LocalCertificateSelectionCallback Delegado

Definición

Espacio de nombres:

System.Net.Security

Ensamblado:

System.Net.Security.dll

Selecciona el certificado SSL (Secure Sockets Layer) local que se utiliza para la autenticación.

public delegate System::Security::Cryptography::X509Certificates::X509Certificate ^ LocalCertificateSelectionCallback(System::Object ^ sender, System::String ^ targetHost, X509CertificateCollection ^ localCertificates, X509Certificate ^ remoteCertificate, cli::array <System::String ^> ^ acceptableIssuers);

public delegate System.Security.Cryptography.X509Certificates.X509Certificate LocalCertificateSelectionCallback(object sender, string targetHost, X509CertificateCollection localCertificates, X509Certificate? remoteCertificate, string[] acceptableIssuers);

type LocalCertificateSelectionCallback = delegate of obj * string * X509CertificateCollection * X509Certificate * string[] -> X509Certificate

Public Delegate Function LocalCertificateSelectionCallback(sender As Object, targetHost As String, localCertificates As X509CertificateCollection, remoteCertificate As X509Certificate, acceptableIssuers As String()) As X509Certificate 

Parámetros

sender

Object

Objeto que contiene información de estado para esta validación.

targetHost

String

Servidor host especificado por el cliente.

localCertificates

X509CertificateCollection

X509CertificateCollection que contiene los certificados locales.

remoteCertificate

X509Certificate

Certificado utilizado para autenticar la parte remota.

acceptableIssuers

String[]

Matriz de String de emisores de certificados aceptables para la parte remota.

Valor devuelto

X509Certificate

X509Certificate utilizado para establecer una conexión SSL.

Ejemplos

En el ejemplo de código siguiente se muestra una implementación de método para este delegado.

static X509Certificate^ SelectLocalCertificate(
        Object^ sender, 
        String^ targetHost, 
        X509CertificateCollection^ localCertificates, 
        X509Certificate^ remoteCertificate, 
        array<String^>^ acceptableIssuers
)
{	
    Console::WriteLine("Client is selecting a local certificate.");
    if (acceptableIssuers != nullptr && 
            acceptableIssuers->Length > 0 &&
            localCertificates != nullptr &&
            localCertificates->Count > 0)
    {
        // Use the first certificate that is from an acceptable issuer.
        IEnumerator^ myEnum1 = localCertificates->GetEnumerator();
        while ( myEnum1->MoveNext() )
        {
            X509Certificate^ certificate = safe_cast<X509Certificate^>(myEnum1->Current);
            String^ issuer = certificate->Issuer;
            if ( Array::IndexOf( acceptableIssuers, issuer ) != -1 )
                return certificate;
        }
    }
    if (localCertificates != nullptr &&
            localCertificates->Count > 0)
        return localCertificates[0];
            
    return nullptr;
 }

public static X509Certificate SelectLocalCertificate(
    object sender,
    string targetHost,
    X509CertificateCollection localCertificates,
    X509Certificate remoteCertificate,
    string[] acceptableIssuers)
{	
    Console.WriteLine("Client is selecting a local certificate.");
    if (acceptableIssuers != null &&
        acceptableIssuers.Length > 0 &&
        localCertificates != null &&
        localCertificates.Count > 0)
    {
        // Use the first certificate that is from an acceptable issuer.
        foreach (X509Certificate certificate in localCertificates)
        {
            string issuer = certificate.Issuer;
            if (Array.IndexOf(acceptableIssuers, issuer) != -1)
                return certificate;
        }
    }
    if (localCertificates != null &&
        localCertificates.Count > 0)
        return localCertificates[0];

    return null;
}

En el ejemplo de código siguiente se muestra cómo crear una instancia de este delegado.

// Server name must match the host name and the name on the host's certificate. 
serverName = args[ 1 ];

// Create a TCP/IP client socket.
TcpClient^ client = gcnew TcpClient( serverName,5000 );
Console::WriteLine( L"Client connected." );

// Create an SSL stream that will close the client's stream.
SslStream^ sslStream = gcnew SslStream( 
    client->GetStream(),
    false,
    gcnew RemoteCertificateValidationCallback( ValidateServerCertificate ),
    gcnew LocalCertificateSelectionCallback( SelectLocalCertificate ) );

// Server name must match the host name and the name on the host's certificate.
serverName = args[0];
// Create a TCP/IP client socket.
TcpClient client = new TcpClient(serverName,5000);
Console.WriteLine("Client connected.");
// Create an SSL stream that will close the client's stream.
SslStream sslStream = new SslStream(
    client.GetStream(),
    false,
    new RemoteCertificateValidationCallback (ValidateServerCertificate),
    new LocalCertificateSelectionCallback(SelectLocalCertificate)
    );

Comentarios

Este delegado se usa para construir instancias de la SslStream clase . La SslStream clase se usa para ayudar a proteger la información intercambiada entre un cliente y un servidor. El cliente y el servidor usan este delegado para seleccionar un certificado que se usará para la autenticación.

Métodos de extensión

GetMethodInfo(Delegate)

Obtiene un objeto que representa el método representado por el delegado especificado.

Consulte también

• RemoteCertificateValidationCallback