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#!/bin/sh -e
# Firewall setup script for Alpine Linux
# Copyright (C) 2018 Kaarle Ritvanen
. /lib/libalpine.sh
info() {
local obj=$1
shift
if [ "$1" ]; then
echo "Detected $obj:" $*
fi
}
is_running() {
busybox pgrep -x /usr/sbin/$1 > /dev/null
}
enable_policy() {
local pol=adp-$1
echo "Enabling policy $pol"
awall enable $pol
}
enable_if_running() {
local policy=$1
shift
for proc in $*; do
if is_running $proc; then
enable_policy $policy
return
fi
shift
done
}
list_to_json() {
local var=$1
eval set -- \$$var
echo -n "\"adp_$(echo $var | tr A-Z a-z)\": ["
local sep=" "
while [ "$1" ]; do
echo -n "$sep\"$1\""
sep=", "
shift
done
echo " ]"
}
WAN_IFACE=$(ip route | sed -E 's/^default .+ dev ([^ ]+)( .*)?$/\1/;ta;d;:a')
[ "$WAN_IFACE" ] || die "No default gateway"
info "WAN interface" $WAN_IFACE
DHCP_ZONES=
[ -f /var/run/udhcpc.$WAN_IFACE.pid ] && DHCP_ZONES=adp-wan
if is_running dhcpd; then
LAN_IFACES=$(. /etc/conf.d/dhcpd && echo $DHCPD_IFACE)
if [ -z "$LAN_IFACES" ]; then
for iface in $(ip -o address | \
sed -E 's/ scope host //;ta;s/^[0-9]+: ([^ ]+) .+/\1/;tb;:a;d;:b'); do
echo "$LAN_IFACES" | grep -q " $iface " || \
LAN_IFACES="$LAN_IFACES $iface "
done
fi
elif is_running udhcpd; then
LAN_IFACES=$(sed -E $'s/^interface( |\t)+(.+)$/\\2/;ta;d;:a' /etc/udhcpd.conf)
else
LAN_IFACES=
fi
LAN_IFACES=$(echo $(echo " $LAN_IFACES " | sed "s/ $WAN_IFACE //"))
LAN_ADDRS=
LAN_PRIVATE_ADDRS=
if [ "$LAN_IFACES" ]; then
for iface in $LAN_IFACES; do
for addr in $(ip -o address list dev $iface | \
sed -E 's/^[0-9]+: [^ ]+ +[^ ]+ ([^ ]+) .+$/\1/;ta;d;:a'); do
LAN_ADDRS="$LAN_ADDRS $addr"
LAN_PRIVATE_ADDRS="$LAN_PRIVATE_ADDRS $(echo $addr | \
sed -E 's/^((10|172\.(1[6-9]|2[0-9]|3[01])|192\.168)\.)/\1/;ta;d;:a')"
done
done
info "LAN interfaces" $LAN_IFACES
info "LAN addresses" $LAN_ADDRS
info "LAN private addresses" $LAN_PRIVATE_ADDRS
DHCP_ZONES="$DHCP_ZONES adp-lan"
enable_policy router
fi
if [ "$DHCP_ZONES" ]; then
info "DHCP zones" $DHCP_ZONES
enable_policy dhcp
fi
egrep "^https?://" /etc/apk/repositories && enable_policy web-client
enable_if_running ntp-client chronyd ntpd openntpd
enable_if_running ssh-server dropbear sshd
enable_policy ping
cat > /etc/awall/adp-config.json <<EOF
{
"variable": {
$(list_to_json DHCP_ZONES),
$(list_to_json LAN_ADDRS),
$(list_to_json LAN_IFACES),
$(list_to_json LAN_PRIVATE_ADDRS)
},
"zone": { "adp-wan": { "iface": "$WAN_IFACE" } }
}
EOF
awall translate
set_param() {
sed -Ei "s/^($2=).*\$/\\1$3/" /etc/conf.d/$1
}
enable_service() {
echo "Enabling service $1"
set_param $1 SAVE_ON_STOP no
if [ "$LAN_IFACES" ]; then
set_param IPFORWARD yes
fi
rc-update add $1
service $1 start
}
enable_service iptables
if ip -o address | egrep -q '^[0-9]+: [^ ]+ +inet6 '; then
enable_service ip6tables
fi
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