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Date: Wed, 5 Jul 2006 18:05:32 +0100
From: "mal content" <artifact.one@googlemail.com>
To: "Daan Vreeken [PA4DAN]" <Danovitsch@vitsch.net>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: Stop further socket() or connect() calls.
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On 05/07/06, Daan Vreeken [PA4DAN] <Danovitsch@vitsch.net> wrote:
> On Wednesday 05 July 2006 03:15, mal content wrote:
> > On 03/07/06, Peter Jeremy <peterjeremy@optushome.com.au> wrote:
> > > For dynamic executables, you could LD_PRELOAD a .so that replaces
> > > all the socket-related syscalls.
> >
> > Excellent suggestion! Ok, I've created a basic .so file with the following
> > code, but I've basically got stuck because I don't know how the original
> > syscalls are defined and can't find the definitions in the source:
> >
> > ---
> > #include <sys/syscall.h>
> > #include <sys/types.h>
> > #include <sys/socket.h>
> >
> > int socket(int d, int t, int prot)
> > {
> >   return __syscall(SYS_socket, d, t, prot);
> > }
> > [ ... ]
>
> Wouldn't this still allow a program to open sockets when the program does the
> __syscall() dance for itself instead of relying on socket() to work?
> I have never tried MAC myself, so correct me if I'm wrong, but I think
> something like this could be done using a modified version of mac_portacl(4).

Yes, it would. It's not meant as a security measure, more a sort of 'make this
app misbehave' for testing purposes. Seems to be working well anyway now.

MC