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Description of problem:
katello-certs-check does not ensures certificate has SubjectAltName. SubjectAltName is required in order to the browser accept the certificate.

Version-Release number of selected component (if applicable):
Satellite 6.2.11

How reproducible:
100% always

Steps to Reproduce:
1. Create a certificate following the steps depicted in 
https://access.redhat.com/documentation/en-us/red_hat_satellite/6.2/html-single/installation_guide/index#configuring_satellite_server_with_custom_server_certificate
2. Import the Certificate

Actual results:
SSL session fails

Expected results:
katello-certs-check should check for the SubjectAltName and bar the certificate import.

Additional info:

Since Chrome version 58, subjectAltNames are required.

See [1] for further information


[1] - https://support.google.com/chrome/a/answer/7391219?hl=en

Verified on Satellite 6.4 snap 13, Subject Alt Name and Key Usage checks have been added and query the cert as expected

Setting requires_doc_text to '?'.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2018:2927