Implemented attestation message flow for Chrome OS.

chromeos/attestation/attestation_flow.h

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROMEOS_ATTESTATION_ATTESTATION_FLOW_H_
+#define CHROMEOS_ATTESTATION_ATTESTATION_FLOW_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/callback_forward.h"
+#include "base/memory/weak_ptr.h"
+#include "chromeos/chromeos_export.h"
+#include "chromeos/dbus/dbus_method_call_status.h"
+#include "third_party/cros_system_api/dbus/service_constants.h"
+
+namespace cryptohome {
+
+class AsyncMethodCaller;
+
+}  // namespace cryptohome
+
+namespace chromeos {
+
+class CryptohomeClient;
+
+namespace attestation {
+
+// Interface for access to the Privacy CA server.
+class CHROMEOS_EXPORT ServerProxy {
+ public:
+  typedef base::Callback<void(bool success,
+                              const std::string& data)> DataCallback;
+  virtual ~ServerProxy() {}
+  virtual void SendEnrollRequest(const std::string& request,
+                                 const DataCallback& on_response) = 0;
+  virtual void SendCertificateRequest(const std::string& request,
+                                      const DataCallback& on_response) = 0;
+};
+
+// Implements the message flow for Chrome OS attestation tasks.  Generally this
+// consists of coordinating messages between the Chrome OS attestation service
+// and the Privacy CA server.  Sample usage:
+//    AttestationFlow flow(AsyncMethodCaller::GetInstance(),
+//                         DBusThreadManager::Get().GetCryptohomeClient(),
+//                         my_server_proxy);
+//    CertificateCallback callback = base::Bind(&MyCallback);
+//    flow.GetCertificate("attest-ent-machine", callback);
+class CHROMEOS_EXPORT AttestationFlow {
+ public:
+  typedef base::Callback<void(bool success,
+                              const std::string& pem_certificate_chain)>
+      CertificateCallback;
+
+  AttestationFlow(cryptohome::AsyncMethodCaller* async_caller,
+                  CryptohomeClient* cryptohome_client,
+                  ServerProxy* server_proxy);
+  virtual ~AttestationFlow();
+
+  // Asynchronously gets an attestation certificate bound to the given name.
+  // If no certificate has been associated with the name, a new certificate is
+  // issued.
+  //
+  // Parameters
+  //   name - The name of the key for which to retrieve a certificate.  The
+  //          following key names are available:
+  //            "attest-ent-machine" - The enterprise machine key.
+  //            "attest-ent-user" - An enterprise user key for the current user.
+  //            "content-[origin]" - A content protection key bound to a
+  //                                 specific origin for the current user.
+  //   callback - A callback which will be called when the operation completes.
+  virtual void GetCertificate(const std::string& name,
+                              const CertificateCallback& callback);
+
+ private:
+  // The key name defined for the special-purpose Enterprise Machine Key.
+  static const char kEnterpriseMachineKey[];
+
+  // Asynchronously initiates the attestation enrollment flow.
+  //
+  // Parameters
+  //   on_failure - Called if any failure occurs.
+  //   next_task - Called on successful enrollment.
+  void StartEnroll(const base::Closure& on_failure,
+                   const base::Closure& next_task);
+
+  // Called when the attestation daemon has finished creating an enrollment
+  // request for the Privacy CA.  The request is asynchronously forwarded as-is
+  // to the PCA.
+  //
+  // Parameters
+  //   on_failure - Called if any failure occurs.
+  //   next_task - Called on successful enrollment.
+  //   success - The status of request creation.
+  //   data - The request data for the Privacy CA.
+  void SendEnrollRequestToPCA(const base::Closure& on_failure,
+                              const base::Closure& next_task,
+                              bool success,
+                              const std::string& data);
+
+  // Called when the Privacy CA responds to an enrollment request.  The response
+  // is asynchronously forwarded as-is to the attestation daemon in order to
+  // complete the enrollment operation.
+  //
+  // Parameters
+  //   on_failure - Called if any failure occurs.
+  //   next_task - Called on successful enrollment.
+  //   success - The status of the Privacy CA operation.
+  //   data - The response data from the Privacy CA.
+  void SendEnrollResponseToDaemon(const base::Closure& on_failure,
+                                  const base::Closure& next_task,
+                                  bool success,
+                                  const std::string& data);
+
+  // Called when the attestation daemon completes an enrollment operation.  If
+  // the operation was successful, the next_task callback is called.
+  //
+  // Parameters
+  //   on_failure - Called if any failure occurs.
+  //   next_task - Called on successful enrollment.
+  //   success - The status of the enrollment operation.
+  //   not_used - An artifact of the cryptohome D-Bus interface; ignored.
+  void OnEnrollComplete(const base::Closure& on_failure,
+                        const base::Closure& next_task,
+                        bool success,
+                        cryptohome::MountError not_used);
+
+  // Asynchronously initiates the certificate request flow.  Attestation
+  // enrollment must complete successfully before this operation can succeed.
+  //
+  // Parameters
+  //   name - The name of the key for which a certificate is requested.
+  //   callback - Called when the operation completes.
+  void StartCertificateRequest(const std::string& name,
+                               const CertificateCallback& callback);
+
+  // Called when the attestation daemon has finished creating a certificate
+  // request for the Privacy CA.  The request is asynchronously forwarded as-is
+  // to the PCA.
+  //
+  // Parameters
+  //   callback - Called when the operation completes.
+  //   success - The status of request creation.
+  //   data - The request data for the Privacy CA.
+  void SendCertificateRequestToPCA(const CertificateCallback& callback,
+                                   bool success,
+                                   const std::string& data);
+
+  // Called when the Privacy CA responds to a certificate request.  The response
+  // is asynchronously forwarded as-is to the attestation daemon in order to
+  // complete the operation.
+  //
+  // Parameters
+  //   callback - Called when the operation completes.
+  //   success - The status of the Privacy CA operation.
+  //   data - The response data from the Privacy CA.
+  void SendCertificateResponseToDaemon(const CertificateCallback& callback,
+                                       bool success,
+                                       const std::string& data);
+
+  base::WeakPtrFactory<AttestationFlow> weak_factory_;
+  cryptohome::AsyncMethodCaller* async_caller_;
+  CryptohomeClient* cryptohome_client_;
+  ServerProxy* server_proxy_;
+
+  DISALLOW_COPY_AND_ASSIGN(AttestationFlow);
+};
+
+}  // namespace attestation
+}  // namespace chromeos
+
+#endif  // CHROMEOS_ATTESTATION_ATTESTATION_FLOW_H_