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 <bluetooth/log.h>
24 #include <hardware/bluetooth.h>
25
26 #include <map>
27
28 #include "btif_common.h"
29 #include "btif_storage.h"
30 #include "main/shim/config.h"
31 #include "main/shim/shim.h"
32 #include "os/parameter_provider.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 log::verbose("");
51 this->callbacks = callbacks;
52
53 bluetooth::os::ParameterProvider::SetCommonCriteriaConfigCompareResult(
54 CONFIG_COMPARE_ALL_PASS);
55 ConvertEncryptOrDecryptKeyIfNeeded();
56 }
57
ConvertEncryptOrDecryptKeyIfNeeded()58 void ConvertEncryptOrDecryptKeyIfNeeded() {
59 log::verbose("");
60 if (!callbacks) {
61 log::info("callback isn't ready.");
62 return;
63 }
64 do_in_jni_thread(base::BindOnce([]() {
65 shim::BtifConfigInterface::ConvertEncryptOrDecryptKeyIfNeeded();
66 }));
67 }
68
set_encrypt_key_or_remove_key(std::string prefix,std::string decryptedString)69 bool set_encrypt_key_or_remove_key(std::string prefix,
70 std::string decryptedString) override {
71 log::verbose("prefix: {}", prefix);
72
73 if (!callbacks) {
74 log::warn("callback isn't ready. prefix: {}", prefix);
75 return false;
76 }
77
78 // Save the value into a map.
79 key_map[prefix] = decryptedString;
80
81 do_in_jni_thread(base::BindOnce(
82 &bluetooth::bluetooth_keystore::BluetoothKeystoreCallbacks::
83 set_encrypt_key_or_remove_key,
84 base::Unretained(callbacks), prefix, decryptedString));
85 return true;
86 }
87
get_key(std::string prefix)88 std::string get_key(std::string prefix) override {
89 log::verbose("prefix: {}", prefix);
90
91 if (!callbacks) {
92 log::warn("callback isn't ready. prefix: {}", prefix);
93 return "";
94 }
95
96 std::string decryptedString;
97 // try to find the key.
98 std::map<std::string, std::string>::iterator iter = key_map.find(prefix);
99 if (iter == key_map.end()) {
100 decryptedString = callbacks->get_key(prefix);
101 // Save the value into a map.
102 key_map[prefix] = decryptedString;
103 log::verbose("get key from bluetoothkeystore.");
104 } else {
105 decryptedString = iter->second;
106 }
107 return decryptedString;
108 }
109
clear_map()110 void clear_map() override {
111 log::verbose("");
112
113 std::map<std::string, std::string> empty_map;
114 key_map.swap(empty_map);
115 key_map.clear();
116 }
117
118 private:
119 BluetoothKeystoreCallbacks* callbacks = nullptr;
120 std::map<std::string, std::string> key_map;
121 };
122
getBluetoothKeystoreInterface()123 BluetoothKeystoreInterface* getBluetoothKeystoreInterface() {
124 if (!bluetoothKeystoreInstance) {
125 bluetoothKeystoreInstance.reset(new BluetoothKeystoreInterfaceImpl());
126 }
127
128 return bluetoothKeystoreInstance.get();
129 }
130
131 } // namespace bluetooth_keystore
132 } // namespace bluetooth
133