#!/bin/bash # # https://github.com/Nyr/openvpn-install # # Copyright (c) 2013 Nyr. Released under the MIT License. # Detect Debian users running the script with "sh" instead of bash if readlink /proc/$$/exe | grep -q "dash"; then echo 'This installer needs to be run with "bash", not "sh".' exit fi # Discard stdin. Needed when running from a one-liner which includes a newline read -N 999999 -t 0.001 # Detect OS # $os_version variables aren't always in use, but are kept here for convenience if grep -qs "ubuntu" /etc/os-release; then os="ubuntu" os_version=$(grep 'VERSION_ID' /etc/os-release | cut -d '"' -f 2 | tr -d '.') group_name="nogroup" elif [[ -e /etc/debian_version ]]; then os="debian" os_version=$(grep -oE '[0-9]+' /etc/debian_version | head -1) group_name="nogroup" elif [[ -e /etc/almalinux-release || -e /etc/rocky-release || -e /etc/centos-release ]]; then os="centos" os_version=$(grep -shoE '[0-9]+' /etc/almalinux-release /etc/rocky-release /etc/centos-release | head -1) group_name="nobody" elif [[ -e /etc/fedora-release ]]; then os="fedora" os_version=$(grep -oE '[0-9]+' /etc/fedora-release | head -1) group_name="nobody" else echo "This installer seems to be running on an unsupported distribution. Supported distros are Ubuntu, Debian, AlmaLinux, Rocky Linux, CentOS and Fedora." exit fi if [[ "$os" == "ubuntu" && "$os_version" -lt 2204 ]]; then echo "Ubuntu 22.04 or higher is required to use this installer. This version of Ubuntu is too old and unsupported." exit fi if [[ "$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 [[ "$os_version" -lt 11 ]]; then echo "Debian 11 or higher is required to use this installer. This version of Debian is too old and unsupported." exit fi fi if [[ "$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. This version of $os_name is too old and unsupported." exit fi # Detect environments where $PATH does not include the sbin directories if ! grep -q sbin <<< "$PATH"; then echo '$PATH does not include sbin. Try using "su -" instead of "su".' exit fi if [[ "$EUID" -ne 0 ]]; then echo "This installer needs to be run with superuser privileges." exit fi if [[ ! -e /dev/net/tun ]] || ! ( exec 7<>/dev/net/tun ) 2>/dev/null; then echo "The system does not have the TUN device available. TUN needs to be enabled before running this installer." exit fi # Store the absolute path of the directory where the script is located script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )" 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?" echo "Port 443 is recommended: it blends in with HTTPS/QUIC and avoids the" echo "easily-blocked default 1194." read -p "Port [443]: " port until [[ -z "$port" || "$port" =~ ^[0-9]+$ && "$port" -le 65535 ]]; do echo "$port: invalid port." read -p "Port [443]: " port done [[ -z "$port" ]] && port="443" # Always deploy a TCP 443 fallback instance alongside the primary one # Restrictive networks often block UDP, but rarely block TCP on port 443 # Skipped only when the primary instance is already TCP 443 if [[ "$protocol" = "tcp" && "$port" = 443 ]]; then fallback="" else fallback="y" fi # Also deploy a UDP 443 fallback instance. Many networks that block UDP 1194 # (or all non-443 UDP) still pass UDP 443, and it keeps UDP's speed on links # where the TCP 443 fallback would be slower. This shares only the port number # with QUIC/HTTP-3; the packets are still recognizably OpenVPN to DPI, so it # buys reachability, not disguise. # Skipped only when the primary instance is already UDP 443 if [[ "$protocol" = "udp" && "$port" = 443 ]]; then fallback_udp="" else fallback_udp="y" fi # Any OpenVPN instance that ends up on TCP 443 gets a TLS decoy behind # port-share, whether 443 is the primary port or the TCP fallback if [[ ( "$protocol" = "tcp" && "$port" = 443 ) || -n "$fallback" ]]; then tcp443="y" fi if [[ -n "$fallback" || -n "$fallback_udp" ]]; then echo echo "Extra fallback instances on port 443 will also be set up. Clients will use" echo "$protocol $port first and switch to UDP 443 or TCP 443 automatically on" echo "networks where the primary port is blocked." fi echo echo "Select a DNS server for the clients:" echo " 1) Default system resolvers" echo " 2) Google" echo " 3) 1.1.1.1" echo " 4) OpenDNS" echo " 5) Quad9" echo " 6) Gcore" echo " 7) AdGuard" echo " 8) Specify custom resolvers" read -p "DNS server [1]: " dns until [[ -z "$dns" || "$dns" =~ ^[1-8]$ ]]; 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" = "8" ]]; 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" || "$os" == "ubuntu" ]]; then # iptables is way less invasive than firewalld so no warning is given firewall="iptables" fi fi read -n1 -r -p "Press any key to continue..." # A lightweight web server backs the TCP 443 port-share decoy # Active probes or browsers hitting 443 get a real site instead of silence [[ -n "$tcp443" ]] && webserver="nginx" # If running inside a container, disable LimitNPROC to prevent conflicts if systemd-detect-virt -cq; then # Template-wide drop-in so it also covers the TCP fallback instance mkdir /etc/systemd/system/openvpn-server@.service.d/ 2>/dev/null echo "[Service] LimitNPROC=infinity" > /etc/systemd/system/openvpn-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 $webserver elif [[ "$os" = "centos" ]]; then dnf install -y epel-release dnf install -y openvpn openssl ca-certificates tar $firewall $webserver else # Else, OS must be Fedora dnf install -y openvpn openssl ca-certificates tar $firewall $webserver fi # If firewalld was just installed, enable it if [[ "$firewall" == "firewalld" ]]; then systemctl enable --now firewalld.service fi # Get easy-rsa easy_rsa_url='https://github.com/OpenVPN/easy-rsa/releases/download/v3.2.6/EasyRSA-3.2.6.tgz' # Official SHA256 of EasyRSA-3.2.6.tgz, used to protect against tampered downloads easy_rsa_sha256='c2572990ce91112eef8d1b8e4a3b58790da95b68501785c621f69121dfbd22d7' easy_rsa_tgz=$(mktemp) wget -qO "$easy_rsa_tgz" "$easy_rsa_url" 2>/dev/null || curl -sLo "$easy_rsa_tgz" "$easy_rsa_url" if ! echo "$easy_rsa_sha256 $easy_rsa_tgz" | sha256sum -c --status; then rm -f "$easy_rsa_tgz" echo "easy-rsa download failed the integrity check. Aborting installation." exit 1 fi mkdir -p /etc/openvpn/server/easy-rsa/ tar xzf "$easy_rsa_tgz" -C /etc/openvpn/server/easy-rsa/ --strip-components 1 rm -f "$easy_rsa_tgz" chown -R root:root /etc/openvpn/server/easy-rsa/ cd /etc/openvpn/server/easy-rsa/ # Create the PKI and set up the CA ./easyrsa --batch init-pki ./easyrsa --batch build-ca nopass # 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 # Make easy-rsa aware of our external DH file (prevents a warning) ln -s /etc/openvpn/server/dh.pem pki/dh.pem # Create certificates and CRL # Server certificate is long-lived, client certificates expire after 3 years ./easyrsa --batch --days=3650 build-server-full server nopass ./easyrsa --batch --days=1095 build-client-full "$client" nopass ./easyrsa --batch --days=3650 gen-crl # Move the stuff we need cp pki/ca.crt pki/private/ca.key pki/issued/server.crt pki/private/server.key pki/crl.pem /etc/openvpn/server # Create the tls-crypt-v2 server key and an individual key for the first client # Unlike tls-crypt v1, a leaked client config does not expose a key shared by everyone openvpn --genkey tls-crypt-v2-server /etc/openvpn/server/tc-v2.key openvpn --tls-crypt-v2 /etc/openvpn/server/tc-v2.key --genkey tls-crypt-v2-client pki/private/"$client".tc-v2.key # Ensure key material is only readable by root chmod 600 /etc/openvpn/server/ca.key /etc/openvpn/server/server.key /etc/openvpn/server/tc-v2.key # 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 server.conf echo "local $ip port $port proto $protocol dev tun ca ca.crt cert server.crt key server.key dh dh.pem auth SHA512 tls-crypt-v2 tc-v2.key tls-version-min 1.3 data-ciphers AES-256-GCM:AES-128-GCM:CHACHA20-POLY1305 mssfix 1420 topology subnet server 10.8.0.0 255.255.255.0" > /etc/openvpn/server/server.conf # IPv6 if [[ -z "$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 95.85.95.85"' >> /etc/openvpn/server/server.conf echo 'push "dhcp-option DNS 2.56.220.2"' >> /etc/openvpn/server/server.conf ;; 7) 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 ;; 8) 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 $group_name persist-key persist-tun verb 3 status /run/openvpn-server/status-server.log status-version 2 crl-verify crl.pem" >> /etc/openvpn/server/server.conf if [[ "$protocol" = "udp" ]]; then # UDP tuning: larger socket buffers and reduced syscall overhead echo 'explicit-exit-notify fast-io sndbuf 524288 rcvbuf 524288 push "sndbuf 524288" push "rcvbuf 524288"' >> /etc/openvpn/server/server.conf fi # Create the TCP 443 fallback instance, reusing the same PKI, DNS and routing # options, but with its own subnet and without the UDP-only options if [[ -n "$fallback" ]]; then sed 's|^port .*|port 443|; s|^proto .*|proto tcp|; s|^server 10\.8\.0\.0 .*|server 10.8.1.0 255.255.255.0|; s|fddd:1194:1194:1194::|fddd:1195:1195:1195::|g; s|^ifconfig-pool-persist ipp\.txt|ifconfig-pool-persist ipp-tcp.txt|; s|status-server\.log|status-server-tcp.log|' /etc/openvpn/server/server.conf | grep -vE '^(explicit-exit-notify|fast-io|sndbuf|rcvbuf)|^push "(snd|rcv)buf' > /etc/openvpn/server/server-tcp.conf fi # Create the UDP 443 fallback instance, reusing the same PKI, DNS and routing # options but on its own subnet (reachability on networks that pass UDP 443) if [[ -n "$fallback_udp" ]]; then sed 's|^port .*|port 443|; s|^proto .*|proto udp|; s|^server 10\.8\.0\.0 .*|server 10.8.2.0 255.255.255.0|; s|fddd:1194:1194:1194::|fddd:1196:1196:1196::|g; s|^ifconfig-pool-persist ipp\.txt|ifconfig-pool-persist ipp-udp.txt|; s|status-server\.log|status-server-udp.log|' /etc/openvpn/server/server.conf > /etc/openvpn/server/server-udp.conf # When the primary is TCP, the UDP tuning block is absent, so add it here if ! grep -q '^explicit-exit-notify' /etc/openvpn/server/server-udp.conf; then echo 'explicit-exit-notify fast-io sndbuf 524288 rcvbuf 524288 push "sndbuf 524288" push "rcvbuf 524288"' >> /etc/openvpn/server/server-udp.conf fi fi # Whenever an instance listens on TCP 443, stand up a TLS decoy behind # OpenVPN's port-share. Any connection on 443 that is not a valid OpenVPN # handshake (an active probe or a browser) is forwarded to a real HTTPS # site, so 443 completes a normal TLS handshake instead of returning # silence or the tell-tale "443 that does not speak TLS" anomaly. # This only defeats active probing; it does not obfuscate the VPN stream. # Runs after the UDP fallback is derived so port-share is never inherited by # the UDP instance (port-share is TCP-only and would break it). if [[ -n "$tcp443" ]]; then # The TCP 443 instance is the fallback when one exists, otherwise the # primary server was itself configured on TCP 443 if [[ -n "$fallback" ]]; then tcp443_conf=/etc/openvpn/server/server-tcp.conf else tcp443_conf=/etc/openvpn/server/server.conf fi # Self-signed cert so the decoy can terminate TLS. nginx reads the key # as root at startup, so it can stay chmod 600. Kept under the server # dir so it is removed with everything else on uninstall. mkdir -p /etc/openvpn/server/decoy openssl req -x509 -newkey rsa:2048 -sha256 -days 3650 -nodes -keyout /etc/openvpn/server/decoy/decoy.key -out /etc/openvpn/server/decoy/decoy.crt -subj "/CN=localhost" 2>/dev/null chmod 600 /etc/openvpn/server/decoy/decoy.key 2>/dev/null mkdir -p /var/www/openvpn-decoy echo ' Northwind Studio
Northwind Studio

Something new is on the way.

We are a small product studio building tools for teams. Our new site is almost ready — leave your email and we will let you know the moment we launch.

' > /var/www/openvpn-decoy/index.html mkdir -p /etc/nginx/conf.d # Drop the distro default vhost so our port 80 block is the only # default_server (Debian ships one with default_server, which would # otherwise collide and stop nginx from starting) rm -f /etc/nginx/sites-enabled/default 2>/dev/null if [[ -s /etc/openvpn/server/decoy/decoy.crt && -s /etc/openvpn/server/decoy/decoy.key ]]; then # TLS decoy: an HTTPS probe to 443 completes a normal handshake and # gets a real page, killing the "443 that does not speak TLS" tell. # Port 80 redirects to 443 so the host looks like a normal website # that serves both ports. HTTP/2 + a modern cipher/ALPN profile make # the decoy TLS fingerprint match an ordinary nginx site. echo 'server { listen 80 default_server; return 301 https://$host$request_uri; } server { listen 127.0.0.1:8080 ssl http2; server_name _; ssl_certificate /etc/openvpn/server/decoy/decoy.crt; ssl_certificate_key /etc/openvpn/server/decoy/decoy.key; ssl_protocols TLSv1.2 TLSv1.3; ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305; ssl_prefer_server_ciphers off; ssl_session_cache shared:SSL:1m; ssl_session_timeout 10m; root /var/www/openvpn-decoy; index index.html; # Serve the page even to a plain-HTTP request that lands on the TLS port error_page 497 =200 /index.html; location / { try_files $uri $uri/ =404; } }' > /etc/nginx/conf.d/openvpn-decoy.conf else # Cert generation failed for some reason: keep a plain-HTTP decoy so # the port-share backend is still alive (a refused 443 is worse). # Serve the site directly on 80 (no TLS to redirect to here). echo 'server { listen 80 default_server; root /var/www/openvpn-decoy; index index.html; location / { try_files $uri $uri/ =404; } } server { listen 127.0.0.1:8080; server_name _; root /var/www/openvpn-decoy; index index.html; location / { try_files $uri $uri/ =404; } }' > /etc/nginx/conf.d/openvpn-decoy.conf fi systemctl enable --now nginx 2>/dev/null systemctl reload nginx 2>/dev/null || systemctl restart nginx # Hand non-OpenVPN traffic on 443 to the local TLS decoy echo 'port-share 127.0.0.1 8080' >> "$tcp443_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 "$ip6" ]]; then # Enable net.ipv6.conf.all.forwarding for the system echo "net.ipv6.conf.all.forwarding=1" >> /etc/sysctl.d/99-openvpn-forward.conf # Enable without waiting for a reboot or service restart echo 1 > /proc/sys/net/ipv6/conf/all/forwarding fi # Raise socket buffer limits so the sndbuf/rcvbuf values above take effect echo 'net.core.rmem_max=4194304 net.core.wmem_max=4194304' >> /etc/sysctl.d/99-openvpn-forward.conf echo 4194304 > /proc/sys/net/core/rmem_max echo 4194304 > /proc/sys/net/core/wmem_max # Enable BBR congestion control if the kernel supports it # Helps the TCP fallback and server-side traffic on lossy links if modprobe tcp_bbr 2>/dev/null && grep -qw bbr /proc/sys/net/ipv4/tcp_available_congestion_control; then echo 'net.core.default_qdisc=fq net.ipv4.tcp_congestion_control=bbr' >> /etc/sysctl.d/99-openvpn-forward.conf echo fq > /proc/sys/net/core/default_qdisc echo bbr > /proc/sys/net/ipv4/tcp_congestion_control fi if systemctl is-active --quiet firewalld.service; then # Using both permanent and not permanent rules to avoid a firewalld # reload. # We don't use --add-service=openvpn because that would only work with # the default port and protocol. firewall-cmd --add-port="$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 if [[ -n "$fallback" ]]; then firewall-cmd --add-port=443/tcp firewall-cmd --zone=trusted --add-source=10.8.1.0/24 firewall-cmd --permanent --add-port=443/tcp firewall-cmd --permanent --zone=trusted --add-source=10.8.1.0/24 firewall-cmd --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.1.0/24 ! -d 10.8.1.0/24 -j SNAT --to "$ip" firewall-cmd --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.1.0/24 ! -d 10.8.1.0/24 -j SNAT --to "$ip" if [[ -n "$ip6" ]]; then firewall-cmd --zone=trusted --add-source=fddd:1195:1195:1195::/64 firewall-cmd --permanent --zone=trusted --add-source=fddd:1195:1195:1195::/64 firewall-cmd --direct --add-rule ipv6 nat POSTROUTING 0 -s fddd:1195:1195:1195::/64 ! -d fddd:1195:1195:1195::/64 -j SNAT --to "$ip6" firewall-cmd --permanent --direct --add-rule ipv6 nat POSTROUTING 0 -s fddd:1195:1195:1195::/64 ! -d fddd:1195:1195:1195::/64 -j SNAT --to "$ip6" fi fi if [[ -n "$fallback_udp" ]]; then firewall-cmd --add-port=443/udp firewall-cmd --zone=trusted --add-source=10.8.2.0/24 firewall-cmd --permanent --add-port=443/udp firewall-cmd --permanent --zone=trusted --add-source=10.8.2.0/24 firewall-cmd --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.2.0/24 ! -d 10.8.2.0/24 -j SNAT --to "$ip" firewall-cmd --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -s 10.8.2.0/24 ! -d 10.8.2.0/24 -j SNAT --to "$ip" if [[ -n "$ip6" ]]; then firewall-cmd --zone=trusted --add-source=fddd:1196:1196:1196::/64 firewall-cmd --permanent --zone=trusted --add-source=fddd:1196:1196:1196::/64 firewall-cmd --direct --add-rule ipv6 nat POSTROUTING 0 -s fddd:1196:1196:1196::/64 ! -d fddd:1196:1196:1196::/64 -j SNAT --to "$ip6" firewall-cmd --permanent --direct --add-rule ipv6 nat POSTROUTING 0 -s fddd:1196:1196:1196::/64 ! -d fddd:1196:1196:1196::/64 -j SNAT --to "$ip6" fi fi # Open port 80 for the decoy web server so the host looks like a normal # website serving both 80 (redirect) and 443. Needed with firewalld, # which denies unlisted ports by default. if [[ -n "$tcp443" ]]; then firewall-cmd --add-port=80/tcp firewall-cmd --permanent --add-port=80/tcp fi else # Create a service to set up persistent iptables rules iptables_path=$(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] 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=$ip6tables_path -w 5 -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" >> /etc/systemd/system/openvpn-iptables.service fi if [[ -n "$fallback" ]]; then echo "ExecStart=$iptables_path -w 5 -t nat -A POSTROUTING -s 10.8.1.0/24 ! -d 10.8.1.0/24 -j SNAT --to $ip ExecStart=$iptables_path -w 5 -I INPUT -p tcp --dport 443 -j ACCEPT ExecStart=$iptables_path -w 5 -I FORWARD -s 10.8.1.0/24 -j ACCEPT ExecStop=$iptables_path -w 5 -t nat -D POSTROUTING -s 10.8.1.0/24 ! -d 10.8.1.0/24 -j SNAT --to $ip ExecStop=$iptables_path -w 5 -D INPUT -p tcp --dport 443 -j ACCEPT ExecStop=$iptables_path -w 5 -D FORWARD -s 10.8.1.0/24 -j ACCEPT" >> /etc/systemd/system/openvpn-iptables.service if [[ -n "$ip6" ]]; then echo "ExecStart=$ip6tables_path -w 5 -t nat -A POSTROUTING -s fddd:1195:1195:1195::/64 ! -d fddd:1195:1195:1195::/64 -j SNAT --to $ip6 ExecStart=$ip6tables_path -w 5 -I FORWARD -s fddd:1195:1195:1195::/64 -j ACCEPT ExecStop=$ip6tables_path -w 5 -t nat -D POSTROUTING -s fddd:1195:1195:1195::/64 ! -d fddd:1195:1195:1195::/64 -j SNAT --to $ip6 ExecStop=$ip6tables_path -w 5 -D FORWARD -s fddd:1195:1195:1195::/64 -j ACCEPT" >> /etc/systemd/system/openvpn-iptables.service fi fi if [[ -n "$fallback_udp" ]]; then echo "ExecStart=$iptables_path -w 5 -t nat -A POSTROUTING -s 10.8.2.0/24 ! -d 10.8.2.0/24 -j SNAT --to $ip ExecStart=$iptables_path -w 5 -I INPUT -p udp --dport 443 -j ACCEPT ExecStart=$iptables_path -w 5 -I FORWARD -s 10.8.2.0/24 -j ACCEPT ExecStop=$iptables_path -w 5 -t nat -D POSTROUTING -s 10.8.2.0/24 ! -d 10.8.2.0/24 -j SNAT --to $ip ExecStop=$iptables_path -w 5 -D INPUT -p udp --dport 443 -j ACCEPT ExecStop=$iptables_path -w 5 -D FORWARD -s 10.8.2.0/24 -j ACCEPT" >> /etc/systemd/system/openvpn-iptables.service if [[ -n "$ip6" ]]; then echo "ExecStart=$ip6tables_path -w 5 -t nat -A POSTROUTING -s fddd:1196:1196:1196::/64 ! -d fddd:1196:1196:1196::/64 -j SNAT --to $ip6 ExecStart=$ip6tables_path -w 5 -I FORWARD -s fddd:1196:1196:1196::/64 -j ACCEPT ExecStop=$ip6tables_path -w 5 -t nat -D POSTROUTING -s fddd:1196:1196:1196::/64 ! -d fddd:1196:1196:1196::/64 -j SNAT --to $ip6 ExecStop=$ip6tables_path -w 5 -D FORWARD -s fddd:1196:1196:1196::/64 -j ACCEPT" >> /etc/systemd/system/openvpn-iptables.service fi fi # Accept inbound HTTP on 80 for the decoy web server (redirect to 443) if [[ -n "$tcp443" ]]; then echo "ExecStart=$iptables_path -w 5 -I INPUT -p tcp --dport 80 -j ACCEPT ExecStop=$iptables_path -w 5 -D INPUT -p tcp --dport 80 -j ACCEPT" >> /etc/systemd/system/openvpn-iptables.service fi echo "RemainAfterExit=yes [Install] WantedBy=multi-user.target" >> /etc/systemd/system/openvpn-iptables.service systemctl enable --now openvpn-iptables.service fi # If SELinux is enabled and a custom port was selected, we need this if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$port" != 1194 || -n "$fallback" || -n "$fallback_udp" ]]; then # Install semanage if not already present if ! hash semanage 2>/dev/null; then dnf install -y policycoreutils-python-utils fi if [[ "$port" != 1194 ]]; then # If the port is already defined in the base policy, modify it instead semanage port -a -t openvpn_port_t -p "$protocol" "$port" 2>/dev/null || semanage port -m -t openvpn_port_t -p "$protocol" "$port" fi if [[ -n "$fallback" ]]; then # 443 belongs to http_port_t in the base policy, so modify it semanage port -a -t openvpn_port_t -p tcp 443 2>/dev/null || semanage port -m -t openvpn_port_t -p tcp 443 fi if [[ -n "$tcp443" ]]; then # Allow OpenVPN to open the loopback connection to the port-share decoy # (needed whether 443 is the primary port or the TCP fallback) setsebool -P openvpn_can_network_connect 1 fi if [[ -n "$fallback_udp" ]]; then semanage port -a -t openvpn_port_t -p udp 443 2>/dev/null || semanage port -m -t openvpn_port_t -p udp 443 fi 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 remote $ip $port $protocol" > /etc/openvpn/server/client-common.txt if [[ -n "$fallback_udp" ]]; then # UDP 443 fallback, tried before TCP because UDP is faster echo "remote $ip 443 udp" >> /etc/openvpn/server/client-common.txt fi if [[ -n "$fallback" ]]; then # TCP 443 fallback, last resort for networks that block all UDP echo "remote $ip 443 tcp" >> /etc/openvpn/server/client-common.txt fi if [[ -n "$fallback_udp" || -n "$fallback" ]]; then # Move on to the next remote quickly when one is unreachable echo "connect-timeout 10" >> /etc/openvpn/server/client-common.txt fi echo "resolv-retry infinite nobind persist-key persist-tun remote-cert-tls server verify-x509-name server name auth SHA512 ignore-unknown-option block-outside-dns verb 3" >> /etc/openvpn/server/client-common.txt # Restart instances automatically if the daemon ever crashes mkdir /etc/systemd/system/openvpn-server@.service.d/ 2>/dev/null echo "[Service] Restart=on-failure RestartSec=5" > /etc/systemd/system/openvpn-server@.service.d/restart-on-failure.conf systemctl daemon-reload # Enable and start the OpenVPN service systemctl enable --now openvpn-server@server.service if [[ -n "$fallback" ]]; then systemctl enable --now openvpn-server@server-tcp.service fi if [[ -n "$fallback_udp" ]]; then systemctl enable --now openvpn-server@server-udp.service fi # Nightly maintenance restart during idle hours # Instances with connected clients are skipped, so nobody gets disconnected echo '#!/bin/bash for instance in server server-tcp server-udp; do [[ -e /etc/openvpn/server/$instance.conf ]] || continue # CLIENT_LIST lines are only present while clients are connected grep -q "^CLIENT_LIST" /run/openvpn-server/status-$instance.log 2>/dev/null && continue systemctl try-restart openvpn-server@$instance.service done' > /usr/local/sbin/openvpn-idle-restart chmod 755 /usr/local/sbin/openvpn-idle-restart echo "[Unit] Description=Restart idle OpenVPN server instances [Service] Type=oneshot ExecStart=/usr/local/sbin/openvpn-idle-restart" > /etc/systemd/system/openvpn-idle-restart.service echo "[Unit] Description=Nightly restart of idle OpenVPN server instances [Timer] OnCalendar=*-*-* 04:30:00 RandomizedDelaySec=30min [Install] WantedBy=timers.target" > /etc/systemd/system/openvpn-idle-restart.timer systemctl enable --now openvpn-idle-restart.timer # Build the $client.ovpn file, stripping comments from easy-rsa in the process grep -vh '^#' /etc/openvpn/server/client-common.txt /etc/openvpn/server/easy-rsa/pki/inline/private/"$client".inline > "$script_dir"/"$client".ovpn # Append the client's individual tls-crypt-v2 key echo "" >> "$script_dir"/"$client".ovpn cat /etc/openvpn/server/easy-rsa/pki/private/"$client".tc-v2.key >> "$script_dir"/"$client".ovpn echo "" >> "$script_dir"/"$client".ovpn # The .ovpn file contains the client private key, so restrict access to it chmod 600 "$script_dir"/"$client".ovpn echo echo "Finished!" echo echo "The client configuration is available in:" "$script_dir"/"$client.ovpn" if [[ -n "$fallback_udp" || -n "$fallback" ]]; then echo -n "Clients will connect over $protocol $port and fall back to" [[ -n "$fallback_udp" ]] && echo -n " UDP 443" [[ -n "$fallback_udp" && -n "$fallback" ]] && echo -n " then" [[ -n "$fallback" ]] && echo -n " TCP 443" echo " automatically." fi echo "New clients can be added by running this script again." else clear echo "OpenVPN is already installed." echo echo "Select an option:" echo " 1) Add a new client" echo " 2) Revoke an existing client" echo " 3) Remove OpenVPN" echo " 4) Exit" read -p "Option: " option until [[ "$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' <<< "$unsanitized_client") done cd /etc/openvpn/server/easy-rsa/ ./easyrsa --batch --days=1095 build-client-full "$client" nopass # Create an individual tls-crypt-v2 key for the new client openvpn --tls-crypt-v2 /etc/openvpn/server/tc-v2.key --genkey tls-crypt-v2-client pki/private/"$client".tc-v2.key # Build the $client.ovpn file, stripping comments from easy-rsa in the process grep -vh '^#' /etc/openvpn/server/client-common.txt /etc/openvpn/server/easy-rsa/pki/inline/private/"$client".inline > "$script_dir"/"$client".ovpn # Append the client's individual tls-crypt-v2 key echo "" >> "$script_dir"/"$client".ovpn cat /etc/openvpn/server/easy-rsa/pki/private/"$client".tc-v2.key >> "$script_dir"/"$client".ovpn echo "" >> "$script_dir"/"$client".ovpn # The .ovpn file contains the client private key, so restrict access to it chmod 600 "$script_dir"/"$client".ovpn echo echo "$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/"$client".key rm -f /etc/openvpn/server/easy-rsa/pki/private/"$client".tc-v2.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 if [[ -e /etc/openvpn/server/server-tcp.conf ]]; then firewall-cmd --remove-port=443/tcp firewall-cmd --zone=trusted --remove-source=10.8.1.0/24 firewall-cmd --permanent --remove-port=443/tcp firewall-cmd --permanent --zone=trusted --remove-source=10.8.1.0/24 firewall-cmd --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.1.0/24 ! -d 10.8.1.0/24 -j SNAT --to "$ip" firewall-cmd --permanent --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.1.0/24 ! -d 10.8.1.0/24 -j SNAT --to "$ip" if grep -qs "server-ipv6" /etc/openvpn/server/server-tcp.conf; then firewall-cmd --zone=trusted --remove-source=fddd:1195:1195:1195::/64 firewall-cmd --permanent --zone=trusted --remove-source=fddd:1195:1195:1195::/64 firewall-cmd --direct --remove-rule ipv6 nat POSTROUTING 0 -s fddd:1195:1195:1195::/64 ! -d fddd:1195:1195:1195::/64 -j SNAT --to "$ip6" firewall-cmd --permanent --direct --remove-rule ipv6 nat POSTROUTING 0 -s fddd:1195:1195:1195::/64 ! -d fddd:1195:1195:1195::/64 -j SNAT --to "$ip6" fi fi if [[ -e /etc/openvpn/server/server-udp.conf ]]; then firewall-cmd --remove-port=443/udp firewall-cmd --zone=trusted --remove-source=10.8.2.0/24 firewall-cmd --permanent --remove-port=443/udp firewall-cmd --permanent --zone=trusted --remove-source=10.8.2.0/24 firewall-cmd --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.2.0/24 ! -d 10.8.2.0/24 -j SNAT --to "$ip" firewall-cmd --permanent --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.2.0/24 ! -d 10.8.2.0/24 -j SNAT --to "$ip" if grep -qs "server-ipv6" /etc/openvpn/server/server-udp.conf; then firewall-cmd --zone=trusted --remove-source=fddd:1196:1196:1196::/64 firewall-cmd --permanent --zone=trusted --remove-source=fddd:1196:1196:1196::/64 firewall-cmd --direct --remove-rule ipv6 nat POSTROUTING 0 -s fddd:1196:1196:1196::/64 ! -d fddd:1196:1196:1196::/64 -j SNAT --to "$ip6" firewall-cmd --permanent --direct --remove-rule ipv6 nat POSTROUTING 0 -s fddd:1196:1196:1196::/64 ! -d fddd:1196:1196:1196::/64 -j SNAT --to "$ip6" fi fi # Close the decoy HTTP port (only present if a TCP 443 decoy # was set up, which is whenever nginx was installed) if [[ -e /etc/nginx/conf.d/openvpn-decoy.conf ]]; then firewall-cmd --remove-port=80/tcp firewall-cmd --permanent --remove-port=80/tcp 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"; then if [[ "$port" != 1194 ]]; then semanage port -d -t openvpn_port_t -p "$protocol" "$port" fi if [[ -e /etc/openvpn/server/server-tcp.conf ]]; then semanage port -d -t openvpn_port_t -p tcp 443 fi if [[ -e /etc/openvpn/server/server-udp.conf ]]; then semanage port -d -t openvpn_port_t -p udp 443 fi fi systemctl disable --now openvpn-server@server.service if [[ -e /etc/openvpn/server/server-tcp.conf ]]; then systemctl disable --now openvpn-server@server-tcp.service fi if [[ -e /etc/openvpn/server/server-udp.conf ]]; then systemctl disable --now openvpn-server@server-udp.service fi systemctl disable --now openvpn-idle-restart.timer rm -f /etc/systemd/system/openvpn-idle-restart.timer /etc/systemd/system/openvpn-idle-restart.service /usr/local/sbin/openvpn-idle-restart rm -f /etc/systemd/system/openvpn-server@.service.d/disable-limitnproc.conf rm -f /etc/systemd/system/openvpn-server@.service.d/restart-on-failure.conf rm -f /etc/sysctl.d/99-openvpn-forward.conf # Remove the port-share decoy site (nginx itself is left installed) if [[ -e /etc/nginx/conf.d/openvpn-decoy.conf ]]; then rm -f /etc/nginx/conf.d/openvpn-decoy.conf rm -rf /var/www/openvpn-decoy systemctl reload nginx 2>/dev/null fi if [[ "$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 fi