1 | /* |
2 | * Copyright (C) 2015 Apple Inc. All rights reserved. |
3 | * |
4 | * Redistribution and use in source and binary forms, with or without |
5 | * modification, are permitted provided that the following conditions |
6 | * are met: |
7 | * 1. Redistributions of source code must retain the above copyright |
8 | * notice, this list of conditions and the following disclaimer. |
9 | * 2. Redistributions in binary form must reproduce the above copyright |
10 | * notice, this list of conditions and the following disclaimer in the |
11 | * documentation and/or other materials provided with the distribution. |
12 | * |
13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
14 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
15 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
17 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
18 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
19 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
20 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
21 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
22 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
23 | * THE POSSIBILITY OF SUCH DAMAGE. |
24 | */ |
25 | |
26 | #include "config.h" |
27 | #include "NetworkCacheData.h" |
28 | |
29 | #include <fcntl.h> |
30 | #include <wtf/CryptographicallyRandomNumber.h> |
31 | #include <wtf/FileSystem.h> |
32 | |
33 | #if !OS(WINDOWS) |
34 | #include <sys/mman.h> |
35 | #include <sys/stat.h> |
36 | #include <unistd.h> |
37 | #endif |
38 | |
39 | namespace WebKit { |
40 | namespace NetworkCache { |
41 | |
42 | #if !OS(WINDOWS) |
43 | Data Data::mapToFile(const String& path) const |
44 | { |
45 | int fd = open(FileSystem::fileSystemRepresentation(path).data(), O_CREAT | O_EXCL | O_RDWR , S_IRUSR | S_IWUSR); |
46 | if (fd < 0) |
47 | return { }; |
48 | |
49 | if (ftruncate(fd, m_size) < 0) { |
50 | close(fd); |
51 | return { }; |
52 | } |
53 | |
54 | void* map = mmap(nullptr, m_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); |
55 | if (map == MAP_FAILED) { |
56 | close(fd); |
57 | return { }; |
58 | } |
59 | |
60 | uint8_t* mapData = static_cast<uint8_t*>(map); |
61 | apply([&mapData](const uint8_t* bytes, size_t bytesSize) { |
62 | memcpy(mapData, bytes, bytesSize); |
63 | mapData += bytesSize; |
64 | return true; |
65 | }); |
66 | |
67 | // Drop the write permission. |
68 | mprotect(map, m_size, PROT_READ); |
69 | |
70 | // Flush (asynchronously) to file, turning this into clean memory. |
71 | msync(map, m_size, MS_ASYNC); |
72 | |
73 | return Data::adoptMap(map, m_size, fd); |
74 | } |
75 | #else |
76 | Data Data::mapToFile(const String& path) const |
77 | { |
78 | auto file = FileSystem::openFile(path, FileSystem::FileOpenMode::Write); |
79 | if (!FileSystem::isHandleValid(file)) |
80 | return { }; |
81 | if (FileSystem::writeToFile(file, reinterpret_cast<const char*>(data()), size()) < 0) |
82 | return { }; |
83 | return Data(Vector<uint8_t>(m_buffer)); |
84 | } |
85 | #endif |
86 | |
87 | #if !OS(WINDOWS) |
88 | Data mapFile(const char* path) |
89 | { |
90 | int fd = open(path, O_RDONLY, 0); |
91 | if (fd < 0) |
92 | return { }; |
93 | struct stat stat; |
94 | if (fstat(fd, &stat) < 0) { |
95 | close(fd); |
96 | return { }; |
97 | } |
98 | size_t size = stat.st_size; |
99 | if (!size) { |
100 | close(fd); |
101 | return Data::empty(); |
102 | } |
103 | |
104 | return adoptAndMapFile(fd, 0, size); |
105 | } |
106 | #endif |
107 | |
108 | Data mapFile(const String& path) |
109 | { |
110 | #if !OS(WINDOWS) |
111 | return mapFile(FileSystem::fileSystemRepresentation(path).data()); |
112 | #else |
113 | auto file = FileSystem::openFile(path, FileSystem::FileOpenMode::Read); |
114 | if (!FileSystem::isHandleValid(file)) |
115 | return { }; |
116 | long long size; |
117 | if (!FileSystem::getFileSize(file, size)) |
118 | return { }; |
119 | return adoptAndMapFile(file, 0, size); |
120 | #endif |
121 | } |
122 | |
123 | #if !OS(WINDOWS) |
124 | Data adoptAndMapFile(int fd, size_t offset, size_t size) |
125 | { |
126 | if (!size) { |
127 | close(fd); |
128 | return Data::empty(); |
129 | } |
130 | |
131 | void* map = mmap(nullptr, size, PROT_READ, MAP_PRIVATE, fd, offset); |
132 | if (map == MAP_FAILED) { |
133 | close(fd); |
134 | return { }; |
135 | } |
136 | |
137 | return Data::adoptMap(map, size, fd); |
138 | } |
139 | #else |
140 | Data adoptAndMapFile(FileSystem::PlatformFileHandle file, size_t offset, size_t size) |
141 | { |
142 | return Data(file, offset, size); |
143 | } |
144 | #endif |
145 | |
146 | SHA1::Digest computeSHA1(const Data& data, const Salt& salt) |
147 | { |
148 | SHA1 sha1; |
149 | sha1.addBytes(salt.data(), salt.size()); |
150 | data.apply([&sha1](const uint8_t* data, size_t size) { |
151 | sha1.addBytes(data, size); |
152 | return true; |
153 | }); |
154 | |
155 | SHA1::Digest digest; |
156 | sha1.computeHash(digest); |
157 | return digest; |
158 | } |
159 | |
160 | bool bytesEqual(const Data& a, const Data& b) |
161 | { |
162 | if (a.isNull() || b.isNull()) |
163 | return false; |
164 | if (a.size() != b.size()) |
165 | return false; |
166 | return !memcmp(a.data(), b.data(), a.size()); |
167 | } |
168 | |
169 | static Salt makeSalt() |
170 | { |
171 | Salt salt; |
172 | static_assert(salt.size() == 8, "Salt size" ); |
173 | *reinterpret_cast<uint32_t*>(&salt[0]) = cryptographicallyRandomNumber(); |
174 | *reinterpret_cast<uint32_t*>(&salt[4]) = cryptographicallyRandomNumber(); |
175 | return salt; |
176 | } |
177 | |
178 | Optional<Salt> readOrMakeSalt(const String& path) |
179 | { |
180 | #if !OS(WINDOWS) |
181 | auto cpath = FileSystem::fileSystemRepresentation(path); |
182 | auto fd = open(cpath.data(), O_RDONLY, 0); |
183 | Salt salt; |
184 | auto bytesRead = read(fd, salt.data(), salt.size()); |
185 | close(fd); |
186 | if (bytesRead != static_cast<ssize_t>(salt.size())) { |
187 | salt = makeSalt(); |
188 | |
189 | unlink(cpath.data()); |
190 | fd = open(cpath.data(), O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR); |
191 | bool success = write(fd, salt.data(), salt.size()) == static_cast<ssize_t>(salt.size()); |
192 | close(fd); |
193 | if (!success) |
194 | return { }; |
195 | } |
196 | return salt; |
197 | #else |
198 | auto file = FileSystem::openFile(path, FileSystem::FileOpenMode::Read); |
199 | Salt salt; |
200 | auto bytesRead = FileSystem::readFromFile(file, reinterpret_cast<char*>(salt.data()), salt.size()); |
201 | FileSystem::closeFile(file); |
202 | if (bytesRead != salt.size()) { |
203 | salt = makeSalt(); |
204 | |
205 | FileSystem::deleteFile(path); |
206 | file = FileSystem::openFile(path, FileSystem::FileOpenMode::Write); |
207 | bool success = FileSystem::writeToFile(file, reinterpret_cast<char*>(salt.data()), salt.size()) == salt.size(); |
208 | FileSystem::closeFile(file); |
209 | if (!success) |
210 | return { }; |
211 | } |
212 | return salt; |
213 | #endif |
214 | } |
215 | |
216 | } // namespace NetworkCache |
217 | } // namespace WebKit |
218 | |