Paul uses an E modal tuning for this. E-B-E-E-B-E
He used this tuning in a lot of his songs as did many of his contempoaries back then like Stephen Stills' Suite Judy Blue Eyes.
As for the chording on the song with that tuning, I'm not sure.
There was a songbook published back in 68 I believe that had all the chords, including the tunings that Paul used, for After Bathing At Baxters. Very cool songbook.
Unfortunately, my copy disintegrated many, many years ago like some alien material from outer space.
I believe you might be able to find one on eBay.