How does IPrincipal gets its roles?

I need to get know how SiteMapProvider.IsAccessibleToUser() works.

Built-in XmlSiteMapProvider calls HttpContext.User.IsInRole() which uses System.Security.Principal.GenericPrincipal in case of forms authentication.

Where does the current user gets its roles? Which provider 开发者_如何学Pythonloads this kind of information? I want to overload it and use custom logic.

You do this by implementing a RoleProvider. Check out these links:

http://msdn.microsoft.com/en-us/library/8fw7xh74.aspx

http://www.codeproject.com/KB/aspnet/WSSecurityProvider.aspx

To use custom logic, you can create your own forms authentication cookie with roles and read it back in Global.asax.

See these:

private void SetAuthenticationCookie(int employeeID, List<string> roles)

protected void Application_AuthenticateRequest(Object sender, EventArgs e)

http://weblogs.asp.net/rajbk/archive/2010/04/01/securing-an-asp-net-mvc-2-application.aspx