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In traditional ASP programming developers often had to create their own security systems. A common approach was to insert a little snippet of code at the beginning of every secure page. This code would check for the existence of a custom cookie. If the cookie didn t exist, the user would be redirected to a login page, where the cookie would be created after a successful login. ASP.NET uses the same approach in its forms authentication model. You are still responsible for creating the login page (although you can use a set of specially designed controls to help you, as described in 21). However, you don t need to create the security cookie manually, or check for it in secure pages, because ASP.NET handles these tasks automatically. You also benefit from ASP.NET s support for sophisticated validation algorithms, which make it all but impossible for users to spoof their own cookies or try other hacking tricks to fool your application into giving them access. Figure 20-3 shows a simplified security diagram of the forms authentication model in ASP.NET. To implement forms-based security, you need to follow three steps: 1. Set the authentication mode to forms authentication in the web.config file (or use the WAT). 2. Restrict anonymous users from a specific page or directory in your application. 3. Create the login page. You ll walk through these steps in the following sections.

You specify the following as part of the SELECT statement:

You define the type of security in the web.config file by using the <authentication> tag. The following example configures the application to use forms authentication by using the <authentication> tag. It also sets several of the most important settings using a nested <forms> tag. Namely, it sets the name of the security cookie, the length of time it will be considered valid (in minutes), and the page that allows the user to log in.

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OPMN is in fact a multithreaded process that provides two distinct functions One thread, the process management thread, starts and stops Oracle Application Server components In the Oracle Application Server environment, it is only very rarely that you start a component directly; in virtually all circumstances, you issue an instruction to OPMN, and then it is the process management thread that actually starts (or stops) the component The notification thread monitors all OPMN-controlled components and coordinates messages between them This enables Oracle Application Server s fault tolerance If a component such as the Apache web listener or an OC4J instance fails, the notification service will detect this and send an instruction to the process management service to restart it OPMN itself has a fault tolerant structure; there are always two OPMN processes running, one shadowing the other If either OPMN process fails, the surviving process will restart it.

<configuration> <system.web> ... <authentication mode="Forms"> <forms name="MyAppCookie" loginUrl="~/Login.aspx" protection="All" timeout="30" path="/" /> </authentication> </system.web> ... </configuration> Table 20-1 describes these settings. They all supply default values, so you don t need to set them explicitly. For a complete list of supported attributes, consult the Visual Studio Help.

Row_Number() over (Partition by TerritoryID order by CustomerID) as [RowCount]

The name of the HTTP cookie to use for authentication (defaults to .ASPXAUTH). If multiple applications are running on the same web server, you should give each application s security cookie a unique name. Your custom login page, where the user is redirected if no valid authentication cookie is found. The default value is Login.aspx. The type of encryption and validation used for the security cookie (can be All, None, Encryption, or Validation). Validation ensures the cookie isn t changed during transit, and encryption (typically Triple-DES) is used to encode its contents. The default value is All. The number of minutes before the cookie expires. ASP.NET will refresh the cookie when it receives a request, as long as half of the cookie s lifetime has expired. The default value is 30. The path for cookies issued by the application. The default value (/) is recommended, because case mismatches can prevent the cookie from being sent with a request.

Every instance has its own OPMN; you cannot control one instance, started from one Oracle home, with the OPMN from another That said, all the OPMN processes in one farm do communicate with each other This is particularly important for clustering When Apache and OC4J components are clustered, a whole additional level of fault tolerance and load balancing becomes possible If an end user contacts the Apache listener of one clustered instance with a request to run some Java in an OC4J, the Apache can, through OPMN, identify which OC4J instances in the whole farm can best service the request Furthermore, if one OC4J fails, sessions can be reinstantiated against a surviving OC4J elsewhere All this, with the fault tolerance, is enabled by the OPMN services To start the OPMN, use the opmnctl utility, $ORACLE_HOME/opmn/bin/opmnctl on UNIX, and %ORACLE_HOME%\opmn\bin\opmnctlexe on Windows The utility is very simple to use.

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