By default, FDS will restrict access to everything - that is, you don't need to have an explicit deny unless you have another ACI somewhere that allows other attributes. ACIs work together in this way - when there is a rule that allows some access and a rule that explicitly denies that same access, the deny rule wins. In your case, if this is the only ACI, you don't need the deny clause, you could just do this:
(target = "ldap:///ou=People, dc=ite,dc=gmu,dc=edu")
(targetattr ="employeeNumber")
(version 3.0;acl "EmployeeNumber";
allow (read) userdn="ldap:///self" and authmethod="sasl gssapi";
)

Alastair Neil wrote:

I am struggling with setting ACIs to restrict access to certain attributes
I would like the employeenumber attribute to be visible only to the user and
only if they are authenticated via sasl gssapi. I have tried several varients of the following:

(target = "ldap:///ou=People, dc=ite,dc=gmu,dc=edu")
(targetattr ="employeeNumber")
(version 3.0;acl "EmployeeNumber";
deny (all) userdn="ldap:///anyone" |
allow (read) userdn="ldap:///self" and authmethod="sasl gssapi";
)

this one seems to deny access regardless of the authmethod or bindbd used.

Anyone got any pointers?
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