From 0b89cec77a4b6158228400c857fcc8fc01a3ad5c Mon Sep 17 00:00:00 2001
From: "@bl4ckarch" <62140530+bl4ckarch@users.noreply.github.com>
Date: Wed, 26 Mar 2025 14:56:09 +0100
Subject: [PATCH] feat(openvpn): add interactive subnet prompt in firewall
config
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.
---
openvpn-install.sh | 995 ++++++++++++++++++++++-----------------------
1 file changed, 494 insertions(+), 501 deletions(-)
diff --git a/openvpn-install.sh b/openvpn-install.sh
index 0b8e93d..2ca1f76 100644
--- a/openvpn-install.sh
+++ b/openvpn-install.sh
@@ -3,288 +3,283 @@
# 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
+ echo 'This installer needs to be run with "bash", not "sh".'
+ exit
fi
# Discard stdin. Needed when running from a one-liner which includes a newline
read -N 999999 -t 0.001
-# Detect OS
-# $os_version variables aren't always in use, but are kept here for convenience
+# Detect OS (with some variables kept for convenience)
if grep -qs "ubuntu" /etc/os-release; then
- os="ubuntu"
- os_version=$(grep 'VERSION_ID' /etc/os-release | cut -d '"' -f 2 | tr -d '.')
- group_name="nogroup"
+ 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"
+ 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"
+ 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"
+ os="fedora"
+ os_version=$(grep -oE '[0-9]+' /etc/fedora-release | head -1)
+ group_name="nobody"
else
- echo "This installer seems to be running on an unsupported distribution.
+ echo "This installer seems to be running on an unsupported distribution.
Supported distros are Ubuntu, Debian, AlmaLinux, Rocky Linux, CentOS and Fedora."
- exit
+ exit
fi
if [[ "$os" == "ubuntu" && "$os_version" -lt 2204 ]]; then
- echo "Ubuntu 22.04 or higher is required to use this installer.
+ echo "Ubuntu 22.04 or higher is required to use this installer.
This version of Ubuntu is too old and unsupported."
- exit
+ exit
fi
if [[ "$os" == "debian" ]]; then
- if grep -q '/sid' /etc/debian_version; then
- echo "Debian Testing and Debian Unstable are unsupported by this installer."
- exit
- fi
- if [[ "$os_version" -lt 11 ]]; then
- echo "Debian 11 or higher is required to use this installer.
+ if grep -q '/sid' /etc/debian_version; then
+ echo "Debian Testing and Debian Unstable are unsupported by this installer."
+ exit
+ fi
+ if [[ "$os_version" -lt 11 ]]; then
+ echo "Debian 11 or higher is required to use this installer.
This version of Debian is too old and unsupported."
- exit
- fi
+ exit
+ fi
fi
if [[ "$os" == "centos" && "$os_version" -lt 9 ]]; then
- os_name=$(sed 's/ release.*//' /etc/almalinux-release /etc/rocky-release /etc/centos-release 2>/dev/null | head -1)
- echo "$os_name 9 or higher is required to use this installer.
+ os_name=$(sed 's/ release.*//' /etc/almalinux-release /etc/rocky-release /etc/centos-release 2>/dev/null | head -1)
+ echo "$os_name 9 or higher is required to use this installer.
This version of $os_name is too old and unsupported."
- exit
+ exit
fi
# Detect environments where $PATH does not include the sbin directories
if ! grep -q sbin <<< "$PATH"; then
- echo '$PATH does not include sbin. Try using "su -" instead of "su".'
- exit
+ echo '$PATH does not include sbin. Try using "su -" instead of "su".'
+ exit
fi
if [[ "$EUID" -ne 0 ]]; then
- echo "This installer needs to be run with superuser privileges."
- exit
+ echo "This installer needs to be run with superuser privileges."
+ exit
fi
if [[ ! -e /dev/net/tun ]] || ! ( exec 7<>/dev/net/tun ) 2>/dev/null; then
- echo "The system does not have the TUN device available.
+ echo "The system does not have the TUN device available.
TUN needs to be enabled before running this installer."
- exit
+ exit
fi
# Store the absolute path of the directory where the script is located
script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
new_client () {
- # Generates the custom client.ovpn
- {
- cat /etc/openvpn/server/client-common.txt
- echo ""
- cat /etc/openvpn/server/easy-rsa/pki/ca.crt
- echo ""
- echo ""
- sed -ne '/BEGIN CERTIFICATE/,$ p' /etc/openvpn/server/easy-rsa/pki/issued/"$client".crt
- echo ""
- echo ""
- cat /etc/openvpn/server/easy-rsa/pki/private/"$client".key
- echo ""
- echo ""
- sed -ne '/BEGIN OpenVPN Static key/,$ p' /etc/openvpn/server/tc.key
- echo ""
- } > "$script_dir"/"$client".ovpn
+ # Generates the custom client.ovpn
+ {
+ cat /etc/openvpn/server/client-common.txt
+ echo ""
+ cat /etc/openvpn/server/easy-rsa/pki/ca.crt
+ echo ""
+ echo ""
+ sed -ne '/BEGIN CERTIFICATE/,$ p' /etc/openvpn/server/easy-rsa/pki/issued/"$client".crt
+ echo ""
+ echo ""
+ cat /etc/openvpn/server/easy-rsa/pki/private/"$client".key
+ echo ""
+ echo ""
+ sed -ne '/BEGIN OpenVPN Static key/,$ p' /etc/openvpn/server/tc.key
+ echo ""
+ } > "$script_dir"/"$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 on?"
- 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 "$port" ]] && port="1194"
- echo
- echo "Select a DNS server for the clients:"
- echo " 1) Default system resolvers"
- echo " 2) Google"
- echo " 3) 1.1.1.1"
- echo " 4) OpenDNS"
- echo " 5) Quad9"
- echo " 6) AdGuard"
- echo " 7) Specify custom resolvers"
- read -p "DNS server [1]: " dns
- until [[ -z "$dns" || "$dns" =~ ^[1-7]$ ]]; do
- echo "$dns: invalid selection."
- read -p "DNS server [1]: " dns
- done
- # If the user selected custom resolvers, we deal with that here
- if [[ "$dns" = "7" ]]; then
- echo
- until [[ -n "$custom_dns" ]]; do
- echo "Enter DNS servers (one or more IPv4 addresses, separated by commas or spaces):"
- read -p "DNS servers: " dns_input
- # Convert comma delimited to space delimited
- dns_input=$(echo "$dns_input" | tr ',' ' ')
- # Validate and build custom DNS IP list
- for dns_ip in $dns_input; do
- if [[ "$dns_ip" =~ ^[0-9]{1,3}(\.[0-9]{1,3}){3}$ ]]; then
- if [[ -z "$custom_dns" ]]; then
- custom_dns="$dns_ip"
- else
- custom_dns="$custom_dns $dns_ip"
- fi
- fi
- done
- if [ -z "$custom_dns" ]; then
- echo "Invalid input."
- fi
- done
- fi
- 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]
+ # Detect 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!'
+ # Choose IPv4 address (if only one exists, 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
+ 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 $ip is private, ask for public IP or hostname
+ if echo "$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=$(grep -m 1 -oE '^[0-9]{1,3}(\.[0-9]{1,3}){3}$' <<< "$(wget -T 10 -t 1 -4qO- "http://ip1.dynupdate.no-ip.com/" || curl -m 10 -4Ls "http://ip1.dynupdate.no-ip.com/")")
+ read -p "Public IPv4 address / hostname [$get_public_ip]: " public_ip
+ 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
+ # Determine IPv6 address if available
+ 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 [[ $(ip -6 addr | grep -c 'inet6 [23]') -gt 1 ]]; then
+ number_of_ip6=$(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 on?"
+ 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 "$port" ]] && port="1194"
+ echo
+ echo "Select a DNS server for the clients:"
+ echo " 1) Default system resolvers"
+ echo " 2) Google"
+ echo " 3) 1.1.1.1"
+ echo " 4) OpenDNS"
+ echo " 5) Quad9"
+ echo " 6) AdGuard"
+ echo " 7) Specify custom resolvers"
+ read -p "DNS server [1]: " dns
+ until [[ -z "$dns" || "$dns" =~ ^[1-7]$ ]]; do
+ echo "$dns: invalid selection."
+ read -p "DNS server [1]: " dns
+ done
+ if [[ "$dns" = "7" ]]; then
+ echo
+ until [[ -n "$custom_dns" ]]; do
+ echo "Enter DNS servers (one or more IPv4 addresses, separated by commas or spaces):"
+ read -p "DNS servers: " dns_input
+ dns_input=$(echo "$dns_input" | tr ',' ' ')
+ for dns_ip in $dns_input; do
+ if [[ "$dns_ip" =~ ^[0-9]{1,3}(\.[0-9]{1,3}){3}$ ]]; then
+ if [[ -z "$custom_dns" ]]; then
+ custom_dns="$dns_ip"
+ else
+ custom_dns="$custom_dns $dns_ip"
+ fi
+ fi
+ done
+ if [ -z "$custom_dns" ]; then
+ echo "Invalid input."
+ fi
+ done
+ fi
+ echo
+ echo "Enter a name for the first client:"
+ read -p "Name [client]: " unsanitized_client
+ client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
+ [[ -z "$client" ]] && client="client"
+ echo
+ echo "OpenVPN installation is ready to begin."
+
+ # Install firewall package if necessary
+ if ! systemctl is-active --quiet firewalld.service && ! hash iptables 2>/dev/null; then
+ if [[ "$os" == "centos" || "$os" == "fedora" ]]; then
+ firewall="firewalld"
+ echo "firewalld, which is required to manage routing tables, will also be installed."
+ elif [[ "$os" == "debian" || "$os" == "ubuntu" ]]; then
+ firewall="iptables"
+ fi
+ fi
+ read -n1 -r -p "Press any key to continue..."
+
+ # If running inside a container, disable LimitNPROC to prevent conflicts
+ if systemd-detect-virt -cq; then
+ mkdir /etc/systemd/system/openvpn-server@server.service.d/ 2>/dev/null
+ echo "[Service]
LimitNPROC=infinity" > /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
- fi
- if [[ "$os" = "debian" || "$os" = "ubuntu" ]]; then
- apt-get update
- apt-get install -y --no-install-recommends openvpn openssl ca-certificates $firewall
- elif [[ "$os" = "centos" ]]; then
- dnf install -y epel-release
- dnf 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/v3.2.2/EasyRSA-3.2.2.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 --batch init-pki
- ./easyrsa --batch build-ca nopass
- ./easyrsa --batch --days=3650 build-server-full server nopass
- ./easyrsa --batch --days=3650 build-client-full "$client" nopass
- ./easyrsa --batch --days=3650 gen-crl
- # Move the stuff we need
- cp pki/ca.crt pki/private/ca.key pki/issued/server.crt pki/private/server.key pki/crl.pem /etc/openvpn/server
- # CRL is read with each client connection, while OpenVPN is dropped to nobody
- chown nobody:"$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-----
+ fi
+
+ # Install OpenVPN and prerequisites
+ if [[ "$os" = "debian" || "$os" = "ubuntu" ]]; then
+ apt-get update
+ apt-get install -y --no-install-recommends openvpn openssl ca-certificates $firewall
+ elif [[ "$os" = "centos" ]]; then
+ dnf install -y epel-release
+ dnf install -y openvpn openssl ca-certificates tar $firewall
+ else
+ dnf install -y openvpn openssl ca-certificates tar $firewall
+ fi
+
+ if [[ "$firewall" == "firewalld" ]]; then
+ systemctl enable --now firewalld.service
+ fi
+
+ # Get EasyRSA: Create the directory and extract EasyRSA files
+ easy_rsa_url='https://github.com/OpenVPN/easy-rsa/releases/download/v3.2.2/EasyRSA-3.2.2.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 generate server and client certificates
+ ./easyrsa --batch init-pki
+ ./easyrsa --batch build-ca nopass
+ ./easyrsa --batch --days=3650 build-server-full server nopass
+ ./easyrsa --batch --days=3650 build-client-full "$client" nopass
+ ./easyrsa --batch --days=3650 gen-crl
+
+ # Move necessary files to /etc/openvpn/server
+ cp pki/ca.crt pki/private/ca.key pki/issued/server.crt pki/private/server.key pki/crl.pem /etc/openvpn/server
+ chown nobody:"$group_name" /etc/openvpn/server/crl.pem
+ 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 ffdhe2048
+ echo '-----BEGIN DH PARAMETERS-----
MIIBCAKCAQEA//////////+t+FRYortKmq/cViAnPTzx2LnFg84tNpWp4TZBFGQz
+8yTnc4kmz75fS/jY2MMddj2gbICrsRhetPfHtXV/WVhJDP1H18GbtCFY2VVPe0a
87VXE15/V8k1mE8McODmi3fipona8+/och3xWKE2rec1MKzKT0g6eXq8CrGCsyT7
@@ -292,8 +287,9 @@ YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi
7MA0BM0oNC9hkXL+nOmFg/+OTxIy7vKBg8P+OxtMb61zO7X8vC7CIAXFjvGDfRaD
ssbzSibBsu/6iGtCOGEoXJf//////////wIBAg==
-----END DH PARAMETERS-----' > /etc/openvpn/server/dh.pem
- # Generate server.conf
- echo "local $ip
+
+ # Generate server.conf
+ echo "local $ip
port $port
proto $protocol
dev tun
@@ -305,142 +301,147 @@ auth SHA512
tls-crypt tc.key
topology subnet
server 10.8.0.0 255.255.255.0" > /etc/openvpn/server/server.conf
- # IPv6
- if [[ -z "$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 "$dns" in
- 1|"")
- # Locate the proper resolv.conf
- # Needed for systems running systemd-resolved
- if grep '^nameserver' "/etc/resolv.conf" | grep -qv '127.0.0.53' ; then
- resolv_conf="/etc/resolv.conf"
- else
- resolv_conf="/run/systemd/resolve/resolv.conf"
- fi
- # Obtain the resolvers from resolv.conf and use them for OpenVPN
- grep -v '^#\|^;' "$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
- 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
- ;;
- 7)
- for dns_ip in $custom_dns; do
- echo "push \"dhcp-option DNS $dns_ip\"" >> /etc/openvpn/server/server.conf
- done
- ;;
- esac
- echo 'push "block-outside-dns"' >> /etc/openvpn/server/server.conf
- echo "keepalive 10 120
+ if [[ -z "$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 configuration
+ case "$dns" in
+ 1|"")
+ if grep '^nameserver' "/etc/resolv.conf" | grep -qv '127.0.0.53' ; then
+ resolv_conf="/etc/resolv.conf"
+ else
+ resolv_conf="/run/systemd/resolve/resolv.conf"
+ fi
+ grep -v '^#\|^;' "$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
+ 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
+ ;;
+ 7)
+ for dns_ip in $custom_dns; do
+ echo "push \"dhcp-option DNS $dns_ip\"" >> /etc/openvpn/server/server.conf
+ done
+ ;;
+ esac
+ echo 'push "block-outside-dns"' >> /etc/openvpn/server/server.conf
+ echo "keepalive 10 120
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]
+ if [[ "$protocol" = "udp" ]]; then
+ echo "explicit-exit-notify" >> /etc/openvpn/server/server.conf
+ fi
+ echo 'net.ipv4.ip_forward=1' > /etc/sysctl.d/99-openvpn-forward.conf
+ echo 1 > /proc/sys/net/ipv4/ip_forward
+ if [[ -n "$ip6" ]]; then
+ echo "net.ipv6.conf.all.forwarding=1" >> /etc/sysctl.d/99-openvpn-forward.conf
+ echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
+ fi
+ if systemctl is-active --quiet firewalld.service; then
+ 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
+ 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 "$ip6"
+ fi
+ else
+ iptables_path=$(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 ${subnet} -j ACCEPT"
+ done
+ cat < /etc/systemd/system/openvpn-iptables.service
+[Unit]
After=network-online.target
Wants=network-online.target
+
[Service]
Type=oneshot
-ExecStart=$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=$iptables_path -w 5 -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
-ExecStop=$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=$iptables_path -w 5 -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" > /etc/systemd/system/openvpn-iptables.service
- if [[ -n "$ip6" ]]; then
- echo "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=$ip6tables_path -w 5 -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" >> /etc/systemd/system/openvpn-iptables.service
- fi
- echo "RemainAfterExit=yes
+RemainAfterExit=yes
+ExecStart=${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 <> /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=${ip6tables_path} -w 5 -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
+EOF
+ fi
+ cat <> /etc/systemd/system/openvpn-iptables.service
[Install]
-WantedBy=multi-user.target" >> /etc/systemd/system/openvpn-iptables.service
- systemctl enable --now openvpn-iptables.service
- fi
- # If SELinux is enabled and a custom port was selected, we need this
- if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$port" != 1194 ]]; then
- # Install semanage if not already present
- if ! hash semanage 2>/dev/null; then
- dnf install -y policycoreutils-python-utils
- 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
+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 $port
@@ -452,144 +453,136 @@ remote-cert-tls server
auth SHA512
ignore-unknown-option block-outside-dns
verb 3" > /etc/openvpn/server/client-common.txt
- # Enable and start the OpenVPN service
- systemctl enable --now openvpn-server@server.service
- # Generates the custom client.ovpn
- new_client
- echo
- echo "Finished!"
- echo
- echo "The client configuration is available in:" "$script_dir"/"$client.ovpn"
- echo "New clients can be added by running this script again."
+ systemctl enable --now openvpn-server@server.service
+ new_client
+ echo
+ echo "Finished!"
+ echo
+ echo "The client configuration is available in:" "$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
- # Generates the custom client.ovpn
- new_client
- echo
- echo "$client added. Configuration available in:" "$script_dir"/"$client.ovpn"
- exit
- ;;
- 2)
- # This option could be documented a bit better and maybe even be simplified
- # ...but what can I say, I want some sleep too
- number_of_clients=$(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 "$client"
- ./easyrsa --batch --days=3650 gen-crl
- rm -f /etc/openvpn/server/crl.pem
- rm -f /etc/openvpn/server/easy-rsa/pki/reqs/"$client".req
- rm -f /etc/openvpn/server/easy-rsa/pki/private/"$client".key
- cp /etc/openvpn/server/easy-rsa/pki/crl.pem /etc/openvpn/server/crl.pem
- # CRL is read with each client connection, when OpenVPN is dropped to nobody
- chown nobody:"$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" || "$os" = "ubuntu" ]]; then
- rm -rf /etc/openvpn/server
- apt-get remove --purge -y openvpn
- else
- # Else, OS must be CentOS or Fedora
- dnf remove -y openvpn
- rm -rf /etc/openvpn/server
- fi
- echo
- echo "OpenVPN removed!"
- else
- echo
- echo "OpenVPN removal aborted!"
- fi
- exit
- ;;
- 4)
- exit
- ;;
- esac
+ clear
+ echo "OpenVPN is already installed."
+ echo
+ echo "Select an option:"
+ echo " 1) Add a new client"
+ echo " 2) Revoke an existing client"
+ echo " 3) Remove OpenVPN"
+ echo " 4) Exit"
+ read -p "Option: " option
+ until [[ "$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