vampire.m4: Load protocol-specific NAT helper modules.

[firewall] / vampire.m4

diff --git a/vampire.m4 b/vampire.m4
index f21009c..55c7961 100644 (file)
--- a/vampire.m4
+++ b/vampire.m4
@@ -67,22 +67,17 @@ allowservices inbound udp \
        gnutella_svc \
        i2p
 
-## Provide DNS resolution to local untrusted hosts.
-for p in tcp udp; do
-  run iptables -A inbound -j ACCEPT \
-         -s 172.29.198.0/24 \
-         -p $p --destination-port $port_dns
-done
+## Extend some services to local untrusted hosts.
+clearchain inbound-untrusted
+run iptables -A inbound -j inbound-untrusted \
+       -s 172.29.198.0/24
 
-## Allow smb and nmb to untrusted hosts.  This is a bit experimental.
-run iptables -A inbound -j ACCEPT \
-       -s 172.29.198.0/24 \
-       -p udp -m multiport --destination-ports \
-               $port_netbios_ns,$port_netbios_dgm
-run iptables -A inbound -j ACCEPT \
-       -s 172.29.198.0/24 \
-       -p tcp -m multiport --destination-ports \
-               $port_netbios_ssn,$port_microsoft_ds
+allowservices inbound-untrusted tcp \
+       dns \
+       netbios_ssn microsoft_ds
+allowservices inbound-untrusted udp \
+       dns \
+       tftp
 
 ## Provide syslog for evolution.
 run iptables -A inbound -j ACCEPT \
@@ -97,5 +92,31 @@ run iptables -A OUTPUT -m multiport \
 dnsresolver inbound
 ntpclient inbound $ntp_servers
 
+## NAT for RFC1918 addresses.
+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
+
+run iptables -t nat -N outbound
+run iptables -t nat -A outbound -j RETURN ! -o $if_dmz
+run iptables -t nat -A outbound -j RETURN ! -s 172.29.198.0/23
+run iptables -t nat -A outbound -j RETURN -d 62.49.204.144/28
+run iptables -t nat -A outbound -j RETURN -d 172.29.198.0/23
+run iptables -t nat -A outbound -j SNAT --to-source 62.49.204.158
+run iptables -t nat -A POSTROUTING -j outbound
+
+## Set up NAT protocol helpers.  In particular, SIP needs some special
+## twiddling.
+run modprobe nf_conntrack_sip \
+  ports=5060 \
+  sip_direct_signalling=0 \
+  sip_direct_media=0
+for p in ftp sip h323; do
+  run modprobe nf_nat_$p
+done
+
 m4_divert(-1)
 ###----- That's all, folks --------------------------------------------------