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//
// System.Web.Security.FormsAuthenticationModule
//
// Authors:
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// (C) 2002 Ximian, Inc (http://www.ximian.com)
// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Security.Permissions;
using System.Security.Principal;
using System.Text;
using System.Web.Configuration;
using System.Web.Util;
namespace System.Web.Security
{
// CAS - no InheritanceDemand here as the class is sealed
[AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class FormsAuthenticationModule : IHttpModule
{
[SecurityPermission (SecurityAction.Demand, UnmanagedCode = true)]
public FormsAuthenticationModule ()
{
}
public void Dispose ()
{
}
public void Init (HttpApplication app)
{
app.AuthenticateRequest += new EventHandler (OnAuthenticateRequest);
app.EndRequest += new EventHandler (OnEndRequest);
}
void OnAuthenticateRequest (object sender, EventArgs args)
{
HttpApplication app = (HttpApplication) sender;
HttpContext context = app.Context;
string cookieName;
string cookiePath;
string loginPage;
bool slidingExpiration;
#if CONFIGURATION_2_0
AuthenticationSection config = (AuthenticationSection) WebConfigurationManager.GetWebApplicationSection ("system.web/authentication");
#else
AuthConfig config = (AuthConfig) context.GetConfig ("system.web/authentication");
#endif
if (config == null || config.Mode != AuthenticationMode.Forms) {
return;
}
#if CONFIGURATION_2_0
cookieName = config.Forms.Name;
cookiePath = config.Forms.Path;
loginPage = config.Forms.LoginUrl;
slidingExpiration = config.Forms.SlidingExpiration;
#else
cookieName = config.CookieName;
cookiePath = config.CookiePath;
loginPage = config.LoginUrl;
slidingExpiration = config.SlidingExpiration;
#endif
string reqPath = "";
string loginPath = null;
try {
reqPath = context.Request.PhysicalPath;
loginPath = context.Request.MapPath (loginPage);
} catch {} // ignore
context.SkipAuthorization = (reqPath == loginPath);
FormsAuthenticationEventArgs formArgs = new FormsAuthenticationEventArgs (context);
if (Authenticate != null)
Authenticate (this, formArgs);
bool contextUserNull = (context.User == null);
if (formArgs.User != null || !contextUserNull) {
if (contextUserNull)
context.User = formArgs.User;
return;
}
HttpCookie cookie = context.Request.Cookies [cookieName];
if (cookie == null || (cookie.Expires != DateTime.MinValue && cookie.Expires < DateTime.Now))
return;
FormsAuthenticationTicket ticket = FormsAuthentication.Decrypt (cookie.Value);
if (ticket == null || (ticket.IsPersistent && ticket.Expired))
return;
FormsAuthenticationTicket oldticket = ticket;
if (slidingExpiration)
ticket = FormsAuthentication.RenewTicketIfOld (ticket);
context.User = new GenericPrincipal (new FormsIdentity (ticket), new string [0]);
if (cookie.Expires == DateTime.MinValue && oldticket == ticket)
return;
cookie.Value = FormsAuthentication.Encrypt (ticket);
cookie.Path = cookiePath;
if (ticket.IsPersistent)
cookie.Expires = ticket.Expiration;
context.Response.Cookies.Add (cookie);
}
void OnEndRequest (object sender, EventArgs args)
{
HttpApplication app = (HttpApplication) sender;
HttpContext context = app.Context;
if (context.Response.StatusCode != 401 || context.Request.QueryString ["ReturnUrl"] != null)
return;
string loginPage;
#if CONFIGURATION_2_0
AuthenticationSection config = (AuthenticationSection) WebConfigurationManager.GetWebApplicationSection ("system.web/authentication");
loginPage = config.Forms.LoginUrl;
#else
AuthConfig config = (AuthConfig) context.GetConfig ("system.web/authentication");
loginPage = config.LoginUrl;
#endif
if (config == null || config.Mode != AuthenticationMode.Forms)
return;
StringBuilder login = new StringBuilder ();
login.Append (UrlUtils.Combine (context.Request.ApplicationPath, loginPage));
login.AppendFormat ("?ReturnUrl={0}", HttpUtility.UrlEncode (context.Request.RawUrl));
context.Response.Redirect (login.ToString ());
}
public event FormsAuthenticationEventHandler Authenticate;
}
}
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