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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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