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记得ajax中要带上AntiForgeryToken防止CSRF攻击

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="~/Scripts/jquery-1.10.2.min.js"></script> <script src="~/Scripts/jquery.validate.min.js"></script> <script src="~/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>

记得ajax中要带上AntiForgeryToken防止CSRF攻击

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")   }  }); })

记得ajax中要带上AntiForgeryToken防止CSRF攻击

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")    }   });  }) })