--- /dev/null
+# -*- shell-script -*-
+#
+# Configuration file for ferm(1).
+#
+# V: 0.1
+#
+# ferm manual: http://ferm.foo-projects.org/download/2.2/ferm.html
+# Blog post: https://blog.ipredator.se/linux-firewall-howto.html
+#
+
+# Really make sure that these modules exist and are loaded.
+@hook pre "/sbin/modprobe nf_conntrack_ftp";
+@hook pre "/sbin/modprobe nfnetlink_log";
+
+# Network interfaces.
+#@def $DEV_LAN = eth0;
+@def $DEV_LAN = ens3;
+@def $DEV_LOOPBACK = lo0;
+@def $DEV_VPN = wg0;
+
+# Network definition for the loopback device. This is needed to allow
+# DNS resolution on Ubuntu Linux where the local resolver is bound
+# to 127.0.1.1 - as opposed to the default 127.0.0.1.
+@def $NET_LOOPBACK = 127.0.0.0/8;
+
+# Common application ports.
+@def $PORT_DNS = 53;
+@def $PORT_FTP = ( 20 21 );
+@def $PORT_NTP = 123;
+@def $PORT_SSH = 22;
+@def $PORT_WEB = ( 80 443 );
+
+# The ports we allow to connect to.
+@def $PORT_WIREGUARD = ( 51820 );
+
+# See https://blog.ipredator.se/howto/restricting-transmission-to-the-vpn-interface-on-ubuntu-linux.html
+# Ports Transmission is allowed to use.
+@def $PORT_TRANSMISSION = 16384:65535;
+
+# Public DNS servers and those that are only reachable via VPN.
+# DNS servers are specified in the outbound DNS rules to prevent DNS leaks
+# (https://www.dnsleaktest.com/). The public DNS servers configured on your
+# system should be the IPredator ones (https://www.ipredator.se/page/services#service_dns),
+# but you need to verify this.
+#
+@def $IP_DNS_IPR_PUBLIC = ( 95.215.19.53/32 );
+
+# Add your ISP name server to this object if you want to restrict
+# which DNS servers can be queried.
+@def $IP_DNS_PUBLIC = 0.0.0.0/0;
+
+# DNS server available within the VPN.
+@def $IP_DNS_VPN = ( 95.215.19.53/32 );
+
+# Make sure to use the proper VPN interface (e.g. wg0 in this case).
+# Note: You cannot reference $DEV_VPN here, substition does not take
+# place for commands passed to a sub shell.
+@def $VPN_ACTIVE = `ip link show wg0 >/dev/null 2>/dev/null && echo 1 || echo`;
+
+# VPN interface conditional. If true the following rules are loaded.
+@if $VPN_ACTIVE {
+ domain ip {
+ table filter {
+ chain INPUT {
+ interface $DEV_VPN {
+ proto (tcp udp) dport $PORT_TRANSMISSION ACCEPT;
+ }
+ }
+ chain OUTPUT {
+ # Default allowed outbound services on the VPN interface.
+ # If you need more simply add your rules here.
+ outerface $DEV_VPN {
+ proto (tcp udp) daddr ( $IP_DNS_VPN $IP_DNS_IPR_PUBLIC ) dport $PORT_DNS ACCEPT;
+ proto tcp dport $PORT_FTP ACCEPT;
+ proto udp dport $PORT_NTP ACCEPT;
+ proto tcp dport $PORT_SSH ACCEPT;
+ proto (tcp udp) sport $PORT_TRANSMISSION ACCEPT;
+ proto tcp dport $PORT_WEB ACCEPT;
+ }
+ }
+ }
+ }
+}
+
+# The main IPv4 rule set.
+domain ip {
+ table filter {
+ chain INPUT {
+ # The default policy for the chain. Usually ACCEPT or DROP or REJECT.
+ policy DROP;
+
+ # Connection tracking.
+ mod state state INVALID DROP;
+ mod state state (ESTABLISHED RELATED) ACCEPT;
+
+ # Allow local traffic to loopback interface.
+ daddr $NET_LOOPBACK ACCEPT;
+
+ # Allow inbound SSH on your LAN interface _only_.
+ interface $DEV_LAN {
+ proto tcp dport $PORT_SSH ACCEPT;
+ }
+
+ # Respond to ping ... makes debugging easier.
+ proto icmp icmp-type echo-request ACCEPT;
+
+ # Log dropped packets.
+ NFLOG nflog-group 1;
+ DROP;
+ }
+
+ chain OUTPUT {
+ policy DROP;
+
+ # Connection tracking.
+ mod state state INVALID DROP;
+ mod state state (ESTABLISHED RELATED) ACCEPT;
+
+ # Allow local traffic from the loopback interface.
+ saddr $NET_LOOPBACK ACCEPT;
+
+ # Respond to ping.
+ proto icmp icmp-type echo-request ACCEPT;
+
+ # Allowed services on the LAN interface.
+ outerface $DEV_LAN {
+ proto (tcp udp) daddr $IP_DNS_PUBLIC dport $PORT_DNS ACCEPT;
+ proto udp dport $PORT_NTP ACCEPT;
+ proto (tcp udp) dport $PORT_WIREGUARD ACCEPT;
+ proto tcp dport $PORT_SSH ACCEPT;
+ }
+
+ # Log dropped packets.
+ NFLOG nflog-group 1;
+ DROP;
+ }
+
+ chain FORWARD {
+ policy DROP;
+
+ # If you use your machine to route traffic eg.
+ # from a VM you have to add rules here!
+
+ # Log dropped packets.
+ NFLOG nflog-group 1;
+ DROP;
+ }
+ }
+}
+
+# IPv6 is generally disabled, communication on the loopback device is allowed.
+domain ip6 {
+ table filter {
+ chain INPUT {
+ policy DROP;
+
+ # Allow local traffic.
+ interface $DEV_LOOPBACK ACCEPT;
+
+ # Log dropped packets.
+ NFLOG nflog-group 1;
+ DROP;
+ }
+ chain OUTPUT {
+ policy DROP;
+
+ # Log dropped packets.
+ NFLOG nflog-group 1;
+ DROP;
+ }
+ chain FORWARD {
+ policy DROP;
+
+ # Log dropped packets.
+ NFLOG nflog-group 1;
+ DROP;
+ }
+ }
+}
$DIRNAME/wireguard $HOSTNAME $DOMAIN $MIRROR
# Firewall
-#$APT_INSTALL ferm ulogd2 ulogd2-pcap
-#sudo cp $DIRNAME/files/njalla-wireguard/etc/ferm/ferm.conf /etc/ferm
-#sudo cp $DIRNAME/files/njalla-wireguard/etc/udev/rules.d/81-vpn-firewall.rules /etc/udev/rules.d
-#sudo cp $DIRNAME/files/njalla-wireguard/usr/local/bin/fermreload.sh /usr/local/bin
-#sudo chmod 555 /usr/local/bin/fermreload.sh
-#sudo sed -i -e 's/^ENABLED=.*$/ENABLED="yes"/' /etc/default/ferm
-#sudo service ferm restart
+$APT_INSTALL ferm ulogd2 ulogd2-pcap
+sudo cp $DIRNAME/files/njalla-wireguard/etc/ferm/ferm.conf /etc/ferm
+sudo cp $DIRNAME/files/njalla-wireguard/etc/udev/rules.d/81-vpn-firewall.rules /etc/udev/rules.d
+sudo cp $DIRNAME/files/njalla-wireguard/usr/local/bin/fermreload.sh /usr/local/bin
+sudo chmod 555 /usr/local/bin/fermreload.sh
+sudo sed -i -e 's/^ENABLED=.*$/ENABLED="yes"/' /etc/default/ferm
+sudo service ferm restart
# Njalla
echo "Please configure /etc/wireguard/ng0.conf"
projects / kvmx.git / commitdiff