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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "tpm_password_fetcher.h" | |
| 6 | |
| 7 #include "base/bind.h" | |
| 8 #include "base/compiler_specific.h" | |
| 9 #include "base/message_loop/message_loop.h" | |
| 10 #include "chromeos/dbus/cryptohome_client.h" | |
| 11 #include "chromeos/dbus/dbus_thread_manager.h" | |
| 12 | |
| 13 namespace chromeos { | |
| 14 | |
| 15 namespace { | |
| 16 | |
| 17 // Interval between TPM password checks. | |
| 18 const int kTpmCheckIntervalMs = 500; | |
| 19 | |
| 20 } // namespace | |
| 21 | |
| 22 TpmPasswordFetcher::TpmPasswordFetcher(TpmPasswordFetcherDelegate* delegate) | |
| 23 : delegate_(delegate), weak_factory_(this) { | |
| 24 DCHECK(delegate_); | |
| 25 } | |
| 26 | |
| 27 TpmPasswordFetcher::~TpmPasswordFetcher() { | |
| 28 } | |
| 29 | |
| 30 void TpmPasswordFetcher::Fetch() { | |
| 31 // Since this method is also called directly. | |
| 32 weak_factory_.InvalidateWeakPtrs(); | |
| 33 | |
| 34 DBusThreadManager::Get()->GetCryptohomeClient()->TpmIsReady(base::Bind( | |
| 35 &TpmPasswordFetcher::OnTpmIsReady, weak_factory_.GetWeakPtr())); | |
| 36 } | |
| 37 | |
| 38 void TpmPasswordFetcher::OnTpmIsReady(DBusMethodCallStatus call_status, | |
| 39 bool tpm_is_ready) { | |
| 40 if (call_status == DBUS_METHOD_CALL_SUCCESS && tpm_is_ready) { | |
| 41 DBusThreadManager::Get()->GetCryptohomeClient()->TpmGetPassword(base::Bind( | |
| 42 &TpmPasswordFetcher::OnTpmGetPassword, weak_factory_.GetWeakPtr())); | |
| 43 } else { | |
| 44 // Password hasn't been acquired, reschedule fetch. | |
| 45 RescheduleFetch(); | |
| 46 } | |
| 47 } | |
| 48 | |
| 49 void TpmPasswordFetcher::OnTpmGetPassword(DBusMethodCallStatus call_status, | |
| 50 const std::string& password) { | |
| 51 if (call_status == DBUS_METHOD_CALL_SUCCESS) { | |
| 52 if (password.empty()) { | |
| 53 // For a fresh OOBE flow TPM is uninitialized, | |
| 54 // ownership process is started at the EULA screen, | |
| 55 // password is cleared after EULA is accepted. | |
| 56 LOG(ERROR) << "TPM returned an empty password."; | |
| 57 } | |
| 58 delegate_->OnPasswordFetched(password); | |
| 59 } else { | |
| 60 // Password hasn't been acquired, reschedule fetch. | |
| 61 RescheduleFetch(); | |
| 62 } | |
| 63 } | |
| 64 | |
| 65 void TpmPasswordFetcher::RescheduleFetch() { | |
| 66 base::MessageLoop::current()->PostDelayedTask( | |
| 67 FROM_HERE, | |
| 68 base::Bind(&TpmPasswordFetcher::Fetch, weak_factory_.GetWeakPtr()), | |
| 69 base::TimeDelta::FromMilliseconds(kTpmCheckIntervalMs)); | |
| 70 } | |
| 71 | |
| 72 } // namespace chromeos | |
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