On 05/18/2018 04:37 PM, m.roth@xxxxxxxxx wrote:
> Lukas Vrabec <lvrabec@xxxxxxxxxx> wrote:
>> On 05/17/2018 09:12 PM, m.roth@xxxxxxxxx wrote:
>>> As systems are upgraded, we're getting a ton of complaints
>>> (fortunately, we're in permissive mode) that would break everything.
>>> All of them involve rpc.gssd, and I see a number of bugs listed when I
>>> search.
>>>
>>> Note that I first saw this on a RHEL system, but now I'm seeing it on
>>> CentOS 7. I'm bringing it up here, because, given that there are
>>> multiple reported, that there's some bigger picture involving policy
>>> and rpc.gssd.
>>>
>>> I'll note that some of the reported bugs were *closed last year, or
>>> before, so it seems to me an old issue resurfaced.
>>>
>>> Example.
>>> SELinux is preventing /usr/sbin/rpc.gssd from using the block_suspend
>>> capability.
>>
>> While you won't send any logs, I'm not able to help you, but based on
>> our example, it looks like kernel bug affecting SELinux. Solution is to
>> dontaudit this SELinux denial.
>>
>> Also, what version of Centos 7 are you using? Centos 7.5?
>>
> One system is
> LSB Version: :core-4.1-amd64:core-4.1-noarch
> Distributor ID: RedHatEnterpriseWorkstation
> Description: Red Hat Enterprise Linux Workstation release 7.5 (Maipo)
> Release: 7.5
> Codename: Maipo
>
> Another is
> LSB Version: :core-4.1-amd64:core-4.1-noarch
> Distributor ID: CentOS
> Description: CentOS Linux release 7.5.1804 (Core)
> Release: 7.5.1804
> Codename: Core
>
> What logs do you usually want, the results of running sealert? From that,
> I see, on the CentOS 7.5 system:
> excerpt:
> Raw Audit Messages
> type=AVC msg=audit(1526626994.989:9622): avc: denied { block_suspend }
> for pid=901 comm="rpc.gssd" capability=36
> scontext=system_u:system_r:gssd_t:s0 tcontext=system_u:system_r:gssd_t:s0
> tclass=capability2
>
> And on the RHEL system:
> Raw Audit Messages
> type=AVC msg=audit(1526626926.76:162255): avc: denied { block_suspend }
> for pid=1218 comm="rpc.gssd" capability=36
> scontext=system_u:system_r:gssd_t:s0 tcontext=system_u:system_r:gssd_t:s0
> tclass=capability2
>
> So, same policy, and same denials. Note that the RHEL system is set for
> enforcing, while the CentOS system is permissive.
>
> mark
>
Hi Mark,
Workaround from my previous mail should fix your issue.
Lukas.
--
Lukas Vrabec
Software Engineer, Security Technologies
Red Hat, Inc.
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