1 // Copyright (c) 2012 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 "chromeos/cryptohome/system_salt_getter.h"
6
7 #include "base/bind.h"
8 #include "base/location.h"
9 #include "base/message_loop/message_loop_proxy.h"
10 #include "base/strings/string_number_conversions.h"
11 #include "base/strings/string_util.h"
12 #include "chromeos/dbus/cryptohome_client.h"
13 #include "chromeos/dbus/dbus_thread_manager.h"
14
15 namespace chromeos {
16 namespace {
17
18 SystemSaltGetter* g_system_salt_getter = NULL;
19
20 } // namespace
21
SystemSaltGetter()22 SystemSaltGetter::SystemSaltGetter() : weak_ptr_factory_(this) {
23 }
24
~SystemSaltGetter()25 SystemSaltGetter::~SystemSaltGetter() {
26 }
27
GetSystemSalt(const GetSystemSaltCallback & callback)28 void SystemSaltGetter::GetSystemSalt(
29 const GetSystemSaltCallback& callback) {
30 if (!system_salt_.empty()) {
31 base::MessageLoopProxy::current()->PostTask(
32 FROM_HERE, base::Bind(callback, system_salt_));
33 return;
34 }
35
36 DBusThreadManager::Get()->GetCryptohomeClient()->WaitForServiceToBeAvailable(
37 base::Bind(&SystemSaltGetter::DidWaitForServiceToBeAvailable,
38 weak_ptr_factory_.GetWeakPtr(),
39 callback));
40 }
41
DidWaitForServiceToBeAvailable(const GetSystemSaltCallback & callback,bool service_is_available)42 void SystemSaltGetter::DidWaitForServiceToBeAvailable(
43 const GetSystemSaltCallback& callback,
44 bool service_is_available) {
45 if (!service_is_available) {
46 LOG(ERROR) << "WaitForServiceToBeAvailable failed.";
47 callback.Run(std::string());
48 return;
49 }
50 DBusThreadManager::Get()->GetCryptohomeClient()->GetSystemSalt(
51 base::Bind(&SystemSaltGetter::DidGetSystemSalt,
52 weak_ptr_factory_.GetWeakPtr(),
53 callback));
54 }
55
DidGetSystemSalt(const GetSystemSaltCallback & callback,DBusMethodCallStatus call_status,const std::vector<uint8> & system_salt)56 void SystemSaltGetter::DidGetSystemSalt(const GetSystemSaltCallback& callback,
57 DBusMethodCallStatus call_status,
58 const std::vector<uint8>& system_salt) {
59 if (call_status == DBUS_METHOD_CALL_SUCCESS &&
60 !system_salt.empty() &&
61 system_salt.size() % 2 == 0U)
62 system_salt_ = ConvertRawSaltToHexString(system_salt);
63 else
64 LOG(WARNING) << "System salt not available";
65
66 callback.Run(system_salt_);
67 }
68
69 // static
Initialize()70 void SystemSaltGetter::Initialize() {
71 CHECK(!g_system_salt_getter);
72 g_system_salt_getter = new SystemSaltGetter();
73 }
74
75 // static
IsInitialized()76 bool SystemSaltGetter::IsInitialized() {
77 return g_system_salt_getter;
78 }
79
80 // static
Shutdown()81 void SystemSaltGetter::Shutdown() {
82 CHECK(g_system_salt_getter);
83 delete g_system_salt_getter;
84 g_system_salt_getter = NULL;
85 }
86
87 // static
Get()88 SystemSaltGetter* SystemSaltGetter::Get() {
89 CHECK(g_system_salt_getter)
90 << "SystemSaltGetter::Get() called before Initialize()";
91 return g_system_salt_getter;
92 }
93
94 // static
ConvertRawSaltToHexString(const std::vector<uint8> & salt)95 std::string SystemSaltGetter::ConvertRawSaltToHexString(
96 const std::vector<uint8>& salt) {
97 return base::StringToLowerASCII(base::HexEncode(
98 reinterpret_cast<const void*>(salt.data()), salt.size()));
99 }
100
101 } // namespace chromeos
102