Question

我正在寻找一种使用VB .Net验证（或绕过验证）自签名SSL证书的方法。我发现代码在C＃中执行此操作并尝试将其转换为VB代码，但我没有运气。

以下是我的尝试：

Imports System
Imports System.Net
Imports System.Security.Cryptography.X509Certificates

Public Class clsSSL
    Public Function AcceptAllCertifications(ByVal sender As Object, ByVal certification As System.Security.Cryptography.X509Certificates.X509Certificate, ByVal chain As System.Security.Cryptography.X509Certificates.X509Chain, ByVal sslPolicyErrors As System.Net.Security.SslPolicyErrors) As Boolean
        Return True
    End Function
End Class

然后在Webrequest之前我有这行代码给我一个错误。

ServicePointManager.ServerCertificateValidationCallback = New System.Net.Security.RemoteCertificateValidationCallback(AcceptAllCertifications)

错误消息是：

Delegate 'System.Net.Security.RemoteCertificateValidationCallback' requires an 'AddressOf' expression or lambda expression as the only argument to its constructor.

Answer 1

在VB.Net中，你需要写

ServicePointManager.ServerCertificateValidationCallback = AddressOf AcceptAllCertifications

Answer 2

一衬垫：

System.Net.ServicePointManager.ServerCertificateValidationCallback = _
  Function(se As Object, _
  cert As System.Security.Cryptography.X509Certificates.X509Certificate, _
  chain As System.Security.Cryptography.X509Certificates.X509Chain, _
  sslerror As System.Net.Security.SslPolicyErrors) True

致Robby Tendean

的信用

Answer 3

我不确定但这应该有效：

ServicePointManager.ServerCertificateValidationCallback = _
      New RemoteCertificateValidationCallback(AddressOf AcceptAllCertifications)

http://msdn.microsoft.com/de-de/library/system.net.security.remotecertificatevalidationcallback%28VS.90%29.aspx

Answer 4

这里所有的答案都盲目接受任何证书。这是一个安全漏洞。

在实施 ServicePointManager.ServerCertificateValidation callback 时，应该验证证书。例如。通过根据已知值检查证书的哈希值：

Imports System.Net
Imports System.Net.Security
Imports System.Security.Cryptography
Imports System.Security.Cryptography.X509Certificates

ServicePointManager.ServerCertificateValidationCallback =
    Function(sender As Object, certificate As X509Certificate, chain As X509Chain,
             errors As SslPolicyErrors)
        Return _
            (errors = SslPolicyErrors.None) Or
            certificate.GetCertHashString(HashAlgorithmName.SHA256).Equals(
                "EB8E0B28AE064ED58CBED9DAEB46CFEB3BD7ECA67737179E3C85BC3CD09D4EEC")
    End Function

对于 X509Certificate.GetCertHashString overload that takes HashAlgorithmName.SHA256，您需要 .NET 4.8。在旧版本上使用 the parameter-less overload 返回一个 SHA-1 哈希值。

基于Is it safe to test the X509Certificate.Thumbprint property when you know an invalid certificate is safe?

对于 C# 版本的代码，请参阅 FtpWebRequest "The remote certificate is invalid according to the validation procedure"。

Answer 5

在VB.Net中，

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls

解决了安全性较低的应用问题。

VB .net接受自签名SSL证书

5 个答案: