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I was initially tempted to implement the user-to-group membership assignment in GetUserInfo. My envisioned approach was to check the user s profile store and assign the user to one or multiple roles as you could do when using ASP.NET Forms Authentication, for example:
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// check the group membership and assign user to the Individual role HttpContext.Current.User = new GenericPrincipal (userIdentity, new string[] { "Invididual" });
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Then, my plan called for verifying the user group in CheckAccess by using the IPrincipal.IsInRole() method and authorizing the user based on the group membership. Unfortunately, while this approach will work, GetUserInfo is called repeatedly within a single request, and performing a database lookup each time may very well hinder the application s performance. For this reason, I abandoned my original plan in favor of performing the database lookup in the CheckAccess overloads, as suggested by a Microsoft engineer from the RS group.
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After several SetConfiguration and GetUserInfo calls, the Report Server eventually calls the LogonUser method to ask you to validate the user s credentials. The Report Server conveniently passes the username and password that were sent in the LogonUser web method call. This implementation of LogonUser performs a database lookup against the Individual table in an attempt to find a customer identifier that matches the username. If this is the case, you consider the user valid and set the method s return value to true. Note that the Report Server calls IAuthentication.LogonUser only once during the lifetime of the user s session as a result of the call to the LogonUser web method. As we ve noted earlier, if the user is authenticated successfully, the Report Server will issue a ticket in the form of a cookie that will be checked automatically with each request to determine if authentication has already taken place. The cookie s details are specified in the Report Server s web.config configuration file. Set the cookie to expire after one hour, as shown here:
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<authentication mode="Forms"> <forms loginUrl="logon.aspx" name="sqlAuthCookie" timeout="60" slidingExpiration="true" path="/"> </forms> </authentication>
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ASP.NET developers familiar with the ASP.NET Forms Authentication model will find
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this syntax familiar. For example, you can use the same declaration attributes to configure the RS custom authentication. You may wonder how the Report Server validates the username when the administrator creates a new role-based security policy using the Report Manager portal. When an attempt is made to change the role-based security policy of a given item in the report catalog, the Report Server calls IAuthenticationExtension. IsValidPrincipalName (not shown in the sequence diagram). The Report Server will pass only the username (not the password) and ask your authentication extension to verify that the username is valid. 492 EXTENDING REPORTING SERVICES
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You can view the call to IsValidPrincipalName as a safeguard against the possibility that some malicious code could try to exploit the RS role-based security policy to gain access to the report catalog. Interestingly, the Report Server calls IAuthenticationExtension.IsValidPrincipalName for each user or group assigned to the catalog item. If a match is not found, an exception is raised and the attempt to change the role-based security policy won t succeed. Implementing custom authorization Once authenticated, our custom authorization model needs to verify that the user has adequate rights to perform the attempted action. How involved this gets will depend on your security requirements. In the simplest case, you won t have to change the authorization code included in the Microsoft sample at all. Its authorization implementation checks to see whether the user has permissions to perform the requested action. If you don t need to support assigning users to groups, the sample authorization implementation will most likely suffice for your needs. Similarly to the authentication model, the authorization process starts when the Report Server calls IAuthorizationExtension.SetConfiguration to give your custom authorization extension a chance to configure itself using the setting in the configuration file. In our example, the configuration section includes only the administrator s name. This is needed because you want to bypass the authorization check if the user has admin rights. Depending on the type of attempted action, the Report Server will call different CheckAccess overloads. For example, if a report is requested, the Report Server will call the following overload:
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public bool CheckAccess(string userName, IntPtr userToken, byte[] secDesc, ReportOperation requiredOperation)
If the report includes images, the Report Server will also call the CheckAccess overload that takes ResourceOperation as the last argument:
// Overload for Report operations public bool CheckAccess( string userName, IntPtr userToken, byte[] secDesc, ReportOperation requiredOperation) { if (0 == String.Compare(userName, m_adminUserName, true, CultureInfo.CurrentCulture)) return true; Allows
unrestricted access for administrator IPrincipal user = HttpContext.Current.User; if (Util.IsNumeric(userName)) userName = "individual"; Assigns user to group
AceCollection acl = DeserializeAcl(secDesc); foreach(AceStruct ace in acl) { Determines user s access to resource if (0 == String.Compare(userName, ace.PrincipalName, true, CultureInfo.CurrentCulture) { ) foreach(ReportOperation aclOp in ace.ReportOperations) if (aclOp == requiredOperation) return true;
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