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1 /*
2  * Copyright (C) 2021 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 "telephony_permission.h"
17 
18 #include "accesstoken_kit.h"
19 #include "bundle_mgr_interface.h"
20 #include "if_system_ability_manager.h"
21 #include "ipc_skeleton.h"
22 #include "iservice_registry.h"
23 #include "privacy_kit.h"
24 #include "system_ability_definition.h"
25 #include "telephony_log_wrapper.h"
26 #include "tokenid_kit.h"
27 
28 namespace OHOS {
29 namespace Telephony {
30 using namespace Security::AccessToken;
31 
32 /**
33  * @brief Get bundleName by callingUid.
34  * @param callingUid.
35  * @param bundleName.
36  * @return Returns true on success, false on failure.
37  */
GetBundleNameByUid(int32_t uid,std::string & bundleName)38 bool TelephonyPermission::GetBundleNameByUid(int32_t uid, std::string &bundleName)
39 {
40     OHOS::sptr<OHOS::ISystemAbilityManager> systemAbilityManager =
41         OHOS::SystemAbilityManagerClient::GetInstance().GetSystemAbilityManager();
42     OHOS::sptr<OHOS::IRemoteObject> remoteObject =
43         systemAbilityManager->GetSystemAbility(BUNDLE_MGR_SERVICE_SYS_ABILITY_ID);
44 
45     sptr<AppExecFwk::IBundleMgr> iBundleMgr = OHOS::iface_cast<AppExecFwk::IBundleMgr>(remoteObject);
46     if (iBundleMgr == nullptr) {
47         return false;
48     }
49     std::string identity = IPCSkeleton::ResetCallingIdentity();
50     ErrCode errCode = iBundleMgr->GetNameForUid(uid, bundleName);
51     IPCSkeleton::SetCallingIdentity(identity);
52     if (errCode != ERR_OK) {
53         TELEPHONY_LOGE("get name for uid failed, error code : %{public}d", errCode);
54         return false;
55     }
56     return true;
57 }
58 
59 /**
60  * @brief Permission check by callingUid.
61  * @param permissionName permission name.
62  * @return Returns true on success, false on failure.
63  */
CheckPermission(const std::string & permissionName)64 bool TelephonyPermission::CheckPermission(const std::string &permissionName)
65 {
66     if (permissionName.empty()) {
67         TELEPHONY_LOGD("permission check failed, permission name is empty.");
68         return false;
69     }
70 
71     auto callerToken = IPCSkeleton::GetCallingTokenID();
72     auto tokenType = AccessTokenKit::GetTokenTypeFlag(callerToken);
73     int result = AccessTokenKit::VerifyAccessToken(callerToken, permissionName);
74 
75     if (permissionName == Permission::ANSWER_CALL || permissionName == Permission::READ_CALL_LOG
76         || permissionName == Permission::READ_CONTACTS || permissionName == Permission::WRITE_CONTACTS
77         || permissionName == Permission::SEND_MESSAGES) {
78         if (tokenType == ATokenTypeEnum::TOKEN_HAP) {
79             bool status = result == PermissionState::PERMISSION_GRANTED;
80             int32_t successCount = status ? 1 : 0;
81             int32_t failCount = status ? 0 : 1;
82             int32_t ret = PrivacyKit::AddPermissionUsedRecord(callerToken, permissionName, successCount, failCount);
83             if (ret != 0) {
84                 TELEPHONY_LOGD("AddPermissionUsedRecord failed, permission:%{public}s, "
85                                "successCount:%{public}d, failCount:%{public}d",
86                     permissionName.c_str(), successCount, failCount);
87             }
88         }
89     }
90 
91     if (result != PermissionState::PERMISSION_GRANTED) {
92         TELEPHONY_LOGD("permission check failed, permission:%{public}s, callerToken:%{public}u, tokenType:%{public}d",
93             permissionName.c_str(), callerToken, tokenType);
94         return false;
95     }
96     return true;
97 }
98 
CheckCallerIsSystemApp()99 bool TelephonyPermission::CheckCallerIsSystemApp()
100 {
101     auto callerToken = IPCSkeleton::GetCallingTokenID();
102     auto tokenType = AccessTokenKit::GetTokenTypeFlag(callerToken);
103     if (tokenType == Security::AccessToken::ATokenTypeEnum::TOKEN_NATIVE ||
104         tokenType == Security::AccessToken::ATokenTypeEnum::TOKEN_SHELL) {
105         TELEPHONY_LOGI("tokenType check passed.");
106         return true;
107     }
108 
109     auto selfToken = IPCSkeleton::GetCallingFullTokenID();
110     return Security::AccessToken::TokenIdKit::IsSystemAppByFullTokenID(selfToken);
111 }
112 } // namespace Telephony
113 } // namespace OHOS
114