Finished implementing AttestationPolicyObserver.

chrome/browser/chromeos/attestation/attestation_policy_observer.cc

 // Copyright (c) 2013 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.
 
 #include "chrome/browser/chromeos/attestation/attestation_policy_observer.h"
 
 #include <string>
 
 #include "base/bind.h"
+#include "base/callback.h"
+#include "base/location.h"
+#include "base/time.h"
 #include "chrome/browser/chromeos/attestation/attestation_ca_client.h"
+#include "chrome/browser/chromeos/attestation/attestation_key_payload.pb.h"
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/policy/cloud/cloud_policy_client.h"
 #include "chrome/browser/policy/cloud/cloud_policy_manager.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chromeos/attestation/attestation_flow.h"
 #include "chromeos/cryptohome/async_method_caller.h"
 #include "chromeos/dbus/cryptohome_client.h"
 #include "chromeos/dbus/dbus_method_call_status.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_details.h"
+#include "net/cert/x509_certificate.h"
 
 namespace {
 
+const char kEnterpriseMachineKey[] = "attest-ent-machine";
+
+// The number of days before a certificate expires during which it is
+// considered 'expiring soon' and replacement is initiated.  The Chrome OS CA
+// issues certificates with an expiry of at least two years.  This value has
+// been set large enough so that the majority of users will have gone through
+// a full sign-in during the period.
+const int kExpiryThresholdInDays = 30;
+
 // A dbus callback which handles a boolean result.
 //
 // Parameters
 //   on_true - Called when status=success and value=true.
 //   on_false - Called when status=success and value=false.
 //   status - The dbus operation status.
 //   value - The value returned by the dbus operation.
 void DBusBoolRedirectCallback(const base::Closure& on_true,
                               const base::Closure& on_false,
+                              const tracked_objects::Location& from_here,
                               chromeos::DBusMethodCallStatus status,
                               bool value) {
-  if (status != chromeos::DBUS_METHOD_CALL_SUCCESS)
+  if (status != chromeos::DBUS_METHOD_CALL_SUCCESS) {
+    LOG(ERROR) << "Cryptohome DBus method failed: " << from_here.ToString()
+               << " - " << status;
     return;
+  }
   const base::Closure& task = value ? on_true : on_false;
   if (!task.is_null())
     task.Run();
 }
 
 // A dbus callback which handles a string result.
 //
 // Parameters
 //   on_success - Called when status=success and result=true.
 //   status - The dbus operation status.
 //   result - The result returned by the dbus operation.
 //   data - The data returned by the dbus operation.
 void DBusStringCallback(
     const base::Callback<void(const std::string&)> on_success,
+    const tracked_objects::Location& from_here,
     chromeos::DBusMethodCallStatus status,
     bool result,
     const std::string& data) {
-  if (status != chromeos::DBUS_METHOD_CALL_SUCCESS || !result)
+  if (status != chromeos::DBUS_METHOD_CALL_SUCCESS || !result) {
+    LOG(ERROR) << "Cryptohome DBus method failed: " << from_here.ToString()
+               << " - " << status << " - " << result;
     return;
+  }
   on_success.Run(data);
 }
 
 }  // namespace
 
 namespace chromeos {
 namespace attestation {
 
-const char AttestationPolicyObserver::kEnterpriseMachineKey[] =
-    "attest-ent-machine";
-
 AttestationPolicyObserver::AttestationPolicyObserver(
     policy::CloudPolicyClient* policy_client)
     : cros_settings_(CrosSettings::Get()),
       policy_client_(policy_client),
       cryptohome_client_(NULL),
       attestation_flow_(NULL),
       ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   cros_settings_->AddSettingsObserver(kDeviceAttestationEnabled, this);
   Start();
@@ skipping 60 matching lines @@
   // Start a dbus call to check if an Enterprise Machine Key already exists.
   base::Closure on_does_exist =
       base::Bind(&AttestationPolicyObserver::GetExistingCertificate,
                  weak_factory_.GetWeakPtr());
   base::Closure on_does_not_exist =
       base::Bind(&AttestationPolicyObserver::GetNewCertificate,
                  weak_factory_.GetWeakPtr());
   cryptohome_client_->TpmAttestationDoesKeyExist(
       CryptohomeClient::DEVICE_KEY,
       kEnterpriseMachineKey,
-      base::Bind(DBusBoolRedirectCallback, on_does_exist, on_does_not_exist));
+      base::Bind(DBusBoolRedirectCallback,
+                 on_does_exist,
+                 on_does_not_exist,
+                 FROM_HERE));
 }
 
 void AttestationPolicyObserver::GetNewCertificate() {
   // We can reuse the dbus callback handler logic.
   attestation_flow_->GetCertificate(
       kEnterpriseMachineKey,
       base::Bind(DBusStringCallback,
                  base::Bind(&AttestationPolicyObserver::UploadCertificate,
                             weak_factory_.GetWeakPtr()),
+                 FROM_HERE,
                  DBUS_METHOD_CALL_SUCCESS));
 }
 
 void AttestationPolicyObserver::GetExistingCertificate() {
   cryptohome_client_->TpmAttestationGetCertificate(
       CryptohomeClient::DEVICE_KEY,
       kEnterpriseMachineKey,
       base::Bind(DBusStringCallback,
                  base::Bind(&AttestationPolicyObserver::CheckCertificateExpiry,
-                            weak_factory_.GetWeakPtr())));
+                            weak_factory_.GetWeakPtr()),
+                 FROM_HERE));
 }
 
 void AttestationPolicyObserver::CheckCertificateExpiry(
     const std::string& certificate) {
-  // TODO(dkrahn): Check if the certificate will expire soon, for now assume no.
-  CheckIfUploaded(certificate);
+  scoped_refptr<net::X509Certificate> x509(
+      net::X509Certificate::CreateFromBytes(certificate.data(),
+                                            certificate.length()));
+  if (!x509.get() || x509->valid_expiry().is_null()) {
+    LOG(WARNING) << "Failed to parse certificate, cannot check expiry.";
+  } else {
+    const base::TimeDelta threshold =
+        base::TimeDelta::FromDays(kExpiryThresholdInDays);
+    if ((base::Time::Now() + threshold) > x509->valid_expiry()) {
+      // The certificate has expired or will soon, replace it.
+      GetNewCertificate();
+      return;
+    }
+  }
+
+  // Get the payload and check if the certificate has already been uploaded.
+  GetKeyPayload(base::Bind(&AttestationPolicyObserver::CheckIfUploaded,
+                           weak_factory_.GetWeakPtr(),
+                           certificate));
 }
 
 void AttestationPolicyObserver::UploadCertificate(
     const std::string& certificate) {
-  // TODO(dkrahn): Upload the certificate.
+  policy_client_->UploadCertificate(
+      certificate,
+      base::Bind(&AttestationPolicyObserver::OnUploadComplete,
+                 weak_factory_.GetWeakPtr()));
 }
 
 void AttestationPolicyObserver::CheckIfUploaded(
-    const std::string& certificate) {
-  // TODO(dkrahn): Check if we've already uploaded the certificate.
+    const std::string& certificate,
+    const std::string& key_payload) {
+  AttestationKeyPayload payload_pb;
+  if (!key_payload.empty() &&
+      payload_pb.ParseFromString(key_payload) &&
+      payload_pb.is_certificate_uploaded()) {
+    // Already uploaded... nothing more to do.
+    return;
+  }
+  UploadCertificate(certificate);
+}
+
+void AttestationPolicyObserver::GetKeyPayload(
+    base::Callback<void(const std::string&)> callback) {
+  cryptohome_client_->TpmAttestationGetKeyPayload(
+      CryptohomeClient::DEVICE_KEY,
+      kEnterpriseMachineKey,
+      base::Bind(DBusStringCallback, callback, FROM_HERE));
+}
+
+void AttestationPolicyObserver::OnUploadComplete(bool status) {
+  if (!status)
+    return;
+  GetKeyPayload(base::Bind(&AttestationPolicyObserver::MarkAsUploaded,
+                           weak_factory_.GetWeakPtr()));
+}
+
+void AttestationPolicyObserver::MarkAsUploaded(const std::string& key_payload) {
+  AttestationKeyPayload payload_pb;
+  if (!key_payload.empty())
+    payload_pb.ParseFromString(key_payload);
+  payload_pb.set_is_certificate_uploaded(true);
+  std::string new_payload;
+  if (!payload_pb.SerializeToString(&new_payload)) {
+    LOG(WARNING) << "Failed to serialize key payload.";
+    return;
+  }
+  cryptohome_client_->TpmAttestationSetKeyPayload(
+      CryptohomeClient::DEVICE_KEY,
+      kEnterpriseMachineKey,
+      new_payload,
+      base::Bind(DBusBoolRedirectCallback,
+                 base::Closure(),
+                 base::Closure(),
+                 FROM_HERE));
 }
 
 }  // namespace attestation
 }  // namespace chromeos