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Add IPv6 NAT support (#238)
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Stanislas
GitHub
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bfed14544e
@ -78,6 +78,7 @@ This fork includes the following features :
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- Better encryption, see below
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- Better DNS resolvers, see below
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- Choice between TCP and UDP (UDP is still recommended)
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- IPv6 (NATed) support
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- Run server in [unprivileged mode](https://github.com/Angristan/OpenVPN-install/blob/master/openvpn-install.sh#L426), reducing risks to the system
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- [Block DNS leak on Windows 10](https://community.openvpn.net/openvpn/ticket/605)
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- No comp-lzo, as [compression is a vector for oracle attacks, e.g. CRIME or BREACH](https://github.com/BetterCrypto/Applied-Crypto-Hardening/pull/91#issuecomment-75388575)
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@ -280,6 +280,9 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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iptables-save > $IPTABLES
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fi
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iptables -t nat -D POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
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if [[ "$IPV6" = 'y' ]]; then
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ip6tables -t nat -D POSTROUTING -o $NIC -s fd42:42:42:42::/112 -j MASQUERADE
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fi
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iptables-save > $IPTABLES
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if hash sestatus 2>/dev/null; then
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if sestatus | grep "Current mode" | grep -qs "enforcing"; then
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@ -357,6 +360,25 @@ else
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# Autodetect IP address and pre-fill for the user
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IP=$(ip addr | grep 'inet' | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1)
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read -rp "IP address: " -e -i $IP IP
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# If $IP is a private IP address, the server must be behind NAT
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if echo "$IP" | grep -qE '^(10\.|172\.1[6789]\.|172\.2[0-9]\.|172\.3[01]\.|192\.168)'; then
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echo ""
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echo "This server is behind NAT. What is the public IPv4 address or hostname?"
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read -rp "Public IP address / hostname: " -e PUBLICIP
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fi
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echo ""
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echo "Checking for IPv6 connectivity..."
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ping6 -c4 ipv6.google.com > /dev/null 2>&1;
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echo ""
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if [[ $? == 0 ]]; then
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echo "Your host appears to have IPv6 connectivity."
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else
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echo "Your host does not appear to have IPv6 connectivity."
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fi
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echo ""
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while [[ $IPV6 != "y" && $IPV6 != "n" ]]; do
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read -rp "Do you want to enable IPv6 support? [y/n]: " -e IPV6
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done
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echo ""
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echo "What port do you want for OpenVPN?"
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echo " 1) Default: 1194"
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@ -380,13 +402,6 @@ else
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echo "Random Port: $PORT"
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;;
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esac
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# If $IP is a private IP address, the server must be behind NAT
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if echo "$IP" | grep -qE '^(10\.|172\.1[6789]\.|172\.2[0-9]\.|172\.3[01]\.|192\.168)'; then
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echo ""
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echo "This server is behind NAT. What is the public IPv4 address or hostname?"
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read -rp "Public IP address / hostname: " -e PUBLICIP
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fi
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echo ""
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echo "What protocol do you want for OpenVPN?"
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echo "Unless UDP is blocked, you should not use TCP (unnecessarily slower)"
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@ -523,13 +538,14 @@ else
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read -n1 -r -p "Press any key to continue..."
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if [[ "$OS" = 'debian' ]]; then
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apt-get update
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apt-get install ca-certificates gnupg -y
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# We add the OpenVPN repo to get the latest version.
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# Debian 8
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if [[ "$VERSION_ID" = 'VERSION_ID="8"' ]]; then
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echo "deb http://build.openvpn.net/debian/openvpn/stable jessie main" > /etc/apt/sources.list.d/openvpn.list
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wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
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apt update
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apt-get update
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fi
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# Ubuntu 14.04
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if [[ "$VERSION_ID" = 'VERSION_ID="14.04"' ]]; then
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@ -658,7 +674,19 @@ WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
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# Generate server.conf
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echo "port $PORT" > /etc/openvpn/server.conf
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echo "proto $(echo $PROTOCOL | tr '[:upper:]' '[:lower:]')" >> /etc/openvpn/server.conf
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if [[ "$IPV6" = 'n' ]]; then
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if [[ "$PROTOCOL" = 'UDP' ]]; then
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echo "proto udp" >> /etc/openvpn/server.conf
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elif [[ "$PROTOCOL" = 'TCP' ]]; then
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echo "proto tcp" >> /etc/openvpn/server.conf
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fi
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elif [[ "$IPV6" = 'y' ]]; then
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if [[ "$PROTOCOL" = 'UDP' ]]; then
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echo "proto udp6" >> /etc/openvpn/server.conf
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elif [[ "$PROTOCOL" = 'TCP' ]]; then
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echo "proto tcp6" >> /etc/openvpn/server.conf
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fi
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fi
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echo "dev tun
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user nobody
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group $NOGROUP
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@ -721,8 +749,17 @@ ifconfig-pool-persist ipp.txt" >> /etc/openvpn/server.conf
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echo 'push "dhcp-option DNS 176.103.130.131"' >> /etc/openvpn/server.conf
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;;
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esac
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echo 'push "redirect-gateway def1 bypass-dhcp" ' >> /etc/openvpn/server.conf
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echo "crl-verify crl.pem
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echo 'push "redirect-gateway def1 bypass-dhcp" '>> /etc/openvpn/server.conf
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if [[ "$IPV6" = 'y' ]]; then
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echo 'server-ipv6 fd42:42:42:42::/112
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tun-ipv6
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push tun-ipv6
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push "route-ipv6 2000::/3"
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push "redirect-gateway ipv6"' >> /etc/openvpn/server.conf
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fi
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echo "crl-verify crl.pem
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ca ca.crt
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cert $SERVER_NAME.crt
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key $SERVER_NAME.key
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@ -744,18 +781,19 @@ mkdir -p /var/log/openvpn
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touch $SYSCTL
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fi
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# Enable net.ipv4.ip_forward for the system
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sed -i '/\<net.ipv4.ip_forward\>/c\net.ipv4.ip_forward=1' $SYSCTL
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if ! grep -q "\<net.ipv4.ip_forward\>" $SYSCTL; then
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echo 'net.ipv4.ip_forward=1' >> $SYSCTL
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# Enable routing
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echo 'net.ipv4.ip_forward=1' >> $SYSCTL
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if [[ "$IPV6" = 'y' ]]; then
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echo 'net.ipv6.conf.all.forwarding=1' >> $SYSCTL
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fi
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# Avoid an unneeded reboot
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echo 1 > /proc/sys/net/ipv4/ip_forward
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sysctl --system
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# Set NAT for the VPN subnet
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iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
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if [[ "$IPV6" = 'y' ]]; then
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ip6tables -t nat -A POSTROUTING -o $NIC -s fd42:42:42:42::/112 -j MASQUERADE
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fi
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# Save persitent iptables rules
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iptables-save > $IPTABLES
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@ -788,7 +826,19 @@ mkdir -p /var/log/openvpn
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# Save persitent OpenVPN rules
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iptables-save > $IPTABLES
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fi
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if [[ "$IPV6" = 'y' ]]; then
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if ip6tables -L -n | grep -qE 'REJECT|DROP'; then
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if [[ "$PROTOCOL" = 'UDP' ]]; then
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ip6tables -I INPUT -p udp --dport $PORT -j ACCEPT
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elif [[ "$PROTOCOL" = 'TCP' ]]; then
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ip6tables -I INPUT -p tcp --dport $PORT -j ACCEPT
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fi
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ip6tables -I FORWARD -s fd42:42:42:42::/112 -j ACCEPT
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ip6tables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
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# Save persitent OpenVPN rules
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iptables-save > $IPTABLES
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fi
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fi
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# If SELinux is enabled and a custom port was selected, we need this
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if hash sestatus 2>/dev/null; then
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if sestatus | grep "Current mode" | grep -qs "enforcing"; then
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