An 'authorizer' grants users the privileges to manage users and policies by creating preliminary authorizations at startup.
Authorizers are configured using two properties in the nifi.properties file:
nifi.authorizer.configuration.fileproperty specifies the configuration file where authorizers are defined. By default, the authorizers.xml file located in the root installation conf directory is selected.
nifi.security.user.authorizerproperty indicates which of the configured authorizers in the authorizers.xml file to use.