安装openvpn和easyrsa

sudo apt install openvpn easy-rsa

创建openpn-ca目录和复制程序文件

mkdir openvpn-ca

ln -s /usr/share/easy-rsa/easyrsa ./

ln -s /usr/share/easy-rsa/x509-types ./

cp /usr/share/easy-rsa/openssl-easyrsa.cnf ./

cp /usr/share/easy-rsa/vars.example vars

添加配置到vars文件

set_var EASYRSA_REQ_COUNTRY “US”

set_var EASYRSA_REQ_PROVINCE “CA”

set_var EASYRSA_REQ_CITY “SanFrancisco”

set_var EASYRSA_REQ_ORG “Code Order”

set_var EASYRSA_REQ_EMAIL “[email protected]”

set_var EASYRSA_REQ_OU “Code Order Unit”

创建用来存储证书、密钥和相关文件的pki目录

./easyrsa init-pki

生成根证书和密钥

./easyrsa build-ca nopass

生成服务器证书和密钥

./easyrsa gen-req server nopass

签署服务器证书

./easyrsa sign server server

生成客户端的证书和密钥

./easyrsa gen-req redmibookpro15 nopass

签署客户端证书

./easyrsa sign client redmibookpro15

生成Diffie-Hellman参数以加强OpenVPN的安全性

./easyrsa gen-dh

生成用于加密控制通道的TLS密钥

openvpn --genkey secret ta.key

服务端配置文件

cat server.conf
port 48385
proto udp
dev tun
ca ca.crt
cert server.crt
key server.key
dh dh.pem
auth SHA256
tls-auth ta.key 0
key-direction 0
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 8.8.4.4"
keepalive 10 120
cipher AES-256-CBC
user nobody
group nogroup
persist-key
persist-tun
status openvpn-status.log
verb 3
explicit-exit-notify 1
client-to-client