Advertisement
Not a member of Pastebin yet?
Sign Up,
it unlocks many cool features!
- #!/bin/bash
- # OpenVPN installer for Debian, Ubuntu and CentOS
- # Author: zeroonehacker
- if [[ "$USER" != 'root' ]]; then
- echo "Sorry, you need to run this as root"
- exit
- fi
- if [[ ! -e /dev/net/tun ]]; then
- echo "TUN/TAP is not available"
- exit
- fi
- if [[ -e /etc/debian_version ]]; then
- OS=debian
- RCLOCAL='/etc/rc.local'
- elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
- OS=centos
- RCLOCAL='/etc/rc.d/rc.local'
- # Needed for CentOS 7
- chmod +x /etc/rc.d/rc.local
- else
- echo "Looks like you aren't running this installer on a Debian, Ubuntu or CentOS system"
- exit
- fi
- newclient () {
- # Generates the client.ovpn
- cp /usr/share/doc/openvpn*/*ample*/sample-config-files/client.conf ~/$1.ovpn
- sed -i "/ca ca.crt/d" ~/$1.ovpn
- sed -i "/cert client.crt/d" ~/$1.ovpn
- sed -i "/key client.key/d" ~/$1.ovpn
- echo "<ca>" >> ~/$1.ovpn
- cat /etc/openvpn/easy-rsa/2.0/keys/ca.crt >> ~/$1.ovpn
- echo "</ca>" >> ~/$1.ovpn
- echo "<cert>" >> ~/$1.ovpn
- cat /etc/openvpn/easy-rsa/2.0/keys/$1.crt >> ~/$1.ovpn
- echo "</cert>" >> ~/$1.ovpn
- echo "<key>" >> ~/$1.ovpn
- cat /etc/openvpn/easy-rsa/2.0/keys/$1.key >> ~/$1.ovpn
- echo "</key>" >> ~/$1.ovpn
- }
- geteasyrsa () {
- wget --no-check-certificate -O ~/easy-rsa.tar.gz https://github.com/OpenVPN/easy-rsa/archive/2.2.2.tar.gz
- tar xzf ~/easy-rsa.tar.gz -C ~/
- mkdir -p /etc/openvpn/easy-rsa/2.0/
- cp ~/easy-rsa-2.2.2/easy-rsa/2.0/* /etc/openvpn/easy-rsa/2.0/
- rm -rf ~/easy-rsa-2.2.2
- rm -rf ~/easy-rsa.tar.gz
- }
- # Try to get our IP from the system and fallback to the Internet.
- IP=$(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 -qO- ipv4.icanhazip.com)
- fi
- if [[ -e /etc/openvpn/server.conf ]]; then
- while :
- do
- clear
- echo "Looks like OpenVPN is already installed"
- echo "What do you want to do?"
- echo ""
- echo "1) Add a cert for a new user"
- echo "2) Revoke existing user cert"
- echo "3) Remove OpenVPN"
- echo "4) Exit"
- echo ""
- read -p "Select an option [1-4]: " option
- case $option in
- 1)
- echo ""
- echo "Tell me a name for the client cert"
- echo "Please, use one word only, no special characters"
- read -p "Client name: " -e -i client CLIENT
- cd /etc/openvpn/easy-rsa/2.0/
- source ./vars
- # build-key for the client
- export KEY_CN="$CLIENT"
- export EASY_RSA="${EASY_RSA:-.}"
- "$EASY_RSA/pkitool" $CLIENT
- # Generate the client.ovpn
- newclient "$CLIENT"
- echo ""
- echo "Client $CLIENT added, certs available at ~/$CLIENT.ovpn"
- exit
- ;;
- 2)
- echo ""
- echo "Tell me the existing client name"
- read -p "Client name: " -e -i client CLIENT
- cd /etc/openvpn/easy-rsa/2.0/
- . /etc/openvpn/easy-rsa/2.0/vars
- . /etc/openvpn/easy-rsa/2.0/revoke-full $CLIENT
- # If it's the first time revoking a cert, we need to add the crl-verify line
- if ! grep -q "crl-verify" "/etc/openvpn/server.conf"; then
- echo "crl-verify /etc/openvpn/easy-rsa/2.0/keys/crl.pem" >> "/etc/openvpn/server.conf"
- # And restart
- if pgrep systemd-journal; then
- systemctl restart openvpn@server.service
- else
- if [[ "$OS" = 'debian' ]]; then
- /etc/init.d/openvpn restart
- else
- service openvpn restart
- fi
- fi
- fi
- 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
- 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*
- sed -i '/--dport 53 -j REDIRECT --to-port/d' $RCLOCAL
- sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0/d' $RCLOCAL
- echo ""
- echo "OpenVPN removed!"
- else
- echo ""
- echo "Removal aborted!"
- fi
- exit
- ;;
- 4) exit;;
- esac
- done
- else
- clear
- echo 'Welcome to this quick OpenVPN 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 $IP IP
- echo ""
- echo "What port do you want for OpenVPN?"
- read -p "Port: " -e -i 1194 PORT
- echo ""
- echo "Do you want OpenVPN to be available at port 53 too?"
- echo "This can be useful to connect under restrictive networks"
- read -p "Listen at port 53 [y/n]: " -e -i n ALTPORT
- echo ""
- echo "Do you want to enable internal networking for the VPN?"
- echo "This can allow VPN clients to communicate between them"
- read -p "Allow internal networking [y/n]: " -e -i n INTERNALNETWORK
- echo ""
- echo "What DNS do you want to use with the VPN?"
- echo " 1) Current system resolvers"
- echo " 2) OpenDNS"
- echo " 3) Level 3"
- echo " 4) NTT"
- echo " 5) Hurricane Electric"
- echo " 6) Yandex"
- read -p "DNS [1-6]: " -e -i 1 DNS
- echo ""
- echo "Finally, tell me your name for the client cert"
- echo "Please, use one word only, no special characters"
- read -p "Client name: " -e -i client CLIENT
- echo ""
- echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now"
- read -n1 -r -p "Press any key to continue..."
- if [[ "$OS" = 'debian' ]]; then
- apt-get update
- apt-get install openvpn iptables openssl -y
- cp -R /usr/share/doc/openvpn/examples/easy-rsa/ /etc/openvpn
- # easy-rsa isn't available by default for Debian Jessie and newer
- if [[ ! -d /etc/openvpn/easy-rsa/2.0/ ]]; then
- geteasyrsa
- fi
- else
- # Else, the distro is CentOS
- yum install epel-release -y
- yum install openvpn iptables openssl wget -y
- geteasyrsa
- fi
- cd /etc/openvpn/easy-rsa/2.0/
- # Let's fix one thing first...
- cp -u -p openssl-1.0.0.cnf openssl.cnf
- # Fuck you NSA - 1024 bits was the default for Debian Wheezy and older
- sed -i 's|export KEY_SIZE=1024|export KEY_SIZE=2048|' /etc/openvpn/easy-rsa/2.0/vars
- # Create the PKI
- . /etc/openvpn/easy-rsa/2.0/vars
- . /etc/openvpn/easy-rsa/2.0/clean-all
- # The following lines are from build-ca. I don't use that script directly
- # because it's interactive and we don't want that. Yes, this could break
- # the installation script if build-ca changes in the future.
- export EASY_RSA="${EASY_RSA:-.}"
- "$EASY_RSA/pkitool" --initca $*
- # Same as the last time, we are going to run build-key-server
- export EASY_RSA="${EASY_RSA:-.}"
- "$EASY_RSA/pkitool" --server server
- # Now the client keys. We need to set KEY_CN or the stupid pkitool will cry
- export KEY_CN="$CLIENT"
- export EASY_RSA="${EASY_RSA:-.}"
- "$EASY_RSA/pkitool" $CLIENT
- # DH params
- . /etc/openvpn/easy-rsa/2.0/build-dh
- # Let's configure the server
- cd /usr/share/doc/openvpn*/*ample*/sample-config-files
- if [[ "$OS" = 'debian' ]]; then
- gunzip -d server.conf.gz
- fi
- cp server.conf /etc/openvpn/
- cd /etc/openvpn/easy-rsa/2.0/keys
- cp ca.crt ca.key dh2048.pem server.crt server.key /etc/openvpn
- cd /etc/openvpn/
- # Set the server configuration
- sed -i 's|dh dh1024.pem|dh dh2048.pem|' server.conf
- sed -i 's|;push "redirect-gateway def1 bypass-dhcp"|push "redirect-gateway def1 bypass-dhcp"|' server.conf
- sed -i "s|port 1194|port $PORT|" 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
- sed -i "/;push \"dhcp-option DNS 208.67.220.220\"/a\push \"dhcp-option DNS $line\"" server.conf
- done
- ;;
- 2)
- sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 208.67.222.222"|' server.conf
- sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 208.67.220.220"|' server.conf
- ;;
- 3)
- sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 4.2.2.2"|' server.conf
- sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 4.2.2.4"|' server.conf
- ;;
- 4)
- sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 129.250.35.250"|' server.conf
- sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 129.250.35.251"|' server.conf
- ;;
- 5)
- sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 74.82.42.42"|' server.conf
- ;;
- 6)
- sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 77.88.8.8"|' server.conf
- sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 77.88.8.1"|' server.conf
- ;;
- esac
- # Listen at port 53 too if user wants that
- if [[ "$ALTPORT" = 'y' ]]; then
- iptables -t nat -A PREROUTING -p udp -d $IP --dport 53 -j REDIRECT --to-port $PORT
- sed -i "1 a\iptables -t nat -A PREROUTING -p udp -d $IP --dport 53 -j REDIRECT --to-port $PORT" $RCLOCAL
- fi
- # Enable net.ipv4.ip_forward for the system
- if [[ "$OS" = 'debian' ]]; then
- sed -i 's|#net.ipv4.ip_forward=1|net.ipv4.ip_forward=1|' /etc/sysctl.conf
- else
- # CentOS 5 and 6
- sed -i 's|net.ipv4.ip_forward = 0|net.ipv4.ip_forward = 1|' /etc/sysctl.conf
- # CentOS 7
- if ! grep -q "net.ipv4.ip_forward=1" "/etc/sysctl.conf"; then
- echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf
- fi
- fi
- # Avoid an unneeded reboot
- echo 1 > /proc/sys/net/ipv4/ip_forward
- # Set iptables
- if [[ "$INTERNALNETWORK" = 'y' ]]; then
- 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
- else
- iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP
- sed -i "1 a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP" $RCLOCAL
- fi
- # And finally, restart OpenVPN
- if [[ "$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=$(wget -qO- ipv4.icanhazip.com)
- if [[ "$IP" != "$EXTERNALIP" ]]; then
- echo ""
- echo "Looks like your server is behind a NAT!"
- echo ""
- echo "If your server is NATed (LowEndSpirit), I need to know the external IP"
- echo "If that's not the case, just ignore this and leave the next field blank"
- read -p "External IP: " -e USEREXTERNALIP
- if [[ "$USEREXTERNALIP" != "" ]]; then
- IP=$USEREXTERNALIP
- fi
- fi
- # IP/port set on the default client.conf so we can add further users
- # without asking for them
- sed -i "s|remote my-server-1 1194|remote $IP $PORT|" /usr/share/doc/openvpn*/*ample*/sample-config-files/client.conf
- # Generate the client.ovpn
- newclient "$CLIENT"
- echo ""
- echo "Finished!"
- echo ""
- echo "Your client config is available at ~/$CLIENT.ovpn"
- echo "If you want to add more clients, you simply need to run this script another time!"
- fi
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement