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Date: Thu, 19 Feb 2015 16:26:55 -0500
From: Thomas Hurd <thurd@tresys.com>
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Subject: Re: MCS error
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On 02/19/2015 03:48 PM, Dominick Grift wrote:
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> On Thu, Feb 19, 2015 at 11:33:37AM -0800, Tracy Reed wrote:
>> On Thu, Feb 19, 2015 at 07:40:48AM PST, Dominick Grift spake thusly:
>>> The MCS implementation has been changed a bit over the years on the policy side.
>> Is there a RHEL 6 version of the link I pasted below with up to date info?
>> Lack of documentation and frequent changes rendering documentation obsolete
>> combined with the inherent complexity of something like this are the main
>> issues holding back SELinux adoption.
>>
>>> Back in the earlier day's MCS was enforced on all proceses in redhat distro's by default
>> Yeah...I actually had it working in a test setup in RHEL 5 but never got it
>> deployed widely. Now we are trying to redo it with RHEl 6 and running into
>> issues.
>>
>>> Nowaday's that is no longer the case, and you need to opt-in for it by associating the mcs_constrained_type type attribute with the type of the process to constrain.
>>>
>>> In rhel6 this attribute name does not exist i suspect. It was renamed to aforementioned later.
>>>
>>> A seinfo -a | grep mcs might reveal the type attribute used for the same in RHEL6. (i think its something with trusted or untrusted, dunno for sure)
>> I don't follow this part... The seinfo output is:
>>
>> # seinfo -a | grep mcs
>> mcssetcats
>> mcswriteall
>> mcskillall
>> mcsreadall
>> mcsnetwrite
>> mcsuntrustedproc
>> mcsptraceall
>>
>> How do these type attributes relate to MCS?
> The mcstrustedproc type attribute makes a specified domain type mcs constrained.
>
> You can associate the attribute with a domain with the type_attribute statement:
>
> type_attribute type attribute
The typeattribute statement doesn't have an underscore. typeattribute 
and typealias don't have underscores but type_transition, type_member, 
and type_change do.
>
> so something like this (where the type associated with the app to constrain is "bla_t"
>
> sudo yum install selinux-policy-devel
>
> cat >> mytest.te <<EOF
> policy_module(mytest, 1.0,0)
> gen_require(` type bla_t; attribute mcsuntrustedproc; ')
> type_attribute bla_t mcsuntrustedproc;
> EOF
>
> make -f /usr/share/selinux/devel/Makefile mytest.pp
>
> sudo semodule -i mytest.pp
>
>> -- 
>> Tracy Reed
>
>
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>
> - -- 
> 02DFF788
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> Dominick Grift
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