AJAX安全-Session做Token

个人思路，请大神看到了指点

个人理解token是防止扫号机或者恶意注册、恶意发表灌水，有些JS写的token算法，也会被抓出来被利用，个人感觉还是用会过期的Session做token更好，服务器存储，加载到客户端页面，然后进行对比

index.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="index.aspx.cs" Inherits="index" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
     <script type="text/javascript" src="jquery.js"></script>
     <script>
         function submist() {
             if ($("#HDToken").val() != null) {
                 var JsonData = {
                     Token: $("#HDToken").val(),
                     sid: Math.random()
                 };

                 $.ajax({
                     type: "post",
                     url: "index.ashx",
                     dataType: "json",
                     data: JsonData,
                     success: function (data) {
                         if (data[0].status == 'success') {

                             alert("成功" + data[0].message);


                         }
                         else {
                             alert("失败" + data[0].message);


                         }
                     },
                     error: function (data, status, e) {
                         alert("系统错误" + status + "|" + data[0].message);

                     }
                 });
             }
             else {
                 alert("回话过期，重新刷新页面");
                 return;
             }
         }
        
     
     </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <input id="HDToken" type="hidden"  runat="server" />
        <input id="Button1" type="button" value="提交"  onclick="submist()"/>
        <asp:Button ID="Button2" runat="server" Text="清除" onclick="Button2_Click" />
        </div>
    </form>
</body>
</html>

index.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class index : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

        if (!IsPostBack)
        {
            string Token = "";
            if (Session["Token"] == null)
            {
                Session["Token"] = DateTime.Now.ToString();
                Token = Session["Token"].ToString();
                HDToken.Value = FormsAuthentication.HashPasswordForStoringInConfigFile(Token, "md5").ToLower();//MD5加密后赋值给隐藏域
                //Response.Write(HDToken.Value);

            }
            else
            {
                    Token = Session["Token"].ToString();
                    HDToken.Value = FormsAuthentication.HashPasswordForStoringInConfigFile(Token, "md5").ToLower();
                   // Response.Write(HDToken.Value);

                    //以下为回话过期，可以放在Global.asax 做定时器
                    TimeSpan span=DateTime.Now.Subtract(Convert.ToDateTime(Session["Token"]));
                    int min = span.Minutes + 1;
                    if (min > 1)
                    {
                        Session.Remove("Token");//时间大于1分钟，移除
                    }
            }
             
        }
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        Session.Abandon();
    }
}

index.ashx

<%@ WebHandler Language="C#" Class="index" %>

using System;
using System.Web;
using System.Web.Security;
using System.Web.SessionState;

public class index : IHttpHandler, IRequiresSessionState
{

    public void ProcessRequest(HttpContext context)
    {
        context.Response.ContentType = "text/plain";
        string Token = context.Request["Token"];//获得隐藏域的值
        if (context.Session["Token"] != null)
        {
            
            if (FormsAuthentication.HashPasswordForStoringInConfigFile(context.Session["Token"].ToString(), "md5").ToLower() == Token)
            {
                context.Response.Write("[{"message":"成功","status":"success"}]");
                context.Response.End();
                return;
            }
            else
            {
                context.Response.Write("[{"message":"失败","status":"error"}]");
                context.Response.End();
                return;
            }
        }
        else
        {
            context.Response.Write("[{"message":"过期","status":"error"}]");
            context.Response.End();
            return;
        }
        
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }

}

另一种方法，在请求头部加入token

    if (!IsPostBack)
    {
                ///生成 Token
                string Token = new Random().NextDouble().ToString();
                Session["token"] = Token;
                System.Web.UI.HtmlControls.HtmlGenericControl script = new System.Web.UI.HtmlControls.HtmlGenericControl("script");
                script.Attributes.Add("type", "text/javascript");
                script.InnerHtml = @"
                $.ajaxSetup({
                beforeSend: function (xhr) {
                    xhr.setRequestHeader(""token"", """ + Token + @""");
                }
            });
             ";
                Page.Header.Controls.Add(script);
     }

在请求结果页面直接获得string Token = context.Request.Headers["token"];

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原文地址：https://www.cnblogs.com/qigege/p/4828289.html