[ale] Write permission

[DJ-Pfulio]

Force the processes to run under a different userid that is locked down.
Users would use sudo to access that other account and launch the
program(s) with approved options only. Nothing else.  That user account
could have access to create an LV for all temporary data, if you wanted
to go crazy.  Just don't let their normal userids have access to the
temporary areas.

Are the programs developed in-house?  Hard to stop the devs from making
debug stuff write wherever they want.

On 05/16/16 10:48, Jim Kinney wrote:
> I'm trying to envision a process that will have some funky permissions
> in play and would appreciate ideas.
> 
> Data is sensitive and stored in encrypted partition. Only users in the
> approved group can read in that folder.
> 
> They need to run that data through custom code that may do temporary
> writes somewhere. That will need to be locked down and either encrypted
> or overwritten after use (or both). This is the easy part.
> 
> I need to prevent that data from being written/copied anywhere else even
> if they have write permission (home dir).
> 
> I run CentOS 7 systems so I have selinux. However, once this scales off
> the individual research system to the cluster, I've disabled selinux on
> the cluster for performance reasons. I can activate it if the encrypted
> folders are mounted and limit runs to specific nodes if always running.
> 
> So I'm seeing (sort of. Not fully thought out yet) a rule that allows
> data read with binaries of a particular type that can only write to
> particular folders. Note that the final output of the data run is not
> sensitive but intermediate data may be. To run a process requires
> writing binary to specific folder. That folder forces all contents to be
> special type that is subject to selinux rule.
> 
> Can't allow users to directly read the files in order to disallow 'cat
> file > newfile' to disallowed folder.
> 
> Data files are (currently) video and output is ascii text so it's
> possible to check file types on output before allowed to copy to new folder.
> 
> However, the input data files may be ascii for a different groups work.
> 
> 
> 
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