diff --git a/openvpn-install.sh b/openvpn-install.sh
index f7ec2dc..7e7b886 100755
--- a/openvpn-install.sh
+++ b/openvpn-install.sh
@@ -1,88 +1,114 @@
#!/bin/bash
-# OpenVPN road warrior installer for Debian, Ubuntu and CentOS
-# This script will work on Debian, Ubuntu, CentOS and probably other distros
-# of the same families, although no support is offered for them. It isn't
-# bulletproof but it will probably work if you simply want to setup a VPN on
-# your Debian/Ubuntu/CentOS box. It has been designed to be as unobtrusive and
-# universal as possible.
+# Secure OpenVPN server installer for Debian, Ubuntu, CentOS and Arch Linux
+# https://github.com/Angristan/OpenVPN-install
-# Detect Debian users running the script with "sh" instead of bash
-if readlink /proc/$$/exe | grep -qs "dash"; then
- echo "This script needs to be run with bash, not sh"
- exit 1
-fi
-
if [[ "$EUID" -ne 0 ]]; then
echo "Sorry, you need to run this as root"
- exit 2
+ exit 1
fi
if [[ ! -e /dev/net/tun ]]; then
- echo "The TUN device is not available
-You need to enable TUN before running this script"
- exit 3
+ echo "TUN is not available"
+ exit 2
fi
if grep -qs "CentOS release 5" "/etc/redhat-release"; then
echo "CentOS 5 is too old and not supported"
- exit 4
+ exit 3
fi
+
if [[ -e /etc/debian_version ]]; then
- OS=debian
- GROUPNAME=nogroup
+ OS="debian"
+ # Getting the version number, to verify that a recent version of OpenVPN is available
+ VERSION_ID=$(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
elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
OS=centos
- GROUPNAME=nobody
RCLOCAL='/etc/rc.d/rc.local'
+ SYSCTL='/etc/sysctl.conf'
+ # Needed for CentOS 7
+ chmod +x /etc/rc.d/rc.local
+elif [[ -e /etc/arch-release ]]; then
+ OS=arch
+ RCLOCAL='/etc/rc.local'
+ SYSCTL='/etc/sysctl.d/openvpn.conf'
else
- echo "Looks like you aren't running this installer on Debian, Ubuntu or CentOS"
- exit 5
+ 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-common.txt ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- cat /etc/openvpn/easy-rsa/pki/ca.crt >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- cat /etc/openvpn/easy-rsa/pki/private/$1.key >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- cat /etc/openvpn/ta.key >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
+ 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/$1.ovpn
}
# Try to get our IP from the system and fallback to the Internet.
-# I do this to make the script compatible with NATed servers (lowendspirit.com)
+# I do this to make the script compatible with NATed servers (LowEndSpirit/Scaleway)
# and to avoid getting an IPv6.
IP=$(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 -4qO- "http://whatismyip.akamai.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+)')
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 new user"
- echo " 2) Revoke an existing user"
+ 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 $option in
- 1)
+ 1)
echo ""
- echo "Tell me a name for the client certificate"
+ echo "Tell me a name for the client cert"
echo "Please, use one word only, no special characters"
read -p "Client name: " -e -i client CLIENT
cd /etc/openvpn/easy-rsa/
@@ -90,17 +116,15 @@ if [[ -e /etc/openvpn/server.conf ]]; then
# Generates the custom client.ovpn
newclient "$CLIENT"
echo ""
- echo "Client $CLIENT added, configuration is available at" ~/"$CLIENT.ovpn"
+ echo "Client $CLIENT added, certs available at $homeDir/$CLIENT.ovpn"
exit
;;
2)
- # This option could be documented a bit better and maybe even be simplimplified
- # ...but what can I say, I want some sleep too
NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep -c "^V")
if [[ "$NUMBEROFCLIENTS" = '0' ]]; then
echo ""
echo "You have no existing clients!"
- exit 6
+ exit 5
fi
echo ""
echo "Select the existing client certificate you want to revoke"
@@ -119,53 +143,46 @@ if [[ -e /etc/openvpn/server.conf ]]; then
rm -rf pki/issued/$CLIENT.crt
rm -rf /etc/openvpn/crl.pem
cp /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn/crl.pem
- # CRL is read with each client connection, when OpenVPN is dropped to nobody
- chown nobody:$GROUPNAME /etc/openvpn/crl.pem
+ chmod 644 /etc/openvpn/crl.pem
echo ""
echo "Certificate for client $CLIENT revoked"
+ echo "Exiting..."
exit
;;
- 3)
+ 3)
echo ""
read -p "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
if [[ "$REMOVE" = 'y' ]]; then
PORT=$(grep '^port ' /etc/openvpn/server.conf | cut -d " " -f 2)
- PROTOCOL=$(grep '^proto ' /etc/openvpn/server.conf | cut -d " " -f 2)
if pgrep firewalld; then
- IP=$(firewall-cmd --direct --get-rules ipv4 nat POSTROUTING | grep '\-s 10.8.0.0/24 '"'"'!'"'"' -d 10.8.0.0/24 -j SNAT --to ' | cut -d " " -f 10)
# Using both permanent and not permanent rules to avoid a firewalld reload.
- firewall-cmd --zone=public --remove-port=$PORT/$PROTOCOL
+ firewall-cmd --zone=public --remove-port=$PORT/udp
firewall-cmd --zone=trusted --remove-source=10.8.0.0/24
- firewall-cmd --permanent --zone=public --remove-port=$PORT/$PROTOCOL
+ firewall-cmd --permanent --zone=public --remove-port=$PORT/udp
firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
- firewall-cmd --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
- firewall-cmd --permanent --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
- else
- IP=$(grep 'iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to ' $RCLOCAL | cut -d " " -f 14)
- iptables -t nat -D POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
- sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 ! -d 10.8.0.0\/24 -j SNAT --to /d' $RCLOCAL
- if iptables -L -n | grep -qE '^ACCEPT'; then
- iptables -D INPUT -p $PROTOCOL --dport $PORT -j ACCEPT
- iptables -D FORWARD -s 10.8.0.0/24 -j ACCEPT
- iptables -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
- sed -i "/iptables -I INPUT -p $PROTOCOL --dport $PORT -j ACCEPT/d" $RCLOCAL
- sed -i "/iptables -I FORWARD -s 10.8.0.0\/24 -j ACCEPT/d" $RCLOCAL
- sed -i "/iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT/d" $RCLOCAL
- fi
fi
+ if 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' || "$PROTOCOL" = 'tcp' ]]; then
- semanage port -d -t openvpn_port_t -p $PROTOCOL $PORT
+ if [[ "$PORT" != '1194' ]]; then
+ semanage port -d -t openvpn_port_t -p udp $PORT
fi
fi
fi
if [[ "$OS" = 'debian' ]]; then
- apt-get remove --purge -y openvpn
+ 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
@@ -179,184 +196,364 @@ if [[ -e /etc/openvpn/server.conf ]]; then
done
else
clear
- echo 'Welcome to this quick OpenVPN "road warrior" installer'
+ 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 "First I need to know the IPv4 address of the network interface you want OpenVPN"
- echo "listening to."
+ 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 "Which protocol do you want for OpenVPN connections?"
- echo " 1) UDP (recommended)"
- echo " 2) TCP"
- read -p "Protocol [1-2]: " -e -i 1 PROTOCOL
- case $PROTOCOL in
- 1)
- PROTOCOL=udp
+ 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)"
+ while [[ $DNS != "1" && $DNS != "2" && $DNS != "3" && $DNS != "4" && $DNS != "5" && $DNS != "6" ]]; do
+ read -p "DNS [1-6]: " -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)
- PROTOCOL=tcp
+ 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 "What port do you want OpenVPN listening to?"
- read -p "Port: " -e -i 1194 PORT
+ 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 "Which DNS do you want to use with the VPN?"
- echo " 1) Current system resolvers"
- echo " 2) Google"
- echo " 3) OpenDNS"
- echo " 4) NTT"
- echo " 5) Hurricane Electric"
- echo " 6) Verisign"
- read -p "DNS [1-6]: " -e -i 1 DNS
+ 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 "DH 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 your name for the client certificate"
- echo "Please, use one word only, no special characters"
- read -p "Client name: " -e -i client CLIENT
+ 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 update
- apt-get install openvpn iptables openssl ca-certificates -y
- else
- # Else, the distro is CentOS
+ 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 -y
+ yum install openvpn iptables openssl wget ca-certificates curl -y
+ else
+ # Else, the distro is ArchLinux
+ echo ""
+ echo ""
+ echo "As you're using ArchLinux, I need to update the packages on your system to install those I need."
+ echo "Not doing that could cause problems between dependencies, or missing files in repositories."
+ echo ""
+ echo "Continuing will update your installed packages and install needed ones."
+ while [[ $CONTINUE != "y" && $CONTINUE != "n" ]]; do
+ read -p "Continue ? [y/n]: " -e -i y CONTINUE
+ done
+ if [[ "$CONTINUE" = "n" ]]; then
+ echo "Ok, bye !"
+ exit 4
+ fi
+
+ if [[ "$OS" = 'arch' ]]; then
+ # Install rc.local
+ echo "[Unit]
+Description=/etc/rc.local compatibility
+
+[Service]
+Type=oneshot
+ExecStart=/etc/rc.local
+RemainAfterExit=yes
+
+[Install]
+WantedBy=multi-user.target" > /etc/systemd/system/rc-local.service
+ chmod +x /etc/rc.local
+ systemctl enable rc-local.service
+ if ! grep '#!' $RCLOCAL; then
+ echo "#!/bin/bash" > $RCLOCAL
+ fi
+ fi
+
+ # Install dependencies
+ pacman -Syu openvpn iptables openssl wget ca-certificates curl --needed --noconfirm
+ if [[ "$OS" = 'arch' ]]; then
+ touch /etc/iptables/iptables.rules # iptables won't start if this file does not exist
+ systemctl enable iptables
+ systemctl start iptables
+ fi
fi
+ # Find out if the machine uses nogroup or nobody for the permissionless group
+ if grep -qs "^nogroup:" /etc/group; then
+ NOGROUP=nogroup
+ else
+ NOGROUP=nobody
+ fi
+
# An old version of easy-rsa was available by default in some openvpn packages
if [[ -d /etc/openvpn/easy-rsa/ ]]; then
rm -rf /etc/openvpn/easy-rsa/
fi
# Get easy-rsa
- wget -O ~/EasyRSA-3.0.1.tgz "https://github.com/OpenVPN/easy-rsa/releases/download/3.0.1/EasyRSA-3.0.1.tgz"
- tar xzf ~/EasyRSA-3.0.1.tgz -C ~/
- mv ~/EasyRSA-3.0.1/ /etc/openvpn/
- mv /etc/openvpn/EasyRSA-3.0.1/ /etc/openvpn/easy-rsa/
+ wget -O ~/EasyRSA-3.0.3.tgz https://github.com/OpenVPN/easy-rsa/releases/download/v3.0.3/EasyRSA-3.0.3.tgz
+ tar xzf ~/EasyRSA-3.0.3.tgz -C ~/
+ mv ~/EasyRSA-3.0.3/ /etc/openvpn/
+ mv /etc/openvpn/EasyRSA-3.0.3/ /etc/openvpn/easy-rsa/
chown -R root:root /etc/openvpn/easy-rsa/
- rm -rf ~/EasyRSA-3.0.1.tgz
+ rm -rf ~/EasyRSA-3.0.3.tgz
cd /etc/openvpn/easy-rsa/
+ echo "set_var EASYRSA_KEY_SIZE $RSA_KEY_SIZE" > vars
# Create the PKI, set up the CA, the DH params and the server + client certificates
./easyrsa init-pki
./easyrsa --batch build-ca nopass
- ./easyrsa gen-dh
+ openssl dhparam -out dh.pem $DH_KEY_SIZE
./easyrsa build-server-full server nopass
./easyrsa build-client-full $CLIENT nopass
./easyrsa gen-crl
- # Move the stuff we need
- cp pki/ca.crt pki/private/ca.key pki/dh.pem pki/issued/server.crt pki/private/server.key pki/crl.pem /etc/openvpn
- # CRL is read with each client connection, when OpenVPN is dropped to nobody
- chown nobody:$GROUPNAME /etc/openvpn/crl.pem
- # Generate key for tls-auth
- openvpn --genkey --secret /etc/openvpn/ta.key
+ # generate tls-auth key
+ openvpn --genkey --secret /etc/openvpn/tls-auth.key
+ # Move all the generated files
+ cp pki/ca.crt pki/private/ca.key dh.pem pki/issued/server.crt pki/private/server.key /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn
+ # Make cert revocation list readable for non-root
+ chmod 644 /etc/openvpn/crl.pem
+
# Generate server.conf
- echo "port $PORT
-proto $PROTOCOL
-dev tun
-sndbuf 0
-rcvbuf 0
-ca ca.crt
-cert server.crt
-key server.key
-dh dh.pem
-auth SHA512
-tls-auth ta.key 0
+ echo "local $IP" > /etc/openvpn/server.conf
+ echo "port $PORT" >> /etc/openvpn/server.conf
+ if [[ "$PROTOCOL" = 'UDP' ]]; then
+ echo "proto udp" >> /etc/openvpn/server.conf
+ elif [[ "$PROTOCOL" = 'TCP' ]]; then
+ echo "proto tcp" >> /etc/openvpn/server.conf
+ fi
+ echo "dev tun
+user nobody
+group $NOGROUP
+persist-key
+persist-tun
+keepalive 10 120
topology subnet
server 10.8.0.0 255.255.255.0
-ifconfig-pool-persist ipp.txt" > /etc/openvpn/server.conf
- echo 'push "redirect-gateway def1 bypass-dhcp"' >> /etc/openvpn/server.conf
- # DNS
+ifconfig-pool-persist ipp.txt" >> /etc/openvpn/server.conf
+ # DNS resolvers
case $DNS in
- 1)
+ 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)
- echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server.conf
- echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server.conf
+ 2) #FDN
+ echo 'push "dhcp-option DNS 80.67.169.12"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 80.67.169.40"' >> /etc/openvpn/server.conf
;;
- 3)
+ 3) #DNS.WATCH
+ echo 'push "dhcp-option DNS 84.200.69.80"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 84.200.70.40"' >> /etc/openvpn/server.conf
+ ;;
+ 4) #OpenDNS
echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server.conf
echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server.conf
;;
- 4)
- echo 'push "dhcp-option DNS 129.250.35.250"' >> /etc/openvpn/server.conf
- echo 'push "dhcp-option DNS 129.250.35.251"' >> /etc/openvpn/server.conf
+ 5) #Google
+ echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server.conf
;;
- 5)
- echo 'push "dhcp-option DNS 74.82.42.42"' >> /etc/openvpn/server.conf
- ;;
- 6)
- echo 'push "dhcp-option DNS 64.6.64.6"' >> /etc/openvpn/server.conf
- echo 'push "dhcp-option DNS 64.6.65.6"' >> /etc/openvpn/server.conf
+ 6) #Yandex Basic
+ echo 'push "dhcp-option DNS 77.88.8.8"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 77.88.8.1"' >> /etc/openvpn/server.conf
;;
esac
- echo "keepalive 10 120
-cipher AES-256-CBC
-comp-lzo
-user nobody
-group $GROUPNAME
-persist-key
-persist-tun
-status openvpn-status.log
-verb 3
-crl-verify crl.pem" >> /etc/openvpn/server.conf
+echo 'push "redirect-gateway def1 bypass-dhcp" '>> /etc/openvpn/server.conf
+echo "crl-verify crl.pem
+ca ca.crt
+cert server.crt
+key server.key
+tls-auth tls-auth.key 0
+dh dh.pem
+auth SHA256
+$CIPHER
+tls-server
+tls-version-min 1.2
+tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
+status openvpn.log
+verb 3" >> /etc/openvpn/server.conf
+
+ # Create the sysctl configuration file if needed (mainly for Arch Linux)
+ if [[ ! -e $SYSCTL ]]; then
+ touch $SYSCTL
+ fi
+
# Enable net.ipv4.ip_forward for the system
- sed -i '/\/c\net.ipv4.ip_forward=1' /etc/sysctl.conf
- if ! grep -q "\" /etc/sysctl.conf; then
- echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf
+ sed -i '/\/c\net.ipv4.ip_forward=1' $SYSCTL
+ if ! grep -q "\" $SYSCTL; then
+ echo 'net.ipv4.ip_forward=1' >> $SYSCTL
fi
# Avoid an unneeded reboot
echo 1 > /proc/sys/net/ipv4/ip_forward
- if pgrep firewalld; then
- # Using both permanent and not permanent rules to avoid a firewalld
- # reload.
- # We don't use --add-service=openvpn because that would only work with
- # the default port and protocol.
- firewall-cmd --zone=public --add-port=$PORT/$PROTOCOL
- firewall-cmd --zone=trusted --add-source=10.8.0.0/24
- firewall-cmd --permanent --zone=public --add-port=$PORT/$PROTOCOL
- firewall-cmd --permanent --zone=trusted --add-source=10.8.0.0/24
- # Set NAT for the VPN subnet
- firewall-cmd --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
- firewall-cmd --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
- else
- # Needed to use rc.local with some systemd distros
- if [[ "$OS" = 'debian' && ! -e $RCLOCAL ]]; then
- echo '#!/bin/sh -e
-exit 0' > $RCLOCAL
- fi
- chmod +x $RCLOCAL
- # Set NAT for the VPN subnet
- iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
- sed -i "1 a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP" $RCLOCAL
- if iptables -L -n | grep -qE '^(REJECT|DROP)'; then
- # If iptables has at least one REJECT rule, we asume this is needed.
- # Not the best approach but I can't think of other and this shouldn't
- # cause problems.
- iptables -I INPUT -p $PROTOCOL --dport $PORT -j ACCEPT
- iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
- iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
- sed -i "1 a\iptables -I INPUT -p $PROTOCOL --dport $PORT -j ACCEPT" $RCLOCAL
- sed -i "1 a\iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT" $RCLOCAL
- sed -i "1 a\iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" $RCLOCAL
- fi
+ # Needed to use rc.local with some systemd distros
+ if [[ "$OS" = 'debian' && ! -e $RCLOCAL ]]; then
+ echo '#!/bin/sh -e
+ exit 0' > $RCLOCAL
fi
- # If SELinux is enabled and a custom port or TCP was selected, we need this
+ 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' || "$PROTOCOL" = 'tcp' ]]; then
+ if [[ "$PORT" != '1194' ]]; then
# semanage isn't available in CentOS 6 by default
if ! hash semanage 2>/dev/null; then
yum install policycoreutils-python -y
fi
- semanage port -a -t openvpn_port_t -p $PROTOCOL $PORT
+ if [[ "$PROTOCOL" = 'UDP' ]]; then
+ semanage port -a -t openvpn_port_t -p udp $PORT
+ elif [[ "$PROTOCOL" = 'TCP' ]]; then
+ semanage port -a -t openvpn_port_t -p tcp $PORT
+ fi
fi
fi
fi
@@ -364,55 +561,85 @@ exit 0' > $RCLOCAL
if [[ "$OS" = 'debian' ]]; then
# Little hack to check for systemd
if pgrep systemd-journal; then
- systemctl restart openvpn@server.service
+ if [[ "$VERSION_ID" = 'VERSION_ID="9"' ]]; then
+ #Workaround to fix OpenVPN service on Debian 9 OpenVZ
+ sed -i 's|LimitNPROC|#LimitNPROC|' /lib/systemd/system/openvpn-server\@.service
+ sed -i 's|/etc/openvpn/server|/etc/openvpn|' /lib/systemd/system/openvpn-server\@.service
+ sed -i 's|%i.conf|server.conf|' /lib/systemd/system/openvpn-server\@.service
+ systemctl daemon-reload
+ systemctl restart openvpn-server@openvpn.service
+ systemctl enable openvpn-server@openvpn.service
+ else
+ systemctl restart openvpn@server.service
+ fi
else
/etc/init.d/openvpn restart
fi
else
if pgrep systemd-journal; then
- systemctl restart openvpn@server.service
- systemctl enable openvpn@server.service
+ if [[ "$OS" = 'arch' ]]; then
+ #Workaround to avoid rewriting the entire script for Arch
+ sed -i 's|/etc/openvpn/server|/etc/openvpn|' /usr/lib/systemd/system/openvpn-server@.service
+ sed -i 's|%i.conf|server.conf|' /usr/lib/systemd/system/openvpn-server@.service
+ systemctl daemon-reload
+ systemctl restart openvpn-server@openvpn.service
+ systemctl enable openvpn-server@openvpn.service
+ else
+ systemctl restart openvpn@server.service
+ systemctl enable openvpn@server.service
+ fi
else
service openvpn restart
chkconfig openvpn on
fi
fi
- # Try to detect a NATed connection and ask about it to potential LowEndSpirit users
- EXTERNALIP=$(wget -4qO- "http://whatismyip.akamai.com/")
+ # Try to detect a NATed connection and ask about it to potential LowEndSpirit/Scaleway users
+ EXTERNALIP=$(wget -qO- ipv4.icanhazip.com)
if [[ "$IP" != "$EXTERNALIP" ]]; then
echo ""
echo "Looks like your server is behind a NAT!"
echo ""
- echo "If your server is NATed (e.g. LowEndSpirit), I need to know the external IP"
- echo "If that's not the case, just ignore this and leave the next field blank"
- read -p "External IP: " -e USEREXTERNALIP
+ 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-common.txt is created so we have a template to add further users later
- echo "client
+ # client-template.txt is created so we have a template to add further users later
+ echo "client" > /etc/openvpn/client-template.txt
+ if [[ "$PROTOCOL" = 'UDP' ]]; then
+ echo "proto udp" >> /etc/openvpn/client-template.txt
+ elif [[ "$PROTOCOL" = 'TCP' ]]; then
+ echo "proto tcp-client" >> /etc/openvpn/client-template.txt
+ fi
+ echo "remote $IP $PORT
dev tun
-proto $PROTOCOL
-sndbuf 0
-rcvbuf 0
-remote $IP $PORT
resolv-retry infinite
nobind
persist-key
persist-tun
remote-cert-tls server
-auth SHA512
-cipher AES-256-CBC
-comp-lzo
+auth SHA256
+$CIPHER
+tls-client
+tls-version-min 1.2
+tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
setenv opt block-outside-dns
-key-direction 1
-verb 3" > /etc/openvpn/client-common.txt
- # Generates the custom client.ovpn
+verb 3" >> /etc/openvpn/client-template.txt
+
+ # Generate the custom client.ovpn
newclient "$CLIENT"
echo ""
echo "Finished!"
echo ""
- echo "Your client configuration is available at" ~/"$CLIENT.ovpn"
- echo "If you want to add more clients, you simply need to run this script again!"
-fi
\ No newline at end of file
+ echo "Your client config is available at $homeDir/$CLIENT.ovpn"
+ echo "If you want to add more clients, you simply need to run this script another time!"
+fi
+exit 0;
+
+# routing
+iptables -t nat -F POSTROUTING
+echo 1 > /proc/sys/net/ipv4/ip_forward
+iptables -t nat -A POSTROUTING -o eth0 -s 10.8.0.0/24 -j MASQUERADE