Re: What Does De-Reference Mean?

["Vithalprasad Gaitonde" <gvithalprasad@novell.com>]

Kurt,
Going by the same argument,  the rest of the search criteria e.g. the
base dn and scope of the search should also be applied after the alias
has been derferenced to the actual entry
So in the example below,

                  ou=deptB                                             
                     ou=deptA
                        |                                              
                                  |
             alias_teamA - - - - - - - - - - - - - - - - - - - - - - -
- -  - - - >ou= teamA
                                                                       
                                  |
                                                                       
                             ou= DT                                     
                                                             
                                                                       
                                  |
                                                                       
                             Computer object (objectClass=computer)
                                                                       
                                                                        
 
       Search Operation:
       set search base  = deptB               
       set search scope = subtree search 
       set deref aliases  = always
       search for objects of objectClass=computer

Computer object should not be returned as it does not qualify the scope
criteria for ou=deptb as the base.
Correct ?

Prasad

>>> "Kurt D. Zeilenga" <Kurt@OpenLDAP.org> 3/28/2003 5:12:53 AM >>>
It should be clear that each and every entry returned in
response to a search request did match the search filter.  That
is, if the filter is (CN=foo) than each entry returned has "foo"
as a (not necessarily returned) value of an attribute whose
type is CN or a subtype of CN.

When dereferencing during searching (by derefInSearching or
derefAlways), the filter should be matched against the entry which
the alias refers to, not the alias itself.

If the client asks for all alias objects, e.g, (objectClass=alias)
with dereferencing during finding enabled, then no entries should
be returned.  Likewise, when requesting (objectClass=*) with
dereferencing during finding enabled, none of entries returned
should belong to the alias objectClass.

So, to answer your specific question, it is not relevant to
the matching what values of CN the 'alias' has. The values
of the aliased entry are, however, quite relevant.

Kurt

 
At 11:22 AM 3/26/2003, Chris Harding wrote:
>Hi -
>
>The interpretation of the LDAP RFCs as regards dereferencing has
become an issue for the new certification program that The Open Group
plans to launch for LDAP servers. We have discussed it in the Directory
Interoperability Forum, and agreed that we should ask the experts in the
ldapbis group. Accordingly, I would like to ask your help in clarifying
this issue.
>
>Here's the issue. The requirement in the specification is:
>
>       When a server receives a search request with the derefAliases
field
>       set to derefInSearching then it will dereference aliases in
subordinates
>       of the base object in searching.
>
>We have a test suite for use in the certification program. The suite
includes a test of this requirement (which is in fact derived from a
test in BLITS). The test data includes two entries: Jonathan Adams and
Jonny Adams. The Jonny Adams entry is an alias for Jonathan Adams.
>
>The test should check that Jonny Adams is de-referenced and Jonathan
Adams is returned. The question is, should the test search for Jonny or
for Jonathan.
>
>RFC 2251 does not explain dereferencing but defers to X.501.
Unfortunately, X.501 does not seem to explain it very well. My personal
interpretation after reading it is that, whenever a server encounters an
alias entry in the course of a search and dereferencing has been
requested, the server should dereference the alias and carry on
searching from the entry that the alias points to. Under this
interpretation, a search for Jonny should return the same result as a
search for Jonathan - the Jonathan Adams entry.
>
>I don't claim to be an expert on the interpretation of the
specifications - but I hope that experts in the IETF community can shed
light on this!
>
>Please send your comments to the ldapbis list. I will report the
consensus (assuming that one is reached) to the DIF.
>
>Regards,
>
>Chris
>+++++
>
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>  T H E    Executive Director for the Directory Interoperability
Forum
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