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10: Security
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Note that if another method were to use the same name (that is, overloaded methods were in the bean code), this permission scope would refer to both methods. You can refine the scope further by identifying methods with overloaded names by parameter signature, or you can refer to methods of a specific interface of the enterprise bean (such as remote, local). You can also indicate to the container that it should allow the call to a method to proceed regardless of the caller s identity. By adding the unchecked element to the method-permission element, the container authorizes the use of a method to anybody. Here is a deployment descriptor excerpt showing the unchecked element:
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<assembly-descriptor> ... <method-permission> <unchecked/> <method> <ejb-name>DeclarativeSecurity</ejb-name> <method-name>method1</method-name> </method> </method-permission> ... </assembly-descriptor>
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Additionally, method specifications may be added to an exclude-list. This indicates to the container that access to these methods is denied regardless of the caller s identity, even if the methods have been specified in the method-permission element. Here is a deployment descriptor excerpt showing the exclude-list element:
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<assembly-descriptor> ... <exclude-list> <method> <ejb-name>DeclarativeSecurity</ejb-name> <method-name>method4</method-name> </method> </exclude-list> ... </assembly-descriptor>
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There may be a time when declarative authorization is not sufficient. For example, if a more fine-grained authorization model is required, the developer of a web component can use a combination of the getUserPrincipal() and isUserInRole()
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Identify Locations for Implementation of Security Features
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methods that exist on the HttpServletRequest object, and the developer of an EJB component can use a combination of the getCallerPrincipal() and isCallerInRole() methods that exist on the EJBs context object, to carry out access control at the component level. This is known as programmatic authorization. The web or EJB component can use these methods to determine whether the caller is allowed to perform the functionality that has been called within the component.
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As mentioned, the web component developer will use getUserPrincipal() and isUserInRole() methods within a JSP or servlet to control access to the web resource s functionality. These methods typically require that the client also be authenticated, so it makes sense to use the technique in conjunction with declarative authorization. The following example shows the use of the programmatic authorization methods getUserPrincipal() and isUserInRole() in a JSP. The JSP is part of an application that also has some resources protected with declarative authorization. Here is example code for a JSP:
<html> <head><title>Security Demo</title></head> <body bgcolor="#FFFFFF"> <head><title>Security Demo: programmatically protected page</title></head> <h2>Programmatically Protected Page</h2> <hr width="100%"> <% java.security.Principal principal = request.getUserPrincipal(); if (principal != null) { boolean inRole = request.isUserInRole("secure_role"); if (inRole) { if ("system".equals(principal.getName())) { out.write("<br>You are the correct user ("+principal.getName() +") and role, so access is granted!"); // This is where code for the protected // functionality would reside... } else { out.write("<br>You are NOT the correct user ("+principal.getName() +"), so access is denied!"); } } else { out.write("<br>You are NOT in the correct role, so access is denied!"); }
10: Security
} else { out.write("<p>You are not authenticated, so access is denied!"); } %> <p><a href="../index.html">home</a> </body> </html>
To control access programmatically to an enterprise bean resource, the enterprise bean provider uses the isCallerInRole() and getCallerPrincipal() methods to determine whether the caller is within the specified role or is, in fact, a specific user that is authorized to perform the called functionality. Within the EJB deployment descriptor, the assembler must add a security-role-ref element for every role that is referred to within the bean code. The assembler must also add a securityrole element for the role-link in every security-role-ref element that has been added. Here is an excerpt for an EJB deployment descriptor:
<ejb-jar> ... <enterprise-beans> ... <ejb-name>ProgrammaticSecurity</ejb-name> ... <security-role-ref> <role-name>programmatic</role-name> <role-link>programmatic_role</role-link> </security-role-ref> ... </enterprise-beans> ... <assembly-descriptor> <security-role> <role-name>programmatic_role</role-name> </security-role> ... </assembly-descriptor> ... </ejb-jar>
When deployed, each role-name specified in the assembly-descriptor element of the EJB deployment descriptor must be mapped to actual resources in the target server. The following excerpt is from a WebLogic server deployment descriptor that resolves the role-name to specific resources within the server:
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