mirror of
https://github.com/Nyr/openvpn-install.git
synced 2024-11-23 21:46:08 +03:00
afb30c44da
This will help with some ISPs restricting access to third party DNS servers like it happens with LowEndSpirit and Torqhost.
231 lines
8.7 KiB
Bash
Executable File
231 lines
8.7 KiB
Bash
Executable File
#!/bin/bash
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# OpenVPN road warrior installer for Debian-based distros
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# This script will only work on Debian-based systems. It isn't bulletproof but
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# it will probably work if you simply want to setup a VPN on your Debian/Ubuntu
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# VPS. It has been designed to be as unobtrusive and universal as possible.
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if [ $USER != 'root' ]; then
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echo "Sorry, you need to run this as root"
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exit
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fi
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if [ ! -e /dev/net/tun ]; then
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echo "TUN/TAP is not available"
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exit
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fi
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if [ ! -e /etc/debian_version ]; then
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echo "Looks like you aren't running this installer on a Debian-based system"
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exit
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fi
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# Try to get our IP from the system and fallback to the Internet.
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# I do this to make the script compatible with NATed servers (lowendspirit.com)
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# and to avoid getting an IPv6.
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IP=$(ifconfig | grep 'inet addr:' | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | cut -d: -f2 | awk '{ print $1}' | head -1)
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if [ "$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 "What do you want to do?"
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echo ""
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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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echo ""
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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" $CLIENT
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# Let's generate the client config
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mkdir ~/ovpn-$CLIENT
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cp /usr/share/doc/openvpn/examples/sample-config-files/client.conf ~/ovpn-$CLIENT/$CLIENT.conf
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cp /etc/openvpn/easy-rsa/2.0/keys/ca.crt ~/ovpn-$CLIENT
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cp /etc/openvpn/easy-rsa/2.0/keys/$CLIENT.crt ~/ovpn-$CLIENT
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cp /etc/openvpn/easy-rsa/2.0/keys/$CLIENT.key ~/ovpn-$CLIENT
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cd ~/ovpn-$CLIENT
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sed -i "s|cert client.crt|cert $CLIENT.crt|" $CLIENT.conf
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sed -i "s|key client.key|key $CLIENT.key|" $CLIENT.conf
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tar -czf ../ovpn-$CLIENT.tar.gz $CLIENT.conf ca.crt $CLIENT.crt $CLIENT.key
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cd ~/
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rm -rf ovpn-$CLIENT
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echo ""
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echo "Client $CLIENT added, certs available at ~/ovpn-$CLIENT.tar.gz"
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exit
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;;
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2)
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echo ""
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echo "Tell me the existing client name"
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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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. /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 ""
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echo "Certificate for client $CLIENT revoked"
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else
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echo "crl-verify /etc/openvpn/easy-rsa/2.0/keys/crl.pem" >> "/etc/openvpn/server.conf"
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/etc/init.d/openvpn restart
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echo ""
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echo "Certificate for client $CLIENT revoked"
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fi
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exit
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;;
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3)
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apt-get remove --purge -y openvpn openvpn-blacklist
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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' /etc/rc.local
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sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0/d' /etc/rc.local
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echo ""
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echo "OpenVPN removed!"
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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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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 "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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apt-get update
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apt-get install openvpn iptables openssl -y
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cp -R /usr/share/doc/openvpn/examples/easy-rsa/ /etc/openvpn
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# easy-rsa isn't available by default for Debian Jessie and newer
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if [ ! -d /etc/openvpn/easy-rsa/2.0/ ]; then
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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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fi
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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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# Fuck you NSA - 1024 bits was the default for Debian Wheezy and older
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sed -i 's|export KEY_SIZE=1024|export KEY_SIZE=2048|' /etc/openvpn/easy-rsa/2.0/vars
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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/examples/sample-config-files
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gunzip -d server.conf.gz
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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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# Obtain the resolvers from resolv.conf and use them for OpenVPN
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cat /etc/resolv.conf | grep -v '#' | 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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# 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 "/# By default this script does nothing./a\iptables -t nat -A PREROUTING -p udp -d $IP --dport 53 -j REDIRECT --to-port $PORT" /etc/rc.local
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fi
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# Enable net.ipv4.ip_forward for the system
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sed -i 's|#net.ipv4.ip_forward=1|net.ipv4.ip_forward=1|' /etc/sysctl.conf
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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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iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP
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sed -i "/# By default this script does nothing./a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP" /etc/rc.local
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# And finally, restart OpenVPN
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/etc/init.d/openvpn restart
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# Let's generate the client config
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mkdir ~/ovpn-$CLIENT
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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 $PORT|" /usr/share/doc/openvpn/examples/sample-config-files/client.conf
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cp /usr/share/doc/openvpn/examples/sample-config-files/client.conf ~/ovpn-$CLIENT/$CLIENT.conf
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cp /etc/openvpn/easy-rsa/2.0/keys/ca.crt ~/ovpn-$CLIENT
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cp /etc/openvpn/easy-rsa/2.0/keys/$CLIENT.crt ~/ovpn-$CLIENT
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cp /etc/openvpn/easy-rsa/2.0/keys/$CLIENT.key ~/ovpn-$CLIENT
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cd ~/ovpn-$CLIENT
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sed -i "s|cert client.crt|cert $CLIENT.crt|" $CLIENT.conf
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sed -i "s|key client.key|key $CLIENT.key|" $CLIENT.conf
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tar -czf ../ovpn-$CLIENT.tar.gz $CLIENT.conf ca.crt $CLIENT.crt $CLIENT.key
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cd ~/
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rm -rf ovpn-$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 ~/ovpn-$CLIENT.tar.gz"
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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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