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From "Rory Douglas (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-1719) Make the extraction of Session UserIDs from Subjects configurable
Date Tue, 19 Aug 2008 15:11:44 GMT
Make the extraction of Session UserIDs from Subjects configurable
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                 Key: JCR-1719
                 URL: https://issues.apache.org/jira/browse/JCR-1719
             Project: Jackrabbit
          Issue Type: New Feature
          Components: jackrabbit-core, security
    Affects Versions: core 1.4.5, 1.5
            Reporter: Rory Douglas
            Priority: Minor


The SessionImpl class must extract a string name from the Prinicpals in a Subject to use as
the Session userID.  In 1.4 the SessionImpl class directly selects the first available Principal.
 In 1.5, this is delegated to the SecurityManager, which chooses the first  non-group principal.

It would be useful to be able to configure specific selection criteria for the Principal used
for the Session userID.  A simple mechanism would involve specifying a Principal implementation
classname in the configuration, and the first instance of that class found in the Subject
would be used for the userID.  One way to implement this in 1.4 would be to extend AuthContext
to include a method getSessionPrincipal() which encapsulates the selection logic, and adding
an option the LoginModuleConfig to specify the class name of the Principal to select.

A particular use case is using the LDAP LoginModule from Sun JDK 6 with the repository.  The
first Principal LdapLoginModule populates into the Subject is an instance of LdapPrincipal,
which renders the userID as the full DN of the user.  The LoginModule also adds an instance
of UserPrincipal, whose name is the simple username/uid attribute, which would be more appropriate
as the Session userId since it corresponds to the username provided by the user to application
authentication mechanisms (the provided username is expanded into the full DN prior to authentication
by the login module).  If the above configuration mechanism were available, one could configure
the LdapLoginModule, and specify that the userID be extracted from the first instance of com.sun.security.auth.UserPrincipal.
 Since rewriting LoginModules is not always possible or desirable, this change would enable
the stable integration of 3rd-party login modules that may populate the Subject with several
principals
 .

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