 Jul  4 14:19 1 -> /dev/null
lr-x------. 1 root root 64 Jul  4 14:19 10 -> inotify
l-wx------. 1 root root 64 Jul  4 14:19 11 -> /var/log/sssd/sssd_sssdad2012r2.com.log
lrwx------. 1 root root 64 Jul  4 14:19 12 -> [eventpoll]
lrwx------. 1 root root 64 Jul  4 14:19 13 -> /var/lib/sss/db/cache_sssdad2012r2.com.ldb
lrwx------. 1 root root 64 Jul  4 14:19 14 -> socket:[23801]
lrwx------. 1 root root 64 Jul  4 14:19 15 -> socket:[23805]
l-wx------. 1 root root 64 Jul  4 14:19 16 -> /var/log/sssd/ldap_child.log
l-wx------. 1 root root 64 Jul  4 14:19 17 -> /var/log/sssd/krb5_child.log
lrwx------. 1 root root 64 Jul  4 14:19 18 -> socket:[23828]
lrwx------. 1 root root 64 Jul  4 14:19 19 -> socket:[23836]
lrwx------. 1 root root 64 Jul  4 14:19 2 -> /dev/null
lrwx------. 1 root root 64 Jul  4 14:19 21 -> socket:[23849]
l-wx------. 1 root root 64 Jul  4 14:19 24 -> pipe:[23989]
l-wx------. 1 root root 64 Jul  4 14:19 25 -> pipe:[24038]
l-wx------. 1 root root 64 Jul  4 14:20 26 -> pipe:[24189]
l-wx------. 1 root root 64 Jul  4 14:20 27 -> pipe:[24228]
l-wx------. 1 root root 64 Jul  4 14:20 28 -> pipe:[24265]
l-wx------. 1 root root 64 Jul  4 14:20 29 -> pipe:[24330]
lrwx------. 1 root root 64 Jul  4 14:19 3 -> [eventpoll]
l-wx------. 1 root root 64 Jul  4 14:20 30 -> pipe:[24387]
l-wx------. 1 root root 64 Jul  4 14:20 31 -> pipe:[24444]
l-wx------. 1 root root 64 Jul  4 14:21 32 -> pipe:[24490]
l-wx------. 1 root root 64 Jul  4 14:21 33 -> pipe:[24537]
l-wx------. 1 root root 64 Jul  4 14:21 34 -> pipe:[24576]
l-wx------. 1 root root 64 Jul  4 14:21 35 -> pipe:[24623]
l-wx------. 1 root root 64 Jul  4 14:21 36 -> pipe:[24703]
l-wx------. 1 root root 64 Jul  4 14:21 37 -> pipe:[24906]
l-wx------. 1 root root 64 Jul  4 14:21 38 -> pipe:[24968]
l-wx------. 1 root root 64 Jul  4 14:21 39 -> pipe:[25015]
lr-x------. 1 root root 64 Jul  4 14:19 4 -> pipe:[23798]
l-wx------. 1 root root 64 Jul  4 14:22 40 -> pipe:[25070]
l-wx------. 1 root root 64 Jul  4 14:22 41 -> pipe:[25119]
l-wx------. 1 root root 64 Jul  4 14:22 42 -> pipe:[25167]
l-wx------. 1 root root 64 Jul  4 14:22 43 -> pipe:[25214]
l-wx------. 1 root root 64 Jul  4 14:23 44 -> pipe:[25271]
l-wx------. 1 root root 64 Jul  4 14:23 45 -> pipe:[25308]
l-wx------. 1 root root 64 Jul  4 14:23 46 -> pipe:[25345]
l-wx------. 1 root root 64 Jul  4 14:23 47 -> pipe:[25382]
l-wx------. 1 root root 64 Jul  4 14:23 48 -> pipe:[25419]
l-wx------. 1 root root 64 Jul  4 14:23 49 -> pipe:[25456]
l-wx------. 1 root root 64 Jul  4 14:19 5 -> pipe:[23798]
l-wx------. 1 root root 64 Jul  4 14:23 51 -> pipe:[25553]
l-wx------. 1 root root 64 Jul  4 14:24 52 -> pipe:[25607]
l-wx------. 1 root root 64 Jul  4 14:24 53 -> pipe:[25654]
l-wx------. 1 root root 64 Jul  4 14:24 54 -> pipe:[25701]
l-wx------. 1 root root 64 Jul  4 14:24 55 -> pipe:[25738]
l-wx------. 1 root root 64 Jul  4 14:24 56 -> pipe:[25811]
l-wx------. 1 root root 64 Jul  4 14:30 57 -> pipe:[25873]
l-wx------. 1 root root 64 Jul  4 14:30 58 -> pipe:[25910]
l-wx------. 1 root root 64 Jul  4 14:30 59 -> pipe:[25947]
lrwx------. 1 root root 64 Jul  4 14:19 6 -> [eventpoll]
l-wx------. 1 root root 64 Jul  4 14:30 60 -> pipe:[25994]
l-wx------. 1 root root 64 Jul  4 14:30 61 -> pipe:[26031]
l-wx------. 1 root root 64 Jul  4 14:30 62 -> pipe:[26070]
l-wx------. 1 root root 64 Jul  4 14:30 63 -> pipe:[26107]
l-wx------. 1 root root 64 Jul  4 14:30 64 -> pipe:[26144]
l-wx------. 1 root root 64 Jul  4 14:30 65 -> pipe:[26181]
l-wx------. 1 root root 64 Jul  4 14:30 66 -> pipe:[26228]
l-wx------. 1 root root 64 Jul  4 14:30 67 -> pipe:[26265]
l-wx------. 1 root root 64 Jul  4 14:30 68 -> pipe:[26302]
l-wx------. 1 root root 64 Jul  4 14:30 69 -> pipe:[26339]
lr-x------. 1 root root 64 Jul  4 14:19 7 -> pipe:[23791]
l-wx------. 1 root root 64 Jul  4 14:30 70 -> pipe:[26376]
l-wx------. 1 root root 64 Jul  4 14:30 71 -> pipe:[26423]
l-wx------. 1 root root 64 Jul  4 14:30 72 -> pipe:[26460]
l-wx------. 1 root root 64 Jul  4 14:30 73 -> pipe:[26507]
l-wx------. 1 root root 64 Jul  4 14:30 74 -> pipe:[26544]
l-wx------. 1 root root 64 Jul  4 14:30 75 -> pipe:[26581]
l-wx------. 1 root root 64 Jul  4 14:30 76 -> pipe:[26618]
l-wx------. 1 root root 64 Jul  4 14:30 77 -> pipe:[26667]
l-wx------. 1 root root 64 Jul  4 14:30 78 -> pipe:[26714]
l-wx------. 1 root root 64 Jul  4 14:30 79 -> pipe:[26751]
l-wx------. 1 root root 64 Jul  4 14:19 8 -> pipe:[23791]
l-wx------. 1 root root 64 Jul  4 14:30 80 -> pipe:[26788]
l-wx------. 1 root root 64 Jul  4 14:30 81 -> pipe:[26825]
l-wx------. 1 root root 64 Jul  4 14:30 82 -> pipe:[26862]
l-wx------. 1 root root 64 Jul  4 14:30 83 -> pipe:[26899]
l-wx------. 1 root root 64 Jul  4 14:30 84 -> pipe:[26936]
l-wx------. 1 root root 64 Jul  4 14:30 85 -> pipe:[26973]
l-wx------. 1 root root 64 Jul  4 14:30 86 -> pipe:[27010]
l-wx------. 1 root root 64 Jul  4 14:30 87 -> pipe:[27047]
l-wx------. 1 root root 64 Jul  4 14:30 88 -> pipe:[27084]
l-wx------. 1 root root 64 Jul  4 14:30 89 -> pipe:[27149]
lrwx------. 1 root root 64 Jul  4 14:19 9 -> /var/lib/sss/db/


5. Update sssd packages to sssd-1.13.3-22.el6_8.3.x86_64.rpm

6. Restart sssd process

7. Verify pipes created 

[root@vm-idm-003 fd]# ls -ltr | grep pipe
l-wx------. 1 root root 64 Jul  4 14:50 8 -> pipe:[50646]
lr-x------. 1 root root 64 Jul  4 14:50 7 -> pipe:[50646]
l-wx------. 1 root root 64 Jul  4 14:50 5 -> pipe:[50651]
lr-x------. 1 root root 64 Jul  4 14:50 4 -> pipe:[50651]
[root@vm-idm-003 fd]# 

[root@vm-idm-003 fd]# date
Mon Jul  4 14:54:21 IST 2016

[root@vm-idm-003 fd]# ls -ltr | grep pipe
l-wx------. 1 root root 64 Jul  4 14:50 8 -> pipe:[50646]
lr-x------. 1 root root 64 Jul  4 14:50 7 -> pipe:[50646]
l-wx------. 1 root root 64 Jul  4 14:50 5 -> pipe:[50651]
lr-x------. 1 root root 64 Jul  4 14:50 4 -> pipe:[50651]

After 5 minutes, 
[root@vm-idm-003 fd]# date
Mon Jul  4 14:58:02 IST 2016

[root@vm-idm-003 fd]# date
Mon Jul  4 14:59:00 IST 2016
[root@vm-idm-003 fd]# ls -ltr | grep pipe | wc -l
4
[root@vm-idm-003 fd]# ls -ltr | grep pipe
l-wx------. 1 root root 64 Jul  4 14:50 8 -> pipe:[50646]
lr-x------. 1 root root 64 Jul  4 14:50 7 -> pipe:[50646]
l-wx------. 1 root root 64 Jul  4 14:50 5 -> pipe:[50651]
lr-x------. 1 root root 64 Jul  4 14:50 4 -> pipe:[50651]

Comment 6 errata-xmlrpc 2016-07-12 18:36:23 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-2016:1407