authenticate (Net::SSH::Authentication::Methods::Password)

        # File lib/net/ssh/authentication/methods/password.rb, line 14
    14:           def authenticate(next_service, username, password=nil)
    15:             return false unless password
    16:
    17:             send_message(userauth_request(username, next_service, "password", false, password))
    18:             message = session.next_message
    19:
    20:             case message.type
    21:               when USERAUTH_SUCCESS
    22:                 debug { "password succeeded" }
    23:                 return true
    24:               when USERAUTH_FAILURE
    25:                 debug { "password failed" }
    26:                 return false
    27:               when USERAUTH_PASSWD_CHANGEREQ
    28:                 debug { "password change request received, failing" }
    29:                 return false
    30:               else
    31:                 raise Net::SSH::Exception, "unexpected reply to USERAUTH_REQUEST: #{message.type} (#{message.inspect})"
    32:             end
    33:           end