176 lines
4.9 KiB
Markdown
176 lines
4.9 KiB
Markdown
---
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title: "CentOS7 安装 Openvpn"
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date: 2019-10-30T01:12:40+08:00
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lastmod: 2019-10-30T01:12:40+08:00
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tags: ["openvpn"]
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categories: ["network"]
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---
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# 环境
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角色 | 主机名 | 操作系统 | IP
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---- | ---- | ---- | ----
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vpn 服务端 | vpn-server | CentOS7 | 192.168.1.90
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vpn 客户端 | vpn-client | CentOS7 | 192.168.1.91
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# 两台服务器初始准备
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- 关闭 SELinux
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- 关闭防火墙或放行 udp 端口 1194
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- 安装 openvpn
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```bash
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yum install epel-release
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yum clean all
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yum makecache fast
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yum install easy-rsa openvpn
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```
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# 在 vpn-server 上创建证书
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- 复制 easy-rsa 脚本到 /opt/easy-rsa/ 下
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```bash
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cp -af /usr/share/easy-rsa/3.0.3/ /opt/easy-rsa
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# vars 文件包含证书相关配置，可修改
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cp /usr/share/doc/easy-rsa-3.0.3/vars.example /opt/easy-rsa/vars
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```
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- 初始化 pki 目录结构
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```bash
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cd /opt/easy-rsa
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./easyrsa init-pki
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```
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- 生成免密 ca 证书
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```bash
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# 使用默认 common name 即可
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./easyrsa build-ca nopass
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```
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- 生成服务端免密证书
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```bash
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# 参数 my-server0 指定生成的客户端证书文件名及其 common name
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./easyrsa build-server-full my-server0 nopass
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```
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- 生成客户端免密证书
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```bash
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# 参数 my-client0 指定生成的客户端证书文件名及其 common name
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# 不同的客户端需指定不同的 common name
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# 方便在 client-conf-dir 目录下创建对应的同名客户端配置文件
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./easyrsa build-client-full my-client0 nopass
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```
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- 生成 dh.pem
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```bash
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./easyrsa gen-dh
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```
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- 生成 ta.key
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```bash
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openvpn --genkey --secret pki/ta.key
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```
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- 查看证书目录
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```
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/opt/easy-rsa/
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├── easyrsa
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├── openssl-1.0.cnf
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├── pki
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│ ├── ca.crt
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│ ├── certs_by_serial
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│ │ ├── 1835C740AD1421868300998618C0641F.pem
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│ │ └── 4F3AF1ED7D42ED56CCF26CC7622F4F50.pem
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│ ├── dh.pem
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│ ├── index.txt
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│ ├── index.txt.attr
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│ ├── index.txt.attr.old
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│ ├── index.txt.old
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│ ├── issued
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│ │ ├── my-client0.crt
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│ │ └── my-server0.crt
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│ ├── private
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│ │ ├── ca.key
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│ │ ├── my-client0.key
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│ │ └── my-server0.key
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│ ├── reqs
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│ │ ├── my-client0.req
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│ │ └── my-server0.req
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│ ├── serial
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│ ├── serial.old
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│ └── ta.key
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├── vars
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└── x509-types
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├── ca
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├── client
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├── COMMON
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├── san
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└── server
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```
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- **该证书目录 /opt/easyrsa 需妥善保管，后期增加其他客户端证书时会用到**
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# 配置 vpn-server
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- 开启路由转发，修改 /etc/sysctl.conf
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```bash
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sysctl -w 'net.ipv4.ip_forward = 1'
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sysctl -p
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```
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- 复制服务端证书到 openvpn 配置目录下
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```bash
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mkdir -p /etc/openvpn/server/my-server0/
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cd /opt/easy-rsa/pki
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cp ca.crt dh.pem issued/my-server0.crt private/my-server0.key ta.key \
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/etc/openvpn/server/my-server0/
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```
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- 创建 /etc/openvpn/server/my-server0.conf
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```bash
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cd /usr/share/doc/openvpn-2.4.7/sample/sample-config-files
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cp server.conf /etc/openvpn/server/my-server0.conf
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```
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- 修改 /etc/openvpn/server/my-server0.conf
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```
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ca my-server0/ca.crt
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cert my-server0/my-server0.crt
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key my-server0/my-server0.key
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dh my-server0/dh.pem
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tls-auth my-server0/ta.key 0
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```
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# 启动 vpn-server 服务
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- 启动 openvpn-server@my-server0.service 服务
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```bash
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systemctl start openvpn-server@my-server0.service
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```
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- 如需提供 ca 密码
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```bash
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systemd-tty-ask-password-agent --query
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```
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# 配置 vpn-client
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- 复制 vpn-server 上的客户端证书到 openvpn 配置目录下
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```bash
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mkdir -p /etc/openvpn/client/my-client0
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scp vpn-server:/opt/easy-rsa/pki/{ca.crt,issued/my-client0.crt,private/my-client0.key,ta.key} /etc/openvpn/client/my-client0/
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```
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- 创建 /etc/openvpn/client/my-client0.conf
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```bash
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cd /usr/share/doc/openvpn-3.0.3/sample/sample-config-files
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cp client.conf /etc/openvpn/client/my-client0.conf
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```
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- 修改 /etc/openvpn/client/my-client0.conf
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```
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remote 192.168.1.90 1194 # vpn server 地址
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ca my-client0/ca.crt
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cert my-client0/client.crt
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key my-client0/client.key
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tls-auth my-client0/ta.key 1
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```
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# 启动 vpn-client 服务
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- 启动 openvpn-client@my-client0 服务
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```bash
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systemctl start openvpn-client@my-client0.service
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```
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- 如需提供 ca 密码
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```bash
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systemd-tty-ask-password-agent --query
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```
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# 验证
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- vpn server 新增网卡 tun0，地址是 10.8.0.1/24
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- vpn client 新增网卡 tun0，地址是 10.8.0.2/24
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# 参考
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- [创建证书](https://blog.csdn.net/zhuwei_clark/article/details/87949043)
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