Centos7搭建OpenVPN服务器

2023-07-21 19:55:10

Windows下同时连接多个VPN的话，需要以管理员身份运行 C:\Program Files\TAP-Windows\bin\addtap.bat 添加虚拟网络适配器

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1、安装OpenVPN

首先从EPEL安装OpenVPN：
# yum install openvpn easy-rsa -y

2、使用easy-rsa创建服务端与客户端证书及密钥

服务端的创建：

服务器配置完成后需要生成密钥和证书，通过Easy RSA安装的一些脚本，方便快速产生密钥和证书；

创建keys文件夹，并且拷贝Easy RSA密钥和证书生成脚本到目录下(到easy-rsa目录)

# mkdir -p /etc/openvpn/key_server# cp -rf /usr/share/easy-rsa/3.0.3/*  /etc/openvpn/key_server/
# cp /usr/share/doc/easy-rsa-3.0.3/vars.example  /etc/openvpn/key_server/vars

为方便后续使用，按需要修改/etc/openvpn/easy-rsa/vars文件中的默认信息。

vi /etc/openvpn/easy-rsa/vars

　　　set_var EASYRSA_REQ_COUNTRY "US"
　　　set_var EASYRSA_REQ_PROVINCE "California"
　　　set_var EASYRSA_REQ_CITY "San Francisco"
　　　set_var EASYRSA_REQ_ORG "Copyleft Certificate Co"
　　　set_var EASYRSA_REQ_EMAIL "me@example.net"
　　　set_var EASYRSA_REQ_OU "My Organizational Unit"

# cd /etc/openvpn/key_server

# ./easyrsa init-pki nopass

# ./easyrsa build-ca nopass 输入CN

# ./easyrsa gen-req server nopass 输入CN

# ./easyrsa sign server server

# ./easyrsa gen-dh 创建Diffie-Hellman，时间会有点长，耐心等待

客户端的创建：

# cp -r /etc/openvpn/key_server /etc/openvpn/key_client

# ./easyrsa init-pki nopass

# ./easyrsa gen-req client nopass

进入服务端key_server目录，关联客户端req，使之向服务端注册

# cd ../key_server

# ./easyrsa import-req /etc/openvpn/key_client/pki/reqs/client.req client

# ./easyrsa sign client client

如果出现报错：TXT_DB error number 2 ，则

# rm -f /etc/openvpn/key_server/pki/index.txt

# touch /etc/openvpn/key_server/pki/index.txt

3、整理生成的证书

# cp /etc/openvpn/key_server/pki/ca.crt /etc/openvpn/server/
# cp /etc/openvpn/key_server/pki/private/server.key /etc/openvpn/server/
# cp /etc/openvpn/key_server/pki/issued/server.crt /etc/openvpn/server/
# cp /etc/openvpn/key_server/pki/dh.pem /etc/openvpn/server/

# cp /etc/openvpn/key_server/pki/ca.crt /etc/openvpn/client/
# cp /etc/openvpn/key_server/pki/issued/client.crt /etc/openvpn/client/
# cp /etc/openvpn/key_client/pki/private/client.key /etc/openvpn/client/

4、打开服务器的ip路由转发功能，并配置防火墙

# vim /etc/sysctl.conf

net.ipv4.ip_forward = 1

# sysctl -p

# yum install iptables-services

# systemctl stop firewalld ; systemctl mask firewalld ; systemctl start iptables

# iptables -F ; iptables -P INPUT ACCEPT

# iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j MASQUERADE ( iptables -t nat -L )

# service iptables save

5、服务端配置，指定相关ca、crt、key文件

从示例配置文件复制一份配置文件到/etc/openvpn

# cp /usr/share/doc/openvpn-*/sample/sample-config-files/server.conf /etc/openvpn
# vim /etc/openvpn/server.conf ( cat server.conf | grep -v ^$ | grep -v ^# | grep -v "^;" )

port
proto udp
dev tun
ca /etc/openvpn/server/ca.crt
cert /etc/openvpn/server/server.crt
key /etc/openvpn/server/server.key  # This file should be kept secret
dh /etc/openvpn/server/dh.pem
server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp.txt
push "route 172.17.0.0 255.255.0.0"   #向客户端推送需要访问的路由信息duplicate-cn       #定义openvpn一个证书在同一时刻是否允许多个客户端接入，默认没有启用。
keepalive  120tls-auth ta.key 0  #服务端设置为0 客户端设置为1
cipher AES--CBC
user nobody
group nobody
persist-key
persist-tun
status openvpn-status.log
verb

生成ta.key ，与server.conf放在同一层目录下

# cd /etc/openvpn ; openvpn --genkey --secret ta.key

测试该配置文件是否正确:

# openvpn /etc/openvpn/server.conf

6、编辑客户端配置文件 client.ovpn

client
dev tun
proto udp
remote *
resolv-retry infinite
nobind
persist-key
persist-tun
ca ca-myxb.crt
cert myxb.crt
key myxb.keytls-auth ta.key 1
cipher AES--CBC
;comp-lzo
verb

7、启动OpenVPN服务

# systemctl enable openvpn@server.service

# systemctl start openvpn@server.service

8、添加用户名和密码验证

# vim /etc/openvpn/server.conf 添加

auth-user-pass-verify /etc/openvpn/checkpsw.sh via-env
username-as-common-name
script-security 3

创建用于验证用户登录的脚本和用户名密码认证文件

# vim /etc/openvpn/checkpsw.sh

#!/bin/sh
###########################################################
# checkpsw. Mathias Sundman <mathias@openvpn.se>
#
# This script will authenticate OpenVPN users against
# a plain text file. The passfile should simply contain
# one row per user with the username first followed by
# one or more space(s) or tab(s) and then the password.

PASSFILE="/etc/openvpn/psw-file"
LOG_FILE="/etc/openvpn/openvpn-password.log"
TIME_STAMP=`date "+%Y-%m-%d %T"`

###########################################################

if [ ! -r "${PASSFILE}" ]; then
  echo "${TIME_STAMP}: Could not open password file \"${PASSFILE}\" for reading." >> ${LOG_FILE}
  exit
fi

CORRECT_PASSWORD=`awk '!/^;/&&!/^#/&&$1=="'${username}'"{print $2;exit}' ${PASSFILE}`

if [ "${CORRECT_PASSWORD}" = "" ]; then
  echo "${TIME_STAMP}: User does not exist: username=\"${username}\", password=\"${password}\"." >> ${LOG_FILE}
  exit
fi

if [ "${password}" = "${CORRECT_PASSWORD}" ]; then
  echo "${TIME_STAMP}: Successful authentication: username=\"${username}\"." >> ${LOG_FILE}
  exit
fi

echo "${TIME_STAMP}: Incorrect password: username=\"${username}\", password=\"${password}\"." >> ${LOG_FILE}
exit

# vim /etc/openvpn/psw-file

wjoyxt

# touch /etc/openvpn/openvpn-password.log

# chown nobody:nobody checkpsw.sh psw-file openvpn-password.log

# chmod 744 checkpsw.sh ; chmod 400 psw-file

修改客户端配置文件

# vim client.ovpn 增加

auth-user-pass pass.txt

重启服务后生效

# cat pass.txt

wjoyxt
wjoyxt666

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优化client.ovpn，合并证书到配置文件中

删除或者注释掉以下几行内容：
在这里我把它们注释掉：
ca ca.crt　　      改为：#ca ca.crt
cert client.crt　　改为：#cert client.crt
key client.key　 　改为：#key client.key
tls-auth ta.key 

在最后面添加以下内容：
<ca>
ca.crt文件内容
</ca>
<cert>
client.crt文件内容
</cert>
<key>
client.key文件内容
</key>
key-direction 1
<tls-auth>
ta.key文件内容
</tls-auth>

复制各文件里的内容到相应的位置即可！保存退出！！

参考资料：https://yq.aliyun.com/articles/43247

https://www.cnblogs.com/ilanni/p/4695112.html

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