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15 Security
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he J2EE application programming model insulates developers from mechanism-specific implementation details of application security J2EE provides this insulation in a way that enhances the portability of applications, allowing them to be deployed in diverse security environments
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Some of the material in this chapter assumes that you have an understanding of basic security concepts To learn more about these concepts, we highly recommend that you explore the Security trail in the Java Tutorial (see ) before you begin this chapter
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Overview 334 Security Roles 335 Declaring and Linking Role References 335 Mapping Roles to J2EE Users and Groups 337 Web-Tier Security 337 Protecting Web Resources 337 Controlling Access to Web Resources 338 Authenticating Users of Web Resources 338 Using Programmatic Security in the Web Tier 340 Unprotected Web Resources 340 EJB-Tier Security 341 Declaring Method Permissions 341 Using Programmatic Security in the EJB Tier 341 Unprotected EJB-Tier Resources 342 333
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Application Client-Tier Security 342 Specifying the Application Client s Callback Handler 343 EIS-Tier Security 343 Configuring Sign-On 344 Container-Managed Sign-On 344 Component-Managed Sign-On 344 Configuring Resource Adapter Security 345 Propagating Security Identity 346 Configuring a Component s Propagated Security Identity 347 Configuring Client Authentication 347 J2EE Users, Realms, and Groups 348 Managing J2EE Users and Groups 349 Setting Up a Server Certificate 350
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Overview
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The J2EE platform defines declarative contracts between those who develop and assemble application components and those who configure applications in operational environments In the context of application security, application providers are required to declare the security requirements of their applications in such a way that these requirements can be satisfied during application configuration The declarative security mechanisms used in an application are expressed in a declarative syntax in a document called a deployment descriptor An application deployer then employs container-specific tools to map the application requirements that are in a deployment descriptor to security mechanisms that are implemented by J2EE containers The J2EE SDK provides this functionality with
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Programmatic security refers to security decisions that are made by securityaware applications Programmatic security is useful when declarative security alone is not sufficient to express the security model of an application For example, an application might make authorization decisions based on the time of day, the parameters of a call, or the internal state of an enterprise bean or Web component Another application might restrict access based on user information stored in a database J2EE applications are made up of components that can be deployed into different containers These components are used to build a multitier enterprise application The goal of the J2EE security architecture is to achieve end-to-end security by securing each tier
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SECURITY ROLES
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The tiers can contain both protected and unprotected resources Often, you need to protect resources to ensure that only authorized users have access Authorization provides controlled access to protected resources Authorization is based on identification and authentication Identification is a process that enables recognition of an entity by a system, and authentication is a process that verifies the identity of a user, device, or other entity in a computer system, usually as a prerequisite to allowing access to resources in a system Authorization is not required to access unprotected resources Because authorization is built upon authentication, authentication is also not needed to access unprotected resources Accessing a resource without authentication is referred to as unauthenticated or anonymous access
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Security Roles
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When you design an enterprise bean or Web component, you should always think about the kinds of users who will access the component For example, an enterprise bean might be accessed by customers, bank tellers, and branch managers Each of these user categories is called a security role, an abstract logical grouping of users that is defined by the person who assembles the application When an application is deployed, the deployer will map the roles to security identities in the operational environment A J2EE group also represents a category of users, but it has a different scope from a role A J2EE group is designated for the entire J2EE server, whereas a role covers only a specific application in a J2EE server To create a role for a J2EE application, you declare it for the EJB JAR file or for the WAR file that is contained in the application For example, you could use the following procedure to create a role in 1 Select the enterprise bean s EJB JAR file or the Web component s WAR file 2 In the Roles tabbed pane, click Add 3 In the table, enter values for the Name and Description fields
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