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Listing 9.8 Customization based on credentials
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'VB.Net Imports System.Security.Principal Private Sub AddConfirmDelete(ByVal sender As System.Object, _ ByVal e As DataListItemEventArgs) Dim lbl As Label
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Dim lb As LinkButton Dim JavaScript As String Dim p As IPrincipal = HttpContext.Current.User If e.Item.ItemType = ListItemType.AlternatingItem Then lbl = e.Item.FindControl("lblAltContactIDOut") lb = e.Item.FindControl("lbAltDelete") JavaScript = "javascript:return confirm('You are about to _ delete Contact ID # " & lbl.Text & ". Confirm ')" lb.Attributes("onClick") = JavaScript If Not p.IsInRole("Administrator") Or Not p.IsInRole("Manager") Then lb.Visible = False End If ElseIf e.Item.ItemType = ListItemType.Item Then lbl = e.Item.FindControl("lblContactIDOut") lb = e.Item.FindControl("lbDelete") JavaScript = "javascript:return confirm('You are about to _ delete Contact ID # " & lbl.Text & ". Confirm ')" lb.Attributes("onClick") = JavaScript If Not p.IsInRole("Administrator") Or Not p.IsInRole("Manager") Then lb.Visible = False End If End If End Sub //C# using System.Security.Principal; private void AddConfirmDelete(Object sender, DataListItemEventArgs e) { Label lbl; LinkButton lb; string JavaScript; IPrincipal p = HttpContext.Current.User; if(e.Item.ItemType == ListItemType.AlternatingItem) { lbl = (Label)e.Item.FindControl("lblAltContactIDOut"); lb = (LinkButton)e.Item.FindControl("lbAltDelete"); JavaScript = "javascript:return confirm('You are about to delete Contact ID # " + lbl.Text + ". Confirm ')"; lb.Attributes["onClick"] = JavaScript; if((! p.IsInRole("Administrator")) || (! p.IsInRole("Manager"))) { lb.Visible = false; } } else if(e.Item.ItemType == ListItemType.Item) { lbl = (Label)e.Item.FindControl("lblContactIDOut"); lb = (LinkButton)e.Item.FindControl("lbDelete"); JavaScript = "javascript:return confirm('You are
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about to delete Contact ID # " + lbl.Text + ". Confirm ')"; lb.Attributes["onClick"] = JavaScript; if((! p.IsInRole("Administrator")) || (! p.IsInRole("Manager"))) { lb.Visible = false; } } }
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Listing 9.8 expands our AddConfirmDelete command. The first addition is that we are creating an IPrincipal object, which is saved for our user in the HttpContext.Current.User property. The user s principal can be determined by executing the IsInRole method and passing in a role to be evaluated. In our case, if the user is not in the role of Administrator or Manager, then the Delete LinkButton s Visible property on our form is set to False. This essentially hides that functionality from users that aren t Administrators or Managers. Though this is a simple example, you can easily expand on it in your applications. You can also use a principal to restrict access to specific classes, pages, or methods. This can be done by using the PrincipalPermissionAttribute, as shown in listing 9.9.
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Listing 9.9 Using PrincipalPermissionAttribute
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<PrincipalPermission(SecurityAction.Demand, Role:="Managers")> _ Public Class salaryReport Inherits System.Web.UI.Page '... End Class [PrincipalPermission(SecurityAction.Demand, Role="Managers")] public class SalaryReport : System.Web.UI.Page { //... }
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As you can see in listing 9.9, the PrincipalPermissionAttribute has been applied at the class level. When a user requests the salaryReport.aspx page, the CLR attempts to create an instance of the salaryReport class. Before the object instance is created, the CLR demands the principal of the user. If the user is in the Managers role, then the object instance is created and the page is displayed. If the user is not in this role, then because we are requesting a web page, IIS returns a 401 error to the user.
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Again, the PrincipalPermissionAttribute can be applied at the method level; however, administration of possibly hundreds of methods could become a nightmare. If you are going to use this method for security, you should evaluate which methods have to be accessed by which users. This type of security is useful and can be easily related to assigning NTFS permissions. In theory, you could create a single directory on a file server and assign permissions to individual files in that directory. The more files that are stored in the directory, the more difficult it is to administer security. The same is true with demanding principal from classes versus methods. You should create separate classes based on user access and assign permissions at the class level. Granted, there are some instances where you will find a reason to authenticate users at the method level, but these cases will be rare. 9.2.3 Passport authentication Passport authentication is built into Windows Server 2003 and IIS 6. It defines a Secure Sign-in Interface (SSI) for your applications that allows you to authenticate users based on a web service provided by Microsoft over the Internet. SSI is every bit as secure as using any SSL-based login on the Internet. In fact, behind the scenes, Passport uses SSI to transport user information from client to server for validation, and then if the user is authenticated, from server to client with the validated authentication cookie. In versions previous to Windows Server 2003, if you wanted to create a Passportenabled site, you were required to download and install the Passport SDK on the web server in which your site would reside. Additionally, you had to write quite a lot of code in order to communicate with Passport, which has very strict guidelines as to how and
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