Thank you for your comments.
George
On Sunday 15 May 2005 00:57, Arnaud Bergeron wrote:
> Sorry if this seems a bit out of order, because I commented as it came to
> me.
>
> On 5/13/05, GV <[EMAIL PROTECTED]> wrote:
> > Hi,
> >
> > I have following LAN configuration:
> >
> > [ COMP_1 ] ... [ COMP_n ]
> >
> > | | ADSL
> >
> > ---+------+-----+------- int_if [ OpenBSD ] ext_if -------- ( Internet
> > )
> >
> > "comp_1" ... "comp_n" are running a web base application and a number of
> > ports on each machine have to be accessible from the internet.
> >
> > I have the following pf.conf file which doesn't seem to work apart from
> > the redirection to port 80!:
> >
> > --------------------------
> > ext_if="vr0"
> > int_if="rl0"
> >
> > tcp_services = "{ 80, 20, 21, 22, 25, 110, 113 }"
> > cam_services = "{ 5000, 6000, 6001, 6002, 6005 }"
> > icmp_types = "echoreq"
> >
> > priv_nets = "{ 127.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8 }"
> >
> > cam1 = "192.168.1.33"
> >
> > set block-policy return
> > set loginterface $ext_if
> >
> > scrub in all
>
> You should change this :
> > nat on $ext_if from $int_if:network to any -> $ext_if
>
> to this:
>
> nat on $ext_if from $int_if:network to any -> ($ext_if)
>
> > rdr on $int_if proto tcp from any to any port 21 -> 127.0.0.1 port 8021
> > rdr pass on $ext_if proto tcp from any to any port 8000 -> $cam1 port 80
> >
> > block all
> > block in log all
> > pass quick on lo0 all
> >
> > block drop in quick on $ext_if from $priv_nets to any
>
> I think this line can cause problems as packets are blocked before
> they get nated.
> (I am not 100% sure on this one.)
>
> > block drop out quick on $ext_if from any to $priv_nets
> >
> > pass in on $ext_if inet proto tcp from any to ($ext_if) \
> > port $tcp_services flags S/SA keep state
>
> Non-paranoid rule:
>
> pass in on $ext_if proto tcp from any to any port $tcp_services flags
> S/SA keep state
>
> or "modulate state" at thge end.
>
> > pass in on $ext_if proto tcp from any to $cam1 port $cam_services keep
> > state
>
> If you want to redirect traffic to those ports ($cam_services) to the
> host cam1, this won't work. Use:
>
> rdr on $ext_if proto tcp form any to any port $cam_services -> $cam1
>
> Otherwise delete this rule as traffic destined to $cam1 will never
> arrive on $ext_if.
>
> > pass in inet proto icmp all icmp-type $icmp_types keep state
> >
> > pass in on $int_if from $int_if:network to any keep state
> > pass out on $int_if from any to $int_if:network keep state
>
> As a general rule, you don't need to be that paranoid about packet
> passing rules something like :
>
> pass on $int_if from any to any keep state
>
> will do the job. Of course, if you loose sleep over security you can
> always keep the ones you have.
>
> > pass out on $ext_if proto tcp all modulate state flags S/SA
>
> Same as above. There is no real need for "flags S/SA" on this rule
> unless your sleep hours require this.
>
> > pass out on $ext_if proto { udp, icmp } all keep state
> > ----------------------------------
> >
> > Thanks for your help
> >
> > George
