Certificate to principal mapping

In JBoss 7 it is no longer possible to configure how a certificate is mapped to a principal using client-cert authentication. The dynamic code was removed in JBoss 7 in the JBossWebRealm and is now hard coded to use the SubjectDNMapping:
http://grepcode.com/file/repository.jboss.org/nexus/content/repositories/releases/org.jboss.jbossas/jboss-as-tomcat/6.1.0.Final/org/jboss/web/tomcat/security/JBossWebRealm.java
http://grepcode.com/file/repository.jboss.org/nexus/content/repositories/releases/org.jboss.as/jboss-as-web/7.0.1.Final/org/jboss/as/web/security/JBossWebRealm.java

Also the JBossWebRealm does only consider role- but no principal-mapping modules.

We use this to authenticate users against an ldap server where the dn of the user doesn't match the dn in the ldap server. Also it's useful for display purpose in an application.
An example and some further information is in the linked user form thread.