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explictly ban unwanted forwardings in start_nat()

This commit is contained in:
garywill 2024-02-25 10:00:00 +08:00
parent 40872ebb9e
commit 8c9e16dd17
1 changed files with 37 additions and 11 deletions
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48
lnxrouter
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@ -1004,28 +1004,54 @@ iptb()
start_nat() {
local SUBNET_NET
local iv
if [[ $INTERNET_IFACE ]]; then
IPTABLES_NAT_OUT="-o ${INTERNET_IFACE}"
IPTABLES_NAT_IN="-i ${INTERNET_IFACE}"
MASQUERADE_NOTOUT=""
else
MASQUERADE_NOTOUT="! -o ${SUBNET_IFACE}"
fi
echo
echo "iptables: NAT "
for iv in "${IP_VERs[@]}"; do
[[ "$iv" -eq "4" && ! $NO4 -eq 0 ]] && continue
[[ "$iv" -eq "4" ]] && SUBNET_NET="$SUBNET_NET4"
[[ "$iv" -eq "6" ]] && SUBNET_NET="$SUBNET_NET6"
if [[ -n "$INTERNET_IFACE" ]]; then # only one Internet interface
# masquerade subnet -> internet
iptb "$iv" v nat I POSTROUTING -s "$SUBNET_NET" ! -d "$SUBNET_NET" \
-o "$INTERNET_IFACE" \
-j MASQUERADE || die
# forward subnet -> internet
iptb "$iv" v filter I FORWARD -i "$SUBNET_IFACE" -s "$SUBNET_NET" \
-o $INTERNET_IFACE \
-j ACCEPT || die
iptb "$iv" v filter I FORWARD -i "$SUBNET_IFACE" \
! -o $INTERNET_IFACE \
-j REJECT || die
iptb "$iv" v nat I POSTROUTING -s "$SUBNET_NET" $IPTABLES_NAT_OUT $MASQUERADE_NOTOUT ! -d "$SUBNET_NET" -j MASQUERADE || die
iptb "$iv" v filter I FORWARD -i "$SUBNET_IFACE" $IPTABLES_NAT_OUT -s "$SUBNET_NET" -j ACCEPT || die
iptb "$iv" v filter I FORWARD -o "$SUBNET_IFACE" $IPTABLES_NAT_IN -d "$SUBNET_NET" -j ACCEPT || die
# forward any -> subnet
iptb "$iv" v filter I FORWARD -o "$SUBNET_IFACE" -d "$SUBNET_NET" \
-i "$INTERNET_IFACE" \
-j ACCEPT || die
iptb "$iv" v filter I FORWARD -o "$SUBNET_IFACE" \
! -i "$INTERNET_IFACE" \
-j REJECT || die
else # any interface can be Internet
# masquerade subnet -> any(!subnet)
iptb "$iv" v nat I POSTROUTING -s "$SUBNET_NET" ! -d "$SUBNET_NET" \
! -o "$SUBNET_IFACE" \
-j MASQUERADE || die
# forward subnet -> any
iptb "$iv" v filter I FORWARD -i "$SUBNET_IFACE" -s "$SUBNET_NET" \
-j ACCEPT || die
# forward any -> subnet
iptb "$iv" v filter I FORWARD -o "$SUBNET_IFACE" -d "$SUBNET_NET" \
-j ACCEPT || die
fi
done
}