mirror of
https://github.com/Nyr/openvpn-install.git
synced 2024-11-23 21:46:08 +03:00
462 lines
17 KiB
Bash
462 lines
17 KiB
Bash
#!/bin/bash
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#
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# https://github.com/Nyr/openvpn-install
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#
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# Copyright (c) 2013 Nyr. Released under the MIT License.
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if grep -qs "14.04" /etc/os-release; then
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echo "Ubuntu 14.04 is too old and not supported"
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exit
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fi
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if grep -qs "jessie" /etc/os-release; then
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echo "Debian 8 is too old and not supported"
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exit
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fi
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if grep -qs "CentOS release 6" /etc/redhat-release; then
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echo "CentOS 6 is too old and not supported"
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exit
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fi
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if grep -qs "Ubuntu 16.04" /etc/os-release; then
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echo 'Ubuntu 16.04 is no longer supported in the current version of openvpn-install
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Use an older version if Ubuntu 16.04 support is needed: https://git.io/vpn1604'
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exit
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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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echo "This script needs to be run with bash, not sh"
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exit
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fi
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if [[ "$EUID" -ne 0 ]]; then
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echo "Sorry, you need to run this as root"
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exit
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fi
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if [[ ! -e /dev/net/tun ]]; then
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echo "The TUN device is not available
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You need to enable TUN before running this script"
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exit
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fi
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if ! iptables -t nat -nL &>/dev/null; then
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echo "Unable to initialize the iptables/netfilter NAT table, setup can't continue.
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Make sure that your system has iptables/netfilter available.
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If using OpenVZ, ask your provider to enable full netfilter support."
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exit
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fi
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if [[ -e /etc/debian_version ]]; then
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os="debian"
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group_name="nogroup"
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elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
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os="centos"
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group_name="nobody"
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else
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echo "Looks like you aren't running this installer on Debian, Ubuntu or CentOS"
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exit
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fi
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new_client () {
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# Generates the custom client.ovpn
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{
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cat /etc/openvpn/server/client-common.txt
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echo "<ca>"
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cat /etc/openvpn/server/easy-rsa/pki/ca.crt
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echo "</ca>"
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echo "<cert>"
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sed -ne '/BEGIN CERTIFICATE/,$ p' /etc/openvpn/server/easy-rsa/pki/issued/"$1".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/"$1".key
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echo "</key>"
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echo "<tls-crypt>"
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sed -ne '/BEGIN OpenVPN Static key/,$ p' /etc/openvpn/server/tc.key
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echo "</tls-crypt>"
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} > ~/"$1".ovpn
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}
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if [[ -e /etc/openvpn/server/server.conf ]]; then
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while :
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do
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clear
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echo "Looks like OpenVPN is already installed."
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echo
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echo "What do you want to do?"
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echo " 1) Add a new user"
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echo " 2) Revoke an existing user"
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echo " 3) Remove OpenVPN"
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echo " 4) Exit"
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read -p "Select an option: " option
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until [[ "$option" =~ ^[1-4]$ ]]; do
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echo "$option: invalid selection."
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read -p "Select an option: " option
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done
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case "$option" in
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1)
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echo
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echo "Tell me a name for the client certificate."
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read -p "Client name: " unsanitized_client
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client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
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while [[ -z "$client" || -e /etc/openvpn/server/easy-rsa/pki/issued/"$client".crt ]]; do
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echo "$client: invalid client name."
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read -p "Client name: " unsanitized_client
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client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
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done
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cd /etc/openvpn/server/easy-rsa/
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EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-client-full "$client" nopass
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# Generates the custom client.ovpn
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new_client "$client"
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echo
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echo "Client $client added, configuration is available at:" ~/"$client.ovpn"
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exit
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;;
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2)
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# This option could be documented a bit better and maybe even be simplified
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# ...but what can I say, I want some sleep too
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number_of_clients=$(tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep -c "^V")
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if [[ "$number_of_clients" = 0 ]]; then
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echo
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echo "You have no existing clients!"
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exit
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fi
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echo
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echo "Select the existing client certificate you want to revoke:"
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tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
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read -p "Select one client: " client_number
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until [[ "$client_number" =~ ^[0-9]+$ && "$client_number" -le "$number_of_clients" ]]; do
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echo "$client_number: invalid selection."
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read -p "Select one client: " client_number
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done
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client=$(tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$client_number"p)
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echo
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read -p "Do you really want to revoke access for client $client? [y/N]: " revoke
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until [[ "$revoke" =~ ^[yYnN]*$ ]]; do
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echo "$revoke: invalid selection."
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read -p "Do you really want to revoke access for client $client? [y/N]: " revoke
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done
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if [[ "$revoke" =~ ^[yY]$ ]]; then
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cd /etc/openvpn/server/easy-rsa/
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./easyrsa --batch revoke "$client"
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EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
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rm -f pki/reqs/"$client".req
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rm -f pki/private/"$client".key
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rm -f pki/issued/"$client".crt
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rm -f /etc/openvpn/server/crl.pem
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cp /etc/openvpn/server/easy-rsa/pki/crl.pem /etc/openvpn/server/crl.pem
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# CRL is read with each client connection, when OpenVPN is dropped to nobody
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chown nobody:"$group_name" /etc/openvpn/server/crl.pem
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echo
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echo "Certificate for client $client revoked!"
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else
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echo
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echo "Certificate revocation for client $client aborted!"
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fi
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exit
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;;
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3)
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echo
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read -p "Do you really want to remove OpenVPN? [y/N]: " remove
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until [[ "$remove" =~ ^[yYnN]*$ ]]; do
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echo "$remove: invalid selection."
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read -p "Do you really want to remove OpenVPN? [y/N]: " remove
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done
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if [[ "$remove" =~ ^[yY]$ ]]; then
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port=$(grep '^port ' /etc/openvpn/server/server.conf | cut -d " " -f 2)
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protocol=$(grep '^proto ' /etc/openvpn/server/server.conf | cut -d " " -f 2)
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if pgrep firewalld; then
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ip=$(firewall-cmd --direct --get-rules ipv4 nat POSTROUTING | grep '\-s 10.8.0.0/24 '"'"'!'"'"' -d 10.8.0.0/24 -j SNAT --to ' | cut -d " " -f 10)
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# Using both permanent and not permanent rules to avoid a firewalld reload.
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firewall-cmd --remove-port="$port"/"$protocol"
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firewall-cmd --zone=trusted --remove-source=10.8.0.0/24
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firewall-cmd --permanent --remove-port="$port"/"$protocol"
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firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
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firewall-cmd --direct --remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to "$ip"
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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 "$ip"
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else
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systemctl disable --now openvpn-iptables.service
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rm -f /etc/systemd/system/openvpn-iptables.service
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fi
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if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$port" != 1194 ]]; then
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semanage port -d -t openvpn_port_t -p "$protocol" "$port"
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fi
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systemctl disable --now openvpn-server@server.service
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rm -rf /etc/openvpn/server
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rm -f /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
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rm -f /etc/sysctl.d/30-openvpn-forward.conf
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if [[ "$os" = "debian" ]]; then
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apt-get remove --purge -y openvpn
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else
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yum remove openvpn -y
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fi
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echo
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echo "OpenVPN removed!"
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else
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echo
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echo "Removal aborted!"
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fi
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exit
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;;
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4) exit;;
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esac
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done
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else
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clear
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echo "Welcome to this OpenVPN "road warrior" installer!"
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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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# If system has a single IPv4, it is selected automatically. Else, ask the user
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if [[ $(ip addr | grep inet | grep -v inet6 | grep -vEc '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}') -eq 1 ]]; then
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ip=$(ip addr | grep inet | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}')
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else
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number_of_ips=$(ip addr | grep inet | grep -v inet6 | grep -vEc '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}')
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echo
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echo "What IPv4 address should the OpenVPN server bind to?"
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ip addr | grep inet | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | nl -s ') '
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read -p "IPv4 address [1]: " ip_number
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until [[ -z "$ip_number" || "$ip_number" =~ ^[0-9]+$ && "$ip_number" -le "$number_of_ips" ]]; do
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echo "$ip_number: invalid selection."
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read -p "IPv4 address [1]: " ip_number
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done
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[[ -z "$ip_number" ]] && ip_number="1"
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ip=$(ip addr | grep inet | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | sed -n "$ip_number"p)
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fi
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# If $IP is a private IP address, the server must be behind NAT
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if echo "$ip" | grep -qE '^(10\.|172\.1[6789]\.|172\.2[0-9]\.|172\.3[01]\.|192\.168)'; then
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echo
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echo "This server is behind NAT. What is the public IPv4 address or hostname?"
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get_public_ip=$(wget -4qO- "http://whatismyip.akamai.com/" || curl -4Ls "http://whatismyip.akamai.com/")
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read -p "Public IPv4 address / hostname [$get_public_ip]: " public_ip
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[ -z "$public_ip" ] && public_ip="$get_public_ip"
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fi
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echo
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echo "Which protocol do you want for OpenVPN connections?"
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echo " 1) UDP (recommended)"
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echo " 2) TCP"
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read -p "Protocol [1]: " protocol
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until [[ -z "$protocol" || "$protocol" =~ ^[12]$ ]]; do
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echo "$protocol: invalid selection."
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read -p "Protocol [1]: " protocol
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done
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case "$protocol" in
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1|"")
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protocol=udp
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;;
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2)
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protocol=tcp
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;;
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esac
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echo
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echo "What port do you want OpenVPN listening to?"
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read -p "Port [1194]: " port
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until [[ -z "$port" || "$port" =~ ^[0-9]+$ && "$port" -le 65535 ]]; do
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echo "$port: invalid selection."
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read -p "Port [1194]: " port
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done
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[[ -z "$port" ]] && port="1194"
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echo
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echo "Which DNS do you want to use with the VPN?"
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echo " 1) Current system resolvers"
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echo " 2) 1.1.1.1"
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echo " 3) Google"
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echo " 4) OpenDNS"
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echo " 5) Verisign"
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read -p "DNS [1]: " dns
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until [[ -z "$dns" || "$dns" =~ ^[1-5]$ ]]; do
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echo "$dns: invalid selection."
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read -p "DNS [1]: " dns
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done
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echo
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echo "Finally, tell me a name for the client certificate."
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read -p "Client name [client]: " unsanitized_client
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# Allow a limited set of characters to avoid conflicts
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client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
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[[ -z "$client" ]] && client="client"
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echo
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echo "Okay, that was all I needed. We are ready to set up your OpenVPN server now."
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read -n1 -r -p "Press any key to continue..."
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# If running inside a container, disable LimitNPROC to prevent conflicts
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if systemd-detect-virt -cq; then
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mkdir /etc/systemd/system/openvpn-server@server.service.d/ 2>/dev/null
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echo "[Service]
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LimitNPROC=infinity" > /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
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fi
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if [[ "$os" = "debian" ]]; then
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apt-get update
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apt-get install openvpn iptables openssl ca-certificates -y
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else
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# Else, the distro is CentOS
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yum install epel-release -y
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yum install openvpn iptables openssl ca-certificates tar -y
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fi
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# Get easy-rsa
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easy_rsa_url='https://github.com/OpenVPN/easy-rsa/releases/download/v3.0.5/EasyRSA-nix-3.0.5.tgz'
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wget -O ~/easyrsa.tgz "$easy_rsa_url" 2>/dev/null || curl -Lo ~/easyrsa.tgz "$easy_rsa_url"
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tar xzf ~/easyrsa.tgz -C ~/
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mv ~/EasyRSA-3.0.5/ /etc/openvpn/server/
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mv /etc/openvpn/server/EasyRSA-3.0.5/ /etc/openvpn/server/easy-rsa/
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chown -R root:root /etc/openvpn/server/easy-rsa/
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rm -f ~/easyrsa.tgz
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cd /etc/openvpn/server/easy-rsa/
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# Create the PKI, set up the CA and the server and client certificates
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./easyrsa init-pki
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./easyrsa --batch build-ca nopass
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EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-server-full server nopass
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EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-client-full "$client" nopass
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EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
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# Move the stuff we need
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cp pki/ca.crt pki/private/ca.key pki/issued/server.crt pki/private/server.key pki/crl.pem /etc/openvpn/server
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# CRL is read with each client connection, when OpenVPN is dropped to nobody
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chown nobody:"$group_name" /etc/openvpn/server/crl.pem
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# Generate key for tls-crypt
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openvpn --genkey --secret /etc/openvpn/server/tc.key
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# Create the DH parameters file using the predefined ffdhe2048 group
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echo '-----BEGIN DH PARAMETERS-----
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MIIBCAKCAQEA//////////+t+FRYortKmq/cViAnPTzx2LnFg84tNpWp4TZBFGQz
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+8yTnc4kmz75fS/jY2MMddj2gbICrsRhetPfHtXV/WVhJDP1H18GbtCFY2VVPe0a
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87VXE15/V8k1mE8McODmi3fipona8+/och3xWKE2rec1MKzKT0g6eXq8CrGCsyT7
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YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi
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7MA0BM0oNC9hkXL+nOmFg/+OTxIy7vKBg8P+OxtMb61zO7X8vC7CIAXFjvGDfRaD
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ssbzSibBsu/6iGtCOGEoXJf//////////wIBAg==
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-----END DH PARAMETERS-----' > /etc/openvpn/server/dh.pem
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# Generate server.conf
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echo "local $ip
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port $port
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proto $protocol
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dev tun
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ca ca.crt
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cert server.crt
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key server.key
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dh dh.pem
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auth SHA512
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tls-crypt tc.key
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topology subnet
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server 10.8.0.0 255.255.255.0
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ifconfig-pool-persist ipp.txt" > /etc/openvpn/server/server.conf
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echo 'push "redirect-gateway def1 bypass-dhcp"' >> /etc/openvpn/server/server.conf
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# DNS
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case "$dns" in
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1|"")
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# Locate the proper resolv.conf
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# Needed for systems running systemd-resolved
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if grep -q "127.0.0.53" "/etc/resolv.conf"; then
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resolv_conf="/run/systemd/resolve/resolv.conf"
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else
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resolv_conf="/etc/resolv.conf"
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fi
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# Obtain the resolvers from resolv.conf and use them for OpenVPN
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grep -v '#' "$resolv_conf" | grep nameserver | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | while read line; do
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echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server/server.conf
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done
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;;
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2)
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echo 'push "dhcp-option DNS 1.1.1.1"' >> /etc/openvpn/server/server.conf
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echo 'push "dhcp-option DNS 1.0.0.1"' >> /etc/openvpn/server/server.conf
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;;
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3)
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echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server/server.conf
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echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server/server.conf
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;;
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4)
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echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server/server.conf
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echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server/server.conf
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;;
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5)
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echo 'push "dhcp-option DNS 64.6.64.6"' >> /etc/openvpn/server/server.conf
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echo 'push "dhcp-option DNS 64.6.65.6"' >> /etc/openvpn/server/server.conf
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;;
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esac
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echo "keepalive 10 120
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cipher AES-256-CBC
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user nobody
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group $group_name
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persist-key
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persist-tun
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status openvpn-status.log
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verb 3
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crl-verify crl.pem" >> /etc/openvpn/server/server.conf
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if [[ "$protocol" = "udp" ]]; then
|
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echo "explicit-exit-notify" >> /etc/openvpn/server/server.conf
|
||
fi
|
||
# Enable net.ipv4.ip_forward for the system
|
||
echo 'net.ipv4.ip_forward=1' > /etc/sysctl.d/30-openvpn-forward.conf
|
||
# Enable without waiting for a reboot or service restart
|
||
echo 1 > /proc/sys/net/ipv4/ip_forward
|
||
if pgrep firewalld; 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"
|
||
else
|
||
# Create a service to set up persistent iptables rules
|
||
echo "[Unit]
|
||
Before=network.target
|
||
[Service]
|
||
Type=oneshot
|
||
ExecStart=/sbin/iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $ip
|
||
ExecStart=/sbin/iptables -I INPUT -p $protocol --dport $port -j ACCEPT
|
||
ExecStart=/sbin/iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
|
||
ExecStart=/sbin/iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
|
||
ExecStop=/sbin/iptables -t nat -D POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $ip
|
||
ExecStop=/sbin/iptables -D INPUT -p $protocol --dport $port -j ACCEPT
|
||
ExecStop=/sbin/iptables -D FORWARD -s 10.8.0.0/24 -j ACCEPT
|
||
ExecStop=/sbin/iptables -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
|
||
RemainAfterExit=yes
|
||
[Install]
|
||
WantedBy=multi-user.target" > /etc/systemd/system/openvpn-iptables.service
|
||
systemctl enable --now openvpn-iptables.service
|
||
fi
|
||
# If SELinux is enabled and a custom port was selected, we need this
|
||
if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$port" != 1194 ]]; then
|
||
# Install semanage if not already present
|
||
if ! hash semanage 2>/dev/null; then
|
||
if grep -qs "CentOS Linux release 7" "/etc/centos-release"; then
|
||
yum install policycoreutils-python -y
|
||
else
|
||
yum install policycoreutils-python-utils -y
|
||
fi
|
||
fi
|
||
semanage port -a -t openvpn_port_t -p "$protocol" "$port"
|
||
fi
|
||
# If the server is behind a NAT, use the correct IP address
|
||
if [[ "$public_ip" != "" ]]; then
|
||
ip="$public_ip"
|
||
fi
|
||
# client-common.txt is created so we have a template to add further users later
|
||
echo "client
|
||
dev tun
|
||
proto $protocol
|
||
remote $ip $port
|
||
resolv-retry infinite
|
||
nobind
|
||
persist-key
|
||
persist-tun
|
||
remote-cert-tls server
|
||
auth SHA512
|
||
cipher AES-256-CBC
|
||
ignore-unknown-option block-outside-dns
|
||
block-outside-dns
|
||
verb 3" > /etc/openvpn/server/client-common.txt
|
||
# Enable and start the OpenVPN service
|
||
systemctl enable --now openvpn-server@server.service
|
||
# Generates the custom client.ovpn
|
||
new_client "$client"
|
||
echo
|
||
echo "Finished!"
|
||
echo
|
||
echo "Your client configuration is available at:" ~/"$client.ovpn"
|
||
echo "If you want to add more clients, just run this script again!"
|
||
fi
|