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Four modes are supported in the invocation of the method getProxyConnection(): We need to provide only the username of the proxied account (db_manager1, clerk1). We need to provide the username and password of the proxied account (db_manager1, clerk1). We need to provide the end user s distinguished name. We need to provide the end user s X.509 certificate. Let s look at each of these options briefly. Proxy by Username Only You ve already seen how this works in the class DemoProxyConnection. The main benefit is the fact that you don t need to know the end user s password. Note that the proxy user should itself be set up with minimal privileges (only create session as granted in our setup) for the application to work securely. Proxy by Username and Password In this case, you require the username and password of the end user while proxying for it. This is identical to normal authentication and has all the drawbacks of supplying passwords, as discussed earlier. One advantage this mode has over normal authentication is that by using the proxy authentication, it is possible to restrict the set of roles that can be enabled, as demonstrated earlier. This mode should be considered only if there is a way to obtain the end user s password securely. To require a password while proxying, we have to issue a slightly different alter statement when enabling proxying for an account: admin@ORA10G> alter user db_manager1 grant connect through midtier with role manager_role, clerk_role authenticated using password; User altered. If we now try to run our program DemoProxyConnection to connect as db_manager1, we get an exception: B:\>java DemoProxyConnection manager1 Exception in thread "main" java.sql.SQLException: ORA-28183: proper authentication not provided by proxy at trimmed to save space

To supply the end user s password, we need to populate another property, OracleOCI ConnectionPool.PROXY_PASSWORD, with the end user account s password: endUserProps.setProperty( OracleOCIConnectionPool.PROXY_PASSWORD, endUserPassword );

Another server control that ASP.NET AJAX provides is the UpdateProgress control. This indicates the progress of an asynchronous operation that is taking place. Typically, the browser s status bar serves as an indicator of activity. With the partial-rendering and asynchronous postback model in AJAX applications, viewing the status bar of the browser is no longer applicable, which is why the UpdateProgress control is ideal and more user friendly for displaying activity indicators on a web page.

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Proxy by Distinguished Name A distinguished name is an equivalent of the primary key in the LDAP world. LDAP stands for Lightweight Directory Access Protocol. This proxy authentication mode is used by applications using a central LDAP directory as their authentication mechanism. I don t cover this option in this book; please see the section Oracle Internet Directory in 9 of Oracle Security Overview (10g Release 1) for more details. Proxy by Certificate In this mode, you proxy using the X.509 certificate. This option is also not covered in this book. For more details on this topic, refer to 4 of Oracle Database Security Guide (10g Release 1).

Summary

You can have a single UpdateProgress control on your page for multiple UpdatePanels or have multiple UpdateProgress controls with different UIs for the UpdatePanels if you want to have different progress indicators for different sections of the page. By default, if you don t set the AssociatedUpdatePanelID property of the UpdateProgress control, it will be triggered by events in all UpdatePanels on the page (assuming there is more than one). To use an UpdateProgress control, you drag and drop it onto your page to create an <asp:UpdateProgress> tag on your page:

In this chapter, you learned about the security principles of least privilege and defense in depth. You looked at various ways of mapping an application end user to a database user for authentication purposes and each method s pros and cons. You examined proxy authentication (a JDBC OCI driver feature as of Oracle 10g Release 1 also known as n-tier authentication) in detail, and you learned how this technique can elegantly solve the problems of authentication and password management for a web application. The proxy authentication feature allows the middle tier to authenticate itself to the database on behalf of an end user database account without supplying the end user database account s password. You also learned how auditing captures the end user identity as well as the proxy user identity.

n this chapter, we ll look at some issues related to locking in Oracle. In particular, we ll discuss the infamous lost update problem and various ways to address it. Along the way, we ll examine different strategies to implement two solutions to the lost update problem namely, optimistic locking and pessimistic locking. We ll also compare these two solutions and determine when to use each strategy.

A lock is a mechanism Oracle uses to prevent destructive interaction between transactions accessing the same resource. Here, the resource could be user objects, such as tables; or user data, such as table rows; or internal objects, such as shared data structures in memory. A detailed discussion of locking and concurrency concepts in Oracle is beyond the scope of this book. For that, I refer you to 13 of Oracle Database Concepts Guide (10g Release 1) and 3 of Tom Kyte s Expert One-on-One Oracle (Apress, ISBN: 1-59059-243-3). In this chapter, I will define what lost updates are and how to deal with them when programming in Oracle. Throughout the chapter, unless otherwise stated explicitly, assume a default transaction isolation level of READ COMMITTED (see 4 for a discussion of transaction isolation levels).

The actual markup to display when the call is taking place is then defined using the <ProgressTemplate> tag.

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