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- #!/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 "TUN is not available"
- 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 a Debian, Ubuntu or CentOS system"
- exit 5
- fi
- newclient () {
- # Generates the custom client.ovpn
- cp /etc/openvpn/client-common.txt ~/$1.ovpn
- echo "<ca>" >> ~/$1.ovpn
- cat /etc/openvpn/easy-rsa/pki/ca.crt >> ~/$1.ovpn
- echo "</ca>" >> ~/$1.ovpn
- echo "<cert>" >> ~/$1.ovpn
- cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> ~/$1.ovpn
- echo "</cert>" >> ~/$1.ovpn
- echo "<key>" >> ~/$1.ovpn
- cat /etc/openvpn/easy-rsa/pki/private/$1.key >> ~/$1.ovpn
- echo "</key>" >> ~/$1.ovpn
- echo "<tls-auth>" >> ~/$1.ovpn
- cat /etc/openvpn/ta.key >> ~/$1.ovpn
- echo "</tls-auth>" >> ~/$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)
- IP=$(grep 'iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to ' $RCLOCAL | cut -
- d " " -f 11)
- if pgrep firewalld; then
- # 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
- fi
- if iptables -L -n | grep -qE 'REJECT|DROP|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
- iptables -t nat -D POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP
- sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 -j SNAT --to /d' $RCLOCAL
- 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/p
- ki/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
- 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 '/\<net.ipv4.ip_forward\>/c\net.ipv4.ip_forward=1' /etc/sysctl.conf
- if ! grep -q "\<net.ipv4.ip_forward\>" /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
- # 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 -j SNAT --to $IP
- sed -i "1 a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP" $RCLOCAL
- if pgrep firewalld; then
- # We don't use --add-service=openvpn because that would only work with
- # the default port and protocol. Using both permanent and not permanent
- # rules to avoid a firewalld reload.
- 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
- fi
- 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
- # 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
- root@tunneltest:~# cat openvpn-install.sh
- #!/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 "TUN is not available"
- 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 a Debian, Ubuntu or CentOS system"
- exit 5
- fi
- newclient () {
- # Generates the custom client.ovpn
- cp /etc/openvpn/client-common.txt ~/$1.ovpn
- echo "<ca>" >> ~/$1.ovpn
- cat /etc/openvpn/easy-rsa/pki/ca.crt >> ~/$1.ovpn
- echo "</ca>" >> ~/$1.ovpn
- echo "<cert>" >> ~/$1.ovpn
- cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> ~/$1.ovpn
- echo "</cert>" >> ~/$1.ovpn
- echo "<key>" >> ~/$1.ovpn
- cat /etc/openvpn/easy-rsa/pki/private/$1.key >> ~/$1.ovpn
- echo "</key>" >> ~/$1.ovpn
- echo "<tls-auth>" >> ~/$1.ovpn
- cat /etc/openvpn/ta.key >> ~/$1.ovpn
- echo "</tls-auth>" >> ~/$1.ovpn
- }
- # Try to get our IP from the system and fallback to the Internet.
- # I do this to make the script compatible with NATed servers (lowendspirit.com)
- # and to avoid getting an IPv6.
- IP=$(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)
- IP=$(grep 'iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to ' $RCLOCAL | cut -
- d " " -f 11)
- if pgrep firewalld; then
- # Using both permanent and not permanent rules to avoid a firewalld reload.
- firewall-cmd --zone=public --remove-port=$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
- fi
- if iptables -L -n | grep -qE 'REJECT|DROP|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
- iptables -t nat -D POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP
- sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 -j SNAT --to /d' $RCLOCAL
- if hash sestatus 2>/dev/null; then
- if sestatus | grep "Current mode" | grep -qs "enforcing"; then
- if [[ "$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 $CLIENT nopass
- ./easyrsa gen-crl
- # Move the stuff we need
- cp pki/ca.crt pki/private/ca.key pki/dh.pem pki/issued/server.crt pki/private/server.key /etc/openvpn/easy-rsa/p
- ki/crl.pem /etc/openvpn
- # CRL is read with each client connection, when OpenVPN is dropped to nobody
- chown nobody:$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
- 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 $GROUPNAME
- persist-key
- persist-tun
- status openvpn-status.log
- verb 3
- crl-verify crl.pem" >> /etc/openvpn/server.conf
- # Enable net.ipv4.ip_forward for the system
- sed -i '/\<net.ipv4.ip_forward\>/c\net.ipv4.ip_forward=1' /etc/sysctl.conf
- if ! grep -q "\<net.ipv4.ip_forward\>" /etc/sysctl.conf; then
- echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf
- fi
- # Avoid an unneeded reboot
- echo 1 > /proc/sys/net/ipv4/ip_forward
- # Needed to use rc.local with some systemd distros
- if [[ "$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 -j SNAT --to $IP
- sed -i "1 a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP" $RCLOCAL
- if pgrep firewalld; then
- # We don't use --add-service=openvpn because that would only work with
- # the default port and protocol. Using both permanent and not permanent
- # rules to avoid a firewalld reload.
- firewall-cmd --zone=public --add-port=$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
- fi
- 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" $RCLOCAL
- fi
- # If SELinux is enabled and a custom port or TCP was selected, we need this
- if hash sestatus 2>/dev/null; then
- if sestatus | grep "Current mode" | grep -qs "enforcing"; then
- if [[ "$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 $PORT
- resolv-retry infinite
- nobind
- persist-key
- persist-tun
- remote-cert-tls server
- cipher AES-256-CBC
- comp-lzo
- setenv opt block-outside-dns
- key-direction 1
- verb 3" > /etc/openvpn/client-common.txt
- # Generates the custom client.ovpn
- newclient "$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
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