Improved code (#243)
This commit is contained in:
Sayem Chowdhury
Angristan
parent
63ac18075d
commit
5501de73c8
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@ -4,16 +4,19 @@
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# https://github.com/Angristan/OpenVPN-install
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# Verify root
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if [[ "$EUID" -ne 0 ]]; then
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echo "Sorry, you need to run this as root"
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exit 1
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fi
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# Verify tun
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if [[ ! -e /dev/net/tun ]]; then
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echo "TUN is not available"
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exit 2
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fi
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# Check if CentOS 5
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if grep -qs "CentOS release 5" "/etc/redhat-release"; then
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echo "CentOS 5 is too old and not supported"
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exit 3
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@ -22,7 +25,7 @@ fi
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if [[ -e /etc/debian_version ]]; then
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OS="debian"
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# Getting the version number, to verify that a recent version of OpenVPN is available
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VERSION_ID=$(cat /etc/os-release | grep "VERSION_ID")
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VERSION_ID=$(grep "VERSION_ID" /etc/os-release)
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IPTABLES='/etc/iptables/iptables.rules'
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SYSCTL='/etc/sysctl.conf'
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if [[ "$VERSION_ID" != 'VERSION_ID="7"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="8"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="9"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="14.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="16.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="17.10"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="18.04"' ]]; then
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@ -33,7 +36,7 @@ if [[ -e /etc/debian_version ]]; then
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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" && $CONTINUE != "n" ]]; do
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read -p "Continue ? [y/n]: " -e CONTINUE
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read -rp "Continue ? [y/n]: " -e CONTINUE
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done
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if [[ "$CONTINUE" = "n" ]]; then
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echo "Ok, bye !"
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@ -59,28 +62,33 @@ 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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if [ -e "/home/$1" ]; then # if $1 is a user name
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homeDir="/home/$1"
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elif [ ${SUDO_USER} ]; then # if not, use SUDO_USER
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elif [ "${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-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/$1.ovpn
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cp /etc/openvpn/client-template.txt "$homeDir/$1.ovpn"
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{
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echo "<ca>"
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cat "/etc/openvpn/easy-rsa/pki/ca.crt"
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echo "</ca>"
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echo "<cert>"
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cat "/etc/openvpn/easy-rsa/pki/issued/$1.crt"
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echo "</cert>"
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echo "<key>"
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cat "/etc/openvpn/easy-rsa/pki/private/$1.key"
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echo "</key>"
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echo "key-direction 1"
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echo "<tls-auth>"
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cat "/etc/openvpn/tls-auth.key"
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echo "</tls-auth>"
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} >> "$homeDir/$1.ovpn"
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}
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# Get Internet network interface with default route
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@ -94,22 +102,27 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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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 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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read -rp "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 cert"
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echo "Please, use one word only, no special characters"
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read -p "Client name: " -e -i newclient CLIENT
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cd /etc/openvpn/easy-rsa/
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read -rp "Client name: " -e -i newclient CLIENT
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cd /etc/openvpn/easy-rsa/ || return
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./easyrsa build-client-full $CLIENT nopass
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# Generates the custom client.ovpn
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newclient "$CLIENT"
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echo ""
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echo "Client $CLIENT added, certs available at $homeDir/$CLIENT.ovpn"
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exit
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@ -121,16 +134,18 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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echo "You have no existing clients!"
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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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tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
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if [[ "$NUMBEROFCLIENTS" = '1' ]]; then
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read -p "Select one client [1]: " CLIENTNUMBER
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read -rp "Select one client [1]: " CLIENTNUMBER
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else
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read -p "Select one client [1-$NUMBEROFCLIENTS]: " CLIENTNUMBER
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read -rp "Select one client [1-$NUMBEROFCLIENTS]: " CLIENTNUMBER
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fi
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CLIENT=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$CLIENTNUMBER"p)
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cd /etc/openvpn/easy-rsa/
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cd /etc/openvpn/easy-rsa/ || return
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./easyrsa --batch revoke $CLIENT
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EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
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rm -f pki/reqs/$CLIENT.req
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@ -141,6 +156,7 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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chmod 644 /etc/openvpn/crl.pem
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rm -f $(find /home -maxdepth 2 | grep $CLIENT.ovpn) 2>/dev/null
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rm -f /root/$CLIENT.ovpn 2>/dev/null
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echo ""
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echo "Certificate for client $CLIENT revoked"
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echo "Exiting..."
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@ -148,7 +164,7 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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;;
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3)
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echo ""
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read -p "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
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read -rp "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
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if [[ "$REMOVE" = 'y' ]]; then
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PORT=$(grep '^port ' /etc/openvpn/server.conf | cut -d " " -f 2)
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if pgrep firewalld; then
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@ -206,6 +222,7 @@ else
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clear
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echo "Welcome to the secure OpenVPN installer (github.com/Angristan/OpenVPN-install)"
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echo ""
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# OpenVPN setup and first user creation
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echo "I need to ask you a few questions before starting the setup"
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echo "You can leave the default options and just press enter if you are ok with them"
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@ -213,23 +230,25 @@ else
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echo "I need to know the IPv4 address of the network interface you want OpenVPN listening to."
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echo "If your server is running behind a NAT, (e.g. LowEndSpirit, Scaleway) leave the IP address as it is. (local/private IP)"
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echo "Otherwise, it should be your public IPv4 address."
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# Autodetect IP address and pre-fill for the user
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IP=$(ip addr | grep 'inet' | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1)
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read -p "IP address: " -e -i $IP IP
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read -rp "IP address: " -e -i $IP IP
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echo ""
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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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read -rp "Port: " -e -i 1194 PORT
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# If $IP is a private IP address, the server must be behind NAT
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if echo "$IP" | grep -qE '^(10\.|172\.1[6789]\.|172\.2[0-9]\.|172\.3[01]\.|192\.168)'; then
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echo ""
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echo "This server is behind NAT. What is the public IPv4 address or hostname?"
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read -p "Public IP address / hostname: " -e PUBLICIP
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read -rp "Public IP address / hostname: " -e PUBLICIP
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fi
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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" && $PROTOCOL != "TCP" ]]; do
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read -p "Protocol [UDP/TCP]: " -e -i UDP PROTOCOL
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until [[ "$PROTOCOL" == "UDP" || "$PROTOCOL" == "TCP" ]]; do
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read -rp "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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@ -242,8 +261,8 @@ else
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echo " 7) Google (Anycast: worldwide)"
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echo " 8) Yandex Basic (Russia)"
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echo " 9) AdGuard DNS (Russia)"
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while [[ $DNS != "1" && $DNS != "2" && $DNS != "3" && $DNS != "4" && $DNS != "5" && $DNS != "6" && $DNS != "7" && $DNS != "8" && $DNS != "9" ]]; do
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read -p "DNS [1-9]: " -e -i 1 DNS
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until [[ "$DNS" =~ ^[0-9]+$ ]] && [ "$DNS" -ge 1 -a "$DNS" -le 9 ]; do
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read -rp "DNS [1-9]: " -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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@ -261,8 +280,8 @@ else
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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" && $CIPHER != "7" ]]; do
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read -p "Cipher [1-7]: " -e -i 1 CIPHER
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until [[ "$CIPHER" =~ ^[0-9]+$ ]] && [ "$CIPHER" -ge 1 -a "$CIPHER" -le 7 ]; do
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read -rp "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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@ -292,8 +311,8 @@ else
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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" && $DH_KEY_SIZE != "3" ]]; do
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read -p "DH key size [1-3]: " -e -i 2 DH_KEY_SIZE
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until [[ "$DH_KEY_SIZE" =~ ^[0-9]+$ ]] && [ "$DH_KEY_SIZE" -ge 1 -a "$DH_KEY_SIZE" -le 3 ]; do
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read -rp "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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@ -311,8 +330,8 @@ else
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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" && $RSA_KEY_SIZE != "3" ]]; do
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read -p "RSA key size [1-3]: " -e -i 2 RSA_KEY_SIZE
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until [[ "$RSA_KEY_SIZE" =~ ^[0-9]+$ ]] && [ "$RSA_KEY_SIZE" -ge 1 -a "$RSA_KEY_SIZE" -le 3 ]; do
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read -rp "RSA 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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@ -329,7 +348,9 @@ else
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echo "Finally, tell me a name for the client certificate and configuration"
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while [[ $CLIENT = "" ]]; do
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echo "Please, use one word only, no special characters"
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read -p "Client name: " -e -i client CLIENT
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read -rp "Client name: " -e -i client CLIENT
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# Remove special characters
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CLIENT=$(echo $CLIENT | tr -dc '[:alnum:]\n\r')
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done
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echo ""
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echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now"
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@ -437,8 +458,8 @@ WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
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echo "Not doing that could cause problems between dependencies, or missing files in repositories."
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echo ""
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echo "Continuing will update your installed packages and install needed ones."
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while [[ $CONTINUE != "y" && $CONTINUE != "n" ]]; do
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read -p "Continue ? [y/n]: " -e -i y CONTINUE
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until [[ $CONTINUE == "y" || $CONTINUE == "n" ]]; do
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read -rp "Continue ? [y/n]: " -e -i y CONTINUE
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done
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if [[ "$CONTINUE" = "n" ]]; then
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echo "Ok, bye !"
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@ -472,10 +493,10 @@ WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
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mv /etc/openvpn/EasyRSA-3.0.4/ /etc/openvpn/easy-rsa/
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chown -R root:root /etc/openvpn/easy-rsa/
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rm -f ~/EasyRSA-3.0.4.tgz
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cd /etc/openvpn/easy-rsa/
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cd /etc/openvpn/easy-rsa/ || return
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# Generate a random, alphanumeric identifier of 16 characters for CN and one for server name
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SERVER_CN="cn_$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)"
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SERVER_NAME="server_$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)"
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SERVER_CN="cn_$(tr -dc 'a-zA-Z0-9' < /dev/urandom | fold -w 16 | head -n 1)"
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SERVER_NAME="server_$(tr -dc 'a-zA-Z0-9' < /dev/urandom | fold -w 16 | head -n 1)"
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echo "set_var EASYRSA_KEY_SIZE $RSA_KEY_SIZE" > vars
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echo "set_var EASYRSA_REQ_CN $SERVER_CN" >> vars
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# Create the PKI, set up the CA, the DH params and the server + client certificates
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@ -494,11 +515,7 @@ WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
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# Generate server.conf
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echo "port $PORT" > /etc/openvpn/server.conf
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if [[ "$PROTOCOL" = 'UDP' ]]; then
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echo "proto udp" >> /etc/openvpn/server.conf
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elif [[ "$PROTOCOL" = 'TCP' ]]; then
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echo "proto tcp" >> /etc/openvpn/server.conf
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fi
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echo "proto $(echo $PROTOCOL | tr '[:upper:]' '[:lower:]')" >> /etc/openvpn/server.conf
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echo "dev tun
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user nobody
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group $NOGROUP
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@ -519,7 +536,7 @@ ifconfig-pool-persist ipp.txt" >> /etc/openvpn/server.conf
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RESOLVCONF='/etc/resolv.conf'
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fi
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# Obtain the resolvers from resolv.conf and use them for OpenVPN
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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
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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 -r line; do
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echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server.conf
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done
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;;
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@ -556,7 +573,7 @@ ifconfig-pool-persist ipp.txt" >> /etc/openvpn/server.conf
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echo 'push "dhcp-option DNS 176.103.130.131"' >> /etc/openvpn/server.conf
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;;
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esac
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echo 'push "redirect-gateway def1 bypass-dhcp" '>> /etc/openvpn/server.conf
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echo 'push "redirect-gateway def1 bypass-dhcp" ' >> /etc/openvpn/server.conf
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echo "crl-verify crl.pem
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ca ca.crt
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cert $SERVER_NAME.crt
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@ -581,12 +598,16 @@ verb 3" >> /etc/openvpn/server.conf
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if ! grep -q "\<net.ipv4.ip_forward\>" $SYSCTL; then
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echo 'net.ipv4.ip_forward=1' >> $SYSCTL
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fi
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# Avoid an unneeded reboot
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echo 1 > /proc/sys/net/ipv4/ip_forward
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# Set NAT for the VPN subnet
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iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
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# Save persitent iptables rules
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iptables-save > $IPTABLES
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if pgrep firewalld; then
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# We don't use --add-service=openvpn because that would only work with
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# the default port. Using both permanent and not permanent rules to
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@ -601,6 +622,7 @@ verb 3" >> /etc/openvpn/server.conf
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firewall-cmd --zone=trusted --add-source=10.8.0.0/24
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firewall-cmd --permanent --zone=trusted --add-source=10.8.0.0/24
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fi
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if iptables -L -n | grep -qE 'REJECT|DROP'; then
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# If iptables has at least one REJECT rule, we asume this is needed.
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# Not the best approach but I can't think of other and this shouldn't
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@ -613,8 +635,9 @@ verb 3" >> /etc/openvpn/server.conf
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iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
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iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
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# Save persitent OpenVPN rules
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iptables-save > $IPTABLES
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iptables-save > $IPTABLES
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fi
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# If SELinux is enabled and a custom port was selected, we need this
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if hash sestatus 2>/dev/null; then
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if sestatus | grep "Current mode" | grep -qs "enforcing"; then
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@ -631,6 +654,7 @@ verb 3" >> /etc/openvpn/server.conf
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|||
fi
|
||||
fi
|
||||
fi
|
||||
|
||||
# And finally, restart OpenVPN
|
||||
if [[ "$OS" = 'debian' ]]; then
|
||||
# Little hack to check for systemd
|
||||
|
|
@ -663,10 +687,12 @@ verb 3" >> /etc/openvpn/server.conf
|
|||
chkconfig openvpn on
|
||||
fi
|
||||
fi
|
||||
|
||||
# If the server is behind a NAT, use the correct IP address
|
||||
if [[ "$PUBLICIP" != "" ]]; then
|
||||
IP=$PUBLICIP
|
||||
fi
|
||||
|
||||
# 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
|
||||
|
|
|
|||
Loading…
Reference in New Issue