Redmine/app/views/settings/_authentication.html.erb

<%= form_tag({:action => 'edit', :tab => 'authentication'}) do %>

<div class="box tabular settings">
<p><%= setting_select :login_required, [[l(:label_login_required_yes), "1"],
                                        [l(:label_login_required_no), "0"]] %>
  <em class="info"><%= t(:text_login_required_html, anonymous_role_path: edit_role_path(Role.anonymous)) %></em>
</p>

<p><%= setting_select :autologin, [[l(:label_disabled), 0]] + [1, 7, 30, 365].collect{|days| [l('datetime.distance_in_words.x_days', :count => days), days.to_s]} %></p>

<p><%= setting_select :self_registration, [[l(:label_disabled), "0"],
                                           [l(:label_registration_activation_by_email), "1"],
                                           [l(:label_registration_manual_activation), "2"],
                                           [l(:label_registration_automatic_activation), "3"]],
                      :onchange =>
                          "if (this.value != '0') { $('#settings_show_custom_fields_on_registration').removeAttr('disabled'); } else { $('#settings_show_custom_fields_on_registration').attr('disabled', true); }" %></p>

<p><%= setting_check_box :show_custom_fields_on_registration,
                         :disabled => !Setting.self_registration? %></p>

<p><%= setting_text_field :password_min_length, :size => 6 %></p>

<p><%= setting_multiselect :password_required_char_classes, Setting::PASSWORD_CHAR_CLASSES.keys.collect {|c| [l("label_password_char_class_#{c}"), c]} , :inline => true %></p>

<p>
  <%= setting_select :password_max_age, [[l(:label_disabled), 0]] + [7, 30, 60, 90, 180, 365].collect{|days| [l('datetime.distance_in_words.x_days', :count => days), days.to_s]} %>
</p>

<p><%= setting_check_box :lost_password %></p>

<p>
  <%= setting_select :twofa, [[l(:label_disabled), "0"],
                              [l(:label_optional), "1"],
                              [l(:label_required_administrators), "3"],
                              [l(:label_required_lower), "2"]] -%>
  <em class="info">
    <%= t 'twofa_hint_disabled_html', label: t(:label_disabled) -%><br/>
    <%= t 'twofa_hint_optional_html', label: t(:label_optional) -%><br/>
    <%= t 'twofa_hint_required_administrators_html', label: t(:label_required_administrators) -%><br/>
    <%= t 'twofa_hint_required_html', label: t(:label_required_lower) -%>
  </em>
</p>

</div>

<fieldset class="box">
  <legend><%= l(:label_session_expiration) %></legend>

  <div class="tabular settings">
    <p><%= setting_select :session_lifetime, session_lifetime_options %></p>
    <p><%= setting_select :session_timeout, session_timeout_options %></p>
  </div>

  <p><em class="info"><%= l(:text_session_expiration_settings) %></em></p>
</fieldset>

<%= submit_tag l(:button_save) %>
<% end %>