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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "chrome/common/component_flash_hint_file.h" | |
6 | |
7 #include <fcntl.h> | |
8 #include <sys/mman.h> | |
9 | |
10 #include "base/base64.h" | |
11 #include "base/files/file_path.h" | |
12 #include "base/files/file_util.h" | |
13 #include "base/files/important_file_writer.h" | |
14 #include "base/files/memory_mapped_file.h" | |
15 #include "base/files/scoped_file.h" | |
16 #include "base/json/json_string_value_serializer.h" | |
17 #include "base/path_service.h" | |
18 #include "base/posix/eintr_wrapper.h" | |
19 #include "base/stl_util.h" | |
20 #include "base/values.h" | |
21 #include "chrome/common/chrome_paths.h" | |
22 #include "crypto/sha2.h" | |
23 | |
24 namespace chrome { | |
25 | |
26 namespace { | |
27 // The current version of the hints file. | |
28 const int kCurrentHintFileVersion = 0x10; | |
29 // The earliest version of the hints file. | |
30 const int kEarliestHintFileVersion = 0x10; | |
31 // The Version field in the JSON encoded file. | |
32 const char kVersionField[] = "Version"; | |
33 // The HashAlgorithm field in the JSON encoded file. | |
34 const char kHashAlgoField[] = "HashAlgorithm"; | |
35 // The Hash field in the JSON encoded file. | |
36 const char kHashField[] = "Hash"; | |
37 // The PluginPath field in the JSON encoded file. | |
38 const char kPluginPath[] = "PluginPath"; | |
39 // The PluginVersion field in the JSON encoded file. | |
40 const char kPluginVersion[] = "PluginVersion"; | |
41 // For use with the scoped_ptr of an mmap-ed buffer | |
42 struct MmapDeleter { | |
43 size_t map_size; | |
44 inline void operator()(uint8_t* ptr) const { | |
45 if (ptr != MAP_FAILED) | |
46 munmap(ptr, map_size); | |
47 } | |
48 }; | |
49 | |
50 } // namespace | |
51 | |
52 // static | |
53 bool ComponentFlashHintFile::TestExecutableMapping(const base::FilePath& path) { | |
54 base::ScopedFD fd(HANDLE_EINTR(open(path.value().c_str(), O_RDONLY))); | |
55 if (!fd.is_valid()) | |
56 return false; | |
57 MmapDeleter deleter = {.map_size = sizeof(uint8_t)}; | |
58 scoped_ptr<uint8_t, MmapDeleter> buf_ptr( | |
59 reinterpret_cast<uint8_t*>(mmap(NULL, deleter.map_size, | |
60 PROT_READ | PROT_EXEC, MAP_PRIVATE, | |
61 fd.get(), 0)), | |
62 deleter); | |
63 return buf_ptr.get() != MAP_FAILED; | |
64 } | |
65 | |
66 // static | |
67 bool ComponentFlashHintFile::RecordFlashUpdate( | |
68 const base::FilePath& unpacked_plugin, | |
69 const base::FilePath& moved_plugin, | |
70 const std::string& version) { | |
71 base::MemoryMappedFile mapped_file; | |
72 if (!mapped_file.Initialize(unpacked_plugin)) | |
73 return false; | |
74 | |
75 std::string hash(crypto::kSHA256Length, 0); | |
76 crypto::SHA256HashBytes(mapped_file.data(), mapped_file.length(), | |
77 string_as_array(&hash), hash.size()); | |
78 | |
79 return WriteToDisk(kCurrentHintFileVersion, | |
80 crypto::SecureHash::Algorithm::SHA256, hash, moved_plugin, | |
81 version); | |
82 } | |
83 | |
84 // static | |
85 bool ComponentFlashHintFile::DoesHintFileExist() { | |
86 base::FilePath hint_file_path; | |
87 if (!PathService::Get(chrome::FILE_COMPONENT_FLASH_HINT, &hint_file_path)) | |
88 return false; | |
89 return base::PathExists(hint_file_path); | |
90 } | |
91 | |
92 // static | |
93 bool ComponentFlashHintFile::WriteToDisk( | |
94 int version, | |
95 crypto::SecureHash::Algorithm algorithm, | |
96 const std::string& hash, | |
97 const base::FilePath& plugin_path, | |
98 const std::string& flash_version) { | |
99 base::FilePath hint_file_path; | |
100 if (!PathService::Get(chrome::FILE_COMPONENT_FLASH_HINT, &hint_file_path)) | |
101 return false; | |
102 | |
103 std::string encoded_hash; | |
104 base::Base64Encode(hash, &encoded_hash); | |
105 | |
106 // Now construct a Value object to convert to JSON. | |
107 base::DictionaryValue dict; | |
108 dict.SetInteger(kVersionField, version); | |
109 dict.SetInteger(kHashAlgoField, crypto::SecureHash::SHA256); | |
110 dict.SetString(kHashField, encoded_hash); | |
111 dict.SetString(kPluginPath, plugin_path.value()); | |
112 dict.SetString(kPluginVersion, flash_version); | |
113 // Do the serialization of the DictionaryValue to JSON. | |
114 std::string json_string; | |
115 JSONStringValueSerializer serializer(&json_string); | |
116 if (!serializer.Serialize(dict)) | |
117 return false; | |
118 | |
119 return base::ImportantFileWriter::WriteFileAtomically(hint_file_path, | |
120 json_string); | |
121 } | |
122 | |
123 // static | |
124 bool ComponentFlashHintFile::VerifyAndReturnFlashLocation( | |
125 base::FilePath* path, | |
126 std::string* flash_version) { | |
127 base::FilePath hint_file_path; | |
128 if (!PathService::Get(chrome::FILE_COMPONENT_FLASH_HINT, &hint_file_path)) | |
129 return false; | |
130 | |
131 std::string json_string; | |
132 if (!base::ReadFileToString(hint_file_path, &json_string)) | |
133 return false; | |
134 | |
135 int error_code; | |
136 std::string error_message; | |
137 JSONStringValueDeserializer deserializer(json_string); | |
138 scoped_ptr<base::Value> value( | |
139 deserializer.Deserialize(&error_code, &error_message)); | |
140 | |
141 if (value == nullptr) { | |
142 LOG(ERROR) | |
143 << "Could not deserialize the component updated flash hint file. Error " | |
144 << error_code << ": " << error_message; | |
145 return false; | |
146 } | |
147 | |
148 base::DictionaryValue* dict = nullptr; | |
149 if (!value->GetAsDictionary(&dict)) | |
150 return false; | |
151 | |
152 int version; | |
153 if (!dict->GetInteger(kVersionField, &version)) | |
154 return false; | |
155 if (version < kEarliestHintFileVersion || version > kCurrentHintFileVersion) | |
156 return false; | |
157 | |
158 int hash_algorithm; | |
159 if (!dict->GetInteger(kHashAlgoField, &hash_algorithm)) | |
160 return false; | |
161 if (hash_algorithm != crypto::SecureHash::SHA256) | |
162 return false; | |
163 | |
164 std::string hash; | |
165 if (!dict->GetString(kHashField, &hash)) | |
166 return false; | |
167 | |
168 std::string plugin_path_str; | |
169 if (!dict->GetString(kPluginPath, &plugin_path_str)) | |
170 return false; | |
171 | |
172 std::string plugin_version_str; | |
173 if (!dict->GetString(kPluginVersion, &plugin_version_str)) | |
174 return false; | |
175 | |
176 std::string decoded_hash; | |
177 if (!base::Base64Decode(hash, &decoded_hash)) | |
178 return false; | |
179 | |
180 base::FilePath plugin_path(plugin_path_str); | |
181 base::MemoryMappedFile plugin_file; | |
182 if (!plugin_file.Initialize(plugin_path)) | |
183 return false; | |
184 | |
185 std::vector<uint8_t> file_hash(crypto::kSHA256Length, 0); | |
186 crypto::SHA256HashBytes(plugin_file.data(), plugin_file.length(), | |
187 &file_hash[0], file_hash.size()); | |
188 if (memcmp(&file_hash[0], string_as_array(&decoded_hash), | |
jln (very slow on Chromium)
2015/08/04 01:08:33
Ugh. There isn't a better API in crypto for this?
Greg K
2015/08/04 18:30:00
I will talk to Sleevi.
| |
189 crypto::kSHA256Length) != 0) { | |
190 LOG(ERROR) | |
191 << "The hash recorded in the component flash hint file does not " | |
192 "match the actual hash of the flash plugin found on disk. The " | |
193 "component flash plugin will not be loaded."; | |
194 return false; | |
195 } | |
196 | |
197 *path = plugin_path; | |
198 flash_version->assign(plugin_version_str); | |
199 return true; | |
200 } | |
201 | |
202 } // namespace chrome | |
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