On my 6.2.1 search head, the following is the best I could do. It needs a bit of cleaning up, but the gist is there:
(eventtype=splunk_access tag=authentication) OR (((index=_internal UiAuth) OR (index=_internal sourcetype=splunk_web_service)) action=login OR action=logout) user=* | table _time, action, user, clientip, status
I can't seem to find the client ip for any successful commands. That worries me. Once a user does searches, the client ip does get logged, however. I haven't yet checked to see if this captures SDK connections as well.
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