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- #!/bin/bash
- #
- # https://github.com/Nyr/openvpn-install
- #
- # Copyright (c) 2013 Nyr. Released under the MIT License.
- # Detect Debian users running the script with "sh" instead of bash
- if readlink /proc/$$/exe | grep -q "dash"; then
- echo "This script needs to be run with bash, not sh"
- exit
- fi
- if [[ "$EUID" -ne 0 ]]; then
- echo "Sorry, you need to run this as root"
- exit
- fi
- if [[ ! -e /dev/net/tun ]]; then
- echo "The TUN device is not available
- You need to enable TUN before running this script"
- exit
- 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 Debian, Ubuntu or CentOS"
- exit
- 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
- }
- 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 CLIENT
- cd /etc/openvpn/easy-rsa/
- EASYRSA_CERT_EXPIRE=3650 ./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 simplified
- # ...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
- 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)
- echo
- read -p "Do you really want to revoke access for client $CLIENT? [y/N]: " -e REVOKE
- if [[ "$REVOKE" = 'y' || "$REVOKE" = 'Y' ]]; then
- cd /etc/openvpn/easy-rsa/
- ./easyrsa --batch revoke $CLIENT
- EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
- rm -f pki/reqs/$CLIENT.req
- rm -f pki/private/$CLIENT.key
- rm -f pki/issued/$CLIENT.crt
- rm -f /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!"
- else
- echo
- echo "Certificate revocation for client $CLIENT aborted!"
- fi
- exit
- ;;
- 3)
- echo
- read -p "Do you really want to remove OpenVPN? [y/N]: " -e REMOVE
- if [[ "$REMOVE" = 'y' || "$REMOVE" = 'Y' ]]; then
- PORT=$(grep '^port ' /etc/openvpn/server.conf | cut -d " " -f 2)
- PROTOCOL=$(grep '^proto ' /etc/openvpn/server.conf | cut -d " " -f 2)
- if pgrep firewalld; then
- IP=$(firewall-cmd --direct --get-rules ipv4 nat POSTROUTING | grep '\-s 10.8.0.0/24 '"'"'!'"'"' -d 10.8.0.0/24 -j SNAT --to ' | cut -d " " -f 10)
- # 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
- firewall-cmd --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
- firewall-cmd --permanent --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
- else
- IP=$(grep 'iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to ' $RCLOCAL | cut -d " " -f 14)
- iptables -t nat -D POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
- sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 ! -d 10.8.0.0\/24 -j SNAT --to /d' $RCLOCAL
- if iptables -L -n | grep -qE '^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" $RCLOCAL
- fi
- fi
- if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$PORT" != '1194' ]]; then
- semanage port -d -t openvpn_port_t -p $PROTOCOL $PORT
- fi
- if [[ "$OS" = 'debian' ]]; then
- apt-get remove --purge -y openvpn
- else
- yum remove openvpn -y
- fi
- rm -rf /etc/openvpn
- rm -f /etc/sysctl.d/30-openvpn-forward.conf
- echo
- echo "OpenVPN removed!"
- else
- echo
- echo "Removal aborted!"
- fi
- exit
- ;;
- 4) exit;;
- esac
- done
- else
- clear
- echo 'Welcome to this 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, provide the IPv4 address of the network interface you want OpenVPN"
- echo "listening to."
- # Autodetect IP address and pre-fill for the user
- IP=$(ip addr | grep 'inet' | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1)
- read -p "IP address: " -e -i $IP IP
- # If $IP is a private IP address, the server must be behind NAT
- if echo "$IP" | grep -qE '^(10\.|172\.1[6789]\.|172\.2[0-9]\.|172\.3[01]\.|192\.168)'; then
- echo
- echo "This server is behind NAT. What is the public IPv4 address or hostname?"
- read -p "Public IP address / hostname: " -e PUBLICIP
- fi
- 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 $PROTOCOL in
- 1)
- PROTOCOL=udp
- ;;
- 2)
- PROTOCOL=tcp
- ;;
- esac
- echo
- echo "What port do you want OpenVPN listening to?"
- read -p "Port: " -e -i 1194 PORT
- echo
- echo "Which DNS do you want to use with the VPN?"
- echo " 1) Current system resolvers"
- echo " 2) 1.1.1.1"
- echo " 3) Google"
- echo " 4) OpenDNS"
- echo " 5) Verisign"
- read -p "DNS [1-5]: " -e -i 1 DNS
- echo
- echo "Finally, tell me your name for the client certificate."
- echo "Please, use one word only, no special characters."
- read -p "Client name: " -e -i client CLIENT
- echo
- echo "Okay, that was all I needed. We are ready to set up your OpenVPN server now."
- read -n1 -r -p "Press any key to continue..."
- if [[ "$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 ca-certificates -y
- fi
- # Get easy-rsa
- EASYRSAURL='https://github.com/OpenVPN/easy-rsa/releases/download/v3.0.5/EasyRSA-nix-3.0.5.tgz'
- wget -O ~/easyrsa.tgz "$EASYRSAURL" 2>/dev/null || curl -Lo ~/easyrsa.tgz "$EASYRSAURL"
- tar xzf ~/easyrsa.tgz -C ~/
- mv ~/EasyRSA-3.0.5/ /etc/openvpn/
- mv /etc/openvpn/EasyRSA-3.0.5/ /etc/openvpn/easy-rsa/
- chown -R root:root /etc/openvpn/easy-rsa/
- rm -f ~/easyrsa.tgz
- cd /etc/openvpn/easy-rsa/
- # Create the PKI, set up the CA and the server and client certificates
- ./easyrsa init-pki
- ./easyrsa --batch build-ca nopass
- EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-server-full server nopass
- EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-client-full $CLIENT nopass
- EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
- # Move the stuff we need
- cp pki/ca.crt pki/private/ca.key pki/issued/server.crt pki/private/server.key pki/crl.pem /etc/openvpn
- # CRL is read with each client connection, when OpenVPN is dropped to nobody
- chown nobody:$GROUPNAME /etc/openvpn/crl.pem
- # Generate key for tls-auth
- openvpn --genkey --secret /etc/openvpn/ta.key
- # Create the DH parameters file using the predefined ffdhe2048 group
- echo '-----BEGIN DH PARAMETERS-----
- MIIBCAKCAQEA//////////+t+FRYortKmq/cViAnPTzx2LnFg84tNpWp4TZBFGQz
- +8yTnc4kmz75fS/jY2MMddj2gbICrsRhetPfHtXV/WVhJDP1H18GbtCFY2VVPe0a
- 87VXE15/V8k1mE8McODmi3fipona8+/och3xWKE2rec1MKzKT0g6eXq8CrGCsyT7
- YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi
- 7MA0BM0oNC9hkXL+nOmFg/+OTxIy7vKBg8P+OxtMb61zO7X8vC7CIAXFjvGDfRaD
- ssbzSibBsu/6iGtCOGEoXJf//////////wIBAg==
- -----END DH PARAMETERS-----' > /etc/openvpn/dh.pem
- # 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
- auth SHA512
- 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)
- # Locate the proper resolv.conf
- # Needed for systems running systemd-resolved
- if grep -q "127.0.0.53" "/etc/resolv.conf"; then
- RESOLVCONF='/run/systemd/resolve/resolv.conf'
- else
- RESOLVCONF='/etc/resolv.conf'
- fi
- # Obtain the resolvers from resolv.conf and use them for OpenVPN
- grep -v '#' $RESOLVCONF | 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 1.1.1.1"' >> /etc/openvpn/server.conf
- echo 'push "dhcp-option DNS 1.0.0.1"' >> /etc/openvpn/server.conf
- ;;
- 3)
- 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
- ;;
- 4)
- 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
- ;;
- 5)
- 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
- user nobody
- group $GROUPNAME
- persist-key
- persist-tun
- status openvpn-status.log
- verb 3
- crl-verify crl.pem" >> /etc/openvpn/server.conf
- # Enable net.ipv4.ip_forward for the system
- echo 'net.ipv4.ip_forward=1' > /etc/sysctl.d/30-openvpn-forward.conf
- # Enable without waiting for a reboot or service restart
- echo 1 > /proc/sys/net/ipv4/ip_forward
- if pgrep firewalld; then
- # Using both permanent and not permanent rules to avoid a firewalld
- # reload.
- # We don't use --add-service=openvpn because that would only work with
- # the default port and protocol.
- firewall-cmd --zone=public --add-port=$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
- # Set NAT for the VPN subnet
- firewall-cmd --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
- firewall-cmd --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
- else
- # Needed to use rc.local with some systemd distros
- if [[ "$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 ! -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
- 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" $RCLOCAL
- fi
- fi
- # If SELinux is enabled and a custom port was selected, we need this
- if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$PORT" != '1194' ]]; then
- # Install semanage if not already present
- if ! hash semanage 2>/dev/null; then
- yum install policycoreutils-python -y
- fi
- semanage port -a -t openvpn_port_t -p $PROTOCOL $PORT
- fi
- # And finally, restart OpenVPN
- if [[ "$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
- # If the server is behind a NAT, use the correct IP address
- if [[ "$PUBLICIP" != "" ]]; then
- IP=$PUBLICIP
- 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 $PORT
- resolv-retry infinite
- nobind
- persist-key
- persist-tun
- remote-cert-tls server
- auth SHA512
- cipher AES-256-CBC
- setenv opt block-outside-dns
- key-direction 1
- verb 3" > /etc/openvpn/client-common.txt
- # Generates the custom client.ovpn
- newclient "$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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