// Populates the client certificate. The result may be null if there is no client cert.
// TODO: Does it make sense for this to be invoked multiple times (e.g. renegotiate)? Client and server code appear to
// enable this, but it's unclear what Http.Sys would do.
public async Task <X509Certificate2> GetClientCertificateAsync(CancellationToken cancellationToken = default(CancellationToken))
{
if (SslStatus == SslStatus.Insecure)
{
// Non-SSL
return(null);
}
// TODO: Verbose log
if (_clientCert != null)
{
return(_clientCert);
}
cancellationToken.ThrowIfCancellationRequested();
ClientCertLoader certLoader = new ClientCertLoader(RequestContext, cancellationToken);
try
{
await certLoader.LoadClientCertificateAsync().SupressContext();
// Populate the environment.
if (certLoader.ClientCert != null)
{
_clientCert = certLoader.ClientCert;
}
// TODO: Expose errors and exceptions?
}
catch (Exception)
{
if (certLoader != null)
{
certLoader.Dispose();
}
throw;
}
return(_clientCert);
}
private static unsafe void IOCompleted(ClientCertLoader asyncResult, uint errorCode, uint numBytes)
{
RequestContext requestContext = asyncResult.RequestContext;
try
{
if (errorCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_MORE_DATA)
{
// There is a bug that has existed in http.sys since w2k3. Bytesreceived will only
// return the size of the initial cert structure. To get the full size,
// we need to add the certificate encoding size as well.
UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO *pClientCertInfo = asyncResult.RequestBlob;
asyncResult.Reset(numBytes + pClientCertInfo->CertEncodedSize);
uint bytesReceived = 0;
errorCode =
UnsafeNclNativeMethods.HttpApi.HttpReceiveClientCertificate(
requestContext.RequestQueueHandle,
requestContext.Request.ConnectionId,
(uint)UnsafeNclNativeMethods.HttpApi.HTTP_FLAGS.NONE,
asyncResult._memoryBlob,
asyncResult._size,
&bytesReceived,
asyncResult._overlapped);
if (errorCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_IO_PENDING ||
(errorCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS && !WebListener.SkipIOCPCallbackOnSuccess))
{
return;
}
}
if (errorCode == UnsafeNclNativeMethods.ErrorCodes.ERROR_NOT_FOUND)
{
// The client did not send a cert.
asyncResult.Complete(0, null);
}
else if (errorCode != UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS)
{
asyncResult.Fail(new WebListenerException((int)errorCode));
}
else
{
UnsafeNclNativeMethods.HttpApi.HTTP_SSL_CLIENT_CERT_INFO *pClientCertInfo = asyncResult._memoryBlob;
if (pClientCertInfo == null)
{
asyncResult.Complete(0, null);
}
else
{
if (pClientCertInfo->pCertEncoded != null)
{
try
{
byte[] certEncoded = new byte[pClientCertInfo->CertEncodedSize];
Marshal.Copy((IntPtr)pClientCertInfo->pCertEncoded, certEncoded, 0, certEncoded.Length);
asyncResult.Complete((int)pClientCertInfo->CertFlags, new X509Certificate2(certEncoded));
}
catch (CryptographicException exception)
{
// TODO: Log
asyncResult.Fail(exception);
}
catch (SecurityException exception)
{
// TODO: Log
asyncResult.Fail(exception);
}
}
}
}
}
catch (Exception exception)
{
asyncResult.Fail(exception);
}
}