Web API CSRF保护实现
这次自己实现了类似jQuery中ajax调用的方法，并且针对RESTFul进行了改造和集成，实现的A2D AJAX接口如下：
$.ajax.RESTFulGetCollection("/api/Users", function (data) { alert(data[5].FirstName); });
$.ajax.RESTFulGetOne("/api/Users/1", function (data) { alert(data.UserID); });
$.ajax.RESTFulDelete("/api/Users/1", function (data) { alert("deleted"); });
$.ajax.RESTFulPost("/api/Users", { UserID: 0, FirstName: "aa", LastName: "bbb"}, function (data) { alert("added"); });
$.ajax.RESTFulPut("/api/Users/1", { UserID: 0, FirstName: "aa", LastName: "bbb"}, function (data) { alert(data); });
我们再深入点，要是别人恶意访问Delete的url呢？比如CSRF攻击。普通webform或者普通MVC方式可以比较方便的阻止攻击, 方法参考这篇文章的A8章节
答案：使用http header来传递token。步骤如下（以A2D与ASP.NET WEBAPI配合为例）：
@functions{
public string TokenHeaderValue()
{
string cookieToken, formToken;
AntiForgery.GetTokens(null, out cookieToken, out formToken);
return cookieToken + ":" + formToken;
}
}
$.ajax.Config.CSRFToken="@TokenHeaderValue()"; //把生成的token赋给A2D的ajax
$.ajax.RESTFulGetCollection("/api/Users", function (data) { alert(data[5].FirstName); });
$.ajax.RESTFulGetOne("/api/Users/1", function (data) { alert(data.UserID); });
$.ajax.RESTFulDelete("/api/Users/1", function (data) { alert("deleted"); });
$.ajax.RESTFulPost("/api/Users", { UserID: 0, FirstName: "aa", LastName: "bbb"}, function (data) { alert("added"); });
$.ajax.RESTFulPut("/api/Users/1", { UserID: 0, FirstName: "aa", LastName: "bbb"}, function (data) { alert(data); });
然后编写webapi的handler：
public class CSRFHandler : DelegatingHandler
{
protected override System.Threading.Tasks.Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)
{
if (request.Method == HttpMethod.Post ||
request.Method == HttpMethod.Put ||
request.Method == HttpMethod.Delete)//这里csrf只针对这3种请求才会验证
{
ValidateRequestHeader(request);
} return base.SendAsync(request, cancellationToken);
} private void ValidateRequestHeader(HttpRequestMessage request)
{
string cookieToken = "";
string formToken = ""; IEnumerable<string> tokenHeaders;
if (request.Headers.TryGetValues("A2D-CSRFToken", out tokenHeaders)) //这个header值要和A2D框架中的一致
{
string[] tokens = tokenHeaders.First().Split(':');
if (tokens.Length == 2)
{
cookieToken = tokens[0].Trim();
formToken = tokens[1].Trim();
}
}
AntiForgery.Validate(cookieToken, formToken);
}
}
最后在WebApiConfig中注册这个handler
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
config.MessageHandlers.Add(new CSRFHandler()); config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);
}
}
好了，都搞定了。
code download.
分类: js框架