The airport website for Quimper Cornouaille Airport doesn't seem to mention anything either way about Wi-Fi.
Is there free Wi-Fi available here, and if so, can you just access it or do you need to do something to get a login?
Yes, there is!
If you rummage through all the PDFs in the French bit of the airport website, you'll fine the details hidden in this brouchure. Alternately, just ask at the cafe/bar in the airport, they're very friendly and helpful there :)
You need to go to the information (l’accueil) desk, which doubles up as the Air France ticket desk (and is much better signed for the latter than the former!). If you ask there for a password, they'll take your name, wander back into the office and generate you a personal password for the day. You can then connect to the
aeroport Wi-Fi, trigger the captive portal, enter your password and get online.
However... It's a very small airport, and people there have multiple roles. So, if you want to get the password just as a flight is about to leave, you'll have to wait! (The staff who give out the password also help with flight dispatch) The good news is they're very friendly, and they'll come and find you with your password once the flight has gone!
Another cunning way to find out is to look on Foursquare.
Their page for Quimper Airport has the following tips:
So yes, they do have free Wi-Fi, ask at the Information desk for a password :)