From 83c29825f9e513cfadd482bc2207157ebbcccaaa Mon Sep 17 00:00:00 2001
From: Evan Chen <evan.yf.chen@ibm.com>
Date: Mon, 27 Sep 2021 11:35:43 +0800
Subject: [PATCH] feat: add vpn server setup scripts

---
 {m3u8下載 => Scripts/m3u8下載}/dl.sh   |   0
 {m3u8下載 => Scripts/m3u8下載}/test.sh |   0
 Scripts/vpn/openvpn-install.sh         | 567 ++++++++++++++++++++
 Scripts/vpn/wireguard-install.sh       | 692 +++++++++++++++++++++++++
 4 files changed, 1259 insertions(+)
 rename {m3u8下載 => Scripts/m3u8下載}/dl.sh (100%)
 rename {m3u8下載 => Scripts/m3u8下載}/test.sh (100%)
 create mode 100644 Scripts/vpn/openvpn-install.sh
 create mode 100644 Scripts/vpn/wireguard-install.sh

diff --git a/m3u8下載/dl.sh b/Scripts/m3u8下載/dl.sh
similarity index 100%
rename from m3u8下載/dl.sh
rename to Scripts/m3u8下載/dl.sh
diff --git a/m3u8下載/test.sh b/Scripts/m3u8下載/test.sh
similarity index 100%
rename from m3u8下載/test.sh
rename to Scripts/m3u8下載/test.sh
diff --git a/Scripts/vpn/openvpn-install.sh b/Scripts/vpn/openvpn-install.sh
new file mode 100644
index 0000000..b39e795
--- /dev/null
+++ b/Scripts/vpn/openvpn-install.sh
@@ -0,0 +1,567 @@
+#!/bin/bash
+#
+# https://github.com/Nyr/openvpn-install
+#
+# Copyright (c) 2013 Nyr. Released under the MIT License.
+
+
+# Detect Debian users running the script with "sh" instead of bash
+if readlink /proc/$$/exe | grep -q "dash"; then
+	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/almalinux-release || -e /etc/rocky-release || -e /etc/centos-release ]]; then
+	os="centos"
+	os_version=$(grep -shoE '[0-9]+' /etc/almalinux-release /etc/rocky-release /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 distros are Ubuntu, Debian, AlmaLinux, Rocky Linux, 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 "This installer needs to be run with superuser privileges."
+	exit
+fi
+
+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
+
+new_client () {
+	# Generates the custom client.ovpn
+	{
+	cat /etc/openvpn/server/client-common.txt
+	echo "<ca>"
+	cat /etc/openvpn/server/easy-rsa/pki/ca.crt
+	echo "</ca>"
+	echo "<cert>"
+	sed -ne '/BEGIN CERTIFICATE/,$ p' /etc/openvpn/server/easy-rsa/pki/issued/"$client".crt
+	echo "</cert>"
+	echo "<key>"
+	cat /etc/openvpn/server/easy-rsa/pki/private/"$client".key
+	echo "</key>"
+	echo "<tls-crypt>"
+	sed -ne '/BEGIN OpenVPN Static key/,$ p' /etc/openvpn/server/tc.key
+	echo "</tls-crypt>"
+	} > ~/"$client".ovpn
+}
+
+if [[ ! -e /etc/openvpn/server/server.conf ]]; then
+	# Detect some Debian minimal setups where neither wget nor curl are installed
+	if ! hash wget 2>/dev/null && ! hash curl 2>/dev/null; then
+		echo "Wget is required to use this installer."
+		read -n1 -r -p "Press any key to install Wget and continue..."
+		apt-get update
+		apt-get install -y wget
+	fi
+	clear
+	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 "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?"
+		# 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 should OpenVPN use?"
+	echo "   1) UDP (recommended)"
+	echo "   2) TCP"
+	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
+		;;
+	esac
+	echo
+	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 "Select a DNS server for the clients:"
+	echo "   1) Current system resolvers"
+	echo "   2) Google"
+	echo "   3) 1.1.1.1"
+	echo "   4) OpenDNS"
+	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 "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 "OpenVPN installation is ready to begin."
+	# Install a firewall if firewalld or iptables are 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 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 -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, 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
+	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_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, 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
++8yTnc4kmz75fS/jY2MMddj2gbICrsRhetPfHtXV/WVhJDP1H18GbtCFY2VVPe0a
+87VXE15/V8k1mE8McODmi3fipona8+/och3xWKE2rec1MKzKT0g6eXq8CrGCsyT7
+YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi
+7MA0BM0oNC9hkXL+nOmFg/+OTxIy7vKBg8P+OxtMb61zO7X8vC7CIAXFjvGDfRaD
+ssbzSibBsu/6iGtCOGEoXJf//////////wIBAg==
+-----END DH PARAMETERS-----' > /etc/openvpn/server/dh.pem
+	# Generate server.conf
+	echo "local $ip
+port $port
+proto $protocol
+dev tun
+ca ca.crt
+cert server.crt
+key server.key
+dh dh.pem
+auth SHA512
+tls-crypt tc.key
+topology subnet
+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 '^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 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 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/server.conf
+			echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server/server.conf
+		;;
+		5)
+			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 $group_name
+persist-key
+persist-tun
+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/99-openvpn-forward.conf
+	# Enable without waiting for a reboot or service restart
+	echo 1 > /proc/sys/net/ipv4/ip_forward
+	if [[ -n "$ip6" ]]; then
+		# Enable net.ipv6.conf.all.forwarding for the system
+		echo "net.ipv6.conf.all.forwarding=1" >> /etc/sysctl.d/99-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 --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 --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"
+		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
+		# 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
+		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
+		# Install semanage if not already present
+		if ! hash semanage 2>/dev/null; then
+			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
+	# 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
+remote $ip $port
+resolv-retry infinite
+nobind
+persist-key
+persist-tun
+remote-cert-tls server
+auth SHA512
+cipher AES-256-CBC
+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
+	new_client
+	echo
+	echo "Finished!"
+	echo
+	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 -f /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
+				rm -f /etc/sysctl.d/99-openvpn-forward.conf
+				if [[ "$os" = "debian" || "$os" = "ubuntu" ]]; then
+					rm -rf /etc/openvpn/server
+					apt-get remove --purge -y openvpn
+				else
+					# Else, OS must be CentOS or Fedora
+					yum remove -y openvpn
+					rm -rf /etc/openvpn/server
+				fi
+				echo
+				echo "OpenVPN removed!"
+			else
+				echo
+				echo "OpenVPN removal aborted!"
+			fi
+			exit
+		;;
+		4)
+			exit
+		;;
+	esac
+fi
diff --git a/Scripts/vpn/wireguard-install.sh b/Scripts/vpn/wireguard-install.sh
new file mode 100644
index 0000000..53bcb29
--- /dev/null
+++ b/Scripts/vpn/wireguard-install.sh
@@ -0,0 +1,692 @@
+#!/bin/bash
+#
+# https://github.com/Nyr/wireguard-install
+#
+# Copyright (c) 2020 Nyr. Released under the MIT License.
+
+
+# Detect Debian users running the script with "sh" instead of bash
+if readlink /proc/$$/exe | grep -q "dash"; then
+	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 '.')
+elif [[ -e /etc/debian_version ]]; then
+	os="debian"
+	os_version=$(grep -oE '[0-9]+' /etc/debian_version | head -1)
+elif [[ -e /etc/almalinux-release || -e /etc/rocky-release || -e /etc/centos-release ]]; then
+	os="centos"
+	os_version=$(grep -shoE '[0-9]+' /etc/almalinux-release /etc/rocky-release /etc/centos-release | head -1)
+elif [[ -e /etc/fedora-release ]]; then
+	os="fedora"
+	os_version=$(grep -oE '[0-9]+' /etc/fedora-release | head -1)
+else
+	echo "This installer seems to be running on an unsupported distribution.
+Supported distros are Ubuntu, Debian, AlmaLinux, Rocky Linux, CentOS and Fedora."
+	exit
+fi
+
+if [[ "$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" && "$os_version" -lt 10 ]]; then
+	echo "Debian 10 or higher is required to use this installer.
+This version of Debian is too old and unsupported."
+	exit
+fi
+
+if [[ "$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 '$PATH does not include sbin. Try using "su -" instead of "su".'
+	exit
+fi
+
+systemd-detect-virt -cq
+is_container="$?"
+
+if [[ "$os" == "fedora" && "$os_version" -eq 31 && $(uname -r | cut -d "." -f 2) -lt 6 && ! "$is_container" -eq 0 ]]; then
+	echo 'Fedora 31 is supported, but the kernel is outdated.
+Upgrade the kernel using "dnf upgrade kernel" and restart.'
+	exit
+fi
+
+if [[ "$EUID" -ne 0 ]]; then
+	echo "This installer needs to be run with superuser privileges."
+	exit
+fi
+
+if [[ "$is_container" -eq 0 ]]; then
+	if [ "$(uname -m)" != "x86_64" ]; then
+		echo "In containerized systems, this installer supports only the x86_64 architecture.
+The system runs on $(uname -m) and is unsupported."
+		exit
+	fi
+	# TUN device is required to use BoringTun if running inside a container
+	if [[ ! -e /dev/net/tun ]] || ! ( exec 7<>/dev/net/tun ) 2>/dev/null; then
+		echo "The system does not have the TUN device available.
+TUN needs to be enabled before running this installer."
+		exit
+	fi
+fi
+
+new_client_dns () {
+	echo "Select a DNS server for the client:"
+	echo "   1) Current system resolvers"
+	echo "   2) Google"
+	echo "   3) 1.1.1.1"
+	echo "   4) OpenDNS"
+	echo "   5) Quad9"
+	echo "   6) AdGuard"
+	read -p "DNS server [1]: " dns
+	until [[ -z "$dns" || "$dns" =~ ^[1-6]$ ]]; do
+		echo "$dns: invalid selection."
+		read -p "DNS server [1]: " dns
+	done
+		# DNS
+	case "$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
+			# Extract nameservers and provide them in the required format
+			dns=$(grep -v '^#\|^;' "$resolv_conf" | grep '^nameserver' | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | xargs | sed -e 's/ /, /g')
+		;;
+		2)
+			dns="8.8.8.8, 8.8.4.4"
+		;;
+		3)
+			dns="1.1.1.1, 1.0.0.1"
+		;;
+		4)
+			dns="208.67.222.222, 208.67.220.220"
+		;;
+		5)
+			dns="9.9.9.9, 149.112.112.112"
+		;;
+		6)
+			dns="94.140.14.14, 94.140.15.15"
+		;;
+	esac
+}
+
+new_client_setup () {
+	# Given a list of the assigned internal IPv4 addresses, obtain the lowest still
+	# available octet. Important to start looking at 2, because 1 is our gateway.
+	octet=2
+	while grep AllowedIPs /etc/wireguard/wg0.conf | cut -d "." -f 4 | cut -d "/" -f 1 | grep -q "$octet"; do
+		(( octet++ ))
+	done
+	# Don't break the WireGuard configuration in case the address space is full
+	if [[ "$octet" -eq 255 ]]; then
+		echo "253 clients are already configured. The WireGuard internal subnet is full!"
+		exit
+	fi
+	key=$(wg genkey)
+	psk=$(wg genpsk)
+	# Configure client in the server
+	cat << EOF >> /etc/wireguard/wg0.conf
+# BEGIN_PEER $client
+[Peer]
+PublicKey = $(wg pubkey <<< $key)
+PresharedKey = $psk
+AllowedIPs = 10.7.0.$octet/32$(grep -q 'fddd:2c4:2c4:2c4::1' /etc/wireguard/wg0.conf && echo ", fddd:2c4:2c4:2c4::$octet/128")
+# END_PEER $client
+EOF
+	# Create client configuration
+	cat << EOF > ~/"$client".conf
+[Interface]
+Address = 10.7.0.$octet/24$(grep -q 'fddd:2c4:2c4:2c4::1' /etc/wireguard/wg0.conf && echo ", fddd:2c4:2c4:2c4::$octet/64")
+DNS = $dns
+PrivateKey = $key
+
+[Peer]
+PublicKey = $(grep PrivateKey /etc/wireguard/wg0.conf | cut -d " " -f 3 | wg pubkey)
+PresharedKey = $psk
+AllowedIPs = 0.0.0.0/0, ::/0
+Endpoint = $(grep '^# ENDPOINT' /etc/wireguard/wg0.conf | cut -d " " -f 3):$(grep ListenPort /etc/wireguard/wg0.conf | cut -d " " -f 3)
+PersistentKeepalive = 25
+EOF
+}
+
+if [[ ! -e /etc/wireguard/wg0.conf ]]; then
+	# Detect some Debian minimal setups where neither wget nor curl are installed
+	if ! hash wget 2>/dev/null && ! hash curl 2>/dev/null; then
+		echo "Wget is required to use this installer."
+		read -n1 -r -p "Press any key to install Wget and continue..."
+		apt-get update
+		apt-get install -y wget
+	fi
+	clear
+	echo 'Welcome to this WireGuard 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=$(ip -4 addr | grep inet | grep -vEc '127(\.[0-9]{1,3}){3}')
+		echo
+		echo "Which IPv4 address should be used?"
+		ip -4 addr | grep inet | grep -vE '127(\.[0-9]{1,3}){3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | nl -s ') '
+		read -p "IPv4 address [1]: " ip_number
+		until [[ -z "$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?"
+		# 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 "What port should WireGuard listen to?"
+	read -p "Port [51820]: " port
+	until [[ -z "$port" || "$port" =~ ^[0-9]+$ && "$port" -le 65535 ]]; do
+		echo "$port: invalid port."
+		read -p "Port [51820]: " port
+	done
+	[[ -z "$port" ]] && port="51820"
+	echo
+	echo "Enter a name for the first client:"
+	read -p "Name [client]: " unsanitized_client
+	# Allow a limited set of characters to avoid conflicts
+	client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
+	[[ -z "$client" ]] && client="client"
+	echo
+	new_client_dns
+	# Set up automatic updates for BoringTun if the user is fine with that
+	if [[ "$is_container" -eq 0 ]]; then
+		echo
+		echo "BoringTun will be installed to set up WireGuard in the system."
+		read -p "Should automatic updates be enabled for it? [Y/n]: " boringtun_updates
+		until [[ "$boringtun_updates" =~ ^[yYnN]*$ ]]; do
+			echo "$remove: invalid selection."
+			read -p "Should automatic updates be enabled for it? [Y/n]: " boringtun_updates
+		done
+		[[ -z "$boringtun_updates" ]] && boringtun_updates="y"
+		if [[ "$boringtun_updates" =~ ^[yY]$ ]]; then
+			if [[ "$os" == "centos" || "$os" == "fedora" ]]; then
+				cron="cronie"
+			elif [[ "$os" == "debian" || "$os" == "ubuntu" ]]; then
+				cron="cron"
+			fi
+		fi
+	fi
+	echo
+	echo "WireGuard installation is ready to begin."
+	# Install a firewall if firewalld or iptables are 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..."
+	# Install WireGuard
+	# If not running inside a container, set up the WireGuard kernel module
+	if [[ ! "$is_container" -eq 0 ]]; then
+		if [[ "$os" == "ubuntu" ]]; then
+			# Ubuntu
+			apt-get update
+			apt-get install -y wireguard qrencode $firewall
+		elif [[ "$os" == "debian" && "$os_version" -ge 11 ]]; then
+			# Debian 11 or higher
+			apt-get update
+			apt-get install -y wireguard qrencode $firewall
+		elif [[ "$os" == "debian" && "$os_version" -eq 10 ]]; then
+			# Debian 10
+			if ! grep -qs '^deb .* buster-backports main' /etc/apt/sources.list /etc/apt/sources.list.d/*.list; then
+				echo "deb http://deb.debian.org/debian buster-backports main" >> /etc/apt/sources.list
+			fi
+			apt-get update
+			# Try to install kernel headers for the running kernel and avoid a reboot. This
+			# can fail, so it's important to run separately from the other apt-get command.
+			apt-get install -y linux-headers-"$(uname -r)"
+			# There are cleaner ways to find out the $architecture, but we require an
+			# specific format for the package name and this approach provides what we need.
+			architecture=$(dpkg --get-selections 'linux-image-*-*' | cut -f 1 | grep -oE '[^-]*$' -m 1)
+			# linux-headers-$architecture points to the latest headers. We install it
+			# because if the system has an outdated kernel, there is no guarantee that old
+			# headers were still downloadable and to provide suitable headers for future
+			# kernel updates.
+			apt-get install -y linux-headers-"$architecture"
+			apt-get install -y wireguard qrencode $firewall
+		elif [[ "$os" == "centos" && "$os_version" -eq 8 ]]; then
+			# CentOS 8
+			dnf install -y epel-release elrepo-release
+			dnf install -y kmod-wireguard wireguard-tools qrencode $firewall
+			mkdir -p /etc/wireguard/
+		elif [[ "$os" == "centos" && "$os_version" -eq 7 ]]; then
+			# CentOS 7
+			yum install -y epel-release https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm
+			yum install -y yum-plugin-elrepo
+			yum install -y kmod-wireguard wireguard-tools qrencode $firewall
+			mkdir -p /etc/wireguard/
+		elif [[ "$os" == "fedora" ]]; then
+			# Fedora
+			dnf install -y wireguard-tools qrencode $firewall
+			mkdir -p /etc/wireguard/
+		fi
+	# Else, we are inside a container and BoringTun needs to be used
+	else
+		# Install required packages
+		if [[ "$os" == "ubuntu" ]]; then
+			# Ubuntu
+			apt-get update
+			apt-get install -y qrencode ca-certificates $cron $firewall
+			apt-get install -y wireguard-tools --no-install-recommends
+		elif [[ "$os" == "debian" && "$os_version" -ge 11 ]]; then
+			# Debian 11 or higher
+			apt-get update
+			apt-get install -y qrencode ca-certificates $cron $firewall
+			apt-get install -y wireguard-tools --no-install-recommends
+		elif [[ "$os" == "debian" && "$os_version" -eq 10 ]]; then
+			# Debian 10
+			if ! grep -qs '^deb .* buster-backports main' /etc/apt/sources.list /etc/apt/sources.list.d/*.list; then
+				echo "deb http://deb.debian.org/debian buster-backports main" >> /etc/apt/sources.list
+			fi
+			apt-get update
+			apt-get install -y qrencode ca-certificates $cron $firewall
+			apt-get install -y wireguard-tools --no-install-recommends
+		elif [[ "$os" == "centos" && "$os_version" -eq 8 ]]; then
+			# CentOS 8
+			dnf install -y epel-release
+			dnf install -y wireguard-tools qrencode ca-certificates tar $cron $firewall
+			mkdir -p /etc/wireguard/
+		elif [[ "$os" == "centos" && "$os_version" -eq 7 ]]; then
+			# CentOS 7
+			yum install -y epel-release
+			yum install -y wireguard-tools qrencode ca-certificates tar $cron $firewall
+			mkdir -p /etc/wireguard/
+		elif [[ "$os" == "fedora" ]]; then
+			# Fedora
+			dnf install -y wireguard-tools qrencode ca-certificates tar $cron $firewall
+			mkdir -p /etc/wireguard/
+		fi
+		# Grab the BoringTun binary using wget or curl and extract into the right place.
+		# Don't use this service elsewhere without permission! Contact me before you do!
+		{ wget -qO- https://wg.nyr.be/1/latest/download 2>/dev/null || curl -sL https://wg.nyr.be/1/latest/download ; } | tar xz -C /usr/local/sbin/ --wildcards 'boringtun-*/boringtun' --strip-components 1
+		# Configure wg-quick to use BoringTun
+		mkdir /etc/systemd/system/wg-quick@wg0.service.d/ 2>/dev/null
+		echo "[Service]
+Environment=WG_QUICK_USERSPACE_IMPLEMENTATION=boringtun
+Environment=WG_SUDO=1" > /etc/systemd/system/wg-quick@wg0.service.d/boringtun.conf
+		if [[ -n "$cron" ]] && [[ "$os" == "centos" || "$os" == "fedora" ]]; then
+			systemctl enable --now crond.service
+		fi
+	fi
+	# If firewalld was just installed, enable it
+	if [[ "$firewall" == "firewalld" ]]; then
+		systemctl enable --now firewalld.service
+	fi
+	# Generate wg0.conf
+	cat << EOF > /etc/wireguard/wg0.conf
+# Do not alter the commented lines
+# They are used by wireguard-install
+# ENDPOINT $([[ -n "$public_ip" ]] && echo "$public_ip" || echo "$ip")
+
+[Interface]
+Address = 10.7.0.1/24$([[ -n "$ip6" ]] && echo ", fddd:2c4:2c4:2c4::1/64")
+PrivateKey = $(wg genkey)
+ListenPort = $port
+
+EOF
+	chmod 600 /etc/wireguard/wg0.conf
+	# Enable net.ipv4.ip_forward for the system
+	echo 'net.ipv4.ip_forward=1' > /etc/sysctl.d/99-wireguard-forward.conf
+	# Enable without waiting for a reboot or service restart
+	echo 1 > /proc/sys/net/ipv4/ip_forward
+	if [[ -n "$ip6" ]]; then
+		# Enable net.ipv6.conf.all.forwarding for the system
+		echo "net.ipv6.conf.all.forwarding=1" >> /etc/sysctl.d/99-wireguard-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.
+		firewall-cmd --add-port="$port"/udp
+		firewall-cmd --zone=trusted --add-source=10.7.0.0/24
+		firewall-cmd --permanent --add-port="$port"/udp
+		firewall-cmd --permanent --zone=trusted --add-source=10.7.0.0/24
+		# Set NAT for the VPN subnet
+		firewall-cmd --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.7.0.0/24 ! -d 10.7.0.0/24 -j SNAT --to "$ip"
+		firewall-cmd --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.7.0.0/24 ! -d 10.7.0.0/24 -j SNAT --to "$ip"
+		if [[ -n "$ip6" ]]; then
+			firewall-cmd --zone=trusted --add-source=fddd:2c4:2c4:2c4::/64
+			firewall-cmd --permanent --zone=trusted --add-source=fddd:2c4:2c4:2c4::/64
+			firewall-cmd --direct --add-rule ipv6 nat POSTROUTING 0 -s fddd:2c4:2c4:2c4::/64 ! -d fddd:2c4:2c4:2c4::/64 -j SNAT --to "$ip6"
+			firewall-cmd --permanent --direct --add-rule ipv6 nat POSTROUTING 0 -s fddd:2c4:2c4:2c4::/64 ! -d fddd:2c4:2c4:2c4::/64 -j SNAT --to "$ip6"
+		fi
+	else
+		# Create a service to set up persistent iptables rules
+		iptables_path=$(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
+		echo "[Unit]
+Before=network.target
+[Service]
+Type=oneshot
+ExecStart=$iptables_path -t nat -A POSTROUTING -s 10.7.0.0/24 ! -d 10.7.0.0/24 -j SNAT --to $ip
+ExecStart=$iptables_path -I INPUT -p udp --dport $port -j ACCEPT
+ExecStart=$iptables_path -I FORWARD -s 10.7.0.0/24 -j ACCEPT
+ExecStart=$iptables_path -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
+ExecStop=$iptables_path -t nat -D POSTROUTING -s 10.7.0.0/24 ! -d 10.7.0.0/24 -j SNAT --to $ip
+ExecStop=$iptables_path -D INPUT -p udp --dport $port -j ACCEPT
+ExecStop=$iptables_path -D FORWARD -s 10.7.0.0/24 -j ACCEPT
+ExecStop=$iptables_path -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" > /etc/systemd/system/wg-iptables.service
+		if [[ -n "$ip6" ]]; then
+			echo "ExecStart=$ip6tables_path -t nat -A POSTROUTING -s fddd:2c4:2c4:2c4::/64 ! -d fddd:2c4:2c4:2c4::/64 -j SNAT --to $ip6
+ExecStart=$ip6tables_path -I FORWARD -s fddd:2c4:2c4:2c4::/64 -j ACCEPT
+ExecStart=$ip6tables_path -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
+ExecStop=$ip6tables_path -t nat -D POSTROUTING -s fddd:2c4:2c4:2c4::/64 ! -d fddd:2c4:2c4:2c4::/64 -j SNAT --to $ip6
+ExecStop=$ip6tables_path -D FORWARD -s fddd:2c4:2c4:2c4::/64 -j ACCEPT
+ExecStop=$ip6tables_path -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" >> /etc/systemd/system/wg-iptables.service
+		fi
+		echo "RemainAfterExit=yes
+[Install]
+WantedBy=multi-user.target" >> /etc/systemd/system/wg-iptables.service
+		systemctl enable --now wg-iptables.service
+	fi
+	# Generates the custom client.conf
+	new_client_setup
+	# Enable and start the wg-quick service
+	systemctl enable --now wg-quick@wg0.service
+	# Set up automatic updates for BoringTun if the user wanted to
+	if [[ "$boringtun_updates" =~ ^[yY]$ ]]; then
+		# Deploy upgrade script
+		cat << 'EOF' > /usr/local/sbin/boringtun-upgrade
+#!/bin/bash
+latest=$(wget -qO- https://wg.nyr.be/1/latest 2>/dev/null || curl -sL https://wg.nyr.be/1/latest 2>/dev/null)
+# If server did not provide an appropriate response, exit
+if ! head -1 <<< "$latest" | grep -qiE "^boringtun.+[0-9]+\.[0-9]+.*$"; then
+	echo "Update server unavailable"
+	exit
+fi
+current=$(boringtun -V)
+if [[ "$current" != "$latest" ]]; then
+	download="https://wg.nyr.be/1/latest/download"
+	xdir=$(mktemp -d)
+	# If download and extraction are successful, upgrade the boringtun binary
+	if { wget -qO- "$download" 2>/dev/null || curl -sL "$download" ; } | tar xz -C "$xdir" --wildcards "boringtun-*/boringtun" --strip-components 1; then
+		systemctl stop wg-quick@wg0.service
+		rm -f /usr/local/sbin/boringtun
+		mv "$xdir"/boringtun /usr/local/sbin/boringtun
+		systemctl start wg-quick@wg0.service
+		echo "Succesfully updated to $(boringtun -V)"
+	else
+		echo "boringtun update failed"
+	fi
+	rm -rf "$xdir"
+else
+	echo "$current is up to date"
+fi
+EOF
+		chmod +x /usr/local/sbin/boringtun-upgrade
+		# Add cron job to run the updater daily at a random time between 3:00 and 5:59
+		{ crontab -l 2>/dev/null; echo "$(( $RANDOM % 60 )) $(( $RANDOM % 3 + 3 )) * * * /usr/local/sbin/boringtun-upgrade &>/dev/null" ; } | crontab -
+	fi
+	echo
+	qrencode -t UTF8 < ~/"$client.conf"
+	echo -e '\xE2\x86\x91 That is a QR code containing the client configuration.'
+	echo
+	# If the kernel module didn't load, system probably had an outdated kernel
+	# We'll try to help, but will not will not force a kernel upgrade upon the user
+	if [[ ! "$is_container" -eq 0 ]] && ! modprobe -nq wireguard; then
+		echo "Warning!"
+		echo "Installation was finished, but the WireGuard kernel module could not load."
+		if [[ "$os" == "ubuntu" && "$os_version" -eq 1804 ]]; then
+		echo 'Upgrade the kernel and headers with "apt-get install linux-generic" and restart.'
+		elif [[ "$os" == "debian" && "$os_version" -eq 10 ]]; then
+		echo "Upgrade the kernel with \"apt-get install linux-image-$architecture\" and restart."
+		elif [[ "$os" == "centos" && "$os_version" -le 8 ]]; then
+			echo "Reboot the system to load the most recent kernel."
+		fi
+	else
+		echo "Finished!"
+	fi
+	echo
+	echo "The client configuration is available in:" ~/"$client.conf"
+	echo "New clients can be added by running this script again."
+else
+	clear
+	echo "WireGuard is already installed."
+	echo
+	echo "Select an option:"
+	echo "   1) Add a new client"
+	echo "   2) Remove an existing client"
+	echo "   3) Remove WireGuard"
+	echo "   4) Exit"
+	read -p "Option: " option
+	until [[ "$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
+			# Allow a limited set of characters to avoid conflicts
+			client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
+			while [[ -z "$client" ]] || grep -q "^# BEGIN_PEER $client$" /etc/wireguard/wg0.conf; do
+				echo "$client: invalid name."
+				read -p "Name: " unsanitized_client
+				client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
+			done
+			echo
+			new_client_dns
+			new_client_setup
+			# Append new client configuration to the WireGuard interface
+			wg addconf wg0 <(sed -n "/^# BEGIN_PEER $client/,/^# END_PEER $client/p" /etc/wireguard/wg0.conf)
+			echo
+			qrencode -t UTF8 < ~/"$client.conf"
+			echo -e '\xE2\x86\x91 That is a QR code containing your client configuration.'
+			echo
+			echo "$client added. Configuration available in:" ~/"$client.conf"
+			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=$(grep -c '^# BEGIN_PEER' /etc/wireguard/wg0.conf)
+			if [[ "$number_of_clients" = 0 ]]; then
+				echo
+				echo "There are no existing clients!"
+				exit
+			fi
+			echo
+			echo "Select the client to remove:"
+			grep '^# BEGIN_PEER' /etc/wireguard/wg0.conf | cut -d ' ' -f 3 | nl -s ') '
+			read -p "Client: " client_number
+			until [[ "$client_number" =~ ^[0-9]+$ && "$client_number" -le "$number_of_clients" ]]; do
+				echo "$client_number: invalid selection."
+				read -p "Client: " client_number
+			done
+			client=$(grep '^# BEGIN_PEER' /etc/wireguard/wg0.conf | cut -d ' ' -f 3 | sed -n "$client_number"p)
+			echo
+			read -p "Confirm $client removal? [y/N]: " remove
+			until [[ "$remove" =~ ^[yYnN]*$ ]]; do
+				echo "$remove: invalid selection."
+				read -p "Confirm $client removal? [y/N]: " remove
+			done
+			if [[ "$remove" =~ ^[yY]$ ]]; then
+				# The following is the right way to avoid disrupting other active connections:
+				# Remove from the live interface
+				wg set wg0 peer "$(sed -n "/^# BEGIN_PEER $client$/,\$p" /etc/wireguard/wg0.conf | grep -m 1 PublicKey | cut -d " " -f 3)" remove
+				# Remove from the configuration file
+				sed -i "/^# BEGIN_PEER $client/,/^# END_PEER $client/d" /etc/wireguard/wg0.conf
+				echo
+				echo "$client removed!"
+			else
+				echo
+				echo "$client removal aborted!"
+			fi
+			exit
+		;;
+		3)
+			echo
+			read -p "Confirm WireGuard removal? [y/N]: " remove
+			until [[ "$remove" =~ ^[yYnN]*$ ]]; do
+				echo "$remove: invalid selection."
+				read -p "Confirm WireGuard removal? [y/N]: " remove
+			done
+			if [[ "$remove" =~ ^[yY]$ ]]; then
+				port=$(grep '^ListenPort' /etc/wireguard/wg0.conf | cut -d " " -f 3)
+				if systemctl is-active --quiet firewalld.service; then
+					ip=$(firewall-cmd --direct --get-rules ipv4 nat POSTROUTING | grep '\-s 10.7.0.0/24 '"'"'!'"'"' -d 10.7.0.0/24' | grep -oE '[^ ]+$')
+					# Using both permanent and not permanent rules to avoid a firewalld reload.
+					firewall-cmd --remove-port="$port"/udp
+					firewall-cmd --zone=trusted --remove-source=10.7.0.0/24
+					firewall-cmd --permanent --remove-port="$port"/udp
+					firewall-cmd --permanent --zone=trusted --remove-source=10.7.0.0/24
+					firewall-cmd --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.7.0.0/24 ! -d 10.7.0.0/24 -j SNAT --to "$ip"
+					firewall-cmd --permanent --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.7.0.0/24 ! -d 10.7.0.0/24 -j SNAT --to "$ip"
+					if grep -qs 'fddd:2c4:2c4:2c4::1/64' /etc/wireguard/wg0.conf; then
+						ip6=$(firewall-cmd --direct --get-rules ipv6 nat POSTROUTING | grep '\-s fddd:2c4:2c4:2c4::/64 '"'"'!'"'"' -d fddd:2c4:2c4:2c4::/64' | grep -oE '[^ ]+$')
+						firewall-cmd --zone=trusted --remove-source=fddd:2c4:2c4:2c4::/64
+						firewall-cmd --permanent --zone=trusted --remove-source=fddd:2c4:2c4:2c4::/64
+						firewall-cmd --direct --remove-rule ipv6 nat POSTROUTING 0 -s fddd:2c4:2c4:2c4::/64 ! -d fddd:2c4:2c4:2c4::/64 -j SNAT --to "$ip6"
+						firewall-cmd --permanent --direct --remove-rule ipv6 nat POSTROUTING 0 -s fddd:2c4:2c4:2c4::/64 ! -d fddd:2c4:2c4:2c4::/64 -j SNAT --to "$ip6"
+					fi
+				else
+					systemctl disable --now wg-iptables.service
+					rm -f /etc/systemd/system/wg-iptables.service
+				fi
+				systemctl disable --now wg-quick@wg0.service
+				rm -f /etc/systemd/system/wg-quick@wg0.service.d/boringtun.conf
+				rm -f /etc/sysctl.d/99-wireguard-forward.conf
+				# Different packages were installed if the system was containerized or not
+				if [[ ! "$is_container" -eq 0 ]]; then
+					if [[ "$os" == "ubuntu" ]]; then
+						# Ubuntu
+						rm -rf /etc/wireguard/
+						apt-get remove --purge -y wireguard wireguard-tools
+					elif [[ "$os" == "debian" && "$os_version" -ge 11 ]]; then
+						# Debian 11 or higher
+						rm -rf /etc/wireguard/
+						apt-get remove --purge -y wireguard wireguard-tools
+					elif [[ "$os" == "debian" && "$os_version" -eq 10 ]]; then
+						# Debian 10
+						rm -rf /etc/wireguard/
+						apt-get remove --purge -y wireguard wireguard-dkms wireguard-tools
+					elif [[ "$os" == "centos" && "$os_version" -eq 8 ]]; then
+						# CentOS 8
+						dnf remove -y kmod-wireguard wireguard-tools
+						rm -rf /etc/wireguard/
+					elif [[ "$os" == "centos" && "$os_version" -eq 7 ]]; then
+						# CentOS 7
+						yum remove -y kmod-wireguard wireguard-tools
+						rm -rf /etc/wireguard/
+					elif [[ "$os" == "fedora" ]]; then
+						# Fedora
+						dnf remove -y wireguard-tools
+						rm -rf /etc/wireguard/
+					fi
+				else
+					{ crontab -l 2>/dev/null | grep -v '/usr/local/sbin/boringtun-upgrade' ; } | crontab -
+					if [[ "$os" == "ubuntu" ]]; then
+						# Ubuntu
+						rm -rf /etc/wireguard/
+						apt-get remove --purge -y wireguard-tools
+					elif [[ "$os" == "debian" && "$os_version" -ge 11 ]]; then
+						# Debian 11 or higher
+						rm -rf /etc/wireguard/
+						apt-get remove --purge -y wireguard-tools
+					elif [[ "$os" == "debian" && "$os_version" -eq 10 ]]; then
+						# Debian 10
+						rm -rf /etc/wireguard/
+						apt-get remove --purge -y wireguard-tools
+					elif [[ "$os" == "centos" && "$os_version" -eq 8 ]]; then
+						# CentOS 8
+						dnf remove -y wireguard-tools
+						rm -rf /etc/wireguard/
+					elif [[ "$os" == "centos" && "$os_version" -eq 7 ]]; then
+						# CentOS 7
+						yum remove -y wireguard-tools
+						rm -rf /etc/wireguard/
+					elif [[ "$os" == "fedora" ]]; then
+						# Fedora
+						dnf remove -y wireguard-tools
+						rm -rf /etc/wireguard/
+					fi
+					rm -f /usr/local/sbin/boringtun /usr/local/sbin/boringtun-upgrade
+				fi
+				echo
+				echo "WireGuard removed!"
+			else
+				echo
+				echo "WireGuard removal aborted!"
+			fi
+			exit
+		;;
+		4)
+			exit
+		;;
+	esac
+fi