基于Let’s Encrypt证书实现nginx https双向认证

第一步，先基于Let’s Encrypt证书配置https单向校验的网站出来先

wget https://dl.eff.org/certbot-auto

chmod u+x certbot-auto

./certbot-auto certonly --standalone -m abc@yubangweb.com --agree-tos -d abc.yubangweb.com

修改nginx的配置

server {
        listen 80;
        listen 443 ssl;
        server_name abc.yubangweb.com;
        root /var/web;

        ssl_certificate /etc/letsencrypt/live/abc.yubangweb.com/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/abc.yubangweb.com/privkey.pem;
        ssl_trusted_certificate /etc/letsencrypt/live/abc.yubangweb.com/chain.pem;

        location / {
        }
}

然后打开浏览器，访问：https://abc.yubangweb.com/
这个时候就配置好了单向校验的https网站

第二步，就是自签客户端证书

# 签服务端证书
openssl genrsa -des3 -out ca.key 4096
openssl genrsa -out ca.key 4096 
openssl req -new -x509 -days 365 -key ca.key -out ca.crt

# 签客户端证书
openssl genrsa -out client.key 4096 
openssl req -new -key client.key -out client.csr
openssl x509 -req -days 365 -in client.csr -CA ca.crt -CAkey ca.key -set_serial 01 -out client.crt
openssl pkcs12 -export -clcerts -in client.crt -inkey client.key -out client.p12
openssl pkcs12 -in client.p12 -out all.pem -nodes

第三步，nginx启用客户端证书校验

# 在刚才的配置文件添加这两行
ssl_client_certificate /root/ssl/ca.crt;
ssl_verify_client on;

测试一下客户端证书是否生效（在其它机器执行下面命令）

# 注意复制上面生成的all.pem文件
curl -k --cert all.pem  https://abc.yubangweb.com

完整的nginx配置：

server {
        listen 80;
        listen 443 ssl;
        server_name abc.yubangweb.com;
        root /var/web;

        ssl_certificate /etc/letsencrypt/live/abc.yubangweb.com/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/abc.yubangweb.com/privkey.pem;
        ssl_trusted_certificate /etc/letsencrypt/live/abc.yubangweb.com/chain.pem;

        ssl_client_certificate /root/ssl/ca.crt;
        ssl_verify_client on;

        location / {
        }
}

如果需要控制某些请求需要客户端证书校验，则使用下列方法

server {
        listen 80;
        listen 443 ssl;
        server_name abc.yubangweb.com;
        root /var/web;

        ssl_certificate /etc/letsencrypt/live/abc.yubangweb.com/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/abc.yubangweb.com/privkey.pem;
        ssl_trusted_certificate /etc/letsencrypt/live/abc.yubangweb.com/chain.pem;

        ssl_client_certificate /root/ssl/ca.crt;
        ssl_verify_client optional;

        location / {
            if ($ssl_client_verify != SUCCESS) {
                return 401;
            }
        }
        
        location /abc {
        
        }
        
}