mirror of
https://github.com/hwdsl2/openvpn-install.git
synced 2024-07-02 17:55:47 +02:00
c1e9ebd446
- Apply upstream change Nyr/openvpn-install commit f943387, with enhancements. - --no-install-recommends is now required for Debian. - Cleanup
930 lines
32 KiB
Bash
930 lines
32 KiB
Bash
#!/bin/bash
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#
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# https://github.com/hwdsl2/openvpn-install
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#
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# Based on the work of Nyr and contributors at:
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# https://github.com/Nyr/openvpn-install
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#
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# Copyright (c) 2022 Lin Song <linsongui@gmail.com>
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# Copyright (c) 2013-2022 Nyr
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#
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# Released under the MIT License, see the accompanying file LICENSE.txt
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# or https://opensource.org/licenses/MIT
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exiterr() { echo "Error: $1" >&2; exit 1; }
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exiterr2() { exiterr "'apt-get install' failed."; }
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exiterr3() { exiterr "'yum install' failed."; }
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check_ip() {
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IP_REGEX='^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$'
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printf '%s' "$1" | tr -d '\n' | grep -Eq "$IP_REGEX"
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}
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abort_and_exit() {
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echo "Abort. No changes were made." >&2
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exit 1
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}
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get_export_dir() {
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export_to_home_dir=0
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export_dir=~/
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if [ -n "$SUDO_USER" ] && getent group "$SUDO_USER" >/dev/null 2>&1; then
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user_home_dir=$(getent passwd "$SUDO_USER" 2>/dev/null | cut -d: -f6)
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if [ -d "$user_home_dir" ] && [ "$user_home_dir" != "/" ]; then
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export_dir="$user_home_dir/"
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export_to_home_dir=1
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fi
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fi
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}
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find_public_ip() {
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ip_url1="http://ipv4.icanhazip.com"
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ip_url2="http://ip1.dynupdate.no-ip.com"
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# Get public IP and sanitize with grep
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get_public_ip=$(grep -m 1 -oE '^[0-9]{1,3}(\.[0-9]{1,3}){3}$' <<< "$(wget -T 10 -t 1 -4qO- "$ip_url1" || curl -m 10 -4Ls "$ip_url1")")
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if ! check_ip "$get_public_ip"; then
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get_public_ip=$(grep -m 1 -oE '^[0-9]{1,3}(\.[0-9]{1,3}){3}$' <<< "$(wget -T 10 -t 1 -4qO- "$ip_url2" || curl -m 10 -4Ls "$ip_url2")")
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fi
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}
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update_sysctl() {
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# Enable net.ipv4.ip_forward for the system
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echo 'net.ipv4.ip_forward=1' > /etc/sysctl.d/99-openvpn-forward.conf
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if [[ -n "$ip6" ]]; then
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# Enable net.ipv6.conf.all.forwarding for the system
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echo "net.ipv6.conf.all.forwarding=1" >> /etc/sysctl.d/99-openvpn-forward.conf
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fi
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# Optimize sysctl settings such as TCP buffer sizes
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cat > /etc/sysctl.d/99-openvpn-optimize.conf <<'EOF'
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kernel.msgmnb = 65536
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kernel.msgmax = 65536
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net.core.wmem_max = 16777216
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net.core.rmem_max = 16777216
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net.ipv4.tcp_rmem = 4096 87380 16777216
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net.ipv4.tcp_wmem = 4096 87380 16777216
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EOF
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# Enable TCP BBR congestion control if kernel version >= 4.20
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if modprobe -q tcp_bbr \
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&& printf '%s\n%s' "4.20" "$(uname -r)" | sort -C -V; then
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cat >> /etc/sysctl.d/99-openvpn-optimize.conf <<'EOF'
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net.core.default_qdisc = fq
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net.ipv4.tcp_congestion_control = bbr
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EOF
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fi
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# Apply sysctl settings
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sysctl -e -q -p /etc/sysctl.d/99-openvpn-forward.conf
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sysctl -e -q -p /etc/sysctl.d/99-openvpn-optimize.conf
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}
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new_client() {
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get_export_dir
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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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} > "$export_dir$client".ovpn
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if [ "$export_to_home_dir" = 1 ]; then
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chown "$SUDO_USER:$SUDO_USER" "$export_dir$client".ovpn
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fi
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chmod 600 "$export_dir$client".ovpn
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}
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show_header() {
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cat <<'EOF'
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OpenVPN Script
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https://github.com/hwdsl2/openvpn-install
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EOF
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}
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show_header2() {
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cat <<'EOF'
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Copyright (c) 2022 Lin Song
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Copyright (c) 2013-2022 Nyr
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EOF
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}
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show_usage() {
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if [ -n "$1" ]; then
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echo "Error: $1" >&2
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fi
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show_header
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show_header2
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cat 1>&2 <<EOF
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Usage: bash $0 [options]
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Options:
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--auto auto install OpenVPN using default options
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-h, --help show this help message and exit
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To customize install options, run this script without arguments.
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EOF
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exit 1
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}
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ovpnsetup() {
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export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
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if [ "$(id -u)" != 0 ]; then
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exiterr "This installer must be run as root. Try 'sudo bash $0'"
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fi
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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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exiterr 'This installer needs to be run with "bash", not "sh".'
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fi
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# Detect OpenVZ 6
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if [[ $(uname -r | cut -d "." -f 1) -eq 2 ]]; then
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exiterr "The system is running an old kernel, which is incompatible with this installer."
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fi
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# Detect OS
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# $os_version variables aren't always in use, but are kept here for convenience
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if grep -qs "ubuntu" /etc/os-release; then
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os="ubuntu"
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os_version=$(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 grep -qs "Amazon Linux release 2" /etc/system-release; then
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os="centos"
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os_version="7"
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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=$(grep -oE '[0-9]+' /etc/fedora-release | head -1)
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group_name="nobody"
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else
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exiterr "This installer seems to be running on an unsupported distribution.
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Supported distros are Ubuntu, Debian, AlmaLinux, Rocky Linux, CentOS, Fedora and Amazon Linux 2."
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fi
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if [[ "$os" == "ubuntu" && "$os_version" -lt 1804 ]]; then
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exiterr "Ubuntu 18.04 or higher is required to use this installer.
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This version of Ubuntu is too old and unsupported."
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fi
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if [[ "$os" == "debian" && "$os_version" -lt 9 ]]; then
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exiterr "Debian 9 or higher is required to use this installer.
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This version of Debian is too old and unsupported."
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fi
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if [[ "$os" == "centos" && "$os_version" -lt 7 ]]; then
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exiterr "CentOS 7 or higher is required to use this installer.
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This version of CentOS is too old and unsupported."
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fi
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if [[ ! -e /dev/net/tun ]] || ! ( exec 7<>/dev/net/tun ) 2>/dev/null; then
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exiterr "The system does not have the TUN device available.
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TUN needs to be enabled before running this installer."
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fi
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auto=0
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if [[ ! -e /etc/openvpn/server/server.conf ]]; then
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if [ "$os" = "centos" ]; then
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if grep -qs "hwdsl2 VPN script" /etc/sysconfig/nftables.conf \
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|| systemctl is-active --quiet nftables 2>/dev/null; then
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exiterr "This system has nftables enabled, which is not supported by this installer."
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fi
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fi
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while [ "$#" -gt 0 ]; do
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case $1 in
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--auto)
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auto=1
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shift
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;;
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-h|--help)
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show_usage
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;;
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*)
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show_usage "Unknown parameter: $1"
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;;
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esac
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done
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# Detect some Debian minimal setups where neither wget nor curl are installed
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if ! hash wget 2>/dev/null && ! hash curl 2>/dev/null; then
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if [ "$auto" = 0 ]; 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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fi
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export DEBIAN_FRONTEND=noninteractive
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(
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set -x
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apt-get -yqq update || apt-get -yqq update
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apt-get -yqq install wget >/dev/null
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) || exiterr2
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fi
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if ! hash ip 2>/dev/null; then
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if [ "$auto" = 0 ]; then
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echo "iproute is required to use this installer."
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read -n1 -r -p "Press any key to install iproute and continue..."
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fi
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if [ "$os" = "debian" ] || [ "$os" = "ubuntu" ]; then
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export DEBIAN_FRONTEND=noninteractive
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(
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set -x
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apt-get -yqq update || apt-get -yqq update
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apt-get -yqq install iproute2 >/dev/null
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) || exiterr2
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else
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(
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set -x
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yum -y -q install iproute >/dev/null
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) || exiterr3
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fi
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fi
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if [ "$auto" = 0 ]; then
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echo
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echo 'Welcome to this OpenVPN server installer!'
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echo 'GitHub: https://github.com/hwdsl2/openvpn-install'
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echo
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echo 'I need to ask you a few questions before starting setup.'
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echo 'You can use the default options and just press enter if you are OK with them.'
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else
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show_header
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echo
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echo 'Starting OpenVPN setup using default options.'
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fi
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# If system has a single IPv4, 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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# Use the IP address on the default route
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ip=$(ip -4 route get 1 | sed 's/ uid .*//' | awk '{print $NF;exit}' 2>/dev/null)
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if ! check_ip "$ip"; then
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find_public_ip
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ip_match=0
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if [ -n "$get_public_ip" ]; then
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ip_list=$(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}')
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while IFS= read -r line; do
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if [ "$line" = "$get_public_ip" ]; then
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ip_match=1
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ip="$line"
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fi
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done <<< "$ip_list"
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fi
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if [ "$ip_match" = 0 ]; then
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if [ "$auto" = 0 ]; then
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echo
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echo "Which IPv4 address should be used?"
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number_of_ip=$(ip -4 addr | grep inet | grep -vEc '127(\.[0-9]{1,3}){3}')
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ip -4 addr | grep inet | grep -vE '127(\.[0-9]{1,3}){3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | nl -s ') '
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read -rp "IPv4 address [1]: " ip_number
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until [[ -z "$ip_number" || "$ip_number" =~ ^[0-9]+$ && "$ip_number" -le "$number_of_ip" ]]; do
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echo "$ip_number: invalid selection."
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read -rp "IPv4 address [1]: " ip_number
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done
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[[ -z "$ip_number" ]] && ip_number=1
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else
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ip_number=1
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fi
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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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fi
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fi
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if ! check_ip "$ip"; then
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echo "Error: Could not detect this server's IP address." >&2
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echo "Abort. No changes were made." >&2
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exit 1
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fi
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# If $ip is a private IP address, the server must be behind NAT
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if printf '%s' "$ip" | grep -qE '^(10|127|172\.(1[6-9]|2[0-9]|3[0-1])|192\.168|169\.254)\.'; then
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find_public_ip
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if ! check_ip "$get_public_ip"; then
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if [ "$auto" = 0 ]; then
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echo
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echo "This server is behind NAT. What is the public IPv4 address?"
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read -rp "Public IPv4 address: " public_ip
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until check_ip "$public_ip"; do
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echo "Invalid input."
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read -rp "Public IPv4 address: " public_ip
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done
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else
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echo "Error: Could not detect this server's public IP." >&2
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echo "Abort. No changes were made." >&2
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exit 1
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fi
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else
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public_ip="$get_public_ip"
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fi
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fi
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if [ "$auto" != 0 ]; then
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echo
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printf '%s' "Server IP: "
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[ -n "$public_ip" ] && printf '%s\n' "$public_ip" || printf '%s\n' "$ip"
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echo "Port: UDP/1194"
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echo "Client name: client"
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echo "Client DNS: Google Public DNS"
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fi
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# If system has a single IPv6, it is selected automatically
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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 system has multiple IPv6, ask the user to select one
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if [[ $(ip -6 addr | grep -c 'inet6 [23]') -gt 1 ]]; then
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if [ "$auto" = 0 ]; then
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echo
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echo "Which IPv6 address should be used?"
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number_of_ip6=$(ip -6 addr | grep -c 'inet6 [23]')
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ip -6 addr | grep 'inet6 [23]' | cut -d '/' -f 1 | grep -oE '([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}' | nl -s ') '
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read -rp "IPv6 address [1]: " ip6_number
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until [[ -z "$ip6_number" || "$ip6_number" =~ ^[0-9]+$ && "$ip6_number" -le "$number_of_ip6" ]]; do
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echo "$ip6_number: invalid selection."
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read -rp "IPv6 address [1]: " ip6_number
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done
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[[ -z "$ip6_number" ]] && ip6_number=1
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else
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ip6_number=1
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fi
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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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if [ "$auto" = 0 ]; then
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echo
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echo "Which protocol should OpenVPN use?"
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echo " 1) UDP (recommended)"
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echo " 2) TCP"
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read -rp "Protocol [1]: " protocol
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until [[ -z "$protocol" || "$protocol" =~ ^[12]$ ]]; do
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echo "$protocol: invalid selection."
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read -rp "Protocol [1]: " protocol
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done
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else
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protocol=1
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fi
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case "$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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if [ "$auto" = 0 ]; then
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echo
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echo "What port should OpenVPN listen to?"
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read -rp "Port [1194]: " port
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until [[ -z "$port" || "$port" =~ ^[0-9]+$ && "$port" -le 65535 ]]; do
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echo "$port: invalid port."
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read -rp "Port [1194]: " port
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done
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[[ -z "$port" ]] && port=1194
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else
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port=1194
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fi
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if [ "$auto" = 0 ]; then
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echo
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echo "Select a DNS server for the clients:"
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echo " 1) Current system resolvers"
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echo " 2) Google Public DNS"
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echo " 3) Cloudflare DNS"
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echo " 4) OpenDNS"
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echo " 5) Quad9"
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echo " 6) AdGuard DNS"
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echo " 7) Custom"
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read -rp "DNS server [2]: " dns
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until [[ -z "$dns" || "$dns" =~ ^[1-7]$ ]]; do
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echo "$dns: invalid selection."
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read -rp "DNS server [2]: " dns
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done
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else
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dns=2
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fi
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if [ "$dns" = 7 ]; then
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read -rp "Enter primary DNS server: " dns1
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until check_ip "$dns1"; do
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echo "Invalid DNS server."
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read -rp "Enter primary DNS server: " dns1
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done
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read -rp "Enter secondary DNS server (Enter to skip): " dns2
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until [ -z "$dns2" ] || check_ip "$dns2"; do
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echo "Invalid DNS server."
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read -rp "Enter secondary DNS server (Enter to skip): " dns2
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done
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fi
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if [ "$auto" = 0 ]; then
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echo
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echo "Enter a name for the first client:"
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read -rp "Name [client]: " unsanitized_client
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# Allow a limited set of characters to avoid conflicts
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client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
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[[ -z "$client" ]] && client=client
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else
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client=client
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fi
|
||
if [ "$auto" = 0 ]; then
|
||
echo
|
||
echo "OpenVPN installation is ready to begin."
|
||
fi
|
||
# 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
|
||
echo "Note: 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
|
||
if [ "$auto" = 0 ]; then
|
||
read -n1 -r -p "Press any key to continue..."
|
||
fi
|
||
echo
|
||
echo "Installing OpenVPN, please wait..."
|
||
# If running inside a container, disable LimitNPROC to prevent conflicts
|
||
if systemd-detect-virt -cq; then
|
||
mkdir /etc/systemd/system/openvpn-server@server.service.d/ 2>/dev/null
|
||
echo "[Service]
|
||
LimitNPROC=infinity" > /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
|
||
fi
|
||
if [[ "$os" = "debian" || "$os" = "ubuntu" ]]; then
|
||
export DEBIAN_FRONTEND=noninteractive
|
||
(
|
||
set -x
|
||
apt-get -yqq update || apt-get -yqq update
|
||
apt-get -yqq --no-install-recommends install openvpn >/dev/null
|
||
) || exiterr2
|
||
(
|
||
set -x
|
||
apt-get -yqq install openssl ca-certificates $firewall >/dev/null
|
||
) || exiterr2
|
||
elif [[ "$os" = "centos" ]]; then
|
||
if grep -qs "Amazon Linux release 2" /etc/system-release; then
|
||
(
|
||
set -x
|
||
amazon-linux-extras install epel -y >/dev/null
|
||
) || exit 1
|
||
else
|
||
(
|
||
set -x
|
||
yum -y -q install epel-release >/dev/null
|
||
) || exiterr3
|
||
fi
|
||
(
|
||
set -x
|
||
yum -y -q install openvpn openssl ca-certificates tar $firewall >/dev/null 2>&1
|
||
) || exiterr3
|
||
else
|
||
# Else, OS must be Fedora
|
||
(
|
||
set -x
|
||
dnf install -y openvpn openssl ca-certificates tar $firewall >/dev/null
|
||
) || exiterr "'dnf install' failed."
|
||
fi
|
||
# If firewalld was just installed, enable it
|
||
if [[ "$firewall" == "firewalld" ]]; then
|
||
(
|
||
set -x
|
||
systemctl enable --now firewalld.service >/dev/null 2>&1
|
||
)
|
||
fi
|
||
# Get easy-rsa
|
||
easy_rsa_url='https://github.com/OpenVPN/easy-rsa/releases/download/v3.1.1/EasyRSA-3.1.1.tgz'
|
||
mkdir -p /etc/openvpn/server/easy-rsa/
|
||
{ wget -t 3 -T 30 -qO- "$easy_rsa_url" 2>/dev/null || curl -m 30 -sL "$easy_rsa_url" ; } | tar xz -C /etc/openvpn/server/easy-rsa/ --strip-components 1
|
||
if [ ! -f /etc/openvpn/server/easy-rsa/easyrsa ]; then
|
||
exiterr "Failed to download EasyRSA from $easy_rsa_url."
|
||
fi
|
||
chown -R root:root /etc/openvpn/server/easy-rsa/
|
||
cd /etc/openvpn/server/easy-rsa/ || exit 1
|
||
(
|
||
set -x
|
||
# Create the PKI, set up the CA and the server and client certificates
|
||
./easyrsa --batch init-pki >/dev/null
|
||
./easyrsa --batch build-ca nopass >/dev/null 2>&1
|
||
./easyrsa --batch --days=3650 build-server-full server nopass >/dev/null 2>&1
|
||
./easyrsa --batch --days=3650 build-client-full "$client" nopass >/dev/null 2>&1
|
||
./easyrsa --batch --days=3650 gen-crl >/dev/null 2>&1
|
||
)
|
||
# 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/
|
||
(
|
||
set -x
|
||
# Generate key for tls-crypt
|
||
openvpn --genkey --secret /etc/openvpn/server/tc.key >/dev/null
|
||
)
|
||
# Create the DH parameters file using the predefined ffdhe2048 group
|
||
echo '-----BEGIN DH PARAMETERS-----
|
||
MIIBCAKCAQEA//////////+t+FRYortKmq/cViAnPTzx2LnFg84tNpWp4TZBFGQz
|
||
+8yTnc4kmz75fS/jY2MMddj2gbICrsRhetPfHtXV/WVhJDP1H18GbtCFY2VVPe0a
|
||
87VXE15/V8k1mE8McODmi3fipona8+/och3xWKE2rec1MKzKT0g6eXq8CrGCsyT7
|
||
YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi
|
||
7MA0BM0oNC9hkXL+nOmFg/+OTxIy7vKBg8P+OxtMb61zO7X8vC7CIAXFjvGDfRaD
|
||
ssbzSibBsu/6iGtCOGEoXJf//////////wIBAg==
|
||
-----END DH PARAMETERS-----' > /etc/openvpn/server/dh.pem
|
||
# Generate server.conf
|
||
echo "local $ip
|
||
port $port
|
||
proto $protocol
|
||
dev tun
|
||
ca ca.crt
|
||
cert server.crt
|
||
key server.key
|
||
dh dh.pem
|
||
auth SHA512
|
||
tls-crypt tc.key
|
||
topology subnet
|
||
server 10.8.0.0 255.255.255.0" > /etc/openvpn/server/server.conf
|
||
# IPv6
|
||
if [[ -z "$ip6" ]]; then
|
||
echo 'push "redirect-gateway def1 bypass-dhcp"' >> /etc/openvpn/server/server.conf
|
||
else
|
||
echo 'server-ipv6 fddd:1194:1194:1194::/64' >> /etc/openvpn/server/server.conf
|
||
echo 'push "redirect-gateway def1 ipv6 bypass-dhcp"' >> /etc/openvpn/server/server.conf
|
||
fi
|
||
echo 'ifconfig-pool-persist ipp.txt' >> /etc/openvpn/server/server.conf
|
||
# DNS
|
||
case "$dns" in
|
||
1)
|
||
# Locate the proper resolv.conf
|
||
# Needed for systems running systemd-resolved
|
||
if grep '^nameserver' "/etc/resolv.conf" | grep -qv '127.0.0.53' ; then
|
||
resolv_conf="/etc/resolv.conf"
|
||
else
|
||
resolv_conf="/run/systemd/resolve/resolv.conf"
|
||
fi
|
||
# Obtain the resolvers from resolv.conf and use them for OpenVPN
|
||
grep -v '^#\|^;' "$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)
|
||
echo "push \"dhcp-option DNS $dns1\"" >> /etc/openvpn/server/server.conf
|
||
if [ -n "$dns2" ]; then
|
||
echo "push \"dhcp-option DNS $dns2\"" >> /etc/openvpn/server/server.conf
|
||
fi
|
||
;;
|
||
esac
|
||
echo 'push "block-outside-dns"' >> /etc/openvpn/server/server.conf
|
||
echo "keepalive 10 120
|
||
cipher AES-256-CBC
|
||
user nobody
|
||
group $group_name
|
||
persist-key
|
||
persist-tun
|
||
verb 3
|
||
crl-verify crl.pem" >> /etc/openvpn/server/server.conf
|
||
if [[ "$protocol" = "udp" ]]; then
|
||
echo "explicit-exit-notify" >> /etc/openvpn/server/server.conf
|
||
fi
|
||
update_sysctl
|
||
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 -q --add-port="$port"/"$protocol"
|
||
firewall-cmd -q --zone=trusted --add-source=10.8.0.0/24
|
||
firewall-cmd -q --permanent --add-port="$port"/"$protocol"
|
||
firewall-cmd -q --permanent --zone=trusted --add-source=10.8.0.0/24
|
||
# Set NAT for the VPN subnet
|
||
firewall-cmd -q --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to "$ip"
|
||
firewall-cmd -q --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to "$ip"
|
||
if [[ -n "$ip6" ]]; then
|
||
firewall-cmd -q --zone=trusted --add-source=fddd:1194:1194:1194::/64
|
||
firewall-cmd -q --permanent --zone=trusted --add-source=fddd:1194:1194:1194::/64
|
||
firewall-cmd -q --direct --add-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to "$ip6"
|
||
firewall-cmd -q --permanent --direct --add-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to "$ip6"
|
||
fi
|
||
else
|
||
# Create a service to set up persistent iptables rules
|
||
iptables_path=$(command -v iptables)
|
||
ip6tables_path=$(command -v ip6tables)
|
||
# nf_tables is not available as standard in OVZ kernels. So use iptables-legacy
|
||
# if we are in OVZ, with a nf_tables backend and iptables-legacy is available.
|
||
if [[ $(systemd-detect-virt) == "openvz" ]] && readlink -f "$(command -v iptables)" | grep -q "nft" && hash iptables-legacy 2>/dev/null; then
|
||
iptables_path=$(command -v iptables-legacy)
|
||
ip6tables_path=$(command -v ip6tables-legacy)
|
||
fi
|
||
echo "[Unit]
|
||
Before=network.target
|
||
[Service]
|
||
Type=oneshot
|
||
ExecStart=$iptables_path -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $ip
|
||
ExecStart=$iptables_path -I INPUT -p $protocol --dport $port -j ACCEPT
|
||
ExecStart=$iptables_path -I FORWARD -s 10.8.0.0/24 -j ACCEPT
|
||
ExecStart=$iptables_path -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
|
||
ExecStop=$iptables_path -t nat -D POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $ip
|
||
ExecStop=$iptables_path -D INPUT -p $protocol --dport $port -j ACCEPT
|
||
ExecStop=$iptables_path -D FORWARD -s 10.8.0.0/24 -j ACCEPT
|
||
ExecStop=$iptables_path -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" > /etc/systemd/system/openvpn-iptables.service
|
||
if [[ -n "$ip6" ]]; then
|
||
echo "ExecStart=$ip6tables_path -t nat -A POSTROUTING -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to $ip6
|
||
ExecStart=$ip6tables_path -I FORWARD -s fddd:1194:1194:1194::/64 -j ACCEPT
|
||
ExecStart=$ip6tables_path -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
|
||
ExecStop=$ip6tables_path -t nat -D POSTROUTING -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to $ip6
|
||
ExecStop=$ip6tables_path -D FORWARD -s fddd:1194:1194:1194::/64 -j ACCEPT
|
||
ExecStop=$ip6tables_path -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" >> /etc/systemd/system/openvpn-iptables.service
|
||
fi
|
||
echo "RemainAfterExit=yes
|
||
[Install]
|
||
WantedBy=multi-user.target" >> /etc/systemd/system/openvpn-iptables.service
|
||
(
|
||
set -x
|
||
systemctl enable --now openvpn-iptables.service >/dev/null 2>&1
|
||
)
|
||
fi
|
||
# If SELinux is enabled and a custom port was selected, we need this
|
||
if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$port" != 1194 ]]; then
|
||
# Install semanage if not already present
|
||
if ! hash semanage 2>/dev/null; then
|
||
if [[ "$os_version" -eq 7 ]]; then
|
||
# Centos 7
|
||
(
|
||
set -x
|
||
yum -y -q install policycoreutils-python >/dev/null
|
||
) || exiterr3
|
||
else
|
||
# CentOS 8 or Fedora
|
||
(
|
||
set -x
|
||
dnf install -y policycoreutils-python-utils >/dev/null
|
||
) || exiterr "'dnf install' failed."
|
||
fi
|
||
fi
|
||
semanage port -a -t openvpn_port_t -p "$protocol" "$port"
|
||
fi
|
||
# If the server is behind NAT, use the correct IP address
|
||
[[ -n "$public_ip" ]] && ip="$public_ip"
|
||
# client-common.txt is created so we have a template to add further users later
|
||
echo "client
|
||
dev tun
|
||
proto $protocol
|
||
remote $ip $port
|
||
resolv-retry infinite
|
||
nobind
|
||
persist-key
|
||
persist-tun
|
||
remote-cert-tls server
|
||
auth SHA512
|
||
cipher AES-256-CBC
|
||
ignore-unknown-option block-outside-dns
|
||
verb 3" > /etc/openvpn/server/client-common.txt
|
||
# Enable and start the OpenVPN service
|
||
(
|
||
set -x
|
||
systemctl enable --now openvpn-server@server.service >/dev/null 2>&1
|
||
)
|
||
# Generates the custom client.ovpn
|
||
new_client
|
||
echo
|
||
echo "Finished!"
|
||
echo
|
||
echo "The client configuration is available in: $export_dir$client.ovpn"
|
||
echo "New clients can be added by running this script again."
|
||
else
|
||
show_header
|
||
echo
|
||
echo "OpenVPN is already installed."
|
||
echo
|
||
echo "Select an option:"
|
||
echo " 1) Add a new client"
|
||
echo " 2) Export config for an existing client"
|
||
echo " 3) List existing clients"
|
||
echo " 4) Revoke an existing client"
|
||
echo " 5) Remove OpenVPN"
|
||
echo " 6) Exit"
|
||
read -rp "Option: " option
|
||
until [[ "$option" =~ ^[1-6]$ ]]; do
|
||
echo "$option: invalid selection."
|
||
read -rp "Option: " option
|
||
done
|
||
case "$option" in
|
||
1)
|
||
echo
|
||
echo "Provide a name for the client:"
|
||
read -rp "Name: " unsanitized_client
|
||
[ -z "$unsanitized_client" ] && abort_and_exit
|
||
client=$(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 -rp "Name: " unsanitized_client
|
||
[ -z "$unsanitized_client" ] && abort_and_exit
|
||
client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
|
||
done
|
||
cd /etc/openvpn/server/easy-rsa/ || exit 1
|
||
(
|
||
set -x
|
||
./easyrsa --batch --days=3650 build-client-full "$client" nopass >/dev/null 2>&1
|
||
)
|
||
# Generates the custom client.ovpn
|
||
new_client
|
||
echo
|
||
echo "$client added. Configuration available in: $export_dir$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 export:"
|
||
tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
|
||
read -rp "Client: " client_number
|
||
[ -z "$client_number" ] && abort_and_exit
|
||
until [[ "$client_number" =~ ^[0-9]+$ && "$client_number" -le "$number_of_clients" ]]; do
|
||
echo "$client_number: invalid selection."
|
||
read -rp "Client: " client_number
|
||
[ -z "$client_number" ] && abort_and_exit
|
||
done
|
||
client=$(tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$client_number"p)
|
||
new_client
|
||
echo
|
||
echo "$client exported. Configuration available in: $export_dir$client.ovpn"
|
||
exit
|
||
;;
|
||
3)
|
||
echo
|
||
echo "Checking for existing client(s)..."
|
||
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
|
||
tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
|
||
if [ "$number_of_clients" = 1 ]; then
|
||
printf '\n%s\n' "Total: 1 client"
|
||
elif [ -n "$number_of_clients" ]; then
|
||
printf '\n%s\n' "Total: $number_of_clients clients"
|
||
fi
|
||
;;
|
||
4)
|
||
number_of_clients=$(tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep -c "^V")
|
||
if [[ "$number_of_clients" = 0 ]]; then
|
||
echo
|
||
echo "There are no existing clients!"
|
||
exit
|
||
fi
|
||
echo
|
||
echo "Select the client to revoke:"
|
||
tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
|
||
read -rp "Client: " client_number
|
||
[ -z "$client_number" ] && abort_and_exit
|
||
until [[ "$client_number" =~ ^[0-9]+$ && "$client_number" -le "$number_of_clients" ]]; do
|
||
echo "$client_number: invalid selection."
|
||
read -rp "Client: " client_number
|
||
[ -z "$client_number" ] && abort_and_exit
|
||
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 -rp "Confirm $client revocation? [y/N]: " revoke
|
||
until [[ "$revoke" =~ ^[yYnN]*$ ]]; do
|
||
echo "$revoke: invalid selection."
|
||
read -rp "Confirm $client revocation? [y/N]: " revoke
|
||
done
|
||
if [[ "$revoke" =~ ^[yY]$ ]]; then
|
||
echo
|
||
echo "Revoking $client..."
|
||
cd /etc/openvpn/server/easy-rsa/ || exit 1
|
||
(
|
||
set -x
|
||
./easyrsa --batch revoke "$client" >/dev/null 2>&1
|
||
./easyrsa --batch --days=3650 gen-crl >/dev/null 2>&1
|
||
)
|
||
rm -f /etc/openvpn/server/crl.pem
|
||
cp /etc/openvpn/server/easy-rsa/pki/crl.pem /etc/openvpn/server/crl.pem
|
||
# CRL is read with each client connection, when OpenVPN is dropped to nobody
|
||
chown nobody:"$group_name" /etc/openvpn/server/crl.pem
|
||
get_export_dir
|
||
ovpn_file="$export_dir$client.ovpn"
|
||
if [ -f "$ovpn_file" ]; then
|
||
echo "Removing $ovpn_file..."
|
||
rm -f "$ovpn_file"
|
||
fi
|
||
echo
|
||
echo "$client revoked!"
|
||
else
|
||
echo
|
||
echo "$client revocation aborted!"
|
||
fi
|
||
exit
|
||
;;
|
||
5)
|
||
echo
|
||
read -rp "Confirm OpenVPN removal? [y/N]: " remove
|
||
until [[ "$remove" =~ ^[yYnN]*$ ]]; do
|
||
echo "$remove: invalid selection."
|
||
read -rp "Confirm OpenVPN removal? [y/N]: " remove
|
||
done
|
||
if [[ "$remove" =~ ^[yY]$ ]]; then
|
||
echo
|
||
echo "Removing OpenVPN, please wait..."
|
||
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 -q --remove-port="$port"/"$protocol"
|
||
firewall-cmd -q --zone=trusted --remove-source=10.8.0.0/24
|
||
firewall-cmd -q --permanent --remove-port="$port"/"$protocol"
|
||
firewall-cmd -q --permanent --zone=trusted --remove-source=10.8.0.0/24
|
||
firewall-cmd -q --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to "$ip"
|
||
firewall-cmd -q --permanent --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to "$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 -q --zone=trusted --remove-source=fddd:1194:1194:1194::/64
|
||
firewall-cmd -q --permanent --zone=trusted --remove-source=fddd:1194:1194:1194::/64
|
||
firewall-cmd -q --direct --remove-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to "$ip6"
|
||
firewall-cmd -q --permanent --direct --remove-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to "$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" "$port"
|
||
fi
|
||
systemctl disable --now openvpn-server@server.service
|
||
rm -f /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
|
||
rm -f /etc/sysctl.d/99-openvpn-forward.conf /etc/sysctl.d/99-openvpn-optimize.conf
|
||
if [ ! -f /usr/bin/wg-quick ] && [ ! -f /usr/sbin/ipsec ] \
|
||
&& [ ! -f /usr/local/sbin/ipsec ]; then
|
||
echo 0 > /proc/sys/net/ipv4/ip_forward
|
||
echo 0 > /proc/sys/net/ipv6/conf/all/forwarding
|
||
fi
|
||
if [[ "$os" = "debian" || "$os" = "ubuntu" ]]; then
|
||
(
|
||
set -x
|
||
rm -rf /etc/openvpn/server
|
||
apt-get remove --purge -y openvpn >/dev/null
|
||
)
|
||
else
|
||
# Else, OS must be CentOS or Fedora
|
||
(
|
||
set -x
|
||
yum -y -q remove openvpn >/dev/null
|
||
rm -rf /etc/openvpn/server
|
||
)
|
||
fi
|
||
echo
|
||
echo "OpenVPN removed!"
|
||
else
|
||
echo
|
||
echo "OpenVPN removal aborted!"
|
||
fi
|
||
exit
|
||
;;
|
||
6)
|
||
exit
|
||
;;
|
||
esac
|
||
fi
|
||
}
|
||
|
||
## Defer setup until we have the complete script
|
||
ovpnsetup "$@"
|
||
|
||
exit 0
|