centos7上搭建openv**centos7 上搭建openv**

2022-05-29 11:55:24 浏览数 (1)

1

背景

基于内外网隔离 网络审计 又因为最近疫情反复,很多小公司没有做好内外网网络隔离,也不能够远程办公。本文基于开源免费的openv**为大家提供一个参考。

由于网上的安装教程层次不齐,本文以第一视角one by one提供给大家

openv**实现的原理:openv**客户端通过证书及密钥的方式跟服务端建立安全的网络通信连接,然后创建虚拟网络,对服务目标内网进行静态路由的指定 从而达到网络层面的需求

2

服务器安装部署

2.1 安装openv**软件

第一:安装软件及开启内核路由转发功能

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yum install openvpn easy-rsa
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echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
sysctl -p

第二:准备目录配置文件

(easy-rsa-3.0.3 openv**-2.4.5 按具体的版本目录复制)

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cp /usr/share/doc/easy-rsa-3.0.3/vars.example /etc/openvpn/easy-rsa/vars
cp /usr/share/doc/openvpn-2.4.5/sample/sample-config-files/server.conf /etc/openvpn/

2.2 创建服务器端证书和key

1、目录初始化:

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cd /etc/openvpn/easy-rsa/
./easyrsa init-pki

2:创建根证书:

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./easyrsa build-ca
Enter PEM pass phrase:
 输入2次pem密码,并记住(输入的pem密码是openvpn,第4步有用);
........

回车后显示:

创建成功提示

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CA creation complete and you may now import and sign cert requests.
Your new CA certificate file for publishing is at:
/etc/openvpn/easy-rsa/pki/ca.crt

3:创建服务器端证书:

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./easyrsa gen-req server nopass
Common Name (eg: your user, host, or server name) [server]: (server)

创建成功提示

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Keypair and certificate request completed. Your files are:
req: /etc/openvpn/easy-rsa/pki/reqs/server.req
key: /etc/openvpn/easy-rsa/pki/private/server.key

4:签署服务器端证书

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./easyrsa sign server server
回车后,Confirm request details: (输入yes)
Enter pass phrase for /etc/openvpn/easy-rsa/pki/private/ca.key: 输入第2步的密码

创建成功提示

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Check that the request matches the signature
Signature ok
The Subject’s Distinguished Name is as follows
commonName :ASN.1 12:‘server’
Certificate is to be certified until Apr 4 06:24:29 2038 GMT (3650 days)


Write out database with 1 new entries
Data Base Updated

Certificate created at: /etc/openvpn/easy-rsa/pki/issued/server.crt

5:创建Diffie-Hellman,确保key穿越不安全网络的命令:

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./easyrsa gen-dh

回车后,会1分钟左右后最后显示:

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DH parameters of size 2048 created at /etc/openvpn/easy-rsa/pki/dh.pem

注意这个时候 最好cp一份2048(有些版本不兼容问题)

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cp dh.pem dh2048.pem

6:生成ta密钥文件

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openvpn --genkey --secret /etc/openvpn/easy-rsa/ta.key

2.3 创建客户端证书及key

2.3.1 创建客户证书

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mkdir /root/client
cd /root/client
cp -r /usr/share/easy-rsa/3.0.3/* ./
./easyrsa init-pki
./easyrsa gen-req client
Common Name (eg: your user, host, or server name) [client]: client(后面需要)

创建成功提示

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Keypair and certificate request completed. Your files are:
req: /root/client/pki/reqs/client.req
key: /root/client/pki/private/client.key

2.3.2 将得到的clientone.req导入然后签约证书:(在服务端里的/easyrsa)

目录(/etc/openvpn/easy-rsa)

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./easyrsa import-req /root/client/pki/reqs/client.req client

创建成功提示

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Note: using Easy-RSA configuration from: ./vars

The request has been successfully imported with a short name of: clientone
You may now use this name to perform signing operations on this request.

2.3.3:签约证书(服务目录操作)

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./easyrsa sign client client

回车后,输入yes;

Enter pass phrase for /etc/openvpn/easy-rsa/pki/private/ca.key: (输入的是client)

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Check that the request matches the signature
Signature ok
The Subject’s Distinguished Name is as follows
commonName :ASN.1 12:‘client’
Certificate is to be certified until Apr 4 16:38:37 2028 GMT (3650 days)

Write out database with 1 new entries
Data Base Updated

Certificate created at: /etc/openvpn/easy-rsa/pki/issued/client.crt

复制相关文件

拷贝服务器端所需文件到各自位置

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cp pki/ca.crt /etc/openvpn/
cp pki/private/server.key /etc/openvpn/
cp pki/issued/server.crt /etc/openvpn/
cp pki/dh.pem /etc/openvpn/
cp /etc/openvpn/easy-rsa/ta.key /etc/openvpn/

拷贝客户端所需文件到各种位置

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cp pki/ca.crt /root/client/
cp pki/issued/client.crt /root/client/
cp /root/client/pki/private/client.key /root/client/
cp /etc/openvpn/easy-rsa/ta.key  /root/client/

修改openv** server.conf配置

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egrep  -v "^$|^#|^;" /etc/openvpn/server.conf
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port 1194
proto udp
dev tun
ca /etc/openvpn/ca.crt
cert /etc/openvpn/server.crt
key /etc/openvpn/server.key  # This file should be kept secret
dh /etc/openvpn/dh.pem
server 10.8.0.0 255.255.255.0
ifconfig-pool-persist ipp.txt
push "redirect-gateway def1 bypass-dhcp"
push "dhcp-option DNS 8.8.8.8"
push "dhcp-option DNS 208.67.220.220"
keepalive 10 120
tls-auth ta.key 0 # This file is secret
cipher AES-256-CBC
comp-lzo
max-clients 100
persist-key
persist-tun
status openvpn-status.log
verb 3
explicit-exit-notify 1

3

启动openv**服务

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systemctl enable openvpn@server.service

systemctl start openvpn@server

systemctl status openvpn@server

写到最后:花在排版的时间远远比花的安装部署确认要多的多。希望对自己以后在小公司内部署openv** 有一个很好的总结,当然也希望对大家有帮忙和思考 。接下来我们讲一下更加宏观的网络层面的东西。这些非常基础,但是又不能没有。认知层面决定了我们运维的高度和考量。

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