Configure foreman with login: false, try hammer:

undefined method `user' for nil:NilClass (NoMethodError)
/home/lzap/work/foreman/app/controllers/api/base_controller.rb:81:in `authorize'
/home/lzap/.rbenv/versions/1.9.3-p327/lib/ruby/gems/1.9.1/gems/activesupport-3.2.14/lib/active_support/callbacks.rb:420:in `block (2 levels) in _run__3776958164675687506__process_action__3032593481822066504__callbacks'
/home/lzap/.rbenv/versions/1.9.3-p327/lib/ruby/gems/1.9.1/gems/activesupport-3.2.14/lib/active_support/callbacks.rb:215:in `block in _conditional_callback_around_1291'
/home/lzap/work/foreman/app/models/concerns/foreman/thread_session.rb:33:in `clear_thread'
/home/lzap/.rbenv/versions/1.9.3-p327/lib/ruby/gems/1.9.1/gems/activesupport-3.2.14/lib/active_support/callbacks.rb:214:in `_conditional_callback_around_1291'