diff --git a/README.md b/README.md
index abd0664..521d4c0 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,9 @@
-## openvpn-install
-OpenVPN [road warrior](http://en.wikipedia.org/wiki/Road_warrior_%28computing%29) installer for Debian, Ubuntu and CentOS.
+**New: [wireguard-install](https://github.com/Nyr/wireguard-install) is also available.**
-This script will let you setup your own VPN server in no more than a minute, even if you haven't used OpenVPN before. It has been designed to be as unobtrusive and universal as possible.
+## openvpn-install
+OpenVPN [road warrior](http://en.wikipedia.org/wiki/Road_warrior_%28computing%29) installer for Ubuntu, Debian, CentOS and Fedora.
+
+This script will let you set up your own VPN server in no more than a minute, even if you haven't used OpenVPN before. It has been designed to be as unobtrusive and universal as possible.
### Installation
Run the script and follow the assistant:
@@ -11,8 +13,8 @@ Run the script and follow the assistant:
Once it ends, you can run it again to add more users, remove some of them or even completely uninstall OpenVPN.
### I want to run my own VPN but don't have a server for that
-You can get a little VPS from just $1/month at [VirMach](https://billing.virmach.com/aff.php?aff=4109&url=billing.virmach.com/cart.php?gid=1).
+You can get a VPS from just $1/month at [VirMach](https://billing.virmach.com/aff.php?aff=4109&url=billing.virmach.com/cart.php?gid=18).
### Donations
-If you want to show your appreciation, you can donate via [PayPal](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=VBAYDL34Z7J6L) or [cryptocurrency](https://pastebin.com/raw/M2JJpQpC). Thanks!
\ No newline at end of file
+If you want to show your appreciation, you can donate via [PayPal](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=VBAYDL34Z7J6L) or [cryptocurrency](https://pastebin.com/raw/M2JJpQpC). Thanks!
diff --git a/openvpn-install.sh b/openvpn-install.sh
index 45ebe1b..1f0df4e 100644
--- a/openvpn-install.sh
+++ b/openvpn-install.sh
@@ -7,241 +7,247 @@
# Detect Debian users running the script with "sh" instead of bash
if readlink /proc/$$/exe | grep -q "dash"; then
- echo "This script needs to be run with bash, not sh"
+ echo 'This installer needs to be run with "bash", not "sh".'
+ exit
+fi
+
+# Discard stdin. Needed when running from an one-liner which includes a newline
+read -N 999999 -t 0.001
+
+# Detect OpenVZ 6
+if [[ $(uname -r | cut -d "." -f 1) -eq 2 ]]; then
+ echo "The system is running an old kernel, which is incompatible with this installer."
+ exit
+fi
+
+# Detect OS
+# $os_version variables aren't always in use, but are kept here for convenience
+if grep -qs "ubuntu" /etc/os-release; then
+ os="ubuntu"
+ os_version=$(grep 'VERSION_ID' /etc/os-release | cut -d '"' -f 2 | tr -d '.')
+ group_name="nogroup"
+elif [[ -e /etc/debian_version ]]; then
+ os="debian"
+ os_version=$(grep -oE '[0-9]+' /etc/debian_version | head -1)
+ group_name="nogroup"
+elif [[ -e /etc/centos-release ]]; then
+ os="centos"
+ os_version=$(grep -oE '[0-9]+' /etc/centos-release | head -1)
+ group_name="nobody"
+elif [[ -e /etc/fedora-release ]]; then
+ os="fedora"
+ os_version=$(grep -oE '[0-9]+' /etc/fedora-release | head -1)
+ group_name="nobody"
+else
+ echo "This installer seems to be running on an unsupported distribution.
+Supported distributions are Ubuntu, Debian, CentOS, and Fedora."
+ exit
+fi
+
+if [[ "$os" == "ubuntu" && "$os_version" -lt 1804 ]]; then
+ echo "Ubuntu 18.04 or higher is required to use this installer.
+This version of Ubuntu is too old and unsupported."
+ exit
+fi
+
+if [[ "$os" == "debian" && "$os_version" -lt 9 ]]; then
+ echo "Debian 9 or higher is required to use this installer.
+This version of Debian is too old and unsupported."
+ exit
+fi
+
+if [[ "$os" == "centos" && "$os_version" -lt 7 ]]; then
+ echo "CentOS 7 or higher is required to use this installer.
+This version of CentOS is too old and unsupported."
+ exit
+fi
+
+# Detect environments where $PATH does not include the sbin directories
+if ! grep -q sbin <<< "$PATH"; then
+ echo '$PATH does not include sbin. Try using "su -" instead of "su".'
exit
fi
if [[ "$EUID" -ne 0 ]]; then
- echo "Sorry, you need to run this as root"
+ echo "This installer needs to be run with superuser privileges."
exit
fi
-if [[ ! -e /dev/net/tun ]]; then
- echo "The TUN device is not available
-You need to enable TUN before running this script"
+if [[ ! -e /dev/net/tun ]] || ! ( exec 7<>/dev/net/tun ) 2>/dev/null; then
+ echo "The system does not have the TUN device available.
+TUN needs to be enabled before running this installer."
exit
fi
-if [[ -e /etc/debian_version ]]; then
- OS=debian
- GROUPNAME=nogroup
- RCLOCAL='/etc/rc.local'
-elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
- OS=centos
- GROUPNAME=nobody
- RCLOCAL='/etc/rc.d/rc.local'
-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/client-common.txt ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- cat /etc/openvpn/easy-rsa/pki/ca.crt >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- sed -ne '/BEGIN CERTIFICATE/,$ p' /etc/openvpn/easy-rsa/pki/issued/$1.crt >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- cat /etc/openvpn/easy-rsa/pki/private/$1.key >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- echo "" >> ~/$1.ovpn
- sed -ne '/BEGIN OpenVPN Static key/,$ p' /etc/openvpn/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/"$client".crt
+ echo ""
+ echo ""
+ cat /etc/openvpn/server/easy-rsa/pki/private/"$client".key
+ echo ""
+ echo ""
+ sed -ne '/BEGIN OpenVPN Static key/,$ p' /etc/openvpn/server/tc.key
+ echo ""
+ } > ~/"$client".ovpn
}
-if [[ -e /etc/openvpn/server.conf ]]; then
- while :
- do
+if [[ ! -e /etc/openvpn/server/server.conf ]]; then
clear
- echo "Looks like OpenVPN is already installed."
+ echo 'Welcome to this OpenVPN road warrior installer!'
+ # If system has a single IPv4, it is selected automatically. Else, ask the user
+ if [[ $(ip -4 addr | grep inet | grep -vEc '127(\.[0-9]{1,3}){3}') -eq 1 ]]; then
+ ip=$(ip -4 addr | grep inet | grep -vE '127(\.[0-9]{1,3}){3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}')
+ else
+ number_of_ip=$(ip -4 addr | grep inet | grep -vEc '127(\.[0-9]{1,3}){3}')
echo
- echo "What do you want to do?"
- echo " 1) Add a new user"
- echo " 2) Revoke an existing user"
- 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 certificate."
- echo "Please, use one word only, no special characters."
- read -p "Client name: " -e CLIENT
- cd /etc/openvpn/easy-rsa/
- EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-client-full $CLIENT nopass
- # Generates the custom client.ovpn
- newclient "$CLIENT"
- echo
- 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=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep -c "^V")
- if [[ "$NUMBEROFCLIENTS" = '0' ]]; then
- echo
- echo "You have no existing clients!"
- exit
- 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)
- echo
- read -p "Do you really want to revoke access for client $CLIENT? [y/N]: " -e REVOKE
- if [[ "$REVOKE" = 'y' || "$REVOKE" = 'Y' ]]; then
- cd /etc/openvpn/easy-rsa/
- ./easyrsa --batch revoke $CLIENT
- EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
- rm -f /etc/openvpn/crl.pem
- cp /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn/crl.pem
- # CRL is read with each client connection, when OpenVPN is dropped to nobody
- chown nobody:$GROUPNAME /etc/openvpn/crl.pem
- echo
- echo "Certificate for client $CLIENT revoked!"
- else
- echo
- 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.conf | cut -d " " -f 2)
- PROTOCOL=$(grep '^proto ' /etc/openvpn/server.conf | cut -d " " -f 2)
- if pgrep firewalld; then
- IP=$(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)
- # Using both permanent and not permanent rules to avoid a firewalld reload.
- firewall-cmd --zone=public --remove-port=$PORT/$PROTOCOL
- firewall-cmd --zone=trusted --remove-source=10.8.0.0/24
- firewall-cmd --permanent --zone=public --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 $IP
- else
- IP=$(grep 'iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to ' $RCLOCAL | cut -d " " -f 14)
- iptables -t nat -D POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
- sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 ! -d 10.8.0.0\/24 -j SNAT --to /d' $RCLOCAL
- if iptables -L -n | grep -qE '^ACCEPT'; then
- iptables -D INPUT -p $PROTOCOL --dport $PORT -j ACCEPT
- iptables -D FORWARD -s 10.8.0.0/24 -j ACCEPT
- iptables -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
- sed -i "/iptables -I INPUT -p $PROTOCOL --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" $RCLOCAL
- fi
- fi
- if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$PORT" != '1194' ]]; then
- semanage port -d -t openvpn_port_t -p $PROTOCOL $PORT
- fi
- if [[ "$OS" = 'debian' ]]; then
- apt-get remove --purge -y openvpn
- else
- yum remove openvpn -y
- fi
- rm -rf /etc/openvpn
- rm -f /etc/sysctl.d/30-openvpn-forward.conf
- echo
- echo "OpenVPN removed!"
- else
- echo
- echo "Removal aborted!"
- fi
- exit
- ;;
- 4) exit;;
- esac
- done
-else
- clear
- 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
- # 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
+ echo "Which IPv4 address should be used?"
+ ip -4 addr | grep inet | grep -vE '127(\.[0-9]{1,3}){3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | nl -s ') '
+ read -p "IPv4 address [1]: " ip_number
+ until [[ -z "$ip_number" || "$ip_number" =~ ^[0-9]+$ && "$ip_number" -le "$number_of_ip" ]]; do
+ echo "$ip_number: invalid selection."
+ read -p "IPv4 address [1]: " ip_number
+ done
+ [[ -z "$ip_number" ]] && ip_number="1"
+ ip=$(ip -4 addr | grep inet | grep -vE '127(\.[0-9]{1,3}){3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | sed -n "$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
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 and sanitize with grep
+ get_public_ip=$(grep -m 1 -oE '^[0-9]{1,3}(\.[0-9]{1,3}){3}$' <<< "$(wget -T 10 -t 1 -4qO- "http://ip1.dynupdate.no-ip.com/" || curl -m 10 -4Ls "http://ip1.dynupdate.no-ip.com/")")
+ read -p "Public IPv4 address / hostname [$get_public_ip]: " public_ip
+ # If the checkip service is unavailable and user didn't provide input, ask again
+ until [[ -n "$get_public_ip" || -n "$public_ip" ]]; do
+ echo "Invalid input."
+ read -p "Public IPv4 address / hostname: " public_ip
+ done
+ [[ -z "$public_ip" ]] && public_ip="$get_public_ip"
+ fi
+ # If system has a single IPv6, it is selected automatically
+ if [[ $(ip -6 addr | grep -c 'inet6 [23]') -eq 1 ]]; then
+ ip6=$(ip -6 addr | grep 'inet6 [23]' | cut -d '/' -f 1 | grep -oE '([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}')
+ fi
+ # If system has multiple IPv6, ask the user to select one
+ if [[ $(ip -6 addr | grep -c 'inet6 [23]') -gt 1 ]]; then
+ number_of_ip6=$(ip -6 addr | grep -c 'inet6 [23]')
+ echo
+ echo "Which IPv6 address should be used?"
+ ip -6 addr | grep 'inet6 [23]' | cut -d '/' -f 1 | grep -oE '([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}' | nl -s ') '
+ read -p "IPv6 address [1]: " ip6_number
+ until [[ -z "$ip6_number" || "$ip6_number" =~ ^[0-9]+$ && "$ip6_number" -le "$number_of_ip6" ]]; do
+ echo "$ip6_number: invalid selection."
+ read -p "IPv6 address [1]: " ip6_number
+ done
+ [[ -z "$ip6_number" ]] && ip6_number="1"
+ ip6=$(ip -6 addr | grep 'inet6 [23]' | cut -d '/' -f 1 | grep -oE '([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}' | sed -n "$ip6_number"p)
fi
echo
- echo "Which protocol do you want for OpenVPN connections?"
+ echo "Which protocol should OpenVPN use?"
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
+ echo "What port should OpenVPN listen to?"
+ read -p "Port [1194]: " port
+ until [[ -z "$port" || "$port" =~ ^[0-9]+$ && "$port" -le 65535 ]]; do
+ echo "$port: invalid port."
+ read -p "Port [1194]: " port
+ done
+ [[ -z "$port" ]] && port="1194"
echo
- echo "Which DNS do you want to use with the VPN?"
+ echo "Select a DNS server for the clients:"
echo " 1) Current system resolvers"
- echo " 2) 1.1.1.1"
- echo " 3) Google"
+ echo " 2) Google"
+ echo " 3) 1.1.1.1"
echo " 4) OpenDNS"
- echo " 5) Verisign"
- read -p "DNS [1-5]: " -e -i 1 DNS
+ echo " 5) Quad9"
+ echo " 6) AdGuard"
+ read -p "DNS server [1]: " dns
+ until [[ -z "$dns" || "$dns" =~ ^[1-6]$ ]]; do
+ echo "$dns: invalid selection."
+ read -p "DNS server [1]: " dns
+ done
echo
- echo "Finally, tell me your name for the client certificate."
- echo "Please, use one word only, no special characters."
- read -p "Client name: " -e -i client CLIENT
+ echo "Enter a name for the first client:"
+ read -p "Name [client]: " unsanitized_client
+ # Allow a limited set of characters to avoid conflicts
+ client=$(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."
+ echo "OpenVPN installation is ready to begin."
+ # Install a firewall in the rare case where one is not already available
+ if ! systemctl is-active --quiet firewalld.service && ! hash iptables 2>/dev/null; then
+ if [[ "$os" == "centos" || "$os" == "fedora" ]]; then
+ firewall="firewalld"
+ # We don't want to silently enable firewalld, so we give a subtle warning
+ # If the user continues, firewalld will be installed and enabled during setup
+ echo "firewalld, which is required to manage routing tables, will also be installed."
+ elif [[ "$os" == "debian" || "$os" == "ubuntu" ]]; then
+ # iptables is way less invasive than firewalld so no warning is given
+ firewall="iptables"
+ fi
+ fi
read -n1 -r -p "Press any key to continue..."
- if [[ "$OS" = 'debian' ]]; then
+ # If running inside a container, disable LimitNPROC to prevent conflicts
+ if systemd-detect-virt -cq; then
+ mkdir /etc/systemd/system/openvpn-server@server.service.d/ 2>/dev/null
+ echo "[Service]
+LimitNPROC=infinity" > /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
+ fi
+ if [[ "$os" = "debian" || "$os" = "ubuntu" ]]; then
apt-get update
- apt-get install openvpn iptables openssl ca-certificates -y
+ apt-get install -y openvpn openssl ca-certificates $firewall
+ elif [[ "$os" = "centos" ]]; then
+ yum install -y epel-release
+ yum install -y openvpn openssl ca-certificates tar $firewall
else
- # Else, the distro is CentOS
- yum install epel-release -y
- yum install openvpn iptables openssl ca-certificates -y
+ # Else, OS must be Fedora
+ dnf install -y openvpn openssl ca-certificates tar $firewall
+ fi
+ # If firewalld was just installed, enable it
+ if [[ "$firewall" == "firewalld" ]]; then
+ systemctl enable --now firewalld.service
fi
# Get easy-rsa
- EASYRSAURL='https://github.com/OpenVPN/easy-rsa/releases/download/v3.0.6/EasyRSA-unix-v3.0.6.tgz'
- wget -O ~/easyrsa.tgz "$EASYRSAURL" 2>/dev/null || curl -Lo ~/easyrsa.tgz "$EASYRSAURL"
- tar xzf ~/easyrsa.tgz -C ~/
- mv ~/EasyRSA-v3.0.6/ /etc/openvpn/
- mv /etc/openvpn/EasyRSA-v3.0.6/ /etc/openvpn/easy-rsa/
- chown -R root:root /etc/openvpn/easy-rsa/
- rm -f ~/easyrsa.tgz
- cd /etc/openvpn/easy-rsa/
+ easy_rsa_url='https://github.com/OpenVPN/easy-rsa/releases/download/v3.0.8/EasyRSA-3.0.8.tgz'
+ mkdir -p /etc/openvpn/server/easy-rsa/
+ { wget -qO- "$easy_rsa_url" 2>/dev/null || curl -sL "$easy_rsa_url" ; } | tar xz -C /etc/openvpn/server/easy-rsa/ --strip-components 1
+ chown -R root:root /etc/openvpn/server/easy-rsa/
+ cd /etc/openvpn/server/easy-rsa/
# Create the PKI, set up the CA and the server and client certificates
./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
- # CRL is read with each client connection, when OpenVPN is dropped to nobody
- chown nobody:$GROUPNAME /etc/openvpn/crl.pem
- # Generate key for tls-auth
- openvpn --genkey --secret /etc/openvpn/ta.key
+ cp pki/ca.crt pki/private/ca.key pki/issued/server.crt pki/private/server.key pki/crl.pem /etc/openvpn/server
+ # CRL is read with each client connection, while OpenVPN is dropped to nobody
+ chown nobody:"$group_name" /etc/openvpn/server/crl.pem
+ # Without +x in the directory, OpenVPN can't run a stat() on the CRL file
+ chmod o+x /etc/openvpn/server/
+ # 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
@@ -250,138 +256,160 @@ MIIBCAKCAQEA//////////+t+FRYortKmq/cViAnPTzx2LnFg84tNpWp4TZBFGQz
YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi
7MA0BM0oNC9hkXL+nOmFg/+OTxIy7vKBg8P+OxtMb61zO7X8vC7CIAXFjvGDfRaD
ssbzSibBsu/6iGtCOGEoXJf//////////wIBAg==
------END DH PARAMETERS-----' > /etc/openvpn/dh.pem
+-----END DH PARAMETERS-----' > /etc/openvpn/server/dh.pem
# Generate server.conf
- echo "port $PORT
-proto $PROTOCOL
+ echo "local $ip
+port $port
+proto $protocol
dev tun
-sndbuf 0
-rcvbuf 0
ca ca.crt
cert server.crt
key server.key
dh dh.pem
auth SHA512
-tls-auth ta.key 0
+tls-crypt tc.key
topology subnet
-server 10.8.0.0 255.255.255.0
-ifconfig-pool-persist ipp.txt" > /etc/openvpn/server.conf
- echo 'push "redirect-gateway def1 bypass-dhcp"' >> /etc/openvpn/server.conf
+server 10.8.0.0 255.255.255.0" > /etc/openvpn/server/server.conf
+ # IPv6
+ if [[ -z "$ip6" ]]; then
+ echo 'push "redirect-gateway def1 bypass-dhcp"' >> /etc/openvpn/server/server.conf
+ else
+ echo 'server-ipv6 fddd:1194:1194:1194::/64' >> /etc/openvpn/server/server.conf
+ echo 'push "redirect-gateway def1 ipv6 bypass-dhcp"' >> /etc/openvpn/server/server.conf
+ fi
+ echo 'ifconfig-pool-persist ipp.txt' >> /etc/openvpn/server/server.conf
# DNS
- 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'
- else
- RESOLVCONF='/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
- echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server.conf
- done
+ case "$dns" in
+ 1|"")
+ # Locate the proper resolv.conf
+ # Needed for systems running systemd-resolved
+ if grep -q '^nameserver 127.0.0.53' "/etc/resolv.conf"; then
+ resolv_conf="/run/systemd/resolve/resolv.conf"
+ else
+ resolv_conf="/etc/resolv.conf"
+ fi
+ # Obtain the resolvers from resolv.conf and use them for OpenVPN
+ grep -v '^#\|^;' "$resolv_conf" | grep '^nameserver' | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | while read line; do
+ echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server/server.conf
+ done
;;
2)
- echo 'push "dhcp-option DNS 1.1.1.1"' >> /etc/openvpn/server.conf
- echo 'push "dhcp-option DNS 1.0.0.1"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server/server.conf
+ echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server/server.conf
;;
3)
- 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
+ echo 'push "dhcp-option DNS 1.1.1.1"' >> /etc/openvpn/server/server.conf
+ echo 'push "dhcp-option DNS 1.0.0.1"' >> /etc/openvpn/server/server.conf
;;
4)
- 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
+ echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server/server.conf
+ echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server/server.conf
;;
5)
- echo 'push "dhcp-option DNS 64.6.64.6"' >> /etc/openvpn/server.conf
- echo 'push "dhcp-option DNS 64.6.65.6"' >> /etc/openvpn/server.conf
+ echo 'push "dhcp-option DNS 9.9.9.9"' >> /etc/openvpn/server/server.conf
+ echo 'push "dhcp-option DNS 149.112.112.112"' >> /etc/openvpn/server/server.conf
+ ;;
+ 6)
+ echo 'push "dhcp-option DNS 94.140.14.14"' >> /etc/openvpn/server/server.conf
+ echo 'push "dhcp-option DNS 94.140.15.15"' >> /etc/openvpn/server/server.conf
;;
esac
echo "keepalive 10 120
cipher AES-256-CBC
user nobody
-group $GROUPNAME
+group $group_name
persist-key
persist-tun
status openvpn-status.log
verb 3
-crl-verify crl.pem" >> /etc/openvpn/server.conf
+crl-verify crl.pem" >> /etc/openvpn/server/server.conf
+ if [[ "$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
echo 1 > /proc/sys/net/ipv4/ip_forward
- if pgrep firewalld; then
+ if [[ -n "$ip6" ]]; then
+ # Enable net.ipv6.conf.all.forwarding for the system
+ echo "net.ipv6.conf.all.forwarding=1" >> /etc/sysctl.d/30-openvpn-forward.conf
+ # Enable without waiting for a reboot or service restart
+ echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
+ fi
+ if systemctl is-active --quiet firewalld.service; then
# Using both permanent and not permanent rules to avoid a firewalld
# reload.
# We don't use --add-service=openvpn because that would only work with
# the default port and protocol.
- firewall-cmd --zone=public --add-port=$PORT/$PROTOCOL
+ firewall-cmd --add-port="$port"/"$protocol"
firewall-cmd --zone=trusted --add-source=10.8.0.0/24
- firewall-cmd --permanent --zone=public --add-port=$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 "$ip"
+ if [[ -n "$ip6" ]]; then
+ firewall-cmd --zone=trusted --add-source=fddd:1194:1194:1194::/64
+ firewall-cmd --permanent --zone=trusted --add-source=fddd:1194:1194:1194::/64
+ firewall-cmd --direct --add-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to "$ip6"
+ firewall-cmd --permanent --direct --add-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to "$ip6"
+ fi
else
- # Needed to use rc.local with some systemd distros
- if [[ "$OS" = 'debian' && ! -e $RCLOCAL ]]; then
- echo '#!/bin/sh -e
-exit 0' > $RCLOCAL
+ # Create a service to set up persistent iptables rules
+ iptables_path=$(command -v iptables)
+ ip6tables_path=$(command -v ip6tables)
+ # nf_tables is not available as standard in OVZ kernels. So use iptables-legacy
+ # if we are in OVZ, with a nf_tables backend and iptables-legacy is available.
+ if [[ $(systemd-detect-virt) == "openvz" ]] && readlink -f "$(command -v iptables)" | grep -q "nft" && hash iptables-legacy 2>/dev/null; then
+ iptables_path=$(command -v iptables-legacy)
+ ip6tables_path=$(command -v ip6tables-legacy)
fi
- chmod +x $RCLOCAL
- # Set NAT for the VPN subnet
- iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
- sed -i "1 a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP" $RCLOCAL
- if iptables -L -n | 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 $PROTOCOL --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 $PROTOCOL --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" $RCLOCAL
+ echo "[Unit]
+Before=network.target
+[Service]
+Type=oneshot
+ExecStart=$iptables_path -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $ip
+ExecStart=$iptables_path -I INPUT -p $protocol --dport $port -j ACCEPT
+ExecStart=$iptables_path -I FORWARD -s 10.8.0.0/24 -j ACCEPT
+ExecStart=$iptables_path -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
+ExecStop=$iptables_path -t nat -D POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $ip
+ExecStop=$iptables_path -D INPUT -p $protocol --dport $port -j ACCEPT
+ExecStop=$iptables_path -D FORWARD -s 10.8.0.0/24 -j ACCEPT
+ExecStop=$iptables_path -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" > /etc/systemd/system/openvpn-iptables.service
+ if [[ -n "$ip6" ]]; then
+ echo "ExecStart=$ip6tables_path -t nat -A POSTROUTING -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to $ip6
+ExecStart=$ip6tables_path -I FORWARD -s fddd:1194:1194:1194::/64 -j ACCEPT
+ExecStart=$ip6tables_path -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
+ExecStop=$ip6tables_path -t nat -D POSTROUTING -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to $ip6
+ExecStop=$ip6tables_path -D FORWARD -s fddd:1194:1194:1194::/64 -j ACCEPT
+ExecStop=$ip6tables_path -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" >> /etc/systemd/system/openvpn-iptables.service
fi
+ echo "RemainAfterExit=yes
+[Install]
+WantedBy=multi-user.target" >> /etc/systemd/system/openvpn-iptables.service
+ systemctl enable --now openvpn-iptables.service
fi
# If SELinux is enabled and a custom port was selected, we need this
- if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$PORT" != '1194' ]]; then
+ if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$port" != 1194 ]]; then
# Install semanage if not already present
if ! hash semanage 2>/dev/null; then
- yum install policycoreutils-python -y
+ if [[ "$os_version" -eq 7 ]]; then
+ # Centos 7
+ yum install -y policycoreutils-python
+ else
+ # CentOS 8 or Fedora
+ dnf install -y policycoreutils-python-utils
+ fi
fi
- semanage port -a -t openvpn_port_t -p $PROTOCOL $PORT
- fi
- # And finally, restart OpenVPN
- if [[ "$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
- # If the server is behind a NAT, use the correct IP address
- if [[ "$PUBLICIP" != "" ]]; then
- IP=$PUBLICIP
+ semanage port -a -t openvpn_port_t -p "$protocol" "$port"
fi
+ # If the server is behind NAT, use the correct IP address
+ [[ -n "$public_ip" ]] && ip="$public_ip"
# 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 $port
resolv-retry infinite
nobind
persist-key
@@ -389,14 +417,144 @@ persist-tun
remote-cert-tls server
auth SHA512
cipher AES-256-CBC
-setenv opt block-outside-dns
-key-direction 1
-verb 3" > /etc/openvpn/client-common.txt
+ignore-unknown-option block-outside-dns
+block-outside-dns
+verb 3" > /etc/openvpn/server/client-common.txt
+ # Enable and start the OpenVPN service
+ systemctl enable --now openvpn-server@server.service
# Generates the custom client.ovpn
- newclient "$CLIENT"
+ new_client
echo
echo "Finished!"
echo
- echo "Your client configuration is available at:" ~/"$CLIENT.ovpn"
- echo "If you want to add more clients, you simply need to run this script again!"
+ echo "The client configuration is available in:" ~/"$client.ovpn"
+ echo "New clients can be added by running this script again."
+else
+ clear
+ echo "OpenVPN is already installed."
+ echo
+ echo "Select an option:"
+ echo " 1) Add a new client"
+ echo " 2) Revoke an existing client"
+ echo " 3) Remove OpenVPN"
+ echo " 4) Exit"
+ read -p "Option: " option
+ until [[ "$option" =~ ^[1-4]$ ]]; do
+ echo "$option: invalid selection."
+ read -p "Option: " option
+ done
+ case "$option" in
+ 1)
+ echo
+ echo "Provide a name for the client:"
+ read -p "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 "$client: invalid name."
+ read -p "Name: " unsanitized_client
+ client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
+ done
+ cd /etc/openvpn/server/easy-rsa/
+ EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-client-full "$client" nopass
+ # Generates the custom client.ovpn
+ new_client
+ echo
+ echo "$client added. Configuration available in:" ~/"$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
+ 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 "There are no existing clients!"
+ exit
+ fi
+ echo
+ echo "Select the client to revoke:"
+ tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
+ read -p "Client: " client_number
+ until [[ "$client_number" =~ ^[0-9]+$ && "$client_number" -le "$number_of_clients" ]]; do
+ echo "$client_number: invalid selection."
+ read -p "Client: " client_number
+ done
+ client=$(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 "Confirm $client revocation? [y/N]: " revoke
+ until [[ "$revoke" =~ ^[yYnN]*$ ]]; do
+ echo "$revoke: invalid selection."
+ read -p "Confirm $client revocation? [y/N]: " revoke
+ done
+ if [[ "$revoke" =~ ^[yY]$ ]]; then
+ cd /etc/openvpn/server/easy-rsa/
+ ./easyrsa --batch revoke "$client"
+ EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
+ rm -f /etc/openvpn/server/crl.pem
+ cp /etc/openvpn/server/easy-rsa/pki/crl.pem /etc/openvpn/server/crl.pem
+ # CRL is read with each client connection, when OpenVPN is dropped to nobody
+ chown nobody:"$group_name" /etc/openvpn/server/crl.pem
+ echo
+ echo "$client revoked!"
+ else
+ echo
+ echo "$client revocation aborted!"
+ fi
+ exit
+ ;;
+ 3)
+ echo
+ read -p "Confirm OpenVPN removal? [y/N]: " remove
+ until [[ "$remove" =~ ^[yYnN]*$ ]]; do
+ echo "$remove: invalid selection."
+ read -p "Confirm OpenVPN removal? [y/N]: " remove
+ done
+ if [[ "$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 systemctl is-active --quiet firewalld.service; then
+ ip=$(firewall-cmd --direct --get-rules ipv4 nat POSTROUTING | grep '\-s 10.8.0.0/24 '"'"'!'"'"' -d 10.8.0.0/24' | grep -oE '[^ ]+$')
+ # Using both permanent and not permanent rules to avoid a firewalld reload.
+ 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 --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"
+ if grep -qs "server-ipv6" /etc/openvpn/server/server.conf; then
+ ip6=$(firewall-cmd --direct --get-rules ipv6 nat POSTROUTING | grep '\-s fddd:1194:1194:1194::/64 '"'"'!'"'"' -d fddd:1194:1194:1194::/64' | grep -oE '[^ ]+$')
+ firewall-cmd --zone=trusted --remove-source=fddd:1194:1194:1194::/64
+ firewall-cmd --permanent --zone=trusted --remove-source=fddd:1194:1194:1194::/64
+ firewall-cmd --direct --remove-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to "$ip6"
+ firewall-cmd --permanent --direct --remove-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to "$ip6"
+ fi
+ 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" "$port"
+ fi
+ systemctl disable --now openvpn-server@server.service
+ rm -rf /etc/openvpn/server
+ rm -f /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
+ rm -f /etc/sysctl.d/30-openvpn-forward.conf
+ if [[ "$os" = "debian" || "$os" = "ubuntu" ]]; then
+ apt-get remove --purge -y openvpn
+ else
+ # Else, OS must be CentOS or Fedora
+ yum remove -y openvpn
+ fi
+ echo
+ echo "OpenVPN removed!"
+ else
+ echo
+ echo "OpenVPN removal aborted!"
+ fi
+ exit
+ ;;
+ 4)
+ exit
+ ;;
+ esac
fi