The authmethod keyword is used to specify that a client must bind to the directory by using a specific authentication method. The authmethod keyword uses this syntax:
authmethod = "authentication_method"
The authmethod keyword can have the following values:
Authentication is not checked during bind rule evaluation. This is the default.
The bind rule is evaluated to be true if the client is accessing the directory using a username and password.
The client must bind to the directory over a Secure Sockets Layer (SSL) or Transport Layer Security (TLS) connection.
The bind rule is evaluated to be true if the client authenticates to the directory by using a certificate over LDAPS. It will not be true if the client authenticates by using simple authentication (bind DN and password) over LDAPS.
The bind rule is evaluated to be true if the client authenticates to the directory by using one of the following SASL mechanisms: DIGEST-MD5, GSSAPI, or EXTERNAL.