Question

我正在尝试在请求Https资源时找到忽略证书检查的方法，到目前为止，我在互联网上找到了一些有用的文章。

但我还是有一些问题。请查看我的代码。我只是不明白代码ServicePointManager.ServerCertificateValidationCallback是什么意思。

何时调用此委托方法？还有一个问题，我应该在哪个地方编写这段代码？ ServicePointManager.ServerCertificateValidationCallback执行前或Stream stream = request.GetRequestStream()之前？

public HttpWebRequest GetRequest()
{
    CookieContainer cookieContainer = new CookieContainer();

    // Create a request to the server
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(_remoteUrl);

    #region Set request parameters

    request.Method = _context.Request.HttpMethod;
    request.UserAgent = _context.Request.UserAgent;
    request.KeepAlive = true;
    request.CookieContainer = cookieContainer;
    request.PreAuthenticate = true;
    request.AllowAutoRedirect = false;

    #endregion

    // For POST, write the post data extracted from the incoming request
    if (request.Method == "POST")
    {
        Stream clientStream = _context.Request.InputStream;
        request.ContentType = _context.Request.ContentType;
        request.ContentLength = clientStream.Length;

        ServicePointManager.ServerCertificateValidationCallback = delegate(
            Object obj, X509Certificate certificate, X509Chain chain, 
            SslPolicyErrors errors)
            {
                return (true);
            };

            Stream stream = request.GetRequestStream();

            ....
        }

        ....

        return request;
    }
}

Answer 1

对于有兴趣在每个请求的基础上应用此解决方案的任何人，这是一个选项并使用Lambda表达式。同样的Lambda表达式也可以应用于blak3r提到的全局过滤器。此方法似乎需要.NET 4.5。

String url = "https://www.stackoverflow.com";
HttpWebRequest request = HttpWebRequest.CreateHttp(url);
request.ServerCertificateValidationCallback += (sender, certificate, chain, sslPolicyErrors) => true;

在.NET 4.0中，Lambda Expression可以像这样应用于全局过滤器

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

Answer 2

由于只有一个全局ServicePointManager，因此设置ServicePointManager.ServerCertificateValidationCallback将产生所有后续请求将继承此策略的结果。因为它是一个全球性的设置＆＃34;它最好在Application_Start中的Global.asax方法中进行设置。

设置回调会覆盖默认行为，您可以自己创建自定义验证例程。

Answer 3

这对我有用：

System.Net.ServicePointManager.ServerCertificateValidationCallback +=
delegate(object sender, System.Security.Cryptography.X509Certificates.X509Certificate certificate,
                        System.Security.Cryptography.X509Certificates.X509Chain chain,
                        System.Net.Security.SslPolicyErrors sslPolicyErrors)
    {
        return true; // **** Always accept
    };

来自此处的代码段：http://www.west-wind.com/weblog/posts/2011/Feb/11/HttpWebRequest-and-Ignoring-SSL-Certificate-Errors

Answer 4

有人提到在.NET 4.5之前访问其ServicePointManager的请求的属性不可用。

这是.NET 4.0代码，可让您基于每个请求访问ServicePoint。它不允许您访问每个请求的回调，但它应该让您找到有关该问题的更多详细信息。只需访问scvPoint.Certificate（或ClientCertificate，如果您愿意）属性。

WebRequest request = WebRequest.Create(uri);

// oddity: these two .Address values are not necessarily the same!
//  The service point appears to be related to the .Host, not the Uri itself.
//  So, check the .Host vlaues before fussing in the debugger.
//
ServicePoint svcPoint = ServicePointManager.FindServicePoint(uri);
if (null != svcPoint)
{
    if (!request.RequestUri.Host.Equals(svcPoint.Address.Host, StringComparison.OrdinalIgnoreCase))
    {
        Debug.WriteLine(".Address              == " + request.RequestUri.ToString());
        Debug.WriteLine(".ServicePoint.Address == " + svcPoint.Address.ToString());
    }
    Debug.WriteLine(".IssuerName           == " + svcPoint.Certificate.GetIssuerName());
}

Answer 5

.net核心

using (var handler = new HttpClientHandler())
{ 
    // allow the bad certificate
    handler.ServerCertificateCustomValidationCallback = (request, cert, chain, errors) => true;
    using (var httpClient = new HttpClient(handler))
    {
        await httpClient.PostAsync("the_url", null);
    }
}

Answer 6

顺便说一下，这是关闭我所知道的给定应用中所有证书验证的最简洁的方法：

$.ajax

Answer 7

根据Adam的回答和Rob的评论，我使用了这个：

ServicePointManager.ServerCertificateValidationCallback += (sender, certificate, chain, sslPolicyErrors) => certificate.Issuer == "CN=localhost";

在某种程度上过滤了“忽略”。当然，可以根据需要添加其他发行人。这是在.NET 2.0中测试的，因为我们需要支持一些遗留代码。

Answer 8

此解决方案的Unity C＃版本：

void Awake()
{
    System.Net.ServicePointManager.ServerCertificateValidationCallback += ValidateCertification;
}

void OnDestroy()
{
    ServerCertificateValidationCallback = null;
}

public static bool ValidateCertification(object sender, X509Certificate certificate, X509Chain chain, System.Net.Security.SslPolicyErrors sslPolicyErrors)
{
    return true;
}

Answer 9

明确表达...

{'BAR': 3, 'BAZ': 3, 'FOO': 3, 'HAM': 3, 'NOM': 1}

Answer 10

添加到Sani和blak3r的答案，我已将以下内容添加到我的应用程序的启动代码中，但在VB中：

'** Overriding the certificate validation check.
Net.ServicePointManager.ServerCertificateValidationCallback = Function(sender, certificate, chain, sslPolicyErrors) True

似乎可以做到这一点。

Answer 11

提示：您还可以使用此方法跟踪即将过期的证书。如果您发现即将过期的证书并且可以及时修复它，这可以节省您的培根。也适用于第三方公司 - 对我们来说这是DHL / FedEx。 DHL只是让一个证书到期，这让我们在感恩节前3天搞砸了。幸运的是我现在正在解决这个问题......这次！

    private static DateTime? _nextCertWarning;
    private static bool ValidateRemoteCertificate(object sender, X509Certificate cert, X509Chain chain, SslPolicyErrors error)
    {
        if (error == SslPolicyErrors.None)
        {
            var cert2 = cert as X509Certificate2;
            if (cert2 != null)
            { 
                // If cert expires within 2 days send an alert every 2 hours
                if (cert2.NotAfter.AddDays(-2) < DateTime.Now)
                {
                    if (_nextCertWarning == null || _nextCertWarning < DateTime.Now)
                    {
                        _nextCertWarning = DateTime.Now.AddHours(2);

                        ProwlUtil.StepReached("CERT EXPIRING WITHIN 2 DAYS " + cert, cert.GetCertHashString());   // this is my own function
                    }
                }
            }

            return true;
        }
        else
        {
            switch (cert.GetCertHashString())
            {
                // Machine certs - SELF SIGNED
                case "066CF9CAD814DE2097D367F22D3A7E398B87C4D6":    

                    return true;

                default:
                    ProwlUtil.StepReached("UNTRUSTED CERT " + cert, cert.GetCertHashString());
                    return false;
            }
        }
    }

Answer 12

上述工作有几个答案。我想要一种不必不断更改代码且不会使我的代码不安全的方法。因此，我创建了一个白名单。白名单可以在任何数据存储中维护。我使用了配置文件，因为它是一个很小的列表。

我的代码在下面。

ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, error) => {
    return error == System.Net.Security.SslPolicyErrors.None || certificateWhitelist.Contains(cert.GetCertHashString());
};

Answer 13

您可以在HttpClient的本地实例上设置回调，而不是向ServicePointManager添加回调以全局覆盖证书验证。这种方法只会影响使用HttpClient实例进行的调用。

这里是示例代码，显示了如何在Web API控制器中实现忽略特定服务器的证书验证错误。

using System.Net.Http;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;

public class MyController : ApiController
{

    // use this HttpClient instance when making calls that need cert errors suppressed
    private static readonly HttpClient httpClient;

    static MyController()
    {
        // create a separate handler for use in this controller
        var handler = new HttpClientHandler();

        // add a custom certificate validation callback to the handler
        handler.ServerCertificateCustomValidationCallback = ((sender, cert, chain, errors) => ValidateCert(sender, cert, chain, errors));

        // create an HttpClient that will use the handler
        httpClient = new HttpClient(handler);
    }

    protected static ValidateCert(object sender, X509Certificate cert, X509Chain chain, SslPolicyErrors errors)
    {

        // set a list of servers for which cert validation errors will be ignored
        var overrideCerts = new string[]
        {
            "myproblemserver",
            "someotherserver",
            "localhost"
        };

        // if the server is in the override list, then ignore any validation errors
        var serverName = cert.Subject.ToLower();
        if (overrideCerts.Any(overrideName => serverName.Contains(overrideName))) return true;

        // otherwise use the standard validation results
        return errors == SslPolicyErrors.None;
    }

}

Answer 14

CA5386：漏洞分析工具将提醒您这些代码。

正确的代码：

ServicePointManager.ServerCertificateValidationCallback += (sender, certificate, chain, sslPolicyErrors) =>
{
   return (sslPolicyErrors & SslPolicyErrors.RemoteCertificateNotAvailable) != SslPolicyErrors.RemoteCertificateNotAvailable;
};

Answer 15

在 .NetCore 3.1 上，您可以通过声明自定义验证方法来解决此问题。

ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

所以在发出请求之前，声明这个回调方法

ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };    
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create("https://someurl.com/service/");  
HttpWebResponse response = (HttpWebResponse)webRequest.GetResponse();

这样，验证将始终通过，因为您的自定义方法始终返回 true 值。

如何在ssl时忽略证书检查

15 个答案: