OpenVPN搭建:实现异地多设备组网

jupiter
2023-05-03 / 0 评论 / 361 阅读 / 正在检测是否收录...
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1.服务端一键安装脚本

wget https://nos-public.nos-eastchina1.126.net/vpn -O openvpn-install.sh && bash openvpn-install.sh

安装完毕后将 /root/ 下的 client.ovpn 文件,下载到本地导入 OpenVPN 客户端连接软件进行连接。

注意:

强烈建议不要使用默认的 VPN 端口 1194,建议修改为其他端口并防火墙开放该端口,使用云服务器的话还需要在安全组放行。

还需要继续创建其他的client.ovpn文件继续执行该脚本即可。

bash openvpn-install.sh

2.客户端连接

2.1 Linux

sudo apt-get install openvpn
openvpn client.ovpn
  • 开机自启动服务
sudo vim /etc/rc.local
# exit 0 前面加入如下内容
/usr/sbin/openvpn --config /root/client.ovpn &

2.2 windows使用

客户端下载地址:https://nos-public.nos-eastchina1.126.net/openvpn-install-2.4.6-I602.exe

image-20230503143557177

参考资料

  1. 搭建 OpenVPN

脚本内容备份openvpn-install.sh

#!/bin/bash
# OpenVPN road warrior installer for Debian, Ubuntu and CentOS

# This script will work on Debian, Ubuntu, CentOS and probably other distros
# of the same families, although no support is offered for them. It isn't
# bulletproof but it will probably work if you simply want to setup a VPN on
# your Debian/Ubuntu/CentOS box. It has been designed to be as unobtrusive and
# universal as possible.


# Detect Debian users running the script with "sh" instead of bash
if readlink /proc/$$/exe | grep -qs "dash"; then
    echo "This script needs to be run with bash, not sh"
    exit 1
fi

if [[ "$EUID" -ne 0 ]]; then
    echo "Sorry, you need to run this as root"
    exit 2
fi

if [[ ! -e /dev/net/tun ]]; then
    echo "The TUN device is not available
You need to enable TUN before running this script"
    exit 3
fi

if grep -qs "CentOS release 5" "/etc/redhat-release"; then
    echo "CentOS 5 is too old and not supported"
    exit 4
fi
if [[ -e /etc/debian_version ]]; then
    OS=debian
    GROUPNAME=nogroup
    RCLOCAL='/etc/rc.local'
elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
    OS=centos
    GROUPNAME=nobody
    RCLOCAL='/etc/rc.d/rc.local'
else
    echo "Looks like you aren't running this installer on Debian, Ubuntu or CentOS"
    exit 5
fi

newclient () {
    # Generates the custom client.ovpn
    cp /etc/openvpn/client-common.txt ~/$1.ovpn
    echo "<ca>" >> ~/$1.ovpn
    cat /etc/openvpn/easy-rsa/pki/ca.crt >> ~/$1.ovpn
    echo "</ca>" >> ~/$1.ovpn
    echo "<cert>" >> ~/$1.ovpn
    cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> ~/$1.ovpn
    echo "</cert>" >> ~/$1.ovpn
    echo "<key>" >> ~/$1.ovpn
    cat /etc/openvpn/easy-rsa/pki/private/$1.key >> ~/$1.ovpn
    echo "</key>" >> ~/$1.ovpn
    echo "<tls-auth>" >> ~/$1.ovpn
    cat /etc/openvpn/ta.key >> ~/$1.ovpn
    echo "</tls-auth>" >> ~/$1.ovpn
}

# Try to get our IP from the system and fallback to the Internet.
# I do this to make the script compatible with NATed servers (lowendspirit.com)
# and to avoid getting an IPv6.
IP=$(ip addr | grep 'inet' | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | grep -o -E '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1)
VPCSUBNETDEFAULT=$(route -n | grep eth0 | grep 255.255| awk '{print $1,$3}' | tail -n 1| awk '{print $1}')
VPCMASKDEFAULT=$(route -n | grep eth0 | grep 255.255| awk '{print $1,$3}' | tail -n 1| awk '{print $2}')

if [[ "$IP" = "" ]]; then
        IP=$(wget -4qO- "http://whatismyip.akamai.com/")
fi

if [[ -e /etc/openvpn/server.conf ]]; then
    while :
    do
    clear
        echo "Looks like OpenVPN is already installed"
        echo ""
        echo "What do you want to do?"
        echo "   1) Add a new user"
        echo "   2) Revoke an existing user"
        echo "   3) Remove OpenVPN"
        echo "   4) Exit"
        read -p "Select an option [1-4]: " option
        case $option in
            1) 
            echo ""
            echo "Tell me a name for the client certificate"
            echo "Please, use one word only, no special characters"
            read -p "Client name: " -e -i netease-b CLIENT
            cd /etc/openvpn/easy-rsa/
            ./easyrsa build-client-full $CLIENT nopass
            # Generates the custom client.ovpn
            newclient "$CLIENT"
            echo ""
            echo "Client $CLIENT added, configuration is available at" ~/"$CLIENT.ovpn"
            exit
            ;;
            2)
            # This option could be documented a bit better and maybe even be simplimplified
            # ...but what can I say, I want some sleep too
            NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep -c "^V")
            if [[ "$NUMBEROFCLIENTS" = '0' ]]; then
                echo ""
                echo "You have no existing clients!"
                exit 6
            fi
            echo ""
            echo "Select the existing client certificate you want to revoke"
            tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
            if [[ "$NUMBEROFCLIENTS" = '1' ]]; then
                read -p "Select one client [1]: " CLIENTNUMBER
            else
                read -p "Select one client [1-$NUMBEROFCLIENTS]: " CLIENTNUMBER
            fi
            CLIENT=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$CLIENTNUMBER"p)
            cd /etc/openvpn/easy-rsa/
            ./easyrsa --batch revoke $CLIENT
            EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
            rm -rf pki/reqs/$CLIENT.req
            rm -rf pki/private/$CLIENT.key
            rm -rf pki/issued/$CLIENT.crt
            rm -rf /etc/openvpn/crl.pem
            cp /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn/crl.pem
            # CRL is read with each client connection, when OpenVPN is dropped to nobody
            chown nobody:$GROUPNAME /etc/openvpn/crl.pem
            echo ""
            echo "Certificate for client $CLIENT revoked"
            exit
            ;;
            3) 
            echo ""
            read -p "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
            if [[ "$REMOVE" = 'y' ]]; then
                PORT=$(grep '^port ' /etc/openvpn/server.conf | cut -d " " -f 2)
                PROTOCOL=$(grep '^proto ' /etc/openvpn/server.conf | cut -d " " -f 2)
                if pgrep firewalld; then
                    IP=$(firewall-cmd --direct --get-rules ipv4 nat POSTROUTING | grep '\-s 10.8.0.0/24 '"'"'!'"'"' -d 10.8.0.0/24 -j SNAT --to ' | cut -d " " -f 10)
                    # Using both permanent and not permanent rules to avoid a firewalld reload.
                    firewall-cmd --zone=public --remove-port=$PORT/$PROTOCOL
                    firewall-cmd --zone=trusted --remove-source=10.8.0.0/24
                    firewall-cmd --permanent --zone=public --remove-port=$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 $IP
                else
                    IP=$(grep 'iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to ' $RCLOCAL | cut -d " " -f 14)
                    iptables -t nat -D POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
                    sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 ! -d 10.8.0.0\/24 -j SNAT --to /d' $RCLOCAL
                    if iptables -L -n | grep -qE '^ACCEPT'; then
                        iptables -D INPUT -p $PROTOCOL --dport $PORT -j ACCEPT
                        iptables -D FORWARD -s 10.8.0.0/24 -j ACCEPT
                        iptables -D FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
                        sed -i "/iptables -I INPUT -p $PROTOCOL --dport $PORT -j ACCEPT/d" $RCLOCAL
                        sed -i "/iptables -I FORWARD -s 10.8.0.0\/24 -j ACCEPT/d" $RCLOCAL
                        sed -i "/iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT/d" $RCLOCAL
                    fi
                fi
                if hash sestatus 2>/dev/null; then
                    if sestatus | grep "Current mode" | grep -qs "enforcing"; then
                        if [[ "$PORT" != '1194' || "$PROTOCOL" = 'tcp' ]]; then
                            semanage port -d -t openvpn_port_t -p $PROTOCOL $PORT
                        fi
                    fi
                fi
                if [[ "$OS" = 'debian' ]]; then
                    apt-get remove --purge -y openvpn
                else
                    yum remove openvpn -y
                fi
                rm -rf /etc/openvpn
                echo ""
                echo "OpenVPN removed!"
            else
                echo ""
                echo "Removal aborted!"
            fi
            exit
            ;;
            4) exit;;
        esac
    done
else
    clear
    echo 'Welcome to this quick OpenVPN "road warrior" installer'
    echo ""
    # OpenVPN setup and first user creation
    echo "I need to ask you a few questions before starting the setup"
    echo "You can leave the default options and just press enter if you are ok with them"
    echo ""
    echo "First I need to know the IPv4 address of the network interface you want OpenVPN"
    echo "listening to."
    read -p "IP address: " -e -i $IP IP
    echo ""    echo "Which protocol do you want for OpenVPN connections?"

    echo "   1) UDP (recommended)"
    echo "   2) TCP"
    read -p "Protocol [1-2]: " -e -i 1 PROTOCOL
    case $PROTOCOL in
        1) 
        PROTOCOL=udp
        ;;
        2) 
        PROTOCOL=tcp
        ;;
    esac
    echo ""
    echo "What port do you want OpenVPN listening to?"
    read -p "Port: " -e -i 1194 PORT
    echo ""
    echo "what VPC subnet?"
    read -p "VPC subnet(E.g 172.16.0.0): " -e -i $VPCSUBNETDEFAULT  VPCSUBNET
    echo ""
    echo "what VPC mask?"
    read -p "VPC mask(E.g 255.255.0.0): " -e -i $VPCMASKDEFAULT  VPCMASK
    echo ""
    # echo "Which DNS do you want to use with the VPN?"
    # echo "   1) Current system resolvers"
    # echo "   2) Google"
    # echo "   3) OpenDNS"
    # echo "   4) NTT"
    # echo "   5) Hurricane Electric"
    # echo "   6) Verisign"
    # read -p "DNS [1-6]: " -e -i 1 DNS
    # echo ""
    echo "Finally, tell me your name for the client certificate"
    echo "Please, use one word only, no special characters"
    read -p "Client name: " -e -i netease-b CLIENT
    echo ""
    echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now"
    read -n1 -r -p "Press any key to continue..."
    if [[ "$OS" = 'debian' ]]; then
        apt-get update
        apt-get install openvpn iptables openssl ca-certificates -y
    else
        # Else, the distro is CentOS
        yum install epel-release -y
        yum install openvpn iptables openssl wget ca-certificates -y
    fi
    # An old version of easy-rsa was available by default in some openvpn packages
    if [[ -d /etc/openvpn/easy-rsa/ ]]; then
        rm -rf /etc/openvpn/easy-rsa/
    fi
    # Get easy-rsa
    wget -O ~/EasyRSA-3.0.4.tgz "https://nos-public.nos-eastchina1.126.net/EasyRSA-3.0.4.tgz"
    tar xzf ~/EasyRSA-3.0.4.tgz -C ~/
    mv ~/EasyRSA-3.0.4/ /etc/openvpn/
    mv /etc/openvpn/EasyRSA-3.0.4/ /etc/openvpn/easy-rsa/
    chown -R root:root /etc/openvpn/easy-rsa/
    rm -rf ~/EasyRSA-3.0.4.tgz
    cd /etc/openvpn/easy-rsa/
    # Create the PKI, set up the CA, the DH params and the server + client certificates
    ./easyrsa init-pki
    ./easyrsa --batch build-ca nopass
    ./easyrsa gen-dh
    ./easyrsa build-server-full server nopass
    ./easyrsa build-client-full $CLIENT nopass
    EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
    # Move the stuff we need
    cp pki/ca.crt pki/private/ca.key pki/dh.pem pki/issued/server.crt pki/private/server.key pki/crl.pem /etc/openvpn
    # CRL is read with each client connection, when OpenVPN is dropped to nobody
    chown nobody:$GROUPNAME /etc/openvpn/crl.pem
    # Generate key for tls-auth
    openvpn --genkey --secret /etc/openvpn/ta.key
    # Generate server.conf
    echo "port $PORT
proto $PROTOCOL
dev tun
sndbuf 0
rcvbuf 0
ca ca.crt
cert server.crt
key server.key
dh dh.pem
auth SHA512
tls-auth ta.key 0
topology subnet
server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp.txt" > /etc/openvpn/server.conf
    echo "push \"route $VPCSUBNET $VPCMASK vpn_gateway\"" >> /etc/openvpn/server.conf
    echo "keepalive 10 120
cipher AES-256-CBC
comp-lzo
user nobody
group $GROUPNAME
persist-key
duplicate-cn
max-clients 10
persist-tun
status openvpn-status.log
verb 3
crl-verify crl.pem" >> /etc/openvpn/server.conf
    # Enable net.ipv4.ip_forward for the system
    sed -i '/\<net.ipv4.ip_forward\>/c\net.ipv4.ip_forward=1' /etc/sysctl.conf
    if ! grep -q "\<net.ipv4.ip_forward\>" /etc/sysctl.conf; then
        echo 'net.ipv4.ip_forward=1' >> /etc/sysctl.conf
    fi
    # Avoid an unneeded reboot
    echo 1 > /proc/sys/net/ipv4/ip_forward
    if pgrep firewalld; then
        # Using both permanent and not permanent rules to avoid a firewalld
        # reload.
        # We don't use --add-service=openvpn because that would only work with
        # the default port and protocol.
        firewall-cmd --zone=public --add-port=$PORT/$PROTOCOL
        firewall-cmd --zone=trusted --add-source=10.8.0.0/24
        firewall-cmd --permanent --zone=public --add-port=$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 $IP
    else
        # Needed to use rc.local with some systemd distros
        if [[ "$OS" = 'debian' && ! -e $RCLOCAL ]]; then
            echo '#!/bin/sh -e
exit 0' > $RCLOCAL
        fi
        chmod +x $RCLOCAL
        # Set NAT for the VPN subnet
        iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP
        sed -i "1 a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP" $RCLOCAL
        if iptables -L -n | grep -qE '^(REJECT|DROP)'; then
            # If iptables has at least one REJECT rule, we asume this is needed.
            # Not the best approach but I can't think of other and this shouldn't
            # cause problems.
            iptables -I INPUT -p $PROTOCOL --dport $PORT -j ACCEPT
            iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
            iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
            sed -i "1 a\iptables -I INPUT -p $PROTOCOL --dport $PORT -j ACCEPT" $RCLOCAL
            sed -i "1 a\iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT" $RCLOCAL
            sed -i "1 a\iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" $RCLOCAL
        fi
    fi
    # If SELinux is enabled and a custom port or TCP was selected, we need this
    if hash sestatus 2>/dev/null; then
        if sestatus | grep "Current mode" | grep -qs "enforcing"; then
            if [[ "$PORT" != '1194' || "$PROTOCOL" = 'tcp' ]]; then
                # semanage isn't available in CentOS 6 by default
                if ! hash semanage 2>/dev/null; then
                    yum install policycoreutils-python -y
                fi
                semanage port -a -t openvpn_port_t -p $PROTOCOL $PORT
            fi
        fi
    fi
    # And finally, restart OpenVPN
    if [[ "$OS" = 'debian' ]]; then
        # Little hack to check for systemd
        if pgrep systemd-journal; then
            systemctl restart openvpn@server.service
        else
            /etc/init.d/openvpn restart
        fi
    else
        if pgrep systemd-journal; then
            systemctl restart openvpn@server.service
            systemctl enable openvpn@server.service
        else
            service openvpn restart
            chkconfig openvpn on
        fi
    fi
    # Try to detect a NATed connection and ask about it to potential LowEndSpirit users
    EXTERNALIP=$(wget -4qO- "http://whatismyip.akamai.com/")
    if [[ "$IP" != "$EXTERNALIP" ]]; then
        echo ""
        echo "Looks like your server is behind a NAT!"
        echo ""
        echo "If your server is NATed (e.g. LowEndSpirit), I need to know the external IP"
        echo "If that's not the case, just ignore this and leave the next field blank"
        read -p "External IP: " -e -i $EXTERNALIP USEREXTERNALIP
        if [[ "$USEREXTERNALIP" != "" ]]; then
            IP=$USEREXTERNALIP
        fi
    fi
    # client-common.txt is created so we have a template to add further users later
    echo "client
dev tun
proto $PROTOCOL
sndbuf 0
rcvbuf 0
remote $IP $PORT
resolv-retry infinite
nobind
max-clients 10
persist-key
persist-tun
remote-cert-tls server
auth SHA512
cipher AES-256-CBC
comp-lzo
#setenv opt block-outside-dns
key-direction 1
auth-nocache
verb 3" > /etc/openvpn/client-common.txt
    # Generates the custom client.ovpn
    newclient "$CLIENT"
    echo ""
    echo "Finished!"
    echo ""
    echo "Your client configuration is available at" ~/"$CLIENT.ovpn"
    echo "If you want to add more clients, you simply need to run this script again!"
fi
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