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On 03/11/2017 08:56 AM, [email protected] wrote:
> I'm working on my 1st shorewall setup.
> 
> It's running on a 2 ethernet interface box, with a VPN connection
> too.
> 
> Reading the copious docs I got all that working \o/
> 
> Now I want to add a USB WiFi interface that will be used for only
> one purpose  -- as an AccessPoint for guests to access the EXTERNAL
> internet only.
> 
> I want to just allow them to login in (using hostapd) and get to
> the 'net.  Hostapd + dhcp gives them a 10.128.128.##/24 address on
> login.  Nothing else in my LAN will ever use that segment.
> 
> I want them to completely bypass all my internal LAN infrastructure
> -- no broadcast, no FW rules, etc.  All firewall-ing, dns, etc. I
> want them to worry about on their own -- and using external
> resources )e.g., NOT using my LAN dns).
> 
> I'd like to make sure that providing that access is a lightweight
> on my shorewall as possible.
> 
> So I _think_ I need to set this up as a DMZ.
> 
> So far, just based on reading & examples, I added this to my
> shorewall config
> 
> hosts wifi0      WIFI0_IF:10.128.128.0/24
> 
> zones wifi0 ipv4
> 
> params GUEST_WIFI0_IF=wlan0
> 
> interfaces wifi0   WIFI0_IF
> optional,physical=$GUEST_WIFI0_IF,dhcp,tcpflags,nosmurfs,logmartians=1,routefilter=1,sourceroute=0
>
>  Does that look about right?  I'm not sure if that's "overdone or
> underdone" :-/  The examples I found all seem to integrate the wifi
> INTO the lan -- I'm trying to make sure it AVOIDS the lan, and is
> just a "fast/lean pipe" to the net.  The "leave my LAN alone" part
> is what I'm most concerned about from a security perspective.  Not
> putting unneccessary load on my firewall would be nice too.
> 
> If the above is right, is there a MACRO that makes it simple for
> 
> rules
> 
> ?  Or is there a simple rule(s) that should do it?
> 

You don't need any rules. You just need policies:

net     wifiO   ACCEPT
wifiO   net     ACCEPT
all     wifiO   REJECT
wifiO   all     REJECT

And you don't need the hosts file entry either.

- -Tom
- -- 
Tom Eastep        \   Q: What do you get when you cross a mobster with
Shoreline,         \     an international standard?
Washington, USA     \ A: Someone who makes you an offer you can't
http://shorewall.net \________________________________________________
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