Merge c5deff0e8d into 61d89e3ba2
This commit is contained in:
Sayem Chowdhury
GitHub
commit
7f9be5e4ca
1 changed files with 79 additions and 52 deletions
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@ -3,17 +3,19 @@
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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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# Verify root
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if [[ "$EUID" -ne 0 ]]; then
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echo "Sorry, you need to run this as root"
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exit 1
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fi
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# Verify tun
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if [[ ! -e /dev/net/tun ]]; then
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echo "TUN is not available"
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exit 2
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fi
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# Check if CentOS 5
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if grep -qs "CentOS release 5" "/etc/redhat-release"; then
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echo "CentOS 5 is too old and not supported"
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exit 3
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@ -22,7 +24,7 @@ fi
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if [[ -e /etc/debian_version ]]; then
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OS="debian"
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# Getting the version number, to verify that a recent version of OpenVPN is available
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VERSION_ID=$(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"' ]]; then
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@ -33,7 +35,7 @@ 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 +61,30 @@ 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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# Try to get our IP from the system and fallback to the Internet.
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@ -106,14 +110,14 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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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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@ -132,22 +136,22 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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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 $CLIENT
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EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
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rm -rf pki/reqs/$CLIENT.req
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rm -rf pki/private/$CLIENT.key
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rm -rf pki/issued/$CLIENT.crt
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rm -rf /etc/openvpn/crl.pem
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rm -rf "pki/reqs/$CLIENT.req"
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rm -rf "pki/private/$CLIENT.key"
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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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chmod 644 /etc/openvpn/crl.pem
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rm -rf $(find /home -maxdepth 2 | grep $CLIENT.ovpn) 2>/dev/null
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rm -rf /root/$CLIENT.ovpn 2>/dev/null
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rm -rf "$(find /home -maxdepth 2 | grep $CLIENT.ovpn)" 2>/dev/null
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rm -rf "/root/$CLIENT.ovpn" 2>/dev/null
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echo ""
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echo "Certificate for client $CLIENT revoked"
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echo "Exiting..."
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@ -155,7 +159,7 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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;;
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3)
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echo ""
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read -p "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
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read -rp "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
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if [[ "$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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@ -194,7 +198,7 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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for i in $OVPNS
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do
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rm $(find /home -maxdepth 2 | grep $i.ovpn) 2>/dev/null
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rm /root/$i.ovpn 2>/dev/null
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rm "/root/$i.ovpn" 2>/dev/null
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done
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rm -rf /etc/openvpn
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rm -rf /usr/share/doc/openvpn*
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@ -216,20 +220,24 @@ else
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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 "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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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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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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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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echo " 1) Current system resolvers (from /etc/resolv.conf)"
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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" && $DNS != "8" ]]; do
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read -p "DNS [1-8]: " -e -i 1 DNS
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echo " 10) Custom"
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until [[ "$DNS" =~ ^[0-9]+$ ]] && [ "$DNS" -ge 1 -a "$DNS" -le 10 ]; do
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read -rp "DNS [1-10]: " -e -i 1 DNS
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done
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if [[ $DNS = "10" ]]; then
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# Get DNS IP and validate
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until [[ "$DNS1" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; do
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read -rp "Primary DNS: " -e DNS1
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done
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until [[ "$DNS2" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; do
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read -rp "Secondary DNS: " -e DNS2
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done
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fi
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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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@ -261,7 +280,7 @@ else
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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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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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@ -286,13 +305,14 @@ else
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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 "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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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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@ -305,13 +325,14 @@ else
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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 "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 "RSA key size [1-3]: " -e -i 2 RSA_KEY_SIZE
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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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@ -324,15 +345,17 @@ else
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RSA_KEY_SIZE="4096"
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;;
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esac
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echo ""
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echo "Finally, tell me a name for the client certificate and configuration"
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while [[ $CLIENT = "" ]]; do
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echo "Please, use one word only, no special characters"
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read -p "Client name: " -e -i client CLIENT
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read -rp "Client name: " -e -i client CLIENT
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done
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echo ""
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echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now"
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read -n1 -r -p "Press any key to continue..."
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read -n1 -rp "Press any key to continue..."
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if [[ "$OS" = 'debian' ]]; then
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apt-get install ca-certificates gpg -y
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@ -437,7 +460,7 @@ WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
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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" && $CONTINUE != "n" ]]; do
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read -p "Continue ? [y/n]: " -e -i y CONTINUE
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read -rp "Continue ? [y/n]: " -e -i y CONTINUE
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done
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if [[ "$CONTINUE" = "n" ]]; then
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echo "Ok, bye !"
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@ -471,10 +494,10 @@ 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 -rf ~/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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@ -511,7 +534,7 @@ ifconfig-pool-persist ipp.txt" >> /etc/openvpn/server.conf
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case $DNS in
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1)
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# Obtain the resolvers from resolv.conf and use them for OpenVPN
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grep -v '#' /etc/resolv.conf | grep 'nameserver' | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | while read line; do
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grep -v '#' /etc/resolv.conf | grep 'nameserver' | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | while read -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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@ -546,6 +569,10 @@ ifconfig-pool-persist ipp.txt" >> /etc/openvpn/server.conf
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echo 'push "dhcp-option DNS 176.103.130.130"' >> /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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10) # Custom DNS
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echo """push "dhcp-option DNS $DNS1"""" >> /etc/openvpn/server.conf
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echo """push "dhcp-option DNS $DNS2"""" >> /etc/openvpn/server.conf
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;;
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esac
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echo 'push "redirect-gateway def1 bypass-dhcp" '>> /etc/openvpn/server.conf
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echo "crl-verify crl.pem
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@ -660,10 +687,10 @@ verb 3" >> /etc/openvpn/server.conf
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echo ""
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echo "Looks like your server is behind a NAT!"
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echo ""
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echo "If your server is NATed (e.g. LowEndSpirit, Scaleway, or behind a router),"
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echo "then I need to know the address that can be used to access it from outside."
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echo "If that's not the case, just ignore this and leave the next field blank"
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read -p "External IP or domain name: " -e USEREXTERNALIP
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echo "If your server is NATed (e.g. LowEndSpirit, Scaleway, or behind a router),"
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echo "then I need to know the address that can be used to access it from outside."
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echo "If that's not the case, just ignore this and leave the next field blank"
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read -rp "External IP or domain name: " -e USEREXTERNALIP
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if [[ "$USEREXTERNALIP" != "" ]]; then
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IP=$USEREXTERNALIP
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fi
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