通过命令： nmap -sV --script ssl-enum-ciphers -p 443 www.example.com 可得：
Starting Nmap 6.40 ( http://nmap.org ) at 2021-10-08 14:51 CST
Nmap scan report for 127.0.0.1
Host is up (0.035s latency).
PORT STATE SERVICE VERSION
443/tcp open http nginx 1.19.10
| ssl-enum-ciphers:
| TLSv1.2:
| ciphers:
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA - strong
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 - strong
| TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 - strong
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA - strong
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 - strong
| TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 - strong
| TLS_ECDHE_RSA_WITH_RC4_128_SHA - strong
| TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA - broken
| TLS_ECDH_anon_WITH_AES_128_CBC_SHA - broken
| TLS_ECDH_anon_WITH_AES_256_CBC_SHA - broken
| TLS_ECDH_anon_WITH_RC4_128_SHA - broken
| TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5 - weak
| TLS_RSA_EXPORT_WITH_RC4_40_MD5 - weak
| TLS_RSA_WITH_3DES_EDE_CBC_SHA - strong
| TLS_RSA_WITH_AES_128_CBC_SHA - strong
| TLS_RSA_WITH_AES_256_CBC_SHA - strong
| TLS_RSA_WITH_AES_256_CBC_SHA256 - strong
| TLS_RSA_WITH_AES_256_GCM_SHA384 - strong
| TLS_RSA_WITH_CAMELLIA_128_CBC_SHA - strong
| compressors:
| NULL
|_ least strength: strong
Service detection performed. Please report any incorrect results at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 8.09 seconds
结果中weak(柔弱的)、broken(损坏的)、strong(坚固的)字段表示加密强度，为了安全需要将128位以下弱加密算法禁用，Nginx 配置 SSL需明确指定算法：
ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:!NULL:!aNULL:!MD5:!3DES:!ADH:!RC4:!DH:!DHE;
重启是nginx.conf配置生效
nginx -s reload
网友评论