1286030 – restorecon sets an incorrect label on /var/lock/LCK.. (created by apcupsd)

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Bug 1286030 - restorecon sets an incorrect label on /var/lock/LCK.. (created by apcupsd)

Summary: restorecon sets an incorrect label on /var/lock/LCK.. (created by apcupsd)

Keywords:
Status:	CLOSED ERRATA
Alias:	None
Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	selinux-policy
Sub Component:
Version:	6.7
Hardware:	All
OS:	Linux
Priority:	medium
Severity:	medium
Target Milestone:	rc
Target Release:	---
Assignee:	Simon Sekidde
QA Contact:	Milos Malik
Docs Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+	depends on / blocked

Reported:	2015-11-27 09:57 UTC by Milos Malik
Modified:	2016-05-10 20:02 UTC (History)
CC List:	7 users (show)
Fixed In Version:	selinux-policy-3.7.19-286.el6
Doc Type:	Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed:	2016-05-10 20:02:49 UTC
Target Upstream Version:
Embargoed:

Attachments	(Terms of Use)

Links
System	ID	Private	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHBA-2016:0763	0	normal	SHIPPED_LIVE	selinux-policy bug fix update	2016-05-10 22:33:46 UTC

Description Milos Malik 2015-11-27 09:57:53 UTC

Description of problem:
# restorecon -Rv /var
restorecon reset /var/lock/LCK.. context unconfined_u:object_r:apcupsd_lock_t:s0->unconfined_u:object_r:var_lock_t:s0
# 

Version-Release number of selected component (if applicable):
apcupsd-3.14.12-1.el6.x86_64
apcupsd-cgi-3.14.12-1.el6.x86_64
selinux-policy-3.7.19-279.el6.noarch
selinux-policy-targeted-3.7.19-279.el6.noarch

How reproducible:
 * always

Steps to Reproduce:
1. get a RHEL-6.7 machine (active targeted policy)
2. start the apcupsd service
3. restorecon -Rv /var
4. stop the apcupsd service
5. search for SELinux denials

Actual results (enforcing mode):
----
type=PATH msg=audit(11/27/2015 04:54:50.269:362) : item=0 name=/var/lock/LCK.. inode=135046 dev=fc:01 mode=file,644 ouid=root ogid=root rdev=00:00 obj=unconfined_u:object_r:var_lock_t:s0 nametype=NORMAL 
type=CWD msg=audit(11/27/2015 04:54:50.269:362) :  cwd=/ 
type=SYSCALL msg=audit(11/27/2015 04:54:50.269:362) : arch=x86_64 syscall=open success=no exit=-13(Permission denied) a0=0xbf32ac a1=O_RDONLY a2=0x20 a3=0x7f4e91f8ca20 items=1 ppid=1 pid=2506 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=4 comm=apcupsd exe=/sbin/apcupsd subj=unconfined_u:system_r:apcupsd_t:s0 key=(null) 
type=AVC msg=audit(11/27/2015 04:54:50.269:362) : avc:  denied  { read } for  pid=2506 comm=apcupsd name=LCK.. dev=vda1 ino=135046 scontext=unconfined_u:system_r:apcupsd_t:s0 tcontext=unconfined_u:object_r:var_lock_t:s0 tclass=file 
----

Expected results:
 * no SELinux denials
# matchpathcon /var/lock/LCK.. 
/var/lock/LCK..	system_u:object_r:apcupsd_lock_t:s0
#

Comment 1 Miroslav Grepl 2015-11-30 12:01:12 UTC

Ok we have

/var/lock/subsys/apcupsd    --  gen_context(system_u:object_r:apcupsd_lock_t,s0)
/var/lock/LCK..         --  gen_context(system_u:object_r:apcupsd_lock_t,s0)


labeling in RHEL-7.

Comment 2 Milos Malik 2015-12-03 10:28:01 UTC

If SSSD is running and nsswitch.conf is configured in certain way then following AVC appears in enforcing mode:
----
type=PATH msg=audit(12/03/2015 11:18:45.061:61) : item=0 name=(null) inode=25543 dev=fc:03 mode=dir,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:sssd_var_lib_t:s0 nametype=NORMAL 
type=SOCKADDR msg=audit(12/03/2015 11:18:45.061:61) : saddr=local /var/lib/sss/pipes/nss 
type=SYSCALL msg=audit(12/03/2015 11:18:45.061:61) : arch=x86_64 syscall=connect success=no exit=-13(Permission denied) a0=0x3 a1=0x7ffd7b1cb550 a2=0x6e a3=0x7ffd7b1cb1e0 items=1 ppid=5697 pid=5708 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=tty sgid=tty fsgid=tty tty=(none) ses=1 comm=wall exe=/usr/bin/wall subj=unconfined_u:system_r:apcupsd_t:s0 key=(null) 
type=AVC msg=audit(12/03/2015 11:18:45.061:61) : avc:  denied  { search } for  pid=5708 comm=wall name=sss dev=vda3 ino=25543 scontext=unconfined_u:system_r:apcupsd_t:s0 tcontext=system_u:object_r:sssd_var_lib_t:s0 tclass=dir 
----

The denial is usually accompanied by following messages in the terminal:
# 
Broadcast message from root (Thu Dec  3 11:24:36 2015):

Warning communications lost with UPS 

#

Comment 3 Milos Malik 2015-12-03 10:34:32 UTC

Following AVCs appeared in permissive mode:
----
type=PATH msg=audit(12/03/2015 11:31:14.957:133) : item=0 name=/var/lib/sss/mc/passwd inode=437 dev=fc:03 mode=file,644 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:sssd_public_t:s0 nametype=NORMAL 
type=CWD msg=audit(12/03/2015 11:31:14.957:133) :  cwd=/ 
type=SYSCALL msg=audit(12/03/2015 11:31:14.957:133) : arch=x86_64 syscall=open success=yes exit=3 a0=0x9822f0 a1=O_RDONLY|O_CLOEXEC a2=0x7ffc1816e12c a3=0x7ffc1816ddd0 items=1 ppid=10213 pid=10606 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=1 comm=apccontrol exe=/bin/bash subj=unconfined_u:system_r:apcupsd_t:s0 key=(null) 
type=AVC msg=audit(12/03/2015 11:31:14.957:133) : avc:  denied  { open } for  pid=10606 comm=apccontrol name=passwd dev=vda3 ino=437 scontext=unconfined_u:system_r:apcupsd_t:s0 tcontext=system_u:object_r:sssd_public_t:s0 tclass=file 
type=AVC msg=audit(12/03/2015 11:31:14.957:133) : avc:  denied  { read } for  pid=10606 comm=apccontrol name=passwd dev=vda3 ino=437 scontext=unconfined_u:system_r:apcupsd_t:s0 tcontext=system_u:object_r:sssd_public_t:s0 tclass=file 
type=AVC msg=audit(12/03/2015 11:31:14.957:133) : avc:  denied  { search } for  pid=10606 comm=apccontrol name=mc dev=vda3 ino=25545 scontext=unconfined_u:system_r:apcupsd_t:s0 tcontext=system_u:object_r:sssd_public_t:s0 tclass=dir 
type=AVC msg=audit(12/03/2015 11:31:14.957:133) : avc:  denied  { search } for  pid=10606 comm=apccontrol name=sss dev=vda3 ino=25543 scontext=unconfined_u:system_r:apcupsd_t:s0 tcontext=system_u:object_r:sssd_var_lib_t:s0 tclass=dir 
----
type=SYSCALL msg=audit(12/03/2015 11:31:14.961:134) : arch=x86_64 syscall=fstat success=yes exit=0 a0=0x3 a1=0x7ffc1816e090 a2=0x7ffc1816e090 a3=0x7ffc1816de00 items=0 ppid=10213 pid=10606 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=1 comm=apccontrol exe=/bin/bash subj=unconfined_u:system_r:apcupsd_t:s0 key=(null) 
type=AVC msg=audit(12/03/2015 11:31:14.961:134) : avc:  denied  { getattr } for  pid=10606 comm=apccontrol path=/var/lib/sss/mc/passwd dev=vda3 ino=437 scontext=unconfined_u:system_r:apcupsd_t:s0 tcontext=system_u:object_r:sssd_public_t:s0 tclass=file 
----
type=PATH msg=audit(12/03/2015 11:31:14.961:135) : item=0 name=(null) inode=370 dev=fc:03 mode=socket,666 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:sssd_var_lib_t:s0 nametype=NORMAL 
type=SOCKADDR msg=audit(12/03/2015 11:31:14.961:135) : saddr=local /var/lib/sss/pipes/nss 
type=SYSCALL msg=audit(12/03/2015 11:31:14.961:135) : arch=x86_64 syscall=connect success=yes exit=0 a0=0x4 a1=0x7ffc1816e0f0 a2=0x6e a3=0x7ffc1816dd80 items=1 ppid=10213 pid=10606 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=1 comm=apccontrol exe=/bin/bash subj=unconfined_u:system_r:apcupsd_t:s0 key=(null) 
type=AVC msg=audit(12/03/2015 11:31:14.961:135) : avc:  denied  { connectto } for  pid=10606 comm=apccontrol path=/var/lib/sss/pipes/nss scontext=unconfined_u:system_r:apcupsd_t:s0 tcontext=system_u:system_r:sssd_t:s0 tclass=unix_stream_socket 
type=AVC msg=audit(12/03/2015 11:31:14.961:135) : avc:  denied  { write } for  pid=10606 comm=apccontrol name=nss dev=vda3 ino=370 scontext=unconfined_u:system_r:apcupsd_t:s0 tcontext=system_u:object_r:sssd_var_lib_t:s0 tclass=sock_file 
----

Comment 8 errata-xmlrpc 2016-05-10 20:02:49 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://rhn.redhat.com/errata/RHBA-2016-0763.html

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