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| 1 // Copyright (c) 2013 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 "net/quic/crypto/cert_compressor.h" | |
| 6 | |
| 7 #include <cstdint> | |
| 8 #include <memory> | |
| 9 | |
| 10 #include "base/logging.h" | |
| 11 #include "net/quic/quic_utils.h" | |
| 12 #include "third_party/zlib/zlib.h" | |
| 13 | |
| 14 using base::StringPiece; | |
| 15 using std::string; | |
| 16 using std::vector; | |
| 17 | |
| 18 namespace net { | |
| 19 | |
| 20 namespace { | |
| 21 | |
| 22 // kCommonCertSubstrings contains ~1500 bytes of common certificate substrings | |
| 23 // in order to help zlib. This was generated via a fairly dumb algorithm from | |
| 24 // the Alexa Top 5000 set - we could probably do better. | |
| 25 static const unsigned char kCommonCertSubstrings[] = { | |
| 26 0x04, 0x02, 0x30, 0x00, 0x30, 0x1d, 0x06, 0x03, 0x55, 0x1d, 0x25, 0x04, | |
| 27 0x16, 0x30, 0x14, 0x06, 0x08, 0x2b, 0x06, 0x01, 0x05, 0x05, 0x07, 0x03, | |
| 28 0x01, 0x06, 0x08, 0x2b, 0x06, 0x01, 0x05, 0x05, 0x07, 0x03, 0x02, 0x30, | |
| 29 0x5f, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x86, 0xf8, 0x42, 0x04, 0x01, | |
| 30 0x06, 0x06, 0x0b, 0x60, 0x86, 0x48, 0x01, 0x86, 0xfd, 0x6d, 0x01, 0x07, | |
| 31 0x17, 0x01, 0x30, 0x33, 0x20, 0x45, 0x78, 0x74, 0x65, 0x6e, 0x64, 0x65, | |
| 32 0x64, 0x20, 0x56, 0x61, 0x6c, 0x69, 0x64, 0x61, 0x74, 0x69, 0x6f, 0x6e, | |
| 33 0x20, 0x53, 0x20, 0x4c, 0x69, 0x6d, 0x69, 0x74, 0x65, 0x64, 0x31, 0x34, | |
| 34 0x20, 0x53, 0x53, 0x4c, 0x20, 0x43, 0x41, 0x30, 0x1e, 0x17, 0x0d, 0x31, | |
| 35 0x32, 0x20, 0x53, 0x65, 0x63, 0x75, 0x72, 0x65, 0x20, 0x53, 0x65, 0x72, | |
| 36 0x76, 0x65, 0x72, 0x20, 0x43, 0x41, 0x30, 0x2d, 0x61, 0x69, 0x61, 0x2e, | |
| 37 0x76, 0x65, 0x72, 0x69, 0x73, 0x69, 0x67, 0x6e, 0x2e, 0x63, 0x6f, 0x6d, | |
| 38 0x2f, 0x45, 0x2d, 0x63, 0x72, 0x6c, 0x2e, 0x76, 0x65, 0x72, 0x69, 0x73, | |
| 39 0x69, 0x67, 0x6e, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x45, 0x2e, 0x63, 0x65, | |
| 40 0x72, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, | |
| 41 0x01, 0x05, 0x05, 0x00, 0x03, 0x82, 0x01, 0x01, 0x00, 0x4a, 0x2e, 0x63, | |
| 42 0x6f, 0x6d, 0x2f, 0x72, 0x65, 0x73, 0x6f, 0x75, 0x72, 0x63, 0x65, 0x73, | |
| 43 0x2f, 0x63, 0x70, 0x73, 0x20, 0x28, 0x63, 0x29, 0x30, 0x30, 0x09, 0x06, | |
| 44 0x03, 0x55, 0x1d, 0x13, 0x04, 0x02, 0x30, 0x00, 0x30, 0x1d, 0x30, 0x0d, | |
| 45 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x05, 0x05, | |
| 46 0x00, 0x03, 0x82, 0x01, 0x01, 0x00, 0x7b, 0x30, 0x1d, 0x06, 0x03, 0x55, | |
| 47 0x1d, 0x0e, 0x30, 0x82, 0x01, 0x22, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, | |
| 48 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x82, 0x01, | |
| 49 0x0f, 0x00, 0x30, 0x82, 0x01, 0x0a, 0x02, 0x82, 0x01, 0x01, 0x00, 0xd2, | |
| 50 0x6f, 0x64, 0x6f, 0x63, 0x61, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x43, 0x2e, | |
| 51 0x63, 0x72, 0x6c, 0x30, 0x1d, 0x06, 0x03, 0x55, 0x1d, 0x0e, 0x04, 0x16, | |
| 52 0x04, 0x14, 0xb4, 0x2e, 0x67, 0x6c, 0x6f, 0x62, 0x61, 0x6c, 0x73, 0x69, | |
| 53 0x67, 0x6e, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x72, 0x30, 0x0b, 0x06, 0x03, | |
| 54 0x55, 0x1d, 0x0f, 0x04, 0x04, 0x03, 0x02, 0x01, 0x30, 0x0d, 0x06, 0x09, | |
| 55 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x05, 0x05, 0x00, 0x30, | |
| 56 0x81, 0xca, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03, 0x55, 0x04, 0x06, 0x13, | |
| 57 0x02, 0x55, 0x53, 0x31, 0x10, 0x30, 0x0e, 0x06, 0x03, 0x55, 0x04, 0x08, | |
| 58 0x13, 0x07, 0x41, 0x72, 0x69, 0x7a, 0x6f, 0x6e, 0x61, 0x31, 0x13, 0x30, | |
| 59 0x11, 0x06, 0x03, 0x55, 0x04, 0x07, 0x13, 0x0a, 0x53, 0x63, 0x6f, 0x74, | |
| 60 0x74, 0x73, 0x64, 0x61, 0x6c, 0x65, 0x31, 0x1a, 0x30, 0x18, 0x06, 0x03, | |
| 61 0x55, 0x04, 0x0a, 0x13, 0x11, 0x47, 0x6f, 0x44, 0x61, 0x64, 0x64, 0x79, | |
| 62 0x2e, 0x63, 0x6f, 0x6d, 0x2c, 0x20, 0x49, 0x6e, 0x63, 0x2e, 0x31, 0x33, | |
| 63 0x30, 0x31, 0x06, 0x03, 0x55, 0x04, 0x0b, 0x13, 0x2a, 0x68, 0x74, 0x74, | |
| 64 0x70, 0x3a, 0x2f, 0x2f, 0x63, 0x65, 0x72, 0x74, 0x69, 0x66, 0x69, 0x63, | |
| 65 0x61, 0x74, 0x65, 0x73, 0x2e, 0x67, 0x6f, 0x64, 0x61, 0x64, 0x64, 0x79, | |
| 66 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x72, 0x65, 0x70, 0x6f, 0x73, 0x69, 0x74, | |
| 67 0x6f, 0x72, 0x79, 0x31, 0x30, 0x30, 0x2e, 0x06, 0x03, 0x55, 0x04, 0x03, | |
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| 69 0x65, 0x63, 0x75, 0x72, 0x65, 0x20, 0x43, 0x65, 0x72, 0x74, 0x69, 0x66, | |
| 70 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x20, 0x41, 0x75, 0x74, 0x68, | |
| 71 0x6f, 0x72, 0x69, 0x74, 0x79, 0x31, 0x11, 0x30, 0x0f, 0x06, 0x03, 0x55, | |
| 72 0x04, 0x05, 0x13, 0x08, 0x30, 0x37, 0x39, 0x36, 0x39, 0x32, 0x38, 0x37, | |
| 73 0x30, 0x1e, 0x17, 0x0d, 0x31, 0x31, 0x30, 0x0e, 0x06, 0x03, 0x55, 0x1d, | |
| 74 0x0f, 0x01, 0x01, 0xff, 0x04, 0x04, 0x03, 0x02, 0x05, 0xa0, 0x30, 0x0c, | |
| 75 0x06, 0x03, 0x55, 0x1d, 0x13, 0x01, 0x01, 0xff, 0x04, 0x02, 0x30, 0x00, | |
| 76 0x30, 0x1d, 0x30, 0x0f, 0x06, 0x03, 0x55, 0x1d, 0x13, 0x01, 0x01, 0xff, | |
| 77 0x04, 0x05, 0x30, 0x03, 0x01, 0x01, 0x00, 0x30, 0x1d, 0x06, 0x03, 0x55, | |
| 78 0x1d, 0x25, 0x04, 0x16, 0x30, 0x14, 0x06, 0x08, 0x2b, 0x06, 0x01, 0x05, | |
| 79 0x05, 0x07, 0x03, 0x01, 0x06, 0x08, 0x2b, 0x06, 0x01, 0x05, 0x05, 0x07, | |
| 80 0x03, 0x02, 0x30, 0x0e, 0x06, 0x03, 0x55, 0x1d, 0x0f, 0x01, 0x01, 0xff, | |
| 81 0x04, 0x04, 0x03, 0x02, 0x05, 0xa0, 0x30, 0x33, 0x06, 0x03, 0x55, 0x1d, | |
| 82 0x1f, 0x04, 0x2c, 0x30, 0x2a, 0x30, 0x28, 0xa0, 0x26, 0xa0, 0x24, 0x86, | |
| 83 0x22, 0x68, 0x74, 0x74, 0x70, 0x3a, 0x2f, 0x2f, 0x63, 0x72, 0x6c, 0x2e, | |
| 84 0x67, 0x6f, 0x64, 0x61, 0x64, 0x64, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, | |
| 85 0x67, 0x64, 0x73, 0x31, 0x2d, 0x32, 0x30, 0x2a, 0x30, 0x28, 0x06, 0x08, | |
| 86 0x2b, 0x06, 0x01, 0x05, 0x05, 0x07, 0x02, 0x01, 0x16, 0x1c, 0x68, 0x74, | |
| 87 0x74, 0x70, 0x73, 0x3a, 0x2f, 0x2f, 0x77, 0x77, 0x77, 0x2e, 0x76, 0x65, | |
| 88 0x72, 0x69, 0x73, 0x69, 0x67, 0x6e, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63, | |
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| 90 0x0d, 0x31, 0x33, 0x30, 0x35, 0x30, 0x39, 0x06, 0x08, 0x2b, 0x06, 0x01, | |
| 91 0x05, 0x05, 0x07, 0x30, 0x02, 0x86, 0x2d, 0x68, 0x74, 0x74, 0x70, 0x3a, | |
| 92 0x2f, 0x2f, 0x73, 0x30, 0x39, 0x30, 0x37, 0x06, 0x08, 0x2b, 0x06, 0x01, | |
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| 94 0x3d, 0x30, 0x3b, 0x30, 0x39, 0x06, 0x0b, 0x60, 0x86, 0x48, 0x01, 0x86, | |
| 95 0xf8, 0x45, 0x01, 0x07, 0x17, 0x06, 0x31, 0x0b, 0x30, 0x09, 0x06, 0x03, | |
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| 125 0x6f, 0x6d, 0x2f, 0x63, 0x72, 0x6c, 0x73, 0x2f, 0x73, 0x64, 0x31, 0x1a, | |
| 126 0x30, 0x18, 0x06, 0x03, 0x55, 0x04, 0x0a, 0x68, 0x74, 0x74, 0x70, 0x3a, | |
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| 129 0x74, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x31, 0x6f, 0x63, 0x73, 0x70, 0x2e, | |
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| 138 0x61, 0x64, 0x64, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x30, 0x4a, 0x06, | |
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| 142 0x64, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x72, 0x65, 0x70, 0x6f, 0x73, | |
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| 144 0x65, 0x72, 0x6d, 0x65, 0x64, 0x69, 0x61, 0x74, 0x65, 0x2e, 0x63, 0x72, | |
| 145 0x74, 0x30, 0x1f, 0x06, 0x03, 0x55, 0x1d, 0x23, 0x04, 0x18, 0x30, 0x16, | |
| 146 0x80, 0x14, 0xfd, 0xac, 0x61, 0x32, 0x93, 0x6c, 0x45, 0xd6, 0xe2, 0xee, | |
| 147 0x85, 0x5f, 0x9a, 0xba, 0xe7, 0x76, 0x99, 0x68, 0xcc, 0xe7, 0x30, 0x27, | |
| 148 0x86, 0x29, 0x68, 0x74, 0x74, 0x70, 0x3a, 0x2f, 0x2f, 0x63, 0x86, 0x30, | |
| 149 0x68, 0x74, 0x74, 0x70, 0x3a, 0x2f, 0x2f, 0x73, | |
| 150 }; | |
| 151 | |
| 152 // CertEntry represents a certificate in compressed form. Each entry is one of | |
| 153 // the three types enumerated in |Type|. | |
| 154 struct CertEntry { | |
| 155 public: | |
| 156 enum Type { | |
| 157 // Type 0 is reserved to mean "end of list" in the wire format. | |
| 158 | |
| 159 // COMPRESSED means that the certificate is included in the trailing zlib | |
| 160 // data. | |
| 161 COMPRESSED = 1, | |
| 162 // CACHED means that the certificate is already known to the peer and will | |
| 163 // be replaced by its 64-bit hash (in |hash|). | |
| 164 CACHED = 2, | |
| 165 // COMMON means that the certificate is in a common certificate set known | |
| 166 // to the peer with hash |set_hash| and certificate index |index|. | |
| 167 COMMON = 3, | |
| 168 }; | |
| 169 | |
| 170 Type type; | |
| 171 uint64_t hash; | |
| 172 uint64_t set_hash; | |
| 173 uint32_t index; | |
| 174 }; | |
| 175 | |
| 176 // MatchCerts returns a vector of CertEntries describing how to most | |
| 177 // efficiently represent |certs| to a peer who has the common sets identified | |
| 178 // by |client_common_set_hashes| and who has cached the certificates with the | |
| 179 // 64-bit, FNV-1a hashes in |client_cached_cert_hashes|. | |
| 180 vector<CertEntry> MatchCerts(const vector<string>& certs, | |
| 181 StringPiece client_common_set_hashes, | |
| 182 StringPiece client_cached_cert_hashes, | |
| 183 const CommonCertSets* common_sets) { | |
| 184 vector<CertEntry> entries; | |
| 185 entries.reserve(certs.size()); | |
| 186 | |
| 187 const bool cached_valid = | |
| 188 client_cached_cert_hashes.size() % sizeof(uint64_t) == 0 && | |
| 189 !client_cached_cert_hashes.empty(); | |
| 190 | |
| 191 for (vector<string>::const_iterator i = certs.begin(); i != certs.end(); | |
| 192 ++i) { | |
| 193 CertEntry entry; | |
| 194 | |
| 195 if (cached_valid) { | |
| 196 bool cached = false; | |
| 197 | |
| 198 uint64_t hash = QuicUtils::FNV1a_64_Hash(i->data(), i->size()); | |
| 199 // This assumes that the machine is little-endian. | |
| 200 for (size_t j = 0; j < client_cached_cert_hashes.size(); | |
| 201 j += sizeof(uint64_t)) { | |
| 202 uint64_t cached_hash; | |
| 203 memcpy(&cached_hash, client_cached_cert_hashes.data() + j, | |
| 204 sizeof(uint64_t)); | |
| 205 if (hash != cached_hash) { | |
| 206 continue; | |
| 207 } | |
| 208 | |
| 209 entry.type = CertEntry::CACHED; | |
| 210 entry.hash = hash; | |
| 211 entries.push_back(entry); | |
| 212 cached = true; | |
| 213 break; | |
| 214 } | |
| 215 | |
| 216 if (cached) { | |
| 217 continue; | |
| 218 } | |
| 219 } | |
| 220 | |
| 221 if (common_sets && | |
| 222 common_sets->MatchCert(*i, client_common_set_hashes, &entry.set_hash, | |
| 223 &entry.index)) { | |
| 224 entry.type = CertEntry::COMMON; | |
| 225 entries.push_back(entry); | |
| 226 continue; | |
| 227 } | |
| 228 | |
| 229 entry.type = CertEntry::COMPRESSED; | |
| 230 entries.push_back(entry); | |
| 231 } | |
| 232 | |
| 233 return entries; | |
| 234 } | |
| 235 | |
| 236 // CertEntriesSize returns the size, in bytes, of the serialised form of | |
| 237 // |entries|. | |
| 238 size_t CertEntriesSize(const vector<CertEntry>& entries) { | |
| 239 size_t entries_size = 0; | |
| 240 | |
| 241 for (vector<CertEntry>::const_iterator i = entries.begin(); | |
| 242 i != entries.end(); ++i) { | |
| 243 entries_size++; | |
| 244 switch (i->type) { | |
| 245 case CertEntry::COMPRESSED: | |
| 246 break; | |
| 247 case CertEntry::CACHED: | |
| 248 entries_size += sizeof(uint64_t); | |
| 249 break; | |
| 250 case CertEntry::COMMON: | |
| 251 entries_size += sizeof(uint64_t) + sizeof(uint32_t); | |
| 252 break; | |
| 253 } | |
| 254 } | |
| 255 | |
| 256 entries_size++; // for end marker | |
| 257 | |
| 258 return entries_size; | |
| 259 } | |
| 260 | |
| 261 // SerializeCertEntries serialises |entries| to |out|, which must have enough | |
| 262 // space to contain them. | |
| 263 void SerializeCertEntries(uint8_t* out, const vector<CertEntry>& entries) { | |
| 264 for (vector<CertEntry>::const_iterator i = entries.begin(); | |
| 265 i != entries.end(); ++i) { | |
| 266 *out++ = static_cast<uint8_t>(i->type); | |
| 267 switch (i->type) { | |
| 268 case CertEntry::COMPRESSED: | |
| 269 break; | |
| 270 case CertEntry::CACHED: | |
| 271 memcpy(out, &i->hash, sizeof(i->hash)); | |
| 272 out += sizeof(uint64_t); | |
| 273 break; | |
| 274 case CertEntry::COMMON: | |
| 275 // Assumes a little-endian machine. | |
| 276 memcpy(out, &i->set_hash, sizeof(i->set_hash)); | |
| 277 out += sizeof(i->set_hash); | |
| 278 memcpy(out, &i->index, sizeof(uint32_t)); | |
| 279 out += sizeof(uint32_t); | |
| 280 break; | |
| 281 } | |
| 282 } | |
| 283 | |
| 284 *out++ = 0; // end marker | |
| 285 } | |
| 286 | |
| 287 // ZlibDictForEntries returns a string that contains the zlib pre-shared | |
| 288 // dictionary to use in order to decompress a zlib block following |entries|. | |
| 289 // |certs| is one-to-one with |entries| and contains the certificates for those | |
| 290 // entries that are CACHED or COMMON. | |
| 291 string ZlibDictForEntries(const vector<CertEntry>& entries, | |
| 292 const vector<string>& certs) { | |
| 293 string zlib_dict; | |
| 294 | |
| 295 // The dictionary starts with the common and cached certs in reverse order. | |
| 296 size_t zlib_dict_size = 0; | |
| 297 for (size_t i = certs.size() - 1; i < certs.size(); i--) { | |
| 298 if (entries[i].type != CertEntry::COMPRESSED) { | |
| 299 zlib_dict_size += certs[i].size(); | |
| 300 } | |
| 301 } | |
| 302 | |
| 303 // At the end of the dictionary is a block of common certificate substrings. | |
| 304 zlib_dict_size += sizeof(kCommonCertSubstrings); | |
| 305 | |
| 306 zlib_dict.reserve(zlib_dict_size); | |
| 307 | |
| 308 for (size_t i = certs.size() - 1; i < certs.size(); i--) { | |
| 309 if (entries[i].type != CertEntry::COMPRESSED) { | |
| 310 zlib_dict += certs[i]; | |
| 311 } | |
| 312 } | |
| 313 | |
| 314 zlib_dict += string(reinterpret_cast<const char*>(kCommonCertSubstrings), | |
| 315 sizeof(kCommonCertSubstrings)); | |
| 316 | |
| 317 DCHECK_EQ(zlib_dict.size(), zlib_dict_size); | |
| 318 | |
| 319 return zlib_dict; | |
| 320 } | |
| 321 | |
| 322 // HashCerts returns the FNV-1a hashes of |certs|. | |
| 323 vector<uint64_t> HashCerts(const vector<string>& certs) { | |
| 324 vector<uint64_t> ret; | |
| 325 ret.reserve(certs.size()); | |
| 326 | |
| 327 for (vector<string>::const_iterator i = certs.begin(); i != certs.end(); | |
| 328 ++i) { | |
| 329 ret.push_back(QuicUtils::FNV1a_64_Hash(i->data(), i->size())); | |
| 330 } | |
| 331 | |
| 332 return ret; | |
| 333 } | |
| 334 | |
| 335 // ParseEntries parses the serialised form of a vector of CertEntries from | |
| 336 // |in_out| and writes them to |out_entries|. CACHED and COMMON entries are | |
| 337 // resolved using |cached_certs| and |common_sets| and written to |out_certs|. | |
| 338 // |in_out| is updated to contain the trailing data. | |
| 339 bool ParseEntries(StringPiece* in_out, | |
| 340 const vector<string>& cached_certs, | |
| 341 const CommonCertSets* common_sets, | |
| 342 vector<CertEntry>* out_entries, | |
| 343 vector<string>* out_certs) { | |
| 344 StringPiece in = *in_out; | |
| 345 vector<uint64_t> cached_hashes; | |
| 346 | |
| 347 out_entries->clear(); | |
| 348 out_certs->clear(); | |
| 349 | |
| 350 for (;;) { | |
| 351 if (in.empty()) { | |
| 352 return false; | |
| 353 } | |
| 354 CertEntry entry; | |
| 355 const uint8_t type_byte = in[0]; | |
| 356 in.remove_prefix(1); | |
| 357 | |
| 358 if (type_byte == 0) { | |
| 359 break; | |
| 360 } | |
| 361 | |
| 362 entry.type = static_cast<CertEntry::Type>(type_byte); | |
| 363 | |
| 364 switch (entry.type) { | |
| 365 case CertEntry::COMPRESSED: | |
| 366 out_certs->push_back(string()); | |
| 367 break; | |
| 368 case CertEntry::CACHED: { | |
| 369 if (in.size() < sizeof(uint64_t)) { | |
| 370 return false; | |
| 371 } | |
| 372 memcpy(&entry.hash, in.data(), sizeof(uint64_t)); | |
| 373 in.remove_prefix(sizeof(uint64_t)); | |
| 374 | |
| 375 if (cached_hashes.size() != cached_certs.size()) { | |
| 376 cached_hashes = HashCerts(cached_certs); | |
| 377 } | |
| 378 bool found = false; | |
| 379 for (size_t i = 0; i < cached_hashes.size(); i++) { | |
| 380 if (cached_hashes[i] == entry.hash) { | |
| 381 out_certs->push_back(cached_certs[i]); | |
| 382 found = true; | |
| 383 break; | |
| 384 } | |
| 385 } | |
| 386 if (!found) { | |
| 387 return false; | |
| 388 } | |
| 389 break; | |
| 390 } | |
| 391 case CertEntry::COMMON: { | |
| 392 if (!common_sets) { | |
| 393 return false; | |
| 394 } | |
| 395 if (in.size() < sizeof(uint64_t) + sizeof(uint32_t)) { | |
| 396 return false; | |
| 397 } | |
| 398 memcpy(&entry.set_hash, in.data(), sizeof(uint64_t)); | |
| 399 in.remove_prefix(sizeof(uint64_t)); | |
| 400 memcpy(&entry.index, in.data(), sizeof(uint32_t)); | |
| 401 in.remove_prefix(sizeof(uint32_t)); | |
| 402 | |
| 403 StringPiece cert = common_sets->GetCert(entry.set_hash, entry.index); | |
| 404 if (cert.empty()) { | |
| 405 return false; | |
| 406 } | |
| 407 out_certs->push_back(cert.as_string()); | |
| 408 break; | |
| 409 } | |
| 410 default: | |
| 411 return false; | |
| 412 } | |
| 413 out_entries->push_back(entry); | |
| 414 } | |
| 415 | |
| 416 *in_out = in; | |
| 417 return true; | |
| 418 } | |
| 419 | |
| 420 // ScopedZLib deals with the automatic destruction of a zlib context. | |
| 421 class ScopedZLib { | |
| 422 public: | |
| 423 enum Type { | |
| 424 INFLATE, | |
| 425 DEFLATE, | |
| 426 }; | |
| 427 | |
| 428 explicit ScopedZLib(Type type) : z_(nullptr), type_(type) {} | |
| 429 | |
| 430 void reset(z_stream* z) { | |
| 431 Clear(); | |
| 432 z_ = z; | |
| 433 } | |
| 434 | |
| 435 ~ScopedZLib() { Clear(); } | |
| 436 | |
| 437 private: | |
| 438 void Clear() { | |
| 439 if (!z_) { | |
| 440 return; | |
| 441 } | |
| 442 | |
| 443 if (type_ == DEFLATE) { | |
| 444 deflateEnd(z_); | |
| 445 } else { | |
| 446 inflateEnd(z_); | |
| 447 } | |
| 448 z_ = nullptr; | |
| 449 } | |
| 450 | |
| 451 z_stream* z_; | |
| 452 const Type type_; | |
| 453 }; | |
| 454 | |
| 455 } // anonymous namespace | |
| 456 | |
| 457 // static | |
| 458 string CertCompressor::CompressChain(const vector<string>& certs, | |
| 459 StringPiece client_common_set_hashes, | |
| 460 StringPiece client_cached_cert_hashes, | |
| 461 const CommonCertSets* common_sets) { | |
| 462 const vector<CertEntry> entries = MatchCerts( | |
| 463 certs, client_common_set_hashes, client_cached_cert_hashes, common_sets); | |
| 464 DCHECK_EQ(entries.size(), certs.size()); | |
| 465 | |
| 466 size_t uncompressed_size = 0; | |
| 467 for (size_t i = 0; i < entries.size(); i++) { | |
| 468 if (entries[i].type == CertEntry::COMPRESSED) { | |
| 469 uncompressed_size += 4 /* uint32_t length */ + certs[i].size(); | |
| 470 } | |
| 471 } | |
| 472 | |
| 473 size_t compressed_size = 0; | |
| 474 z_stream z; | |
| 475 ScopedZLib scoped_z(ScopedZLib::DEFLATE); | |
| 476 | |
| 477 if (uncompressed_size > 0) { | |
| 478 memset(&z, 0, sizeof(z)); | |
| 479 int rv = deflateInit(&z, Z_DEFAULT_COMPRESSION); | |
| 480 DCHECK_EQ(Z_OK, rv); | |
| 481 if (rv != Z_OK) { | |
| 482 return ""; | |
| 483 } | |
| 484 scoped_z.reset(&z); | |
| 485 | |
| 486 string zlib_dict = ZlibDictForEntries(entries, certs); | |
| 487 | |
| 488 rv = deflateSetDictionary( | |
| 489 &z, reinterpret_cast<const uint8_t*>(&zlib_dict[0]), zlib_dict.size()); | |
| 490 DCHECK_EQ(Z_OK, rv); | |
| 491 if (rv != Z_OK) { | |
| 492 return ""; | |
| 493 } | |
| 494 | |
| 495 compressed_size = deflateBound(&z, uncompressed_size); | |
| 496 } | |
| 497 | |
| 498 const size_t entries_size = CertEntriesSize(entries); | |
| 499 | |
| 500 string result; | |
| 501 result.resize(entries_size + (uncompressed_size > 0 ? 4 : 0) + | |
| 502 compressed_size); | |
| 503 | |
| 504 uint8_t* j = reinterpret_cast<uint8_t*>(&result[0]); | |
| 505 SerializeCertEntries(j, entries); | |
| 506 j += entries_size; | |
| 507 | |
| 508 if (uncompressed_size == 0) { | |
| 509 return result; | |
| 510 } | |
| 511 | |
| 512 uint32_t uncompressed_size_32 = uncompressed_size; | |
| 513 memcpy(j, &uncompressed_size_32, sizeof(uint32_t)); | |
| 514 j += sizeof(uint32_t); | |
| 515 | |
| 516 int rv; | |
| 517 | |
| 518 z.next_out = j; | |
| 519 z.avail_out = compressed_size; | |
| 520 | |
| 521 for (size_t i = 0; i < certs.size(); i++) { | |
| 522 if (entries[i].type != CertEntry::COMPRESSED) { | |
| 523 continue; | |
| 524 } | |
| 525 | |
| 526 uint32_t length32 = certs[i].size(); | |
| 527 z.next_in = reinterpret_cast<uint8_t*>(&length32); | |
| 528 z.avail_in = sizeof(length32); | |
| 529 rv = deflate(&z, Z_NO_FLUSH); | |
| 530 DCHECK_EQ(Z_OK, rv); | |
| 531 DCHECK_EQ(0u, z.avail_in); | |
| 532 if (rv != Z_OK || z.avail_in) { | |
| 533 return ""; | |
| 534 } | |
| 535 | |
| 536 z.next_in = | |
| 537 const_cast<uint8_t*>(reinterpret_cast<const uint8_t*>(certs[i].data())); | |
| 538 z.avail_in = certs[i].size(); | |
| 539 rv = deflate(&z, Z_NO_FLUSH); | |
| 540 DCHECK_EQ(Z_OK, rv); | |
| 541 DCHECK_EQ(0u, z.avail_in); | |
| 542 if (rv != Z_OK || z.avail_in) { | |
| 543 return ""; | |
| 544 } | |
| 545 } | |
| 546 | |
| 547 z.avail_in = 0; | |
| 548 rv = deflate(&z, Z_FINISH); | |
| 549 DCHECK_EQ(Z_STREAM_END, rv); | |
| 550 if (rv != Z_STREAM_END) { | |
| 551 return ""; | |
| 552 } | |
| 553 | |
| 554 result.resize(result.size() - z.avail_out); | |
| 555 return result; | |
| 556 } | |
| 557 | |
| 558 // static | |
| 559 bool CertCompressor::DecompressChain(StringPiece in, | |
| 560 const vector<string>& cached_certs, | |
| 561 const CommonCertSets* common_sets, | |
| 562 vector<string>* out_certs) { | |
| 563 vector<CertEntry> entries; | |
| 564 if (!ParseEntries(&in, cached_certs, common_sets, &entries, out_certs)) { | |
| 565 return false; | |
| 566 } | |
| 567 DCHECK_EQ(entries.size(), out_certs->size()); | |
| 568 | |
| 569 std::unique_ptr<uint8_t[]> uncompressed_data; | |
| 570 StringPiece uncompressed; | |
| 571 | |
| 572 if (!in.empty()) { | |
| 573 if (in.size() < sizeof(uint32_t)) { | |
| 574 return false; | |
| 575 } | |
| 576 | |
| 577 uint32_t uncompressed_size; | |
| 578 memcpy(&uncompressed_size, in.data(), sizeof(uncompressed_size)); | |
| 579 in.remove_prefix(sizeof(uint32_t)); | |
| 580 | |
| 581 if (uncompressed_size > 128 * 1024) { | |
| 582 return false; | |
| 583 } | |
| 584 | |
| 585 uncompressed_data.reset(new uint8_t[uncompressed_size]); | |
| 586 z_stream z; | |
| 587 ScopedZLib scoped_z(ScopedZLib::INFLATE); | |
| 588 | |
| 589 memset(&z, 0, sizeof(z)); | |
| 590 z.next_out = uncompressed_data.get(); | |
| 591 z.avail_out = uncompressed_size; | |
| 592 z.next_in = | |
| 593 const_cast<uint8_t*>(reinterpret_cast<const uint8_t*>(in.data())); | |
| 594 z.avail_in = in.size(); | |
| 595 | |
| 596 if (Z_OK != inflateInit(&z)) { | |
| 597 return false; | |
| 598 } | |
| 599 scoped_z.reset(&z); | |
| 600 | |
| 601 int rv = inflate(&z, Z_FINISH); | |
| 602 if (rv == Z_NEED_DICT) { | |
| 603 string zlib_dict = ZlibDictForEntries(entries, *out_certs); | |
| 604 const uint8_t* dict = reinterpret_cast<const uint8_t*>(zlib_dict.data()); | |
| 605 if (Z_OK != inflateSetDictionary(&z, dict, zlib_dict.size())) { | |
| 606 return false; | |
| 607 } | |
| 608 rv = inflate(&z, Z_FINISH); | |
| 609 } | |
| 610 | |
| 611 if (Z_STREAM_END != rv || z.avail_out > 0 || z.avail_in > 0) { | |
| 612 return false; | |
| 613 } | |
| 614 | |
| 615 uncompressed = StringPiece(reinterpret_cast<char*>(uncompressed_data.get()), | |
| 616 uncompressed_size); | |
| 617 } | |
| 618 | |
| 619 for (size_t i = 0; i < entries.size(); i++) { | |
| 620 switch (entries[i].type) { | |
| 621 case CertEntry::COMPRESSED: | |
| 622 if (uncompressed.size() < sizeof(uint32_t)) { | |
| 623 return false; | |
| 624 } | |
| 625 uint32_t cert_len; | |
| 626 memcpy(&cert_len, uncompressed.data(), sizeof(cert_len)); | |
| 627 uncompressed.remove_prefix(sizeof(uint32_t)); | |
| 628 if (uncompressed.size() < cert_len) { | |
| 629 return false; | |
| 630 } | |
| 631 (*out_certs)[i] = uncompressed.substr(0, cert_len).as_string(); | |
| 632 uncompressed.remove_prefix(cert_len); | |
| 633 break; | |
| 634 case CertEntry::CACHED: | |
| 635 case CertEntry::COMMON: | |
| 636 break; | |
| 637 } | |
| 638 } | |
| 639 | |
| 640 if (!uncompressed.empty()) { | |
| 641 return false; | |
| 642 } | |
| 643 | |
| 644 return true; | |
| 645 } | |
| 646 | |
| 647 } // namespace net | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2193073003:
Move shared files in net/quic/ into net/quic/core/ (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master