1 /*
2 * Copyright (c) 2024 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 "fileshare_fuzzer.h"
17
18 #include <cstddef>
19 #include <cstdint>
20
21 #include "file_permission.h"
22 #include "accesstoken_kit.h"
23 #include "nativetoken_kit.h"
24 #include "token_setproc.h"
25
26 namespace OHOS {
27 constexpr size_t LENGTH = 4;
28 constexpr size_t REMAINDER = 3;
29 using namespace OHOS::Security::AccessToken;
30
ConvertToUint32(const uint8_t * ptr,size_t size)31 uint32_t ConvertToUint32(const uint8_t *ptr, size_t size)
32 {
33 if (ptr == nullptr || (size < sizeof(uint32_t))) {
34 return 0;
35 }
36 return *(reinterpret_cast<const uint32_t *>(ptr));
37 }
38
GetInfo(const uint8_t * data,size_t size,std::vector<OHOS::AppFileService::UriPolicyInfo> & info)39 void GetInfo(const uint8_t *data, size_t size, std::vector<OHOS::AppFileService::UriPolicyInfo> &info)
40 {
41 OHOS::AppFileService::UriPolicyInfo policyInfo;
42 size_t lenth = size - LENGTH;
43 std::string uri(reinterpret_cast<const char *>(data), lenth);
44 policyInfo.uri = uri;
45 policyInfo.mode = ConvertToUint32(data + lenth, LENGTH) % REMAINDER;
46 info.push_back(policyInfo);
47 }
48
GrantNativePermission()49 void GrantNativePermission()
50 {
51 const char **perms = new const char *[1];
52 perms[0] = "ohos.permission.FILE_ACCESS_PERSIST";
53 TokenInfoParams infoInstance = {
54 .dcapsNum = 0,
55 .permsNum = 1,
56 .aclsNum = 0,
57 .dcaps = nullptr,
58 .perms = perms,
59 .acls = nullptr,
60 .processName = "app_file_service",
61 .aplStr = "system_core",
62 };
63 uint64_t tokenId = GetAccessTokenId(&infoInstance);
64 SetSelfTokenID(tokenId);
65 AccessTokenKit::ReloadNativeTokenInfo();
66 delete[] perms;
67 }
68
PersistPermissionFuzzTest(const uint8_t * data,size_t size)69 void PersistPermissionFuzzTest(const uint8_t *data, size_t size)
70 {
71 if (size < LENGTH) {
72 return;
73 }
74 std::deque<OHOS::AppFileService::PolicyErrorResult> result;
75 std::vector<OHOS::AppFileService::UriPolicyInfo> info;
76 GetInfo(data, size, info);
77 GrantNativePermission();
78 OHOS::AppFileService::FilePermission::PersistPermission(info, result);
79 }
80
RevokePermissionFuzzTest(const uint8_t * data,size_t size)81 void RevokePermissionFuzzTest(const uint8_t *data, size_t size)
82 {
83 if (size < LENGTH) {
84 return;
85 }
86 std::deque<OHOS::AppFileService::PolicyErrorResult> result;
87 std::vector<OHOS::AppFileService::UriPolicyInfo> info;
88 GetInfo(data, size, info);
89 GrantNativePermission();
90 OHOS::AppFileService::FilePermission::RevokePermission(info, result);
91 }
92
ActivatePermissionFuzzTest(const uint8_t * data,size_t size)93 void ActivatePermissionFuzzTest(const uint8_t *data, size_t size)
94 {
95 if (size < LENGTH) {
96 return;
97 }
98 std::deque<OHOS::AppFileService::PolicyErrorResult> result;
99 std::vector<OHOS::AppFileService::UriPolicyInfo> info;
100 GetInfo(data, size, info);
101 GrantNativePermission();
102 OHOS::AppFileService::FilePermission::ActivatePermission(info, result);
103 }
104
DeactivatePermissionFuzzTest(const uint8_t * data,size_t size)105 void DeactivatePermissionFuzzTest(const uint8_t *data, size_t size)
106 {
107 if (size < LENGTH) {
108 return;
109 }
110 std::deque<OHOS::AppFileService::PolicyErrorResult> result;
111 std::vector<OHOS::AppFileService::UriPolicyInfo> info;
112 GetInfo(data, size, info);
113 GrantNativePermission();
114 OHOS::AppFileService::FilePermission::DeactivatePermission(info, result);
115 }
116
117 /* Fuzzer entry point */
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)118 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
119 {
120 /* Run your code on data */
121 OHOS::PersistPermissionFuzzTest(data, size);
122 OHOS::RevokePermissionFuzzTest(data, size);
123 OHOS::ActivatePermissionFuzzTest(data, size);
124 OHOS::DeactivatePermissionFuzzTest(data, size);
125 return 0;
126 }
127 }
128