Re: antivirus_exec_t shunned on Fedora

On Fri, Jun 7, 2019 at 11:31 AM Marko Rauhamaa <[email protected]> wrote:

>
> I have a service I want to start from systemd. The service startup goes
> like this:
>
>    systemd ----> prog1[label: usr_t] ----> prog2[label: antivirus_exec_t]
>
> However, Fedora's SELinux policies prevent prog2 from starting. If I
> change prog2's label to bin_t or usr_t, the service starts fine.
>
> What in Fedora's policies bans antivirus_exec_t from running?
>
> Should I introduce a custom policy that allows that startup combination?
> If so, can you tell me what that rule would look like (or what document
> would give me the instructions). I already have a simple .te policy so I
> know the very basics.
>
> Or should I just label the file with bin_t and be done with it?
>
Hi Marko,

There is a type transition which makes a usr_t prog1 end up in
unconfined_service_t domain:

# sesearch -T -s init_t -t usr_t -c process
type_transition init_t usr_t:process unconfined_service_t;

but a transition from antivirus_exec_t is defined only for a bunch of
domains:

# sesearch -T -t antivirus_exec_t -c process
type_transition cluster_t antivirus_exec_t:process antivirus_t;
type_transition condor_startd_t antivirus_exec_t:process antivirus_t;
type_transition crond_t antivirus_exec_t:process antivirus_t;
type_transition exim_t antivirus_exec_t:process antivirus_t;
type_transition glusterd_t antivirus_exec_t:process antivirus_t;
type_transition httpd_sys_script_t antivirus_exec_t:process antivirus_t;
type_transition httpd_t antivirus_exec_t:process antivirus_t;
type_transition init_t antivirus_exec_t:process antivirus_t;
type_transition initrc_t antivirus_exec_t:process antivirus_t;
type_transition kdumpctl_t antivirus_exec_t:process antivirus_t;
type_transition mscan_t antivirus_exec_t:process antivirus_t;
type_transition openshift_initrc_t antivirus_exec_t:process antivirus_t;
type_transition piranha_pulse_t antivirus_exec_t:process antivirus_t;
type_transition procmail_t antivirus_exec_t:process antivirus_t;
type_transition system_cronjob_t antivirus_exec_t:process antivirus_t;


> BTW, this is not a sysadmin question. Rather it's a product installation
> question; the product should work out of the box on Fedora.
>
The proper way how to start a service is using a service unit, in that case
it works out of the box. We cannot however suggest any solution without
further information about your setup.


>
> Marko
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-- 

Zdenek Pytela
SELinux product owner and Senior software engineer, Security technologies
E-mail: [email protected], IRC: zpytela

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