From: Mark Wooding <mdw@distorted.org.uk>
Date: Wed, 26 Dec 2018 16:16:49 +0000 (+0000)
Subject: local.m4, precision.m4: Introduce `vpnnat' network class for nefarious hacks.
X-Git-Url: https://git.distorted.org.uk/~mdw/firewall/commitdiff_plain/1b1012475aa2ffe55ac358220c15c970cb49df4a

local.m4, precision.m4: Introduce `vpnnat' network class for nefarious hacks.

This allows hosts to route to the outside world via a remote VPN
endpoint, in order to work around local network problems or geographical
restrictions.
---

diff --git a/local.m4 b/local.m4
index 821cea9..f682680 100644
--- a/local.m4
+++ b/local.m4
@@ -110,11 +110,12 @@ m4_divert(-1)
 
 ## Define the available network classes.
 m4_divert(42)m4_dnl
-defnetclass scary	scary		trusted		    mcast
-defnetclass untrusted	scary untrusted trusted		    mcast
-defnetclass trusted	scary untrusted trusted safe noloop mcast
-defnetclass safe			trusted safe noloop mcast
-defnetclass noloop			trusted safe	    mcast
+defnetclass scary	scary		trusted		    vpnnat mcast
+defnetclass untrusted	scary untrusted trusted			   mcast
+defnetclass trusted	scary untrusted trusted safe noloop vpnnat mcast
+defnetclass safe			trusted safe noloop vpnnat mcast
+defnetclass noloop			trusted safe		   mcast
+defnetclass vpnnat	scary		trusted safe		   mcast
 
 defnetclass link
 defnetclass mcast
@@ -243,6 +244,7 @@ defnet hub virtual
 	via housebdry colobdry
 defnet sgo noloop
 	addr !172.29.198.0/23
+	addr !10.165.27.0/24
 	addr 10.0.0.0/8
 	addr 172.16.0.0/12
 	addr 192.168.0.0/16
@@ -274,13 +276,13 @@ defhost national
 	iface vpn-precision colohub
 
 ## Satellite networks.
-defnet binswood noloop
+defnet binswood vpnnat
 	addr 10.165.27.0/24
 	via colohub
 defhost mango
 	hosttype router
 	iface eth0 binswood default
-	iface vpn-precision colo
+	iface vpn-precision colo default
 
 m4_divert(80)m4_dnl
 ###--------------------------------------------------------------------------
diff --git a/precision.m4 b/precision.m4
index 598a990..2a07763 100644
--- a/precision.m4
+++ b/precision.m4
@@ -36,5 +36,17 @@ allowservices inbound udp \
 dnsresolver inbound
 dnsserver inbound
 
+## Nefarious VPN NAT hack.
+for i in PREROUTING OUTPUT POSTROUTING; do
+  run iptables -t nat -P $i ACCEPT 2>/dev/null || :
+  run iptables -t nat -F $i 2>/dev/null || :
+done
+run iptables -t nat -F
+run iptables -t nat -X
+makeset vpn-nat hash:net family inet
+run iptables -t nat -A POSTROUTING -o eth0 \
+	-m set --match-set vpn-nat dst \
+	-j SNAT --to-source 212.13.198.70
+
 m4_divert(-1)
 ###----- That's all, folks --------------------------------------------------