/usr/share/chef-server-webui/app/views/openid_login/index.html.haml is in chef-server-webui 10.12.0+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #login-form
%form{ :method => "get", :action => url(:openid_login_submit) }
%input{ :type => "text", :name => "username" }/
%input{ :type => "submit", :value => "Log In"}/
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