openvpn
This commit is contained in:
simono41
parent
2446f6e84d
commit
31d3a872cf
1 changed files with 438 additions and 211 deletions
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@ -1,88 +1,114 @@
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#!/bin/bash
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# OpenVPN road warrior installer for Debian, Ubuntu and CentOS
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# This script will work on Debian, Ubuntu, CentOS and probably other distros
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# of the same families, although no support is offered for them. It isn't
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# bulletproof but it will probably work if you simply want to setup a VPN on
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# your Debian/Ubuntu/CentOS box. It has been designed to be as unobtrusive and
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# universal as possible.
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# Secure OpenVPN server installer for Debian, Ubuntu, CentOS and Arch Linux
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# https://github.com/Angristan/OpenVPN-install
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# Detect Debian users running the script with "sh" instead of bash
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if readlink /proc/$$/exe | grep -qs "dash"; then
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echo "This script needs to be run with bash, not sh"
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exit 1
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fi
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if [[ "$EUID" -ne 0 ]]; then
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echo "Sorry, you need to run this as root"
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exit 2
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exit 1
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fi
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if [[ ! -e /dev/net/tun ]]; then
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echo "The TUN device is not available
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You need to enable TUN before running this script"
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exit 3
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echo "TUN is not available"
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exit 2
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fi
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if grep -qs "CentOS release 5" "/etc/redhat-release"; then
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echo "CentOS 5 is too old and not supported"
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exit 3
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fi
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if [[ -e /etc/debian_version ]]; then
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OS="debian"
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# Getting the version number, to verify that a recent version of OpenVPN is available
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VERSION_ID=$(cat /etc/os-release | grep "VERSION_ID")
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RCLOCAL='/etc/rc.local'
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SYSCTL='/etc/sysctl.conf'
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if [[ "$VERSION_ID" != 'VERSION_ID="7"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="8"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="9"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="12.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="14.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="16.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="16.10"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="17.04"' ]]; then
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echo "Your version of Debian/Ubuntu is not supported."
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echo "I can't install a recent version of OpenVPN on your system."
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echo ""
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echo "However, if you're using Debian unstable/testing, or Ubuntu beta,"
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echo "then you can continue, a recent version of OpenVPN is available on these."
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echo "Keep in mind they are not supported, though."
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while [[ $CONTINUE != "y" && $CONTINUE != "n" ]]; do
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read -p "Continue ? [y/n]: " -e CONTINUE
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done
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if [[ "$CONTINUE" = "n" ]]; then
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echo "Ok, bye !"
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exit 4
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fi
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if [[ -e /etc/debian_version ]]; then
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OS=debian
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GROUPNAME=nogroup
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RCLOCAL='/etc/rc.local'
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fi
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elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
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OS=centos
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GROUPNAME=nobody
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RCLOCAL='/etc/rc.d/rc.local'
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SYSCTL='/etc/sysctl.conf'
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# Needed for CentOS 7
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chmod +x /etc/rc.d/rc.local
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elif [[ -e /etc/arch-release ]]; then
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OS=arch
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RCLOCAL='/etc/rc.local'
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SYSCTL='/etc/sysctl.d/openvpn.conf'
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else
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echo "Looks like you aren't running this installer on Debian, Ubuntu or CentOS"
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exit 5
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echo "Looks like you aren't running this installer on a Debian, Ubuntu, CentOS or ArchLinux system"
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exit 4
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fi
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newclient () {
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# Where to write the custom client.ovpn?
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if [ -e /home/$1 ]; then # if $1 is a user name
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homeDir="/home/$1"
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elif [ ${SUDO_USER} ]; then # if not, use SUDO_USER
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homeDir="/home/${SUDO_USER}"
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else # if not SUDO_USER, use /root
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homeDir="/root"
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fi
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# Generates the custom client.ovpn
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cp /etc/openvpn/client-common.txt ~/$1.ovpn
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echo "<ca>" >> ~/$1.ovpn
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cat /etc/openvpn/easy-rsa/pki/ca.crt >> ~/$1.ovpn
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echo "</ca>" >> ~/$1.ovpn
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echo "<cert>" >> ~/$1.ovpn
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cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> ~/$1.ovpn
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echo "</cert>" >> ~/$1.ovpn
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echo "<key>" >> ~/$1.ovpn
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cat /etc/openvpn/easy-rsa/pki/private/$1.key >> ~/$1.ovpn
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echo "</key>" >> ~/$1.ovpn
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echo "<tls-auth>" >> ~/$1.ovpn
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cat /etc/openvpn/ta.key >> ~/$1.ovpn
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echo "</tls-auth>" >> ~/$1.ovpn
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cp /etc/openvpn/client-template.txt $homeDir/$1.ovpn
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echo "<ca>" >> $homeDir/$1.ovpn
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cat /etc/openvpn/easy-rsa/pki/ca.crt >> $homeDir/$1.ovpn
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echo "</ca>" >> $homeDir/$1.ovpn
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echo "<cert>" >> $homeDir/$1.ovpn
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cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> $homeDir/$1.ovpn
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echo "</cert>" >> $homeDir/$1.ovpn
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echo "<key>" >> $homeDir/$1.ovpn
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cat /etc/openvpn/easy-rsa/pki/private/$1.key >> $homeDir/$1.ovpn
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echo "</key>" >> $homeDir/$1.ovpn
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echo "key-direction 1" >> $homeDir/$1.ovpn
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echo "<tls-auth>" >> $homeDir/$1.ovpn
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cat /etc/openvpn/tls-auth.key >> $homeDir/$1.ovpn
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echo "</tls-auth>" >> $homeDir/$1.ovpn
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}
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# Try to get our IP from the system and fallback to the Internet.
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# I do this to make the script compatible with NATed servers (lowendspirit.com)
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# I do this to make the script compatible with NATed servers (LowEndSpirit/Scaleway)
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# and to avoid getting an IPv6.
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IP=$(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)
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if [[ "$IP" = "" ]]; then
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IP=$(wget -4qO- "http://whatismyip.akamai.com/")
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IP=$(wget -qO- ipv4.icanhazip.com)
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fi
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# Get Internet network interface with default route
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NIC=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)')
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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 "OpenVPN-install (github.com/Angristan/OpenVPN-install)"
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echo ""
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echo "Looks like OpenVPN is already installed"
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echo ""
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echo "What do you want to do?"
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echo " 1) Add a new user"
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echo " 2) Revoke an existing user"
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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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read -p "Select an option [1-4]: " option
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case $option in
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1)
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echo ""
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echo "Tell me a name for the client certificate"
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echo "Tell me a name for the client cert"
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echo "Please, use one word only, no special characters"
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read -p "Client name: " -e -i client CLIENT
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cd /etc/openvpn/easy-rsa/
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@ -90,17 +116,15 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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# Generates the custom client.ovpn
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newclient "$CLIENT"
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echo ""
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echo "Client $CLIENT added, configuration is available at" ~/"$CLIENT.ovpn"
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echo "Client $CLIENT added, certs available at $homeDir/$CLIENT.ovpn"
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exit
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;;
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2)
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# This option could be documented a bit better and maybe even be simplimplified
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# ...but what can I say, I want some sleep too
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NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep -c "^V")
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if [[ "$NUMBEROFCLIENTS" = '0' ]]; then
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echo ""
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echo "You have no existing clients!"
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exit 6
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exit 5
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fi
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echo ""
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echo "Select the existing client certificate you want to revoke"
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@ -119,10 +143,10 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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rm -rf pki/issued/$CLIENT.crt
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rm -rf /etc/openvpn/crl.pem
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cp /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn/crl.pem
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# CRL is read with each client connection, when OpenVPN is dropped to nobody
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chown nobody:$GROUPNAME /etc/openvpn/crl.pem
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chmod 644 /etc/openvpn/crl.pem
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echo ""
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echo "Certificate for client $CLIENT revoked"
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echo "Exiting..."
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exit
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;;
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3)
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@ -130,42 +154,35 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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read -p "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
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if [[ "$REMOVE" = 'y' ]]; then
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PORT=$(grep '^port ' /etc/openvpn/server.conf | cut -d " " -f 2)
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PROTOCOL=$(grep '^proto ' /etc/openvpn/server.conf | cut -d " " -f 2)
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if pgrep firewalld; then
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IP=$(firewall-cmd --direct --get-rules ipv4 nat POSTROUTING | grep '\-s 10.8.0.0/24 '"'"'!'"'"' -d 10.8.0.0/24 -j SNAT --to ' | cut -d " " -f 10)
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# Using both permanent and not permanent rules to avoid a firewalld reload.
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firewall-cmd --zone=public --remove-port=$PORT/$PROTOCOL
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firewall-cmd --zone=public --remove-port=$PORT/udp
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firewall-cmd --zone=trusted --remove-source=10.8.0.0/24
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firewall-cmd --permanent --zone=public --remove-port=$PORT/$PROTOCOL
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firewall-cmd --permanent --zone=public --remove-port=$PORT/udp
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firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
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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
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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 $IP
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else
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IP=$(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)
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iptables -t nat -D POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
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sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 ! -d 10.8.0.0\/24 -j SNAT --to /d' $RCLOCAL
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if iptables -L -n | grep -qE '^ACCEPT'; then
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iptables -D INPUT -p $PROTOCOL --dport $PORT -j ACCEPT
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iptables -D FORWARD -s 10.8.0.0/24 -j ACCEPT
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iptables -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
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sed -i "/iptables -I INPUT -p $PROTOCOL --dport $PORT -j ACCEPT/d" $RCLOCAL
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fi
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if iptables -L -n | grep -qE 'REJECT|DROP'; then
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sed -i "/iptables -I INPUT -p udp --dport $PORT -j ACCEPT/d" $RCLOCAL
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sed -i "/iptables -I FORWARD -s 10.8.0.0\/24 -j ACCEPT/d" $RCLOCAL
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sed -i "/iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT/d" $RCLOCAL
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fi
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fi
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sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 -j SNAT --to /d' $RCLOCAL
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if hash sestatus 2>/dev/null; then
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if sestatus | grep "Current mode" | grep -qs "enforcing"; then
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if [[ "$PORT" != '1194' || "$PROTOCOL" = 'tcp' ]]; then
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semanage port -d -t openvpn_port_t -p $PROTOCOL $PORT
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if [[ "$PORT" != '1194' ]]; then
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semanage port -d -t openvpn_port_t -p udp $PORT
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fi
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fi
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fi
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if [[ "$OS" = 'debian' ]]; then
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apt-get remove --purge -y openvpn
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apt-get autoremove --purge -y openvpn
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elif [[ "$OS" = 'arch' ]]; then
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pacman -R openvpn --noconfirm
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else
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yum remove openvpn -y
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fi
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rm -rf /etc/openvpn
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rm -rf /usr/share/doc/openvpn*
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echo ""
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echo "OpenVPN removed!"
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else
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@ -179,97 +196,254 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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done
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else
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clear
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echo 'Welcome to this quick OpenVPN "road warrior" installer'
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echo "Welcome to the secure OpenVPN installer (github.com/Angristan/OpenVPN-install)"
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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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echo "I need to know the IPv4 address of the network interface you want OpenVPN listening to."
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echo "If your server is running behind a NAT, (e.g. LowEndSpirit, Scaleway) leave the IP address as it is. (local/private IP)"
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echo "Otherwise, it should be your public IPv4 address."
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read -p "IP address: " -e -i $IP IP
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echo ""
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echo "Which protocol do you want for OpenVPN connections?"
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echo " 1) UDP (recommended)"
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echo " 2) TCP"
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read -p "Protocol [1-2]: " -e -i 1 PROTOCOL
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case $PROTOCOL in
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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 "What protocol do you want for OpenVPN?"
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echo "Unless UDP is blocked, you should not use TCP (unnecessarily slower)"
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while [[ $PROTOCOL != "UDP" && $PROTOCOL != "TCP" ]]; do
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read -p "Protocol [UDP/TCP]: " -e -i UDP PROTOCOL
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done
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echo ""
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echo "What DNS do you want to use with the VPN?"
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echo " 1) Current system resolvers (in /etc/resolv.conf)"
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echo " 2) FDN (France)"
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echo " 3) DNS.WATCH (Germany)"
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echo " 4) OpenDNS (Anycast: worldwide)"
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echo " 5) Google (Anycast: worldwide)"
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echo " 6) Yandex Basic (Russia)"
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while [[ $DNS != "1" && $DNS != "2" && $DNS != "3" && $DNS != "4" && $DNS != "5" && $DNS != "6" ]]; do
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read -p "DNS [1-6]: " -e -i 1 DNS
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done
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echo ""
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echo "See https://github.com/Angristan/OpenVPN-install#encryption to learn more about "
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echo "the encryption in OpenVPN and the choices I made in this script."
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echo "Please note that all the choices proposed are secure (to a different degree)"
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echo "and are still viable to date, unlike some default OpenVPN options"
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echo ''
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echo "Choose which cipher you want to use for the data channel:"
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echo " 1) AES-128-CBC (fastest and sufficiently secure for everyone, recommended)"
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echo " 2) AES-192-CBC"
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echo " 3) AES-256-CBC"
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echo "Alternatives to AES, use them only if you know what you're doing."
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echo "They are relatively slower but as secure as AES."
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echo " 4) CAMELLIA-128-CBC"
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echo " 5) CAMELLIA-192-CBC"
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echo " 6) CAMELLIA-256-CBC"
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echo " 7) SEED-CBC"
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while [[ $CIPHER != "1" && $CIPHER != "2" && $CIPHER != "3" && $CIPHER != "4" && $CIPHER != "5" && $CIPHER != "6" && $CIPHER != "7" ]]; do
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read -p "Cipher [1-7]: " -e -i 1 CIPHER
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done
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case $CIPHER in
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1)
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PROTOCOL=udp
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CIPHER="cipher AES-128-CBC"
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;;
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2)
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PROTOCOL=tcp
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CIPHER="cipher AES-192-CBC"
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;;
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3)
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CIPHER="cipher AES-256-CBC"
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;;
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4)
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CIPHER="cipher CAMELLIA-128-CBC"
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;;
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5)
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CIPHER="cipher CAMELLIA-192-CBC"
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;;
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6)
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CIPHER="cipher CAMELLIA-256-CBC"
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;;
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7)
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CIPHER="cipher SEED-CBC"
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;;
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esac
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echo ""
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echo "What port do you want OpenVPN listening to?"
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read -p "Port: " -e -i 1194 PORT
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echo "Choose what size of Diffie-Hellman key you want to use:"
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echo " 1) 2048 bits (fastest)"
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echo " 2) 3072 bits (recommended, best compromise)"
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echo " 3) 4096 bits (most secure)"
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while [[ $DH_KEY_SIZE != "1" && $DH_KEY_SIZE != "2" && $DH_KEY_SIZE != "3" ]]; do
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read -p "DH key size [1-3]: " -e -i 2 DH_KEY_SIZE
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done
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case $DH_KEY_SIZE in
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1)
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DH_KEY_SIZE="2048"
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;;
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2)
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DH_KEY_SIZE="3072"
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;;
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3)
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DH_KEY_SIZE="4096"
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;;
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esac
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echo ""
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echo "Which DNS do you want to use with the VPN?"
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echo " 1) Current system resolvers"
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echo " 2) Google"
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echo " 3) OpenDNS"
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echo " 4) NTT"
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echo " 5) Hurricane Electric"
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echo " 6) Verisign"
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read -p "DNS [1-6]: " -e -i 1 DNS
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echo "Choose what size of RSA key you want to use:"
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echo " 1) 2048 bits (fastest)"
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echo " 2) 3072 bits (recommended, best compromise)"
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echo " 3) 4096 bits (most secure)"
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while [[ $RSA_KEY_SIZE != "1" && $RSA_KEY_SIZE != "2" && $RSA_KEY_SIZE != "3" ]]; do
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read -p "DH key size [1-3]: " -e -i 2 RSA_KEY_SIZE
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done
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case $RSA_KEY_SIZE in
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1)
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RSA_KEY_SIZE="2048"
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;;
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2)
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RSA_KEY_SIZE="3072"
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;;
|
||||
3)
|
||||
RSA_KEY_SIZE="4096"
|
||||
;;
|
||||
esac
|
||||
echo ""
|
||||
echo "Finally, tell me your name for the client certificate"
|
||||
echo "Finally, tell me a name for the client certificate and configuration"
|
||||
while [[ $CLIENT = "" ]]; do
|
||||
echo "Please, use one word only, no special characters"
|
||||
read -p "Client name: " -e -i client CLIENT
|
||||
done
|
||||
echo ""
|
||||
echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now"
|
||||
read -n1 -r -p "Press any key to continue..."
|
||||
|
||||
if [[ "$OS" = 'debian' ]]; then
|
||||
apt-get install ca-certificates -y
|
||||
# We add the OpenVPN repo to get the latest version.
|
||||
# Debian 7
|
||||
if [[ "$VERSION_ID" = 'VERSION_ID="7"' ]]; then
|
||||
echo "deb http://build.openvpn.net/debian/openvpn/stable wheezy main" > /etc/apt/sources.list.d/openvpn.list
|
||||
wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
|
||||
apt-get update
|
||||
apt-get install openvpn iptables openssl ca-certificates -y
|
||||
else
|
||||
# Else, the distro is CentOS
|
||||
yum install epel-release -y
|
||||
yum install openvpn iptables openssl wget ca-certificates -y
|
||||
fi
|
||||
# Debian 8
|
||||
if [[ "$VERSION_ID" = 'VERSION_ID="8"' ]]; then
|
||||
echo "deb http://build.openvpn.net/debian/openvpn/stable jessie main" > /etc/apt/sources.list.d/openvpn.list
|
||||
wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
|
||||
apt update
|
||||
fi
|
||||
# Ubuntu 12.04
|
||||
if [[ "$VERSION_ID" = 'VERSION_ID="12.04"' ]]; then
|
||||
echo "deb http://build.openvpn.net/debian/openvpn/stable precise main" > /etc/apt/sources.list.d/openvpn.list
|
||||
wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
|
||||
apt-get update
|
||||
fi
|
||||
# Ubuntu 14.04
|
||||
if [[ "$VERSION_ID" = 'VERSION_ID="14.04"' ]]; then
|
||||
echo "deb http://build.openvpn.net/debian/openvpn/stable trusty main" > /etc/apt/sources.list.d/openvpn.list
|
||||
wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
|
||||
apt-get update
|
||||
fi
|
||||
# Ubuntu >= 16.04 and Debian > 8 have OpenVPN > 2.3.3 without the need of a third party repository.
|
||||
# The we install OpenVPN
|
||||
apt-get install openvpn iptables openssl wget ca-certificates curl -y
|
||||
elif [[ "$OS" = 'centos' ]]; then
|
||||
yum install epel-release -y
|
||||
yum install openvpn iptables openssl wget ca-certificates curl -y
|
||||
else
|
||||
# Else, the distro is ArchLinux
|
||||
echo ""
|
||||
echo ""
|
||||
echo "As you're using ArchLinux, I need to update the packages on your system to install those I need."
|
||||
echo "Not doing that could cause problems between dependencies, or missing files in repositories."
|
||||
echo ""
|
||||
echo "Continuing will update your installed packages and install needed ones."
|
||||
while [[ $CONTINUE != "y" && $CONTINUE != "n" ]]; do
|
||||
read -p "Continue ? [y/n]: " -e -i y CONTINUE
|
||||
done
|
||||
if [[ "$CONTINUE" = "n" ]]; then
|
||||
echo "Ok, bye !"
|
||||
exit 4
|
||||
fi
|
||||
|
||||
if [[ "$OS" = 'arch' ]]; then
|
||||
# Install rc.local
|
||||
echo "[Unit]
|
||||
Description=/etc/rc.local compatibility
|
||||
|
||||
[Service]
|
||||
Type=oneshot
|
||||
ExecStart=/etc/rc.local
|
||||
RemainAfterExit=yes
|
||||
|
||||
[Install]
|
||||
WantedBy=multi-user.target" > /etc/systemd/system/rc-local.service
|
||||
chmod +x /etc/rc.local
|
||||
systemctl enable rc-local.service
|
||||
if ! grep '#!' $RCLOCAL; then
|
||||
echo "#!/bin/bash" > $RCLOCAL
|
||||
fi
|
||||
fi
|
||||
|
||||
# Install dependencies
|
||||
pacman -Syu openvpn iptables openssl wget ca-certificates curl --needed --noconfirm
|
||||
if [[ "$OS" = 'arch' ]]; then
|
||||
touch /etc/iptables/iptables.rules # iptables won't start if this file does not exist
|
||||
systemctl enable iptables
|
||||
systemctl start iptables
|
||||
fi
|
||||
fi
|
||||
# Find out if the machine uses nogroup or nobody for the permissionless group
|
||||
if grep -qs "^nogroup:" /etc/group; then
|
||||
NOGROUP=nogroup
|
||||
else
|
||||
NOGROUP=nobody
|
||||
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/
|
||||
wget -O ~/EasyRSA-3.0.3.tgz https://github.com/OpenVPN/easy-rsa/releases/download/v3.0.3/EasyRSA-3.0.3.tgz
|
||||
tar xzf ~/EasyRSA-3.0.3.tgz -C ~/
|
||||
mv ~/EasyRSA-3.0.3/ /etc/openvpn/
|
||||
mv /etc/openvpn/EasyRSA-3.0.3/ /etc/openvpn/easy-rsa/
|
||||
chown -R root:root /etc/openvpn/easy-rsa/
|
||||
rm -rf ~/EasyRSA-3.0.1.tgz
|
||||
rm -rf ~/EasyRSA-3.0.3.tgz
|
||||
cd /etc/openvpn/easy-rsa/
|
||||
echo "set_var EASYRSA_KEY_SIZE $RSA_KEY_SIZE" > vars
|
||||
# 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
|
||||
openssl dhparam -out dh.pem $DH_KEY_SIZE
|
||||
./easyrsa build-server-full server nopass
|
||||
./easyrsa build-client-full $CLIENT nopass
|
||||
./easyrsa gen-crl
|
||||
# Move the stuff we need
|
||||
cp pki/ca.crt pki/private/ca.key pki/dh.pem pki/issued/server.crt pki/private/server.key pki/crl.pem /etc/openvpn
|
||||
# CRL is read with each client connection, when OpenVPN is dropped to nobody
|
||||
chown nobody:$GROUPNAME /etc/openvpn/crl.pem
|
||||
# Generate key for tls-auth
|
||||
openvpn --genkey --secret /etc/openvpn/ta.key
|
||||
# generate tls-auth key
|
||||
openvpn --genkey --secret /etc/openvpn/tls-auth.key
|
||||
# Move all the generated files
|
||||
cp pki/ca.crt pki/private/ca.key dh.pem pki/issued/server.crt pki/private/server.key /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn
|
||||
# Make cert revocation list readable for non-root
|
||||
chmod 644 /etc/openvpn/crl.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
|
||||
echo "local $IP" > /etc/openvpn/server.conf
|
||||
echo "port $PORT" >> /etc/openvpn/server.conf
|
||||
if [[ "$PROTOCOL" = 'UDP' ]]; then
|
||||
echo "proto udp" >> /etc/openvpn/server.conf
|
||||
elif [[ "$PROTOCOL" = 'TCP' ]]; then
|
||||
echo "proto tcp" >> /etc/openvpn/server.conf
|
||||
fi
|
||||
echo "dev tun
|
||||
user nobody
|
||||
group $NOGROUP
|
||||
persist-key
|
||||
persist-tun
|
||||
keepalive 10 120
|
||||
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
|
||||
ifconfig-pool-persist ipp.txt" >> /etc/openvpn/server.conf
|
||||
# DNS resolvers
|
||||
case $DNS in
|
||||
1)
|
||||
# Obtain the resolvers from resolv.conf and use them for OpenVPN
|
||||
|
|
@ -277,56 +451,54 @@ ifconfig-pool-persist ipp.txt" > /etc/openvpn/server.conf
|
|||
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
|
||||
2) #FDN
|
||||
echo 'push "dhcp-option DNS 80.67.169.12"' >> /etc/openvpn/server.conf
|
||||
echo 'push "dhcp-option DNS 80.67.169.40"' >> /etc/openvpn/server.conf
|
||||
;;
|
||||
3)
|
||||
3) #DNS.WATCH
|
||||
echo 'push "dhcp-option DNS 84.200.69.80"' >> /etc/openvpn/server.conf
|
||||
echo 'push "dhcp-option DNS 84.200.70.40"' >> /etc/openvpn/server.conf
|
||||
;;
|
||||
4) #OpenDNS
|
||||
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) #Google
|
||||
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
|
||||
;;
|
||||
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
|
||||
6) #Yandex Basic
|
||||
echo 'push "dhcp-option DNS 77.88.8.8"' >> /etc/openvpn/server.conf
|
||||
echo 'push "dhcp-option DNS 77.88.8.1"' >> /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
|
||||
echo 'push "redirect-gateway def1 bypass-dhcp" '>> /etc/openvpn/server.conf
|
||||
echo "crl-verify crl.pem
|
||||
ca ca.crt
|
||||
cert server.crt
|
||||
key server.key
|
||||
tls-auth tls-auth.key 0
|
||||
dh dh.pem
|
||||
auth SHA256
|
||||
$CIPHER
|
||||
tls-server
|
||||
tls-version-min 1.2
|
||||
tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
|
||||
status openvpn.log
|
||||
verb 3" >> /etc/openvpn/server.conf
|
||||
|
||||
# Create the sysctl configuration file if needed (mainly for Arch Linux)
|
||||
if [[ ! -e $SYSCTL ]]; then
|
||||
touch $SYSCTL
|
||||
fi
|
||||
|
||||
# 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
|
||||
sed -i '/\<net.ipv4.ip_forward\>/c\net.ipv4.ip_forward=1' $SYSCTL
|
||||
if ! grep -q "\<net.ipv4.ip_forward\>" $SYSCTL; then
|
||||
echo 'net.ipv4.ip_forward=1' >> $SYSCTL
|
||||
fi
|
||||
# Avoid an unneeded reboot
|
||||
echo 1 > /proc/sys/net/ipv4/ip_forward
|
||||
if pgrep firewalld; then
|
||||
# Using both permanent and not permanent rules to avoid a firewalld
|
||||
# reload.
|
||||
# We don't use --add-service=openvpn because that would only work with
|
||||
# the default port and protocol.
|
||||
firewall-cmd --zone=public --add-port=$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
|
||||
|
|
@ -334,29 +506,54 @@ 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
|
||||
iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
|
||||
sed -i "1 a\iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE" $RCLOCAL
|
||||
if pgrep firewalld; then
|
||||
# We don't use --add-service=openvpn because that would only work with
|
||||
# the default port. Using both permanent and not permanent rules to
|
||||
# avoid a firewalld reload.
|
||||
if [[ "$PROTOCOL" = 'UDP' ]]; then
|
||||
firewall-cmd --zone=public --add-port=$PORT/udp
|
||||
firewall-cmd --permanent --zone=public --add-port=$PORT/udp
|
||||
elif [[ "$PROTOCOL" = 'TCP' ]]; then
|
||||
firewall-cmd --zone=public --add-port=$PORT/tcp
|
||||
firewall-cmd --permanent --zone=public --add-port=$PORT/tcp
|
||||
fi
|
||||
firewall-cmd --zone=trusted --add-source=10.8.0.0/24
|
||||
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 $PORT -j ACCEPT
|
||||
if [[ "$PROTOCOL" = 'UDP' ]]; then
|
||||
iptables -I INPUT -p udp --dport $PORT -j ACCEPT
|
||||
elif [[ "$PROTOCOL" = 'TCP' ]]; then
|
||||
iptables -I INPUT -p tcp --dport $PORT -j ACCEPT
|
||||
fi
|
||||
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" $RCLOCAL
|
||||
if [[ "$PROTOCOL" = 'UDP' ]]; then
|
||||
sed -i "1 a\iptables -I INPUT -p udp --dport $PORT -j ACCEPT" $RCLOCAL
|
||||
elif [[ "$PROTOCOL" = 'TCP' ]]; then
|
||||
sed -i "1 a\iptables -I INPUT -p tcp --dport $PORT -j ACCEPT" $RCLOCAL
|
||||
fi
|
||||
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" $RCLOCAL
|
||||
fi
|
||||
fi
|
||||
# If SELinux is enabled and a custom port or TCP was selected, we need this
|
||||
# If SELinux is enabled and a custom port was selected, we need this
|
||||
if hash sestatus 2>/dev/null; then
|
||||
if sestatus | grep "Current mode" | grep -qs "enforcing"; then
|
||||
if [[ "$PORT" != '1194' || "$PROTOCOL" = 'tcp' ]]; then
|
||||
if [[ "$PORT" != '1194' ]]; 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 $PORT
|
||||
if [[ "$PROTOCOL" = 'UDP' ]]; then
|
||||
semanage port -a -t openvpn_port_t -p udp $PORT
|
||||
elif [[ "$PROTOCOL" = 'TCP' ]]; then
|
||||
semanage port -a -t openvpn_port_t -p tcp $PORT
|
||||
fi
|
||||
fi
|
||||
fi
|
||||
fi
|
||||
|
|
@ -364,55 +561,85 @@ exit 0' > $RCLOCAL
|
|||
if [[ "$OS" = 'debian' ]]; then
|
||||
# Little hack to check for systemd
|
||||
if pgrep systemd-journal; then
|
||||
if [[ "$VERSION_ID" = 'VERSION_ID="9"' ]]; then
|
||||
#Workaround to fix OpenVPN service on Debian 9 OpenVZ
|
||||
sed -i 's|LimitNPROC|#LimitNPROC|' /lib/systemd/system/openvpn-server\@.service
|
||||
sed -i 's|/etc/openvpn/server|/etc/openvpn|' /lib/systemd/system/openvpn-server\@.service
|
||||
sed -i 's|%i.conf|server.conf|' /lib/systemd/system/openvpn-server\@.service
|
||||
systemctl daemon-reload
|
||||
systemctl restart openvpn-server@openvpn.service
|
||||
systemctl enable openvpn-server@openvpn.service
|
||||
else
|
||||
systemctl restart openvpn@server.service
|
||||
fi
|
||||
else
|
||||
/etc/init.d/openvpn restart
|
||||
fi
|
||||
else
|
||||
if pgrep systemd-journal; then
|
||||
if [[ "$OS" = 'arch' ]]; then
|
||||
#Workaround to avoid rewriting the entire script for Arch
|
||||
sed -i 's|/etc/openvpn/server|/etc/openvpn|' /usr/lib/systemd/system/openvpn-server@.service
|
||||
sed -i 's|%i.conf|server.conf|' /usr/lib/systemd/system/openvpn-server@.service
|
||||
systemctl daemon-reload
|
||||
systemctl restart openvpn-server@openvpn.service
|
||||
systemctl enable openvpn-server@openvpn.service
|
||||
else
|
||||
systemctl restart openvpn@server.service
|
||||
systemctl enable openvpn@server.service
|
||||
fi
|
||||
else
|
||||
service openvpn restart
|
||||
chkconfig openvpn on
|
||||
fi
|
||||
fi
|
||||
# Try to detect a NATed connection and ask about it to potential LowEndSpirit users
|
||||
EXTERNALIP=$(wget -4qO- "http://whatismyip.akamai.com/")
|
||||
# Try to detect a NATed connection and ask about it to potential LowEndSpirit/Scaleway users
|
||||
EXTERNALIP=$(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 (e.g. LowEndSpirit), I need to know the external IP"
|
||||
echo "If your server is NATed (e.g. LowEndSpirit, Scaleway, or behind a router),"
|
||||
echo "then I need to know the address that can be used to access it from outside."
|
||||
echo "If that's not the case, just ignore this and leave the next field blank"
|
||||
read -p "External IP: " -e USEREXTERNALIP
|
||||
read -p "External IP or domain name: " -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
|
||||
# client-template.txt is created so we have a template to add further users later
|
||||
echo "client" > /etc/openvpn/client-template.txt
|
||||
if [[ "$PROTOCOL" = 'UDP' ]]; then
|
||||
echo "proto udp" >> /etc/openvpn/client-template.txt
|
||||
elif [[ "$PROTOCOL" = 'TCP' ]]; then
|
||||
echo "proto tcp-client" >> /etc/openvpn/client-template.txt
|
||||
fi
|
||||
echo "remote $IP $PORT
|
||||
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
|
||||
auth SHA256
|
||||
$CIPHER
|
||||
tls-client
|
||||
tls-version-min 1.2
|
||||
tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
|
||||
setenv opt block-outside-dns
|
||||
key-direction 1
|
||||
verb 3" > /etc/openvpn/client-common.txt
|
||||
# Generates the custom client.ovpn
|
||||
verb 3" >> /etc/openvpn/client-template.txt
|
||||
|
||||
# Generate the custom client.ovpn
|
||||
newclient "$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!"
|
||||
echo "Your client config is available at $homeDir/$CLIENT.ovpn"
|
||||
echo "If you want to add more clients, you simply need to run this script another time!"
|
||||
fi
|
||||
exit 0;
|
||||
|
||||
# routing
|
||||
iptables -t nat -F POSTROUTING
|
||||
echo 1 > /proc/sys/net/ipv4/ip_forward
|
||||
iptables -t nat -A POSTROUTING -o eth0 -s 10.8.0.0/24 -j MASQUERADE
|
||||
|
|
|
|||
Loading…
Reference in a new issue