The basic LDAP ACL definition[7, Section 5.3] is shown below. Netscape's ACI has additional attributes.
<access directive> ::= access to <what> [by <who> <access>] + <what> ::= * | [dn=<regex>] [filter=<ldapfilter>] [attrs=<attrlist>] <who> ::= * | self | dn=<regex> | addr=<regex> | domain=<regex> | dnattr=<dn attribute> <access> ::= [self]none | [self]compare | [self]search | [self]read | [self]write
Samples of ACLs used in the facilities of this report, with some specifics replaced by generic qualifiers, are shown in Figure 8.
The first ACL restricts all access to the certifiedHost and
LDAP attributes defined in the LDAP entry for the special newsgroup
whose DN begins with the
Common Name value of
<newsgroup name>. Write, and read,
access are granted
to the person identified by the owner attribute, which is a
``pointer'' to another LDAP entry (DN). The person associated with the
(directory server) Manager DN is given the same access permission.
Access for these privileges requires LDAP password authentication, where the password is stored in the LDAP entry of the authenticating user. The news server using the LDAP database is allowed to read the restricted attributes by either authenticating as the news server LDAP entry DN, or by its IP address matching the value in the by addr specification. All other access attempts for the two specified attributes is denied.
The second ACL in Figure 8 restricts access to the MVSpasswd attribute defined in any LDAP entry. The previous ACL was limited to a single LDAP entry. Here the user (self) identified by their entry's DN and the LDAP administrator both have write and read access. The Samba server which uses the MVSpasswd data is allowed only read access, and its IP address must match that as given in the by addr specification. All other access attempts are denied.
After the owner of any restricted LDAP entry becomes familiar and comfortable with the process, the LDAP administrator may or may not be removed from the specific ACL. It is usually included initially to get the new service operating, and to provide a fall back in case the owner has problems updating their restricted data.