mirror of
https://github.com/Nyr/openvpn-install.git
synced 2025-04-12 21:40:57 +00:00
0b89cec77a
Introduce an interactive prompt for specifying allowed subnets for VPN clients (10.8.0.0/24). The script now builds custom iptables rules based on user input and persists them via a systemd service, while retaining the original EasyRSA extraction and configuration.
588 lines
26 KiB
Bash
588 lines
26 KiB
Bash
#!/bin/bash
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#
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# https://github.com/Nyr/openvpn-install
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#
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# Copyright (c) 2013 Nyr. Released under the MIT License.
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#
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# Detect Debian users running the script with "sh" instead of bash
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if readlink /proc/$$/exe | grep -q "dash"; then
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echo 'This installer needs to be run with "bash", not "sh".'
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exit
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fi
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# Discard stdin. Needed when running from a one-liner which includes a newline
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read -N 999999 -t 0.001
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# Detect OS (with some variables kept for convenience)
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if grep -qs "ubuntu" /etc/os-release; then
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os="ubuntu"
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os_version=$(grep 'VERSION_ID' /etc/os-release | cut -d '"' -f 2 | tr -d '.')
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group_name="nogroup"
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elif [[ -e /etc/debian_version ]]; then
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os="debian"
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os_version=$(grep -oE '[0-9]+' /etc/debian_version | head -1)
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group_name="nogroup"
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elif [[ -e /etc/almalinux-release || -e /etc/rocky-release || -e /etc/centos-release ]]; then
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os="centos"
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os_version=$(grep -shoE '[0-9]+' /etc/almalinux-release /etc/rocky-release /etc/centos-release | head -1)
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group_name="nobody"
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elif [[ -e /etc/fedora-release ]]; then
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os="fedora"
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os_version=$(grep -oE '[0-9]+' /etc/fedora-release | head -1)
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group_name="nobody"
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else
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echo "This installer seems to be running on an unsupported distribution.
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Supported distros are Ubuntu, Debian, AlmaLinux, Rocky Linux, CentOS and Fedora."
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exit
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fi
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if [[ "$os" == "ubuntu" && "$os_version" -lt 2204 ]]; then
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echo "Ubuntu 22.04 or higher is required to use this installer.
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This version of Ubuntu is too old and unsupported."
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exit
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fi
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if [[ "$os" == "debian" ]]; then
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if grep -q '/sid' /etc/debian_version; then
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echo "Debian Testing and Debian Unstable are unsupported by this installer."
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exit
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fi
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if [[ "$os_version" -lt 11 ]]; then
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echo "Debian 11 or higher is required to use this installer.
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This version of Debian is too old and unsupported."
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exit
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fi
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fi
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if [[ "$os" == "centos" && "$os_version" -lt 9 ]]; then
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os_name=$(sed 's/ release.*//' /etc/almalinux-release /etc/rocky-release /etc/centos-release 2>/dev/null | head -1)
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echo "$os_name 9 or higher is required to use this installer.
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This version of $os_name is too old and unsupported."
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exit
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fi
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# Detect environments where $PATH does not include the sbin directories
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if ! grep -q sbin <<< "$PATH"; then
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echo '$PATH does not include sbin. Try using "su -" instead of "su".'
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exit
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fi
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if [[ "$EUID" -ne 0 ]]; then
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echo "This installer needs to be run with superuser privileges."
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exit
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fi
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if [[ ! -e /dev/net/tun ]] || ! ( exec 7<>/dev/net/tun ) 2>/dev/null; then
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echo "The system does not have the TUN device available.
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TUN needs to be enabled before running this installer."
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exit
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fi
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# Store the absolute path of the directory where the script is located
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script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
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new_client () {
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# Generates the custom client.ovpn
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{
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cat /etc/openvpn/server/client-common.txt
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echo "<ca>"
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cat /etc/openvpn/server/easy-rsa/pki/ca.crt
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echo "</ca>"
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echo "<cert>"
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sed -ne '/BEGIN CERTIFICATE/,$ p' /etc/openvpn/server/easy-rsa/pki/issued/"$client".crt
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echo "</cert>"
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echo "<key>"
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cat /etc/openvpn/server/easy-rsa/pki/private/"$client".key
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echo "</key>"
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echo "<tls-crypt>"
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sed -ne '/BEGIN OpenVPN Static key/,$ p' /etc/openvpn/server/tc.key
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echo "</tls-crypt>"
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} > "$script_dir"/"$client".ovpn
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}
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if [[ ! -e /etc/openvpn/server/server.conf ]]; then
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# Detect minimal setups where neither wget nor curl are installed
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if ! hash wget 2>/dev/null && ! hash curl 2>/dev/null; then
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echo "Wget is required to use this installer."
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read -n1 -r -p "Press any key to install Wget and continue..."
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apt-get update
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apt-get install -y wget
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fi
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clear
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echo 'Welcome to this OpenVPN road warrior installer!'
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# Choose IPv4 address (if only one exists, it is selected automatically)
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if [[ $(ip -4 addr | grep inet | grep -vEc '127(\.[0-9]{1,3}){3}') -eq 1 ]]; then
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ip=$(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}')
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else
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number_of_ip=$(ip -4 addr | grep inet | grep -vEc '127(\.[0-9]{1,3}){3}')
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echo
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echo "Which IPv4 address should be used?"
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ip -4 addr | grep inet | grep -vE '127(\.[0-9]{1,3}){3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | nl -s ') '
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read -p "IPv4 address [1]: " ip_number
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until [[ -z "$ip_number" || "$ip_number" =~ ^[0-9]+$ && "$ip_number" -le "$number_of_ip" ]]; do
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echo "$ip_number: invalid selection."
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read -p "IPv4 address [1]: " ip_number
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done
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[[ -z "$ip_number" ]] && ip_number="1"
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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)
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fi
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# If $ip is private, ask for public IP or hostname
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if echo "$ip" | grep -qE '^(10\.|172\.1[6789]\.|172\.2[0-9]\.|172\.3[01]\.|192\.168)'; then
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echo
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echo "This server is behind NAT. What is the public IPv4 address or hostname?"
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get_public_ip=$(grep -m 1 -oE '^[0-9]{1,3}(\.[0-9]{1,3}){3}$' <<< "$(wget -T 10 -t 1 -4qO- "http://ip1.dynupdate.no-ip.com/" || curl -m 10 -4Ls "http://ip1.dynupdate.no-ip.com/")")
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read -p "Public IPv4 address / hostname [$get_public_ip]: " public_ip
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until [[ -n "$get_public_ip" || -n "$public_ip" ]]; do
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echo "Invalid input."
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read -p "Public IPv4 address / hostname: " public_ip
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done
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[[ -z "$public_ip" ]] && public_ip="$get_public_ip"
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fi
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# Determine IPv6 address if available
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if [[ $(ip -6 addr | grep -c 'inet6 [23]') -eq 1 ]]; then
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ip6=$(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}')
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fi
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if [[ $(ip -6 addr | grep -c 'inet6 [23]') -gt 1 ]]; then
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number_of_ip6=$(ip -6 addr | grep -c 'inet6 [23]')
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echo
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echo "Which IPv6 address should be used?"
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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 ') '
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read -p "IPv6 address [1]: " ip6_number
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until [[ -z "$ip6_number" || "$ip6_number" =~ ^[0-9]+$ && "$ip6_number" -le "$number_of_ip6" ]]; do
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echo "$ip6_number: invalid selection."
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read -p "IPv6 address [1]: " ip6_number
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done
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[[ -z "$ip6_number" ]] && ip6_number="1"
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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)
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fi
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echo
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echo "Which protocol should OpenVPN use?"
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echo " 1) UDP (recommended)"
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echo " 2) TCP"
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read -p "Protocol [1]: " protocol
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until [[ -z "$protocol" || "$protocol" =~ ^[12]$ ]]; do
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echo "$protocol: invalid selection."
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read -p "Protocol [1]: " protocol
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done
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case "$protocol" in
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1|"")
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protocol=udp
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;;
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2)
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protocol=tcp
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;;
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esac
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echo
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echo "What port should OpenVPN listen on?"
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read -p "Port [1194]: " port
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until [[ -z "$port" || "$port" =~ ^[0-9]+$ && "$port" -le 65535 ]]; do
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echo "$port: invalid port."
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read -p "Port [1194]: " port
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done
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[[ -z "$port" ]] && port="1194"
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echo
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echo "Select a DNS server for the clients:"
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echo " 1) Default system resolvers"
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echo " 2) Google"
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echo " 3) 1.1.1.1"
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echo " 4) OpenDNS"
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echo " 5) Quad9"
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echo " 6) AdGuard"
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echo " 7) Specify custom resolvers"
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read -p "DNS server [1]: " dns
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until [[ -z "$dns" || "$dns" =~ ^[1-7]$ ]]; do
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echo "$dns: invalid selection."
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read -p "DNS server [1]: " dns
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done
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if [[ "$dns" = "7" ]]; then
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echo
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until [[ -n "$custom_dns" ]]; do
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echo "Enter DNS servers (one or more IPv4 addresses, separated by commas or spaces):"
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read -p "DNS servers: " dns_input
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dns_input=$(echo "$dns_input" | tr ',' ' ')
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for dns_ip in $dns_input; do
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if [[ "$dns_ip" =~ ^[0-9]{1,3}(\.[0-9]{1,3}){3}$ ]]; then
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if [[ -z "$custom_dns" ]]; then
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custom_dns="$dns_ip"
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else
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custom_dns="$custom_dns $dns_ip"
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fi
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fi
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done
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if [ -z "$custom_dns" ]; then
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echo "Invalid input."
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fi
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done
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fi
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echo
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echo "Enter a name for the first client:"
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read -p "Name [client]: " unsanitized_client
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client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
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[[ -z "$client" ]] && client="client"
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echo
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echo "OpenVPN installation is ready to begin."
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# Install firewall package if necessary
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if ! systemctl is-active --quiet firewalld.service && ! hash iptables 2>/dev/null; then
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if [[ "$os" == "centos" || "$os" == "fedora" ]]; then
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firewall="firewalld"
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echo "firewalld, which is required to manage routing tables, will also be installed."
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elif [[ "$os" == "debian" || "$os" == "ubuntu" ]]; then
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firewall="iptables"
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fi
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fi
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read -n1 -r -p "Press any key to continue..."
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# If running inside a container, disable LimitNPROC to prevent conflicts
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if systemd-detect-virt -cq; then
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mkdir /etc/systemd/system/openvpn-server@server.service.d/ 2>/dev/null
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echo "[Service]
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LimitNPROC=infinity" > /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
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fi
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# Install OpenVPN and prerequisites
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if [[ "$os" = "debian" || "$os" = "ubuntu" ]]; then
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apt-get update
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apt-get install -y --no-install-recommends openvpn openssl ca-certificates $firewall
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elif [[ "$os" = "centos" ]]; then
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dnf install -y epel-release
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dnf install -y openvpn openssl ca-certificates tar $firewall
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else
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dnf install -y openvpn openssl ca-certificates tar $firewall
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fi
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if [[ "$firewall" == "firewalld" ]]; then
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systemctl enable --now firewalld.service
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fi
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# Get EasyRSA: Create the directory and extract EasyRSA files
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easy_rsa_url='https://github.com/OpenVPN/easy-rsa/releases/download/v3.2.2/EasyRSA-3.2.2.tgz'
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mkdir -p /etc/openvpn/server/easy-rsa/
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{ wget -qO- "$easy_rsa_url" 2>/dev/null || curl -sL "$easy_rsa_url" ; } | tar xz -C /etc/openvpn/server/easy-rsa/ --strip-components=1
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chown -R root:root /etc/openvpn/server/easy-rsa/
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cd /etc/openvpn/server/easy-rsa/
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# Create the PKI, set up the CA, and generate server and client certificates
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./easyrsa --batch init-pki
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./easyrsa --batch build-ca nopass
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./easyrsa --batch --days=3650 build-server-full server nopass
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./easyrsa --batch --days=3650 build-client-full "$client" nopass
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./easyrsa --batch --days=3650 gen-crl
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# Move necessary files to /etc/openvpn/server
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cp pki/ca.crt pki/private/ca.key pki/issued/server.crt pki/private/server.key pki/crl.pem /etc/openvpn/server
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chown nobody:"$group_name" /etc/openvpn/server/crl.pem
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chmod o+x /etc/openvpn/server/
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# Generate key for tls-crypt
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openvpn --genkey secret /etc/openvpn/server/tc.key
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# Create the DH parameters file using ffdhe2048
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echo '-----BEGIN DH PARAMETERS-----
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MIIBCAKCAQEA//////////+t+FRYortKmq/cViAnPTzx2LnFg84tNpWp4TZBFGQz
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+8yTnc4kmz75fS/jY2MMddj2gbICrsRhetPfHtXV/WVhJDP1H18GbtCFY2VVPe0a
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87VXE15/V8k1mE8McODmi3fipona8+/och3xWKE2rec1MKzKT0g6eXq8CrGCsyT7
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YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi
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7MA0BM0oNC9hkXL+nOmFg/+OTxIy7vKBg8P+OxtMb61zO7X8vC7CIAXFjvGDfRaD
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ssbzSibBsu/6iGtCOGEoXJf//////////wIBAg==
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-----END DH PARAMETERS-----' > /etc/openvpn/server/dh.pem
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# Generate server.conf
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echo "local $ip
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port $port
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proto $protocol
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dev tun
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ca ca.crt
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cert server.crt
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key server.key
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dh dh.pem
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auth SHA512
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tls-crypt tc.key
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topology subnet
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server 10.8.0.0 255.255.255.0" > /etc/openvpn/server/server.conf
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if [[ -z "$ip6" ]]; then
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echo 'push "redirect-gateway def1 bypass-dhcp"' >> /etc/openvpn/server/server.conf
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else
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echo 'server-ipv6 fddd:1194:1194:1194::/64' >> /etc/openvpn/server/server.conf
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echo 'push "redirect-gateway def1 ipv6 bypass-dhcp"' >> /etc/openvpn/server/server.conf
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fi
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echo 'ifconfig-pool-persist ipp.txt' >> /etc/openvpn/server/server.conf
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# DNS configuration
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case "$dns" in
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1|"")
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if grep '^nameserver' "/etc/resolv.conf" | grep -qv '127.0.0.53' ; then
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resolv_conf="/etc/resolv.conf"
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else
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resolv_conf="/run/systemd/resolve/resolv.conf"
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fi
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grep -v '^#\|^;' "$resolv_conf" | grep '^nameserver' | grep -v '127.0.0.53' | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | while read line; do
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echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server/server.conf
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done
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;;
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2)
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echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server/server.conf
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echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server/server.conf
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;;
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3)
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echo 'push "dhcp-option DNS 1.1.1.1"' >> /etc/openvpn/server/server.conf
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echo 'push "dhcp-option DNS 1.0.0.1"' >> /etc/openvpn/server/server.conf
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;;
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4)
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echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server/server.conf
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echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server/server.conf
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;;
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5)
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echo 'push "dhcp-option DNS 9.9.9.9"' >> /etc/openvpn/server/server.conf
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echo 'push "dhcp-option DNS 149.112.112.112"' >> /etc/openvpn/server/server.conf
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;;
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6)
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echo 'push "dhcp-option DNS 94.140.14.14"' >> /etc/openvpn/server/server.conf
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echo 'push "dhcp-option DNS 94.140.15.15"' >> /etc/openvpn/server/server.conf
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;;
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7)
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for dns_ip in $custom_dns; do
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echo "push \"dhcp-option DNS $dns_ip\"" >> /etc/openvpn/server/server.conf
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done
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;;
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esac
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echo 'push "block-outside-dns"' >> /etc/openvpn/server/server.conf
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echo "keepalive 10 120
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user nobody
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group $group_name
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persist-key
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persist-tun
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verb 3
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crl-verify crl.pem" >> /etc/openvpn/server/server.conf
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if [[ "$protocol" = "udp" ]]; then
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echo "explicit-exit-notify" >> /etc/openvpn/server/server.conf
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fi
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echo 'net.ipv4.ip_forward=1' > /etc/sysctl.d/99-openvpn-forward.conf
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echo 1 > /proc/sys/net/ipv4/ip_forward
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if [[ -n "$ip6" ]]; then
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echo "net.ipv6.conf.all.forwarding=1" >> /etc/sysctl.d/99-openvpn-forward.conf
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echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
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fi
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if systemctl is-active --quiet firewalld.service; then
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firewall-cmd --add-port="$port"/"$protocol"
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firewall-cmd --zone=trusted --add-source=10.8.0.0/24
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firewall-cmd --permanent --add-port="$port"/"$protocol"
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firewall-cmd --permanent --zone=trusted --add-source=10.8.0.0/24
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firewall-cmd --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to "$ip"
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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 "$ip"
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if [[ -n "$ip6" ]]; then
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firewall-cmd --zone=trusted --add-source=fddd:1194:1194:1194::/64
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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
|
|
iptables_path=$(command -v iptables)
|
|
ip6tables_path=$(command -v ip6tables)
|
|
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
|
|
read -p "Enter allowed subnets for VPN access (separated by spaces or commas): " allowed_input
|
|
allowed_subnets=$(echo "$allowed_input" | tr ',' ' ' | xargs)
|
|
echo "Allowed subnets: $allowed_subnets"
|
|
custom_rules=""
|
|
for subnet in $allowed_subnets; do
|
|
custom_rules="${custom_rules}\nExecStart=${iptables_path} -w 5 -A VPN_FILTER -d ${subnet} -j ACCEPT"
|
|
done
|
|
cat <<EOF > /etc/systemd/system/openvpn-iptables.service
|
|
[Unit]
|
|
After=network-online.target
|
|
Wants=network-online.target
|
|
|
|
[Service]
|
|
Type=oneshot
|
|
RemainAfterExit=yes
|
|
ExecStart=${iptables_path} -w 5 -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to ${ip}
|
|
ExecStart=${iptables_path} -w 5 -I INPUT -p ${protocol} --dport ${port} -j ACCEPT
|
|
ExecStart=${iptables_path} -w 5 -I FORWARD -s 10.8.0.0/24 -j ACCEPT
|
|
ExecStart=${iptables_path} -w 5 -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
|
|
ExecStart=-${iptables_path} -w 5 -N VPN_FILTER
|
|
ExecStart=${iptables_path} -w 5 -A VPN_FILTER -m state --state RELATED,ESTABLISHED -j ACCEPT
|
|
ExecStart=${iptables_path} -w 5 -A VPN_FILTER -p tcp -m multiport --dports 22,80,443,8000,9000,8001,8002 -j ACCEPT
|
|
ExecStart=${iptables_path} -w 5 -A VPN_FILTER -p udp --dport 1195 -j ACCEPT
|
|
$custom_rules
|
|
ExecStart=${iptables_path} -w 5 -I FORWARD -s 10.8.0.0/24 -j VPN_FILTER
|
|
ExecStart=${iptables_path} -w 5 -A VPN_FILTER -j DROP
|
|
ExecStop=${iptables_path} -w 5 -t nat -D POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to ${ip}
|
|
ExecStop=${iptables_path} -w 5 -D INPUT -p ${protocol} --dport ${port} -j ACCEPT
|
|
ExecStop=${iptables_path} -w 5 -D FORWARD -s 10.8.0.0/24 -j ACCEPT
|
|
ExecStop=${iptables_path} -w 5 -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
|
|
ExecStop=${iptables_path} -w 5 -F VPN_FILTER
|
|
ExecStop=${iptables_path} -w 5 -X VPN_FILTER
|
|
EOF
|
|
if [[ -n "$ip6" ]]; then
|
|
cat <<EOF >> /etc/systemd/system/openvpn-iptables.service
|
|
ExecStart=${ip6tables_path} -w 5 -t nat -A POSTROUTING -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to ${ip6}
|
|
ExecStart=${ip6tables_path} -w 5 -I FORWARD -s fddd:1194:1194:1194::/64 -j ACCEPT
|
|
ExecStart=${ip6tables_path} -w 5 -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
|
|
ExecStop=${ip6tables_path} -w 5 -t nat -D POSTROUTING -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to ${ip6}
|
|
ExecStop=${ip6tables_path} -w 5 -D FORWARD -s fddd:1194:1194:1194::/64 -j ACCEPT
|
|
ExecStop=${ip6tables_path} -w 5 -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
|
|
EOF
|
|
fi
|
|
cat <<EOF >> /etc/systemd/system/openvpn-iptables.service
|
|
[Install]
|
|
WantedBy=multi-user.target
|
|
EOF
|
|
systemctl enable --now openvpn-iptables.service
|
|
fi
|
|
|
|
if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$port" != 1194 ]]; then
|
|
if ! hash semanage 2>/dev/null; then
|
|
dnf install -y policycoreutils-python-utils
|
|
fi
|
|
semanage port -a -t openvpn_port_t -p "$protocol" "$port"
|
|
fi
|
|
|
|
[[ -n "$public_ip" ]] && ip="$public_ip"
|
|
echo "client
|
|
dev tun
|
|
proto $protocol
|
|
remote $ip $port
|
|
resolv-retry infinite
|
|
nobind
|
|
persist-key
|
|
persist-tun
|
|
remote-cert-tls server
|
|
auth SHA512
|
|
ignore-unknown-option block-outside-dns
|
|
verb 3" > /etc/openvpn/server/client-common.txt
|
|
systemctl enable --now openvpn-server@server.service
|
|
new_client
|
|
echo
|
|
echo "Finished!"
|
|
echo
|
|
echo "The client configuration is available in:" "$script_dir"/"$client.ovpn"
|
|
echo "New clients can be added by running this script again."
|
|
else
|
|
clear
|
|
echo "OpenVPN is already installed."
|
|
echo
|
|
echo "Select an option:"
|
|
echo " 1) Add a new client"
|
|
echo " 2) Revoke an existing client"
|
|
echo " 3) Remove OpenVPN"
|
|
echo " 4) Exit"
|
|
read -p "Option: " option
|
|
until [[ "$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' <<< "$unsanitized_client")
|
|
done
|
|
cd /etc/openvpn/server/easy-rsa/
|
|
./easyrsa --batch --days=3650 build-client-full "$client" nopass
|
|
new_client
|
|
echo
|
|
echo "$client added. Configuration available in:" "$script_dir"/"$client.ovpn"
|
|
exit
|
|
;;
|
|
2)
|
|
number_of_clients=$(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 "$client"
|
|
./easyrsa --batch --days=3650 gen-crl
|
|
rm -f /etc/openvpn/server/crl.pem
|
|
rm -f /etc/openvpn/server/easy-rsa/pki/reqs/"$client".req
|
|
rm -f /etc/openvpn/server/easy-rsa/pki/private/"$client".key
|
|
cp /etc/openvpn/server/easy-rsa/pki/crl.pem /etc/openvpn/server/crl.pem
|
|
chown nobody:"$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=$(firewall-cmd --direct --get-rules ipv4 nat POSTROUTING | grep '\-s 10.8.0.0/24 '"'"'!'"'"' -d 10.8.0.0/24' | grep -oE '[^ ]+$')
|
|
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
|
|
dnf 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
|