[refpolicy] TCP server howto

Christopher J. PeBenito cpebenito at tresys.com
Thu Mar 5 08:23:02 CST 2009


On Mon, 2009-03-02 at 11:58 -0500, Daniel J Walsh wrote:
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> Jan Kasprzak wrote:
> > Dominick Grift wrote:
> > : I think corenet_reserved_port() is what you are looking for.
> > : 
> > 	Thanks for the hint. It is _almost_ exactly as you wrote,
> > except:
> > 
> > : # Declarations
> > : 
> > : type my_port_t;
> > : corenet_reserved_port(my_port_t)
> > : 
> > : # Policy
> > : 
> > : corenet_all_recvfrom_unlabeled($1)
> > : corenet_all_recvfrom_netlabel($1)
> > : corenet_tcp_sendrecv_generic_if($1)
> > : corenet_tcp_sendrecv_generic_node($1)
> > : corenet_tcp_sendrecv_all_ports($1)
> > - corenet_tcp_bind_generic_node($1)
> > + corenet_tcp_bind_inadrr_any_node($1)
> > 
> > : allow $1 my_port_t:tcp_socket name_bind;
> > 
> > + allow $1 self:capability net_bind_service;
> > + allow $1 self:tcp_socket create_stream_socket_perms;
> > 
> > : #EOF
> > : 
> > : sudo semanage port -a -t my_port_t -p tcp 40
> > 
> > 	I would however like to have a really-high-level macro (or two)
> > to do the above - I guess this is what many users would like to do
> > - saying "this context belongs to my port", and "this domain can run
> > a TCP server on this port". The similar way how the files_pid_file()
> > and files_pid_filetrans() macros allow for the
> > "I want to have my own PID file in /var/run" case.
> > 
> > 	Would it be acceptable to submit this as a patch for inclusion
> > in the upstream policy?
> > 
> > 	I would like to have other things included upstream as well - for
> > example, now I have a policy bits for Perl: file contexts for
> > /usr/bin/perl* and /usr/lib{,64}/perl5/*, and an interface macro for saying
> > "this domain can run Perl scripts".  
> > 
> > 	Thanks,
> > 
> > -Yenya
> > 
> 
> Yenya, take this discussion to the refpolicy list
> 
> <refpolicy at oss.tresys.com>
> 
> Better to discuss it there.  I think having a higher level template for
> creating a tcp or udp port would not be a bad idea.  See what upstream
> thinks.

I'm willing to consider it, but it'll need a good name.

-- 
Chris PeBenito
Tresys Technology, LLC
(410) 290-1411 x150



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