{
  "rules": [
    {
      "helper": "openssl",
      "template": "CN={{subject.krbprincipalname.0.partition('/')[2].partition('@')[0]}}"
    },
    {
      "helper": "certutil",
      "template": "CN={{subject.krbprincipalname.0.partition('/')[2].partition('@')[0]|quote}}"
    }
  ],
  "options": {
    "data_source": "subject.krbprincipalname.0.partition('/')[2].partition('@')[0]"
  }
}