1 /*
2 * Copyright (c) 2023 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 "json_parser.h"
17
18 #include <fcntl.h>
19 #include <memory>
20 #include <sys/stat.h>
21 #include <sys/types.h>
22 #include <unistd.h>
23
24 #include "accesstoken_log.h"
25 #include "access_token_error.h"
26 #include "access_token.h"
27
28 namespace OHOS {
29 namespace Security {
30 namespace AccessToken {
31 namespace {
32 static constexpr OHOS::HiviewDFX::HiLogLabel LABEL = {LOG_CORE, SECURITY_DOMAIN_ACCESSTOKEN, "JsonParser"};
33 constexpr int MAX_NATIVE_CONFIG_FILE_SIZE = 5 * 1024 * 1024; // 5M
34 constexpr size_t BUFFER_SIZE = 1024;
35 }
36
GetStringFromJson(const nlohmann::json & j,const std::string & tag,std::string & out)37 bool JsonParser::GetStringFromJson(const nlohmann::json& j, const std::string& tag, std::string& out)
38 {
39 if (j.find(tag) != j.end() && j.at(tag).is_string()) {
40 out = j.at(tag).get<std::string>();
41 return true;
42 }
43 return false;
44 }
45
GetIntFromJson(const nlohmann::json & j,const std::string & tag,int & out)46 bool JsonParser::GetIntFromJson(const nlohmann::json& j, const std::string& tag, int& out)
47 {
48 if (j.find(tag) != j.end() && j.at(tag).is_number()) {
49 out = j.at(tag).get<int>();
50 return true;
51 }
52 return false;
53 }
54
GetUnsignedIntFromJson(const nlohmann::json & j,const std::string & tag,unsigned int & out)55 bool JsonParser::GetUnsignedIntFromJson(const nlohmann::json& j, const std::string& tag, unsigned int& out)
56 {
57 if (j.find(tag) != j.end() && j.at(tag).is_number()) {
58 out = j.at(tag).get<unsigned int>();
59 return true;
60 }
61 return false;
62 }
63
GetBoolFromJson(const nlohmann::json & j,const std::string & tag,bool & out)64 bool JsonParser::GetBoolFromJson(const nlohmann::json& j, const std::string& tag, bool& out)
65 {
66 if (j.find(tag) != j.end() && j.at(tag).is_boolean()) {
67 out = j.at(tag).get<bool>();
68 return true;
69 }
70 return false;
71 }
72
ReadCfgFile(const std::string & file,std::string & rawData)73 int32_t JsonParser::ReadCfgFile(const std::string& file, std::string& rawData)
74 {
75 char filePath[PATH_MAX + 1] = {0};
76 if (realpath(file.c_str(), filePath) == NULL) {
77 return ERR_FILE_OPERATE_FAILED;
78 }
79 int32_t fd = open(filePath, O_RDONLY);
80 if (fd < 0) {
81 ACCESSTOKEN_LOG_ERROR(LABEL, "Open failed errno %{public}d.", errno);
82 return ERR_FILE_OPERATE_FAILED;
83 }
84 struct stat statBuffer;
85
86 if (fstat(fd, &statBuffer) != 0) {
87 ACCESSTOKEN_LOG_ERROR(LABEL, "Fstat failed.");
88 close(fd);
89 return ERR_FILE_OPERATE_FAILED;
90 }
91
92 if (statBuffer.st_size == 0) {
93 ACCESSTOKEN_LOG_ERROR(LABEL, "Config file size is invalid.");
94 close(fd);
95 return ERR_PARAM_INVALID;
96 }
97 if (statBuffer.st_size > MAX_NATIVE_CONFIG_FILE_SIZE) {
98 ACCESSTOKEN_LOG_ERROR(LABEL, "Config file size is too large.");
99 close(fd);
100 return ERR_OVERSIZE;
101 }
102 rawData.reserve(statBuffer.st_size);
103
104 char buff[BUFFER_SIZE] = { 0 };
105 ssize_t readLen = 0;
106 while ((readLen = read(fd, buff, BUFFER_SIZE)) > 0) {
107 rawData.append(buff, readLen);
108 }
109 close(fd);
110 if (readLen == 0) {
111 return RET_SUCCESS;
112 }
113 return ERR_FILE_OPERATE_FAILED;
114 }
115
IsDirExsit(const std::string & file)116 bool JsonParser::IsDirExsit(const std::string& file)
117 {
118 if (file.empty()) {
119 ACCESSTOKEN_LOG_ERROR(LABEL, "File path is empty");
120 return false;
121 }
122
123 struct stat buf;
124 if (stat(file.c_str(), &buf) != 0) {
125 ACCESSTOKEN_LOG_ERROR(LABEL, "Get file attributes failed, errno %{public}d.", errno);
126 return false;
127 }
128
129 if (!S_ISDIR(buf.st_mode)) {
130 ACCESSTOKEN_LOG_ERROR(LABEL, "File mode is not directory.");
131 return false;
132 }
133
134 return true;
135 }
136 } // namespace AccessToken
137 } // namespace Security
138 } // namespace OHOS