在一次调用中为代理服务器和 WCF 服务提供凭据？

Question

我有一个 C# 应用程序，它通过代理服务器调用 WCF 服务。代理和 WCF 服务都需要（不同的）凭据。我正在使用 svcutil 生成的代理类访问 WCF 服务。

当我关闭代理服务器对凭据的要求时，我可以正常访问 WCF 服务，所以我只想知道在哪里应用代理服务器的凭据（我在我的开发环境中使用 Fiddler ).

我读过各种帖子说要在 client.ClientCredentials 中设置凭据，这似乎适用于代理服务器凭据或 WCF 服务凭据，但我不能同时存储两者。如果我将代理服务器凭据放在 client.ClientCredentials 中，则请求会到达 WCF 服务，但随后会被拒绝。如果我将 WCF 服务凭据放在 client.ClientCredentials 中，则请求不会通过代理服务器。

有没有办法提供两组不同的凭据，以便我可以通过代理服务器和 WCF 服务进行身份验证？我需要在代码中执行此操作，而不是在配置文件中。

代码如下：

public class Runner
{
    public int GetAvailableFacilities(int timeoutInSeconds, string uri, string userName, string password)
    {
        FacilitySearchServiceClient client = null;
        try
        {
            client = SetClient(timeoutInSeconds, uri, userName, password, client);

            string outputMessage = null;
            int[] availableFacilities = client.GetAvailableFacilities(out outputMessage);
            return availableFacilities.Length;
        }
        finally
        {
            if (client != null)
            {
                client.Close();
            }
        }
    }

    private FacilitySearchServiceClient SetClient(int timeoutInSeconds, string uri, string wcfServiceUserName, string wcfServicePassword, FacilitySearchServiceClient client)
    {
        string proxyServerUsername = "1";//Fiddler
        string proxyServerPassword = "1";//Fiddler
        client = new FacilitySearchServiceClient(ConfigureServiceBinding(timeoutInSeconds), new EndpointAddress(uri));

        //If this is the only uncommented call to SetServiceCredentials the proxy server transmits the request 
        //to the wcf service which then rejects the authentication attempt.
        SetServiceCredentials(client.ClientCredentials, proxyServerUsername, proxyServerPassword);

        //If this is the only uncommented call to SetServiceCredentials the proxy server rejects the authentication attempt, 
        //resulting in an EndpointNotFoundException. 
        SetServiceCredentials(client.ClientCredentials, wcfServiceUserName, wcfServicePassword);

        return client;
    }

    protected static void SetServiceCredentials(ClientCredentials credentials, string userName, string password)
    {
        credentials.UserName.UserName = userName;
        credentials.UserName.Password = password;
    }

    protected CustomBinding ConfigureServiceBinding(int timeoutInSeconds)
    {
        CustomBinding binding = new CustomBinding();
        SecurityBindingElement sbe = SecurityBindingElement.CreateUserNameOverTransportBindingElement();
        sbe.IncludeTimestamp = false;
        sbe.EnableUnsecuredResponse = true;
        sbe.AllowInsecureTransport = true;
        binding.Elements.Add(sbe);
        binding.Elements.Add(new TextMessageEncodingBindingElement(MessageVersion.Soap11, System.Text.Encoding.UTF8));
        binding.Elements.Add(CreateHttpsBindingElement(Const.ProxyServerUrl));
        return binding;
    }

    /// <summary>
    /// Sets up the element needed for the web service call.
    /// </summary>
    private static HttpsTransportBindingElement CreateHttpsBindingElement(string proxyUri)
    {
        HttpsTransportBindingElement tpt = new HttpsTransportBindingElement();
        tpt.TransferMode = TransferMode.Streamed;
        tpt.MaxReceivedMessageSize = Int32.MaxValue;
        tpt.MaxBufferSize = Int32.MaxValue;
        tpt.AuthenticationScheme = System.Net.AuthenticationSchemes.Anonymous;          
        if (string.IsNullOrEmpty(proxyUri) == false)
        {
            tpt.ProxyAddress = new Uri(proxyUri);
            tpt.UseDefaultWebProxy = false;
            tpt.ProxyAuthenticationScheme = System.Net.AuthenticationSchemes.Basic;
        }
        return tpt;
    }


}

Answer 1

我运行几个月前遇到了这个完全相同的问题。问题是 WCF 客户端代理没有公开单独的属性来指定代理服务器凭据，例如 HttpWebRequest 对象公开类型 System.Net.WebProxy 的代理属性。在那种情况下，您可以只使用 System.Net.WebProxy 类型的 Credentials 属性来实现您想要做的事情。在您的情况下，您可以通过修改 Global.asax.cs 中的 Application_Start 方法（假设您的客户端也是一个网络应用程序）。否则，您可以在客户端应用程序的适当启动方法中使用此代码。

protected void Application_Start(Object sender, EventArgs e)
{
   var proxy = new WebProxy("myproxyservername", <myproxyPort>) { Credentials = new System.Net.NetworkCredential("yourproxyusername", "yourproxypassword") };
   WebRequest.DefaultWebProxy = proxy;
}

在一次调用中为代理服务器和 WCF 服务提供凭据？

Supplying credentials for a proxy server and WCF service in one call?

.net

c#

wcf

proxy

web-services