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Cloned from upstream: https://pagure.io/freeipa/issue/6652

To improve performance of the vault, we should consider to cache the transport cert. The transport cert is used to wrap the session key for vault payload with the public RSA key of the KRA's transport cert.

## client

ipaclient.plugin.vault


            # retrieve transport certificate
            config = self.api.Command.vaultconfig_show()['result']
            transport_cert_der = config['transport_cert']
            nss_transport_cert = nss.Certificate(transport_cert_der)


## server

```ipaserver.plugins.vault```


            kra_client = self.api.Backend.kra.get_client()
            transport_cert = kra_client.system_certs.get_transport_cert()
            config = {'transport_cert': transport_cert.binary}


The method ```get_transport_cert``` performs another HTTPS connection to retrieve the KRA transport cert from Dogtag.

## Caching

The KRA transport cert should be cached on both server side and client side, but at least on the client side. Perhaps it is possible to use certmonger to track the cert and have it automatically reloaded when it is renewed?

Upstream ticket:
https://pagure.io/freeipa/issue/6652

Upstream ticket:
https://pagure.io/freeipa/issue/6787

*** Bug 1436715 has been marked as a duplicate of this bug. ***

master:
    98bb5397c535e5e1a6c5ade9f0fb918be1d282c3 vault: cache the transport certificate on client

master:
    abefb64bea8ea1b8487ad87716e4a335555d19dc Simplify KRA transport cert cache

ipa-4-5:
    2723b5fa5edc75901c8fbaf110a37c87df0aec87 Simplify KRA transport cert cache

Verified using IPA version :: ipa-server-4.5.0-13.el7.x86_64

Verified using basic sanity tests and integration tests.

Marking BZ as verified. See console.log for sanity tests.

Created attachment 1284998 [details]
console.log

Created attachment 1284999 [details]
console.log

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/RHBA-2017:2304