[Devel] Re: [RFC][patch 0/3] Network container subsystem - bind filtering

[Serge E. Hallyn]

Quoting dlezcano at fr.ibm.com (dlezcano at fr.ibm.com):
> Paul Menage mentionned, a few weeks ago, he wanted a bind filtering 
> for containers. Here it is  :) 
> 
> The following patches are a proposition to bring IP isolation to a container.
> 
> After looking more closely at the code I found that security hooks are
> at the right place to catch socket calls. The IP isolation relies on the
> security hooks and that has the advantage of not having the kernel code modified,
> (expect container.h and makefile/kconfig), the patchset provide just a new 
> file container_network.c
> 
> Roughly, a container has a subsystem for the network (only ipv4). 

Just curious - why ipv4 only?  When i wrote the bsdjail lsm, using the
same approach, doing ipv6 address was pretty simple.  Did something
change?  Or is ipv4 just a temporary restriction while you prototype?

> This subsystem contains the list of the addresses allowed to be used by the 
> container. If a container tries to bind to an address not contained into
> this list, the bind will fail with EPERM. Of course the bind is allowed to
> INADDR_ANY.
> 
> If this approach is ok for everyone, I can extend the bind filtering to
> consolidate the IP isolation.

You'll want to cc: the linux-security-module at vger.kernel.org list on
this patchset.

thanks,
-serge
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