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Add ECDSA support and make tls-cipher configurable

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angristan
2018-09-22 15:11:15 +02:00
parent 06e7597942
commit 4d1baca0c7
1 changed files with 99 additions and 23 deletions
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122
openvpn-install.sh
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@@ -283,8 +283,10 @@ function installOpenVPN () {
if [[ $CUSTOMIZE_ENC == "n" ]];then
# Use default, sane and fast paramters
CIPHER="cipher AES-128-GCM"
CERT_TYPE="1"
CERT_CURVE="secp256r1"
CC_CIPHER="TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256"
DH_KEY_SIZE="2048"
RSA_KEY_SIZE="2048"
else
echo ""
echo "Choose which cipher you want to use for the data channel:"
@@ -318,6 +320,91 @@ function installOpenVPN () {
;;
esac
echo ""
echo "Choose what kind of certificate you want to use."
echo " 1) ECDSA (recommended)"
echo " 2) RSA"
until [[ $CERT_TYPE =~ [1-2] ]]; do
read -p "Certificate key type [1-2]: " -e -i 1 CERT_TYPE
done
case $CERT_TYPE in
1)
echo ""
echo "Choose which curve you want to use for the certificate's key:"
echo " 1) secp256r1 (recommended)"
echo " 2) secp384r1"
echo " 3) secp521r1"
until [[ $CERT_CURVE_CHOICE =~ [1-3] ]]; do
read -p "Curve [1-3]: " -e -i 1 CERT_CURVE_CHOICE
done
case $CERT_CURVE_CHOICE in
1)
CERT_CURVE="secp256r1"
;;
2)
CERT_CURVE="secp384r1"
;;
3)
CERT_CURVE="secp521r1"
;;
esac
;;
2)
echo ""
echo "Choose which size you want to use for the certificate's RSA key:"
echo " 1) 2048 bits (recommended)"
echo " 2) 3072 bits"
echo " 3) 4096 bits"
until [[ "$RSA_KEY_SIZE_CHOICE" =~ ^[1-3]$ ]]; do
read -rp "RSA key size [1-3]: " -e -i 1 RSA_KEY_SIZE_CHOICE
done
case $RSA_KEY_SIZE_CHOICE in
1)
RSA_KEY_SIZE="2048"
;;
2)
RSA_KEY_SIZE="3072"
;;
3)
RSA_KEY_SIZE="4096"
;;
esac
;;
esac
echo ""
echo "Choose which cipher you want to use for the control channel:"
case $CERT_TYPE in
1)
echo " 1) ECDHE-ECDSA-AES-128-GCM-SHA256 (recommended)"
echo " 2) ECDHE-ECDSA-AES-256-GCM-SHA384"
until [[ $CC_CIPHER_CHOICE =~ [1-2] ]]; do
read -p "Control channel cipher [1-2]: " -e -i 1 CC_CIPHER_CHOICE
done
case $CC_CIPHER_CHOICE in
1)
CC_CIPHER="TLS-ECDHE-ECDSA-WITH-AES-128-GCM-SHA256"
;;
2)
CC_CIPHER="TLS-ECDHE-ECDSA-WITH-AES-256-GCM-SHA384"
;;
esac
;;
2)
echo " 1) ECDHE-RSA-AES-128-GCM-SHA256 (recommended)"
echo " 2) ECDHE-RSA-AES-256-GCM-SHA384"
until [[ $CC_CIPHER_CHOICE =~ [1-2] ]]; do
read -p "Control channel cipher [1-2]: " -e -i 1 CC_CIPHER_CHOICE
done
case $CC_CIPHER_CHOICE in
1)
CC_CIPHER="TLS-ECDHE-RSA-WITH-AES-128-GCM-SHA256"
;;
2)
CC_CIPHER="TLS-ECDHE-RSA-WITH-AES-256-GCM-SHA384"
;;
esac
;;
esac
echo ""
echo "Choose what size of Diffie-Hellman key you want to use:"
echo " 1) 2048 bits (recommended)"
echo " 2) 3072 bits"
@@ -336,25 +423,6 @@ function installOpenVPN () {
DH_KEY_SIZE="4096"
;;
esac
echo ""
echo "Choose what size of RSA key you want to use for the certificate:"
echo " 1) 2048 bits (recommended)"
echo " 2) 3072 bits"
echo " 3) 4096 bits"
until [[ "$RSA_KEY_SIZE_CHOICE" =~ ^[0-9]+$ ]] && [ "$RSA_KEY_SIZE_CHOICE" -ge 1 ] && [ "$RSA_KEY_SIZE_CHOICE" -le 3 ]; do
read -rp "RSA key size [1-3]: " -e -i 1 RSA_KEY_SIZE_CHOICE
done
case $RSA_KEY_SIZE_CHOICE in
1)
RSA_KEY_SIZE="2048"
;;
2)
RSA_KEY_SIZE="3072"
;;
3)
RSA_KEY_SIZE="4096"
;;
esac
fi
echo ""
echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now."
@@ -403,10 +471,18 @@ function installOpenVPN () {
rm -f ~/EasyRSA-${version}.tgz
cd /etc/openvpn/easy-rsa/
case $CERT_TYPE in
1)
echo "set_var EASYRSA_ALGO ec" > vars
echo "set_var EASYRSA_CURVE $CERT_CURVE" >> vars
;;
2)
echo "set_var EASYRSA_KEY_SIZE $RSA_KEY_SIZE" > vars
;;
esac
# Generate a random, alphanumeric identifier of 16 characters for CN and one for server name
SERVER_CN="cn_$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)"
SERVER_NAME="server_$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 16 | head -n 1)"
echo "set_var EASYRSA_KEY_SIZE $RSA_KEY_SIZE" > vars
echo "set_var EASYRSA_REQ_CN $SERVER_CN" >> vars
# Create the PKI, set up the CA, the DH params and the server certificate
./easyrsa init-pki
@@ -515,7 +591,7 @@ auth SHA256
$CIPHER
tls-server
tls-version-min 1.2
tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
tls-cipher $CC_CIPHER
status /var/log/openvpn/status.log
verb 3" >> /etc/openvpn/server.conf
@@ -643,7 +719,7 @@ auth-nocache
$CIPHER
tls-client
tls-version-min 1.2
tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
tls-cipher $CC_CIPHER
setenv opt block-outside-dns # Prevent Windows 10 DNS leak
verb 3" >> /etc/openvpn/client-template.txt