[CentOS] SELinux and access across 'similar types'
RILINDO FOSTER
rilindo at me.com
Fri Jan 6 13:55:37 UTC 2012
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.
This requires some thought. I'll respond back later.
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