The Java SASL API defines classes and interfaces for SASL mechanisms.


The Java SASL API defines classes and interfaces for SASL mechanisms. It is used by developers to add authentication support for connection-based protocols that use SASL.

SASL Overview

Simple Authentication and Security Layer (SASL) specifies a challenge-response protocol in which data is exchanged between the client and the server for the purposes of authentication and (optional) establishment of a security layer on which to carry on subsequent communications. It is used with connection-based protocols such as LDAPv3 or IMAPv4. SASL is described in RFC 2222.

There are various mechanisms defined for SASL. Each mechanism defines the data that must be exchanged between the client and server in order for the authentication to succeed. This data exchange required for a particular mechanism is referred to to as its protocol profile. The following mechanims have been defined:

Some of these mechanisms provide both authentication and establishment of a security layer, others only authentication. Anonymous and S/Key do not provide for any security layers. GSSAPI and DIGEST-MD5 allow negotiation of the security layer. For External, the security layer is determined by the external protocol.


Users of this API are typically developers who produce client library implementations for connection-based protocols, such as LDAPv3 and IMAPv4, and developers who write servers (such as LDAP servers and IMAP servers). Developers who write client libraries use the SaslClient and SaslClientFactory interfaces. Developers who write servers use the SaslServer and SaslServerFactory interfaces.

Among these two groups of users, each can be further divided into two groups: those who produce the SASL mechanisms and those who use the SASL mechanisms. The producers of SASL mechanisms need to provide implementations for these interfaces, while users of the SASL mechanisms use the APIs in this package to access those implementations.

Related Documentation

Internet documents: