调用域账户登录窗体代码,CSharp代码库,德仔网

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【CSharp】调用域账户登录窗体

作者:lyhabc / 发布于2015/2/28/ 537


	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Web;
	using System.Web.UI;
	using System.Web.UI.WebControls;
	namespace SureKAM.SPM.Portal.WebSite
	{
	 public partial class AccessDenied : System.Web.UI.Page
	 {
	 private int _authenticationAttempts = 0;
	 public int AuthenticationAttempts
	 {
	 get
	 {
	 if (!string.IsNullOrEmpty(string.Format("{0}", Session["AuthenticationAttempts"])))
	 {
	 int.TryParse(Session["AuthenticationAttempts"].ToString(), out _authenticationAttempts);
	 }
	 return _authenticationAttempts;
	 }
	 set
	 {
	 _authenticationAttempts = value;
	 Session["AuthenticationAttempts"] = _authenticationAttempts;
	 }
	 }
	 private string _currentUser = string.Empty;
	 public string CurrentUser
	 {
	 get
	 {
	 _currentUser = Request.LogonUserIdentity.Name;
	 Session["CurrentUser"] = _currentUser;
	 return _currentUser;
	 }
	 set
	 {
	 _currentUser = value;
	 Session["CurrentUser"] = _currentUser;
	 }
	 }
	 private string _previousUser = string.Empty;
	 public string PreviousUser
	 {
	 get
	 {
	 _previousUser = string.Format("{0}", Session["PreviousUser"]);
	 return _previousUser;
	 }
	 set
	 {
	 _previousUser = value;
	 Session["PreviousUser"] = _previousUser;
	 }
	 }
	 /// <summary>
	 /// This event fires on every page load
	 /// </summary>
	 /// <param name="sender"></param>
	 /// <param name="e"></param>
	 protected void Page_Load(object sender, EventArgs e)
	 {
	 // Make sure the browser does not cache this page
	 this.DisablePageCaching();
	 // Increase authentication attempts
	 this.AuthenticationAttempts = this.AuthenticationAttempts + 1;
	 if (this.AuthenticationAttempts == 1)
	 {
	 // Change previous user to current user
	 this.PreviousUser = this.CurrentUser;
	 // Send the first 401 response
	 this.Send401();
	 }
	 else
	 {
	 // When a browser is set to "automaticaly sign in with current credentials", we have to send two 401 responses to let the browser re-authenticate itself.
	 // I don't know how to determine if a browser is set to "automaticaly sign in with current credentials", so two 401 responses are always send when the user
	 // does not switch accounts. In Micrososft Office sharepoint the user has to supply the credentials 3 times, when the user does not switch accounts,
	 // so it think this is not a problem.
	 if (this.AuthenticationAttempts == 2 && this.CurrentUser.Equals(this.PreviousUser))
	 {
	 // Send the second 401 response
	 this.Send401();
	 }
	 else
	 {
	 // Clear the session of the current user. This will clear all sessions objects including the "AuthenticationAttempts"
	 Session.Abandon();
	 Session.Clear();
	 // Redirect back to the main page
	 Response.Redirect("~/Default.aspx");
	 }
	 }
	 }
	 /// <summary>
	 /// Make sure the browser does not cache this page
	 /// </summary>
	 public void DisablePageCaching()
	 {
	 Response.Expires = 0;
	 Response.Cache.SetNoStore();
	 Response.AppendHeader("Pragma", "no-cache");
	 }
	 /// <summary>
	 /// Send a 401 response
	 /// </summary>
	 public void Send401()
	 {
	 // Create a 401 response, the browser will show the log-in dialogbox, asking the user to supply new credentials, // if browser is not set to "automaticaly sign in with current credentials"
	 Response.Buffer = true;
	 Response.StatusCode = 401;
	 Response.StatusDescription = "Unauthorized";
	 // A authentication header must be supplied. This header can be changed to Negotiate when using keberos authentication
	 Response.AddHeader("WWW-Authenticate", "NTLM");
	 // Send the 401 response
	 Response.End();
	 }
	 }
	}

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