diff --git a/openvpn-install.sh b/openvpn-install.sh
index 646ff87..1216b50 100644
--- a/openvpn-install.sh
+++ b/openvpn-install.sh
@@ -5,22 +5,22 @@
# Copyright (c) 2013 Nyr. Released under the MIT License.
-if grep -qs "14.04" "/etc/os-release"; then
+if grep -qs "14.04" /etc/os-release; then
echo "Ubuntu 14.04 is too old and not supported"
exit
fi
-if grep -qs "jessie" "/etc/os-release"; then
+if grep -qs "jessie" /etc/os-release; then
echo "Debian 8 is too old and not supported"
exit
fi
-if grep -qs "CentOS release 6" "/etc/redhat-release"; then
+if grep -qs "CentOS release 6" /etc/redhat-release; then
echo "CentOS 6 is too old and not supported"
exit
fi
-if grep -qs "Ubuntu 16.04" "/etc/os-release"; then
+if grep -qs "Ubuntu 16.04" /etc/os-release; then
echo 'Ubuntu 16.04 is no longer supported in the current version of openvpn-install
Use an older version if Ubuntu 16.04 support is needed: https://git.io/vpn1604'
exit
@@ -44,31 +44,33 @@ You need to enable TUN before running this script"
fi
if [[ -e /etc/debian_version ]]; then
- OS=debian
- GROUPNAME=nogroup
+ os="debian"
+ group_name="nogroup"
elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
- OS=centos
- GROUPNAME=nobody
+ os="centos"
+ group_name="nobody"
else
echo "Looks like you aren't running this installer on Debian, Ubuntu or CentOS"
exit
fi
-newclient () {
+new_client () {
# Generates the custom client.ovpn
- cp /etc/openvpn/server/client-common.txt ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- cat /etc/openvpn/server/easy-rsa/pki/ca.crt >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- sed -ne '/BEGIN CERTIFICATE/,$ p' /etc/openvpn/server/easy-rsa/pki/issued/$1.crt >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- cat /etc/openvpn/server/easy-rsa/pki/private/$1.key >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- sed -ne '/BEGIN OpenVPN Static key/,$ p' /etc/openvpn/server/ta.key >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
+ {
+ cat /etc/openvpn/server/client-common.txt
+ echo ""
+ cat /etc/openvpn/server/easy-rsa/pki/ca.crt
+ echo ""
+ echo ""
+ sed -ne '/BEGIN CERTIFICATE/,$ p' /etc/openvpn/server/easy-rsa/pki/issued/"$1".crt
+ echo ""
+ echo ""
+ cat /etc/openvpn/server/easy-rsa/pki/private/"$1".key
+ echo ""
+ echo ""
+ sed -ne '/BEGIN OpenVPN Static key/,$ p' /etc/openvpn/server/tc.key
+ echo ""
+ } > ~/"$1".ovpn
}
if [[ -e /etc/openvpn/server/server.conf ]]; then
@@ -82,26 +84,35 @@ if [[ -e /etc/openvpn/server/server.conf ]]; then
echo " 2) Revoke an existing user"
echo " 3) Remove OpenVPN"
echo " 4) Exit"
- read -p "Select an option [1-4]: " option
- case $option in
+ read -p "Select an option: " option
+ until [[ "$option" =~ ^[1-4]$ ]]; do
+ echo "$option: invalid selection."
+ read -p "Select an option: " option
+ done
+ case "$option" in
1)
echo
echo "Tell me a name for the client certificate."
- echo "Please, use one word only, no special characters."
- read -p "Client name: " -e CLIENT
+ read -p "Client name: " unsanitized_client
+ client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
+ while [[ -z "$client" || -e /etc/openvpn/server/easy-rsa/pki/issued/"$client".crt ]]; do
+ echo "$client: invalid client name."
+ read -p "Client name: " unsanitized_client
+ client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
+ done
cd /etc/openvpn/server/easy-rsa/
- EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-client-full $CLIENT nopass
+ EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-client-full "$client" nopass
# Generates the custom client.ovpn
- newclient "$CLIENT"
+ new_client "$client"
echo
- echo "Client $CLIENT added, configuration is available at:" ~/"$CLIENT.ovpn"
+ echo "Client $client added, configuration is available at:" ~/"$client.ovpn"
exit
;;
2)
# This option could be documented a bit better and maybe even be simplified
# ...but what can I say, I want some sleep too
- NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep -c "^V")
- if [[ "$NUMBEROFCLIENTS" = '0' ]]; then
+ number_of_clients=$(tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep -c "^V")
+ if [[ "$number_of_clients" = 0 ]]; then
echo
echo "You have no existing clients!"
exit
@@ -109,60 +120,68 @@ if [[ -e /etc/openvpn/server/server.conf ]]; then
echo
echo "Select the existing client certificate you want to revoke:"
tail -n +2 /etc/openvpn/server/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=$(tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$CLIENTNUMBER"p)
+ read -p "Select one client: " client_number
+ until [[ "$client_number" =~ ^[0-9]+$ && "$client_number" -le "$number_of_clients" ]]; do
+ echo "$client_number: invalid selection."
+ read -p "Select one client: " client_number
+ done
+ client=$(tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$client_number"p)
echo
- read -p "Do you really want to revoke access for client $CLIENT? [y/N]: " -e REVOKE
- if [[ "$REVOKE" = 'y' || "$REVOKE" = 'Y' ]]; then
+ read -p "Do you really want to revoke access for client $client? [y/N]: " revoke
+ until [[ "$revoke" =~ ^[yYnN]*$ ]]; do
+ echo "$revoke: invalid selection."
+ read -p "Do you really want to revoke access for client $client? [y/N]: " revoke
+ done
+ if [[ "$revoke" =~ ^[yY]$ ]]; then
cd /etc/openvpn/server/easy-rsa/
- ./easyrsa --batch revoke $CLIENT
+ ./easyrsa --batch revoke "$client"
EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
- rm -f pki/reqs/$CLIENT.req
- rm -f pki/private/$CLIENT.key
- rm -f pki/issued/$CLIENT.crt
+ rm -f pki/reqs/"$client".req
+ rm -f pki/private/"$client".key
+ rm -f pki/issued/"$client".crt
rm -f /etc/openvpn/server/crl.pem
cp /etc/openvpn/server/easy-rsa/pki/crl.pem /etc/openvpn/server/crl.pem
# CRL is read with each client connection, when OpenVPN is dropped to nobody
- chown nobody:$GROUPNAME /etc/openvpn/server/crl.pem
+ chown nobody:"$group_name" /etc/openvpn/server/crl.pem
echo
- echo "Certificate for client $CLIENT revoked!"
+ echo "Certificate for client $client revoked!"
else
echo
- echo "Certificate revocation for client $CLIENT aborted!"
+ echo "Certificate revocation for client $client aborted!"
fi
exit
;;
3)
echo
- read -p "Do you really want to remove OpenVPN? [y/N]: " -e REMOVE
- if [[ "$REMOVE" = 'y' || "$REMOVE" = 'Y' ]]; then
- PORT=$(grep '^port ' /etc/openvpn/server/server.conf | cut -d " " -f 2)
- PROTOCOL=$(grep '^proto ' /etc/openvpn/server/server.conf | cut -d " " -f 2)
+ read -p "Do you really want to remove OpenVPN? [y/N]: " remove
+ until [[ "$remove" =~ ^[yYnN]*$ ]]; do
+ echo "$remove: invalid selection."
+ read -p "Do you really want to remove OpenVPN? [y/N]: " remove
+ done
+ if [[ "$remove" =~ ^[yY]$ ]]; then
+ port=$(grep '^port ' /etc/openvpn/server/server.conf | cut -d " " -f 2)
+ protocol=$(grep '^proto ' /etc/openvpn/server/server.conf | cut -d " " -f 2)
if pgrep firewalld; then
- IP=$(firewall-cmd --direct --get-rules ipv4 nat POSTROUTING | grep '\-s 10.8.0.0/24 '"'"'!'"'"' -d 10.8.0.0/24 -j SNAT --to ' | cut -d " " -f 10)
+ ip=$(firewall-cmd --direct --get-rules ipv4 nat POSTROUTING | grep '\-s 10.8.0.0/24 '"'"'!'"'"' -d 10.8.0.0/24 -j SNAT --to ' | cut -d " " -f 10)
# Using both permanent and not permanent rules to avoid a firewalld reload.
- firewall-cmd --remove-port=$PORT/$PROTOCOL
+ firewall-cmd --remove-port="$port"/"$protocol"
firewall-cmd --zone=trusted --remove-source=10.8.0.0/24
- firewall-cmd --permanent --remove-port=$PORT/$PROTOCOL
+ firewall-cmd --permanent --remove-port="$port"/"$protocol"
firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
- firewall-cmd --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
- firewall-cmd --permanent --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
+ firewall-cmd --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to "$ip"
+ firewall-cmd --permanent --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to "$ip"
else
systemctl disable --now openvpn-iptables.service
rm -f /etc/systemd/system/openvpn-iptables.service
fi
- if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$PORT" != '1194' ]]; then
- semanage port -d -t openvpn_port_t -p $PROTOCOL $PORT
+ if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$port" != 1194 ]]; then
+ semanage port -d -t openvpn_port_t -p "$protocol" "$port"
fi
systemctl disable --now openvpn-server@server.service
rm -rf /etc/openvpn/server
rm -f /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
rm -f /etc/sysctl.d/30-openvpn-forward.conf
- if [[ "$OS" = 'debian' ]]; then
+ if [[ "$os" = "debian" ]]; then
apt-get remove --purge -y openvpn
else
yum remove openvpn -y
@@ -180,39 +199,59 @@ if [[ -e /etc/openvpn/server/server.conf ]]; then
done
else
clear
- echo 'Welcome to this OpenVPN "road warrior" installer!'
+ echo "Welcome to this 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, provide the IPv4 address of the network interface you want OpenVPN"
- echo "listening to."
- # Autodetect IP address and pre-fill for the user
- IP=$(ip addr | grep 'inet' | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1)
- read -p "IP address: " -e -i $IP IP
+ echo "I need to ask you a few questions before starting setup."
+ echo "You can use the default options and just press enter if you are ok with them."
+ # If system has a single IPv4, it is selected automatically. Else, ask the user
+ if [[ $(ip addr | grep inet | grep -v inet6 | grep -vEc '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}') -eq 1 ]]; then
+ ip=$(ip addr | grep inet | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}')
+ else
+ number_of_ips=$(ip addr | grep inet | grep -v inet6 | grep -vEc '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}')
+ echo
+ echo "What IPv4 address should the OpenVPN server bind to?"
+ ip addr | grep inet | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | nl -s ') '
+ read -p "IPv4 address [1]: " ip_number
+ until [[ -z "$ip_number" || "$ip_number" =~ ^[0-9]+$ && "$ip_number" -le "$number_of_ips" ]]; do
+ echo "$ip_number: invalid selection."
+ read -p "IPv4 address [1]: " ip_number
+ done
+ [[ -z "$ip_number" ]] && ip_number="1"
+ ip=$(ip addr | grep inet | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | sed -n "$ip_number"p)
+ fi
# If $IP is a private IP address, the server must be behind NAT
- if echo "$IP" | grep -qE '^(10\.|172\.1[6789]\.|172\.2[0-9]\.|172\.3[01]\.|192\.168)'; then
+ if echo "$ip" | grep -qE '^(10\.|172\.1[6789]\.|172\.2[0-9]\.|172\.3[01]\.|192\.168)'; then
echo
echo "This server is behind NAT. What is the public IPv4 address or hostname?"
- read -p "Public IP address / hostname: " -e PUBLICIP
+ get_public_ip=$(wget -4qO- "http://whatismyip.akamai.com/" || curl -4Ls "http://whatismyip.akamai.com/")
+ read -p "Public IPv4 address / hostname [$get_public_ip]: " public_ip
+ [ -z "$public_ip" ] && public_ip="$get_public_ip"
fi
echo
echo "Which protocol do you want for OpenVPN connections?"
echo " 1) UDP (recommended)"
echo " 2) TCP"
- read -p "Protocol [1-2]: " -e -i 1 PROTOCOL
- case $PROTOCOL in
- 1)
- PROTOCOL=udp
+ read -p "Protocol [1]: " protocol
+ until [[ -z "$protocol" || "$protocol" =~ ^[12]$ ]]; do
+ echo "$protocol: invalid selection."
+ read -p "Protocol [1]: " protocol
+ done
+ case "$protocol" in
+ 1|"")
+ protocol=udp
;;
2)
- PROTOCOL=tcp
+ protocol=tcp
;;
esac
echo
echo "What port do you want OpenVPN listening to?"
- read -p "Port: " -e -i 1194 PORT
+ read -p "Port [1194]: " port
+ until [[ -z "$port" || "$port" =~ ^[0-9]+$ && "$port" -le 65535 ]]; do
+ echo "$port: invalid selection."
+ read -p "Port [1194]: " port
+ done
+ [[ -z "$port" ]] && port="1194"
echo
echo "Which DNS do you want to use with the VPN?"
echo " 1) Current system resolvers"
@@ -220,21 +259,27 @@ else
echo " 3) Google"
echo " 4) OpenDNS"
echo " 5) Verisign"
- read -p "DNS [1-5]: " -e -i 1 DNS
+ read -p "DNS [1]: " dns
+ until [[ -z "$dns" || "$dns" =~ ^[1-5]$ ]]; do
+ echo "$dns: invalid selection."
+ read -p "DNS [1]: " dns
+ done
echo
- echo "Finally, tell me your name for the client certificate."
- echo "Please, use one word only, no special characters."
- read -p "Client name: " -e -i client CLIENT
+ echo "Finally, tell me a name for the client certificate."
+ read -p "Client name [client]: " unsanitized_client
+ # Allow a limited set of characters to avoid conflicts
+ client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
+ [[ -z "$client" ]] && client="client"
echo
echo "Okay, that was all I needed. We are ready to set up your OpenVPN server now."
read -n1 -r -p "Press any key to continue..."
# If running inside a container, disable LimitNPROC to prevent conflicts
if systemd-detect-virt -cq; then
mkdir /etc/systemd/system/openvpn-server@server.service.d/ 2>/dev/null
- echo '[Service]
-LimitNPROC=infinity' > /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
+ echo "[Service]
+LimitNPROC=infinity" > /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
fi
- if [[ "$OS" = 'debian' ]]; then
+ if [[ "$os" = "debian" ]]; then
apt-get update
apt-get install openvpn iptables openssl ca-certificates -y
else
@@ -243,8 +288,8 @@ LimitNPROC=infinity' > /etc/systemd/system/openvpn-server@server.service.d/disab
yum install openvpn iptables openssl ca-certificates -y
fi
# Get easy-rsa
- EASYRSAURL='https://github.com/OpenVPN/easy-rsa/releases/download/v3.0.5/EasyRSA-nix-3.0.5.tgz'
- wget -O ~/easyrsa.tgz "$EASYRSAURL" 2>/dev/null || curl -Lo ~/easyrsa.tgz "$EASYRSAURL"
+ easy_rsa_url='https://github.com/OpenVPN/easy-rsa/releases/download/v3.0.5/EasyRSA-nix-3.0.5.tgz'
+ wget -O ~/easyrsa.tgz "$easy_rsa_url" 2>/dev/null || curl -Lo ~/easyrsa.tgz "$easy_rsa_url"
tar xzf ~/easyrsa.tgz -C ~/
mv ~/EasyRSA-3.0.5/ /etc/openvpn/server/
mv /etc/openvpn/server/EasyRSA-3.0.5/ /etc/openvpn/server/easy-rsa/
@@ -255,14 +300,14 @@ LimitNPROC=infinity' > /etc/systemd/system/openvpn-server@server.service.d/disab
./easyrsa init-pki
./easyrsa --batch build-ca nopass
EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-server-full server nopass
- EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-client-full $CLIENT nopass
+ EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-client-full "$client" nopass
EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
# Move the stuff we need
cp pki/ca.crt pki/private/ca.key pki/issued/server.crt pki/private/server.key pki/crl.pem /etc/openvpn/server
# CRL is read with each client connection, when OpenVPN is dropped to nobody
- chown nobody:$GROUPNAME /etc/openvpn/server/crl.pem
- # Generate key for tls-auth
- openvpn --genkey --secret /etc/openvpn/server/ta.key
+ chown nobody:"$group_name" /etc/openvpn/server/crl.pem
+ # Generate key for tls-crypt
+ openvpn --genkey --secret /etc/openvpn/server/tc.key
# Create the DH parameters file using the predefined ffdhe2048 group
echo '-----BEGIN DH PARAMETERS-----
MIIBCAKCAQEA//////////+t+FRYortKmq/cViAnPTzx2LnFg84tNpWp4TZBFGQz
@@ -273,33 +318,32 @@ YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi
ssbzSibBsu/6iGtCOGEoXJf//////////wIBAg==
-----END DH PARAMETERS-----' > /etc/openvpn/server/dh.pem
# Generate server.conf
- echo "port $PORT
-proto $PROTOCOL
+ echo "local $ip
+port $port
+proto $protocol
dev tun
-sndbuf 0
-rcvbuf 0
ca ca.crt
cert server.crt
key server.key
dh dh.pem
auth SHA512
-tls-auth ta.key 0
+tls-crypt tc.key
topology subnet
server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp.txt" > /etc/openvpn/server/server.conf
echo 'push "redirect-gateway def1 bypass-dhcp"' >> /etc/openvpn/server/server.conf
# DNS
- case $DNS in
- 1)
+ case "$dns" in
+ 1|"")
# Locate the proper resolv.conf
# Needed for systems running systemd-resolved
if grep -q "127.0.0.53" "/etc/resolv.conf"; then
- RESOLVCONF='/run/systemd/resolve/resolv.conf'
+ resolv_conf="/run/systemd/resolve/resolv.conf"
else
- RESOLVCONF='/etc/resolv.conf'
+ resolv_conf="/etc/resolv.conf"
fi
# Obtain the resolvers from resolv.conf and use them for OpenVPN
- grep -v '#' $RESOLVCONF | grep 'nameserver' | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | while read line; do
+ grep -v '#' "$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/server.conf
done
;;
@@ -323,12 +367,15 @@ ifconfig-pool-persist ipp.txt" > /etc/openvpn/server/server.conf
echo "keepalive 10 120
cipher AES-256-CBC
user nobody
-group $GROUPNAME
+group $group_name
persist-key
persist-tun
status openvpn-status.log
verb 3
crl-verify crl.pem" >> /etc/openvpn/server/server.conf
+ if [[ "$protocol" = "udp" ]]; then
+ echo "explicit-exit-notify" >> /etc/openvpn/server/server.conf
+ fi
# Enable net.ipv4.ip_forward for the system
echo 'net.ipv4.ip_forward=1' > /etc/sysctl.d/30-openvpn-forward.conf
# Enable without waiting for a reboot or service restart
@@ -338,25 +385,25 @@ crl-verify crl.pem" >> /etc/openvpn/server/server.conf
# reload.
# We don't use --add-service=openvpn because that would only work with
# the default port and protocol.
- firewall-cmd --add-port=$PORT/$PROTOCOL
+ firewall-cmd --add-port="$port"/"$protocol"
firewall-cmd --zone=trusted --add-source=10.8.0.0/24
- firewall-cmd --permanent --add-port=$PORT/$PROTOCOL
+ firewall-cmd --permanent --add-port="$port"/"$protocol"
firewall-cmd --permanent --zone=trusted --add-source=10.8.0.0/24
# Set NAT for the VPN subnet
- firewall-cmd --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
- firewall-cmd --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
+ firewall-cmd --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to "$ip"
+ firewall-cmd --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to "$ip"
else
# Create a service to set up persistent iptables rules
echo "[Unit]
Before=network.target
[Service]
Type=oneshot
-ExecStart=/sbin/iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
-ExecStart=/sbin/iptables -I INPUT -p $PROTOCOL --dport $PORT -j ACCEPT
+ExecStart=/sbin/iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $ip
+ExecStart=/sbin/iptables -I INPUT -p $protocol --dport $port -j ACCEPT
ExecStart=/sbin/iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
ExecStart=/sbin/iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
-ExecStop=/sbin/iptables -t nat -D POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
-ExecStop=/sbin/iptables -D INPUT -p $PROTOCOL --dport $PORT -j ACCEPT
+ExecStop=/sbin/iptables -t nat -D POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $ip
+ExecStop=/sbin/iptables -D INPUT -p $protocol --dport $port -j ACCEPT
ExecStop=/sbin/iptables -D FORWARD -s 10.8.0.0/24 -j ACCEPT
ExecStop=/sbin/iptables -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
RemainAfterExit=yes
@@ -365,7 +412,7 @@ WantedBy=multi-user.target" > /etc/systemd/system/openvpn-iptables.service
systemctl enable --now openvpn-iptables.service
fi
# If SELinux is enabled and a custom port was selected, we need this
- if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$PORT" != '1194' ]]; then
+ if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$port" != 1194 ]]; then
# Install semanage if not already present
if ! hash semanage 2>/dev/null; then
if grep -qs "CentOS Linux release 7" "/etc/centos-release"; then
@@ -374,21 +421,17 @@ WantedBy=multi-user.target" > /etc/systemd/system/openvpn-iptables.service
yum install policycoreutils-python-utils -y
fi
fi
- semanage port -a -t openvpn_port_t -p $PROTOCOL $PORT
+ semanage port -a -t openvpn_port_t -p "$protocol" "$port"
fi
- # And finally, enable and start the OpenVPN service
- systemctl enable --now openvpn-server@server.service
# If the server is behind a NAT, use the correct IP address
- if [[ "$PUBLICIP" != "" ]]; then
- IP=$PUBLICIP
+ if [[ "$public_ip" != "" ]]; then
+ ip="$public_ip"
fi
# client-common.txt is created so we have a template to add further users later
echo "client
dev tun
-proto $PROTOCOL
-sndbuf 0
-rcvbuf 0
-remote $IP $PORT
+proto $protocol
+remote $ip $port
resolv-retry infinite
nobind
persist-key
@@ -396,14 +439,16 @@ persist-tun
remote-cert-tls server
auth SHA512
cipher AES-256-CBC
-setenv opt block-outside-dns
-key-direction 1
+ignore-unknown-option block-outside-dns
+block-outside-dns
verb 3" > /etc/openvpn/server/client-common.txt
+ # Enable and start the OpenVPN service
+ systemctl enable --now openvpn-server@server.service
# Generates the custom client.ovpn
- newclient "$CLIENT"
+ new_client "$client"
echo
echo "Finished!"
echo
- echo "Your client configuration is available at:" ~/"$CLIENT.ovpn"
- echo "If you want to add more clients, you simply need to run this script again!"
+ echo "Your client configuration is available at:" ~/"$client.ovpn"
+ echo "If you want to add more clients, just run this script again!"
fi