SSL인증서 CN 확인

방법

[root@zetawiki ~]# cat /etc/pki/ca-trust/extracted/pem/email-ca-bundle.pem | head
-----BEGIN CERTIFICATE-----
MIIE2DCCBEGgAwIBAgIEN0rSQzANBgkqhkiG9w0BAQUFADCBwzELMAkGA1UEBhMC
VVMxFDASBgNVBAoTC0VudHJ1c3QubmV0MTswOQYDVQQLEzJ3d3cuZW50cnVzdC5u
... (생략)
W9c3rkIO3aQab3yIVMUWbuF6aC74Or8NpDyJO3inTmODBCEIZ43ygknQW/2xzQ+D
hNQ+IIX3Sj0rnP0qCglN6oH4EZw=
-----END CERTIFICATE-----

[root@zetawiki ~]# openssl x509 -noout -subject -in /etc/pki/ca-trust/extracted/pem/email-ca-bundle.pem
subject= /C=US/O=Entrust.net/OU=www.entrust.net/CPS incorp. by ref. (limits liab.)/OU=(c) 1999 Entrust.net Limited/CN=Entrust.net Secure Server Certification Authority

[root@zetawiki ~]# openssl x509 -noout -subject -in /etc/pki/ca-trust/extracted/pem/email-ca-bundle.pem  | sed -n '/^subject/s/^.*CN=//p'
Entrust.net Secure Server Certification Authority