diff --git a/openvpn-install.sh b/openvpn-install.sh
index 3b49d31..8f7c97d 100644
--- a/openvpn-install.sh
+++ b/openvpn-install.sh
@@ -25,7 +25,7 @@ if [[ -e /etc/debian_version ]]; then
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"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="17.04"' ]]; then
+ if [[ "$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 ""
@@ -75,10 +75,17 @@ newclient () {
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/$1.ovpn
+ #We verify if we used tls-crypt or tls-auth during the installation
+ TLS_SIG=$(cat /etc/openvpn/TLS_SIG)
+ if [[ $TLS_SIG == "1" ]]; then
+ cat /etc/openvpn/tls-crypt.key >> ~/$1.ovpn
+ echo "" >> ~/$1.ovpn
+ elif [[ $TLS_SIG == "2" ]]; then
+ echo "key-direction 1" >> $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+ cat /etc/openvpn/tls-auth.key >> $homeDir/$1.ovpn
+ echo "" >> $homeDir/$1.ovpn
+ fi
}
# Try to get our IP from the system and fallback to the Internet.
@@ -212,8 +219,10 @@ else
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
+ 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?"
@@ -229,83 +238,215 @@ else
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 "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 " 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
+ 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-CBC"
+ CIPHER="cipher AES-128-GCM"
;;
2)
- CIPHER="cipher AES-192-CBC"
+ CIPHER="cipher AES-192-GCM"
;;
3)
- CIPHER="cipher AES-256-CBC"
+ CIPHER="cipher AES-256-GCM"
;;
4)
- CIPHER="cipher CAMELLIA-128-CBC"
+ CIPHER="cipher AES-128-CBC"
;;
5)
- CIPHER="cipher CAMELLIA-192-CBC"
+ CIPHER="cipher AES-192-CBC"
;;
6)
- CIPHER="cipher CAMELLIA-256-CBC"
- ;;
- 7)
- CIPHER="cipher SEED-CBC"
+ CIPHER="cipher AES-256-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
+ 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_KEY_SIZE in
+ case $DH_TYPE in
1)
- DH_KEY_SIZE="2048"
+ 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)
- DH_KEY_SIZE="3072"
- ;;
- 3)
- DH_KEY_SIZE="4096"
+ 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 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
+ 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 $RSA_KEY_SIZE in
+ case $CERT_TYPE in
1)
- RSA_KEY_SIZE="2048"
+ 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)
- RSA_KEY_SIZE="3072"
- ;;
- 3)
- RSA_KEY_SIZE="4096"
+ 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" ]]; 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
+ echo "Choose which HMAC authentication algorithm you want to use"
+ echo " 1) SHA-256"
+ echo " 2) SHA-384 (recommended)"
+ echo " 3) SHA-512"
+ while [[ $HMAC_AUTH != "1" && $HMAC_AUTH != "2" ]]; do
+ read -p "HMAC authentication algorithmHMAC_AUTH [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
@@ -392,6 +533,10 @@ WantedBy=multi-user.target" > /etc/systemd/system/rc-local.service
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
@@ -411,27 +556,43 @@ WantedBy=multi-user.target" > /etc/systemd/system/rc-local.service
chown -R root:root /etc/openvpn/easy-rsa/
rm -rf ~/EasyRSA-3.0.3.tgz
cd /etc/openvpn/easy-rsa/
- echo "set_var EASYRSA_KEY_SIZE $RSA_KEY_SIZE" > vars
+ 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
- openssl dhparam -out dh.pem $DH_KEY_SIZE
+ 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
- # generate tls-auth key
- openvpn --genkey --secret /etc/openvpn/tls-auth.key
+ 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 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 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" = 'UDP' ]]; then
+ if [[ "$PROTOCOL" = '1' ]]; then
echo "proto udp" >> /etc/openvpn/server.conf
- elif [[ "$PROTOCOL" = 'TCP' ]]; then
+ elif [[ "$PROTOCOL" = '2' ]]; then
echo "proto tcp" >> /etc/openvpn/server.conf
fi
echo "dev tun
@@ -476,14 +637,23 @@ 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
+key server.key" >> /etc/openvpn/server.conf
+if [[ $TLS_SIG == "1" ]]; then
+ echo "tls-auth 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
tls-server
tls-version-min 1.2
-tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
+tls-cipher $CC_ENC
status openvpn.log
verb 3" >> /etc/openvpn/server.conf
@@ -512,10 +682,10 @@ verb 3" >> /etc/openvpn/server.conf
# We don't use --add-service=openvpn because that would only work with
# the default port. Using both permanent and not permanent rules to
# avoid a firewalld reload.
- if [[ "$PROTOCOL" = 'UDP' ]]; then
+ if [[ "$PROTOCOL" = '1' ]]; then
firewall-cmd --zone=public --add-port=$PORT/udp
firewall-cmd --permanent --zone=public --add-port=$PORT/udp
- elif [[ "$PROTOCOL" = 'TCP' ]]; then
+ elif [[ "$PROTOCOL" = '2' ]]; then
firewall-cmd --zone=public --add-port=$PORT/tcp
firewall-cmd --permanent --zone=public --add-port=$PORT/tcp
fi
@@ -526,16 +696,16 @@ verb 3" >> /etc/openvpn/server.conf
# If iptables has at least one REJECT rule, we asume this is needed.
# Not the best approach but I can't think of other and this shouldn't
# cause problems.
- if [[ "$PROTOCOL" = 'UDP' ]]; then
+ if [[ "$PROTOCOL" = '1' ]]; then
iptables -I INPUT -p udp --dport $PORT -j ACCEPT
- elif [[ "$PROTOCOL" = 'TCP' ]]; then
+ 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" = 'UDP' ]]; then
+ if [[ "$PROTOCOL" = '1' ]]; then
sed -i "1 a\iptables -I INPUT -p udp --dport $PORT -j ACCEPT" $RCLOCAL
- elif [[ "$PROTOCOL" = 'TCP' ]]; then
+ 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" $RCLOCAL
@@ -549,9 +719,9 @@ verb 3" >> /etc/openvpn/server.conf
if ! hash semanage 2>/dev/null; then
yum install policycoreutils-python -y
fi
- if [[ "$PROTOCOL" = 'UDP' ]]; then
+ if [[ "$PROTOCOL" = '1' ]]; then
semanage port -a -t openvpn_port_t -p udp $PORT
- elif [[ "$PROTOCOL" = 'TCP' ]]; then
+ elif [[ "$PROTOCOL" = '2' ]]; then
semanage port -a -t openvpn_port_t -p tcp $PORT
fi
fi
@@ -609,9 +779,9 @@ verb 3" >> /etc/openvpn/server.conf
fi
# client-template.txt is created so we have a template to add further users later
echo "client" > /etc/openvpn/client-template.txt
- if [[ "$PROTOCOL" = 'UDP' ]]; then
+ if [[ "$PROTOCOL" = '1' ]]; then
echo "proto udp" >> /etc/openvpn/client-template.txt
- elif [[ "$PROTOCOL" = 'TCP' ]]; then
+ elif [[ "$PROTOCOL" = '2' ]]; then
echo "proto tcp-client" >> /etc/openvpn/client-template.txt
fi
echo "remote $IP $PORT
@@ -621,11 +791,11 @@ nobind
persist-key
persist-tun
remote-cert-tls server
-auth SHA256
+auth $HMAC_AUTH
$CIPHER
tls-client
tls-version-min 1.2
-tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
+tls-cipher $CC_ENC
setenv opt block-outside-dns
verb 3" >> /etc/openvpn/client-template.txt