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小绿叶技术Lv154   
ubuntu 安装 openVPN 脚本研究     


#!/bin/bash
#
# https://github.com/Nyr/openvpn-install
#
# Copyright (c) 2013 Nyr. Released under the MIT License.

vpnGW="10.1.1.0"

# 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 an one-liner which includes a newline
read -N 999999 -t 0.001

# Detect OpenVZ 6
if [[ $(uname -r | cut -d "." -f 1) -eq 2 ]]; then
        echo "The system is running an old kernel, which is incompatible with this installer."
        exit
fi

# 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 1804 ]]; then
        echo "Ubuntu 18.04 or higher is required to use this installer.
This version of Ubuntu is too old and unsupported."
        exit
fi

if [[ "$os" == "debian" && "$os_version" -lt 9 ]]; then
        echo "Debian 9 or higher is required to use this installer.
This version of Debian is too old and unsupported."
        exit
fi

if [[ "$os" == "centos" && "$os_version" -lt 7 ]]; then
        echo "CentOS 7 or higher is required to use this installer.
This version of CentOS 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

new_client () {
        # Generates the custom client.ovpn
        {
        cat /etc/openvpn/server/client-common.txt
        echo "<ca>"
        cat /etc/openvpn/server/easy-rsa/pki/ca.crt
        echo "</ca>"
        echo "<cert>"
        sed -ne '/BEGIN CERTIFICATE/,$ p' /etc/openvpn/server/easy-rsa/pki/issued/"$client".crt
        echo "</cert>"
        echo "<key>"
        cat /etc/openvpn/server/easy-rsa/pki/private/"$client".key
        echo "</key>"
        echo "<tls-crypt>"
        sed -ne '/BEGIN OpenVPN Static key/,$ p' /etc/openvpn/server/tc.key
        echo "</tls-crypt>"
        } > ~/"$client".ovpn
}

if [[ ! -e /etc/openvpn/server/server.conf ]]; then
        # Detect some Debian minimal setups where neither wget nor curl are installed
        if ! hash wget 2>/dev/null && ! hash curl 2>/dev/null; then
                echo "Wget is required to use this installer."
                read -n1 -r -p "Press any key to install Wget and continue..."
                apt-get update
                apt-get install -y wget
        fi
        clear
        echo 'Welcome to this OpenVPN road warrior installer!'
        # If system has a single IPv4, it is selected automatically. Else, ask the user
        if [[ $(ip -4 addr | grep inet | grep -vEc '127(\.[0-9]{1,3}){3}') -eq 1 ]]; then
                ip=$(ip -4 addr | grep inet | grep -vE '127(\.[0-9]{1,3}){3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}')
        else
                number_of_ip=$(ip -4 addr | grep inet | grep -vEc '127(\.[0-9]{1,3}){3}')
                echo
                echo "Which IPv4 address should be used?"
                ip -4 addr | grep inet | grep -vE '127(\.[0-9]{1,3}){3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | nl -s ') '
                read -p "IPv4 address [1]: " ip_number
                until [[ -z "$ip_number" || "$ip_number" =~ ^[0-9]+$ && "$ip_number" -le "$number_of_ip" ]]; do
                        echo "$ip_number: invalid selection."
                        read -p "IPv4 address [1]: " ip_number
                done
                [[ -z "$ip_number" ]] && ip_number="1"
                ip=$(ip -4 addr | grep inet | grep -vE '127(\.[0-9]{1,3}){3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | sed -n "$ip_number"p)
        fi
        # If $ip is a private IP address, the server must be behind NAT
        if echo "$ip" | grep -qE '^(10\.|172\.1[6789]\.|172\.2[0-9]\.|172\.3[01]\.|192\.168)'; then
                echo
                echo "This server is behind NAT. What is the public IPv4 address or hostname?"
                # Get public IP and sanitize with grep
                get_public_ip=$(grep -m 1 -oE '^[0-9]{1,3}(\.[0-9]{1,3}){3}$' <<< "$(wget -T 10 -t 1 -4qO- "http://ip1.dynupdate.no-ip.com/" || curl -m 10 -4Ls "http://ip1.dynupdate.no-ip.com/")")
                read -p "Public IPv4 address / hostname [$get_public_ip]: " public_ip
                # If the checkip service is unavailable and user didn't provide input, ask again
                until [[ -n "$get_public_ip" || -n "$public_ip" ]]; do
                        echo "Invalid input."
                        read -p "Public IPv4 address / hostname: " public_ip
                done
                [[ -z "$public_ip" ]] && public_ip="$get_public_ip"
        fi
        # If system has a single IPv6, it is selected automatically
        if [[ $(ip -6 addr | grep -c 'inet6 [23]') -eq 1 ]]; then
                ip6=$(ip -6 addr | grep 'inet6 [23]' | cut -d '/' -f 1 | grep -oE '([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}')
        fi
        # If system has multiple IPv6, ask the user to select one
        if [[ $(ip -6 addr | grep -c 'inet6 [23]') -gt 1 ]]; then
                number_of_ip6=$(ip -6 addr | grep -c 'inet6 [23]')
                echo
                echo "Which IPv6 address should be used?"
                ip -6 addr | grep 'inet6 [23]' | cut -d '/' -f 1 | grep -oE '([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}' | nl -s ') '
                read -p "IPv6 address [1]: " ip6_number
                until [[ -z "$ip6_number" || "$ip6_number" =~ ^[0-9]+$ && "$ip6_number" -le "$number_of_ip6" ]]; do
                        echo "$ip6_number: invalid selection."
                        read -p "IPv6 address [1]: " ip6_number
                done
                [[ -z "$ip6_number" ]] && ip6_number="1"
                ip6=$(ip -6 addr | grep 'inet6 [23]' | cut -d '/' -f 1 | grep -oE '([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}' | sed -n "$ip6_number"p)
        fi
        echo
        echo "Which protocol should OpenVPN use?"
        echo "   1) UDP (recommended)"
        echo "   2) TCP"
        read -p "Protocol [1]: " protocol
        until [[ -z "$protocol" || "$protocol" =~ ^[12]$ ]]; do
                echo "$protocol: invalid selection."
                read -p "Protocol [1]: " protocol
        done
        case "$protocol" in
                1|"")
                protocol=udp
                ;;
                2)
                protocol=tcp
                ;;
        esac
        echo
        echo "What port should OpenVPN listen to?"
        read -p "Port [1194]: " port
        until [[ -z "$port" || "$port" =~ ^[0-9]+$ && "$port" -le 65535 ]]; do
                echo "$port: invalid port."
                read -p "Port [1194]: " port
        done
        [[ -z "$port" ]] && port="1194"
        echo
        echo "Select a DNS server for the clients:"
        echo "   1) Current system resolvers"
        echo "   2) Google"
        echo "   3) 1.1.1.1"
        echo "   4) OpenDNS"
        echo "   5) Quad9"
        echo "   6) AdGuard"
        read -p "DNS server [1]: " dns
        until [[ -z "$dns" || "$dns" =~ ^[1-6]$ ]]; do
                echo "$dns: invalid selection."
                read -p "DNS server [1]: " dns
        done
        echo
        echo "Enter a name for the first client:"
        read -p "Name [client]: " unsanitized_client
        # Allow a limited set of characters to avoid conflicts
        client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
        [[ -z "$client" ]] && client="client"
        echo
        echo "OpenVPN installation is ready to begin."
        # Install a firewall if firewalld or iptables are not already available
        if ! systemctl is-active --quiet firewalld.service && ! hash iptables 2>/dev/null; then
                if [[ "$os" == "centos" || "$os" == "fedora" ]]; then
                        firewall="firewalld"
                        # We don't want to silently enable firewalld, so we give a subtle warning
                        # If the user continues, firewalld will be installed and enabled during setup
                        echo "firewalld, which is required to manage routing tables, will also be installed."
                elif [[ "$os" == "debian" || "$os" == "ubuntu" ]]; then
                        # iptables is way less invasive than firewalld so no warning is given
                        firewall="iptables"
                fi
        fi
        read -n1 -r -p "Press any key to continue..."
        # If running inside a container, disable LimitNPROC to prevent conflicts
        if systemd-detect-virt -cq; then
                mkdir /etc/systemd/system/openvpn-server@server.service.d/ 2>/dev/null
                echo "[Service]
LimitNPROC=infinity" > /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
        fi
        if [[ "$os" = "debian" || "$os" = "ubuntu" ]]; then
                apt-get update
                apt-get install -y --no-install-recommends openvpn openssl ca-certificates $firewall
        elif [[ "$os" = "centos" ]]; then
                yum install -y epel-release
                yum install -y openvpn openssl ca-certificates tar $firewall
        else
                # Else, OS must be Fedora
                dnf install -y openvpn openssl ca-certificates tar $firewall
        fi
        # If firewalld was just installed, enable it
        if [[ "$firewall" == "firewalld" ]]; then
                systemctl enable --now firewalld.service
        fi
        # Get easy-rsa
        easy_rsa_url='https://github.com/OpenVPN/easy-rsa/releases/download/v3.1.2/EasyRSA-3.1.2.tgz'
        mkdir -p /etc/openvpn/server/easy-rsa/
        { wget -qO- "$easy_rsa_url" 2>/dev/null || curl -sL "$easy_rsa_url" ; } | tar xz -C /etc/openvpn/server/easy-rsa/ --strip-components 1
        chown -R root:root /etc/openvpn/server/easy-rsa/
        cd /etc/openvpn/server/easy-rsa/
        # Create the PKI, set up the CA and the server and client certificates
        ./easyrsa --batch init-pki
        ./easyrsa --batch build-ca nopass
        ./easyrsa --batch --days=3650 build-server-full server nopass
        ./easyrsa --batch --days=3650 build-client-full "$client" nopass
        ./easyrsa --batch --days=3650 gen-crl
        # Move the stuff we need
        cp pki/ca.crt pki/private/ca.key pki/issued/server.crt pki/private/server.key pki/crl.pem /etc/openvpn/server
        # CRL is read with each client connection, while OpenVPN is dropped to nobody
        chown nobody:"$group_name" /etc/openvpn/server/crl.pem
        # Without +x in the directory, OpenVPN can't run a stat() on the CRL file
        chmod o+x /etc/openvpn/server/
        # Generate key for tls-crypt
        openvpn --genkey --secret /etc/openvpn/server/tc.key
        # Create the DH parameters file using the predefined ffdhe2048 group
        echo '-----BEGIN DH PARAMETERS-----
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 $vpnGW 255.255.255.0" > /etc/openvpn/server/server.conf
        # IPv6
        if [[ -z "$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
                ;;
        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
        # Enable net.ipv4.ip_forward for the system
        echo 'net.ipv4.ip_forward=1' > /etc/sysctl.d/99-openvpn-forward.conf
        # Enable without waiting for a reboot or service restart
        echo 1 > /proc/sys/net/ipv4/ip_forward
        if [[ -n "$ip6" ]]; then
                # Enable net.ipv6.conf.all.forwarding for the system
                echo "net.ipv6.conf.all.forwarding=1" >> /etc/sysctl.d/99-openvpn-forward.conf
                # Enable without waiting for a reboot or service restart
                echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
        fi
        if systemctl is-active --quiet firewalld.service; then
                # Using both permanent and not permanent rules to avoid a firewalld
                # reload.
                # We don't use --add-service=openvpn because that would only work with
                # the default port and protocol.
                firewall-cmd --add-port="$port"/"$protocol"
                firewall-cmd --zone=trusted --add-source=$vpnGW/24
                firewall-cmd --permanent --add-port="$port"/"$protocol"
                firewall-cmd --permanent --zone=trusted --add-source=$vpnGW/24
                # Set NAT for the VPN subnet
                firewall-cmd --direct --add-rule ipv4 nat POSTROUTING 0 -s $vpnGW/24 ! -d $vpnGW/24 -j SNAT --to "$ip"
                firewall-cmd --permanent --direct --add-rule ipv4 nat POSTROUTING 0 -s $vpnGW/24 ! -d $vpnGW/24 -j SNAT --to "$ip"
                if [[ -n "$ip6" ]]; then
                        firewall-cmd --zone=trusted --add-source=fddd:1194:1194:1194::/64
                        firewall-cmd --permanent --zone=trusted --add-source=fddd:1194:1194:1194::/64
                        firewall-cmd --direct --add-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to "$ip6"
                        firewall-cmd --permanent --direct --add-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to "$ip6"
                fi
        else
                # Create a service to set up persistent iptables rules
                iptables_path=$(command -v iptables)
                ip6tables_path=$(command -v ip6tables)
                # nf_tables is not available as standard in OVZ kernels. So use iptables-legacy
                # if we are in OVZ, with a nf_tables backend and iptables-legacy is available.
                if [[ $(systemd-detect-virt) == "openvz" ]] && readlink -f "$(command -v iptables)" | grep -q "nft" && hash iptables-legacy 2>/dev/null; then
                        iptables_path=$(command -v iptables-legacy)
                        ip6tables_path=$(command -v ip6tables-legacy)
                fi
                echo "[Unit]
Before=network.target
[Service]
Type=oneshot
ExecStart=$iptables_path -t nat -A POSTROUTING -s $vpnGW/24 ! -d $vpnGW/24 -j SNAT --to $ip
ExecStart=$iptables_path -I INPUT -p $protocol --dport $port -j ACCEPT
ExecStart=$iptables_path -I FORWARD -s $vpnGW/24 -j ACCEPT
ExecStart=$iptables_path -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
ExecStop=$iptables_path -t nat -D POSTROUTING -s $vpnGW/24 ! -d $vpnGW/24 -j SNAT --to $ip
ExecStop=$iptables_path -D INPUT -p $protocol --dport $port -j ACCEPT
ExecStop=$iptables_path -D FORWARD -s $vpnGW/24 -j ACCEPT
ExecStop=$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=$ip6tables_path -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" >> /etc/systemd/system/openvpn-iptables.service
                fi
                echo "RemainAfterExit=yes
[Install]
WantedBy=multi-user.target" >> /etc/systemd/system/openvpn-iptables.service
                systemctl enable --now openvpn-iptables.service
        fi
        # If SELinux is enabled and a custom port was selected, we need this
        if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$port" != 1194 ]]; then
                # Install semanage if not already present
                if ! hash semanage 2>/dev/null; then
                        if [[ "$os_version" -eq 7 ]]; then
                                # Centos 7
                                yum install -y policycoreutils-python
                        else
                                # CentOS 8 or Fedora
                                dnf install -y policycoreutils-python-utils
                        fi
                fi
                semanage port -a -t openvpn_port_t -p "$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 $port
resolv-retry infinite
nobind
persist-key
persist-tun
remote-cert-tls server
auth SHA512
cipher AES-256-CBC
ignore-unknown-option block-outside-dns
verb 3" > /etc/openvpn/server/client-common.txt
        # Enable and start the OpenVPN service
        systemctl enable --now openvpn-server@server.service
        # Generates the custom client.ovpn
        new_client
        echo
        echo "Finished!"
        echo
        echo "The client configuration is available in:" ~/"$client.ovpn"
        echo "New clients can be added by running this script again."
else
        clear
        echo "OpenVPN is already installed."
        echo
        echo "Select an option:"
        echo "   1) Add a new client"
        echo "   2) Revoke an existing client"
        echo "   3) Remove OpenVPN"
        echo "   4) Exit"
        read -p "Option: " option
        until [[ "$option" =~ ^[1-4]$ ]]; do
                echo "$option: invalid selection."
                read -p "Option: " option
        done
        case "$option" in
                1)
                        echo
                        echo "Provide a name for the client:"
                        read -p "Name: " unsanitized_client
                        client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
                        while [[ -z "$client" || -e /etc/openvpn/server/easy-rsa/pki/issued/"$client".crt ]]; do
                                echo "$client: invalid name."
                                read -p "Name: " unsanitized_client
                                client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' <<< "$unsanitized_client")
                        done
                        cd /etc/openvpn/server/easy-rsa/
                        ./easyrsa --batch --days=3650 build-client-full "$client" nopass
                        # Generates the custom client.ovpn
                        new_client
                        echo
                        echo "$client added. Configuration available in:" ~/"$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 "$client"
                                ./easyrsa --batch --days=3650 gen-crl
                                rm -f /etc/openvpn/server/crl.pem
                                cp /etc/openvpn/server/easy-rsa/pki/crl.pem /etc/openvpn/server/crl.pem
                                # CRL is read with each client connection, when OpenVPN is dropped to nobody
                                chown nobody:"$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 $vpnGW/24 '"'"'!'"'"' -d $vpnGW/24' | grep -oE '[^ ]+$')
                                        # Using both permanent and not permanent rules to avoid a firewalld reload.
                                        firewall-cmd --remove-port="$port"/"$protocol"
                                        firewall-cmd --zone=trusted --remove-source=$vpnGW/24
                                        firewall-cmd --permanent --remove-port="$port"/"$protocol"
                                        firewall-cmd --permanent --zone=trusted --remove-source=$vpnGW/24
                                        firewall-cmd --direct --remove-rule ipv4 nat POSTROUTING 0 -s $vpnGW/24 ! -d $vpnGW/24 -j SNAT --to "$ip"
                                        firewall-cmd --permanent --direct --remove-rule ipv4 nat POSTROUTING 0 -s $vpnGW/24 ! -d $vpnGW/24 -j SNAT --to "$ip"
                                        if grep -qs "server-ipv6" /etc/openvpn/server/server.conf; then
                                                ip6=$(firewall-cmd --direct --get-rules ipv6 nat POSTROUTING | grep '\-s fddd:1194:1194:1194::/64 '"'"'!'"'"' -d fddd:1194:1194:1194::/64' | grep -oE '[^ ]+$')
                                                firewall-cmd --zone=trusted --remove-source=fddd:1194:1194:1194::/64
                                                firewall-cmd --permanent --zone=trusted --remove-source=fddd:1194:1194:1194::/64
                                                firewall-cmd --direct --remove-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to "$ip6"
                                                firewall-cmd --permanent --direct --remove-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT --to "$ip6"
                                        fi
                                else
                                        systemctl disable --now openvpn-iptables.service
                                        rm -f /etc/systemd/system/openvpn-iptables.service
                                fi
                                if sestatus 2>/dev/null | grep "Current mode" | grep -q "enforcing" && [[ "$port" != 1194 ]]; then
                                        semanage port -d -t openvpn_port_t -p "$protocol" "$port"
                                fi
                                systemctl disable --now openvpn-server@server.service
                                rm -f /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
                                rm -f /etc/sysctl.d/99-openvpn-forward.conf
                                if [[ "$os" = "debian" || "$os" = "ubuntu" ]]; then
                                        rm -rf /etc/openvpn/server
                                        apt-get remove --purge -y openvpn
                                else
                                        # Else, OS must be CentOS or Fedora
                                        yum 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


help()
{
    sudo chmod u+x openvpn-install.sh
    ./openvpn-install.sh
    sudo cp /root/ubuntuvps.ovpn $HOME/
    sudo chown $USER:$USER ubuntuvps.ovpn
    
    echo "当前是help 帮助中心..."
    sudo openvpn --genkey --secret static-OpenVPN.key
    # 生成 vpn 密钥


}





 0  已被阅读了1386次  楼主 2023-05-15 00:02:28
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回复:ubuntu 安装 openVPN 脚本研究

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