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The UpdatePanel control contains a designer surface where you can place HTML. This markup is the only one updated upon a postback if the ScriptManager control is enabled for partial updates. Consider Figure 5-7, where several text boxes and a button appear on the screen. This application has two text boxes, two labels, and a button outside the UpdatePanel control, and it has a label inside the UpdatePanel designer. The label on the inside is called lblResult. The code behind the button reads as follows:

Figure 15-3. A user accesses multiple applications but authenticates (or signs on) only once to the application server using the single sign-on feature. Security is undermined if the application stores the end user s password. For example, if the application code has the password, then it is trivial to extract the passwords in many cases (e.g., using the strings utility found in most UNIX operating system variants). Every time there is a change in a user s password in the database, all applications that access the username and password have to be modified as well, leading to maintenance problems.

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Performance and scalability are affected adversely if an application has to authenticate using the end user s database password. Consider an application that uses a connection pool of a maximum 100 connections for a system serving 5,000 end users. Every time a new user logs in, the likelihood of the user s connection not existing in the pool is high, simply because each user connects to a different account. This means that, more likely than not, an existing connection in the pool has to be closed and replaced with a newly created connection. This defeats the purpose of connection pooling to a large extent, especially when you use an implicit connection cache, where each session requires the creation of a physical connection. Some of the problems just mentioned would be mitigated if all application end users shared a smaller set of database user accounts based on their roles (i.e., an N-to-M mapping). However, this gives rise to new set of problems. One problem is that different application users have to share the same password for the shared database account, leading to poor security. Another problem, as mentioned earlier, is that the user actions cannot be audited effectively. What we really need is for the application to log into the database using a common database account on behalf of an end user without requiring it to present the end user s database password. In other words, the account midtier proxies for the end user. This is where proxy authentication (also known as n-tier authentication) comes in.

int x = Convert.ToInt16(txt1.Text); int y = Convert.ToInt16(txt2.Text); int z = x+y; lblResult.Text = z.ToString();

Proxy Authentication (N-Tier Authentication)

Proxy authentication is a feature available only in the JDBC OCI driver as of Oracle 10g Release 1.

Note In 10g Release 2, this feature is planned to be supported in the JDBC thin driver, too. The examples

As you can see, the label for the result gets updated to the value of the sum of the values of the text in the text boxes. Because lblResult is in the UpdatePanel control, and the ScriptManager control is set to enable partial rendering, clicking the button updates only the text within the UpdatePanel control. You will see and dissect more examples of this in 6.

in this book use an OCI driver on a 10g Release 1 database, but the basic concepts should remain the same with a thin driver.

Proxy authentication allows you to connect on behalf of another user without supplying the user s password (provided appropriate privileges have been granted to enable this). The way proxy authentication works is simple. You create an OCI connection pool consisting of connections of the proxy user account. Then you can create sessions on top of these physical connections for the individual database users (as demonstrated in the previous chapter). This solves the problem of password management simply by not requiring the proxied user s password. For example, assume that the proxy account is called midtier, and you want to create two sessions of db_clerk1 and one session of db_manager1 on top of a single physical connection from the pool of midtier connections. Figure 15-4 shows one such proxy connection carrying three of these sessions.

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