c# - 如何在 WCF soap 响应中实现安全 token ？

Question

我正在实现银行的 API，他们需要提供安全 token 。在每个 soap 消息的标题中都有如下内容:

<soapenv:Header>
  <tpw:BinarySecurityToken ValueType="MAC" Id="DesMacToken" EncodingType="Base64" Value="**xvz**"/>
</soapenv:Header>

根据他们的文档，我需要在每条消息的正文中生成一个 8 字节的 MAC 值。 MAC 由 CBC-MAC 算法和 DES 作为分组密码生成。每条消息的soapenv:Body标签的内容作为MAC计算的数据。

所以我的问题是如何让 WCF 执行此操作？我已将以下代码放在一起以创建 MAC 值，但不确定如何将其放入每条消息的 header 中。

private string GenerateMAC(string SoapXML)
        {
            ASCIIEncoding encoding = new ASCIIEncoding();

            //Convert from Hex to Bin
            byte[] Key = StringToByteArray(HexKey);
            //Convert String to Bytes
            byte[] XML = encoding.GetBytes(SoapXML);

            //Perform the Mac goodies
            MACTripleDES DesMac = new MACTripleDES(Key);
            byte[] Mac = DesMac.ComputeHash(XML);

            //Base64 the Mac
            string Base64Mac = Convert.ToBase64String(Mac);

            return Base64Mac;
        }

        public static byte[] StringToByteArray(string Hex)
        {
            if (Hex.Length % 2 != 0)
            {
                throw new ArgumentException();
            }

            byte[] HexAsBin = new byte[Hex.Length / 2];
            for (int index = 0; index < HexAsBin.Length; index++)
            {
                string bytevalue = Hex.Substring(index * 2, 2);
                HexAsBin[index] = Convert.ToByte(bytevalue, 16);
            }

            return HexAsBin;
        }

任何帮助将不胜感激。

更多信息:银行提供了一个 WSDL，我将其用作服务引用。发送的响应示例:

[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "4.0.0.0")]
[System.ServiceModel.MessageContractAttribute(WrapperName="LogonRequest", WrapperNamespace="http://webservice.com", IsWrapped=true)]
public partial class LogonRequest {

    [System.ServiceModel.MessageHeaderAttribute(Namespace="http://webservice.com")]
    public DataAccess.BankService.BinarySecurityToken BinarySecurityToken;

BinarySecurityToken(位于 header 中)如下所示:

 [System.CodeDom.Compiler.GeneratedCodeAttribute("System.Xml", "4.0.30319.233")]
    [System.SerializableAttribute()]
    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    [System.Xml.Serialization.XmlTypeAttribute(AnonymousType=true, Namespace="http://webservice.com")]
    public partial class BinarySecurityToken : object, System.ComponentModel.INotifyPropertyChanged {

        private string valueTypeField;

        private string idField;

        private string encodingTypeField;

        private string valueField;

        public BinarySecurityToken() {
            this.valueTypeField = "MAC";
            this.idField = "DesMacToken";
            this.encodingTypeField = "Base64";
        }

Answer 1

我最近不得不做这样的事情，我最终做的是创建一个实现 IClientMessageInspector 的行为，并使用 BeforeSendRequest 方法为我的 header 创建数据，然后将其填充到 SOAP 请求中。

public class SoapHeaderBehaviour : BehaviorExtensionElement, IClientMessageInspector
{
    public void AfterReceiveReply(ref Message reply, object correlationState) { }
    public object BeforeSendRequest(ref Message request, IClientChannel channel)
    { 
        var security = new Security();   // details irrelevant
        var messageHeader = MessageHeader.CreateHeader("Security", "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd", security, new ConcreteXmlObjectSerializer(typeof(Security)), true);
        request.Headers.Add(messageHeader);

        return null;
    }

    protected override object CreateBehavior() { return new SoapHeaderBehaviour(); }
    public override Type BehaviorType { get { return GetType(); } }
}

ConcreteXmlObjectSerializer 是我在互联网某个地方找到的一个类(遗憾的是现在似乎找不到)，它刚刚起作用。这是相关代码:

public class ConcreteXmlObjectSerializer : XmlObjectSerializer
{
    readonly Type objectType;
    XmlSerializer serializer;

    public ConcreteXmlObjectSerializer(Type objectType)
        : this(objectType, null, null)
    {
    }

    public ConcreteXmlObjectSerializer(Type objectType, string wrapperName, string wrapperNamespace)
    {
        if (objectType == null)
            throw new ArgumentNullException("objectType");
        if ((wrapperName == null) != (wrapperNamespace == null))
            throw new ArgumentException("wrapperName and wrapperNamespace must be either both null or both non-null.");
        if (wrapperName == string.Empty)
            throw new ArgumentException("Cannot be the empty string.", "wrapperName");

        this.objectType = objectType;
        if (wrapperName != null)
        {
            XmlRootAttribute root = new XmlRootAttribute(wrapperName);
            root.Namespace = wrapperNamespace;
            this.serializer = new XmlSerializer(objectType, root);
        }
        else
            this.serializer = new XmlSerializer(objectType);
    }

    public override bool IsStartObject(XmlDictionaryReader reader)
    {
        throw new NotImplementedException();
    }

    public override object ReadObject(XmlDictionaryReader reader, bool verifyObjectName)
    {
        Debug.Assert(serializer != null);
        if (reader == null) throw new ArgumentNullException("reader");
        if (!verifyObjectName)
            throw new NotSupportedException();

        return serializer.Deserialize(reader);
    }

    public override void WriteStartObject(XmlDictionaryWriter writer, object graph)
    {
        throw new NotImplementedException();
    }

    public override void WriteObjectContent(XmlDictionaryWriter writer, object graph)
    {
        if (writer == null) throw new ArgumentNullException("writer");
        if (writer.WriteState != WriteState.Element)
            throw new SerializationException(string.Format("WriteState '{0}' not valid. Caller must write start element before serializing in contentOnly mode.",
                writer.WriteState));
        using (MemoryStream memoryStream = new MemoryStream())
        {
            using (XmlDictionaryWriter bufferWriter = XmlDictionaryWriter.CreateTextWriter(memoryStream, Encoding.UTF8))
            {
                serializer.Serialize(bufferWriter, graph);
                bufferWriter.Flush();
                memoryStream.Position = 0;
                using (XmlReader reader = new XmlTextReader(memoryStream))
                {
                    reader.MoveToContent();
                    writer.WriteAttributes(reader, false);
                    if (reader.Read()) // move off start node (we want to skip it)
                    {
                        while (reader.NodeType != XmlNodeType.EndElement) // also skip end node.
                            writer.WriteNode(reader, false); // this will take us to the start of the next child node, or the end node.
                        reader.ReadEndElement(); // not necessary, but clean
                    }
                }
            }
        }
    }

    public override void WriteEndObject(XmlDictionaryWriter writer)
    {
        throw new NotImplementedException();
    }

    public override void WriteObject(XmlDictionaryWriter writer, object graph)
    {
        Debug.Assert(serializer != null);
        if (writer == null) throw new ArgumentNullException("writer");
        serializer.Serialize(writer, graph);
    }
}

然后分 3 步通过配置文件将其连接到 WCF 客户端端点(全部在 system.serviceModel 节点下:

注册扩展

<extensions>
  <behaviorExtensions>
    <add name="ClientSoapHeaderAdderBehaviour"
        type="MyNamespace.SoapHeaderBehaviour, MyAssembly, Version=My.Version, Culture=neutral, PublicKeyToken=null" />
  </behaviorExtensions>
</extensions>

使用它创建端点行为

<behaviors>
  <endpointBehaviors>
    <behavior name="MyEndpointBehaviours">
      <ClientSoapHeaderAdderBehaviour />
    </behavior>
  </endpointBehaviors>
</behaviors>

将您的端点行为附加到您的客户端端点

<client>
  <endpoint address="blah" binding="basicHttpBinding"
    bindingConfiguration="blah" contract="blah"
    name="blah"
    behaviorConfiguration="MyEndpointBehaviours"/>
</client>

希望对你有帮助。