What would be the best way to implement a login audit?

I'm developing an intranet application where one of the requested
features is having a detailed log containing entries of IP, user and
timestamp every time someone has logged in successfully. Also as a
bonus feature I'd like to implement a log of failed login attempts.
What would be the cleanest approach to do this?
Wrap the login view in contrib.auth with my own?
Or write a custom auth backend?

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