Verificando data expiração de um certificado a partir do serviço.

<code>
openssl s_client -connect ldap1.ic.unicamp.br:636> ldap-cert
openssl x509 -in ldap-cert -noout -enddate

</code>

Metodo 2

<code>
openssl s_client -showcerts -connect ldap2.lab.ic.unicamp.br:636 </dev/null 2>/dev/null> ldap2.lab.cert
openssl x509 -noout -text -in ldap2.lab.cert

</code>

NMAP SCAN :

<code>
nmap --script ssl-enum-ciphers -p 443 www.site.com.br

</code>

Outros metodos em: [[https://www.poftut.com/use-openssl-s_client-check-verify-ssltls-https-webserver/|https://www.poftut.com/use-openssl-s_client-check-verify-ssltls-https-webserver/]]