@Override
        public String getName() { return "ssl-auth-subject-username-attribute"; }
The property defining the LDAP attribute or attributes that may be used
to represent a username within the subject DN of a user's X.509
certificate. If the least-significant attribute of the subject DN is not
one of these attributes, the certificate will be rejected. By default,
any attribute is accepted.
extensions/guacamole-auth-sso/modules/guacamole-auth-sso-ssl/src/main/java/org/apache/guacamole/auth/ssl/conf/ConfigurationService.java