How can you add a Certificate to WebClient (C#)?
I know it is pretty simple to add a certificate to a HttpWebRequest. Howe开发者_JAVA百科ver, I have not found a way to do the equivalent using WebClient. Basically, I want to send out a POST with a specific certificate using WebClient.
How would you accomplish this exact code using WebClient:
var request = (HttpWebRequest) WebRequest.Create("my-url");
request.Method = "POST";
request.ClientCertificates.Add(new X509Certificate()); //add cert
You must subclass and override one or more functions.
class MyWebClient : WebClient
{
protected override WebRequest GetWebRequest(Uri address)
{
HttpWebRequest request = (HttpWebRequest)base.GetWebRequest(address);
request.ClientCertificates.Add(new X509Certificate());
return request;
}
}
public class CertificateWebClient : WebClient
{
private readonly X509Certificate2 certificate;
public CertificateWebClient(X509Certificate2 cert)
{
certificate = cert;
}
protected override WebRequest GetWebRequest(Uri address)
{
HttpWebRequest request = (HttpWebRequest)base.GetWebRequest(address);
System.Net.ServicePointManager.ServerCertificateValidationCallback = delegate(Object obj, X509Certificate X509certificate, X509Chain chain, System.Net.Security.SslPolicyErrors errors)
{
return true;
};
request.ClientCertificates.Add(certificate);
return request;
}
}
Now you can with self signed cert ! ("The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.; The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.;")
X509Certificate2 Cert = new X509Certificate2("client.p12", "1234", X509KeyStorageFlags.MachineKeySet);
// Create a new WebClient instance.
CertificateWebClient myWebClient = new CertificateWebClient(Cert);
string fileName = Installation.destXML;
string uriString = "https://xxxxxxx.xx:918";
// Upload the file to the URI.
// The 'UploadFile(uriString,fileName)' method implicitly uses HTTP POST method.
byte[] responseArray = myWebClient.UploadFile(uriString, fileName);
// Decode and display the response.
Console.WriteLine("\nResponse Received.The contents of the file uploaded are:\n{0}",
System.Text.Encoding.ASCII.GetString(responseArray));
An interesting thing happened when a new certificate was installed on our front-ends. We started getting the error:
"The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.; The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.;"
We took care of the error by going to each front-end and opening the browser. It seems that IE was caching the old certificate. By opening the browsers, the new certificate took effect. Problem Solved!
Just subclass WebClient
, add your own ClientCertificates
property and override the WebClient.GetWebRequest(System.Uri)
method. I don't have time to convert this to C# from VB but it should be fairly self-explanatory:
Imports System.Net
Public Class WebClient2
Inherits System.Net.WebClient
Private _ClientCertificates As New System.Security.Cryptography.X509Certificates.X509CertificateCollection
Public ReadOnly Property ClientCertificates() As System.Security.Cryptography.X509Certificates.X509CertificateCollection
Get
Return Me._ClientCertificates
End Get
End Property
Protected Overrides Function GetWebRequest(ByVal address As System.Uri) As System.Net.WebRequest
Dim R = MyBase.GetWebRequest(address)
If TypeOf R Is HttpWebRequest Then
Dim WR = DirectCast(R, HttpWebRequest)
If Me._ClientCertificates IsNot Nothing AndAlso Me._ClientCertificates.Count > 0 Then
WR.ClientCertificates.AddRange(Me._ClientCertificates)
End If
End If
Return R
End Function
End Class
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