Question

我正在开发一个需要连接到https网站的项目。每次连接时，我的代码都会抛出异常，因为该站点的证书来自不受信任的站点。有没有办法绕过.net core http？

中的证书检查

我在.NET的早期版本中看到了这段代码。我想我只需要这样的东西。

 ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, sslPolicyErrors) => true;

Answer 1

您可以使用匿名回调函数覆盖HTTP调用的SSL证书检查，如此

using (var httpClientHandler = new HttpClientHandler())
{
   httpClientHandler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => { return true; };
   using (var client = new HttpClient(httpClientHandler))
   {
       // Make your request...
   }
}

此外，我建议为HttpClient使用工厂模式，因为它是一个共享对象，可能不会立即处理，因此connections will stay open。

Answer 2

<。> .Net Core中不支持ServicePointManager.ServerCertificateValidationCallback。

目前的情况是，它将是一个一个新的 ServerCertificateCustomValidationCallback 方法，用于即将发布的4.1。* System.Net.Http合约（HttpClient）。 .NET Core团队现在正在最终确定4.1合同。您可以在here on github

中了解相关信息

您可以直接在CoreFx或MYGET Feed中使用源代码来试用System.Net.Http 4.1的预发布版本： https://dotnet.myget.org/gallery/dotnet-core

Github上的当前WinHttpHandler.ServerCertificateCustomValidationCallback定义

Answer 3

来到这里寻找同一问题的答案，但我正在使用WCF进行.NET Core。如果你在同一条船上，请使用：

client.ClientCredentials.ServiceCertificate.SslCertificateAuthentication = 
    new X509ServiceCertificateAuthentication()
    {
        CertificateValidationMode = X509CertificateValidationMode.None,
        RevocationMode = X509RevocationMode.NoCheck
    };

Answer 4

我用这个解决：

Startup.cs

public void ConfigureServices(IServiceCollection services)
    {
        services.AddHttpClient("HttpClientWithSSLUntrusted").ConfigurePrimaryHttpMessageHandler(() => new HttpClientHandler
        {
            ClientCertificateOptions = ClientCertificateOption.Manual,
            ServerCertificateCustomValidationCallback =
            (httpRequestMessage, cert, cetChain, policyErrors) =>
            {
                return true;
            }
        });

YourService.cs

public UserService(IHttpClientFactory clientFactory, IOptions<AppSettings> appSettings)
    {
        _appSettings = appSettings.Value;
        _clientFactory = clientFactory;
    }

var request = new HttpRequestMessage(...

var client = _clientFactory.CreateClient("HttpClientWithSSLUntrusted");

HttpResponseMessage response = await client.SendAsync(request);

Answer 5

在.NET Core 2.2和Docker Linux容器上使用自签名证书和客户端证书auth时，我遇到了同样的问题。在开发Windows机器上一切正常，但是在Docker中出现了这样的错误：

System.Security.Authentication.AuthenticationException：根据验证过程，远程证书无效

幸运的是，证书是使用链生成的。当然，您始终可以忽略此解决方案，而使用上面的解决方案。

这是我的解决方法：

我使用Chrome将证书以 P7B 格式保存在计算机上。
使用以下命令将证书转换为PEM格式：
openssl pkcs7 -inform DER -outform PEM -in <cert>.p7b -print_certs > ca_bundle.crt
打开ca_bundle.crt文件并删除所有主题记录，保留一个干净的文件。下面的示例：

将这些行放入Dockerfile中（在最后一步中）：

    # Update system and install curl and ca-certificates
    RUN apt-get update && apt-get install -y curl && apt-get install -y ca-certificates
    # Copy your bundle file to the system trusted storage
    COPY ./ca_bundle.crt /usr/local/share/ca-certificates/ca_bundle.crt
    # During docker build, after this line you will get such output: 1 added, 0 removed; done.
    RUN update-ca-certificates

在应用程序中：

    var address = new EndpointAddress("https://serviceUrl");                
    var binding = new BasicHttpsBinding
    {
        CloseTimeout = new TimeSpan(0, 1, 0),
        OpenTimeout = new TimeSpan(0, 1, 0),
        ReceiveTimeout = new TimeSpan(0, 1, 0),
        SendTimeout = new TimeSpan(0, 1, 0),
        MaxBufferPoolSize = 524288,
        MaxBufferSize = 65536,
        MaxReceivedMessageSize = 65536,
        TextEncoding = Encoding.UTF8,
        TransferMode = TransferMode.Buffered,
        UseDefaultWebProxy = true,
        AllowCookies = false,
        BypassProxyOnLocal = false,
        ReaderQuotas = XmlDictionaryReaderQuotas.Max,
        Security =
        {
            Mode = BasicHttpsSecurityMode.Transport,
            Transport = new HttpTransportSecurity
            {
                ClientCredentialType = HttpClientCredentialType.Certificate,
                ProxyCredentialType = HttpProxyCredentialType.None
            }
        }
    };
    var client = new MyWSClient(binding, address);
    client.ClientCredentials.ClientCertificate.Certificate = GetClientCertificate("clientCert.pfx", "passwordForClientCert");
    // Client certs must be installed
    client.ClientCredentials.ServiceCertificate.SslCertificateAuthentication = new X509ServiceCertificateAuthentication
    {
        CertificateValidationMode = X509CertificateValidationMode.ChainTrust,
        TrustedStoreLocation = StoreLocation.LocalMachine,
        RevocationMode = X509RevocationMode.NoCheck
    };

GetClientCertificate方法：

private static X509Certificate2 GetClientCertificate(string clientCertName, string password)
{
    //Create X509Certificate2 object from .pfx file
    byte[] rawData = null;
    using (var f = new FileStream(Path.Combine(AppContext.BaseDirectory, clientCertName), FileMode.Open, FileAccess.Read))
    {
        var size = (int)f.Length;
        var rawData = new byte[size];
        f.Read(rawData, 0, size);
        f.Close();
    }
    return new X509Certificate2(rawData, password);
}

Answer 6

首先，请勿在生产中使用它

如果您使用的是AddHttpClient中间件，则将非常有用。我认为这是出于发展目的而不是生产目的。在创建有效证书之前，您可以使用此功能。

Func<HttpMessageHandler> configureHandler = () =>
        {
            var bypassCertValidation = Configuration.GetValue<bool>("BypassRemoteCertificateValidation");
            var handler = new HttpClientHandler();
            //!DO NOT DO IT IN PRODUCTION!! GO AND CREATE VALID CERTIFICATE!
            if (bypassCertValidation)
            {
                handler.ServerCertificateCustomValidationCallback = (httpRequestMessage, x509Certificate2, x509Chain, sslPolicyErrors) =>
                {
                    return true;
                };
            }
            return handler;
        };

并像

一样应用

services.AddHttpClient<IMyClient, MyClient>(x => { x.BaseAddress = new Uri("https://localhost:5005"); })
        .ConfigurePrimaryHttpMessageHandler(configureHandler);

Answer 7

允许所有证书非常强大，但这也很危险。如果您只想允许有效证书加上某些证书，可以这样进行。

using (var httpClientHandler = new HttpClientHandler())
{
    httpClientHandler.ServerCertificateCustomValidationCallback = (message, cert, chain, sslPolicyErrors) => {
        if (sslPolicyErrors == SslPolicyErrors.None)
        {
            return true;   //Is valid
        }

        if (cert.GetCertHashString() == "99E92D8447AEF30483B1D7527812C9B7B3A915A7")
        {
            return true;
        }
        return false;
    };
    using (var httpClient = new HttpClient(httpClientHandler))
    {
        var httpResponse = httpClient.GetAsync("https://example.com").Result;
    }
}

原始来源：

https://stackoverflow.com/a/44140506/3850405

Answer 8

这实际上很容易

services.AddHttpClient("HttpClientName", client => {
// code to configure headers etc..
}).ConfigurePrimaryHttpMessageHandler(() => {
                  var handler = new HttpClientHandler();
                  if (hostingEnvironment.IsDevelopment())
                  {
                      handler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => { return true; };
                  }
                  return handler;
              });

绕过.net核心中的无效SSL证书

8 个答案: