asp.net-mvc - 我将如何编写一个 Action 过滤器来确保每个 Post 操作都使用防伪 token ？

Question

我想用AntiForgeryTokens在每个 HttpPost 操作上使用名为 ControllerBase 的 Controller 中的 ActionFilter每个其他 Controller 都继承自。

我想通过创建一个继承自 ValidateAntiForgeryToken 的 ActionFilter 来做到这一点。它接受一个参数，告诉它要应用哪些 HTTP 动词。然后我想在 ControllerBase 上应用该过滤器确保AntiForgeryToken检查整个站点上的每个 POST 操作。

我正在考虑使用 this solution ， 但

AuthorizationContext Constructor (ControllerContext)是一个过时的构造函数，我不确定如何使用推荐的 AuthorizationContext(ControllerContext controllerContext, ActionDescriptor actionDescriptor) 重建代码。 .

默认情况下它似乎不使用 AntiForgeryToken，因为我收到以下错误:A required anti-forgery token was not supplied or was invalid在每次发布操作之后。

我应该如何重写我的 ActionFilter 以满足当前的非过时标准并在每个 [HttpPost] 上正确使用防伪 token 动词？

我自己是否必须在每种形式中都包含一个防伪 token (我想我这样做了)？ (与自动生成相反 - 不要笑，我很好奇) 更新:正如评论中指出的那样；是的，这必须对每种表格都进行。

这是我的 ControllerBase 中的代码以供引用:

[UseAntiForgeryTokenOnPostByDefault]
public class ControllerBase : Controller 
{
    [AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
    public class BypassAntiForgeryTokenAttribute : ActionFilterAttribute
    {
    }

    [AttributeUsage(AttributeTargets.Class, AllowMultiple = false)]
    public class UseAntiForgeryTokenOnPostByDefault : ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            if (ShouldValidateAntiForgeryTokenManually(filterContext))
            {
                var authorizationContext = new AuthorizationContext(filterContext.Controller.ControllerContext);

                //Use the authorization of the anti forgery token, 
                //which can't be inhereted from because it is sealed
                new ValidateAntiForgeryTokenAttribute().OnAuthorization(authorizationContext);
            }

            base.OnActionExecuting(filterContext);
        }

        /// <summary>
        /// We should validate the anti forgery token manually if the following criteria are met:
        /// 1. The http method must be POST
        /// 2. There is not an existing [ValidateAntiForgeryToken] attribute on the action
        /// 3. There is no [BypassAntiForgeryToken] attribute on the action
        /// </summary>
        private static bool ShouldValidateAntiForgeryTokenManually(ActionExecutingContext filterContext)
        {
            var httpMethod = filterContext.HttpContext.Request.HttpMethod;

            //1. The http method must be POST
            if (httpMethod != "POST") return false;

            // 2. There is not an existing anti forgery token attribute on the action
            var antiForgeryAttributes =
                filterContext.ActionDescriptor.GetCustomAttributes(typeof (ValidateAntiForgeryTokenAttribute), false);

            if (antiForgeryAttributes.Length > 0) return false;

            // 3. There is no [BypassAntiForgeryToken] attribute on the action
            var ignoreAntiForgeryAttributes =
                filterContext.ActionDescriptor.GetCustomAttributes(typeof (BypassAntiForgeryTokenAttribute), false);

            if (ignoreAntiForgeryAttributes.Length > 0) return false;

            return true;
        }
    }
}

Answer 1

我使用了以下方法:

public class SkipCSRFCheckAttribute : Attribute
{
}

public class AntiForgeryTokenFilter : IAuthorizationFilter
{
    public void OnAuthorization(AuthorizationContext filterContext)
    {
        if (IsHttpPostRequest(filterContext) && !SkipCsrfCheck(filterContext))
            AntiForgery.Validate();
    }

    private static bool IsHttpPostRequest(AuthorizationContext filterContext)
    {
        return filterContext.RequestContext.HttpContext.Request.HttpMethod == HttpMethod.Post.ToString();
    }

    private static bool SkipCsrfCheck(AuthorizationContext filterContext)
    {
        return filterContext.ActionDescriptor.GetCustomAttributes(typeof (SkipCSRFCheck), false).Any();
    }
}

这使我们能够使用 SkipCSRFCheck 属性逐个禁用它，然后在 Application_Start 中将其注册为全局过滤器:

GlobalFilters.Filters.Add(new AntiForgeryTokenFilter());