OmniAuth strategy for authenticating with Kerberos.
Install manually or using Bundler:
gem 'omniauth-krb5', :git => 'https://github.com/naffis/omniauth-krb5.git'
Add Kerberos provider to omniauth builder:
use OmniAuth::Builder do provider :krb5, "CUSTOM.REALM.COM" # provider ... end