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Bug 1179968 - The setfiles utility is prevented from reading files of type admin_home_t
Summary: The setfiles utility is prevented from reading files of type admin_home_t
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: selinux-policy
Version: 6.6
Hardware: All
OS: Linux
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Miroslav Grepl
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2015-01-07 23:00 UTC by Robert Nichols
Modified: 2015-07-22 07:10 UTC (History)
7 users (show)

Fixed In Version: selinux-policy-3.7.19-266.el6
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-07-22 07:10:40 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2015:1375 0 normal SHIPPED_LIVE selinux-policy bug fix and enhancement update 2015-07-20 18:07:47 UTC

Description Robert Nichols 2015-01-07 23:00:44 UTC 
Description of problem:
Running "semanage -i someFile" where someFile is type admin_home_t results in an AVC denial when setfiles tries to read it.

Version-Release number of selected component (if applicable):
selinux-policy-3.7.19-260.el6_6.1.noarch
selinux-policy-targeted-3.7.19-260.el6_6.1.noarch
policycoreutils-2.0.83-19.47.el6_6.1.x86_64

How reproducible:
Always

Steps to Reproduce:
1. In root's home directory, create a file myContext with the single line like:
       fcontext -a -f 'character device' -t tty_device_t '/dev/UPS'
2. Verify that the file's type is "admin_home_t"
3. Run "semanage -i myContext" from root's unconfined domain

Actual results:
An AVC denial for setfiles with source context setfiles_t and target context admin_home_t

Expected results:
No denial

Additional info:
setfiles_t is allowed to read user_home_t, file_t, and a host of other types. It is strange that it would be restricted from reading admin_home_t.
Comment 2 Milos Malik 2015-01-08 09:33:09 UTC 
# ls -Z ./local-mods 
-rw-r--r--. root root unconfined_u:object_r:admin_home_t:s0 ./local-mods
# cat ./local-mods 
boolean -1 virt_use_sysfs
# semanage -i ./local-mods 
#

It looks like a leaked file descriptor. Here are AVCs gathered in enforcing mode:
----
type=PATH msg=audit(01/08/2015 10:28:52.680:268) : item=1 name=(null) inode=325938 dev=fc:03 mode=file,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:ld_so_t:s0 nametype=NORMAL 
type=PATH msg=audit(01/08/2015 10:28:52.680:268) : item=0 name=/sbin/load_policy inode=292115 dev=fc:03 mode=file,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:load_policy_exec_t:s0 nametype=NORMAL 
type=CWD msg=audit(01/08/2015 10:28:52.680:268) :  cwd=/root 
type=EXECVE msg=audit(01/08/2015 10:28:52.680:268) : argc=1 a0=/sbin/load_policy 
type=SYSCALL msg=audit(01/08/2015 10:28:52.680:268) : arch=x86_64 syscall=execve success=yes exit=0 a0=0x4e127c0 a1=0x3812700 a2=0x0 a3=0x12 items=2 ppid=5872 pid=5880 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=pts0 ses=6 comm=load_policy exe=/sbin/load_policy subj=unconfined_u:unconfined_r:load_policy_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(01/08/2015 10:28:52.680:268) : avc:  denied  { read } for  pid=5880 comm=load_policy path=/root/local-mods dev=vda3 ino=364658 scontext=unconfined_u:unconfined_r:load_policy_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:admin_home_t:s0 tclass=file 
----
type=PATH msg=audit(01/08/2015 10:28:54.685:270) : item=1 name=(null) inode=325938 dev=fc:03 mode=file,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:ld_so_t:s0 nametype=NORMAL 
type=PATH msg=audit(01/08/2015 10:28:54.685:270) : item=0 name=/sbin/setfiles inode=292163 dev=fc:03 mode=file,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:setfiles_exec_t:s0 nametype=NORMAL 
type=CWD msg=audit(01/08/2015 10:28:54.685:270) :  cwd=/root 
type=EXECVE msg=audit(01/08/2015 10:28:54.685:270) : argc=5 a0=/sbin/setfiles a1=-q a2=-c a3=/etc/selinux/targeted/policy/policy.24 a4=/etc/selinux/targeted/contexts/files/file_contexts 
type=SYSCALL msg=audit(01/08/2015 10:28:54.685:270) : arch=x86_64 syscall=execve success=yes exit=0 a0=0x4e5d920 a1=0x763bcd0 a2=0x0 a3=0x31 items=2 ppid=5872 pid=5886 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=pts0 ses=6 comm=setfiles exe=/sbin/setfiles subj=unconfined_u:unconfined_r:setfiles_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(01/08/2015 10:28:54.685:270) : avc:  denied  { read } for  pid=5886 comm=setfiles path=/root/local-mods dev=vda3 ino=364658 scontext=unconfined_u:unconfined_r:setfiles_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:admin_home_t:s0 tclass=file 
----
Comment 3 Miroslav Grepl 2015-03-03 11:12:59 UTC 
commit 0cabf48d05f00c68f597b8ffdc74d6297eee2237
Author: Miroslav Grepl <mgrepl>
Date:   Tue Mar 3 12:12:23 2015 +0100

    Allow setfiles domain to access files with admin_home_t. semanage -i /root/testfile.
Comment 6 Miroslav Grepl 2015-05-12 07:08:56 UTC 
commit a69bedf1046a3771f45589971ad6ec327e475313
Author: Miroslav Grepl <mgrepl>
Date:   Tue May 12 09:05:16 2015 +0200

    Dontaudit read access on admin_home_t for load_policy.
Comment 8 errata-xmlrpc 2015-07-22 07:10:40 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-2015-1375.html
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