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20.8. Checking Account Availability for Passwordless Access

Most of the time, for the Directory Server to return authentication information about a user account, a client actually binds (or attempts to bind) as that user. And a bind attempt requires some sort of user credentials, usually a password or a certificate. While the Directory Server allows unauthenticated binds and anonymous binds, neither of those binds returns any user account information.
There are some situations where a client requires information about a user account — specifically whether an account should be allowed to authenticate — in order to perform some other operation, but the client either does not have or does use any credentials for the user account in Directory Server. Essentially, the client needs to perform a credential-less yet authenticated bind operation to retrieve the user account information (including password expiration information, if the account has a password).
This can be done through an ldapsearch by passing the Account Usability Extension Control. This control acts as if it performs an authenticated bind operation for a given user and returns the account status for that user — but without actually binding to the server. This allows a client to determine whether that account can be used to log in and then to pass that account information to another application, like PAM.
For example, using the Account Usability Extension Control can allow a system to use the Directory Server as its identity back end to store user data but to employ password-less authentication methods, like smart cards or SSH keys, where the authentication operation is performed outside Directory Server.

20.8.2. Changing What Users Can Perform an Account Usability Search
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By default, only the Directory Manager can use the Account Usability Extension Control. Other users can use the Account Usability Extension Control by setting the appropriate ACI on the supported control entry. The control entry is named for the Account Usability Extension Control OID, 1.3.6.1.4.1.42.2.27.9.5.8.
For example, to enable members of the cn=Administrators,ou=groups,dc=example,dc=com group to read the Account Usability Extension Control of all users: 
# ldapmodify -D "cn=Directory Manager" -W -x

dn: oid=1.3.6.1.4.1.42.2.27.9.5.8,cn=features,cn=config
changetype: modify
add: aci
aci: (targetattr = "*")(version 3.0; acl "Account Usable"; allow (read)(groupdn = "ldap:///cn=Administrators,ou=groups,dc=example,dc=com");)
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