You want to set up passwordless keys for ssh. Automating entering the password is tedious, you will have to use Expect for that, or possibly use a Perl ssh client, like one of those that can be found through SSH. I recommend simply using passwordless keys.

Ooops - I just realized that you want/need to accept the hosts fingerprints. I don't know any way other than Expect for that, except finding the fingerprint via other means, and storing it in the .ssh/known_hosts file yourself.