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Re: "hidden" attributes in openldap?

On 16/03/2011 18:21, Andrew Findlay wrote:
On Wed, Mar 16, 2011 at 05:31:27PM +0200, George Mamalakis wrote:

I am trying to find a way to hide/unhide attributes on my DIT
(openldap-2.4.21) and I cannot find a way to do this. What I mean by
hide/unhide is that I want specific attributes to be listed with
ldapsearch only if the owner of the records agrees. I did not find
any feature that does this "automatically", so I tried to implement
it through acls. I created a group called i.e. "cn=publish
mail,ou=Groups,dc=example,dc=com" where people wishing to disclose
their emails are members of this group. On the acl statement I
couldn't find a way to restrict my acl based on "conditional
There are several ways to do that. See my paper on ACL
design for some examples:


Parts of section 10.5 might be useful, but as that is
a rather complex example I suggest you do not start


I haven't read your paper yet, but I will, since it seems very informing! I came up to a "partial solution" in the meantime that reads like this:

access to dn.subtree="ou=People,dc=example,dc=com" attrs=mail
        by anonymous none
        by self write
by set="this & [cn=Publish Mail,ou=Groups,dc=example,dc=com]/uniqueMember " read
        by * none

with this acl I manage to filter out anonymous users, allow self to change/add their mail and show everybody else the entry's mail, if the dn belongs to the specific group. Since anonymous is out, the rest of the users must be authenticated, and hence I 'converge' to my wished 'by users read'. It is not mathematically *exactly* what I wished for (I think...since I am not sure what other sort of users would exist, but the truth is that other dn's would be able -somehow- to access this tree...), but it is very, very, very close to it.

Now to your paper, do you propose a solution/example that does exactly what I wish? If so, is it located in section 10.5 explicitly or implicitly?

Thanx again for your immediate answer and help,


George Mamalakis

IT Officer
Electrical and Computer Engineer (Aristotle Un. of Thessaloniki),
MSc (Imperial College of London)

Department of Electrical and Computer Engineering
Faculty of Engineering
Aristotle University of Thessaloniki

phone number : +30 (2310) 994379