347 lines
12 KiB
Bash
347 lines
12 KiB
Bash
#!/bin/bash
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# OpenVPN road warrior installer for Debian, Ubuntu and CentOS
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# This script will work on Debian, Ubuntu, CentOS and probably other distros
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# of the same families, although no support is offered for them. It isn't
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# bulletproof but it will probably work if you simply want to setup a VPN on
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# your Debian/Ubuntu/CentOS box. It has been designed to be as unobtrusive and
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# universal as possible.
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if [[ "$USER" != 'root' ]]; then
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echo "Sorry, you need to run this as root"
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exit
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fi
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if [[ ! -e /dev/net/tun ]]; then
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echo "TUN/TAP is not available"
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exit
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fi
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if grep -qs "CentOS release 5" "/etc/redhat-release"; then
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echo "CentOS 5 is too old and not supported"
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exit
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fi
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if [[ -e /etc/debian_version ]]; then
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OS=debian
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RCLOCAL='/etc/rc.local'
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elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
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OS=centos
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RCLOCAL='/etc/rc.d/rc.local'
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# Needed for CentOS 7
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chmod +x /etc/rc.d/rc.local
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else
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echo "Looks like you aren't running this installer on a Debian, Ubuntu or CentOS system"
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exit
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fi
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newclient () {
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# Generates the client.ovpn
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cp /usr/share/doc/openvpn*/*ample*/sample-config-files/client.conf ~/$1.ovpn
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sed -i "/ca ca.crt/d" ~/$1.ovpn
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sed -i "/cert client.crt/d" ~/$1.ovpn
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sed -i "/key client.key/d" ~/$1.ovpn
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echo "<ca>" >> ~/$1.ovpn
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cat /etc/openvpn/easy-rsa/2.0/keys/ca.crt >> ~/$1.ovpn
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echo "</ca>" >> ~/$1.ovpn
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echo "<cert>" >> ~/$1.ovpn
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cat /etc/openvpn/easy-rsa/2.0/keys/$1.crt >> ~/$1.ovpn
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echo "</cert>" >> ~/$1.ovpn
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echo "<key>" >> ~/$1.ovpn
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cat /etc/openvpn/easy-rsa/2.0/keys/$1.key >> ~/$1.ovpn
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echo "</key>" >> ~/$1.ovpn
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}
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# Try to get our IP from the system and fallback to the Internet.
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# I do this to make the script compatible with NATed servers (lowendspirit.com)
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# and to avoid getting an IPv6.
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IP=$(ip addr | grep 'inet' | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | grep -o -E '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1)
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if [[ "$IP" = "" ]]; then
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IP=$(wget -qO- ipv4.icanhazip.com)
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fi
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if [[ -e /etc/openvpn/server.conf ]]; then
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while :
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do
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clear
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echo "Looks like OpenVPN is already installed"
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echo ""
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echo "What do you want to do?"
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echo " 1) Add a cert for a new user"
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echo " 2) Revoke existing user cert"
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echo " 3) Remove OpenVPN"
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echo " 4) Exit"
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read -p "Select an option [1-4]: " option
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case $option in
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1)
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echo ""
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echo "Tell me a name for the client cert"
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echo "Please, use one word only, no special characters"
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read -p "Client name: " -e -i client CLIENT
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cd /etc/openvpn/easy-rsa/2.0/
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source ./vars
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# build-key for the client
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export KEY_CN="$CLIENT"
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export EASY_RSA="${EASY_RSA:-.}"
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"$EASY_RSA/pkitool" $CLIENT
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# Generate the client.ovpn
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newclient "$CLIENT"
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echo ""
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echo "Client $CLIENT added, certs available at ~/$CLIENT.ovpn"
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exit
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;;
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2)
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# This option could be documented a bit better and maybe even be simplimplified
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# ...but what can I say, I want some sleep too
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NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/easy-rsa/2.0/keys/index.txt | grep "^V" | wc -l)
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if [[ "$NUMBEROFCLIENTS" = '0' ]]; then
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echo ""
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echo "You have no existing clients!"
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exit
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fi
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echo ""
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echo "Select the existing client certificate you want to revoke"
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tail -n +2 /etc/openvpn/easy-rsa/2.0/keys/index.txt | grep "^V" | cut -d '/' -f 7 | cut -d '=' -f 2 | nl -s ') '
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if [[ "$NUMBEROFCLIENTS" = '1' ]]; then
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read -p "Select one client [1]: " CLIENTNUMBER
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else
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read -p "Select one client [1-$NUMBEROFCLIENTS]: " CLIENTNUMBER
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fi
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CLIENT=$(tail -n +2 /etc/openvpn/easy-rsa/2.0/keys/index.txt | grep "^V" | cut -d '/' -f 7 | cut -d '=' -f 2 | sed -n "$CLIENTNUMBER"p)
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cd /etc/openvpn/easy-rsa/2.0/
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. /etc/openvpn/easy-rsa/2.0/vars
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. /etc/openvpn/easy-rsa/2.0/revoke-full $CLIENT
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# If it's the first time revoking a cert, we need to add the crl-verify line
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if ! grep -q "crl-verify" "/etc/openvpn/server.conf"; then
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echo "crl-verify /etc/openvpn/easy-rsa/2.0/keys/crl.pem" >> "/etc/openvpn/server.conf"
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# And restart
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if pgrep systemd-journal; then
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systemctl restart openvpn@server.service
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else
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if [[ "$OS" = 'debian' ]]; then
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/etc/init.d/openvpn restart
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else
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service openvpn restart
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fi
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fi
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fi
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echo ""
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echo "Certificate for client $CLIENT revoked"
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exit
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;;
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3)
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echo ""
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read -p "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
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if [[ "$REMOVE" = 'y' ]]; then
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if [[ "$OS" = 'debian' ]]; then
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apt-get remove --purge -y openvpn openvpn-blacklist
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else
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yum remove openvpn -y
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fi
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rm -rf /etc/openvpn
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rm -rf /usr/share/doc/openvpn*
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sed -i '/--dport 53 -j REDIRECT --to-port/d' $RCLOCAL
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sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0/d' $RCLOCAL
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echo ""
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echo "OpenVPN removed!"
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else
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echo ""
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echo "Removal aborted!"
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fi
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exit
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;;
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4) exit;;
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esac
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done
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else
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clear
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echo 'Welcome to this quick OpenVPN "road warrior" installer'
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echo ""
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# OpenVPN setup and first user creation
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echo "I need to ask you a few questions before starting the setup"
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echo "You can leave the default options and just press enter if you are ok with them"
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echo ""
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echo "First I need to know the IPv4 address of the network interface you want OpenVPN"
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echo "listening to."
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read -p "IP address: " -e -i $IP IP
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echo ""
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echo "What port do you want for OpenVPN?"
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read -p "Port: " -e -i 1194 PORT
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echo ""
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echo "Do you want OpenVPN to be available at port 53 too?"
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echo "This can be useful to connect under restrictive networks"
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read -p "Listen at port 53 [y/n]: " -e -i n ALTPORT
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echo ""
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echo "Do you want to enable internal networking for the VPN?"
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echo "This can allow VPN clients to communicate between them"
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read -p "Allow internal networking [y/n]: " -e -i n INTERNALNETWORK
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echo ""
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echo "What DNS do you want to use with the VPN?"
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echo " 1) Current system resolvers"
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echo " 2) OpenDNS"
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echo " 3) Level 3"
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echo " 4) NTT"
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echo " 5) Hurricane Electric"
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echo " 6) Yandex"
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read -p "DNS [1-6]: " -e -i 1 DNS
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echo ""
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echo "Finally, tell me your name for the client cert"
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echo "Please, use one word only, no special characters"
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read -p "Client name: " -e -i client CLIENT
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echo ""
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echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now"
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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 openvpn iptables openssl -y
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else
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# Else, the distro is CentOS
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yum install epel-release -y
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yum install openvpn iptables openssl wget -y
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fi
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# An old version of easy-rsa was available by default in some openvpn packages
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if [[ -d /etc/openvpn/easy-rsa/2.0/ ]]; then
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rm -f /etc/openvpn/easy-rsa/2.0/
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fi
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# Get easy-rsa
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wget --no-check-certificate -O ~/easy-rsa.tar.gz https://github.com/OpenVPN/easy-rsa/archive/2.2.2.tar.gz
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tar xzf ~/easy-rsa.tar.gz -C ~/
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mkdir -p /etc/openvpn/easy-rsa/2.0/
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cp ~/easy-rsa-2.2.2/easy-rsa/2.0/* /etc/openvpn/easy-rsa/2.0/
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rm -rf ~/easy-rsa-2.2.2
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rm -rf ~/easy-rsa.tar.gz
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cd /etc/openvpn/easy-rsa/2.0/
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# Let's fix one thing first...
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cp -u -p openssl-1.0.0.cnf openssl.cnf
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# Create the PKI
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. /etc/openvpn/easy-rsa/2.0/vars
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. /etc/openvpn/easy-rsa/2.0/clean-all
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# The following lines are from build-ca. I don't use that script directly
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# because it's interactive and we don't want that. Yes, this could break
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# the installation script if build-ca changes in the future.
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export EASY_RSA="${EASY_RSA:-.}"
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"$EASY_RSA/pkitool" --initca $*
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# Same as the last time, we are going to run build-key-server
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export EASY_RSA="${EASY_RSA:-.}"
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"$EASY_RSA/pkitool" --server server
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# Now the client keys. We need to set KEY_CN or the stupid pkitool will cry
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export KEY_CN="$CLIENT"
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export EASY_RSA="${EASY_RSA:-.}"
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"$EASY_RSA/pkitool" $CLIENT
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# DH params
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. /etc/openvpn/easy-rsa/2.0/build-dh
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# Let's configure the server
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cd /usr/share/doc/openvpn*/*ample*/sample-config-files
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if [[ "$OS" = 'debian' ]]; then
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gunzip -d server.conf.gz
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fi
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cp server.conf /etc/openvpn/
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cd /etc/openvpn/easy-rsa/2.0/keys
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cp ca.crt ca.key dh2048.pem server.crt server.key /etc/openvpn
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cd /etc/openvpn/
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# Set the server configuration
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sed -i 's|dh dh1024.pem|dh dh2048.pem|' server.conf
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sed -i 's|;push "redirect-gateway def1 bypass-dhcp"|push "redirect-gateway def1 bypass-dhcp"|' server.conf
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sed -i "s|port 1194|port $PORT|" server.conf
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# DNS
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case $DNS in
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1)
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# Obtain the resolvers from resolv.conf and use them for OpenVPN
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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
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sed -i "/;push \"dhcp-option DNS 208.67.220.220\"/a\push \"dhcp-option DNS $line\"" server.conf
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done
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;;
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2)
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sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 208.67.222.222"|' server.conf
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sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 208.67.220.220"|' server.conf
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;;
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3)
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sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 4.2.2.2"|' server.conf
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sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 4.2.2.4"|' server.conf
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;;
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4)
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sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 129.250.35.250"|' server.conf
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sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 129.250.35.251"|' server.conf
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;;
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5)
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sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 74.82.42.42"|' server.conf
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;;
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6)
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sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 77.88.8.8"|' server.conf
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sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 77.88.8.1"|' server.conf
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;;
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esac
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# Listen at port 53 too if user wants that
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if [[ "$ALTPORT" = 'y' ]]; then
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iptables -t nat -A PREROUTING -p udp -d $IP --dport 53 -j REDIRECT --to-port $PORT
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sed -i "1 a\iptables -t nat -A PREROUTING -p udp -d $IP --dport 53 -j REDIRECT --to-port $PORT" $RCLOCAL
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fi
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# Enable net.ipv4.ip_forward for the system
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if [[ "$OS" = 'debian' ]]; then
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sed -i 's|#net.ipv4.ip_forward=1|net.ipv4.ip_forward=1|' /etc/sysctl.conf
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else
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# CentOS 5 and 6
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sed -i 's|net.ipv4.ip_forward = 0|net.ipv4.ip_forward = 1|' /etc/sysctl.conf
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# CentOS 7
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if ! grep -q "net.ipv4.ip_forward=1" "/etc/sysctl.conf"; then
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echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf
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fi
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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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# Set iptables
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if [[ "$INTERNALNETWORK" = 'y' ]]; then
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iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
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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
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else
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iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP
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sed -i "1 a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP" $RCLOCAL
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fi
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# And finally, restart OpenVPN
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if [[ "$OS" = 'debian' ]]; then
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# Little hack to check for systemd
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if pgrep systemd-journal; then
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systemctl restart openvpn@server.service
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else
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/etc/init.d/openvpn restart
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fi
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else
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if pgrep systemd-journal; then
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systemctl restart openvpn@server.service
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systemctl enable openvpn@server.service
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else
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service openvpn restart
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chkconfig openvpn on
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fi
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fi
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# Try to detect a NATed connection and ask about it to potential LowEndSpirit
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# users
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EXTERNALIP=$(wget -qO- ipv4.icanhazip.com)
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if [[ "$IP" != "$EXTERNALIP" ]]; then
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echo ""
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echo "Looks like your server is behind a NAT!"
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echo ""
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echo "If your server is NATed (LowEndSpirit), I need to know the external IP"
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echo "If that's not the case, just ignore this and leave the next field blank"
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read -p "External IP: " -e USEREXTERNALIP
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if [[ "$USEREXTERNALIP" != "" ]]; then
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IP=$USEREXTERNALIP
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fi
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fi
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# IP/port set on the default client.conf so we can add further users
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# without asking for them
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sed -i "s|remote my-server-1 1194|remote $IP $PORT|" /usr/share/doc/openvpn*/*ample*/sample-config-files/client.conf
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# Generate the client.ovpn
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newclient "$CLIENT"
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echo ""
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echo "Finished!"
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echo ""
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echo "Your client config is available at ~/$CLIENT.ovpn"
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echo "If you want to add more clients, you simply need to run this script another time!"
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fi
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