[CentOS] SELinux and access across 'similar types'
Daniel J Walsh
dwalsh at redhat.com
Fri Jan 6 15:13:41 UTC 2012
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
On 01/06/2012 09:57 AM, Bennett Haselton wrote:
> On 1/6/2012 5:55 AM, RILINDO FOSTER wrote:
>> On Jan 6, 2012, at 7:40 AM, Philippe Naudin wrote:
>>
>>> Le ven 06 jan 2012 04:21:14 CET, Bennett Haselton a écrit:
>>>
>>>> On 1/6/2012 4:11 AM, Philippe Naudin wrote:
>>>>> Le ven 06 jan 2012 02:41:02 CET, Bennett Haselton a écrit:
>>>>>
>>>>>> On 1/6/2012 2:24 AM, Philippe Naudin wrote:
>>>>>>> Apache running as "init_t" is a call for troubles.
>>>>>> Is it? OK, any idea what caused that and how to fix it?
>>>>> No, sorry. Your httpd comes from CentOS ?
>>>> Yes
>>>>> Afaik, you should not have any process running in context
>>>>> init_t except init itself. If "ps awuxZ | grep [i]nit_t"
>>>>> returns more than only init and httpd, your problem is
>>>>> likely to be more complicated than a broken configuration
>>>>> of apache.
>>>> I've got a few...
>>>>
>>>> [root at g6950-21025 ~]# ps auwxZ | grep init_t
>>>> system_u:system_r:init_t root 1 0.6 0.0
>>>> 10368 712 ? Ss 04:17 0:00 init [3]
>>>>
>>>> system_u:system_r:init_t root 537 0.2 0.1
>>>> 13728 1976 ? S<s 04:17 0:00 /sbin/udevd -d
>>>> system_u:system_r:init_t root 1684 0.0 0.0
>>>> 38880 456 ? Ssl 04:18 0:00 brcm_iscsiuio
>>>> system_u:system_r:init_t root 1690 0.0 0.0
>>>> 12152 476 ? Ss 04:18 0:00 iscsid
>>>> system_u:system_r:init_t root 1691 0.0 0.4
>>>> 12648 4460 ? S<Ls 04:18 0:00 iscsid
>>>> system_u:system_r:init_t dbus 2081 0.0 0.1
>>>> 31520 1144 ? Ssl 04:18 0:00 dbus-daemon --system
>>>> system_u:system_r:init_t root 2215 0.0 0.1
>>>> 52372 1492 ? Ssl 04:18 0:00 automount
>>>> system_u:system_r:init_t root 2254 0.0 0.1
>>>> 62656 1212 ? Ss 04:18 0:00 /usr/sbin/sshd
>>>> system_u:system_r:init_t ntp 2273 0.0 0.4
>>>> 23412 5044 ? SLs 04:18 0:00 ntpd -u ntp:ntp -p
>>>> /var /run/ntpd.pid -g system_u:system_r:init_t root
>>>> 2287 0.1 1.0 253312 10580 ? Ss 04:18 0:00
>>>> /usr/sbin/httpd system_u:system_r:init_t apache
>>>> 2315 0.3 1.3 259488 13376 ? S 04:18 0:00
>>>> /usr/sbin/httpd system_u:system_r:init_t apache
>>>> 2316 0.0 1.0 257436 11124 ? S 04:18 0:00
>>>> /usr/sbin/httpd system_u:system_r:init_t apache
>>>> 2317 0.1 1.1 257436 11288 ? S 04:18 0:00
>>>> /usr/sbin/httpd system_u:system_r:init_t apache
>>>> 2318 0.1 1.1 257436 11292 ? S 04:18 0:00
>>>> /usr/sbin/httpd system_u:system_r:init_t apache
>>>> 2319 0.0 1.0 256720 10504 ? S 04:18 0:00
>>>> /usr/sbin/httpd system_u:system_r:init_t apache
>>>> 2320 0.1 1.0 257436 10752 ? S 04:18 0:00
>>>> /usr/sbin/httpd system_u:system_r:init_t apache
>>>> 2321 0.0 1.1 257436 11272 ? S 04:18 0:00
>>>> /usr/sbin/httpd system_u:system_r:init_t apache
>>>> 2322 0.1 1.1 257436 11356 ? S 04:18 0:00
>>>> /usr/sbin/httpd system_u:system_r:init_t root
>>>> 2386 0.0 0.0 3812 492 tty1 Ss+ 04:18 0:00
>>>> /sbin/mingetty tty1 system_u:system_r:init_t root
>>>> 2387 0.0 0.0 3812 488 tty2 Ss+ 04:18 0:00
>>>> /sbin/mingetty tty2 system_u:system_r:init_t root
>>>> 2390 0.0 0.0 3812 488 tty3 Ss+ 04:18 0:00
>>>> /sbin/mingetty tty3 system_u:system_r:init_t root
>>>> 2392 0.0 0.0 3812 492 tty4 Ss+ 04:18 0:00
>>>> /sbin/mingetty tty4 system_u:system_r:init_t root
>>>> 2394 0.0 0.0 3812 488 tty5 Ss+ 04:18 0:00
>>>> /sbin/mingetty tty5 system_u:system_r:init_t root
>>>> 2397 0.0 0.0 3812 488 tty6 Ss+ 04:18 0:00
>>>> /sbin/mingetty tty6 system_u:system_r:init_t apache
>>>> 2405 0.1 1.0 256412 11008 ? S 04:18 0:00
>>>> /usr/sbin/httpd system_u:system_r:init_t root
>>>> 2406 0.3 0.3 90156 3456 ? Ss 04:18 0:00 sshd:
>>>> root at pts/0 root:system_r:initrc_t:SystemLow-SystemHigh root
>>>> 2458 0.0 0.0 61176 768 pts/0 S+ 04:18 0:00 grep init_t
>>>>
>>>>
>>>>
>>>> I also found at least one file (the audit.log file) which has
>>>> file type file_t, even though I thought the filesystem had
>>>> been re-labeled successfully because /var/www/html/robots.txt
>>>> had the correct type:
>>>>
>>>> [root at g6950-21025 ~]# ls -lZ /var/www/html/robots.txt
>>>> -rw-rw-rw- root root system_u:object_r:httpd_sys_content_t
>>>> /var/www/html/robots.txt [root at g6950-21025 ~]# ls -lZ
>>>> /var/log/audit/audit.log -rw------- root root
>>>> system_u:object_r:file_t /var/log/audit/audit.log
>>>>
>>>>
>>>> Any idea (1) what could be causing that and (2) whether it
>>>> could be related to the problem with all those init_t
>>>> processes?
>>> It's easy : your init process is broken, all these daemons but
>>> init are mis-labeled, so all the files they create (such as log
>>> files) are mis-labeled.
>>>
>>> And if the next question is "how to fix it ?", the answer is
>>> easy too : "I don't have any clue..."
>>>
>>>
>> Assuming that httpd came from CentOS, it should be appropriate
>> relabeled. If not, using the semanage -f context would fix it.
> Are you talking about changing the security context on the
> /usr/sbin/httpd file itself? What should it be set to? Right now
> it's [root at g6950-21025 ~]# ls -lZ /usr/sbin/httpd -rwxr-xr-x root
> root system_u:object_r:file_t /usr/sbin/httpd
>
>> This requires some thought. I'll respond back later.
>>
>
> Thanks! _______________________________________________ CentOS
> mailing list CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
What does
restorecon -R -v /usr/sbin
Say?
If this changes the label, then execute
fixfiles restore
Which should relabel the system.
If restorecon does nothing or prints error messages,
What file system are you using?
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.11 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
iEYEARECAAYFAk8HD6EACgkQrlYvE4MpobNGOwCgl9VK72f8XQbQVhL7IPHu5J6l
kE4AoLBVPrjUduuboqfdgnNfEkrwMi2m
=//xT
-----END PGP SIGNATURE-----
More information about the CentOS
mailing list