2 // System.Web.Security.DefaultAuthenticationModule
5 // Gonzalo Paniagua Javier (gonzalo@ximian.com)
7 // (C) 2002 Ximian, Inc (http://www.ximian.com)
8 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
10 // Permission is hereby granted, free of charge, to any person obtaining
11 // a copy of this software and associated documentation files (the
12 // "Software"), to deal in the Software without restriction, including
13 // without limitation the rights to use, copy, modify, merge, publish,
14 // distribute, sublicense, and/or sell copies of the Software, and to
15 // permit persons to whom the Software is furnished to do so, subject to
16 // the following conditions:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30 using System.ComponentModel;
31 using System.Security.Permissions;
32 using System.Security.Principal;
33 using System.Threading;
35 // more info on the workings of this class can be found in Shackow, p. 55
37 namespace System.Web.Security
39 // CAS - no InheritanceDemand here as the class is sealed
40 [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
41 public sealed class DefaultAuthenticationModule : IHttpModule
43 static readonly object authenticateEvent = new object ();
44 static IPrincipal generic_principal = new GenericPrincipal (new GenericIdentity ("", ""), new string [0]);
46 EventHandlerList events = new EventHandlerList ();
48 public event DefaultAuthenticationEventHandler Authenticate {
49 add { events.AddHandler (authenticateEvent, value); }
50 remove { events.RemoveHandler (authenticateEvent, value); }
53 [SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
54 public DefaultAuthenticationModule ()
58 public void Dispose ()
62 public void Init (HttpApplication app)
64 app.DefaultAuthentication += new EventHandler (OnDefaultAuthentication);
67 void OnDefaultAuthentication (object sender, EventArgs args)
69 HttpApplication app = (HttpApplication) sender;
70 HttpContext context = app.Context;
72 DefaultAuthenticationEventHandler eh = events [authenticateEvent] as DefaultAuthenticationEventHandler;
73 if (context.User == null && eh != null)
74 eh (this, new DefaultAuthenticationEventArgs (context));
76 if (context.User == null)
77 context.User = generic_principal;
79 Thread.CurrentPrincipal = context.User;