openssl

Usage

# 生成自签名证书。所有提示输入均可以全部回车跳过
openssl req  -nodes -new -x509  -keyout server.key -out server.cert

# 连接 https 服务器并查看其证书信息。connect 地址的域名只用于获取 IP。
# With SNI
openssl s_client -showcerts -servername example.com -connect example.com:443 | openssl x509 -text
# Without SNI
openssl s_client -showcerts -connect example.com:443 | openssl x509 -text