[CentOS] SELinux and access across 'similar types'

Marko Vojinovic vvmarko at gmail.com
Sun Jan 8 13:10:09 UTC 2012

On Sunday 08 January 2012 04:31:05 Bennett Haselton wrote:
> [root at g6950-21025 ~]# ls -lZ /tmp/hostname_SKYSLICE.INFO
> -rw-r--r--  apache apache system_u:object_r:file_t
> /tmp/hostname_SKYSLICE.INFO
> [root at g6950-21025 ~]# restorecon -v /tmp/hostname_SKYSLICE.INFO
> [root at g6950-21025 ~]# ls -lZ /tmp/hostname_SKYSLICE.INFO
> -rw-r--r--  apache apache system_u:object_r:file_t
> /tmp/hostname_SKYSLICE.INFO
> [root at g6950-21025 ~]#


With this output I would say that your policy has been customized to have 
file_t as the default label for that file. Have you used audit2allow on that 
machine before the filesystem was properly relabeled?

I am not sure at this point, but I would say that your SELinux policy has been 
customized into an inconsistent state (since no file should have the type file_t 
by default, and yet restorecon says that this is the default label for that 
file). However, I don't know how to reset the customizations once they have 
been made (except for the brute force method).

I have never had any machine with SELinux in this kind of state, so I am a bit 
wary of giving you further advice on this matter. Also, you should probably 
start a new thread about this problem (quoting the above restorecon output and 
a brief history of the machine), since more eyeballs would be good in this 

As for the brute force method, it would go on the lines of

* disable SELinux
* reboot
* delete all policy files in /etc/selinux/
* reinstall selinux-policy-targeted via yum
* enable SELinux for the next reboot
* prepare the autorelabel
* reboot

The idea is to get you back to the CentOS default for both the policy and the 
file labels. However, there may be gotchas above or a more elegant way to 
restore the default policy, so someone else might chime in with a better 
advice (Dan?).

HTH, :-)

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