Syntax of the userdn Keyword

The userdn keyword uses this syntax:

userdn = "ldap:///dn [|| ldap:///dn]..."
userdn != "ldap:///dn [|| ldap:///dn]..."

The userdn keyword can alternatively be expressed as an LDAP URL filter. For information about expressing the userdn keyword as an LDAP URL, see LDAP URLs in the userdn Keyword.

dn can have of the following values:

distinguished-name

A fully qualified DN. Characters that are syntactically significant for a DN, such as commas, must be escaped with a single backslash (\). The wild card * can be used to specify a set of users. For example, if the following user DN is specified, users with a bind DN beginning with the letter b are allowed or denied access:

uid=b*,dc=example,dc=com

anyone

Allows or denies access for anonymous and authenticated users, regardless of the circumstances of the bind.

This access can be limited to specific types of access (for example, access for read or access for search) or to specific subtrees or individual entries within the directory. The following ACI on the dc=example,dc=com node allows anonymous access to read and search the entire dc=example,dc=com tree.

aci: (version 3.0; acl "anonymous-read-search"; 
 allow (read, search) userdn = "ldap:///anyone";)

all

Allows or denies access for authenticated users. This all value prevents anonymous access. The following ACI on the dc=example,dc=com node allows authenticated users to read the entire dc=example,dc=com tree:

aci: (version 3.0; acl "all-read"; 
 allow (read) userdn="ldap:///all";)

self

Allows or denies users access to their own entries if the bind DN matches the DN of the targeted entry. The following ACI on the dc=example,dc=com node allows authenticated users in the dc=example,dc=com tree to write to their userPassword attribute.

aci: (targetattr = "userPassword") 
 (version 3.0; acl "modify own password"; allow (write) 
 userdn = "ldap:///self";)

parent

Allows or denies users access to the entry if the bind DN is the parent of the targeted entry.

The following ACI on the dc=example,dc=com node allows authenticated users in the dc=example,dc=com tree to modify any child entries of their bind DN:

aci: (version 3.0; acl "parent access"; 
 allow (write) userdn="ldap:///parent";)