Bind using a user other than organizationalRole user

[Marcelo de Moraes Serpa <celoserpa@gmail.com>]

Hello list,

I have a local OpenLDAP server with a couple of users. I'm using it for development purposes, here's the ldif:

#Top level - the organization
dn: dc=site, dc=com
dc: site
description: OneLogin LLC
objectClass: dcObject
objectClass: organization
o: OneLogin LLC

#Top level - manager
dn: cn=Manager, dc=site, dc=com
objectClass: organizationalRole
cn: Manager

#Second level - organizational units
dn: ou=people, dc=site, dc=com
ou: people
description: All people in the organization
objectClass: organizationalunit

dn: ou=groups, dc=site, dc=com
ou: groups
description: All groups in the organization
objectClass: organizationalunit

#Third level - people
dn: uid=celoserpa, ou=people, dc=site, dc=com
objectclass: pilotPerson
objectclass: uidObject
uid: celoserpa
cn: Marcelo de Moraes Serpa
sn: de Moraes Serpa
userPassword: secret_12345
mail: marcelo@site.com

So far, so good. I can bind with "cn=Manager,dc=site,dc=com" and the 12345678 password (the local server password, setup on slapd.conf). 

However, I would like to bind with any user in under the people OU. In this case, I'd like to bind with:
  dn: uid=celoserpa, ou=people, dc=site, dc=com
  userPassword: secret_12345

But I'm getting a (49) - Invalid Credentials error everytime. I have tried through CLI tools (such as ldapadd, ldapwhoami, etc) and also ruby/ldap. The bind with these credentials fails with a invalid credentials error. 

I was suspecting that maybe OpenLDAP doesn't compare against userPassword? Or maybe some ACL configuration I am missing that is somehow affecting the read access to userPassword for the specific DN. 

I'm really lost here, any suggestion appreciated!

Cheers,

Marcelo.