tor_t: actually allowed tcp ports

[Lukas Vrabec]

On 04/10/2015 04:13 PM, Nusenu wrote:
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>>>>> what are the actually allowed TCP ports processes in the
>>>>> tor_t domain are allowed to bind to? (with
>>>>> tor_bind_all_unreserved_ports --> off tor_can_network_relay
>>>>> --> on)
>>>>>
>>>>>
>>>>> semanage gives me: tor_port_t         tcp      6969, 9001,
>>>>> 9030, 9050, 9051, 9150
>>>>>
>>>>> but tor can bind to 80,443 or 9000 without problems. (but
>>>>> for example 5000 is not allowed -> AVCs)
>>> If you need some custom port for tor binding and you won't use
>>> 'tor_bind_all_unreserved_ports' boolean, you could use semanage
>>> tool to label your custom port as tor_port_t. Example: |semanage
>>> port -a -t tor_port_t -p tcp 5000
> That sounds great to allow it to run without allowing more than
> needed, unfortunately it does not work for every port:
>
> ValueError: Port tcp/5000 already defined
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Hi,
If you need to bind on defined port, there is a way to make "local" 
policy with rule allowing this.
To build local policy follow this:
     1. Generate AVC (in your case tor is binding to port 5000)
     2. Store this AVC in some file. (like tor_local.txt)
     3. use: $ cat ./tor_local.txt | audit2allow -M tor_local
     4. use: # semodule -i tor_local.pp

Now tor_t domain can bind to port 5000.

Last thing, be careful with this. Make local policies when you know what 
you are allowing due to security reasons.

-- 

Thank you.

--
Lukas Vrabec
SELinux Solutions
Red Hat, Inc.