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Listing 6.6 first injects the EJB context b. We use the isCallerInRole method of the EJBContext to see if the underlying authenticated principal has the CSR role C. If it does not, we throw a java.lang.SecurityException notifying the user about the authorization violation D. Otherwise, the bid cancellation method is allowed to proceed normally. We discuss both the security management related methods provided in the EJB context next, namely isCallerInRole and getCallerPrincipal. isCallerInRole and getCallerPrincipal Programmatic security is made up solely of the two previously mentioned security-related methods. The methods are defined in the javax.ejb.EJBContext interface as follows:

public interface EJBContext { ... public java.security.Principal getCallerPrincipal(); public boolean isCallerInRole(java.lang.String roleName); ... }

The code in the samples shown before follows some common naming conventions used for the definition of managed types. These naming conventions depend on type visibility. Type names for public as well as private types use the PascalCase naming convention: The first letter of the name as well as the first letter of each word within the name are uppercase letters, and the remaining letters are lowercase. For managed classes, you should not use the prefix C, as is typically done in MFC- and ATL-based code. Names for data members do not use type-specific prefixes (Hungarian notation). You should also avoid the prefix m_ for data members. Some coders use the underscore (_) prefix for private members, but it is not a common practice. Public members always use PascalCase, and private members typically use camelCase-based names. In camelCase names, the first letter is lowercase, the first letter of each word within the name is uppercase, and the remaining letters are lowercase. For local variables and parameter names, camelCase is used, too. In addition, there are some prefixes and suffixes for special cases. As an example, interfaces are named starting with a capital I, immediately followed by a PascalCase name; exception classes have the suffix Exception; and classes for custom attributes have the suffix Attribute.

You ve already seen the isCallerInRole method in action; it is fairly selfexplanatory. Behind the scenes, the EJB context retrieves the Principal associated with the current thread and checks if any of its roles match the name you provided. The getCallerPrincipal method gives you direct access to the java. security.Principal representing the current authentication context. The only

method of interest in the Principal interface is getName, which returns the name of the Principal. Most of the time, the name of the Principal is the login name of the validated user. This means that just as in the case of a homemade security framework, you could validate the individual user if you needed to. For example, let s assume that we had a change of heart and decided that in addition to the CSRs, bidders can cancel their own bids as long as the cancellation is done within a minute of putting in the bid. We could implement this using the getCallerPrincipal method as follows:

The point is that your preferred security tokens and your preferred hashing and encryption algorithms are simply a means to a bigger goal of establishing trusted communication, otherwise known in the Web services world as secure conversation. There is no single correct choice of technologies that you should always use. Instead, you need to be using those technologies that are appropriate for establishing a trusted, secure conversation between a given client and a Web service. The rules can change depending on who is doing the communicating. This chapter focuses on how you establish session-oriented, trusted communications using the WS-Secure Conversation specification. The great thing about the WS- specifications is that many of the concepts complement each other and build on each other. The understanding that you now have about WS-Security and WS-Policy will translate directly into the concepts behind WS-Secure Conversation. By the end of this chapter, you will have a good understanding of what constitutes secure conversation, and a broader appreciation for the usefulness of the WS-Security family of specifications.

public void cancelBid(Bid bid, Item item) { if (!context.isCallerInRole("CSR") && !(context.getCallerPrincipal().getName().equals( bid.getBidder().getUsername()) && (bid.getTimestamp() >= (getCurrentTime() - 60*1000))))) { throw new SecurityException( "No permissions to cancel bid"); } ... }