c# - 解密在 HTTPS 实例上生成的 WebResource.axd URL

Question

我有下面提到的代码:

string urlEncodedData = URL.Text;

byte[] encryptedData = HttpServerUtility.UrlTokenDecode(urlEncodedData);

Type machineKeySection = typeof(System.Web.Configuration.MachineKeySection);
Type[] paramTypes = new Type[] { typeof(bool), typeof(byte[]), typeof(byte[]), typeof(int), typeof(int) };
MethodInfo encryptOrDecryptData = machineKeySection.GetMethod("EncryptOrDecryptData", BindingFlags.Static | BindingFlags.NonPublic, null, paramTypes, null);

try
{
     byte[] decryptedData = (byte[])encryptOrDecryptData.Invoke(null, new object[] { false, encryptedData, null, 0, encryptedData.Length });
     string decrypted = Encoding.UTF8.GetString(decryptedData);

     decryptedLabel.BackColor = Color.Lime;
     decryptedLabel.Text = decrypted;
}
catch (TargetInvocationException)
{
     decryptedLabel.BackColor = Color.Red;
     decryptedLabel.Text = "Error decrypting data. Are you running your page on the same server and inside the same application as the web resource URL that was generated?";
}

它解密并告诉我有关网络资源的详细信息。在本地它工作正常。

但是在生产中它总是给我以下来自 catch block 的消息

解密数据时出错。您是否在与生成的网络资源 URL 相同的服务器和相同的应用程序中运行您的页面？

我唯一的区别是生产是在 HTTPS 上进行的。以上代码是否也适用于 HTTPS，还是我必须对其进行更改？

Answer 1

我也曾使用此代码片段来解密 webresource.axd 参数，但最近它停止工作了。

可能是框架更改为 4.5，因为我在 .net 资源中找到了这条评论 - 页面类，方法 DecryptString http://referencesource.microsoft.com/#System.Web/UI/Page.cs,18cf7b1fe99faea6

if (AspNetCryptoServiceProvider.Instance.IsDefaultProvider) {
            // ASP.NET 4.5 Crypto DCR: Go through the new AspNetCryptoServiceProvider
            // if we're configured to do so.
            ICryptoService cryptoService = AspNetCryptoServiceProvider.Instance.GetCryptoService(purpose, CryptoServiceOptions.CacheableOutput);
            clearData = cryptoService.Unprotect(protectedData);
        }
        else {
            // If we're not configured to go through the new crypto routines,
            // fall back to the standard MachineKey crypto routines.
#pragma warning disable 618 // calling obsolete methods
            clearData = MachineKeySection.EncryptOrDecryptData(fEncrypt: false, buf: protectedData, modifier: null, start: 0, length: protectedData.Length, useValidationSymAlgo: false, useLegacyMode: false, ivType: IVType.Hash);
#pragma warning restore 618 // calling obsolete methods
        } 

您确定唯一的区别是 http 和 https，也许框架版本也是如此？

尽管如此，我使用方法 DecryptString 而不是 EncryptOrDecryptData，下面的代码对我有用。您可以检查这是否也适合您:)

private static string Decrypt(string webResourceParameter)
    {
        var purposeType = Type.GetType("System.Web.Security.Cryptography.Purpose, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a");

        if (purposeType == null)
            return null;

        try
        {
            var purpose = Activator.CreateInstance(purposeType, "AssemblyResourceLoader.WebResourceUrl");

            const BindingFlags decryptFlags = BindingFlags.NonPublic | BindingFlags.Static;
            var decryptString = typeof (Page).GetMethod("DecryptString", decryptFlags);

            var decrypt = decryptString.Invoke(null, new[] {webResourceParameter, purpose}) as string;
            return decrypt;
        }
        catch (Exception ex)
        {
            return null;
        }
    }