SSH Based Authentication

ssh_based_authentication.sh

# https://forums.freebsd.org/threads/howto-setting-up-public-key-password-less-ssh-access.1508/
# http://unix.stackexchange.com/questions/42643/ssh-key-based-authentication-known-hosts-vs-authorized-keys
# https://www.digitalocean.com/community/tutorials/how-to-configure-ssh-key-based-authentication-on-a-freebsd-server

# Generate key on client
ssh-keygen -t rsa

# Generate key on server
ssh-keygen -t rsa

# Get public key on client
cat ~/.ssh/id_rsa.pub

# Add to authorized_keys on server
nano ~/.ssh/authorized_keys
# --> paste client public key

# connect from client to server
ssh -p 2222 someuser@somehost
# type 'yes' to accept server and add key to ~/.ssh/known_hosts file

#########################

# Add client public key to authorized_keys file of server
ssh-copy-id -i ~/.ssh/id_rsa.pub -p 2222 someuser@somehost
cat ~/.ssh/id_rsa.pub | ssh -p 2222 someuser@somehost "cat >> ~/.ssh/authorized_keys"