Re: links in a LDAP database

["Andreas Gabriel (HRZ)" <gabriel@hrz.uni-marburg.de>]

Marc Cuypers wrote:
> Adam Williams wrote:
>
> > > I'm new to LDAP.  I got an address book working, and it works fine.
> > > I was wondering if it is possible from one subtree to link to another 
> > > subtree in the hierarchical database, so that the same data can be 
> > > found under more the one subtree?
> >
> >
> >
> > Maybe you want to look at "referrals",  or maybe just the "seeAlso"
> > attribute.
> If i am right, seeAlso is just a reference to another entry in the LDAP 
> tree.  Referrals are used to split up the ldap-tree on more than one 
> server, so that every server handles only the queries for a piece of the 
> tree.
>
> What I'd like to do is the following.  Every subtree contains a set of 
> entries.  So a person with a search base dc=f1, dc=dm, dc=tld can see 
> the entries under dc=f1,dc=dm,dc=tld.  A person with searchbase dc=f2, 
> dc=dm, dc=tld can see other entries...
> I would like to put common entries under the tree dc=common,dc=dm,dc=tld 
> and make that every person how searches his searchbase can see all 
> entries under his searchbase and also those under the 'common' tree.

You can possibly use subentries with the objectclass alias
(RFC2256)


example:
your common tree is

dc=common,dc=dm,dc=tld

# subentrie of f1 that points to dc=common, dc=dm, dc=tld
dn: dc=common,dc=f1,dc=dm,dc=tld
objectclass: alias
objectclass: extensibleObject
dc: common
aliasedobjectname: dc=common, dc=dm, dc=tld

# subentrie of f2 that points to dc=common, dc=dm, dc=tld
dn: dc=common,dc=f2,dc=dm,dc=tld
objectclass: alias
objectclass: extensibleObject
dc: common
aliasedobjectname: dc=common, dc=dm, dc=tld

A ldapsearch with aliases dereferencing set to always
should resolve the subentries of f1 and f2.

So far I know aliases are only supported by the ldbm backend (not DB4).

Regards
A. Gabriel

> Is this possible?
>
> Marc

--
--  Andreas Gabriel
@AG Neurophysik ,Renthof 7, 35032 Marburg TEL/FAX +49 +6421 28-25683/27034
@HRZ, Hans-Meerwein-Str.  , 35032 Marburg TEL/FAX +49 +6421 28-23560/26994
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