Cover Page by Gary Cornell, Cay S. Horstmann

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9.4. User Authentication

The Java Authentication and Authorization Service (JAAS) has two components. The “authentication” part is concerned with ascertaining the identity of a program user. The “authorization” part maps users to permissions.

JAAS is a “pluggable” API that isolates Java applications from the particular technology used to implement authentication. It supports, among others, UNIX logins, NT logins, Kerberos authentication, and certificate-based authentication.

Once a user has been authenticated, you can attach a set of permissions. For example, here we grant Harry a particular set of permissions that other users do not have:

grant principal com.sun.security.auth.UnixPrincipal "harry" {    permission ...

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