[CentOS] SELinux and access across 'similar types'

[Philippe Naudin]

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..."

Sorry,

-- 
Philippe Naudin