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Description of problem: According to Common Criteria,

    Server certificates presented for TLS shall have the Server Authentication·
    purpose (id-kp 1 with OID 1.3.6.1.5.5.7.3.1) in the extendedKeyUsage field.

but our self-signed certificate does not have an EKU field, and not even a keyUsage.

In addition, as it's a self-signed certificate it should probably also have

           X509v3 Basic Constraints: 
                CA:TRUE

as it acts as its own CA. CC'ing Steve Grubb for confirming.

Compare this with sscg's certificates, which are much more complete. They are still missing EKU, though (see bug 1859810).

https://github.com/cockpit-project/cockpit/pull/14442

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 (cockpit bug fix and enhancement update), 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/RHBA-2020:4511