From 59c204646356af475aca331ea19efb8b30192bc5 Mon Sep 17 00:00:00 2001 From: maximstewart Date: Sat, 6 Mar 2021 18:32:24 -0600 Subject: [PATCH] added openvpn install script --- src/Shell/easy-openvpn-install.sh | 401 ++++++++++++++++++++++++++++++ 1 file changed, 401 insertions(+) create mode 100755 src/Shell/easy-openvpn-install.sh diff --git a/src/Shell/easy-openvpn-install.sh b/src/Shell/easy-openvpn-install.sh new file mode 100755 index 0000000..fb00722 --- /dev/null +++ b/src/Shell/easy-openvpn-install.sh @@ -0,0 +1,401 @@ +#!/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 "" >> ~/$1.ovpn + cat /etc/openvpn/easy-rsa/pki/ca.crt >> ~/$1.ovpn + echo "" >> ~/$1.ovpn + echo "" >> ~/$1.ovpn + cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> ~/$1.ovpn + echo "" >> ~/$1.ovpn + echo "" >> ~/$1.ovpn + cat /etc/openvpn/easy-rsa/pki/private/$1.key >> ~/$1.ovpn + echo "" >> ~/$1.ovpn + echo "" >> ~/$1.ovpn + cat /etc/openvpn/ta.key >> ~/$1.ovpn + echo "" >> ~/$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 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 + 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/v3.0.4/EasyRSA-3.0.4.tgz' + wget -O ~/easyrsa.tgz "$EASYRSAURL" 2>/dev/null || curl -Lo ~/easyrsa.tgz "$EASYRSAURL" + tar xzf ~/easyrsa.tgz -C ~/ + mv ~/EasyRSA-3.0.4/ /etc/openvpn/ + mv /etc/openvpn/EasyRSA-3.0.4/ /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, 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 $CLIENT nopass + EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl + # Move the stuff we need + cp pki/ca.crt pki/private/ca.key pki/dh.pem pki/issued/server.crt pki/private/server.key pki/crl.pem /etc/openvpn + # CRL is read with each client connection, when OpenVPN is dropped to nobody + chown nobody:$GROUPNAME /etc/openvpn/crl.pem + # Generate key for tls-auth + openvpn --genkey --secret /etc/openvpn/ta.key + # 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 +comp-lzo +user nobody +group $GROUPNAME +persist-key +persist-tun +status openvpn-status.log +verb 3 +crl-verify crl.pem" >> /etc/openvpn/server.conf + # Enable net.ipv4.ip_forward for the system + sed -i '/\/c\net.ipv4.ip_forward=1' /etc/sysctl.conf + if ! grep -q "\" /etc/sysctl.conf; then + echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf + fi + # Avoid an unneeded reboot + echo 1 > /proc/sys/net/ipv4/ip_forward + if pgrep firewalld; then + # Using both permanent and not permanent rules to avoid a firewalld + # reload. + # We don't use --add-service=openvpn because that would only work with + # the default port and protocol. + firewall-cmd --zone=public --add-port=$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 $PORT +resolv-retry infinite +nobind +persist-key +persist-tun +remote-cert-tls server +auth SHA512 +cipher AES-256-CBC +comp-lzo +setenv opt block-outside-dns +key-direction 1 +verb 3" > /etc/openvpn/client-common.txt + # Generates the custom client.ovpn + newclient "$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