in lib/omniauth/strategies/ldap.rb [33:41]
def request_phase
OmniAuth::LDAP::Adaptor.validate @options
f = OmniAuth::Form.new(:title => (options[:title] || "LDAP Authentication"), :url => callback_path)
f.text_field 'Login', 'username'
f.password_field 'Password', 'password'
f.button "Sign In"
f.to_response
end