Newbie: How does the security manager work with EJB?

Hi,
I am new to J2EE and do not seem to grasp how the security manager (or J2EESecurityManager) works with EJB.
My bean does security-senisitive stuff (like getting the Policy object) and must not do so unless I give it permission in the policy file. So far so good. But the permission will only work if I grant it to ALL code, like:
grant {
permission java.security.SecurityPermission "getPolicy";
Beans do not seem to have a protection domain or code source/certificates attached to it. so I cannot say
grant "/file/sw/ejb/myejb.jar" {
permission java.security.SecurityPermission "getPolicy";
Why is that (probably because beans run remote)? But more importantly, how DO I set permissions based on which bean it is?

If I add that directory as the codebase to
a grant statement any class loaded from there will
have the specified permission.I thought so, too, and that is why I went digging for the code source of my bean (i.e. where is it deployed, from where is it loaded) but that source is NULL:
Some program output:
==Has security manager: com.sun.enterprise.J2EESecurityManager
==Code source is ProtectionDomain (null <no certificates>)
The code seems to have no code source (null) and no signatures (in fact, I also signed my code with the keytool but that certificate did not show here either).
I am running this against the j2ee server 1.3 -- just experimenting, but it does not go so well. :-)

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