我在我的BasePage类中有以下内容，所有我的ASPX页面都从这个类派生：
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
ViewStateUserKey = Session.SessionID;
}
我在Web.config中设置了machineKey。我认为这个错误不是由于Web农场引起的，因为在我的开发机器上也会出现这个问题。
我的主机现在升级到了.NET 3.5 SP1。在这个更新之后，每次使用上面所述的ViewStateUserKey设置编译时，每次回传(postback)都会不断地出现“验证viewstate MAC失败”的错误消息。
我做错了什么？在最新的框架更新中，这个设置是否仍然必要？
好的，我比较晚才参与这个讨论 - 但是这怎么能是正确答案呢？这只适用于已认证用户的情况，并且使用 ViewStateUserKey 作为用户名要比使用会话 ID GUID 更容易被猜测。
顺便说一下，如果您想要“修复”上面的代码，请使用会话 ID，但是您必须设置一个会话变量以防止会话 ID 每次都改变。例如：Session["Anything"] = DateTime.Now
ViewStateUserKey = Session.SessionID;
当然，这是基于您将使用会话的情况下，否则您需要使用其他密钥，例如用户名或保存在 cookie 中的任何其他 guid。
public partial class SiteMaster : MasterPage
{
private const string AntiXsrfTokenKey = "__AntiXsrfToken";
private const string AntiXsrfUserNameKey = "__AntiXsrfUserName";
private string _antiXsrfTokenValue;
protected void Page_Init(object sender, EventArgs e)
{
//First, check for the existence of the Anti-XSS cookie
var requestCookie = Request.Cookies[AntiXsrfTokenKey];
Guid requestCookieGuidValue;
//If the CSRF cookie is found, parse the token from the cookie.
//Then, set the global page variable and view state user
//key. The global variable will be used to validate that it matches in the view state form field in the Page.PreLoad
//method.
if (requestCookie != null
&& Guid.TryParse(requestCookie.Value, out requestCookieGuidValue))
{
//Set the global token variable so the cookie value can be
//validated against the value in the view state form field in
//the Page.PreLoad method.
_antiXsrfTokenValue = requestCookie.Value;
//Set the view state user key, which will be validated by the
//framework during each request
Page.ViewStateUserKey = _antiXsrfTokenValue;
}
//If the CSRF cookie is not found, then this is a new session.
else
{
//Generate a new Anti-XSRF token
_antiXsrfTokenValue = Guid.NewGuid().ToString("N");
//Set the view state user key, which will be validated by the
//framework during each request
Page.ViewStateUserKey = _antiXsrfTokenValue;
//Create the non-persistent CSRF cookie
var responseCookie = new HttpCookie(AntiXsrfTokenKey)
{
//Set the HttpOnly property to prevent the cookie from
//being accessed by client side script
HttpOnly = true,
//Add the Anti-XSRF token to the cookie value
Value = _antiXsrfTokenValue
};
//If we are using SSL, the cookie should be set to secure to
//prevent it from being sent over HTTP connections
if (FormsAuthentication.RequireSSL &&
Request.IsSecureConnection)
responseCookie.Secure = true;
//Add the CSRF cookie to the response
Response.Cookies.Set(responseCookie);
}
Page.PreLoad += master_Page_PreLoad;
}
protected void master_Page_PreLoad(object sender, EventArgs e)
{
//During the initial page load, add the Anti-XSRF token and user
//name to the ViewState
if (!IsPostBack)
{
//Set Anti-XSRF token
ViewState[AntiXsrfTokenKey] = Page.ViewStateUserKey;
//If a user name is assigned, set the user name
ViewState[AntiXsrfUserNameKey] =
Context.User.Identity.Name ?? String.Empty;
}
//During all subsequent post backs to the page, the token value from
//the cookie should be validated against the token in the view state
//form field. Additionally user name should be compared to the
//authenticated users name
else
{
//Validate the Anti-XSRF token
if ((string)ViewState[AntiXsrfTokenKey] != _antiXsrfTokenValue
|| (string)ViewState[AntiXsrfUserNameKey] !=
(Context.User.Identity.Name ?? String.Empty))
{
throw new InvalidOperationException("Validation of
Anti-XSRF token failed.");
}
}
}
}
我现在已经通过改变代码来解决了这个问题：
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
if (User.Identity.IsAuthenticated)
ViewStateUserKey = User.Identity.Name;
}
<forms defaultUrl="~/" loginUrl="~/Account/Login.aspx" requireSSL="false" timeout="2880" />
但是在我的httpcookies标签中，我设置了requireSSL=true。由于在Site.Master.cs中使用cookie来设置ViewStateUserKey，所以出现了问题。
因此我一直收到错误信息。
我将其修改为false并重新启动了Web应用程序，现在一切都很好。