Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Security / WindowsAuthenticationModule.cs / 5 / WindowsAuthenticationModule.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* * WindowsAuthenticationModule class * * Copyright (c) 1999 Microsoft Corporation */ namespace System.Web.Security { using System.Web; using System.Web.Configuration; using System.Security.Principal; using System.Security.Permissions; using System.Globalization; using System.Web.Management; using System.Web.Util; using System.Web.Hosting; ////// [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] public sealed class WindowsAuthenticationModule : IHttpModule { private WindowsAuthenticationEventHandler _eventHandler; private static bool _fAuthChecked; private static bool _fAuthRequired; private static WindowsIdentity _anonymousIdentity; private static WindowsPrincipal _anonymousPrincipal; ////// Allows ASP.NET applications to use Windows/IIS authentication. /// ////// [SecurityPermission(SecurityAction.Demand, Unrestricted=true)] public WindowsAuthenticationModule() { } ////// Initializes a new instance of the ////// class. /// /// This is a global.asax event that must be /// named WindowsAuthenticate_OnAuthenticate event. It's used primarily to attach a /// custom IPrincipal object to the context. /// public event WindowsAuthenticationEventHandler Authenticate { add { _eventHandler += value; } remove { _eventHandler -= value; } } ////// public void Dispose() { } ///[To be supplied.] ////// public void Init(HttpApplication app) { app.AuthenticateRequest += new EventHandler(this.OnEnter); } //////////////////////////////////////////////////////////// // OnAuthenticate: Custom Authentication modules can override // this method to create a custom IPrincipal object from // a WindowsIdentity ///[To be supplied.] ////// Calls the /// WindowsAuthentication_OnAuthenticate handler if one exists. /// void OnAuthenticate(WindowsAuthenticationEventArgs e) { //////////////////////////////////////////////////////////// // If there are event handlers, invoke the handlers if (_eventHandler != null) _eventHandler(this, e); if (e.Context.User == null) { if (e.User != null) e.Context.User = e.User; else if (e.Identity == _anonymousIdentity) e.Context.SetPrincipalNoDemand(_anonymousPrincipal, false /*needToSetNativePrincipal*/); else e.Context.SetPrincipalNoDemand(new WindowsPrincipal(e.Identity), false /*needToSetNativePrincipal*/); } } //////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////// //////////////////////////////////////////////////////////// // Methods for internal implementation ////// /// void OnEnter(Object source, EventArgs eventArgs) { if (!IsEnabled) return; HttpApplication app = (HttpApplication)source; HttpContext context = app.Context;; WindowsIdentity identity = null; ////////////////////////////////////////////////////////////////// // Step 2: Create a Windows Identity from the credentials from IIS if (HttpRuntime.UseIntegratedPipeline) { // The native WindowsAuthenticationModule sets the user principal in IIS7WorkerRequest.SynchronizeVariables. // The managed WindowsAuthenticationModule provides backward compatibility by rasing the OnAuthenticate event. WindowsPrincipal user = context.User as WindowsPrincipal; if (user != null) { // identity will be null if this is not a WindowsIdentity identity = user.Identity as WindowsIdentity; // clear Context.User for backward compatibility (it will be set in OnAuthenticate) context.SetPrincipalNoDemand(null, false /*needToSetNativePrincipal*/); } } else { String strLogonUser = context.WorkerRequest.GetServerVariable("LOGON_USER"); String strAuthType = context.WorkerRequest.GetServerVariable("AUTH_TYPE"); if (strLogonUser == null) { strLogonUser = String.Empty; } if (strAuthType == null) { strAuthType = String.Empty; } if (strLogonUser.Length == 0 && (strAuthType.Length == 0 || StringUtil.EqualsIgnoreCase(strAuthType, "basic"))) { //////////////////////////////////////////////////////// // Step 2a: Use the anonymous identity identity = _anonymousIdentity; } else { identity = new WindowsIdentity( context.WorkerRequest.GetUserToken(), strAuthType, WindowsAccountType.Normal, true); } } /////////////////////////////////////////////////////////////////////////////////// // Step 3: Call OnAuthenticate to create IPrincipal for this request. if (identity != null) { OnAuthenticate( new WindowsAuthenticationEventArgs(identity, context) ); } } internal static IPrincipal AnonymousPrincipal { get { return _anonymousPrincipal; } } internal static bool IsEnabled { get { if (!_fAuthChecked) { AuthenticationSection settings = RuntimeConfig.GetAppConfig().Authentication; settings.ValidateAuthenticationMode(); _fAuthRequired = (settings.Mode == AuthenticationMode.Windows); if (_fAuthRequired) { _anonymousIdentity = WindowsIdentity.GetAnonymous(); _anonymousPrincipal = new WindowsPrincipal(_anonymousIdentity); } _fAuthChecked = true; } return _fAuthRequired; } } } }
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