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Bug 1154759 - AVCs appears when joining to Win AD via winbind
Summary: AVCs appears when joining to Win AD via winbind
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.1
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Miroslav Grepl
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2014-10-20 16:56 UTC by Patrik Kis
Modified: 2015-03-05 10:46 UTC (History)
5 users (show)

Fixed In Version: selinux-policy-3.13.1-7.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-03-05 10:46:19 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2015:0458 0 normal SHIPPED_LIVE selinux-policy bug fix and enhancement update 2015-03-05 15:17:00 UTC

Description Patrik Kis 2014-10-20 16:56:55 UTC 
Description of problem:
When joining to Windows active directory via winbibd the following AVCs appears. It looks like it has not impact on winbind functionality because the join itself is successful. Therefore, I'm not sure if this is an selinux-policy issue or winbibd is doing something that it shouldn't. Anyhow, assigning first the bug to selinux-policy the get their expertise.

Version-Release number of selected component (if applicable):
selinux-policy-3.13.1-4.el7
samba-winbind-4.1.12-4.el7

How reproducible:
always

Steps to Reproduce:
# realm join --client-software=winbind --membership-software=samba <winad.domain>

Actual results:

----
time->Mon Oct 20 12:43:34 2014
type=SYSCALL msg=audit(1413823414.744:22439): arch=80000016 syscall=5 success=no exit=-13 a0=3fffc652342 a1=0 a2=0 a3=0 items=0 ppid=1 pid=28225 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="winbindd" exe="/usr/sbin/winbindd" subj=system_u:system_r:winbind_t:s0 key=(null)
type=AVC msg=audit(1413823414.744:22439): avc:  denied  { read } for  pid=28225 comm="winbindd" name="core_pattern" dev="proc" ino=385571 scontext=system_u:system_r:winbind_t:s0 tcontext=system_u:object_r:usermodehelper_t:s0 tclass=file
----
time->Mon Oct 20 12:43:34 2014
type=SYSCALL msg=audit(1413823414.744:22440): arch=80000016 syscall=5 success=no exit=-13 a0=3fffc652342 a1=0 a2=0 a3=3fffc62613c items=0 ppid=1 pid=28225 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="winbindd" exe="/usr/sbin/winbindd" subj=system_u:system_r:winbind_t:s0 key=(null)
type=AVC msg=audit(1413823414.744:22440): avc:  denied  { read } for  pid=28225 comm="winbindd" name="core_pattern" dev="proc" ino=385571 scontext=system_u:system_r:winbind_t:s0 tcontext=system_u:object_r:usermodehelper_t:s0 tclass=file
----
time->Mon Oct 20 12:43:34 2014
type=SYSCALL msg=audit(1413823414.744:22441): arch=80000016 syscall=5 success=no exit=-13 a0=3fffc652342 a1=0 a2=0 a3=3fffc62613c items=0 ppid=1 pid=28225 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="winbindd" exe="/usr/sbin/winbindd" subj=system_u:system_r:winbind_t:s0 key=(null)
type=AVC msg=audit(1413823414.744:22441): avc:  denied  { read } for  pid=28225 comm="winbindd" name="core_pattern" dev="proc" ino=385571 scontext=system_u:system_r:winbind_t:s0 tcontext=system_u:object_r:usermodehelper_t:s0 tclass=file
Comment 2 Patrik Kis 2014-10-20 16:59:00 UTC 
And this used to work in RHEL-7.0 without any AVCs, so this is actually regression.
Comment 4 Milos Malik 2014-10-20 17:20:14 UTC 
Did it happen on a machine where abrt* packages were installed?

# ls -Z /proc/sys/kernel/core_pattern 
-rw-r--r--. root root system_u:object_r:usermodehelper_t:s0 /proc/sys/kernel/core_pattern
# cat /proc/sys/kernel/core_pattern 
|/usr/libexec/abrt-hook-ccpp %s %c %p %u %g %t e
#
Comment 5 Milos Malik 2014-10-20 17:29:27 UTC 
It is intentional:

# for I in `ldd /usr/sbin/winbindd | cut -d ' ' -f 3` ; do strings $I | grep core_pattern && echo $I ; done
/proc/sys/kernel/core_pattern
/lib64/libsmbconf.so.0
#

Executed on RHEL-7.0 machine:

# ls -Z /proc/sys/kernel/core_pattern 
-rw-r--r--. root root system_u:object_r:sysctl_kernel_t:s0 /proc/sys/kernel/core_pattern
#

Executed on RHEL-7.1 machine:
# ls -Z /proc/sys/kernel/core_pattern 
-rw-r--r--. root root system_u:object_r:usermodehelper_t:s0 /proc/sys/kernel/core_pattern
#

But there is not a default label for /proc/sys/kernel/core_pattern file in any el7 policy.
Comment 6 Patrik Kis 2014-10-21 08:10:55 UTC 
(In reply to Milos Malik from comment #4)
> Did it happen on a machine where abrt* packages were installed?
> 
> # ls -Z /proc/sys/kernel/core_pattern 
> -rw-r--r--. root root system_u:object_r:usermodehelper_t:s0
> /proc/sys/kernel/core_pattern
> # cat /proc/sys/kernel/core_pattern 
> |/usr/libexec/abrt-hook-ccpp %s %c %p %u %g %t e
> #

It does not matter if abrt is installed or not; the AVCs appear on machines with abrt and without abrt too.
Comment 7 Miroslav Grepl 2014-10-21 08:15:05 UTC 
Yes, we changes labeling for /proc/sys/kernel/core_pattern.
Comment 8 Miroslav Grepl 2014-10-29 13:15:38 UTC 
commit 3c1db279ff7ea40d9822f4d988fb13cdf667e3e4
Author: Miroslav Grepl <mgrepl>
Date:   Wed Oct 29 14:14:57 2014 +0100

    Allow winbind to access /proc/sys/kernel/core_pattern .
Comment 12 errata-xmlrpc 2015-03-05 10:46:19 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-2015-0458.html
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