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else throw new NotAdminException(); }
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This example allows clients within the role ADMIN to perform the important function. Clients in other roles will cause a NotAdminException to be thrown if they try to invoke the method.
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2.9 Specifying security roles in the bean source 7.1 Finding the identity and role of the caller inside an EJB method 7.3 Passing client credentials to the EJB container 7.4 Disabling methods for certain users
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7.3 Passing client credentials to the EJB container
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You want your clients to pass along their security credentials to the EJB container when looking up or invoking an EJB.
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Working within your application server, you have mapped certain users into specific logical roles. In addition, you have set up the security roles (see recipe 7.2) in the deployment descriptors for your EJB s. However, EJB clients must pass their security credentials to the EJB container in order for EJBs to acquire the user information.
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Recipe
To pass the client s credentials to the EJB container, create the JNDI InitialContext object using a set of properties that defines the client s credentials (listing 7.1).
Listing 7.1 Sample code initializing the InitialContext object with security credentials
Hashtable env = new Hashtable(); //add env.put( env.put( env.put( security principal information into context environment Context.SECURITY_AUTHENTICATION, "simple" ); Context.SECURITY_PRINCIPAL, "my_username" ); Context.SECURITY_CREDENTIALS, "my_password" );
Disabling methods for certain users
//Optionally set any properties needed by your app server vendor /* env.put( "", "" ); */ Context ctx = new InitialContext( env ); //Look up a particular EJB home interface SampleBeanHome home = ( SampleBeanHome ) ctx.lookup( "ejb/SampleBean" );
The final step for this recipe resides in the documentation of your application server. You need to assign users to particular roles in the server (which are then mapped to logical roles in the bean s deployment XML).
Discussion
The code in the recipe sets the username, password, and authentication mechanism for the client application. This information is passed to the container when the client attempts to look up or use a bean. The credentials are compared to a specific bean s security requirements to determine whether the client has enough privileges to use the bean. Additionally, beans can programmatically retrieve this information for use in method implementations to make flow decisions.
See also
7.1 Finding the identity and role of the caller inside an EJB method 1, Client code
7.4 Disabling methods for certain users
Problem
You want to prevent certain clients from invoking certain EJB methods.
Background
While you want to allow an EJB client to find and use a particular EJB, you want to expose only a limited set of methods to that client. Your goal is to hide a set of business methods, and possibly even particular home interface methods. For example, certain methods need to be available only to users in the Administrator role. Perhaps methods that make security changes, or critical data changes, should be hidden from normal users. EJBs use method permissions to further guarantee that the correct users are accessing methods.
Security
Recipe
To disable methods for users, you need to create a security role and configure the method access in the EJB deployment descriptor. Create security roles for your EJBs (see recipe 7.2 for more on this topic). Then, use the <method-permission> tag to set up method permissions for those roles. Assume an EmployeeBean contains getters and setters for the attributes firstName and lastName. The EmployeeBean has declared two roles, ADMIN and READ_ONLY, in its deployment descriptor. The code in listing 7.2 grants those with the ADMIN role access to all methods within an EJB.
Listing 7.2 Deployment descriptor
<ejb-jar> <enterprise-beans> <!-- Bean data here --> </enterprise-beans> <assembly-descriptor > <method-permission> <role-name> ADMIN </role-name> <method> <ejb-name>EmployeeBean</ejb-name> <method-name>*</method-name> </method> </method-permission> </assembly-descriptor> </ejb-jar>
To map the READ_ONLY role to the correct method permissions (only allowing use of the getter methods), use the following:
<method-permission> <role-name> READ_ONLY </role-name> <method> <ejb-name>EmployeeBean</ejb-name> <method-name>getFirstName</method-name> </method> <method> <ejb-name>EmployeeBean</ejb-name> <method-name>getLastName</method-name> </method> </method-permission>
Disabling methods for certain users
To disable all security checks for all clients of an EJB for a particular method, use the <unchecked/> tag:
<method-permission> <unchecked/> <method> <ejb-name>EmployeeBean</ejb-name> <method-name>*</method-name> </method> </method-permission>
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