diff --git a/openvpn-install.sh b/openvpn-install.sh
new file mode 100755
index 0000000..bc593c0
--- /dev/null
+++ b/openvpn-install.sh
@@ -0,0 +1,419 @@
+#!/bin/bash
+# OpenVPN road warrior installer for Debian, Ubuntu and CentOS
+
+# This script will work on Debian, Ubuntu, CentOS and probably other distros
+# of the same families, although no support is offered for them. It isn't
+# bulletproof but it will probably work if you simply want to setup a VPN on
+# your Debian/Ubuntu/CentOS box. It has been designed to be as unobtrusive and
+# universal as possible.
+
+
+# Detect Debian users running the script with "sh" instead of bash
+if readlink /proc/$$/exe | grep -qs "dash"; then
+ echo "This script needs to be run with bash, not sh"
+ exit 1
+fi
+
+if [[ "$EUID" -ne 0 ]]; then
+ echo "Sorry, you need to run this as root"
+ exit 2
+fi
+
+if [[ ! -e /dev/net/tun ]]; then
+ echo "The TUN device is not available
+You need to enable TUN before running this script"
+ exit 3
+fi
+
+if grep -qs "CentOS release 5" "/etc/redhat-release"; then
+ echo "CentOS 5 is too old and not supported"
+ exit 4
+fi
+if [[ -e /etc/debian_version ]]; then
+ OS=debian
+ GROUPNAME=nogroup
+ RCLOCAL='/etc/rc.local'
+elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
+ OS=centos
+ GROUPNAME=nobody
+ RCLOCAL='/etc/rc.d/rc.local'
+else
+ echo "Looks like you aren't running this installer on Debian, Ubuntu or CentOS"
+ exit 5
+fi
+
+newclient () {
+ # Generates the custom client.ovpn
+ cp /etc/openvpn/client-common.txt ~/$1.ovpn
+ echo "" >> ~/$1.ovpn
+ cat /etc/openvpn/easy-rsa/pki/ca.crt >> ~/$1.ovpn
+ echo "" >> ~/$1.ovpn
+ echo "" >> ~/$1.ovpn
+ cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> ~/$1.ovpn
+ echo "" >> ~/$1.ovpn
+ echo "" >> ~/$1.ovpn
+ cat /etc/openvpn/easy-rsa/pki/private/$1.key >> ~/$1.ovpn
+ echo "" >> ~/$1.ovpn
+ echo "" >> ~/$1.ovpn
+ cat /etc/openvpn/ta.key >> ~/$1.ovpn
+ echo "" >> ~/$1.ovpn
+}
+
+# Try to get our IP from the system and fallback to the Internet.
+# I do this to make the script compatible with NATed servers (lowendspirit.com)
+# and to avoid getting an IPv6.
+IP=$(ip addr | grep 'inet' | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | grep -o -E '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1)
+if [[ "$IP" = "" ]]; then
+ IP=$(wget -4qO- "http://whatismyip.akamai.com/")
+fi
+
+if [[ -e /etc/openvpn/server.conf ]]; then
+ while :
+ do
+ clear
+ echo "Looks like OpenVPN is already installed"
+ echo ""
+ echo "What do you want to do?"
+ echo " 1) Add a new user"
+ echo " 2) Revoke an existing user"
+ echo " 3) Remove OpenVPN"
+ echo " 4) Exit"
+ read -p "Select an option [1-4]: " option
+ case $option in
+ 1)
+ echo ""
+ echo "Tell me a name for the client certificate"
+ echo "Please, use one word only, no special characters"
+ read -p "Client name: " -e -i client CLIENT
+ cd /etc/openvpn/easy-rsa/
+ ./easyrsa build-client-full $CLIENT nopass
+ # Generates the custom client.ovpn
+ newclient "$CLIENT"
+ echo ""
+ echo "Client $CLIENT added, configuration is available at" ~/"$CLIENT.ovpn"
+ exit
+ ;;
+ 2)
+ # This option could be documented a bit better and maybe even be simplimplified
+ # ...but what can I say, I want some sleep too
+ NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep -c "^V")
+ if [[ "$NUMBEROFCLIENTS" = '0' ]]; then
+ echo ""
+ echo "You have no existing clients!"
+ exit 6
+ fi
+ echo ""
+ echo "Select the existing client certificate you want to revoke"
+ tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
+ if [[ "$NUMBEROFCLIENTS" = '1' ]]; then
+ read -p "Select one client [1]: " CLIENTNUMBER
+ else
+ read -p "Select one client [1-$NUMBEROFCLIENTS]: " CLIENTNUMBER
+ fi
+ CLIENT=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$CLIENTNUMBER"p)
+ cd /etc/openvpn/easy-rsa/
+ ./easyrsa --batch revoke $CLIENT
+ ./easyrsa gen-crl
+ rm -rf pki/reqs/$CLIENT.req
+ rm -rf pki/private/$CLIENT.key
+ rm -rf pki/issued/$CLIENT.crt
+ rm -rf /etc/openvpn/crl.pem
+ cp /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn/crl.pem
+ # CRL is read with each client connection, when OpenVPN is dropped to nobody
+ chown nobody:$GROUPNAME /etc/openvpn/crl.pem
+ echo ""
+ echo "Certificate for client $CLIENT revoked"
+ exit
+ ;;
+ 3)
+ echo ""
+ read -p "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
+ if [[ "$REMOVE" = 'y' ]]; then
+ PORT=$(grep '^port ' /etc/openvpn/server.conf | cut -d " " -f 2)
+ PROTOCOL=$(grep '^proto ' /etc/openvpn/server.conf | cut -d " " -f 2)
+ if pgrep firewalld; then
+ IP=$(firewall-cmd --direct --get-rules ipv4 nat POSTROUTING | grep '\-s 10.8.0.0/24 '"'"'!'"'"' -d 10.8.0.0/24 -j SNAT --to ' | cut -d " " -f 10)
+ # Using both permanent and not permanent rules to avoid a firewalld reload.
+ firewall-cmd --zone=public --remove-port=$PORT/$PROTOCOL
+ firewall-cmd --zone=trusted --remove-source=10.8.0.0/24
+ firewall-cmd --permanent --zone=public --remove-port=$PORT/$PROTOCOL
+ firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
+ firewall-cmd --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
+ firewall-cmd --permanent --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
+ else
+ IP=$(grep 'iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to ' $RCLOCAL | cut -d " " -f 11)
+ iptables -t nat -D POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
+ sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 ! -d 10.8.0.0\/24 -j SNAT --to /d' $RCLOCAL
+ if iptables -L -n | grep -qE '^ACCEPT'; then
+ iptables -D INPUT -p $PROTOCOL --dport $PORT -j ACCEPT
+ iptables -D FORWARD -s 10.8.0.0/24 -j ACCEPT
+ iptables -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
+ sed -i "/iptables -I INPUT -p $PROTOCOL --dport $PORT -j ACCEPT/d" $RCLOCAL
+ sed -i "/iptables -I FORWARD -s 10.8.0.0\/24 -j ACCEPT/d" $RCLOCAL
+ sed -i "/iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT/d" $RCLOCAL
+ fi
+ fi
+ if hash sestatus 2>/dev/null; then
+ if sestatus | grep "Current mode" | grep -qs "enforcing"; then
+ if [[ "$PORT" != '1194' || "$PROTOCOL" = 'tcp' ]]; then
+ semanage port -d -t openvpn_port_t -p $PROTOCOL $PORT
+ fi
+ fi
+ fi
+ if [[ "$OS" = 'debian' ]]; then
+ apt-get remove --purge -y openvpn openvpn-blacklist
+ else
+ yum remove openvpn -y
+ fi
+ rm -rf /etc/openvpn
+ rm -rf /usr/share/doc/openvpn*
+ echo ""
+ echo "OpenVPN removed!"
+ else
+ echo ""
+ echo "Removal aborted!"
+ fi
+ exit
+ ;;
+ 4) exit;;
+ esac
+ done
+else
+ clear
+ echo 'Welcome to this quick OpenVPN "road warrior" installer'
+ echo ""
+ # OpenVPN setup and first user creation
+ echo "I need to ask you a few questions before starting the setup"
+ echo "You can leave the default options and just press enter if you are ok with them"
+ echo ""
+ echo "First I need to know the IPv4 address of the network interface you want OpenVPN"
+ echo "listening to."
+ read -p "IP address: " -e -i $IP IP
+ echo ""
+ echo "Which protocol do you want for OpenVPN connections?"
+ echo " 1) UDP (recommended)"
+ echo " 2) TCP"
+ read -p "Protocol [1-2]: " -e -i 1 PROTOCOL
+ case $PROTOCOL in
+ 1)
+ PROTOCOL=udp
+ ;;
+ 2)
+ PROTOCOL=tcp
+ ;;
+ esac
+ echo ""
+ echo "What port do you want OpenVPN listening to?"
+ read -p "Port: " -e -i 1194 PORT
+ echo ""
+ echo "Which DNS do you want to use with the VPN?"
+ echo " 1) Current system resolvers"
+ echo " 2) Google"
+ echo " 3) OpenDNS"
+ echo " 4) NTT"
+ echo " 5) Hurricane Electric"
+ echo " 6) Verisign"
+ read -p "DNS [1-6]: " -e -i 1 DNS
+ echo ""
+ echo "Finally, tell me your name for the client certificate"
+ echo "Please, use one word only, no special characters"
+ read -p "Client name: " -e -i client CLIENT
+ echo ""
+ echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now"
+ read -n1 -r -p "Press any key to continue..."
+ if [[ "$OS" = 'debian' ]]; then
+ apt-get update
+ apt-get install openvpn iptables openssl ca-certificates -y
+ else
+ # Else, the distro is CentOS
+ yum install epel-release -y
+ yum install openvpn iptables openssl wget ca-certificates -y
+ fi
+ # An old version of easy-rsa was available by default in some openvpn packages
+ if [[ -d /etc/openvpn/easy-rsa/ ]]; then
+ rm -rf /etc/openvpn/easy-rsa/
+ fi
+ # Get easy-rsa
+ wget -O ~/EasyRSA-3.0.1.tgz "https://github.com/OpenVPN/easy-rsa/releases/download/3.0.1/EasyRSA-3.0.1.tgz"
+ tar xzf ~/EasyRSA-3.0.1.tgz -C ~/
+ mv ~/EasyRSA-3.0.1/ /etc/openvpn/
+ mv /etc/openvpn/EasyRSA-3.0.1/ /etc/openvpn/easy-rsa/
+ chown -R root:root /etc/openvpn/easy-rsa/
+ rm -rf ~/EasyRSA-3.0.1.tgz
+ cd /etc/openvpn/easy-rsa/
+ # Create the PKI, set up the CA, the DH params and the server + client certificates
+ ./easyrsa init-pki
+ ./easyrsa --batch build-ca nopass
+ ./easyrsa gen-dh
+ ./easyrsa build-server-full server nopass
+ ./easyrsa build-client-full $CLIENT nopass
+ ./easyrsa gen-crl
+ # Move the stuff we need
+ cp pki/ca.crt pki/private/ca.key pki/dh.pem pki/issued/server.crt pki/private/server.key /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn
+ # CRL is read with each client connection, when OpenVPN is dropped to nobody
+ chown nobody:$GROUPNAME /etc/openvpn/crl.pem
+ # Generate key for tls-auth
+ openvpn --genkey --secret /etc/openvpn/ta.key
+ # Generate server.conf
+ echo "port $PORT
+proto $PROTOCOL
+dev tun
+sndbuf 0
+rcvbuf 0
+ca ca.crt
+cert server.crt
+key server.key
+dh dh.pem
+auth SHA512
+tls-auth ta.key 0
+topology subnet
+server 10.8.0.0 255.255.255.0
+ifconfig-pool-persist ipp.txt" > /etc/openvpn/server.conf
+ echo 'push "redirect-gateway def1 bypass-dhcp"' >> /etc/openvpn/server.conf
+ # DNS
+ case $DNS in
+ 1)
+ # Obtain the resolvers from resolv.conf and use them for OpenVPN
+ grep -v '#' /etc/resolv.conf | grep 'nameserver' | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | while read line; do
+ echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server.conf
+ done
+ ;;
+ 2)
+ echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server.conf
+ ;;
+ 3)
+ echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server.conf
+ ;;
+ 4)
+ echo 'push "dhcp-option DNS 129.250.35.250"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 129.250.35.251"' >> /etc/openvpn/server.conf
+ ;;
+ 5)
+ echo 'push "dhcp-option DNS 74.82.42.42"' >> /etc/openvpn/server.conf
+ ;;
+ 6)
+ echo 'push "dhcp-option DNS 64.6.64.6"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 64.6.65.6"' >> /etc/openvpn/server.conf
+ ;;
+ esac
+ echo "keepalive 10 120
+cipher AES-256-CBC
+comp-lzo
+user nobody
+group $GROUPNAME
+persist-key
+persist-tun
+status openvpn-status.log
+verb 3
+crl-verify crl.pem" >> /etc/openvpn/server.conf
+ # Enable net.ipv4.ip_forward for the system
+ sed -i '/\/c\net.ipv4.ip_forward=1' /etc/sysctl.conf
+ if ! grep -q "\" /etc/sysctl.conf; then
+ echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf
+ fi
+ # Avoid an unneeded reboot
+ echo 1 > /proc/sys/net/ipv4/ip_forward
+ if pgrep firewalld; then
+ # Using both permanent and not permanent rules to avoid a firewalld
+ # reload.
+ # We don't use --add-service=openvpn because that would only work with
+ # the default port and protocol.
+ firewall-cmd --zone=public --add-port=$PORT/$PROTOCOL
+ firewall-cmd --zone=trusted --add-source=10.8.0.0/24
+ firewall-cmd --permanent --zone=public --add-port=$PORT/$PROTOCOL
+ firewall-cmd --permanent --zone=trusted --add-source=10.8.0.0/24
+ # Set NAT for the VPN subnet
+ firewall-cmd --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
+ firewall-cmd --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
+ else
+ # Needed to use rc.local with some systemd distros
+ if [[ "$OS" = 'debian' && ! -e $RCLOCAL ]]; then
+ echo '#!/bin/sh -e
+exit 0' > $RCLOCAL
+ fi
+ chmod +x $RCLOCAL
+ # Set NAT for the VPN subnet
+ iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
+ sed -i "1 a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP" $RCLOCAL
+ if iptables -L -n | grep -qE '^(REJECT|DROP)'; then
+ # If iptables has at least one REJECT rule, we asume this is needed.
+ # Not the best approach but I can't think of other and this shouldn't
+ # cause problems.
+ iptables -I INPUT -p $PROTOCOL --dport $PORT -j ACCEPT
+ iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
+ iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
+ sed -i "1 a\iptables -I INPUT -p $PROTOCOL --dport $PORT -j ACCEPT" $RCLOCAL
+ sed -i "1 a\iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT" $RCLOCAL
+ sed -i "1 a\iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" $RCLOCAL
+ fi
+ fi
+ # If SELinux is enabled and a custom port or TCP was selected, we need this
+ if hash sestatus 2>/dev/null; then
+ if sestatus | grep "Current mode" | grep -qs "enforcing"; then
+ if [[ "$PORT" != '1194' || "$PROTOCOL" = 'tcp' ]]; then
+ # semanage isn't available in CentOS 6 by default
+ if ! hash semanage 2>/dev/null; then
+ yum install policycoreutils-python -y
+ fi
+ semanage port -a -t openvpn_port_t -p $PROTOCOL $PORT
+ fi
+ fi
+ fi
+ # And finally, restart OpenVPN
+ if [[ "$OS" = 'debian' ]]; then
+ # Little hack to check for systemd
+ if pgrep systemd-journal; then
+ systemctl restart openvpn@server.service
+ else
+ /etc/init.d/openvpn restart
+ fi
+ else
+ if pgrep systemd-journal; then
+ systemctl restart openvpn@server.service
+ systemctl enable openvpn@server.service
+ else
+ service openvpn restart
+ chkconfig openvpn on
+ fi
+ fi
+ # Try to detect a NATed connection and ask about it to potential LowEndSpirit users
+ EXTERNALIP=$(wget -4qO- "http://whatismyip.akamai.com/")
+ if [[ "$IP" != "$EXTERNALIP" ]]; then
+ echo ""
+ echo "Looks like your server is behind a NAT!"
+ echo ""
+ echo "If your server is NATed (e.g. LowEndSpirit), I need to know the external IP"
+ echo "If that's not the case, just ignore this and leave the next field blank"
+ read -p "External IP: " -e USEREXTERNALIP
+ if [[ "$USEREXTERNALIP" != "" ]]; then
+ IP=$USEREXTERNALIP
+ fi
+ fi
+ # client-common.txt is created so we have a template to add further users later
+ echo "client
+dev tun
+proto $PROTOCOL
+sndbuf 0
+rcvbuf 0
+remote $IP $PORT
+resolv-retry infinite
+nobind
+persist-key
+persist-tun
+remote-cert-tls server
+auth SHA512
+cipher AES-256-CBC
+comp-lzo
+setenv opt block-outside-dns
+key-direction 1
+verb 3" > /etc/openvpn/client-common.txt
+ # Generates the custom client.ovpn
+ newclient "$CLIENT"
+ echo ""
+ echo "Finished!"
+ echo ""
+ echo "Your client configuration is available at" ~/"$CLIENT.ovpn"
+ echo "If you want to add more clients, you simply need to run this script again!"
+fi
diff --git a/openvpn.sh b/openvpn.sh
new file mode 100755
index 0000000..c434478
--- /dev/null
+++ b/openvpn.sh
@@ -0,0 +1,2 @@
+openvpn --config ~/linux.ovpn
+ip route add default dev tun0