# 如何用 CURL 看证书信息

- Link: https://www.ixiqin.com/2021/09/05/how-to-use-curl-to-see-certificate-information/
- Published: 2021-09-05T19:29:34+08:00
- Author: 白宦成

在进行证书故障排查的时候，难免要查看证书信息。不过目前的浏览器在设计上，查看证书
详情变得困难很多，因此，你可以借助 CURL 来查看证书信息。

具体的命令

    ```javascript
     curl --insecure -v https://域名 2>&1 | awk 'BEGIN { cert=0 } /^\* SSL connection/ { cert=1 } /^\*/ { if (cert) print }'
    Code language: JavaScript (javascript)
    ```

返回结果如下，其中包含了域名证书当中的过期时间、申请者等核心信息，方便你进行排查。

    ```php
    ➜  ~  curl --insecure -v https://www.ixiqin.com 2>&1 | awk 'BEGIN { cert=0 } /^\* SSL connection/ { cert=1 } /^\*/ { if (cert) print }'
    * SSL connection using TLSv1.2 / ECDHE-RSA-CHACHA20-POLY1305
    * ALPN, server accepted to use h2
    * Server certificate:
    *  subject: CN=www.ixiqin.com
    *  start date: Aug 15 00:00:00 2021 GMT
    *  expire date: Nov 13 23:59:59 2021 GMT
    *  issuer: C=AT; O=ZeroSSL; CN=ZeroSSL RSA Domain Secure Site CA
    *  SSL certificate verify ok.
    * Using HTTP2, server supports multi-use
    * Connection state changed (HTTP/2 confirmed)
    * Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
    * Using Stream ID: 1 (easy handle 0x7fe096810a00)
    * Connection state changed (MAX_CONCURRENT_STREAMS == 128)!
    * Connection #0 to host www.ixiqin.com left intact
    * Closing connection 0
    Code language: PHP (php)
    ```