Re: Any work in implementing Secure IPC for Linux?

[Chris Wright <chrisw@osdl.org>]

* Kristian S?rensen (ks@linnovative.dk) wrote:
> On Monday 09 May 2005 17:00, James Morris wrote:
> > On Mon, 9 May 2005, Kristian Sørensen wrote:
> > > Does anyone here know of work being done in order to implement secure IPC
> > > for Linux?
> >
> > What do you mean by secure IPC?
> As I understand it, presently the memory for the message queue is shared based 
> on user and group ownership of the process. By "secure IPC" is meaning a 
> security mechanism that provides a more fine granularity of specifying who 
> are allowed to send (or receive) messages... and maby also a way to resolve 
> the question of "Can I trust the message I received?"

There's hooks to handle this.  See the security blob in struct
kern_ipc_perm (which is embedded in the various SysV ipc structures),
and the associated security hooks to manage the labels and provide
access control to the ipc objects.  Also, AF_UNIX is handled with
security hooks (see the unix_ hooks).  From that point forward, it's up
to you to label and enforce access control.  SELinux has some supoort
for this type of access control.

thanks,
-chris
-- 
Linux Security Modules     http://lsm.immunix.org     http://lsm.bkbits.net
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