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 "accessibilityconfig_fuzzer.h"
17 #include "accessibility_config.h"
18 #include "accesstoken_kit.h"
19 #include "nativetoken_kit.h"
20 #include "securec.h"
21 #include "token_setproc.h"
22
23 namespace OHOS {
24 namespace {
25 constexpr size_t DATA_MIN_SIZE = 181;
26 constexpr char END_CHAR = '\0';
27 constexpr size_t LEN = 10;
28 bool g_flag = true;
29 } // namespace
30 using namespace OHOS::Security::AccessToken;
31
32 class ConfigObserver : public OHOS::AccessibilityConfig::AccessibilityConfigObserver {
33 public:
OnConfigChanged(const OHOS::AccessibilityConfig::CONFIG_ID id,const OHOS::AccessibilityConfig::ConfigValue & value)34 void OnConfigChanged(const OHOS::AccessibilityConfig::CONFIG_ID id,
35 const OHOS::AccessibilityConfig::ConfigValue &value) override
36 {
37 }
38 };
39
40 class EnableAbilityListObserver : public OHOS::AccessibilityConfig::AccessibilityEnableAbilityListsObserver {
41 public:
OnEnableAbilityListsStateChanged()42 void OnEnableAbilityListsStateChanged() override
43 {
44 }
45 };
46
47 template<class T>
GetObject(T & object,const uint8_t * data,size_t size)48 size_t GetObject(T &object, const uint8_t *data, size_t size)
49 {
50 size_t objectSize = sizeof(object);
51 if (objectSize > size) {
52 return 0;
53 }
54 return memcpy_s(&object, objectSize, data, objectSize) == EOK ? objectSize : 0;
55 }
56
AddPermission()57 void AddPermission()
58 {
59 if (g_flag) {
60 const char *perms[2];
61 perms[0] = OHOS::Accessibility::OHOS_PERMISSION_READ_ACCESSIBILITY_CONFIG.c_str();
62 perms[1] = OHOS::Accessibility::OHOS_PERMISSION_WRITE_ACCESSIBILITY_CONFIG.c_str();
63 NativeTokenInfoParams infoInstance = {
64 .dcapsNum = 0,
65 .permsNum = 2,
66 .aclsNum = 0,
67 .dcaps = nullptr,
68 .perms = perms,
69 .acls = nullptr,
70 .processName = "com.accessibility.config.fuzzer.test",
71 .aplStr = "normal",
72 };
73 uint64_t tokenId = GetAccessTokenId(&infoInstance);
74 SetSelfTokenID(tokenId);
75 AccessTokenKit::ReloadNativeTokenInfo();
76 g_flag = false;
77 }
78 }
79
GenerateCaptionProperty(OHOS::AccessibilityConfig::CaptionProperty & property,const uint8_t * data,size_t size)80 static size_t GenerateCaptionProperty(
81 OHOS::AccessibilityConfig::CaptionProperty &property, const uint8_t* data, size_t size)
82 {
83 size_t position = 0;
84 uint32_t temp = 0;
85 position += GetObject<uint32_t>(temp, &data[position], size - position);
86 property.SetFontColor(temp);
87
88 position += GetObject<uint32_t>(temp, &data[position], size - position);
89 property.SetWindowColor(temp);
90
91 position += GetObject<uint32_t>(temp, &data[position], size - position);
92 property.SetBackgroundColor(temp);
93
94 position += GetObject<uint32_t>(temp, &data[position], size - position);
95 property.SetFontScale(static_cast<int32_t>(temp));
96
97 char name[LEN + 1];
98 name[LEN] = END_CHAR;
99 for (size_t i = 0; i < LEN; i++) {
100 position += GetObject<char>(name[i], &data[position], size - position);
101 }
102 std::string family(name);
103 property.SetFontFamily(family);
104
105 for (size_t i = 0; i < LEN; i++) {
106 position += GetObject<char>(name[i], &data[position], size - position);
107 }
108 std::string type(name);
109 property.SetFontFamily(type);
110
111 return position;
112 }
113
DoSomethingInterestingSetConfig(OHOS::AccessibilityConfig::AccessibilityConfig & abConfig,const uint8_t * data,size_t size,size_t & startPos)114 void DoSomethingInterestingSetConfig(OHOS::AccessibilityConfig::AccessibilityConfig& abConfig,
115 const uint8_t* data, size_t size, size_t& startPos)
116 {
117 abConfig.SetScreenMagnificationState(data[startPos++] & 0x01);
118 abConfig.SetShortKeyState(data[startPos++] & 0x01);
119 abConfig.SetMouseKeyState(data[startPos++] & 0x01);
120 abConfig.SetCaptionsState(data[startPos++] & 0x01);
121 abConfig.SetHighContrastTextState(data[startPos++] & 0x01);
122 abConfig.SetInvertColorState(data[startPos++] & 0x01);
123 abConfig.SetAnimationOffState(data[startPos++] & 0x01);
124 abConfig.SetAudioMonoState(data[startPos++] & 0x01);
125
126 uint32_t temp = 0;
127 startPos += GetObject<uint32_t>(temp, &data[startPos], size - startPos);
128 abConfig.SetContentTimeout(temp);
129
130 startPos += GetObject<uint32_t>(temp, &data[startPos], size - startPos);
131 abConfig.SetDaltonizationColorFilter(static_cast<OHOS::AccessibilityConfig::DALTONIZATION_TYPE>(temp));
132
133 startPos += GetObject<uint32_t>(temp, &data[startPos], size - startPos);
134 abConfig.SetMouseAutoClick(static_cast<int32_t>(temp));
135
136 float tempFloat = 0;
137 startPos += GetObject<float>(tempFloat, &data[startPos], size - startPos);
138 abConfig.SetBrightnessDiscount(tempFloat);
139
140 startPos += GetObject<float>(tempFloat, &data[startPos], size - startPos);
141 abConfig.SetAudioBalance(tempFloat);
142
143 char name[LEN + 1];
144 name[LEN] = END_CHAR;
145 for (size_t i = 0; i < LEN; i++) {
146 startPos += GetObject<char>(name[i], &data[startPos], size - startPos);
147 }
148 std::string nameStr(name);
149 abConfig.SetShortkeyTarget(nameStr);
150
151 OHOS::AccessibilityConfig::CaptionProperty property;
152 startPos += GenerateCaptionProperty(property, &data[startPos], size - startPos);
153 abConfig.SetCaptionsProperty(property);
154 }
155
DoSomethingInterestingGetAbility(OHOS::AccessibilityConfig::AccessibilityConfig & abConfig,const uint8_t * data,size_t size,size_t & startPos)156 void DoSomethingInterestingGetAbility(OHOS::AccessibilityConfig::AccessibilityConfig& abConfig,
157 const uint8_t* data, size_t size, size_t& startPos)
158 {
159 char name[LEN + 1];
160 name[LEN] = END_CHAR;
161 uint32_t temp = 0;
162 std::shared_ptr<ConfigObserver> cObserver = std::make_shared<ConfigObserver>();
163 std::shared_ptr<EnableAbilityListObserver> eObserver = std::make_shared<EnableAbilityListObserver>();
164
165 for (size_t i = 0; i < LEN; i++) {
166 startPos += GetObject<char>(name[i], &data[startPos], size - startPos);
167 }
168 std::string abilityName1(name);
169 startPos += GetObject<uint32_t>(temp, &data[startPos], size - startPos);
170 abConfig.EnableAbility(abilityName1, temp);
171
172 for (size_t i = 0; i < LEN; i++) {
173 startPos += GetObject<char>(name[i], &data[startPos], size - startPos);
174 }
175 std::string abilityName2(name);
176 abConfig.DisableAbility(abilityName2);
177
178 bool flag = data[startPos++] & 0x01;
179 startPos += GetObject<uint32_t>(temp, &data[startPos], size - startPos);
180 abConfig.SubscribeConfigObserver(static_cast<OHOS::AccessibilityConfig::CONFIG_ID>(temp), cObserver, flag);
181 startPos += GetObject<uint32_t>(temp, &data[startPos], size - startPos);
182 abConfig.UnsubscribeConfigObserver(static_cast<OHOS::AccessibilityConfig::CONFIG_ID>(temp), cObserver);
183 abConfig.SubscribeEnableAbilityListsObserver(eObserver);
184 abConfig.UnsubscribeEnableAbilityListsObserver(eObserver);
185 }
186
DoSomethingInterestingGetConfig(OHOS::AccessibilityConfig::AccessibilityConfig & abConfig,const uint8_t * data,size_t size,size_t & startPos)187 void DoSomethingInterestingGetConfig(OHOS::AccessibilityConfig::AccessibilityConfig& abConfig,
188 const uint8_t* data, size_t size, size_t& startPos)
189 {
190 bool flag = data[startPos++] & 0x01;
191 abConfig.GetScreenMagnificationState(flag);
192 flag = data[startPos++] & 0x01;
193 abConfig.GetShortKeyState(flag);
194 flag = data[startPos++] & 0x01;
195 abConfig.GetMouseKeyState(flag);
196 flag = data[startPos++] & 0x01;
197 abConfig.GetCaptionsState(flag);
198 flag = data[startPos++] & 0x01;
199 abConfig.GetHighContrastTextState(flag);
200 flag = data[startPos++] & 0x01;
201 abConfig.GetInvertColorState(flag);
202 flag = data[startPos++] & 0x01;
203 abConfig.GetAnimationOffState(flag);
204 flag = data[startPos++] & 0x01;
205 abConfig.GetAudioMonoState(flag);
206
207 uint32_t temp = 0;
208 startPos += GetObject<uint32_t>(temp, &data[startPos], size - startPos);
209 abConfig.GetContentTimeout(temp);
210
211 startPos += GetObject<uint32_t>(temp, &data[startPos], size - startPos);
212 OHOS::AccessibilityConfig::DALTONIZATION_TYPE types =
213 static_cast<OHOS::AccessibilityConfig::DALTONIZATION_TYPE>(temp);
214 abConfig.GetDaltonizationColorFilter(types);
215
216 startPos += GetObject<uint32_t>(temp, &data[startPos], size - startPos);
217 int32_t clicks = static_cast<int32_t>(temp);
218 abConfig.GetMouseAutoClick(clicks);
219
220 float tempFloat = 0;
221 startPos += GetObject<float>(tempFloat, &data[startPos], size - startPos);
222 abConfig.GetBrightnessDiscount(tempFloat);
223
224 startPos += GetObject<float>(tempFloat, &data[startPos], size - startPos);
225 abConfig.GetAudioBalance(tempFloat);
226
227 char name[LEN + 1];
228 name[LEN] = END_CHAR;
229 for (size_t i = 0; i < LEN; i++) {
230 startPos += GetObject<char>(name[i], &data[startPos], size - startPos);
231 }
232 std::string nameStrForGet(name);
233 abConfig.GetShortkeyTarget(nameStrForGet);
234
235 OHOS::AccessibilityConfig::CaptionProperty propertyForGet;
236 GenerateCaptionProperty(propertyForGet, &data[startPos], size - startPos);
237 abConfig.GetCaptionsProperty(propertyForGet);
238 }
239
DoSomethingInterestingWithMyAPI(const uint8_t * data,size_t size)240 bool DoSomethingInterestingWithMyAPI(const uint8_t* data, size_t size)
241 {
242 if (data == nullptr || size < DATA_MIN_SIZE) {
243 return false;
244 }
245
246 auto &abConfig = OHOS::AccessibilityConfig::AccessibilityConfig::GetInstance();
247 (void)abConfig.InitializeContext();
248 size_t startPos = 0;
249 DoSomethingInterestingSetConfig(abConfig, data, size, startPos);
250 DoSomethingInterestingGetAbility(abConfig, data, size, startPos);
251 DoSomethingInterestingGetConfig(abConfig, data, size, startPos);
252
253 return true;
254 }
255 }
256
257 /* Fuzzer entry point */
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)258 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
259 {
260 OHOS::AddPermission();
261 /* Run your code on data */
262 OHOS::DoSomethingInterestingWithMyAPI(data, size);
263 return 0;
264 }
265