Sure.
I have a page on ldap that might be useful.
http://home.roadrunner.com/~computertaijutsu/ldap.html
Depending upon the distribution, the default can be access to * by * read, which you probably don't want. See the section in the above link about access control. As mentioned in the article, it doesn't always work as expected, so after configuring access lists, do test it by running slapd -d 128 and testing. (As explained in the article.)