c# - 在 C# 中验证 Java SAML 响应

Question

我正在查看有关验证 Java 在 C# 中生成的 SAML 响应的各种帖子。我一直在尝试所有建议，但仍然从 SignedXml.CheckSignature 中得到错误，现在我完全不知道可能出了什么问题，我正在联系你们，看看你们是否有建议我可以使用。

响应中的签名节点是

 <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
  <ds:SignedInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
   <ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"/>
   <ds:SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"/>
   <ds:Reference URI="#SM16afb708b851b15451d92108ac8c6a2a627a2643667" xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
    <ds:Transforms xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
     <ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"/>
     <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"/>
    </ds:Transforms>
    <ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" xmlns:ds="http://www.w3.org/2000/09/xmldsig#"/>
    <ds:DigestValue xmlns:ds="http://www.w3.org/2000/09/xmldsig#">kOlL02M8icLI1MtFnFUAcf/yols=</ds:DigestValue>
   </ds:Reference>
  </ds:SignedInfo>
  <ds:SignatureValue xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
   d2wjnwPdzDrsWvMq9EElkb0TVsj8LmMXqTusPuG3GbxsqVLFryqaMkwv/whTYD/evw8WNClJm1nC
   VpGTEPEB/voPiFJaNpdwvs6a6PuTizLQQaqOC1H6JC6KboUVR87wuJ4kV3W9QoGEft+OmZXMgUU6
   54PgOX3d/czqlQWS9Z8=
  </ds:SignatureValue>
  <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
   <ds:X509Data xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
    <ds:X509Certificate xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
     MIICCjCCAXOgAwIBAgIQazR4XEyfFItIKZvB/IC3/jANBgkqhkiG9w0BAQQFADATMREwDwYDVQQD
     EwhTYW1sVGVzdDAgFw0wMDAxMDEwNDAwMDBaGA8yMDk5MDEwMTA0MDAwMFowEzERMA8GA1UEAxMI
     U2FtbFRlc3QwgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJAoGBAK4kfW9Jg/WtQ+4yy631r2qkCVyK
     odGL0A3lg+4w3BfCSGf4N7GkAlHI4G582tC4tlwd/mj/IvN6qxhIyu45OlENZhWOXFOCogoX7Tfx
     Vd7XRUqNwdndjy9KY7uyIrXVczpGbk+ahp6SS0NAG9i1rYR/pxTvW4zUHkrFbgm8gdghAgMBAAGj
     XTBbMBMGA1UdJQQMMAoGCCsGAQUFBwMDMEQGA1UdAQQ9MDuAEHITUeo8fKKVys7DcdV65hmhFTAT
     MREwDwYDVQQDEwhTYW1sVGVzdIIQazR4XEyfFItIKZvB/IC3/jANBgkqhkiG9w0BAQQFAAOBgQA/
     Dm+yk4K3q8AG3q4dorWswL8fwU9dpjuvheRjAveaL5kr59QRanG+lLi8Wefg6iTPKDgIGc2VG13T
     KP7pZSysaXJ5i8N0zCg+eu/YL7Hw1kSXW/CdxwQ+qI1W53fQ9NXlLVWPXhIepAOL46EEZgACHEhv
     tG30XtStycyLOsgm9A==
    </ds:X509Certificate>
   </ds:X509Data>
  </ds:KeyInfo>
 </ds:Signature>

我用来验证响应的 C# 代码是

try
{
    XmlDocument xmlDoc = new XmlDocument();
    xmlDoc.PreserveWhitespace = true;
    xmlDoc.Load(@"C:\SAMLSSOResponse.txt");

    XmlNamespaceManager _documentNamespaceManager;
    _documentNamespaceManager = new XmlNamespaceManager(xmlDoc.NameTable);
    _documentNamespaceManager.AddNamespace("ds", "http://www.w3.org/2000/09/xmldsig#");
    _documentNamespaceManager.AddNamespace("samlp", "urn:oasis:names:tc:SAML:1.0:protocol");
    _documentNamespaceManager.AddNamespace("saml", "urn:oasis:names:tc:SAML:1.0:assertion");

    SignedXml signedXml = new SignedXml(xmlDoc);
    XmlNodeList nodeList = xmlDoc.GetElementsByTagName("ds:Signature");

    XmlNode xmlNode = xmlDoc.DocumentElement.SelectSingleNode("/samlp:Response/ds:Signature", _documentNamespaceManager);
    //xmlDoc.GetElementsByTagName("Signature");
    //signedXml.LoadXml((XmlElement)xmlNode);
    signedXml.LoadXml((XmlElement)nodeList[0]);

    X509Certificate2 certificate = null;
    foreach (KeyInfoClause clause in signedXml.KeyInfo)
    {
        if (clause is KeyInfoX509Data)
        {
            if (((KeyInfoX509Data)clause).Certificates.Count > 0)
            {
                certificate = (X509Certificate2)((KeyInfoX509Data)clause).Certificates[0];
            }
        }
    }

    if (certificate == null)
    {
        Console.WriteLine("No Certificate found");
    }

    Console.WriteLine("Testing with Certificate in the XML");
    if (signedXml.CheckSignature(certificate, true))
        Console.WriteLine("Validated");
    else
        Console.WriteLine("Failed");
}
catch (Exception ex)
{
}

我什至尝试通过在代码中加载证书来验证签名，但仍然遇到同样的问题。

有人对签名未得到验证的原因有任何建议吗？

Answer 1

我解决了这个问题。我必须处理多个问题:

1. 我正在处理的响应是我收到的但未验证的字符串。当我获得 Base64Encoded 字符串并尝试验证它时，出现了一个不同的错误(格式错误的引用元素)，该错误已通过步骤 2 解决。

2. 通过创建一个继承自 SignedXML 的新类，然后覆盖 GetIdElement 类，已解决格式错误的引用元素问题。这是代码:

public class SamlSignedXml : SignedXml    {        private string _referenceAttributeId = "";        public SamlSignedXml(XmlElement element, string referenceAttributeId)            : base(element)        {            _referenceAttributeId = referenceAttributeId;        }        public override XmlElement GetIdElement(            XmlDocument document, string idValue)        {            return (XmlElement)                document.SelectSingleNode(                    string.Format("//*[@{0}='{1}']",                    _referenceAttributeId, idValue));        }    }

当您创建 SamlSignedXml 类的实例时，请执行以下操作:SamlSignedXmlsignedXml = new SamlSignedXml(element, "ResponseID");

其中 element 是 XmlDocument.DocumentElement。

问题解决了