diff --git a/openvpn-install.sh b/openvpn-install.sh
index bf2f4d5..62ee62c 100644
--- a/openvpn-install.sh
+++ b/openvpn-install.sh
@@ -5,80 +5,78 @@
if [[ "$EUID" -ne 0 ]]; then
- echo "Sorry, you need to run this as root"
- exit 1
+ echo "Sorry, you need to run this as root"
+ exit 1
fi
if [[ ! -e /dev/net/tun ]]; then
- echo "TUN is not available"
- exit 2
+ echo "TUN is not available"
+ exit 2
fi
if grep -qs "CentOS release 5" "/etc/redhat-release"; then
- echo "CentOS 5 is too old and not supported"
- exit 3
+ echo "CentOS 5 is too old and not supported"
+ exit 3
fi
if [[ -e /etc/debian_version ]]; then
- OS="debian"
- # Getting the version number, to verify that a recent version of OpenVPN is available
- VERSION_ID=$(cat /etc/os-release | grep "VERSION_ID")
- RCLOCAL='/etc/rc.local'
- SYSCTL='/etc/sysctl.conf'
- 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
- echo "Your version of Debian/Ubuntu is not supported."
- echo "I can't install a recent version of OpenVPN on your system."
- echo ""
- echo "However, if you're using Debian unstable/testing, or Ubuntu beta,"
- echo "then you can continue, a recent version of OpenVPN is available on these."
- echo "Keep in mind they are not supported, though."
- while [[ $CONTINUE != "y" && $CONTINUE != "n" ]]; do
- read -p "Continue ? [y/n]: " -e CONTINUE
- done
- if [[ "$CONTINUE" = "n" ]]; then
- echo "Ok, bye !"
- exit 4
- fi
- fi
+ OS="debian"
+ # Getting the version number, to verify that a recent version of OpenVPN is available
+ VERSION_ID=$(cat /etc/os-release | grep "VERSION_ID")
+ IPTABLES='/etc/iptables/iptables.rules'
+ SYSCTL='/etc/sysctl.conf'
+ if [[ "$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
+ echo "Your version of Debian/Ubuntu is not supported."
+ echo "I can't install a recent version of OpenVPN on your system."
+ echo ""
+ echo "However, if you're using Debian unstable/testing, or Ubuntu beta,"
+ echo "then you can continue, a recent version of OpenVPN is available on these."
+ echo "Keep in mind they are not supported, though."
+ while [[ $CONTINUE != "y" && $CONTINUE != "n" ]]; do
+ read -p "Continue ? [y/n]: " -e CONTINUE
+ done
+ if [[ "$CONTINUE" = "n" ]]; then
+ echo "Ok, bye !"
+ exit 4
+ fi
+ fi
elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
- OS=centos
- RCLOCAL='/etc/rc.d/rc.local'
- SYSCTL='/etc/sysctl.conf'
- # Needed for CentOS 7
- chmod +x /etc/rc.d/rc.local
+ OS=centos
+ IPTABLES='/etc/iptables/iptables.rules'
+ SYSCTL='/etc/sysctl.conf'
elif [[ -e /etc/arch-release ]]; then
- OS=arch
- RCLOCAL='/etc/rc.local'
- SYSCTL='/etc/sysctl.d/openvpn.conf'
+ OS=arch
+ IPTABLES='/etc/iptables/iptables.rules'
+ SYSCTL='/etc/sysctl.d/openvpn.conf'
else
- echo "Looks like you aren't running this installer on a Debian, Ubuntu, CentOS or ArchLinux system"
- exit 4
+ echo "Looks like you aren't running this installer on a Debian, Ubuntu, CentOS or ArchLinux system"
+ exit 4
fi
newclient () {
- # Where to write the custom client.ovpn?
- if [ -e /home/$1 ]; then # if $1 is a user name
- homeDir="/home/$1"
- elif [ ${SUDO_USER} ]; then # if not, use SUDO_USER
- homeDir="/home/${SUDO_USER}"
- else # if not SUDO_USER, use /root
- homeDir="/root"
- fi
- # Generates the custom client.ovpn
- cp /etc/openvpn/client-template.txt $homeDir/$1.ovpn
- echo "" >> $homeDir/$1.ovpn
- cat /etc/openvpn/easy-rsa/pki/ca.crt >> $homeDir/$1.ovpn
- echo "" >> $homeDir/$1.ovpn
- echo "" >> $homeDir/$1.ovpn
- cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> $homeDir/$1.ovpn
- echo "" >> $homeDir/$1.ovpn
- echo "" >> $homeDir/$1.ovpn
- cat /etc/openvpn/easy-rsa/pki/private/$1.key >> $homeDir/$1.ovpn
- echo "" >> $homeDir/$1.ovpn
- echo "key-direction 1" >> $homeDir/$1.ovpn
- echo "" >> $homeDir/$1.ovpn
- cat /etc/openvpn/tls-auth.key >> $homeDir/$1.ovpn
- echo "" >> $homeDir/$1.ovpn
+ # Where to write the custom client.ovpn?
+ if [ -e /home/$1 ]; then # if $1 is a user name
+ homeDir="/home/$1"
+ elif [ ${SUDO_USER} ]; then # if not, use SUDO_USER
+ homeDir="/home/${SUDO_USER}"
+ else # if not SUDO_USER, use /root
+ homeDir="/root"
+ fi
+ # Generates the custom client.ovpn
+ cp /etc/openvpn/client-template.txt $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+ cat /etc/openvpn/easy-rsa/pki/ca.crt >> $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+ cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+ cat /etc/openvpn/easy-rsa/pki/private/$1.key >> $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+ echo "key-direction 1" >> $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+ cat /etc/openvpn/tls-auth.key >> $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
}
# Try to get our IP from the system and fallback to the Internet.
@@ -86,355 +84,406 @@ newclient () {
# and to avoid getting an IPv6.
IP=$(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)
if [[ "$IP" = "" ]]; then
- IP=$(wget -qO- ipv4.icanhazip.com)
+ IP=$(wget -qO- ipv4.icanhazip.com)
fi
# Get Internet network interface with default route
-NIC=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)')
+NIC=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)' | head -1)
if [[ -e /etc/openvpn/server.conf ]]; then
- while :
- do
- clear
- echo "OpenVPN-install (github.com/Angristan/OpenVPN-install)"
- echo ""
- echo "Looks like OpenVPN is already installed"
- echo ""
- echo "What do you want to do?"
- echo " 1) Add a cert for a new user"
- echo " 2) Revoke existing user cert"
- echo " 3) Remove OpenVPN"
- echo " 4) Exit"
- read -p "Select an option [1-4]: " option
- case $option in
- 1)
- echo ""
- echo "Tell me a name for the client cert"
- echo "Please, use one word only, no special characters"
- read -p "Client name: " -e -i client CLIENT
- cd /etc/openvpn/easy-rsa/
- ./easyrsa build-client-full $CLIENT nopass
- # Generates the custom client.ovpn
- newclient "$CLIENT"
- echo ""
- echo "Client $CLIENT added, certs available at $homeDir/$CLIENT.ovpn"
- exit
- ;;
- 2)
- NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep -c "^V")
- if [[ "$NUMBEROFCLIENTS" = '0' ]]; then
- echo ""
- echo "You have no existing clients!"
- exit 5
- fi
- echo ""
- echo "Select the existing client certificate you want to revoke"
- tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
- if [[ "$NUMBEROFCLIENTS" = '1' ]]; then
- read -p "Select one client [1]: " CLIENTNUMBER
- else
- read -p "Select one client [1-$NUMBEROFCLIENTS]: " CLIENTNUMBER
- fi
- CLIENT=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$CLIENTNUMBER"p)
- cd /etc/openvpn/easy-rsa/
- ./easyrsa --batch revoke $CLIENT
- EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
- rm -rf pki/reqs/$CLIENT.req
- rm -rf pki/private/$CLIENT.key
- rm -rf pki/issued/$CLIENT.crt
- rm -rf /etc/openvpn/crl.pem
- cp /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn/crl.pem
- chmod 644 /etc/openvpn/crl.pem
- echo ""
- echo "Certificate for client $CLIENT revoked"
- echo "Exiting..."
- exit
- ;;
- 3)
- echo ""
- read -p "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
- if [[ "$REMOVE" = 'y' ]]; then
- PORT=$(grep '^port ' /etc/openvpn/server.conf | cut -d " " -f 2)
- if pgrep firewalld; then
- # Using both permanent and not permanent rules to avoid a firewalld reload.
- firewall-cmd --zone=public --remove-port=$PORT/udp
- firewall-cmd --zone=trusted --remove-source=10.8.0.0/24
- firewall-cmd --permanent --zone=public --remove-port=$PORT/udp
- firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
- fi
- if iptables -L -n | grep -qE 'REJECT|DROP'; then
- sed -i "/iptables -I INPUT -p udp --dport $PORT -j ACCEPT/d" $RCLOCAL
- sed -i "/iptables -I FORWARD -s 10.8.0.0\/24 -j ACCEPT/d" $RCLOCAL
- sed -i "/iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT/d" $RCLOCAL
- fi
- sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 -j SNAT --to /d' $RCLOCAL
- if hash sestatus 2>/dev/null; then
- if sestatus | grep "Current mode" | grep -qs "enforcing"; then
- if [[ "$PORT" != '1194' ]]; then
- semanage port -d -t openvpn_port_t -p udp $PORT
- fi
- fi
- fi
- if [[ "$OS" = 'debian' ]]; then
- apt-get autoremove --purge -y openvpn
- elif [[ "$OS" = 'arch' ]]; then
- pacman -R openvpn --noconfirm
- else
- yum remove openvpn -y
- fi
- rm -rf /etc/openvpn
- rm -rf /usr/share/doc/openvpn*
- echo ""
- echo "OpenVPN removed!"
- else
- echo ""
- echo "Removal aborted!"
- fi
- exit
- ;;
- 4) exit;;
- esac
- done
+ while :
+ do
+ clear
+ echo "OpenVPN-install (github.com/Angristan/OpenVPN-install)"
+ echo ""
+ echo "Looks like OpenVPN is already installed"
+ echo ""
+ echo "What do you want to do?"
+ echo " 1) Add a cert for a new user"
+ echo " 2) Revoke existing user cert"
+ echo " 3) Remove OpenVPN"
+ echo " 4) Exit"
+ read -p "Select an option [1-4]: " option
+ case $option in
+ 1)
+ echo ""
+ echo "Tell me a name for the client cert"
+ echo "Please, use one word only, no special characters"
+ read -p "Client name: " -e -i client CLIENT
+ cd /etc/openvpn/easy-rsa/
+ ./easyrsa build-client-full $CLIENT nopass
+ # Generates the custom client.ovpn
+ newclient "$CLIENT"
+ echo ""
+ echo "Client $CLIENT added, certs available at $homeDir/$CLIENT.ovpn"
+ exit
+ ;;
+ 2)
+ NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep -c "^V")
+ if [[ "$NUMBEROFCLIENTS" = '0' ]]; then
+ echo ""
+ echo "You have no existing clients!"
+ exit 5
+ fi
+ echo ""
+ echo "Select the existing client certificate you want to revoke"
+ tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
+ if [[ "$NUMBEROFCLIENTS" = '1' ]]; then
+ read -p "Select one client [1]: " CLIENTNUMBER
+ else
+ read -p "Select one client [1-$NUMBEROFCLIENTS]: " CLIENTNUMBER
+ fi
+ CLIENT=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$CLIENTNUMBER"p)
+ cd /etc/openvpn/easy-rsa/
+ ./easyrsa --batch revoke $CLIENT
+ EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
+ rm -rf pki/reqs/$CLIENT.req
+ rm -rf pki/private/$CLIENT.key
+ rm -rf pki/issued/$CLIENT.crt
+ rm -rf /etc/openvpn/crl.pem
+ cp /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn/crl.pem
+ chmod 644 /etc/openvpn/crl.pem
+ echo ""
+ echo "Certificate for client $CLIENT revoked"
+ echo "Exiting..."
+ exit
+ ;;
+ 3)
+ echo ""
+ read -p "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
+ if [[ "$REMOVE" = 'y' ]]; then
+ PORT=$(grep '^port ' /etc/openvpn/server.conf | cut -d " " -f 2)
+ if pgrep firewalld; then
+ # Using both permanent and not permanent rules to avoid a firewalld reload.
+ firewall-cmd --zone=public --remove-port=$PORT/udp
+ firewall-cmd --zone=trusted --remove-source=10.8.0.0/24
+ firewall-cmd --permanent --zone=public --remove-port=$PORT/udp
+ firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
+ fi
+ if iptables -L -n | grep -qE 'REJECT|DROP'; then
+ if [[ "$PROTOCOL" = 'udp' ]]; then
+ iptables -D INPUT -p udp --dport $PORT -j ACCEPT
+ else
+ iptables -D INPUT -p tcp --dport $PORT -j ACCEPT
+ fi
+ iptables -D FORWARD -s 10.8.0.0/24 -j ACCEPT
+ iptables-save > $IPTABLES
+ fi
+ iptables -t nat -D POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
+ iptables-save > $IPTABLES
+ if hash sestatus 2>/dev/null; then
+ if sestatus | grep "Current mode" | grep -qs "enforcing"; then
+ if [[ "$PORT" != '1194' ]]; then
+ semanage port -d -t openvpn_port_t -p udp $PORT
+ fi
+ fi
+ fi
+ if [[ "$OS" = 'debian' ]]; then
+ apt-get autoremove --purge -y openvpn
+ elif [[ "$OS" = 'arch' ]]; then
+ pacman -R openvpn --noconfirm
+ else
+ yum remove openvpn -y
+ fi
+ rm -rf /etc/openvpn
+ rm -rf /usr/share/doc/openvpn*
+ echo ""
+ echo "OpenVPN removed!"
+ else
+ echo ""
+ echo "Removal aborted!"
+ fi
+ exit
+ ;;
+ 4) exit;;
+ esac
+ done
else
- clear
- echo "Welcome to the secure OpenVPN installer (github.com/Angristan/OpenVPN-install)"
- echo ""
- # OpenVPN setup and first user creation
- echo "I need to ask you a few questions before starting the setup"
- echo "You can leave the default options and just press enter if you are ok with them"
- echo ""
- echo "I need to know the IPv4 address of the network interface you want OpenVPN listening to."
- echo "If your server is running behind a NAT, (e.g. LowEndSpirit, Scaleway) leave the IP address as it is. (local/private IP)"
- echo "Otherwise, it should be your public IPv4 address."
- read -p "IP address: " -e -i $IP IP
- echo ""
- echo "What port do you want for OpenVPN?"
- read -p "Port: " -e -i 1194 PORT
- echo ""
- echo "What protocol do you want for OpenVPN?"
- echo "Unless UDP is blocked, you should not use TCP (unnecessarily slower)"
- while [[ $PROTOCOL != "UDP" && $PROTOCOL != "TCP" ]]; do
- read -p "Protocol [UDP/TCP]: " -e -i UDP PROTOCOL
- done
- echo ""
- echo "What DNS do you want to use with the VPN?"
- echo " 1) Current system resolvers (in /etc/resolv.conf)"
- echo " 2) FDN (France)"
- echo " 3) DNS.WATCH (Germany)"
- echo " 4) OpenDNS (Anycast: worldwide)"
- echo " 5) Google (Anycast: worldwide)"
- echo " 6) Yandex Basic (Russia)"
- echo " 7) AdGuard DNS (Russia)"
- while [[ $DNS != "1" && $DNS != "2" && $DNS != "3" && $DNS != "4" && $DNS != "5" && $DNS != "6" && $DNS != "7" ]]; do
- read -p "DNS [1-7]: " -e -i 1 DNS
- done
- echo ""
- echo "See https://github.com/Angristan/OpenVPN-install#encryption to learn more about "
- echo "the encryption in OpenVPN and the choices I made in this script."
- echo "Please note that all the choices proposed are secure (to a different degree)"
- echo "and are still viable to date, unlike some default OpenVPN options"
- echo ''
- echo "Choose which cipher you want to use for the data channel:"
- echo " 1) AES-128-CBC (fastest and sufficiently secure for everyone, recommended)"
- echo " 2) AES-192-CBC"
- echo " 3) AES-256-CBC"
- echo "Alternatives to AES, use them only if you know what you're doing."
- echo "They are relatively slower but as secure as AES."
- echo " 4) CAMELLIA-128-CBC"
- echo " 5) CAMELLIA-192-CBC"
- echo " 6) CAMELLIA-256-CBC"
- echo " 7) SEED-CBC"
- while [[ $CIPHER != "1" && $CIPHER != "2" && $CIPHER != "3" && $CIPHER != "4" && $CIPHER != "5" && $CIPHER != "6" && $CIPHER != "7" ]]; do
- read -p "Cipher [1-7]: " -e -i 1 CIPHER
- done
- case $CIPHER in
- 1)
- CIPHER="cipher AES-128-CBC"
- ;;
- 2)
- CIPHER="cipher AES-192-CBC"
- ;;
- 3)
- CIPHER="cipher AES-256-CBC"
- ;;
- 4)
- CIPHER="cipher CAMELLIA-128-CBC"
- ;;
- 5)
- CIPHER="cipher CAMELLIA-192-CBC"
- ;;
- 6)
- CIPHER="cipher CAMELLIA-256-CBC"
- ;;
- 7)
- CIPHER="cipher SEED-CBC"
- ;;
- esac
- echo ""
- echo "Choose what size of Diffie-Hellman key you want to use:"
- echo " 1) 2048 bits (fastest)"
- echo " 2) 3072 bits (recommended, best compromise)"
- echo " 3) 4096 bits (most secure)"
- while [[ $DH_KEY_SIZE != "1" && $DH_KEY_SIZE != "2" && $DH_KEY_SIZE != "3" ]]; do
- read -p "DH key size [1-3]: " -e -i 2 DH_KEY_SIZE
- done
- case $DH_KEY_SIZE in
- 1)
- DH_KEY_SIZE="2048"
- ;;
- 2)
- DH_KEY_SIZE="3072"
- ;;
- 3)
- DH_KEY_SIZE="4096"
- ;;
- esac
- echo ""
- echo "Choose what size of RSA key you want to use:"
- echo " 1) 2048 bits (fastest)"
- echo " 2) 3072 bits (recommended, best compromise)"
- echo " 3) 4096 bits (most secure)"
- while [[ $RSA_KEY_SIZE != "1" && $RSA_KEY_SIZE != "2" && $RSA_KEY_SIZE != "3" ]]; do
- read -p "RSA key size [1-3]: " -e -i 2 RSA_KEY_SIZE
- done
- case $RSA_KEY_SIZE in
- 1)
- RSA_KEY_SIZE="2048"
- ;;
- 2)
- RSA_KEY_SIZE="3072"
- ;;
- 3)
- RSA_KEY_SIZE="4096"
- ;;
- esac
- echo ""
- 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 [[ "$VERSION_ID" = 'VERSION_ID="7"' ]]; then
- echo "deb http://build.openvpn.net/debian/openvpn/stable wheezy main" > /etc/apt/sources.list.d/openvpn.list
- wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
- apt-get update
- fi
- # Debian 8
- if [[ "$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
+ clear
+ echo "Welcome to the secure OpenVPN installer (github.com/Angristan/OpenVPN-install)"
+ echo ""
+ # OpenVPN setup and first user creation
+ echo "I need to ask you a few questions before starting the setup"
+ echo "You can leave the default options and just press enter if you are ok with them"
+ echo ""
+ echo "I need to know the IPv4 address of the network interface you want OpenVPN listening to."
+ echo "If your server is running behind a NAT, (e.g. LowEndSpirit, Scaleway) leave the IP address as it is. (local/private IP)"
+ echo "Otherwise, it should be your public IPv4 address."
+ read -p "IP address: " -e -i $IP IP
+ echo ""
+ echo "What port do you want for OpenVPN?"
+ read -p "Port: " -e -i 1194 PORT
+ echo ""
+ echo "What protocol do you want for OpenVPN?"
+ echo "Unless UDP is blocked, you should not use TCP (unnecessarily slower)"
+ while [[ $PROTOCOL != "UDP" && $PROTOCOL != "TCP" ]]; do
+ read -p "Protocol [UDP/TCP]: " -e -i UDP PROTOCOL
+ done
+ echo ""
+ echo "What DNS do you want to use with the VPN?"
+ echo " 1) Current system resolvers (in /etc/resolv.conf)"
+ echo " 2) FDN (France)"
+ echo " 3) DNS.WATCH (Germany)"
+ echo " 4) OpenDNS (Anycast: worldwide)"
+ echo " 5) Google (Anycast: worldwide)"
+ echo " 6) Yandex Basic (Russia)"
+ echo " 7) AdGuard DNS (Russia)"
+ while [[ $DNS != "1" && $DNS != "2" && $DNS != "3" && $DNS != "4" && $DNS != "5" && $DNS != "6" && $DNS != "7" ]]; do
+ read -p "DNS [1-7]: " -e -i 1 DNS
+ done
+ echo ""
+ echo "See https://github.com/Angristan/OpenVPN-install#encryption to learn more about "
+ echo "the encryption in OpenVPN and the choices I made in this script."
+ echo "Please note that all the choices proposed are secure (to a different degree)"
+ echo "and are still viable to date, unlike some default OpenVPN options"
+ echo ''
+ echo "Choose which cipher you want to use for the data channel:"
+ echo " 1) AES-128-CBC (fastest and sufficiently secure for everyone, recommended)"
+ echo " 2) AES-192-CBC"
+ echo " 3) AES-256-CBC"
+ echo "Alternatives to AES, use them only if you know what you're doing."
+ echo "They are relatively slower but as secure as AES."
+ echo " 4) CAMELLIA-128-CBC"
+ echo " 5) CAMELLIA-192-CBC"
+ echo " 6) CAMELLIA-256-CBC"
+ echo " 7) SEED-CBC"
+ while [[ $CIPHER != "1" && $CIPHER != "2" && $CIPHER != "3" && $CIPHER != "4" && $CIPHER != "5" && $CIPHER != "6" && $CIPHER != "7" ]]; do
+ read -p "Cipher [1-7]: " -e -i 1 CIPHER
+ done
+ case $CIPHER in
+ 1)
+ CIPHER="cipher AES-128-CBC"
+ ;;
+ 2)
+ CIPHER="cipher AES-192-CBC"
+ ;;
+ 3)
+ CIPHER="cipher AES-256-CBC"
+ ;;
+ 4)
+ CIPHER="cipher CAMELLIA-128-CBC"
+ ;;
+ 5)
+ CIPHER="cipher CAMELLIA-192-CBC"
+ ;;
+ 6)
+ CIPHER="cipher CAMELLIA-256-CBC"
+ ;;
+ 7)
+ CIPHER="cipher SEED-CBC"
+ ;;
+ esac
+ echo ""
+ echo "Choose what size of Diffie-Hellman key you want to use:"
+ echo " 1) 2048 bits (fastest)"
+ echo " 2) 3072 bits (recommended, best compromise)"
+ echo " 3) 4096 bits (most secure)"
+ while [[ $DH_KEY_SIZE != "1" && $DH_KEY_SIZE != "2" && $DH_KEY_SIZE != "3" ]]; do
+ read -p "DH key size [1-3]: " -e -i 2 DH_KEY_SIZE
+ done
+ case $DH_KEY_SIZE in
+ 1)
+ DH_KEY_SIZE="2048"
+ ;;
+ 2)
+ DH_KEY_SIZE="3072"
+ ;;
+ 3)
+ DH_KEY_SIZE="4096"
+ ;;
+ esac
+ echo ""
+ echo "Choose what size of RSA key you want to use:"
+ echo " 1) 2048 bits (fastest)"
+ echo " 2) 3072 bits (recommended, best compromise)"
+ echo " 3) 4096 bits (most secure)"
+ while [[ $RSA_KEY_SIZE != "1" && $RSA_KEY_SIZE != "2" && $RSA_KEY_SIZE != "3" ]]; do
+ read -p "RSA key size [1-3]: " -e -i 2 RSA_KEY_SIZE
+ done
+ case $RSA_KEY_SIZE in
+ 1)
+ RSA_KEY_SIZE="2048"
+ ;;
+ 2)
+ RSA_KEY_SIZE="3072"
+ ;;
+ 3)
+ RSA_KEY_SIZE="4096"
+ ;;
+ esac
+ echo ""
+ 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 [[ "$VERSION_ID" = 'VERSION_ID="7"' ]]; then
+ echo "deb http://build.openvpn.net/debian/openvpn/stable wheezy main" > /etc/apt/sources.list.d/openvpn.list
+ wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
+ apt-get update
+ fi
+ # Debian 8
+ if [[ "$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
+ # Install iptables service
+ if [[ ! -e /etc/systemd/system/iptables.service ]]; then
+ mkdir /etc/iptables
+ iptables-save > /etc/iptables/iptables.rules
+ echo "#!/bin/sh
+iptables -F
+iptables -X
+iptables -t nat -F
+iptables -t nat -X
+iptables -t mangle -F
+iptables -t mangle -X
+iptables -P INPUT ACCEPT
+iptables -P FORWARD ACCEPT
+iptables -P OUTPUT ACCEPT" > /etc/iptables/flush-iptables.sh
+ chmod +x /etc/iptables/flush-iptables.sh
+ echo "[Unit]
+Description=Packet Filtering Framework
+DefaultDependencies=no
+Before=network-pre.target
+Wants=network-pre.target
[Service]
Type=oneshot
-ExecStart=/etc/rc.local
+ExecStart=/sbin/iptables-restore /etc/iptables/iptables.rules
+ExecReload=/sbin/iptables-restore /etc/iptables/iptables.rules
+ExecStop=/etc/iptables/flush-iptables.sh
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" > $RCLOCAL
- fi
- fi
+WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
+ systemctl daemon-reload
+ systemctl enable iptables.service
+ fi
+ elif [[ "$OS" = 'centos' ]]; then
+ yum install epel-release -y
+ yum install openvpn iptables openssl wget ca-certificates curl -y
+ # Install iptables service
+ if [[ ! -e /etc/systemd/system/iptables.service ]]; then
+ mkdir /etc/iptables
+ iptables-save > /etc/iptables/iptables.rules
+ echo "#!/bin/sh
+iptables -F
+iptables -X
+iptables -t nat -F
+iptables -t nat -X
+iptables -t mangle -F
+iptables -t mangle -X
+iptables -P INPUT ACCEPT
+iptables -P FORWARD ACCEPT
+iptables -P OUTPUT ACCEPT" > /etc/iptables/flush-iptables.sh
+ chmod +x /etc/iptables/flush-iptables.sh
+ echo "[Unit]
+Description=Packet Filtering Framework
+DefaultDependencies=no
+Before=network-pre.target
+Wants=network-pre.target
+[Service]
+Type=oneshot
+ExecStart=/sbin/iptables-restore /etc/iptables/iptables.rules
+ExecReload=/sbin/iptables-restore /etc/iptables/iptables.rules
+ExecStop=/etc/iptables/flush-iptables.sh
+RemainAfterExit=yes
+[Install]
+WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
+ systemctl daemon-reload
+ systemctl enable iptables.service
+ # Disable firewalld to allow iptables to start upon reboot
+ systemctl disable firewalld
+ fi
+ 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
- # Install dependencies
- pacman -Syu openvpn iptables openssl wget ca-certificates curl --needed --noconfirm
- if [[ "$OS" = 'arch' ]]; then
- touch /etc/iptables/iptables.rules # iptables won't start if this file does not exist
- systemctl enable iptables
- systemctl start iptables
- fi
- fi
- # Find out if the machine uses nogroup or nobody for the permissionless group
- if grep -qs "^nogroup:" /etc/group; then
- NOGROUP=nogroup
- else
- NOGROUP=nobody
- fi
+ if [[ "$OS" = 'arch' ]]; then
+ # Install dependencies
+ pacman -Syu openvpn iptables openssl wget ca-certificates curl --needed --noconfirm
+ iptables-save > /etc/iptables/iptables.rules # iptables won't start if this file does not exist
+ systemctl daemon-reload
+ 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-3.0.3.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-3.0.3.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
- openssl dhparam -out dh.pem $DH_KEY_SIZE
- ./easyrsa build-server-full server nopass
- ./easyrsa build-client-full $CLIENT nopass
- EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
- # 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
+ # 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-3.0.3.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-3.0.3.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
+ openssl dhparam -out dh.pem $DH_KEY_SIZE
+ ./easyrsa build-server-full server nopass
+ ./easyrsa build-client-full $CLIENT nopass
+ EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
+ # 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 $PORT" > /etc/openvpn/server.conf
- if [[ "$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
+ # Generate 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
@@ -443,39 +492,39 @@ keepalive 10 120
topology subnet
server 10.8.0.0 255.255.255.0
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
- 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
- echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server.conf
- done
- ;;
- 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) #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
- ;;
- 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
- ;;
- 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
- ;;
- 7) #AdGuard DNS
- echo 'push "dhcp-option DNS 176.103.130.130"' >> /etc/openvpn/server.conf
- echo 'push "dhcp-option DNS 176.103.130.131"' >> /etc/openvpn/server.conf
- ;;
- esac
+ # DNS resolvers
+ case $DNS in
+ 1)
+ # Obtain the resolvers from resolv.conf and use them for OpenVPN
+ 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
+ echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server.conf
+ done
+ ;;
+ 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) #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
+ ;;
+ 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
+ ;;
+ 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
+ ;;
+ 7) #AdGuard DNS
+ echo 'push "dhcp-option DNS 176.103.130.130"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 176.103.130.131"' >> /etc/openvpn/server.conf
+ ;;
+ esac
echo 'push "redirect-gateway def1 bypass-dhcp" '>> /etc/openvpn/server.conf
echo "crl-verify crl.pem
ca ca.crt
@@ -491,134 +540,124 @@ 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
+ # 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 '/\/c\net.ipv4.ip_forward=1' $SYSCTL
- if ! grep -q "\" $SYSCTL; then
- echo 'net.ipv4.ip_forward=1' >> $SYSCTL
- fi
- # Avoid an unneeded reboot
- echo 1 > /proc/sys/net/ipv4/ip_forward
- # Needed to use rc.local with some systemd distros
- if [[ "$OS" = 'debian' && ! -e $RCLOCAL ]]; then
- echo '#!/bin/sh -e
- exit 0' > $RCLOCAL
- fi
- chmod +x $RCLOCAL
- # Set NAT for the VPN subnet
- iptables -t nat -A POSTROUTING -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=$PORT/tcp
- fi
- firewall-cmd --zone=trusted --add-source=10.8.0.0/24
- firewall-cmd --permanent --zone=trusted --add-source=10.8.0.0/24
- fi
- if iptables -L -n | grep -qE 'REJECT|DROP'; then
- # If iptables has at least one REJECT rule, we asume this is needed.
- # Not the best approach but I can't think of other and this shouldn't
- # cause problems.
- if [[ "$PROTOCOL" = 'UDP' ]]; then
- iptables -I INPUT -p udp --dport $PORT -j ACCEPT
- elif [[ "$PROTOCOL" = 'TCP' ]]; then
- iptables -I INPUT -p tcp --dport $PORT -j ACCEPT
- fi
- iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
- iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
- if [[ "$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" $RCLOCAL
- fi
- # If SELinux is enabled and a custom port was selected, we need this
- if hash sestatus 2>/dev/null; then
- if sestatus | grep "Current mode" | grep -qs "enforcing"; then
- if [[ "$PORT" != '1194' ]]; then
- # semanage isn't available in CentOS 6 by default
- if ! hash semanage 2>/dev/null; then
- yum install policycoreutils-python -y
- fi
- 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 $PORT
- fi
- fi
- fi
- fi
- # And finally, restart OpenVPN
- if [[ "$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/Scaleway users
- EXTERNALIP=$(wget -qO- ipv4.icanhazip.com)
- if [[ "$IP" != "$EXTERNALIP" ]]; then
- echo ""
- echo "Looks like your server is behind a NAT!"
- echo ""
- echo "If your server is NATed (e.g. LowEndSpirit, Scaleway, or behind a router),"
- echo "then I need to know the address that can be used to access it from outside."
- echo "If that's not the case, just ignore this and leave the next field blank"
- read -p "External IP or domain name: " -e USEREXTERNALIP
- if [[ "$USEREXTERNALIP" != "" ]]; then
- IP=$USEREXTERNALIP
- fi
- fi
- # client-template.txt is created so we have a template to add further users later
- echo "client" > /etc/openvpn/client-template.txt
- if [[ "$PROTOCOL" = 'UDP' ]]; then
- 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
+ # Enable net.ipv4.ip_forward for the system
+ sed -i '/\/c\net.ipv4.ip_forward=1' $SYSCTL
+ if ! grep -q "\" $SYSCTL; then
+ echo 'net.ipv4.ip_forward=1' >> $SYSCTL
+ fi
+ # Avoid an unneeded reboot
+ echo 1 > /proc/sys/net/ipv4/ip_forward
+ # Set NAT for the VPN subnet
+ iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
+ # Save persitent iptables rules
+ iptables-save > $IPTABLES
+ if pgrep firewalld; then
+ # We don't use --add-service=openvpn because that would only work with
+ # the default port. Using both permanent and not permanent rules to
+ # avoid a firewalld reload.
+ if [[ "$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=$PORT/tcp
+ fi
+ firewall-cmd --zone=trusted --add-source=10.8.0.0/24
+ firewall-cmd --permanent --zone=trusted --add-source=10.8.0.0/24
+ fi
+ if iptables -L -n | grep -qE 'REJECT|DROP'; then
+ # If iptables has at least one REJECT rule, we asume this is needed.
+ # Not the best approach but I can't think of other and this shouldn't
+ # cause problems.
+ if [[ "$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
+ # Save persitent OpenVPN rules
+ iptables-save > $IPTABLES
+ fi
+ # If SELinux is enabled and a custom port was selected, we need this
+ if hash sestatus 2>/dev/null; then
+ if sestatus | grep "Current mode" | grep -qs "enforcing"; then
+ if [[ "$PORT" != '1194' ]]; then
+ # semanage isn't available in CentOS 6 by default
+ if ! hash semanage 2>/dev/null; then
+ yum install policycoreutils-python -y
+ fi
+ 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 $PORT
+ fi
+ fi
+ fi
+ fi
+ # And finally, restart OpenVPN
+ if [[ "$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/Scaleway users
+ EXTERNALIP=$(wget -qO- ipv4.icanhazip.com)
+ if [[ "$IP" != "$EXTERNALIP" ]]; then
+ echo ""
+ echo "Looks like your server is behind a NAT!"
+ echo ""
+ echo "If your server is NATed (e.g. LowEndSpirit, Scaleway, or behind a router),"
+ echo "then I need to know the address that can be used to access it from outside."
+ echo "If that's not the case, just ignore this and leave the next field blank"
+ read -p "External IP or domain name: " -e USEREXTERNALIP
+ if [[ "$USEREXTERNALIP" != "" ]]; then
+ IP=$USEREXTERNALIP
+ fi
+ fi
+ # client-template.txt is created so we have a template to add further users later
+ echo "client" > /etc/openvpn/client-template.txt
+ if [[ "$PROTOCOL" = 'UDP' ]]; then
+ 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 $PORT
dev tun
resolv-retry infinite
nobind
@@ -634,12 +673,695 @@ tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
setenv opt block-outside-dns
verb 3" >> /etc/openvpn/client-template.txt
- # Generate the custom client.ovpn
- newclient "$CLIENT"
- echo ""
- echo "Finished!"
- echo ""
- 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!"
+ # Generate the custom client.ovpn
+ newclient "$CLIENT"
+ echo ""
+ echo "Finished!"
+ echo ""
+ 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;#!/bin/bash
+
+# Secure OpenVPN server installer for Debian, Ubuntu, CentOS and Arch Linux
+# https://github.com/Angristan/OpenVPN-install
+
+
+if [[ "$EUID" -ne 0 ]]; then
+ echo "Sorry, you need to run this as root"
+ exit 1
+fi
+
+if [[ ! -e /dev/net/tun ]]; then
+ echo "TUN is not available"
+ exit 2
+fi
+
+if grep -qs "CentOS release 5" "/etc/redhat-release"; then
+ echo "CentOS 5 is too old and not supported"
+ exit 3
+fi
+
+if [[ -e /etc/debian_version ]]; then
+ OS="debian"
+ # Getting the version number, to verify that a recent version of OpenVPN is available
+ VERSION_ID=$(cat /etc/os-release | grep "VERSION_ID")
+ IPTABLES='/etc/iptables/iptables.rules'
+ SYSCTL='/etc/sysctl.conf'
+ 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
+ echo "Your version of Debian/Ubuntu is not supported."
+ echo "I can't install a recent version of OpenVPN on your system."
+ echo ""
+ echo "However, if you're using Debian unstable/testing, or Ubuntu beta,"
+ echo "then you can continue, a recent version of OpenVPN is available on these."
+ echo "Keep in mind they are not supported, though."
+ while [[ $CONTINUE != "y" && $CONTINUE != "n" ]]; do
+ read -p "Continue ? [y/n]: " -e CONTINUE
+ done
+ if [[ "$CONTINUE" = "n" ]]; then
+ echo "Ok, bye !"
+ exit 4
+ fi
+ fi
+elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
+ OS=centos
+ IPTABLES='/etc/iptables/iptables.rules'
+ SYSCTL='/etc/sysctl.conf'
+elif [[ -e /etc/arch-release ]]; then
+ OS=arch
+ IPTABLES='/etc/iptables/iptables.rules'
+ SYSCTL='/etc/sysctl.d/openvpn.conf'
+else
+ echo "Looks like you aren't running this installer on a Debian, Ubuntu, CentOS or ArchLinux system"
+ exit 4
+fi
+
+newclient () {
+ # Where to write the custom client.ovpn?
+ if [ -e /home/$1 ]; then # if $1 is a user name
+ homeDir="/home/$1"
+ elif [ ${SUDO_USER} ]; then # if not, use SUDO_USER
+ homeDir="/home/${SUDO_USER}"
+ else # if not SUDO_USER, use /root
+ homeDir="/root"
+ fi
+ # Generates the custom client.ovpn
+ cp /etc/openvpn/client-template.txt $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+ cat /etc/openvpn/easy-rsa/pki/ca.crt >> $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+ cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+ cat /etc/openvpn/easy-rsa/pki/private/$1.key >> $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+ echo "key-direction 1" >> $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+ cat /etc/openvpn/tls-auth.key >> $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+}
+
+# Try to get our IP from the system and fallback to the Internet.
+# I do this to make the script compatible with NATed servers (LowEndSpirit/Scaleway)
+# and to avoid getting an IPv6.
+IP=$(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)
+if [[ "$IP" = "" ]]; then
+ IP=$(wget -qO- ipv4.icanhazip.com)
+fi
+# Get Internet network interface with default route
+NIC=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)' | head -1)
+
+if [[ -e /etc/openvpn/server.conf ]]; then
+ while :
+ do
+ clear
+ echo "OpenVPN-install (github.com/Angristan/OpenVPN-install)"
+ echo ""
+ echo "Looks like OpenVPN is already installed"
+ echo ""
+ echo "What do you want to do?"
+ echo " 1) Add a cert for a new user"
+ echo " 2) Revoke existing user cert"
+ echo " 3) Remove OpenVPN"
+ echo " 4) Exit"
+ read -p "Select an option [1-4]: " option
+ case $option in
+ 1)
+ echo ""
+ echo "Tell me a name for the client cert"
+ echo "Please, use one word only, no special characters"
+ read -p "Client name: " -e -i client CLIENT
+ cd /etc/openvpn/easy-rsa/
+ ./easyrsa build-client-full $CLIENT nopass
+ # Generates the custom client.ovpn
+ newclient "$CLIENT"
+ echo ""
+ echo "Client $CLIENT added, certs available at $homeDir/$CLIENT.ovpn"
+ exit
+ ;;
+ 2)
+ NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep -c "^V")
+ if [[ "$NUMBEROFCLIENTS" = '0' ]]; then
+ echo ""
+ echo "You have no existing clients!"
+ exit 5
+ fi
+ echo ""
+ echo "Select the existing client certificate you want to revoke"
+ tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
+ if [[ "$NUMBEROFCLIENTS" = '1' ]]; then
+ read -p "Select one client [1]: " CLIENTNUMBER
+ else
+ read -p "Select one client [1-$NUMBEROFCLIENTS]: " CLIENTNUMBER
+ fi
+ CLIENT=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$CLIENTNUMBER"p)
+ cd /etc/openvpn/easy-rsa/
+ ./easyrsa --batch revoke $CLIENT
+ EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
+ rm -rf pki/reqs/$CLIENT.req
+ rm -rf pki/private/$CLIENT.key
+ rm -rf pki/issued/$CLIENT.crt
+ rm -rf /etc/openvpn/crl.pem
+ cp /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn/crl.pem
+ chmod 644 /etc/openvpn/crl.pem
+ echo ""
+ echo "Certificate for client $CLIENT revoked"
+ echo "Exiting..."
+ exit
+ ;;
+ 3)
+ echo ""
+ read -p "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
+ if [[ "$REMOVE" = 'y' ]]; then
+ PORT=$(grep '^port ' /etc/openvpn/server.conf | cut -d " " -f 2)
+ if pgrep firewalld; then
+ # Using both permanent and not permanent rules to avoid a firewalld reload.
+ firewall-cmd --zone=public --remove-port=$PORT/udp
+ firewall-cmd --zone=trusted --remove-source=10.8.0.0/24
+ firewall-cmd --permanent --zone=public --remove-port=$PORT/udp
+ firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
+ fi
+ if iptables -L -n | grep -qE 'REJECT|DROP'; then
+ if [[ "$PROTOCOL" = 'udp' ]]; then
+ iptables -D INPUT -p udp --dport $PORT -j ACCEPT
+ else
+ iptables -D INPUT -p tcp --dport $PORT -j ACCEPT
+ fi
+ iptables -D FORWARD -s 10.8.0.0/24 -j ACCEPT
+ iptables-save > $IPTABLES
+ fi
+ iptables -t nat -D POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
+ iptables-save > $IPTABLES
+ if hash sestatus 2>/dev/null; then
+ if sestatus | grep "Current mode" | grep -qs "enforcing"; then
+ if [[ "$PORT" != '1194' ]]; then
+ semanage port -d -t openvpn_port_t -p udp $PORT
+ fi
+ fi
+ fi
+ if [[ "$OS" = 'debian' ]]; then
+ apt-get autoremove --purge -y openvpn
+ elif [[ "$OS" = 'arch' ]]; then
+ pacman -R openvpn --noconfirm
+ else
+ yum remove openvpn -y
+ fi
+ rm -rf /etc/openvpn
+ rm -rf /usr/share/doc/openvpn*
+ echo ""
+ echo "OpenVPN removed!"
+ else
+ echo ""
+ echo "Removal aborted!"
+ fi
+ exit
+ ;;
+ 4) exit;;
+ esac
+ done
+else
+ clear
+ echo "Welcome to the secure OpenVPN installer (github.com/Angristan/OpenVPN-install)"
+ echo ""
+ # OpenVPN setup and first user creation
+ echo "I need to ask you a few questions before starting the setup"
+ echo "You can leave the default options and just press enter if you are ok with them"
+ echo ""
+ echo "I need to know the IPv4 address of the network interface you want OpenVPN listening to."
+ echo "If your server is running behind a NAT, (e.g. LowEndSpirit, Scaleway) leave the IP address as it is. (local/private IP)"
+ echo "Otherwise, it should be your public IPv4 address."
+ read -p "IP address: " -e -i $IP IP
+ echo ""
+ echo "What port do you want for OpenVPN?"
+ read -p "Port: " -e -i 1194 PORT
+ echo ""
+ echo "What protocol do you want for OpenVPN?"
+ echo "Unless UDP is blocked, you should not use TCP (unnecessarily slower)"
+ while [[ $PROTOCOL != "UDP" && $PROTOCOL != "TCP" ]]; do
+ read -p "Protocol [UDP/TCP]: " -e -i UDP PROTOCOL
+ done
+ echo ""
+ echo "What DNS do you want to use with the VPN?"
+ echo " 1) Current system resolvers (in /etc/resolv.conf)"
+ echo " 2) FDN (France)"
+ echo " 3) DNS.WATCH (Germany)"
+ echo " 4) OpenDNS (Anycast: worldwide)"
+ echo " 5) Google (Anycast: worldwide)"
+ echo " 6) Yandex Basic (Russia)"
+ echo " 7) AdGuard DNS (Russia)"
+ while [[ $DNS != "1" && $DNS != "2" && $DNS != "3" && $DNS != "4" && $DNS != "5" && $DNS != "6" && $DNS != "7" ]]; do
+ read -p "DNS [1-7]: " -e -i 1 DNS
+ done
+ echo ""
+ echo "See https://github.com/Angristan/OpenVPN-install#encryption to learn more about "
+ echo "the encryption in OpenVPN and the choices I made in this script."
+ echo "Please note that all the choices proposed are secure (to a different degree)"
+ echo "and are still viable to date, unlike some default OpenVPN options"
+ echo ''
+ echo "Choose which cipher you want to use for the data channel:"
+ echo " 1) AES-128-CBC (fastest and sufficiently secure for everyone, recommended)"
+ echo " 2) AES-192-CBC"
+ echo " 3) AES-256-CBC"
+ echo "Alternatives to AES, use them only if you know what you're doing."
+ echo "They are relatively slower but as secure as AES."
+ echo " 4) CAMELLIA-128-CBC"
+ echo " 5) CAMELLIA-192-CBC"
+ echo " 6) CAMELLIA-256-CBC"
+ echo " 7) SEED-CBC"
+ while [[ $CIPHER != "1" && $CIPHER != "2" && $CIPHER != "3" && $CIPHER != "4" && $CIPHER != "5" && $CIPHER != "6" && $CIPHER != "7" ]]; do
+ read -p "Cipher [1-7]: " -e -i 1 CIPHER
+ done
+ case $CIPHER in
+ 1)
+ CIPHER="cipher AES-128-CBC"
+ ;;
+ 2)
+ CIPHER="cipher AES-192-CBC"
+ ;;
+ 3)
+ CIPHER="cipher AES-256-CBC"
+ ;;
+ 4)
+ CIPHER="cipher CAMELLIA-128-CBC"
+ ;;
+ 5)
+ CIPHER="cipher CAMELLIA-192-CBC"
+ ;;
+ 6)
+ CIPHER="cipher CAMELLIA-256-CBC"
+ ;;
+ 7)
+ CIPHER="cipher SEED-CBC"
+ ;;
+ esac
+ echo ""
+ echo "Choose what size of Diffie-Hellman key you want to use:"
+ echo " 1) 2048 bits (fastest)"
+ echo " 2) 3072 bits (recommended, best compromise)"
+ echo " 3) 4096 bits (most secure)"
+ while [[ $DH_KEY_SIZE != "1" && $DH_KEY_SIZE != "2" && $DH_KEY_SIZE != "3" ]]; do
+ read -p "DH key size [1-3]: " -e -i 2 DH_KEY_SIZE
+ done
+ case $DH_KEY_SIZE in
+ 1)
+ DH_KEY_SIZE="2048"
+ ;;
+ 2)
+ DH_KEY_SIZE="3072"
+ ;;
+ 3)
+ DH_KEY_SIZE="4096"
+ ;;
+ esac
+ echo ""
+ echo "Choose what size of RSA key you want to use:"
+ echo " 1) 2048 bits (fastest)"
+ echo " 2) 3072 bits (recommended, best compromise)"
+ echo " 3) 4096 bits (most secure)"
+ while [[ $RSA_KEY_SIZE != "1" && $RSA_KEY_SIZE != "2" && $RSA_KEY_SIZE != "3" ]]; do
+ read -p "RSA key size [1-3]: " -e -i 2 RSA_KEY_SIZE
+ done
+ case $RSA_KEY_SIZE in
+ 1)
+ RSA_KEY_SIZE="2048"
+ ;;
+ 2)
+ RSA_KEY_SIZE="3072"
+ ;;
+ 3)
+ RSA_KEY_SIZE="4096"
+ ;;
+ esac
+ echo ""
+ 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 [[ "$VERSION_ID" = 'VERSION_ID="7"' ]]; then
+ echo "deb http://build.openvpn.net/debian/openvpn/stable wheezy main" > /etc/apt/sources.list.d/openvpn.list
+ wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
+ apt-get update
+ fi
+ # Debian 8
+ if [[ "$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
+ # Install iptables service
+ if [[ ! -e /etc/systemd/system/iptables.service ]]; then
+ mkdir /etc/iptables
+ iptables-save > /etc/iptables/iptables.rules
+ echo "#!/bin/sh
+iptables -F
+iptables -X
+iptables -t nat -F
+iptables -t nat -X
+iptables -t mangle -F
+iptables -t mangle -X
+iptables -P INPUT ACCEPT
+iptables -P FORWARD ACCEPT
+iptables -P OUTPUT ACCEPT" > /etc/iptables/flush-iptables.sh
+ chmod +x /etc/iptables/flush-iptables.sh
+ echo "[Unit]
+Description=Packet Filtering Framework
+DefaultDependencies=no
+Before=network-pre.target
+Wants=network-pre.target
+[Service]
+Type=oneshot
+ExecStart=/sbin/iptables-restore /etc/iptables/iptables.rules
+ExecReload=/sbin/iptables-restore /etc/iptables/iptables.rules
+ExecStop=/etc/iptables/flush-iptables.sh
+RemainAfterExit=yes
+[Install]
+WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
+ systemctl daemon-reload
+ systemctl enable iptables.service
+ fi
+ elif [[ "$OS" = 'centos' ]]; then
+ yum install epel-release -y
+ yum install openvpn iptables openssl wget ca-certificates curl -y
+ # Install iptables service
+ if [[ ! -e /etc/systemd/system/iptables.service ]]; then
+ mkdir /etc/iptables
+ iptables-save > /etc/iptables/iptables.rules
+ echo "#!/bin/sh
+iptables -F
+iptables -X
+iptables -t nat -F
+iptables -t nat -X
+iptables -t mangle -F
+iptables -t mangle -X
+iptables -P INPUT ACCEPT
+iptables -P FORWARD ACCEPT
+iptables -P OUTPUT ACCEPT" > /etc/iptables/flush-iptables.sh
+ chmod +x /etc/iptables/flush-iptables.sh
+ echo "[Unit]
+Description=Packet Filtering Framework
+DefaultDependencies=no
+Before=network-pre.target
+Wants=network-pre.target
+[Service]
+Type=oneshot
+ExecStart=/sbin/iptables-restore /etc/iptables/iptables.rules
+ExecReload=/sbin/iptables-restore /etc/iptables/iptables.rules
+ExecStop=/etc/iptables/flush-iptables.sh
+RemainAfterExit=yes
+[Install]
+WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
+ systemctl daemon-reload
+ systemctl enable iptables.service
+ # Disable firewalld to allow iptables to start upon reboot
+ systemctl disable firewalld
+ fi
+ 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 dependencies
+ pacman -Syu openvpn iptables openssl wget ca-certificates curl --needed --noconfirm
+ iptables-save > /etc/iptables/iptables.rules # iptables won't start if this file does not exist
+ systemctl daemon-reload
+ 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-3.0.3.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-3.0.3.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
+ openssl dhparam -out dh.pem $DH_KEY_SIZE
+ ./easyrsa build-server-full server nopass
+ ./easyrsa build-client-full $CLIENT nopass
+ EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
+ # 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 $PORT" > /etc/openvpn/server.conf
+ if [[ "$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
+ # DNS resolvers
+ case $DNS in
+ 1)
+ # Obtain the resolvers from resolv.conf and use them for OpenVPN
+ 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
+ echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server.conf
+ done
+ ;;
+ 2) #FDN
+ echo 'push "dhcp-option DNS 80.67.169.12"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 80.67.169.40"' >> /etc/openvpn/server.conf
+ ;;
+ 3) #DNS.WATCH
+ echo 'push "dhcp-option DNS 84.200.69.80"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 84.200.70.40"' >> /etc/openvpn/server.conf
+ ;;
+ 4) #OpenDNS
+ echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server.conf
+ ;;
+ 5) #Google
+ echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server.conf
+ ;;
+ 6) #Yandex Basic
+ echo 'push "dhcp-option DNS 77.88.8.8"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 77.88.8.1"' >> /etc/openvpn/server.conf
+ ;;
+ 7) #AdGuard DNS
+ echo 'push "dhcp-option DNS 176.103.130.130"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 176.103.130.131"' >> /etc/openvpn/server.conf
+ ;;
+ esac
+echo 'push "redirect-gateway def1 bypass-dhcp" '>> /etc/openvpn/server.conf
+echo "crl-verify crl.pem
+ca ca.crt
+cert server.crt
+key server.key
+tls-auth tls-auth.key 0
+dh dh.pem
+auth SHA256
+$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 '/\/c\net.ipv4.ip_forward=1' $SYSCTL
+ if ! grep -q "\" $SYSCTL; then
+ echo 'net.ipv4.ip_forward=1' >> $SYSCTL
+ fi
+ # Avoid an unneeded reboot
+ echo 1 > /proc/sys/net/ipv4/ip_forward
+ # Set NAT for the VPN subnet
+ iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
+ # Save persitent iptables rules
+ iptables-save > $IPTABLES
+ if pgrep firewalld; then
+ # We don't use --add-service=openvpn because that would only work with
+ # the default port. Using both permanent and not permanent rules to
+ # avoid a firewalld reload.
+ if [[ "$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=$PORT/tcp
+ fi
+ firewall-cmd --zone=trusted --add-source=10.8.0.0/24
+ firewall-cmd --permanent --zone=trusted --add-source=10.8.0.0/24
+ fi
+ if iptables -L -n | grep -qE 'REJECT|DROP'; then
+ # If iptables has at least one REJECT rule, we asume this is needed.
+ # Not the best approach but I can't think of other and this shouldn't
+ # cause problems.
+ if [[ "$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
+ # Save persitent OpenVPN rules
+ iptables-save > $IPTABLES
+ fi
+ # If SELinux is enabled and a custom port was selected, we need this
+ if hash sestatus 2>/dev/null; then
+ if sestatus | grep "Current mode" | grep -qs "enforcing"; then
+ if [[ "$PORT" != '1194' ]]; then
+ # semanage isn't available in CentOS 6 by default
+ if ! hash semanage 2>/dev/null; then
+ yum install policycoreutils-python -y
+ fi
+ 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 $PORT
+ fi
+ fi
+ fi
+ fi
+ # And finally, restart OpenVPN
+ if [[ "$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/Scaleway users
+ EXTERNALIP=$(wget -qO- ipv4.icanhazip.com)
+ if [[ "$IP" != "$EXTERNALIP" ]]; then
+ echo ""
+ echo "Looks like your server is behind a NAT!"
+ echo ""
+ echo "If your server is NATed (e.g. LowEndSpirit, Scaleway, or behind a router),"
+ echo "then I need to know the address that can be used to access it from outside."
+ echo "If that's not the case, just ignore this and leave the next field blank"
+ read -p "External IP or domain name: " -e USEREXTERNALIP
+ if [[ "$USEREXTERNALIP" != "" ]]; then
+ IP=$USEREXTERNALIP
+ fi
+ fi
+ # client-template.txt is created so we have a template to add further users later
+ echo "client" > /etc/openvpn/client-template.txt
+ if [[ "$PROTOCOL" = 'UDP' ]]; then
+ 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 $PORT
+dev tun
+resolv-retry infinite
+nobind
+persist-key
+persist-tun
+remote-cert-tls server
+auth SHA256
+auth-nocache
+$CIPHER
+tls-client
+tls-version-min 1.2
+tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
+setenv opt block-outside-dns
+verb 3" >> /etc/openvpn/client-template.txt
+
+ # Generate the custom client.ovpn
+ newclient "$CLIENT"
+ echo ""
+ echo "Finished!"
+ echo ""
+ 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;