Complicated realm problem

Question

Hello,
I have to write a WebLogic realm that ist based on a backend like this
one:
public interface UserContainer {
public boolean containsUser (String userName, String password);
i.e. the backend contains a number of users, represented by
(username,password) tuples, and one can ask the backend whether or not
it contains a specific user.
There is no way to get a list of all users contained in the backend
I now wanted to map all the backend's users into a group, so I could
uniformly apply permissions to them. However, as one can't get a list
of the users, I can't imagine how to implement the getGroup(String
name) method in my realm...?
So I came up with a different solution: I map all the user entries in
the backend to a single generic weblogic user named "GenericUser": In
the authUserPassword(String name, String password) method of my realm,
I query the backend whether it contains (name,password) and if so, I
just return a new weblogic.security.acl.User("GenericUser") (else, I
return null).
This works so far, but there is a problem: I'm using the realm in a
servlet-driven web application. From inside the servlet, I have to
know the "real" name and the password of the currently authenticated
user, i.e. the "name" and "password" values that were passed to my
authUserPassword() method when the user was authenticated. If I call
request.getUserPrincipal().getName() from inside the servlet, it
returns "GenericUser" (no surprise). So I wrote a subclass
"MappingUser" which inherits from weblogic.security.acl.User and adds
the fields "actualName" and "actualPassword", like this:
public class MappingUser extends weblogic.security.acl.User {
private String mActualName;
private String mActualPassword;
public MappingUser (String pName, String pActualName, String pActualPassword) {
super (pName);
mActualName = pActualName;
mActualPassword = pActualPassword;
public String getActualName() {
return mActualName;
public String getActualPassword() {
return mActualPassword;
From authUserPassword(String name, String password) I now return a new
MappingUser ("GenericUser", name,password). However: when I now call
request.getUserPrincipal() from within my servlet, it still returns an
object whose dynamic type is weblogic.security.acl.User . Somehow my
MappingUser got lost on its way from authUserPasword to
request.getUserPrincipal (obviously, it was statically copied into a
weblogic.security.acl.User, so my subclass attributes were not
retained).
Could somebody shed some light please? How could I get to know the
name and password of the currently authenticated user from within my
servlets, given the above backend?
I'm using WLS 5.1 .
Thanks in advance,
Olaf
Olaf Klischat | Fraunhofer ISST
Oberfeldstrasse 132 | Mollstrasse 1
12683 Berlin, Germany | 10178 Berlin, Germany
phone: [phone] | mail: [email protected]

Answer 1

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happy holidays