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//------------------------------------------------------------------------------
// <copyright file="BackStopAuthenticationModule.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.Security {
using System.Collections.Specialized;
using System.Runtime.Serialization;
using System.Security.Principal;
using System.Security.Permissions;
using System.Threading;
using System.Web;
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public sealed class DefaultAuthenticationModule : IHttpModule {
private DefaultAuthenticationEventHandler _eventHandler;
/// <devdoc>
/// <para>
/// Initializes a new instance of the <see cref='System.Web.Security.DefaultAuthenticationModule'/>
/// class.
/// </para>
/// </devdoc>
[SecurityPermission(SecurityAction.Demand, Unrestricted=true)]
public DefaultAuthenticationModule() {
}
[SecurityPermission(SecurityAction.Assert, Unrestricted = true)]
internal static DefaultAuthenticationModule CreateDefaultAuthenticationModuleWithAssert() {
return new DefaultAuthenticationModule();
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public event DefaultAuthenticationEventHandler Authenticate {
add {
// WOS 1709222: DefaultAuthentication_Authenticate is not supported in integrated mode.
if (HttpRuntime.UseIntegratedPipeline) {
throw new PlatformNotSupportedException(SR.GetString(SR.Method_Not_Supported_By_Iis_Integrated_Mode, "DefaultAuthentication.Authenticate"));
}
_eventHandler += value;
}
remove {
_eventHandler -= value;
}
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public void Dispose() {
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public void Init(HttpApplication app) {
// adding this module back to IIS7
// it needs to run between Windows auth in PostAuthn
// and RoleManager (or anyone else who needs the principal)
// so ordering is important
// If the subscribed event changes, WindowsAuthenticationModule
// needs work, too.
if (HttpRuntime.UseIntegratedPipeline) {
app.PostAuthenticateRequest += new EventHandler(this.OnEnter);
}
else {
app.DefaultAuthentication += new EventHandler(this.OnEnter);
}
}
////////////////////////////////////////////////////////////
// OnAuthenticate: Custom Authentication modules can override
// this method to create a custom IPrincipal object from
// a DefaultIdentity
void OnAuthenticate(DefaultAuthenticationEventArgs e) {
////////////////////////////////////////////////////////////
// If there are event handlers, invoke the handlers
if (_eventHandler != null) {
_eventHandler(this, e);
}
}
////////////////////////////////////////////////////////////
// AddOnAuthenticate and RemoveOnAuthenticate: Use these
// methods to hook up event handlers to handle the
// OnAuthenticate Event
[SecurityPermission(SecurityAction.Assert, ControlPrincipal = true)]
void OnEnter(Object source, EventArgs eventArgs) {
HttpApplication app;
HttpContext context;
app = (HttpApplication)source;
context = app.Context;
////////////////////////////////////////////////////////////
// Step 1: Check if authentication failed
if (context.Response.StatusCode > 200) { // Invalid credentials
if (context.Response.StatusCode == 401)
WriteErrorMessage(context);
app.CompleteRequest();
return;
}
////////////////////////////////////////////////////////////
// Step 2: If no auth module has created an IPrincipal, then fire
// OnAuthentication event
if (context.User == null) {
OnAuthenticate (new DefaultAuthenticationEventArgs(context) );
if (context.Response.StatusCode > 200) { // Invalid credentials
if (context.Response.StatusCode == 401)
WriteErrorMessage(context);
app.CompleteRequest();
return;
}
}
////////////////////////////////////////////////////////////
// Step 3: Attach an anonymous user to this request, if none
// of the authentication modules created a user
if (context.User == null) {
context.SetPrincipalNoDemand(new GenericPrincipal(new GenericIdentity(String.Empty, String.Empty), new String[0]), false /*needToSetNativePrincipal*/);
}
Thread.CurrentPrincipal = context.User;
}
/////////////////////////////////////////////////////////////////////////////
void WriteErrorMessage(HttpContext context) {
context.Response.Write(AuthFailedErrorFormatter.GetErrorText());
// In Integrated pipeline, ask for handler headers to be generated. This would be unnecessary
// if we just threw an access denied exception, and used the standard error mechanism
context.Response.GenerateResponseHeadersForHandler();
}
}
//////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////
internal class AuthFailedErrorFormatter : ErrorFormatter {
private static string _strErrorText;
private static object _syncObject = new object();
internal AuthFailedErrorFormatter() {
}
internal /*public*/ static string GetErrorText() {
if (_strErrorText != null)
return _strErrorText;
lock(_syncObject) {
if (_strErrorText == null)
_strErrorText = (new AuthFailedErrorFormatter()).GetErrorMessage();
}
return _strErrorText;
}
protected override string ErrorTitle {
get { return SR.GetString(SR.Assess_Denied_Title);}
}
protected override string Description {
get {
return SR.GetString(SR.Assess_Denied_Description1);
//"An error occurred while accessing the resources required to serve this request. This typically happens when you provide the wrong user-name and/or password.";
}
}
protected override string MiscSectionTitle {
get { return SR.GetString(SR.Assess_Denied_MiscTitle1);}
//"Error message 401.1";}
}
protected override string MiscSectionContent {
get {
string miscContent = SR.GetString(SR.Assess_Denied_MiscContent1);
AdaptiveMiscContent.Add(miscContent);
return miscContent;
//return "Logon credentials provided were not recognized. Make sure you are providing the correct user-name and password. Otherwise, ask the web server's administrator for help.";
}
}
protected override string ColoredSquareTitle {
get { return null;}
}
protected override string ColoredSquareContent {
get { return null;}
}
protected override bool ShowSourceFileInfo {
get { return false;}
}
}
}
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