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For example, looking at table 8.6, we can see that if a report calls external code in a custom assembly, code in this assembly will be assigned the Execution permission set by default. This is fine if this assembly is self-contained and doesn t access external resources that require a more restrictive set of permissions, for example, writing to files, opening database connections, and so on. If it does, then we need to adjust its code access policy accordingly. Understanding configuration files The default RS security policy is defined in policy configuration files. RS has three policy configuration files, one per each component, as shown in table 8.7.

The HttpContext class exposes several other interesting properties, such as TimeStamp (the initial DateTime value for the current HTTP request) and AllErrors (the arrays of errors accumulated while processing an HTTP request). Read the MSDN documentaZ tion for more information.

The next statement creates an SPSite object named spsColl that describes the site collection that contains the current site.

SPSite spsColl = SPControl.GetContextSite(Context);

The Global.asax file is the ASP.NET counterpart of Global.asa in ASP and is used to host the handlers of the Application object s events. As you ll see, however, the contents of this file are quite different in ASP.NET. For example, this is a simple Global.asax file (created in Visual Studio) that keeps a counter of how many client sessions are in memory:

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Once you have these objects, you can retrieve more information about the site or its collction by using their properties and methods. For example, after you create an SPWeb object named spwCurr as described above:

Table 8.7 Policy configuration files Configuration File rssrvpolicy.config rsmgrpolicy.config rspreviewpolicy.config Path C:\Program Files\Microsoft SQL Server\MSSQL\ Reporting Services\ReportServer C:\Program Files\Microsoft SQL Server\MSSQL\ Reporting Services\ReportManager C:\Program Files\Microsoft SQL Server\80\Tools\ Report Designer

Returns the current team member s login name,

Public Class Global Inherits System.Web.HttpApplication Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs) We start with zero sessions. Application( SessionCount ) = 0 End Sub

Returns the current team member s personal name,

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Why do we need to enforce code access security policy for the Report Designer As you would recall from our discussion in chapter 2, the Report Designer gives you the option to run the report in the Preview window. You can use the Preview window to simulate the Report Server environment by cloning its code access settings to the rspreviewpolicy.config configuration file. When you run the report (by pressing F5), the Report Host will read and apply these settings to sandbox the custom code that the report uses. The Preview window mode allows the author of the report to change the code access security policy locally, and once the custom code executes properly, to propagate the configuration changes to the Report Server policy file. Please note that previewing reports using the Report Designer s Preview tab bypasses the Report Designer s security policy and grants the FullTrust permission set to custom assemblies. Once again, to see the effect of the policy settings from the rspreviewpolicy.config configuration file, preview the report in the Preview window by running the report in Debug mode (F5). 8.2.3 Managing RS code access security The report administrator can easily adjust the code access security policies by making changes to the appropriate configuration files. For example, let s say our custom assembly, MyAssembly, requires the ability to read from the file C:\MyFile.xml. Because the default code access policy gives custom assemblies only Execution rights, when the assembly attempts to read from the file, it will fail.

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spwCurr.Name spwCurr.Lists spwCurr.Delete()

Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs) A new session is being created. Application.Lock Application( SessionCount ) = CInt(Application( SessionCount )) + 1 Application.Unlock End Sub Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs) A session is being destroyed. Application.Lock Application( SessionCount ) = CInt(Application( SessionCount )) - 1 Application.Unlock End Sub End Class

Gets or sets the name of the current site. Returns a collection of SPList objects, one for each list in the site. Deletes the current site.

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