1 /*
2 * Copyright (c) 2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "fscrypt_key_v2.h"
17
18 #include "libfscrypt/key_control.h"
19 #include "storage_service_log.h"
20
21 namespace OHOS {
22 namespace StorageDaemon {
23 #ifdef SUPPORT_FSCRYPT_V2
ActiveKey(uint32_t flag,const std::string & mnt)24 bool FscryptKeyV2::ActiveKey(uint32_t flag, const std::string &mnt)
25 {
26 LOGD("enter");
27 if (keyInfo_.key.IsEmpty()) {
28 LOGE("rawkey is null");
29 return false;
30 }
31
32 auto buf = std::make_unique<char[]>(sizeof(fscrypt_add_key_arg) + FSCRYPT_MAX_KEY_SIZE);
33 auto arg = reinterpret_cast<fscrypt_add_key_arg *>(buf.get());
34 (void)memset_s(arg, sizeof(fscrypt_add_key_arg) + FSCRYPT_MAX_KEY_SIZE, 0, sizeof(fscrypt_add_key_arg) +
35 FSCRYPT_MAX_KEY_SIZE);
36 arg->key_spec.type = FSCRYPT_KEY_SPEC_TYPE_IDENTIFIER;
37 arg->raw_size = keyInfo_.key.size;
38 auto err = memcpy_s(arg->raw, FSCRYPT_MAX_KEY_SIZE, keyInfo_.key.data.get(), keyInfo_.key.size);
39 if (err != EOK) {
40 LOGE("memcpy failed ret %{public}d", err);
41 return false;
42 }
43
44 if (!KeyCtrlInstallKey(mnt.c_str(), arg)) {
45 LOGE("InstallKey failed");
46 return false;
47 }
48 keyInfo_.keyId.Alloc(FSCRYPT_KEY_IDENTIFIER_SIZE);
49 auto ret = memcpy_s(keyInfo_.keyId.data.get(), keyInfo_.keyId.size, arg->key_spec.u.identifier,
50 FSCRYPT_KEY_IDENTIFIER_SIZE);
51 if (ret != EOK) {
52 LOGE("memcpy_s failed ret %{public}d", ret);
53 return false;
54 }
55
56 LOGD("success. key_id len:%{public}d, data(hex):%{private}s", keyInfo_.keyId.size,
57 keyInfo_.keyId.ToString().c_str());
58 if (!SaveKeyBlob(keyInfo_.keyId, dir_ + PATH_KEYID)) {
59 return false;
60 }
61 keyInfo_.key.Clear();
62 LOGD("success");
63 return true;
64 }
65
InactiveKey(uint32_t flag,const std::string & mnt)66 bool FscryptKeyV2::InactiveKey(uint32_t flag, const std::string &mnt)
67 {
68 LOGD("enter");
69 if (keyInfo_.keyId.size != FSCRYPT_KEY_IDENTIFIER_SIZE) {
70 LOGE("keyId is invalid, %{public}u", keyInfo_.keyId.size);
71 return false;
72 }
73
74 fscrypt_remove_key_arg arg;
75 (void)memset_s(&arg, sizeof(arg), 0, sizeof(arg));
76 arg.key_spec.type = FSCRYPT_KEY_SPEC_TYPE_IDENTIFIER;
77 auto ret = memcpy_s(arg.key_spec.u.identifier, FSCRYPT_KEY_IDENTIFIER_SIZE, keyInfo_.keyId.data.get(),
78 keyInfo_.keyId.size);
79 if (ret != EOK) {
80 LOGE("memcpy_s failed ret %{public}d", ret);
81 return false;
82 }
83
84 if (!KeyCtrlRemoveKey(mnt.c_str(), &arg)) {
85 return false;
86 }
87 if (arg.removal_status_flags & FSCRYPT_KEY_REMOVAL_STATUS_FLAG_OTHER_USERS) {
88 LOGE("Other users still have this key added");
89 } else if (arg.removal_status_flags & FSCRYPT_KEY_REMOVAL_STATUS_FLAG_FILES_BUSY) {
90 LOGE("Some files using this key are still in-use");
91 }
92
93 LOGD("success");
94 keyInfo_.keyId.Clear();
95 return true;
96 }
97
98 #else
99 bool FscryptKeyV2::ActiveKey(uint32_t flag, const std::string &mnt)
100 {
101 (void)mnt;
102 (void)flag;
103 LOGI("Unsupported fscrypt v2");
104 return false;
105 }
106
107 bool FscryptKeyV2::InactiveKey(uint32_t flag, const std::string &mnt)
108 {
109 (void)mnt;
110 (void)flag;
111 LOGI("Unsupported fscrypt v2");
112 return false;
113 }
114 #endif
115 } // namespace StorageDaemon
116 } // namespace OHOS
117