229 lines
8.6 KiB
Bash
Executable File
229 lines
8.6 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 1194/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|;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 74.82.42.42"|' server.conf
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sed -i "s|port 1194|port $PORT|" server.conf
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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 1194
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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 1194" /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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