我的问题是我不想使用MVC,只想用WebApi支持的静态HTML文件。这是我做的事情(这样行吗?)创建一个Http模块,在提供任何静态文件时设置随机cookie值。例如:
public class XSRFModule : IHttpModule {
...
void context_EndRequest(object sender, EventArgs e) {
if (Path.GetExtension(HttpContext.Current.Request.Path) == ".html") {
HttpContext.Current.Response.Cookies.Add(new HttpCookie("XSRF-TOKEN", Guid.NewGuid().ToString()));
}
}
}
然后在您的 HTML 页面中,使用 JavaScript 在调用 API 时将 cookie 值添加到标头中:
function callApi() {
xhr = new XMLHttpRequest();
xhr.open("GET", "api/data", true);
var regex = /\b(?:XSRF-TOKEN=)(.*?)(?=\s|$)/
var match = regex.exec(document.cookie);
xhr.setRequestHeader("X-XSRF-TOKEN", match[1]);
xhr.send();
}
最后,在您的HttpModule
中,在处理任何对您的API的调用之前,请检查Cookie与标头是否匹配:
void context_BeginRequest(object sender, EventArgs e)
{
if (HttpContext.Current.Request.Path.StartsWith("/api"))
{
string fromCookie = HttpContext.Current.Request.Cookies.Get("XSRF-TOKEN").Value;
string fromHeader = HttpContext.Current.Request.Headers["X-XSRF-TOKEN"];
if (fromCookie != fromHeader)
{
HttpContext.Current.Response.StatusCode = (int)HttpStatusCode.Forbidden;
HttpContext.Current.Response.End();
}
}
}
您需要将HttpOnly
标志设置为FALSE
,以便来自您域的JavaScript可以读取cookie并设置标头。我不是安全专家,因此我想从社区的其他成员那里获得一些关于这个解决方案的反馈。
编辑
如果您使用OWIN,可以使用全局操作过滤器和中间件插件:
Startup.cs
app.UseStaticFiles(new StaticFileOptions {
OnPrepareResponse = (responseContext) => {
responseContext.OwinContext.Response.Cookies.Append("XSRF-TOKEN", Guid.NewGuid().ToString());
},
FileSystem = "wwwroot"
});
XsrfFilter.cs
public class XsrfFilter : ActionFilterAttribute {
public override void OnActionExecuting(System.Web.Http.Controllers.HttpActionContext actionContext) {
string fromCookie = actionContext.Request.Headers.GetCookies("XSRF-TOKEN").FirstOrDefault()["XSRF-TOKEN"].Value;
string fromHeader = actionContext.Request.Headers.GetValues("X-XSRF-TOKEN").FirstOrDefault();
if (fromCookie == fromHeader) return;
actionContext.Response = new HttpResponseMessage(HttpStatusCode.OK);
actionContext.Response.ReasonPhrase = "bad request";
}
}