Re: Configuration testing vs Forensic testing

[Steve Grubb]

On Friday, October 31, 2014 12:51:04 PM Jan Lieskovsky wrote:
> ----- Original Message -----
> > From: "Steve Grubb" 
> > To: [e-mail]
> > Sent: Friday, October 31, 2014 3:55:29 PM
> > Subject: Re: Configuration testing vs Forensic testing
> >
> > On Friday, October 31, 2014 10:47:37 AM Shawn Wells wrote:
> > > On 10/31/14, 10:31 AM, Steve Grubb wrote:
> > > > I think there is a problem in the SSG content. I think that the
> > > > current
> > > > content is intended to check the system configuration. This would be
> > > > done
> > > > by examining the files on disk to warn about changes or thing that are
> > > > misconfigured. There is also another category of testing that is
> > > > forensics which checks the ephemeral / current values being enforced.
> > > > Both are necessary and useful, but they should not be mixed.
> >
> > <snip>
> > > I've opened tickets to track mount vs fstab, sysctl, and service vs
> > > chkconfig:
> >
> > Thanks!
> > > As/if you identify additional sections which need better separation,
> > > please bring them to our attention!
> >
> > Well, in a very brief look, the selinux label check in /dev is wrong, it
> > should be:
> >
> > find /dev -context *:device_t:* ( -type c -o -type b )
>
> Just out-of-curiosity this doesn't seem to be working properly (or
> I am missing something obvious) [*]. E.g. sample output from RHEL-6 system:

Something got snipped. Should have been:

find /dev -context *:device_t:* ( -type c -o -type b ) -printf "%p %Z\n"
> [root@localhost ~]# cat /etc/redhat-release
> Red Hat Enterprise Linux Server release 6.6 (Santiago)
> [root@localhost ~]# ls -Z /dev/null
> crw-rw-rw-. root root system_u:object_r:null_device_t:s0 /dev/null
> [root@localhost ~]# chcon -t samba_share_t /dev/null
> [root@localhost ~]# ls -Z /dev/null
> crw-rw-rw-. root root system_u:object_r:samba_share_t:s0 /dev/null
> [root@localhost ~]# find /dev -context *:device_t:* ( -type c -o -type b )
> [root@localhost ~]# find /dev -context *:device_t:* ( -type c -o -type b
> ) | wc -l 0
>
> Shouldn't it be changed to e.g.:
>
> find /dev ! -context *:*device_t:* ( -type c -o -type b )
>
> to get the list of devices that are not of :*_device_t: target?

device_t is the default when selinux knows nothing about the device. You want 
your system to have none of these.

-Steve