切记ajax中要带上AntiForgeryToken防止CSRF攻击

技术  /  管理员 发布于 7年前   219

经常看到在项目中ajax post数据到服务器不加防伪标记，造成CSRF攻击

在Asp.net Mvc里加入防伪标记很简单在表单中加入Html.AntiForgeryToken()即可。

Html.AntiForgeryToken()会生成一对加密的字符串，分别存放在Cookies 和 input 中。

我们在ajax post中也带上AntiForgeryToken

@model WebApplication1.Controllers.Person@{ ViewBag.Title = "Index";}<h2>Index</h2><form id="form1"> <div class="form-horizontal">  <h4>Persen</h4>  <hr />  @Html.ValidationSummary(true, "", new { @class = "text-danger" })  <div class="form-group">   @Html.LabelFor(model => model.Name, htmlAttributes: new { @class = "control-label col-md-2" })   <div class="col-md-10">    @Html.EditorFor(model => model.Name, new { htmlAttributes = new { @class = "form-control" } })    @Html.ValidationMessageFor(model => model.Name, "", new { @class = "text-danger" })   </div>  </div>  <div class="form-group">   @Html.LabelFor(model => model.Age, htmlAttributes: new { @class = "control-label col-md-2" })   <div class="col-md-10">    @Html.EditorFor(model => model.Age, new { htmlAttributes = new { @class = "form-control" } })    @Html.ValidationMessageFor(model => model.Age, "", new { @class = "text-danger" })   </div>  </div>  <div class="form-group">   <div class="col-md-offset-2 col-md-10">    <input type="button" id="save" value="Create" class="btn btn-default" />   </div>  </div> </div></form><script src="https:/article/~/Scripts/jquery-1.10.2.min.js"></script><script src="https:/article/~/Scripts/jquery.validate.min.js"></script><script src="https:/article/~/Scripts/jquery.validate.unobtrusive.min.js"></script><script type="text/javascript"> $(function () {  //var token = $('[name=__RequestVerificationToken]');  //获取防伪标记  var token = $('@Html.AntiForgeryToken()').val();  var headers = {};  //防伪标记放入headers  //也可以将防伪标记放入data  headers["__RequestVerificationToken"] = token;  $("#save").click(function () {   $.ajax({    type: 'POST',    url: '/Home/Index',    cache: false,    headers: headers,    data: { Name: "yangwen", Age: "1" },    success: function (data) {     alert(data)    },    error: function () {     alert("Error")    }   });  }) })</script>

放在cookies里面的加密字符串

控制器中代码

using System;using System.Collections.Generic;using System.Linq;using System.Net;using System.Web;using System.Web.Helpers;using System.Web.Mvc;namespace WebApplication1.Controllers { public class HomeController : Controller  {  public ActionResult Index()   {   return View();   }  [HttpPost]  [MyValidateAntiForgeryToken]  public ActionResult Index(Person p)   {   return Json(true, JsonRequestBehavior.AllowGet);   }  } public class Person  {  public string Name { get; set; }  public int Age { get; set; }  } public class MyValidateAntiForgeryToken : AuthorizeAttribute  {  public override void OnAuthorization(AuthorizationContext filterContext)   {   var request = filterContext.HttpContext.Request;   if (request.HttpMethod == WebRequestMethods.Http.Post)    {      if (request.IsAjaxRequest())     {     var antiForgeryCookie = request.Cookies[AntiForgeryConfig.CookieName];     var cookieValue = antiForgeryCookie != null      ? antiForgeryCookie.Value      : null;     //从cookies 和 Headers 中 验证防伪标记     //这里可以加try-catch     AntiForgery.Validate(cookieValue, request.Headers["__RequestVerificationToken"]);     }    else     {     new ValidateAntiForgeryTokenAttribute()      .OnAuthorization(filterContext);     }    }   }  } }

这里注释掉ajax中防伪标记在请求

$("#save").click(function () { $.ajax({  type: 'POST',  url: '/Home/Index',  cache: false, //  headers: headers,  data: { Name: "yangwen", Age: "1" },  success: function (data) {   alert(data)  },  error: function () {   alert("Error")  } });})

默认返回500的状态码。

这里修改ajax中的防伪标记

  $(function () { //var token = $('[name=__RequestVerificationToken]'); //获取防伪标记 var token = $('@Html.AntiForgeryToken()').val(); var headers = {}; //防伪标记放入headers //也可以将防伪标记放入data headers["__RequestVerificationToken"] = token+11111111111111111111111111111111111; $("#save").click(function () {  $.ajax({   type: 'POST',   url: '/Home/Index',   cache: false,    headers: headers,   data: { Name: "yangwen", Age: "1" },   success: function (data) {    alert(data)   },   error: function () {    alert("Error")   }  }); })})

也是500的状态码。

以上内容就是本文的全部叙述，切记ajax中要带上AntiForgeryToken防止CSRF攻击，小伙伴们在使用过程发现有疑问，请给我留言，谢谢！