Title: RE: how to restrict a SOCK_RAW by interface
Sorry typo it was intended to be eth1.
I just checked again. Apol shows iface_test_t having 0 attributes and 0 rule match.
** # getenforce
** # cat selinuc/compat_net*
** # semanage interface -l
** SELinux Interface************* Context
** eth1************************** system_u
** # grep iface_test_t *.te
** type iface_test_t;
My app still can restart connect a socket to eth1 and read and write to eth1;
From: Stephen Smalley [mailto:email@example.com]
Sent: Wed 12/16/2009 9:02 AM
To: Cernak, James E (IS)
Subject: RE: how to restrict a SOCK_RAW by interface
On Mon, 2009-12-14 at 16:56 -0600, Cernak, James E (IS) wrote:
> Thanks for the hint, However it does not solve my problem I still can
> read from eth0.
eth0 or eth1?* Your example showed eth1 configured as iface_test_t.
> I did have to add allow rules for netif_t:netif but my policy still
> does not allow iface_test_t.
Hmmm..are you sure?* Did you declare any type attributes for
iface_test_t?* Use sesearch or apol to confirm that there are no allow
rules to it in the final binary policy.
> -----Original Message-----
> From: Stephen Smalley [mailto:firstname.lastname@example.org]
> Sent: Mon 12/14/2009 1:49 PM
> To: Cernak, James E (IS)
> Cc: email@example.com
> Subject: Re: how to restrict a SOCK_RAW by interface
> On Mon, 2009-12-14 at 13:29 -0600, Cernak, James E (IS) wrote:
> > Hello,
> > I am trying to restrict an application to using only some interfaces
> > on the system. I have defined a new type and assigned the interface
> > my RHEL5.4-x64 system to the new type with semanage. The system
> > indicates that the interface is now configured.
> >***** # semanage interface -l
> >***** SELinux Interface************* Context
> >***** eth1
> > This does restrict applications like tcpdump or wireshark from
> > the interface that was configured.
> >***** # tcpdump -D
> >***** 1.peth0
> >***** 2.virbr0
> >***** 3.vif0.0
> >***** 4.eth0
> >***** 5.xenbr0
> >***** 6.eth2
> >***** 7.eth3
> >***** 8.any (Pseudo-device that captures on all interfaces)
> >***** 9.lo
> > My problem comes that my application can still open eth1 and read
> > write packets to this interface.
> > The application is opening a socket as SOCK_RAW then binding with a
> > struct sockaddr_LL that has the ssll_ifindex field configured with
> > index of ETH1.
> > How do I write a selinux policy to restrict this application from
> > using some interfaces.
> In RHEL5 (Linux 2.6.18), you might need to enable compat_net (echo 1
> > /selinux/compat_net or boot with selinux_compat_net=1 on the kernel
> command line).
> Stephen Smalley
> National Security Agency
National Security Agency
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