Re: [Non-DoD Source] Converting the filetrans_pattern interface into a CIL macro

On 10/20/19 4:29 AM, Daniel Skip wrote:
> Hello all. I have been playing with CIL on Selinux and have ran into a problem trying to convert the filetrans_pattern interface into a CIL macro.
> 
> The filetrans_pattern is as follows:
> 
> define(`filetrans_pattern',`
> 	allow $1 $2:dir rw_dir_perms;
> 	type_transition $1 $2:$4 $3 $5;
> ')
> 
> 
> 
> 
> I converted that into a CIL macro like so:
> 
> (macro filetrans_pattern ((type ARG1)(type ARG2)(type ARG3)(class
>      ARG4)(name ARG5))
>      (allow ARG1 ARG2 (dirs (rw)))
>      (typetransition ARG1 ARG2 ARG4 ARG3 ARG5))
> 
> 
> 
> 
> 
> So far so good. The issue is when I try to call the Macro it says I am missing an argument and the .cil policy won't build. Here is my call statement:
> 
> (call filetrans_pattern (example_t example_tmp_t dir))
> 
> 

There are a couple of problems.
First, you are calling the macro with only three arguments. Although the 
filename is optional for a typetransition rule, it is not in this case because 
CIL does not have optional arguments. If you do not want to specify a filename, 
then use "*".
Second, the typetransition rule should be "(typetransition ARG1 ARG2 ARG4 ARG5 
ARG3)"

It sounds like example_tmp_t is the result that you want. The second argument 
should be the type of the directory where the tmp directory is being created.

Jim


> 
> 
> I want it so that whenever I run my process type of example_t it will transition into the example_tmp_t and store any tmp files inside of my newly created example_tmp_t directory. I know I'm missing something but can't figure out what. Let me know what you think. Thanks!
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-- 
James Carter <[email protected]>
National Security Agency
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