This is the cyrus sasl api implementation, version 2.1.

sasl is the simple authentication and security layer, a method for adding authentication support to connection-based protocols. to use sasl, a protocol includes a command for identifying and authenticating a user to a server and for optionally negotiating protection of subsequent protocol interactions. if its use is negotiated, a security layer is inserted between the protocol and the connection. see rfc 2222 for more information.

any of: anonymous, cram-md5, digest-md5, gssapi (mit or heimdal kerberos 5), ntlm, otp, plain, or login can be used.