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wireguard-install.sh
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wireguard-install.sh
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#!/bin/bash
#
# https://github.com/hwdsl2/wireguard-install
#
# Based on the work of Nyr and contributors at:
# https://github.com/Nyr/wireguard-install
#
# Copyright (c) 2022-2024 Lin Song <[email protected]>
# Copyright (c) 2020-2023 Nyr
#
# Released under the MIT License, see the accompanying file LICENSE.txt
# or https://opensource.org/licenses/MIT
exiterr() { echo "Error: $1" >&2; exit 1; }
exiterr2() { exiterr "'apt-get install' failed."; }
exiterr3() { exiterr "'yum install' failed."; }
exiterr4() { exiterr "'zypper install' failed."; }
check_ip() {
IP_REGEX='^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$'
printf '%s' "$1" | tr -d '\n' | grep -Eq "$IP_REGEX"
}
check_pvt_ip() {
IPP_REGEX='^(10|127|172\.(1[6-9]|2[0-9]|3[0-1])|192\.168|169\.254)\.'
printf '%s' "$1" | tr -d '\n' | grep -Eq "$IPP_REGEX"
}
check_dns_name() {
FQDN_REGEX='^([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}$'
printf '%s' "$1" | tr -d '\n' | grep -Eq "$FQDN_REGEX"
}
check_root() {
if [ "$(id -u)" != 0 ]; then
exiterr "This installer must be run as root. Try 'sudo bash $0'"
fi
}
check_shell() {
# Detect Debian users running the script with "sh" instead of bash
if readlink /proc/$$/exe | grep -q "dash"; then
exiterr 'This installer needs to be run with "bash", not "sh".'
fi
}
check_kernel() {
# Detect OpenVZ 6
if [[ $(uname -r | cut -d "." -f 1) -eq 2 ]]; then
exiterr "The system is running an old kernel, which is incompatible with this installer."
fi
}
check_os() {
if grep -qs "ubuntu" /etc/os-release; then
os="ubuntu"
os_version=$(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=$(grep -oE '[0-9]+' /etc/fedora-release | head -1)
elif [[ -e /etc/SUSE-brand && "$(head -1 /etc/SUSE-brand)" == "openSUSE" ]]; then
os="openSUSE"
os_version=$(tail -1 /etc/SUSE-brand | grep -oE '[0-9\\.]+')
else
exiterr "This installer seems to be running on an unsupported distribution.
Supported distros are Ubuntu, Debian, AlmaLinux, Rocky Linux, CentOS, Fedora and openSUSE."
fi
}
check_os_ver() {
if [[ "$os" == "ubuntu" && "$os_version" -lt 2004 ]]; then
exiterr "Ubuntu 20.04 or higher is required to use this installer.
This version of Ubuntu is too old and unsupported."
fi
if [[ "$os" == "debian" && "$os_version" -lt 11 ]]; then
exiterr "Debian 11 or higher is required to use this installer.
This version of Debian is too old and unsupported."
fi
if [[ "$os" == "centos" && "$os_version" -lt 8 ]]; then
exiterr "CentOS 8 or higher is required to use this installer.
This version of CentOS is too old and unsupported."
fi
}
check_container() {
if systemd-detect-virt -cq 2>/dev/null; then
exiterr "This system is running inside a container, which is not supported by this installer."
fi
}
set_client_name() {
# Allow a limited set of characters to avoid conflicts
# Limit to 15 characters for compatibility with Linux clients
client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client" | cut -c-15)
}
parse_args() {
while [ "$#" -gt 0 ]; do
case $1 in
--auto)
auto=1
shift
;;
--addclient)
add_client=1
unsanitized_client="$2"
shift
shift
;;
--listclients)
list_clients=1
shift
;;
--removeclient)
remove_client=1
unsanitized_client="$2"
shift
shift
;;
--showclientqr)
show_client_qr=1
unsanitized_client="$2"
shift
shift
;;
--uninstall)
remove_wg=1
shift
;;
--serveraddr)
server_addr="$2"
shift
shift
;;
--port)
server_port="$2"
shift
shift
;;
--clientname)
first_client_name="$2"
shift
shift
;;
--dns1)
dns1="$2"
shift
shift
;;
--dns2)
dns2="$2"
shift
shift
;;
-y|--yes)
assume_yes=1
shift
;;
-h|--help)
show_usage
;;
*)
show_usage "Unknown parameter: $1"
;;
esac
done
}
check_args() {
if [ "$auto" != 0 ] && [ -e "$WG_CONF" ]; then
show_usage "Invalid parameter '--auto'. WireGuard is already set up on this server."
fi
if [ "$((add_client + list_clients + remove_client + show_client_qr))" -gt 1 ]; then
show_usage "Invalid parameters. Specify only one of '--addclient', '--listclients', '--removeclient' or '--showclientqr'."
fi
if [ "$remove_wg" = 1 ]; then
if [ "$((add_client + list_clients + remove_client + show_client_qr + auto))" -gt 0 ]; then
show_usage "Invalid parameters. '--uninstall' cannot be specified with other parameters."
fi
fi
if [ ! -e "$WG_CONF" ]; then
st_text="You must first set up WireGuard before"
[ "$add_client" = 1 ] && exiterr "$st_text adding a client."
[ "$list_clients" = 1 ] && exiterr "$st_text listing clients."
[ "$remove_client" = 1 ] && exiterr "$st_text removing a client."
[ "$show_client_qr" = 1 ] && exiterr "$st_text showing QR code for a client."
[ "$remove_wg" = 1 ] && exiterr "Cannot remove WireGuard because it has not been set up on this server."
fi
if [ "$((add_client + remove_client + show_client_qr))" = 1 ] && [ -n "$first_client_name" ]; then
show_usage "Invalid parameters. '--clientname' can only be specified when installing WireGuard."
fi
if [ -n "$server_addr" ] || [ -n "$server_port" ] || [ -n "$first_client_name" ]; then
if [ -e "$WG_CONF" ]; then
show_usage "Invalid parameters. WireGuard is already set up on this server."
elif [ "$auto" = 0 ]; then
show_usage "Invalid parameters. You must specify '--auto' when using these parameters."
fi
fi
if [ "$add_client" = 1 ]; then
set_client_name
if [ -z "$client" ]; then
exiterr "Invalid client name. Use one word only, no special characters except '-' and '_'."
elif grep -q "^# BEGIN_PEER $client$" "$WG_CONF"; then
exiterr "$client: invalid name. Client already exists."
fi
fi
if [ "$remove_client" = 1 ] || [ "$show_client_qr" = 1 ]; then
set_client_name
if [ -z "$client" ] || ! grep -q "^# BEGIN_PEER $client$" "$WG_CONF"; then
exiterr "Invalid client name, or client does not exist."
fi
fi
if [ -n "$server_addr" ] && { ! check_dns_name "$server_addr" && ! check_ip "$server_addr"; }; then
exiterr "Invalid server address. Must be a fully qualified domain name (FQDN) or an IPv4 address."
fi
if [ -n "$first_client_name" ]; then
unsanitized_client="$first_client_name"
set_client_name
if [ -z "$client" ]; then
exiterr "Invalid client name. Use one word only, no special characters except '-' and '_'."
fi
fi
if [ -n "$server_port" ]; then
if [[ ! "$server_port" =~ ^[0-9]+$ || "$server_port" -gt 65535 ]]; then
exiterr "Invalid port. Must be an integer between 1 and 65535."
fi
fi
if [ -n "$dns1" ]; then
if [ -e "$WG_CONF" ] && [ "$add_client" = 0 ]; then
show_usage "Invalid parameters. Custom DNS server(s) can only be specified when installing WireGuard or adding a client."
fi
fi
if { [ -n "$dns1" ] && ! check_ip "$dns1"; } \
|| { [ -n "$dns2" ] && ! check_ip "$dns2"; }; then
exiterr "Invalid DNS server(s)."
fi
if [ -z "$dns1" ] && [ -n "$dns2" ]; then
show_usage "Invalid DNS server. --dns2 cannot be specified without --dns1."
fi
if [ -n "$dns1" ] && [ -n "$dns2" ]; then
dns="$dns1, $dns2"
elif [ -n "$dns1" ]; then
dns="$dns1"
else
dns="8.8.8.8, 8.8.4.4"
fi
}
check_nftables() {
if [ "$os" = "centos" ]; then
if grep -qs "hwdsl2 VPN script" /etc/sysconfig/nftables.conf \
|| systemctl is-active --quiet nftables 2>/dev/null; then
exiterr "This system has nftables enabled, which is not supported by this installer."
fi
fi
}
install_wget() {
# Detect some Debian minimal setups where neither wget nor curl are installed
if ! hash wget 2>/dev/null && ! hash curl 2>/dev/null; then
if [ "$auto" = 0 ]; then
echo "Wget is required to use this installer."
read -n1 -r -p "Press any key to install Wget and continue..."
fi
export DEBIAN_FRONTEND=noninteractive
(
set -x
apt-get -yqq update || apt-get -yqq update
apt-get -yqq install wget >/dev/null
) || exiterr2
fi
}
install_iproute() {
if ! hash ip 2>/dev/null; then
if [ "$auto" = 0 ]; then
echo "iproute is required to use this installer."
read -n1 -r -p "Press any key to install iproute and continue..."
fi
if [ "$os" = "debian" ] || [ "$os" = "ubuntu" ]; then
export DEBIAN_FRONTEND=noninteractive
(
set -x
apt-get -yqq update || apt-get -yqq update
apt-get -yqq install iproute2 >/dev/null
) || exiterr2
elif [ "$os" = "openSUSE" ]; then
(
set -x
zypper install iproute2 >/dev/null
) || exiterr4
else
(
set -x
yum -y -q install iproute >/dev/null
) || exiterr3
fi
fi
}
show_header() {
cat <<'EOF'
WireGuard Script
https://github.com/hwdsl2/wireguard-install
EOF
}
show_header2() {
cat <<'EOF'
Welcome to this WireGuard server installer!
GitHub: https://github.com/hwdsl2/wireguard-install
EOF
}
show_header3() {
cat <<'EOF'
Copyright (c) 2022-2024 Lin Song
Copyright (c) 2020-2023 Nyr
EOF
}
show_usage() {
if [ -n "$1" ]; then
echo "Error: $1" >&2
fi
show_header
show_header3
cat 1>&2 <<EOF
Usage: bash $0 [options]
Options:
--addclient [client name] add a new client
--dns1 [DNS server IP] primary DNS server for new client (optional, default: Google Public DNS)
--dns2 [DNS server IP] secondary DNS server for new client (optional)
--listclients list the names of existing clients
--removeclient [client name] remove an existing client
--showclientqr [client name] show QR code for an existing client
--uninstall remove WireGuard and delete all configuration
-y, --yes assume "yes" as answer to prompts when removing a client or removing WireGuard
-h, --help show this help message and exit
Install options (optional):
--auto auto install WireGuard using default or custom options
--serveraddr [DNS name or IP] server address, must be a fully qualified domain name (FQDN) or an IPv4 address
--port [number] port for WireGuard (1-65535, default: 51820)
--clientname [client name] name for the first WireGuard client (default: client)
--dns1 [DNS server IP] primary DNS server for first client (default: Google Public DNS)
--dns2 [DNS server IP] secondary DNS server for first client
To customize options, you may also run this script without arguments.
EOF
exit 1
}
show_welcome() {
if [ "$auto" = 0 ]; then
show_header2
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.'
else
show_header
op_text=default
if [ -n "$server_addr" ] || [ -n "$server_port" ] \
|| [ -n "$first_client_name" ] || [ -n "$dns1" ]; then
op_text=custom
fi
echo
echo "Starting WireGuard setup using $op_text options."
fi
}
show_dns_name_note() {
cat <<EOF
Note: Make sure this DNS name '$1'
resolves to the IPv4 address of this server.
EOF
}
enter_server_address() {
echo
echo "Do you want WireGuard VPN clients to connect to this server using a DNS name,"
printf "e.g. vpn.example.com, instead of its IP address? [y/N] "
read -r response
case $response in
[yY][eE][sS]|[yY])
use_dns_name=1
echo
;;
*)
use_dns_name=0
;;
esac
if [ "$use_dns_name" = 1 ]; then
read -rp "Enter the DNS name of this VPN server: " server_addr_i
until check_dns_name "$server_addr_i"; do
echo "Invalid DNS name. You must enter a fully qualified domain name (FQDN)."
read -rp "Enter the DNS name of this VPN server: " server_addr_i
done
ip="$server_addr_i"
show_dns_name_note "$ip"
else
detect_ip
check_nat_ip
fi
}
find_public_ip() {
ip_url1="http://ipv4.icanhazip.com"
ip_url2="http://ip1.dynupdate.no-ip.com"
# Get public IP and sanitize with grep
get_public_ip=$(grep -m 1 -oE '^[0-9]{1,3}(\.[0-9]{1,3}){3}$' <<< "$(wget -T 10 -t 1 -4qO- "$ip_url1" || curl -m 10 -4Ls "$ip_url1")")
if ! check_ip "$get_public_ip"; then
get_public_ip=$(grep -m 1 -oE '^[0-9]{1,3}(\.[0-9]{1,3}){3}$' <<< "$(wget -T 10 -t 1 -4qO- "$ip_url2" || curl -m 10 -4Ls "$ip_url2")")
fi
}
detect_ip() {
# If system has a single IPv4, it is selected automatically.
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
# Use the IP address on the default route
ip=$(ip -4 route get 1 | sed 's/ uid .*//' | awk '{print $NF;exit}' 2>/dev/null)
if ! check_ip "$ip"; then
find_public_ip
ip_match=0
if [ -n "$get_public_ip" ]; then
ip_list=$(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}')
while IFS= read -r line; do
if [ "$line" = "$get_public_ip" ]; then
ip_match=1
ip="$line"
fi
done <<< "$ip_list"
fi
if [ "$ip_match" = 0 ]; then
if [ "$auto" = 0 ]; then
echo
echo "Which IPv4 address should be used?"
num_of_ip=$(ip -4 addr | grep inet | grep -vEc '127(\.[0-9]{1,3}){3}')
ip -4 addr | grep inet | grep -vE '127(\.[0-9]{1,3}){3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | nl -s ') '
read -rp "IPv4 address [1]: " ip_num
until [[ -z "$ip_num" || "$ip_num" =~ ^[0-9]+$ && "$ip_num" -le "$num_of_ip" ]]; do
echo "$ip_num: invalid selection."
read -rp "IPv4 address [1]: " ip_num
done
[[ -z "$ip_num" ]] && ip_num=1
else
ip_num=1
fi
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_num"p)
fi
fi
fi
if ! check_ip "$ip"; then
echo "Error: Could not detect this server's IP address." >&2
echo "Abort. No changes were made." >&2
exit 1
fi
}
check_nat_ip() {
# If $ip is a private IP address, the server must be behind NAT
if check_pvt_ip "$ip"; then
find_public_ip
if ! check_ip "$get_public_ip"; then
if [ "$auto" = 0 ]; then
echo
echo "This server is behind NAT. What is the public IPv4 address?"
read -rp "Public IPv4 address: " public_ip
until check_ip "$public_ip"; do
echo "Invalid input."
read -rp "Public IPv4 address: " public_ip
done
else
echo "Error: Could not detect this server's public IP." >&2
echo "Abort. No changes were made." >&2
exit 1
fi
else
public_ip="$get_public_ip"
fi
fi
}
show_config() {
if [ "$auto" != 0 ]; then
echo
if [ -n "$server_addr" ]; then
echo "Server address: $server_addr"
else
printf '%s' "Server IP: "
[ -n "$public_ip" ] && printf '%s\n' "$public_ip" || printf '%s\n' "$ip"
fi
[ -n "$server_port" ] && port_text="$server_port" || port_text=51820
[ -n "$first_client_name" ] && client_text="$client" || client_text=client
if [ -n "$dns1" ] && [ -n "$dns2" ]; then
dns_text="$dns1, $dns2"
elif [ -n "$dns1" ]; then
dns_text="$dns1"
else
dns_text="Google Public DNS"
fi
echo "Port: UDP/$port_text"
echo "Client name: $client_text"
echo "Client DNS: $dns_text"
fi
}
detect_ipv6() {
ip6=""
if [[ $(ip -6 addr | grep -c 'inet6 [23]') -ne 0 ]]; then
ip6=$(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}' | sed -n 1p)
fi
}
select_port() {
if [ "$auto" = 0 ]; then
echo
echo "Which port should WireGuard listen to?"
read -rp "Port [51820]: " port
until [[ -z "$port" || "$port" =~ ^[0-9]+$ && "$port" -le 65535 ]]; do
echo "$port: invalid port."
read -rp "Port [51820]: " port
done
[[ -z "$port" ]] && port=51820
else
[ -n "$server_port" ] && port="$server_port" || port=51820
fi
}
enter_custom_dns() {
read -rp "Enter primary DNS server: " dns1
until check_ip "$dns1"; do
echo "Invalid DNS server."
read -rp "Enter primary DNS server: " dns1
done
read -rp "Enter secondary DNS server (Enter to skip): " dns2
until [ -z "$dns2" ] || check_ip "$dns2"; do
echo "Invalid DNS server."
read -rp "Enter secondary DNS server (Enter to skip): " dns2
done
}
enter_first_client_name() {
if [ "$auto" = 0 ]; then
echo
echo "Enter a name for the first client:"
read -rp "Name [client]: " unsanitized_client
set_client_name
[[ -z "$client" ]] && client=client
else
if [ -n "$first_client_name" ]; then
unsanitized_client="$first_client_name"
set_client_name
else
client=client
fi
fi
}
show_setup_ready() {
if [ "$auto" = 0 ]; then
echo
echo "WireGuard installation is ready to begin."
fi
}
check_firewall() {
# Install a firewall if firewalld or iptables are not already available
if ! systemctl is-active --quiet firewalld.service && ! hash iptables 2>/dev/null; then
if [[ "$os" == "centos" || "$os" == "fedora" ]]; then
firewall="firewalld"
elif [[ "$os" == "openSUSE" ]]; then
firewall="firewalld"
elif [[ "$os" == "debian" || "$os" == "ubuntu" ]]; then
firewall="iptables"
fi
if [[ "$firewall" == "firewalld" ]]; then
# We don't want to silently enable firewalld, so we give a subtle warning
# If the user continues, firewalld will be installed and enabled during setup
echo
echo "Note: firewalld, which is required to manage routing tables, will also be installed."
fi
fi
}
abort_and_exit() {
echo "Abort. No changes were made." >&2
exit 1
}
confirm_setup() {
if [ "$auto" = 0 ]; then
printf "Do you want to continue? [Y/n] "
read -r response
case $response in
[yY][eE][sS]|[yY]|'')
:
;;
*)
abort_and_exit
;;
esac
fi
}
show_start_setup() {
echo
echo "Installing WireGuard, please wait..."
}
install_pkgs() {
if [[ "$os" == "ubuntu" ]]; then
export DEBIAN_FRONTEND=noninteractive
(
set -x
apt-get -yqq update || apt-get -yqq update
apt-get -yqq install wireguard qrencode $firewall >/dev/null
) || exiterr2
elif [[ "$os" == "debian" ]]; then
export DEBIAN_FRONTEND=noninteractive
(
set -x
apt-get -yqq update || apt-get -yqq update
apt-get -yqq install wireguard qrencode $firewall >/dev/null
) || exiterr2
elif [[ "$os" == "centos" && "$os_version" -eq 9 ]]; then
(
set -x
yum -y -q install epel-release >/dev/null
yum -y -q install wireguard-tools qrencode $firewall >/dev/null 2>&1
) || exiterr3
mkdir -p /etc/wireguard/
elif [[ "$os" == "centos" && "$os_version" -eq 8 ]]; then
(
set -x
yum -y -q install epel-release elrepo-release >/dev/null
yum -y -q --nobest install kmod-wireguard >/dev/null 2>&1
yum -y -q install wireguard-tools qrencode $firewall >/dev/null 2>&1
) || exiterr3
mkdir -p /etc/wireguard/
elif [[ "$os" == "fedora" ]]; then
(
set -x
dnf install -y wireguard-tools qrencode $firewall >/dev/null
) || exiterr "'dnf install' failed."
mkdir -p /etc/wireguard/
elif [[ "$os" == "openSUSE" ]]; then
(
set -x
zypper install -y wireguard-tools qrencode $firewall >/dev/null
) || exiterr4
mkdir -p /etc/wireguard/
fi
[ ! -d /etc/wireguard ] && exiterr2
# If firewalld was just installed, enable it
if [[ "$firewall" == "firewalld" ]]; then
(
set -x
systemctl enable --now firewalld.service >/dev/null 2>&1
)
fi
}
remove_pkgs() {
if [[ "$os" == "ubuntu" ]]; then
(
set -x
rm -rf /etc/wireguard/
apt-get remove --purge -y wireguard wireguard-tools >/dev/null
)
elif [[ "$os" == "debian" ]]; then
(
set -x
rm -rf /etc/wireguard/
apt-get remove --purge -y wireguard wireguard-tools >/dev/null
)
elif [[ "$os" == "centos" && "$os_version" -eq 9 ]]; then
(
set -x
yum -y -q remove wireguard-tools >/dev/null
rm -rf /etc/wireguard/
)
elif [[ "$os" == "centos" && "$os_version" -le 8 ]]; then
(
set -x
yum -y -q remove kmod-wireguard wireguard-tools >/dev/null
rm -rf /etc/wireguard/
)
elif [[ "$os" == "fedora" ]]; then
(
set -x
dnf remove -y wireguard-tools >/dev/null
rm -rf /etc/wireguard/
)
elif [[ "$os" == "openSUSE" ]]; then
(
set -x
zypper remove -y wireguard-tools >/dev/null
rm -rf /etc/wireguard/
)
fi
}
create_server_config() {
# Generate wg0.conf
cat << EOF > "$WG_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 = $port
EOF
chmod 600 "$WG_CONF"
}
create_firewall_rules() {
if systemctl is-active --quiet firewalld.service; then
# Using both permanent and not permanent rules to avoid a firewalld reload
firewall-cmd -q --add-port="$port"/udp
firewall-cmd -q --zone=trusted --add-source=10.7.0.0/24
firewall-cmd -q --permanent --add-port="$port"/udp
firewall-cmd -q --permanent --zone=trusted --add-source=10.7.0.0/24
# Set NAT for the VPN subnet
firewall-cmd -q --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.7.0.0/24 ! -d 10.7.0.0/24 -j MASQUERADE
firewall-cmd -q --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.7.0.0/24 ! -d 10.7.0.0/24 -j MASQUERADE
if [[ -n "$ip6" ]]; then
firewall-cmd -q --zone=trusted --add-source=fddd:2c4:2c4:2c4::/64
firewall-cmd -q --permanent --zone=trusted --add-source=fddd:2c4:2c4:2c4::/64
firewall-cmd -q --direct --add-rule ipv6 nat POSTROUTING 0 -s fddd:2c4:2c4:2c4::/64 ! -d fddd:2c4:2c4:2c4::/64 -j MASQUERADE
firewall-cmd -q --permanent --direct --add-rule ipv6 nat POSTROUTING 0 -s fddd:2c4:2c4:2c4::/64 ! -d fddd:2c4:2c4:2c4::/64 -j MASQUERADE
fi
else
# Create a service to set up persistent iptables rules
iptables_path=$(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=$iptables_path -t nat -A POSTROUTING -s 10.7.0.0/24 ! -d 10.7.0.0/24 -j MASQUERADE
ExecStart=$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 MASQUERADE
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=$ip6tables_path -t nat -A POSTROUTING -s fddd:2c4:2c4:2c4::/64 ! -d fddd:2c4:2c4:2c4::/64 -j MASQUERADE
ExecStart=$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 MASQUERADE
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
(
set -x
systemctl enable --now wg-iptables.service >/dev/null 2>&1
)
fi
}
remove_firewall_rules() {
port=$(grep '^ListenPort' "$WG_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 -q --remove-port="$port"/udp
firewall-cmd -q --zone=trusted --remove-source=10.7.0.0/24
firewall-cmd -q --permanent --remove-port="$port"/udp
firewall-cmd -q --permanent --zone=trusted --remove-source=10.7.0.0/24
firewall-cmd -q --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.7.0.0/24 ! -d 10.7.0.0/24 -j MASQUERADE
firewall-cmd -q --permanent --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.7.0.0/24 ! -d 10.7.0.0/24 -j MASQUERADE
if grep -qs 'fddd:2c4:2c4:2c4::1/64' "$WG_CONF"; then
ip6=$(firewall-cmd --direct --get-rules ipv6 nat POSTROUTING | grep '\-s fddd:2c4:2c4:2c4::/64 '"'"'!'"'"' -d fddd:2c4:2c4:2c4::/64' | grep -oE '[^ ]+$')
firewall-cmd -q --zone=trusted --remove-source=fddd:2c4:2c4:2c4::/64
firewall-cmd -q --permanent --zone=trusted --remove-source=fddd:2c4:2c4:2c4::/64
firewall-cmd -q --direct --remove-rule ipv6 nat POSTROUTING 0 -s fddd:2c4:2c4:2c4::/64 ! -d fddd:2c4:2c4:2c4::/64 -j MASQUERADE
firewall-cmd -q --permanent --direct --remove-rule ipv6 nat POSTROUTING 0 -s fddd:2c4:2c4:2c4::/64 ! -d fddd:2c4:2c4:2c4::/64 -j MASQUERADE
fi
else
systemctl disable --now wg-iptables.service
rm -f /etc/systemd/system/wg-iptables.service
fi
}
get_export_dir() {
export_to_home_dir=0
export_dir=~/
if [ -n "$SUDO_USER" ] && getent group "$SUDO_USER" >/dev/null 2>&1; then
user_home_dir=$(getent passwd "$SUDO_USER" 2>/dev/null | cut -d: -f6)
if [ -d "$user_home_dir" ] && [ "$user_home_dir" != "/" ]; then
export_dir="$user_home_dir/"
export_to_home_dir=1
fi
fi
}
select_dns() {
if [ "$auto" = 0 ]; then
echo
echo "Select a DNS server for the client:"
echo " 1) Current system resolvers"
echo " 2) Google Public DNS"
echo " 3) Cloudflare DNS"
echo " 4) OpenDNS"
echo " 5) Quad9"
echo " 6) AdGuard DNS"
echo " 7) Custom"
read -rp "DNS server [2]: " dns
until [[ -z "$dns" || "$dns" =~ ^[1-7]$ ]]; do
echo "$dns: invalid selection."
read -rp "DNS server [2]: " dns
done
else
dns=2
fi
# DNS
case "$dns" in
1)
# Locate the proper resolv.conf
# Needed for systems running systemd-resolved
if grep '^nameserver' "/etc/resolv.conf" | grep -qv '127.0.0.53' ; then
resolv_conf="/etc/resolv.conf"
else
resolv_conf="/run/systemd/resolve/resolv.conf"
fi
# Extract nameservers and provide them in the required format
dns=$(grep -v '^#\|^;' "$resolv_conf" | grep '^nameserver' | grep -v '127.0.0.53' | 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"
;;
7)
enter_custom_dns
if [ -n "$dns2" ]; then
dns="$dns1, $dns2"
else
dns="$dns1"
fi
;;
esac
}
select_client_ip() {
# 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 "$WG_CONF" | cut -d "." -f 4 | cut -d "/" -f 1 | grep -q "^$octet$"; do
(( octet++ ))
done
# Don't break the WireGuard configuration in case the address space is full
if [[ "$octet" -eq 255 ]]; then
exiterr "253 clients are already configured. The WireGuard internal subnet is full!"
fi
}
new_client() {
select_client_ip
specify_ip=n
if [ "$1" = "add_client" ] && [ "$add_client" = 0 ]; then
echo
read -rp "Do you want to specify an internal IP address for the new client? [y/N]: " specify_ip
until [[ "$specify_ip" =~ ^[yYnN]*$ ]]; do
echo "$specify_ip: invalid selection."
read -rp "Do you want to specify an internal IP address for the new client? [y/N]: " specify_ip
done
if [[ ! "$specify_ip" =~ ^[yY]$ ]]; then
echo "Using auto assigned IP address 10.7.0.$octet."
fi
fi
if [[ "$specify_ip" =~ ^[yY]$ ]]; then
echo
read -rp "Enter IP address for the new client (e.g. 10.7.0.X): " client_ip
octet=$(printf '%s' "$client_ip" | cut -d "." -f 4)
until [[ $client_ip =~ ^10\.7\.0\.([2-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-4])$ ]] \
&& ! grep AllowedIPs "$WG_CONF" | cut -d "." -f 4 | cut -d "/" -f 1 | grep -q "^$octet$"; do
if [[ ! $client_ip =~ ^10\.7\.0\.([2-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-4])$ ]]; then
echo "Invalid IP address. Must be within the range 10.7.0.2 to 10.7.0.254."
else
echo "The IP address is already in use. Please choose another one."
fi
read -rp "Enter IP address for the new client (e.g. 10.7.0.X): " client_ip
octet=$(printf '%s' "$client_ip" | cut -d "." -f 4)
done
fi
key=$(wg genkey)
psk=$(wg genpsk)
# Configure client in the server
cat << EOF >> "$WG_CONF"
# BEGIN_PEER $client
[Peer]
PublicKey = $(wg pubkey <<< "$key")
PresharedKey = $psk
AllowedIPs = 10.7.0.$octet/32$(grep -q 'fddd:2c4:2c4:2c4::1' "$WG_CONF" && echo ", fddd:2c4:2c4:2c4::$octet/128")
# END_PEER $client
EOF
# Create client configuration
get_export_dir
cat << EOF > "$export_dir$client".conf
[Interface]
Address = 10.7.0.$octet/24$(grep -q 'fddd:2c4:2c4:2c4::1' "$WG_CONF" && echo ", fddd:2c4:2c4:2c4::$octet/64")
DNS = $dns
PrivateKey = $key
[Peer]
PublicKey = $(grep PrivateKey "$WG_CONF" | cut -d " " -f 3 | wg pubkey)
PresharedKey = $psk
AllowedIPs = 0.0.0.0/0, ::/0
Endpoint = $(grep '^# ENDPOINT' "$WG_CONF" | cut -d " " -f 3):$(grep ListenPort "$WG_CONF" | cut -d " " -f 3)
PersistentKeepalive = 25
EOF
if [ "$export_to_home_dir" = 1 ]; then
chown "$SUDO_USER:$SUDO_USER" "$export_dir$client".conf
fi
chmod 600 "$export_dir$client".conf
}
update_sysctl() {
mkdir -p /etc/sysctl.d
conf_fwd="/etc/sysctl.d/99-wireguard-forward.conf"
conf_opt="/etc/sysctl.d/99-wireguard-optimize.conf"
# Enable net.ipv4.ip_forward for the system
echo 'net.ipv4.ip_forward=1' > "$conf_fwd"
if [[ -n "$ip6" ]]; then
# Enable net.ipv6.conf.all.forwarding for the system
echo "net.ipv6.conf.all.forwarding=1" >> "$conf_fwd"
fi
# Optimize sysctl settings such as TCP buffer sizes
base_url="https://github.com/hwdsl2/vpn-extras/releases/download/v1.0.0"
conf_url="$base_url/sysctl-wg-$os"
[ "$auto" != 0 ] && conf_url="${conf_url}-auto"
wget -t 3 -T 30 -q -O "$conf_opt" "$conf_url" 2>/dev/null \
|| curl -m 30 -fsL "$conf_url" -o "$conf_opt" 2>/dev/null \
|| { /bin/rm -f "$conf_opt"; touch "$conf_opt"; }
# Enable TCP BBR congestion control if kernel version >= 4.20
if modprobe -q tcp_bbr \
&& printf '%s\n%s' "4.20" "$(uname -r)" | sort -C -V \
&& [ -f /proc/sys/net/ipv4/tcp_congestion_control ]; then
cat >> "$conf_opt" <<'EOF'
net.core.default_qdisc = fq
net.ipv4.tcp_congestion_control = bbr
EOF
fi
# Apply sysctl settings
sysctl -e -q -p "$conf_fwd"
sysctl -e -q -p "$conf_opt"
}
update_rclocal() {
ipt_cmd="systemctl restart wg-iptables.service"
if ! grep -qs "$ipt_cmd" /etc/rc.local; then
if [ ! -f /etc/rc.local ]; then
echo '#!/bin/sh' > /etc/rc.local
else
if [ "$os" = "ubuntu" ] || [ "$os" = "debian" ]; then
sed --follow-symlinks -i '/^exit 0/d' /etc/rc.local
fi
fi