1 /*
2 * Copyright 2020 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 /* BluetoothKeystore Interface */
18
19 #include "btif_keystore.h"
20
21 #include <base/functional/bind.h>
22 #include <base/location.h>
23 #include <base/logging.h>
24 #include <hardware/bluetooth.h>
25
26 #include <map>
27
28 #include "btif_common.h"
29 #include "btif_storage.h"
30 #include "gd/os/parameter_provider.h"
31 #include "main/shim/config.h"
32 #include "main/shim/shim.h"
33
34 using base::Bind;
35 using base::Unretained;
36 using bluetooth::bluetooth_keystore::BluetoothKeystoreCallbacks;
37 using bluetooth::bluetooth_keystore::BluetoothKeystoreInterface;
38
39 namespace bluetooth {
40 namespace bluetooth_keystore {
41 class BluetoothKeystoreInterfaceImpl;
42 std::unique_ptr<BluetoothKeystoreInterface> bluetoothKeystoreInstance;
43 const int CONFIG_COMPARE_ALL_PASS = 0b11;
44
45 class BluetoothKeystoreInterfaceImpl
46 : public bluetooth::bluetooth_keystore::BluetoothKeystoreInterface {
47 ~BluetoothKeystoreInterfaceImpl() override = default;
48
init(BluetoothKeystoreCallbacks * callbacks)49 void init(BluetoothKeystoreCallbacks* callbacks) override {
50 VLOG(2) << __func__;
51 this->callbacks = callbacks;
52
53 bluetooth::os::ParameterProvider::SetCommonCriteriaConfigCompareResult(
54 CONFIG_COMPARE_ALL_PASS);
55 ConvertEncryptOrDecryptKeyIfNeeded();
56 }
57
ConvertEncryptOrDecryptKeyIfNeeded()58 void ConvertEncryptOrDecryptKeyIfNeeded() {
59 VLOG(2) << __func__;
60 if (!callbacks) {
61 LOG(INFO) << __func__ << " callback isn't ready.";
62 return;
63 }
64 do_in_jni_thread(
65 FROM_HERE, base::Bind([]() {
66 shim::BtifConfigInterface::ConvertEncryptOrDecryptKeyIfNeeded();
67 }));
68 }
69
set_encrypt_key_or_remove_key(std::string prefix,std::string decryptedString)70 bool set_encrypt_key_or_remove_key(std::string prefix,
71 std::string decryptedString) override {
72 VLOG(2) << __func__ << " prefix: " << prefix;
73
74 if (!callbacks) {
75 LOG(WARNING) << __func__ << " callback isn't ready. prefix: " << prefix;
76 return false;
77 }
78
79 // Save the value into a map.
80 key_map[prefix] = decryptedString;
81
82 do_in_jni_thread(
83 base::Bind(&bluetooth::bluetooth_keystore::BluetoothKeystoreCallbacks::
84 set_encrypt_key_or_remove_key,
85 base::Unretained(callbacks), prefix, decryptedString));
86 return true;
87 }
88
get_key(std::string prefix)89 std::string get_key(std::string prefix) override {
90 VLOG(2) << __func__ << " prefix: " << prefix;
91
92 if (!callbacks) {
93 LOG(WARNING) << __func__ << " callback isn't ready. prefix: " << prefix;
94 return "";
95 }
96
97 std::string decryptedString;
98 // try to find the key.
99 std::map<std::string, std::string>::iterator iter = key_map.find(prefix);
100 if (iter == key_map.end()) {
101 decryptedString = callbacks->get_key(prefix);
102 // Save the value into a map.
103 key_map[prefix] = decryptedString;
104 VLOG(2) << __func__ << ": get key from bluetoothkeystore.";
105 } else {
106 decryptedString = iter->second;
107 }
108 return decryptedString;
109 }
110
clear_map()111 void clear_map() override {
112 VLOG(2) << __func__;
113
114 std::map<std::string, std::string> empty_map;
115 key_map.swap(empty_map);
116 key_map.clear();
117 }
118
119 private:
120 BluetoothKeystoreCallbacks* callbacks = nullptr;
121 std::map<std::string, std::string> key_map;
122 };
123
getBluetoothKeystoreInterface()124 BluetoothKeystoreInterface* getBluetoothKeystoreInterface() {
125 if (!bluetoothKeystoreInstance) {
126 bluetoothKeystoreInstance.reset(new BluetoothKeystoreInterfaceImpl());
127 }
128
129 return bluetoothKeystoreInstance.get();
130 }
131
132 } // namespace bluetooth_keystore
133 } // namespace bluetooth
134