Bernhard.Linz/openvpn-install
1
0
Fork 0
mirror of https://github.com/angristan/openvpn-install.git synced 2025-07-01 12:04:22 +02:00
Code Issues Projects Releases Wiki Activity
openvpn-install/openvpn-install.sh
Angristan ff10bd83e6 Disable cipher negotiation for 2.4 clients 
This seems like a little change but it was not easy to find.

I want this script to support only OpenVPN 2.4 servers, but also 2.4 and 2.3 clients.

The thing is, the OpenVPN 2.3 client doesn't care at all what cipher the server wants to use. The cipher parameter in the client config is the king here.

But with OpenVPN 2.4, you can specify whatever cipher you want, the clients and the server will negotiate the best cipher possible, which is AES-256-GCM right now. The use of --ncp-ciphers cipher_list is useless because a 2.3 client will still use its cipher and a 2.4 client will still use AES-256-GCM.

I won't detail all my experiments here, but in the end, ncp-disable disable the cipher negotiation for 2.4 clients. But it will only work if the cipher in the server config and the client config are the same, and as they are in the script, it's ok. This is not the best solution because that means if you want to support a 2.3 client, you'll be forced to use one and only one AES-CBC cipher, even with your 2.4 clients, even though you could use a different cipher for each client. But as we're still using AES and OpenVPN 2.4 getting more and more deployed, this is not a too big issue in the end. Also adding menus to to choose what kind of client you want etc would make the script pretty complicated, so this is a good compromise here.

TL;DR: ncp-disable enforces a OpenVPN 2.4 client to use the specified cipher in the server and the client config.

See here for me details regarding the data channel cipher negotiation in OpenVPN 2.4 : https://community.openvpn.net/openvpn/wiki/Openvpn24ManPage#lbAJ
2017-09-17 12:19:59 +02:00

819 lines
27 KiB
Bash
Raw Blame History

#!/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")
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="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
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 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 "<ca>" >> $homeDir/$1.ovpn
cat /etc/openvpn/easy-rsa/pki/ca.crt >> $homeDir/$1.ovpn
echo "</ca>" >> $homeDir/$1.ovpn
echo "<cert>" >> $homeDir/$1.ovpn
cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> $homeDir/$1.ovpn
echo "</cert>" >> $homeDir/$1.ovpn
echo "<key>" >> $homeDir/$1.ovpn
cat /etc/openvpn/easy-rsa/pki/private/$1.key >> $homeDir/$1.ovpn
echo "</key>" >> $homeDir/$1.ovpn
#We verify if we used tls-crypt or tls-auth during the installation
TLS_SIG=$(cat /etc/openvpn/TLS_SIG)
if [[ $TLS_SIG == "1" ]]; then
echo "<tls-crypt>" >> ~/$1.ovpn
cat /etc/openvpn/tls-crypt.key >> ~/$1.ovpn
echo "</tls-crypt>" >> ~/$1.ovpn
elif [[ $TLS_SIG == "2" ]]; then
echo "key-direction 1" >> $homeDir/$1.ovpn
echo "<tls-auth>" >> $homeDir/$1.ovpn
cat /etc/openvpn/tls-auth.key >> $homeDir/$1.ovpn
echo "</tls-auth>" >> $homeDir/$1.ovpn
fi
}
# Try to get our IP from the system and fallback to the Internet.
# I do this to make the script compatible with NATed servers (LowEndSpirit/Scaleway)
# and to avoid getting an IPv6.
IP=$(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+)')
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 $CLIENT
./easyrsa gen-crl
rm -rf pki/reqs/$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
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)"
echo " 1) UDP (recommended)"
echo " 2) TCP"
while [[ $PROTOCOL != "1" && $PROTOCOL != "2" ]]; do
read -p "Protocol [1-2]: " -e -i 1 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 enough considering today's strandards,"
echo "unlike some default OpenVPN options"
echo ''
echo "Choose which cipher you want to use for the data channel:"
echo ""
echo " 1) AES-128-GCM (recommended)"
echo " 2) AES-192-GCM"
echo " 3) AES-256-GCM"
echo "Only use AES-CBC for OpenVPN 2.3 compatibilty"
echo " 4) AES-128-CBC"
echo " 5) AES-192-CBC"
echo " 6) AES-256-CBC"
while [[ $CIPHER != "1" && $CIPHER != "2" && $CIPHER != "3" && $CIPHER != "4" && $CIPHER != "5" && $CIPHER != "6" ]]; do
read -p "Cipher [1-7]: " -e -i 1 CIPHER
done
case $CIPHER in
1)
CIPHER="cipher AES-128-GCM"
;;
2)
CIPHER="cipher AES-192-GCM"
;;
3)
CIPHER="cipher AES-256-GCM"
;;
4)
CIPHER="cipher AES-128-CBC"
;;
5)
CIPHER="cipher AES-192-CBC"
;;
6)
CIPHER="cipher AES-256-CBC"
;;
esac
echo ""
echo "Choose what kind of Diffie-Hellman key you want to use."
echo "Elleptic Curves (EC) are recommended, they're faster, lighter and more secure."
echo "Use DH for OpenVPN 2.3 compatibilty"
echo " 1) ECDH (recommended)"
echo " 2) DH"
while [[ $DH_TYPE != "1" && $DH_TYPE != "2" ]]; do
read -p "DH key size [1-2]: " -e -i 1 DH_TYPE
done
case $DH_TYPE in
1)
echo "Choose which curve you want to use"
echo " 1) secp256r1"
echo " 2) secp384r1 (recommended)"
echo " 3) secp521r1"
while [[ $DH_CURVE != "1" && $DH_CURVE != "2" && $DH_CURVE != "3" ]]; do
read -p "ECDH [1-3]: " -e -i 2 DH_CURVE
done
case $DH_CURVE in
1)
DH_CURVE="secp256r1"
;;
2)
DH_CURVE="secp384r1"
;;
3)
DH_CURVE="secp521r1"
;;
esac
;;
2)
echo "Choose which DH key size do you want to use"
echo " 1) 2048 bits"
echo " 2) 3072 bits (recommended)"
echo " 3) 4096 bits"
while [[ $DH_SIZE != "1" && $DH_SIZE != "2" && $DH_SIZE != "3" ]]; do
read -p "DH key size [1-3]: " -e -i 2 DH_SIZE
done
case $DH_SIZE in
1)
DH_SIZE="2048"
;;
2)
DH_SIZE="3072"
;;
3)
DH_SIZE="4096"
;;
esac
;;
esac
echo ""
echo "Choose what kind Certificate key you want to use."
echo "Elleptic Curves (EC) are recommended, they're faster, lighter and more secure."
echo "Use RSA for OpenVPN 2.3 compatibilty"
echo " 1) ECDSA (recommended)"
echo " 2) RSA"
while [[ $CERT_TYPE != "1" && $CERT_TYPE != "2" ]]; do
read -p "Certificate key [1-2]: " -e -i 1 CERT_TYPE
done
case $CERT_TYPE in
1)
echo "Choose which curve you want to use:"
echo " 1) secp256r1"
echo " 2) secp384r1 (recommended)"
echo " 3) secp521r1"
while [[ $CERT_CURVE != "1" && $CERT_CURVE != "2" && $CERT_CURVE != "3" ]]; do
read -p "ECDH [1-3]: " -e -i 2 CERT_CURVE
done
case $CERT_CURVE in
1)
CERT_CURVE="secp256r1"
;;
2)
CERT_CURVE="secp384r1"
;;
3)
CERT_CURVE="secp521r1"
;;
esac
;;
2)
echo "Choose which RSA key size do you want to use:"
echo " 1) 2048 bits"
echo " 2) 3072 bits (recommended)"
echo " 3) 4096 bits"
while [[ $RSA_SIZE != "1" && $RSA_SIZE != "2" && $RSA_SIZE != "3" ]]; do
read -p "DH key size [1-3]: " -e -i 2 RSA_SIZE
done
case $RSA_SIZE in
1)
RSA_SIZE="2048"
;;
2)
RSA_SIZE="3072"
;;
3)
RSA_SIZE="4096"
;;
esac
;;
esac
echo "Choose which hash algorithm you want to use for the certificate:"
echo " 1) SHA-256"
echo " 2) SHA-384 (recommended)"
echo " 3) SHA-512"
while [[ $CERT_HASH != "1" && $CERT_HASH != "2" && $CERT_HASH != "3" ]]; do
read -p "Cert hash algo [1-3]: " -e -i 2 CERT_HASH
done
case $CERT_HASH in
1)
CERT_HASH="sha256"
;;
2)
CERT_HASH="sha384"
;;
3)
CERT_HASH="sha512"
;;
esac
echo "Which cipher to use for the control channel ?"
if [[ "$CERT_TYPE" = '1' ]]; then
echo " 1) ECDHE-ECDSA-AES-256-GCM-SHA384 (recommended)"
echo " 2) ECDHE-ECDSA-AES-128-GCM-SHA256"
while [[ $CC_ENC != "1" && $CC_ENC != "2" ]]; do
read -p "Control Channel encryption [1-2]: " -e -i 1 CC_ENC
done
case $CC_ENC in
1)
CC_ENC="TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384"
;;
2)
CC_ENC="TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256"
;;
esac
elif [[ "$CERT_TYPE" = '2' ]]; then
echo " 1) ECDHE-RSA-AES-256-GCM-SHA384 (recommended)"
echo " 2) ECDHE-RSA-AES-128-GCM-SHA256"
while [[ $CC_ENC != "1" && $CC_ENC != "2" ]]; do
read -p "Control Channel encryption [1-2]: " -e -i 1 CC_ENC
done
case $CC_ENC in
1)
CC_ENC="TLS-ECDHE-RSA-WITH-AES-256-GCM-SHA384"
;;
2)
CC_ENC="TLS-ECDHE-RSA-WITH-AES-128-GCM-SHA256"
;;
esac
fi
if [[ $CIPHER != "1" && $CIPHER != "2" && $CIPHER != "3" ]]; then
echo "Choose which message digest algorithm you want to use for the tls-auth/tls-crypt control channel packets:"
fi
if [[ $CIPHER != "4" && $CIPHER != "5" && $CIPHER != "6" ]]; then
echo "Choose which message digest algorithm you want to use for the data channel packets"
echo "and the tls-auth/tls-crypt control channel packets:"
fi
echo " 1) SHA-256"
echo " 2) SHA-384 (recommended)"
echo " 3) SHA-512"
while [[ $HMAC_AUTH != "1" && $HMAC_AUTH != "2" && $HMAC_AUTH != "3" ]]; do
read -p "HMAC authentication algorithm [1-3]: " -e -i 2 HMAC_AUTH
done
case $HMAC_AUTH in
1)
HMAC_AUTH="SHA256"
;;
2)
HMAC_AUTH="SHA384"
;;
3)
HMAC_AUTH="SHA512"
;;
esac
echo "tls crypt or tls auth"
echo " 1) tls-crypt (recommended)"
echo " 2) tls-auth (use only for openvpn 2.3 compat)"
while [[ $TLS_SIG != "1" && $TLS_SIG != "2" ]]; do
read -p "tls sig [1-2]: " -e -i 1 TLS_SIG
done
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
[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
#To remember if we use tls-crypt or tls-auth when generating a new client conf
echo $TLS_SIG > /etc/openvpn/TLS_SIG
# 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/
if [[ $CERT_TYPE == "1" ]]; then
echo "set_var EASYRSA_ALGO ec
set_var EASYRSA_CURVE $CERT_CURVE" > vars
elif [[ $CERT_TYPE == "2" ]]; then
echo "set_var EASYRSA_KEY_SIZE $RSA_SIZE" > vars
fi
echo 'set_var EASYRSA_DIGEST "'$CERT_HASH'"' >> vars
# Create the PKI, set up the CA, the DH params and the server + client certificates
./easyrsa init-pki
./easyrsa --batch build-ca nopass
if [[ $DH_TYPE == "2" ]]; then
openssl dhparam -out dh.pem $DH_SIZE
fi
./easyrsa build-server-full server nopass
./easyrsa build-client-full $CLIENT nopass
./easyrsa gen-crl
if [[ $TLS_SIG == "1" ]]; then
# Generate tls-crypt key
openvpn --genkey --secret /etc/openvpn/tls-crypt.key
elif [[ $TLS_SIG == "2" ]]; then
# Generate tls-auth key
openvpn --genkey --secret /etc/openvpn/tls-auth.key
fi
# Move all the generated files
cp pki/ca.crt pki/private/ca.key pki/issued/server.crt pki/private/server.key /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn
if [[ $DH_TYPE == "2" ]]; then
cp dh.pem /etc/openvpn
fi
# Make cert revocation list readable for non-root
chmod 644 /etc/openvpn/crl.pem
# Generate server.conf
echo "local $IP" > /etc/openvpn/server.conf
echo "port $PORT" >> /etc/openvpn/server.conf
if [[ "$PROTOCOL" = '1' ]]; then
echo "proto udp" >> /etc/openvpn/server.conf
elif [[ "$PROTOCOL" = '2' ]]; 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
;;
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" >> /etc/openvpn/server.conf
if [[ $TLS_SIG == "1" ]]; then
echo "tls-crypt tls-crypt.key 0" >> /etc/openvpn/server.conf
elif [[ $TLS_SIG == "2" ]]; then
echo "tls-auth tls-auth.key 0" >> /etc/openvpn/server.conf
fi
if [[ $DH_TYPE == "1" ]]; then
echo "dh none
ecdh-curve $DH_CURVE" >> /etc/openvpn/server.conf
elif [[ $DH_TYPE == "2" ]]; then
echo "dh dh.pem" >> /etc/openvpn/server.conf
fi
echo "auth $HMAC_AUTH
$CIPHER
ncp-disable
tls-server
tls-version-min 1.2
tls-cipher $CC_ENC
status openvpn.log
verb 3" >> /etc/openvpn/server.conf
# Create the sysctl configuration file if needed (mainly for Arch Linux)
if [[ ! -e $SYSCTL ]]; then
touch $SYSCTL
fi
# Enable net.ipv4.ip_forward for the system
sed -i '/\<net.ipv4.ip_forward\>/c\net.ipv4.ip_forward=1' $SYSCTL
if ! grep -q "\<net.ipv4.ip_forward\>" $SYSCTL; then
echo 'net.ipv4.ip_forward=1' >> $SYSCTL
fi
# Avoid an unneeded reboot
echo 1 > /proc/sys/net/ipv4/ip_forward
# Needed to use rc.local with some systemd distros
if [[ "$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" = '1' ]]; then
firewall-cmd --zone=public --add-port=$PORT/udp
firewall-cmd --permanent --zone=public --add-port=$PORT/udp
elif [[ "$PROTOCOL" = '2' ]]; then
firewall-cmd --zone=public --add-port=$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" = '1' ]]; then
iptables -I INPUT -p udp --dport $PORT -j ACCEPT
elif [[ "$PROTOCOL" = '2' ]]; 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" = '1' ]]; then
sed -i "1 a\iptables -I INPUT -p udp --dport $PORT -j ACCEPT" $RCLOCAL
elif [[ "$PROTOCOL" = '2' ]]; 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" = '1' ]]; then
semanage port -a -t openvpn_port_t -p udp $PORT
elif [[ "$PROTOCOL" = '2' ]]; 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" = '1' ]]; then
echo "proto udp" >> /etc/openvpn/client-template.txt
elif [[ "$PROTOCOL" = '2' ]]; 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 $HMAC_AUTH
$CIPHER
tls-client
tls-version-min 1.2
tls-cipher $CC_ENC
setenv opt block-outside-dns
verb 3" >> /etc/openvpn/client-template.txt
# Generate the custom client.ovpn
newclient "$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;
Reference in New Issue View Git Blame Copy Permalink