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Re: firewall



Jonathan Ben-Avraham wrote:

> On Tue, 9 Dec 1997, Erez Doron wrote:
>
> > Jonathan Ben-Avraham wrote:
> >
> > > On Mon, 8 Dec 1997, Erez Doron wrote:
> > >
> > > > Hi
> > > >  I've just compiled my kerenel as firewall
> > > > ( selected firewall, and no ip-forwarding)
> > > > id there a way to tell inetd to listen to one interface and not to
> > > > another ?
> > > >
> > > Note that although it listens to both, it does not pass packets between
> > > the interfaces. That is, from either interface you can ping the other but
> > > you cannot pass packets to it. This is pretty deep in IP, I don't see how
> > > you can change it without hacking the code.
> > >
> >   the reason i ask this is because i want to be able to telnet the firwall
> >   from inside and not from outside.
> >
> > regards
> > Erez.
> >
> >
> This is not an IP problem. You need to set this up in /etc/hosts.deny like
> this:
>
> in.telnetd: ALL
>
> and in /etc/hosts.allow like this:
>
> in.telnetd: my_inside_host
>
> Don't forget to kick (kill -HUP) inetd after you change the /etc/hosts.
> files.
> Cheers,
>
>  - yba
>
>    EE 77 7F 30 4A 64 2E C5  83 5F E7 49 A6 82 29 BA    ~. .~   TclTek Ltd.
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>   - benavrhm@tcltek.co.il - tel: +972.52.670.353, http://www.tcltek.co.il -

  telnet was just an example, i wanted also squid, ftp finger talk nfs ...
  to be accessed from inside.
  not all are accessed via inetd.

  I'm looking for a global way to set all thease utils to be able to be accesed
  only from one interface.

to count only on host.allow and host.deny is a securiry hole because someone can

impersonate a local computer which is allowed, and get acess.


is  there a way to make any program only to be able to be accessed only from one
interface ?


regards
Erez.