Proteggere le comunicazioni basate su WCF per un servizio

La sicurezza è uno degli aspetti essenziali della comunicazione. Il framework di applicazioni di Reliable Services offre alcuni stack e strumenti predefiniti che è possibile usare per migliorare la sicurezza. Questo articolo illustra come migliorare la sicurezza quando si usa la comunicazione remota per un servizio.

Verrà usato un esempio esistente che spiega come configurare uno stack di comunicazione basato su WCF per Reliable Services. Per proteggere un sevizio quando si usa uno stack di comunicazione basato su WCF, seguire questa procedura:

1. Per il servizio, è necessario proteggere il listener di comunicazione WCF (WcfCommunicationListener) che viene creato. A tale scopo, modificare il metodo CreateServiceReplicaListeners .

   protected override IEnumerable<ServiceReplicaListener> CreateServiceReplicaListeners()
   {
       return new[]
       {
           new ServiceReplicaListener(
               this.CreateWcfCommunicationListener)
       };
   }
   
   private WcfCommunicationListener<ICalculator> CreateWcfCommunicationListener(StatefulServiceContext context)
   {
      var wcfCommunicationListener = new WcfCommunicationListener<ICalculator>(
           serviceContext:context,
           wcfServiceObject:this,
           // For this example, we will be using NetTcpBinding.
           listenerBinding: GetNetTcpBinding(),
           endpointResourceName:"WcfServiceEndpoint");
   
       // Add certificate details in the ServiceHost credentials.
       wcfCommunicationListener.ServiceHost.Credentials.ServiceCertificate.SetCertificate(
           StoreLocation.LocalMachine,
           StoreName.My,
           X509FindType.FindByThumbprint,
           "9DC906B169DC4FAFFD1697AC781E806790749D2F");
       return wcfCommunicationListener;
   }
   
   private static NetTcpBinding GetNetTcpBinding()
   {
       NetTcpBinding b = new NetTcpBinding(SecurityMode.TransportWithMessageCredential);
       b.Security.Message.ClientCredentialType = MessageCredentialType.Certificate;
       return b;
   }
   

2. Nel client la classe WcfCommunicationClient creata nell' esempio precedente rimane invariata. È però necessario eseguire l'override del metodo CreateClientAsync di WcfCommunicationClientFactory:

   public class SecureWcfCommunicationClientFactory<TServiceContract> : WcfCommunicationClientFactory<TServiceContract> where TServiceContract : class
   {
       private readonly Binding clientBinding;
       private readonly object callbackObject;
       public SecureWcfCommunicationClientFactory(
           Binding clientBinding,
           IEnumerable<IExceptionHandler> exceptionHandlers = null,
           IServicePartitionResolver servicePartitionResolver = null,
           string traceId = null,
           object callback = null)
           : base(clientBinding, exceptionHandlers, servicePartitionResolver,traceId,callback)
       {
           this.clientBinding = clientBinding;
           this.callbackObject = callback;
       }
   
       protected override Task<WcfCommunicationClient<TServiceContract>> CreateClientAsync(string endpoint, CancellationToken cancellationToken)
       {
           var endpointAddress = new EndpointAddress(new Uri(endpoint));
           ChannelFactory<TServiceContract> channelFactory;
           if (this.callbackObject != null)
           {
               channelFactory = new DuplexChannelFactory<TServiceContract>(
               this.callbackObject,
               this.clientBinding,
               endpointAddress);
           }
           else
           {
               channelFactory = new ChannelFactory<TServiceContract>(this.clientBinding, endpointAddress);
           }
           // Add certificate details to the ChannelFactory credentials.
           // These credentials will be used by the clients created by
           // SecureWcfCommunicationClientFactory.  
           channelFactory.Credentials.ClientCertificate.SetCertificate(
               StoreLocation.LocalMachine,
               StoreName.My,
               X509FindType.FindByThumbprint,
               "9DC906B169DC4FAFFD1697AC781E806790749D2F");
           var channel = channelFactory.CreateChannel();
           var clientChannel = ((IClientChannel)channel);
           clientChannel.OperationTimeout = this.clientBinding.ReceiveTimeout;
           return Task.FromResult(this.CreateWcfCommunicationClient(channel));
       }
   }
   

   Usare il metodo SecureWcfCommunicationClientFactory per creare un client di comunicazione WCF (WcfCommunicationClient). Usare il client per richiamare i metodi del servizio.

   IServicePartitionResolver partitionResolver = ServicePartitionResolver.GetDefault();
   
   var wcfClientFactory = new SecureWcfCommunicationClientFactory<ICalculator>(clientBinding: GetNetTcpBinding(), servicePartitionResolver: partitionResolver);
   
   var calculatorServiceCommunicationClient =  new WcfCommunicationClient(
       wcfClientFactory,
       ServiceUri,
       ServicePartitionKey.Singleton);
   
   var result = calculatorServiceCommunicationClient.InvokeWithRetryAsync(
       client => client.Channel.Add(2, 3)).Result;
   

Come passaggio successivo, vedere API Web con OWIN in Reliable Services.