内网使用mkcert签名证书

简介

mkcert 是一个用于生成本地自签名 SSL 证书的开源工具，项目基于 Golang 开发，可跨平台使用，不需要配置，支持多域名以及自动信任 CA。

请注意，自签名的证书只在开发和测试环境中使用，并不适用于生产环境。在生产环境中，你应该使用由受信任的证书颁发机构（CA）签名的证书。

准备工作

局域网内访问 Web 服务的场景，因此开始前需要：

• 服务器：用于提供 Web 服务，安装 nginx 并开启 SSL，系统为 CentOS 7.8。
• PC 端：一台 Win10 电脑，用于测试访问，与服务器处于同一局域网。

下载安装

wget -O mkcert https://github.com/FiloSottile/mkcert/releases/download/v1.4.4/mkcert-v1.4.4-linux-amd64

赋权验证

cp mkcert-v1.4.4-linux-amd64  /usr/local/bin/mkcert
chmod +x /usr/local/bin/mkcert
mkcert -version

生成证书文件

[root@centos-77 ~]# mkcert 192.168.3.77 127.0.0.1 ::1 localhost
Created a new local CA 💥
Note: the local CA is not installed in the system trust store.
Note: the local CA is not installed in the Firefox and/or Chrome/Chromium trust store.
Run "mkcert -install" for certificates to be trusted automatically ⚠️ 
 
Created a new certificate valid for the following names 📜
 - "192.168.3.77"
 - "127.0.0.1"
 - "::1"
 - "localhost"
 
The certificate is at "./192.168.3.77+3.pem" and the key at "./192.168.3.77+3-key.pem" ✅
 
It will expire on 14 October 2025 🗓

由于服务器上已经装了nginx，命令中可以加入 -cert-file 和 -key-file 参数，将文件直接生成到对应的目录里：

生成证书文件到nginx目录

[root@centos-77 ~]# mkcert -cert-file /etc/nginx/certs/server.crt -key-file /etc/nginx/certs/server.key 192.168.3.77 127.0.0.1 ::1 localhost
Note: the local CA is not installed in the system trust store.
Note: the local CA is not installed in the Firefox and/or Chrome/Chromium trust store.
Run "mkcert -install" for certificates to be trusted automatically ⚠️ 
 
Created a new certificate valid for the following names 📜
 - "192.168.3.77"
 - "127.0.0.1"
 - "::1"
 - "localhost"
 
The certificate is at "/etc/nginx/certs/server.crt" and the key at "/etc/nginx/certs/server.key" ✅
 
It will expire on 14 October 2025 🗓

配置nginx

mkdir -p /etc/nginx/certs

    server {
        listen       80;
        listen       [::]:80;
        rewrite ^(.*)$ https://$host$1 permanent;
}
    server {
        listen      443 ssl;
        server_name  _;
        ssl_certificate /etc/nginx/certs/server.crt;
        ssl_certificate_key /etc/nginx/certs/server.key;

nginx -t
nginx -s reload

mkcert的认证机构安装到服务器上

[root@centos-77 ~]# mkcert -install
The local CA is now installed in the system trust store! ⚡️ 
The local CA is now installed in the Firefox and/or Chrome/Chromium trust store (requires browser restart)! 🦊

查看CA证书的位置

[root@centos-77 ~]# mkcert -CAROOT
/root/.local/share/mkcert

该目录中有两个文件：rootCA-key.pem 和 rootCA.pem。将 rootCA.pem 复制到 PC 上，并将其后缀改为 .crt。

双击 rootCA.crt，根据提示安装证书，步骤如下：

浏览器访问验证，看到连接已经变为安全：