BackStopAuthenticationModule.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Security / BackStopAuthenticationModule.cs / 4 / BackStopAuthenticationModule.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

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;
 

    ///  
    ///    [To be supplied.] 
    /// 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public sealed class DefaultAuthenticationModule : IHttpModule {
        private DefaultAuthenticationEventHandler _eventHandler;

 
        /// 
        ///     
        ///       Initializes a new instance of the  
        ///       class.
        ///      
        /// 
        [SecurityPermission(SecurityAction.Demand, Unrestricted=true)]
        public DefaultAuthenticationModule() {
        } 

 
        ///  
        ///    [To be supplied.]
        ///  
        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;
            }
        }
 

        ///  
        ///    [To be supplied.] 
        /// 
        public void Dispose() { 
        }


        ///  
        ///    [To be supplied.]
        ///  
        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
        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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BackStopAuthenticationModule.cs source code in C# .NET

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