Получаем вывод для основного сертификата
openssl x509 -in 3_user.crt -noout -text | egrep "Subject:|Issuer:"
Issuer: C=US, O=GeoTrust Inc., CN=GeoTrust SSL CA - G3
Subject: C=RU, ST=Kirovskaya obl., L=Kirov, O=Limited Liability Company Baxet, CN=*.justhost.ru
Получаем вывод о промежуточных сертификатах
$ openssl x509 -in ../../../../ssl/GeoTrustSSLCA-G3.crt -noout -text | egrep "Subject:|Issuer:"
Issuer: C=US, O=GeoTrust Inc., CN=GeoTrust Global CA
Subject: C=US, O=GeoTrust Inc., CN=GeoTrust SSL CA - G3
$ openssl x509 -in ../../../../ssl/GeoTrustGlobalCA.crt -noout -text | egrep "Subject:|Issuer:"
Issuer: C=US, O=GeoTrust Inc., CN=GeoTrust Global CA
Subject: C=US, O=GeoTrust Inc., CN=GeoTrust Global CA