mirror of
https://github.com/angristan/openvpn-install.git
synced 2024-11-22 00:39:03 +01:00
The crypto update 🔐
- Removed "fast" and "slow" mode (not a good idea, I prefer to give the choice for the parameters directly) - Corrected some confusion between the cipher for the data channel and the control channel, my bad. - using TLS-DHE-RSA-WITH-AES-256-GCM-SHA384 by default for the control channel - using SHA384 by default for HMAC auth and RSA certificate - giving the choice for the cipher of the data channel, the size of the DH key and the RSA Key I will explain all my choices here : https://github.com/Angristan/OpenVPN-install#encryption (likely tomorrow)
This commit is contained in:
Angristan
GitHub
parent
c03a55f11f
commit
56477bba34
@ -1,6 +1,6 @@
|
||||
#!/bin/bash
|
||||
|
||||
# Secure OpenVPN server installer for Debian, Ubuntu and CentOS.
|
||||
# Secure OpenVPN server installer for Debian, Ubuntu, CentOS and Arch Linux
|
||||
# https://github.com/Angristan/OpenVPN-install
|
||||
|
||||
|
||||
@ -57,7 +57,7 @@ fi
|
||||
|
||||
newclient () {
|
||||
# Generates the custom client.ovpn
|
||||
cp /etc/openvpn/client-common.txt ~/$1.ovpn
|
||||
cp /etc/openvpn/client-template.txt ~/$1.ovpn
|
||||
echo "<ca>" >> ~/$1.ovpn
|
||||
cat /etc/openvpn/easy-rsa/pki/ca.crt >> ~/$1.ovpn
|
||||
echo "</ca>" >> ~/$1.ovpn
|
||||
@ -85,6 +85,8 @@ 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?"
|
||||
@ -183,21 +185,12 @@ if [[ -e /etc/openvpn/server.conf ]]; then
|
||||
done
|
||||
else
|
||||
clear
|
||||
echo 'Welcome to the secure OpenVPN 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, choose which variant of the script you want to use."
|
||||
echo '"Fast" is secure, but "slow" provides you the best encryption you can get,'
|
||||
echo "at the cost of some speed (not that slow though)"
|
||||
echo " 1) Fast (2048 bits RSA and DH, 128 bits AES)"
|
||||
echo " 2) Slow (4096 bits RSA and DH, 256 bits AES)"
|
||||
while [[ $VARIANT != "1" && $VARIANT != "2" ]]; do
|
||||
read -p "Variant [1-2]: " -e -i 1 VARIANT
|
||||
done
|
||||
echo ""
|
||||
echo "I need to know the IPv4 address of the network interface you want OpenVPN listening to."
|
||||
echo "If you server is running behind a NAT, (e.g. LowEndSpirit, Scaleway) leave the IP adress as it is. (local/private IP)"
|
||||
echo "Otherwise, it sould be your public IPv4 address."
|
||||
@ -222,6 +215,86 @@ else
|
||||
read -p "DNS [1-5]: " -e -i 2 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, recommended)"
|
||||
echo " 2) AES-192-CBC"
|
||||
echo " 3) AES-256-CBC (most secure)"
|
||||
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"
|
||||
;;
|
||||
5)
|
||||
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 "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 a name for the client certificate and configuration"
|
||||
while [[ $CLIENT = "" ]]; do
|
||||
echo "Please, use one word only, no special characters"
|
||||
@ -326,29 +399,22 @@ WantedBy=multi-user.target" > /etc/systemd/system/rc-local.service
|
||||
chown -R root:root /etc/openvpn/easy-rsa/
|
||||
rm -rf ~/EasyRSA-3.0.1.tgz
|
||||
cd /etc/openvpn/easy-rsa/
|
||||
# If the user selected the fast, less hardened version
|
||||
if [[ "$VARIANT" = '1' ]]; then
|
||||
echo "set_var EASYRSA_KEY_SIZE 2048
|
||||
set_var EASYRSA_DIGEST "sha256"" > vars
|
||||
fi
|
||||
# If the user selected the relatively slow, ultra hardened version
|
||||
if [[ "$VARIANT" = '2' ]]; then
|
||||
echo "set_var EASYRSA_KEY_SIZE 4096
|
||||
set_var EASYRSA_DIGEST "sha384"" > vars
|
||||
fi
|
||||
echo "set_var EASYRSA_KEY_SIZE $RSA_KEY_SIZE" > vars
|
||||
echo 'set_var EASYRSA_DIGEST "sha384"' >> 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 $DH_KEY_SIZE -out dh.pem
|
||||
./easyrsa build-server-full server nopass
|
||||
./easyrsa build-client-full $CLIENT nopass
|
||||
./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 pki/dh.pem pki/issued/server.crt pki/private/server.key /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn
|
||||
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
|
||||
@ -357,26 +423,14 @@ set_var EASYRSA_DIGEST "sha384"" > vars
|
||||
echo "proto tcp" >> /etc/openvpn/server.conf
|
||||
fi
|
||||
echo "dev tun
|
||||
ca ca.crt
|
||||
cert server.crt
|
||||
key server.key
|
||||
dh dh.pem
|
||||
user nobody
|
||||
group $NOGROUP
|
||||
persist-key
|
||||
persist-tun
|
||||
keepalive 10 120
|
||||
topology subnet
|
||||
server 10.8.0.0 255.255.255.0
|
||||
ifconfig-pool-persist ipp.txt
|
||||
cipher AES-256-CBC
|
||||
auth SHA512
|
||||
tls-version-min 1.2" >> /etc/openvpn/server.conf
|
||||
if [[ "$VARIANT" = '1' ]]; then
|
||||
# If the user selected the fast, less hardened version
|
||||
echo "tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256" >> /etc/openvpn/server.conf
|
||||
elif [[ "$VARIANT" = '2' ]]; then
|
||||
# If the user selected the relatively slow, hardened version
|
||||
echo "tls-cipher TLS-DHE-RSA-WITH-AES-256-GCM-SHA384" >> /etc/openvpn/server.conf
|
||||
fi
|
||||
echo 'push "redirect-gateway def1 bypass-dhcp"' >> /etc/openvpn/server.conf
|
||||
ifconfig-pool-persist ipp.txt" >> /etc/openvpn/server.conf
|
||||
# DNS resolvers
|
||||
case $DNS in
|
||||
1)
|
||||
@ -402,13 +456,19 @@ tls-version-min 1.2" >> /etc/openvpn/server.conf
|
||||
echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server.conf
|
||||
;;
|
||||
esac
|
||||
echo "keepalive 10 120
|
||||
persist-key
|
||||
persist-tun
|
||||
crl-verify crl.pem
|
||||
tls-server
|
||||
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
|
||||
status openvpn-status.log
|
||||
dh dh.pem
|
||||
auth SHA384
|
||||
$CIPHER
|
||||
tls-server
|
||||
tls-version-min 1.2
|
||||
tls-cipher TLS-DHE-RSA-WITH-AES-256-GCM-SHA384
|
||||
status openvpn.log
|
||||
verb 3" >> /etc/openvpn/server.conf
|
||||
|
||||
# Create the sysctl configuration file if needed (mainly for Arch Linux)
|
||||
@ -506,12 +566,12 @@ verb 3" >> /etc/openvpn/server.conf
|
||||
IP=$USEREXTERNALIP
|
||||
fi
|
||||
fi
|
||||
# client-common.txt is created so we have a template to add further users later
|
||||
echo "client" > /etc/openvpn/client-common.txt
|
||||
# client-template.txt is created so we have a template to add further users later
|
||||
echo "client" > /etc/openvpn/client-template.txt
|
||||
if [[ "$PROTOCOL" = 'UDP' ]]; then
|
||||
echo "proto udp" >> /etc/openvpn/client-common.txt
|
||||
echo "proto udp" >> /etc/openvpn/client-template.txt
|
||||
elif [[ "$PROTOCOL" = 'TCP' ]]; then
|
||||
echo "proto tcp-client" >> /etc/openvpn/client-common.txt
|
||||
echo "proto tcp-client" >> /etc/openvpn/client-template.txt
|
||||
fi
|
||||
echo "remote $IP $PORT
|
||||
dev tun
|
||||
@ -519,20 +579,15 @@ resolv-retry infinite
|
||||
nobind
|
||||
persist-key
|
||||
persist-tun
|
||||
setenv opt block-outside-dns
|
||||
verb 3
|
||||
remote-cert-tls server
|
||||
cipher AES-256-CBC
|
||||
auth SHA512
|
||||
auth SHA384
|
||||
$CIPHER
|
||||
tls-client
|
||||
tls-version-min 1.2
|
||||
tls-client" >> /etc/openvpn/client-common.txt
|
||||
if [[ "$VARIANT" = '1' ]]; then
|
||||
# If the user selected the fast, less hardened version
|
||||
echo "tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256" >> /etc/openvpn/client-common.txt
|
||||
elif [[ "$VARIANT" = '2' ]]; then
|
||||
# If the user selected the relatively slow, hardened version
|
||||
echo "tls-cipher TLS-DHE-RSA-WITH-AES-256-GCM-SHA384" >> /etc/openvpn/client-common.txt
|
||||
fi
|
||||
tls-cipher TLS-DHE-RSA-WITH-AES-256-GCM-SHA384
|
||||
setenv opt block-outside-dns
|
||||
verb 3" >> /etc/openvpn/client-template.txt
|
||||
|
||||
# Generate the custom client.ovpn
|
||||
newclient "$CLIENT"
|
||||
echo ""
|
||||
|
||||
Loading…
Reference in New Issue
Block a user