mirror of
https://github.com/namibia/openvpn-install.git
synced 2024-12-22 23:08:55 +00:00
373 lines
12 KiB
Bash
373 lines
12 KiB
Bash
#!/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.
|
|
|
|
|
|
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
|
|
RCLOCAL='/etc/rc.local'
|
|
elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
|
|
OS=centos
|
|
RCLOCAL='/etc/rc.d/rc.local'
|
|
# Needed for CentOS 7
|
|
chmod +x /etc/rc.d/rc.local
|
|
else
|
|
echo "Looks like you aren't running this installer on a Debian, Ubuntu or CentOS system"
|
|
exit 4
|
|
fi
|
|
|
|
newclient () {
|
|
# Generates the custom client.ovpn
|
|
cp /etc/openvpn/client-common.txt ~/$1.ovpn
|
|
echo "<ca>" >> ~/$1.ovpn
|
|
cat /etc/openvpn/easy-rsa/pki/ca.crt >> ~/$1.ovpn
|
|
echo "</ca>" >> ~/$1.ovpn
|
|
echo "<cert>" >> ~/$1.ovpn
|
|
cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> ~/$1.ovpn
|
|
echo "</cert>" >> ~/$1.ovpn
|
|
echo "<key>" >> ~/$1.ovpn
|
|
cat /etc/openvpn/easy-rsa/pki/private/$1.key >> ~/$1.ovpn
|
|
echo "</key>" >> ~/$1.ovpn
|
|
}
|
|
|
|
|
|
# Try to get our IP from the system and fallback to the Internet.
|
|
# I do this to make the script compatible with NATed servers (LowEndSpirit/Scaleway)
|
|
# and to avoid getting an IPv6.
|
|
IP=$(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
|
|
|
|
|
|
if [[ -e /etc/openvpn/server.conf ]]; then
|
|
while :
|
|
do
|
|
clear
|
|
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 $CLIENT added, certs available at ~/$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 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
|
|
echo ""
|
|
echo "Certificate for client $CLIENT revoked"
|
|
exit
|
|
;;
|
|
3)
|
|
echo ""
|
|
read -p "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
|
|
if [[ "$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 | 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' $RCLOCAL
|
|
if which sestatus; then
|
|
if sestatus | grep "Current mode" | grep -qs "enforcing"; then
|
|
if [[ "$PORT" != '1194' ]]; then
|
|
semanage port -d -t openvpn_port_t -p udp $PORT
|
|
fi
|
|
fi
|
|
fi
|
|
if [[ "$OS" = 'debian' ]]; then
|
|
apt-get remove --purge -y openvpn openvpn-blacklist
|
|
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 this quick OpenVPN "road warrior" installer'
|
|
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."
|
|
read -p "IP address: " -e -i $IP IP
|
|
echo ""
|
|
echo "What port do you want for OpenVPN?"
|
|
read -p "Port: " -e -i 1194 PORT
|
|
echo ""
|
|
echo "What DNS do you want to use with the VPN?"
|
|
echo " 1) Current system resolvers"
|
|
echo " 2) FDN (recommended)"
|
|
echo " 3) OpenDNS"
|
|
echo " 4) NTT"
|
|
echo " 5) Google"
|
|
echo " 6) Hurricane Electric"
|
|
read -p "DNS [1-6]: " -e -i 2 DNS
|
|
echo ""
|
|
echo "Finally, tell me your name for the client cert"
|
|
echo "Please, use one word only, no special characters"
|
|
read -p "Client name: " -e -i client CLIENT
|
|
echo ""
|
|
echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now"
|
|
read -n1 -r -p "Press any key to continue..."
|
|
if [[ "$OS" = 'debian' ]]; then
|
|
apt-get update
|
|
apt-get install openvpn iptables openssl ca-certificates -y
|
|
else
|
|
# Else, the distro is CentOS
|
|
yum install epel-release -y
|
|
yum install openvpn iptables openssl wget ca-certificates -y
|
|
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/
|
|
chown -R root:root /etc/openvpn/easy-rsa/
|
|
rm -rf ~/EasyRSA-3.0.1.tgz
|
|
cd /etc/openvpn/easy-rsa/
|
|
#Use 4096 bits DH instead of 2048 bits
|
|
echo "set_var EASYRSA_KEY_SIZE 4096" > 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
|
|
./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 /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn
|
|
# Generate server.conf
|
|
echo "port $PORT
|
|
proto udp
|
|
dev tun
|
|
sndbuf 0
|
|
rcvbuf 0
|
|
ca ca.crt
|
|
cert server.crt
|
|
key server.key
|
|
dh dh.pem
|
|
cipher AES-256-CBC
|
|
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
|
|
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 $line\"" >> /etc/openvpn/server.conf
|
|
done
|
|
;;
|
|
2)
|
|
echo 'push "dhcp-option DNS 80.67.169.12"' >> /etc/openvpn/server.conf
|
|
echo 'push "dhcp-option DNS 80.67.169.40"' >> /etc/openvpn/server.conf
|
|
;;
|
|
3)
|
|
echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server.conf
|
|
echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server.conf
|
|
;;
|
|
4)
|
|
echo 'push "dhcp-option DNS 129.250.35.250"' >> /etc/openvpn/server.conf
|
|
echo 'push "dhcp-option DNS 129.250.35.251"' >> /etc/openvpn/server.conf
|
|
;;
|
|
5)
|
|
echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server.conf
|
|
echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server.conf
|
|
;;
|
|
6)
|
|
echo 'push "dhcp-option DNS 74.82.42.42"' >> /etc/openvpn/server.conf
|
|
;;
|
|
esac
|
|
echo "keepalive 10 120
|
|
comp-lzo
|
|
persist-key
|
|
persist-tun
|
|
crl-verify crl.pem" >> /etc/openvpn/server.conf
|
|
# Enable net.ipv4.ip_forward for the system
|
|
if [[ "$OS" = 'debian' ]]; then
|
|
sed -i 's|#net.ipv4.ip_forward=1|net.ipv4.ip_forward=1|' /etc/sysctl.conf
|
|
else
|
|
# CentOS 5 and 6
|
|
sed -i 's|net.ipv4.ip_forward = 0|net.ipv4.ip_forward = 1|' /etc/sysctl.conf
|
|
# CentOS 7
|
|
if ! grep -q "net.ipv4.ip_forward=1" "/etc/sysctl.conf"; then
|
|
echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf
|
|
fi
|
|
fi
|
|
# Avoid an unneeded reboot
|
|
echo 1 > /proc/sys/net/ipv4/ip_forward
|
|
# Set NAT for the VPN subnet
|
|
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP
|
|
sed -i "1 a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP" $RCLOCAL
|
|
if pgrep firewalld; then
|
|
# We don't use --add-service=openvpn because that would only work with
|
|
# the default port. Using both permanent and not permanent rules to
|
|
# avoid a firewalld reload.
|
|
firewall-cmd --zone=public --add-port=$PORT/udp
|
|
firewall-cmd --zone=trusted --add-source=10.8.0.0/24
|
|
firewall-cmd --permanent --zone=public --add-port=$PORT/udp
|
|
firewall-cmd --permanent --zone=trusted --add-source=10.8.0.0/24
|
|
fi
|
|
if iptables -L | 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 udp --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 udp --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" $RCLOCAL
|
|
fi
|
|
# If SELinux is enabled and a custom port was selected, we need this
|
|
if which sestatus; then
|
|
if sestatus | grep "Current mode" | grep -qs "enforcing"; then
|
|
if [[ "$PORT" != '1194' ]]; then
|
|
# semanage isn't available in CentOS 6 by default
|
|
if ! which semanage > /dev/null 2>&1; then
|
|
yum install policycoreutils-python -y
|
|
fi
|
|
semanage port -a -t openvpn_port_t -p udp $PORT
|
|
fi
|
|
fi
|
|
fi
|
|
# And finally, restart OpenVPN
|
|
if [[ "$OS" = 'debian' ]]; then
|
|
# Little hack to check for systemd
|
|
if pgrep systemd-journal; then
|
|
systemctl restart openvpn@server.service
|
|
else
|
|
/etc/init.d/openvpn restart
|
|
fi
|
|
else
|
|
if pgrep systemd-journal; then
|
|
systemctl restart openvpn@server.service
|
|
systemctl enable openvpn@server.service
|
|
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" != "$EXTERNALIP" ]]; then
|
|
echo ""
|
|
echo "Looks like your server is behind a NAT!"
|
|
echo ""
|
|
echo "If your server is NATed (e.g. LowEndSpirit, Scaleway), I need to know the external IP"
|
|
echo "If that's not the case, just ignore this and leave the next field blank"
|
|
read -p "External IP: " -e USEREXTERNALIP
|
|
if [[ "$USEREXTERNALIP" != "" ]]; then
|
|
IP=$USEREXTERNALIP
|
|
fi
|
|
fi
|
|
# client-common.txt is created so we have a template to add further users later
|
|
echo "client
|
|
dev tun
|
|
proto udp
|
|
sndbuf 0
|
|
rcvbuf 0
|
|
remote $IP $PORT
|
|
resolv-retry infinite
|
|
nobind
|
|
persist-key
|
|
persist-tun
|
|
remote-cert-tls server
|
|
cipher AES-256-CBC
|
|
comp-lzo" > /etc/openvpn/client-common.txt
|
|
# Generates the custom client.ovpn
|
|
newclient "$CLIENT"
|
|
echo ""
|
|
echo "Finished!"
|
|
echo ""
|
|
echo "Your client config is available at ~/$CLIENT.ovpn"
|
|
echo "If you want to add more clients, you simply need to run this script another time!"
|
|
fi
|