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| 1 // Copyright 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/quic_crypto_client_config.h" | |
| 6 | |
| 7 #include "base/metrics/histogram.h" | |
| 8 #include "base/metrics/sparse_histogram.h" | |
| 9 #include "base/profiler/scoped_tracker.h" | |
| 10 #include "base/stl_util.h" | |
| 11 #include "base/strings/string_util.h" | |
| 12 #include "net/quic/crypto/cert_compressor.h" | |
| 13 #include "net/quic/crypto/chacha20_poly1305_encrypter.h" | |
| 14 #include "net/quic/crypto/channel_id.h" | |
| 15 #include "net/quic/crypto/common_cert_set.h" | |
| 16 #include "net/quic/crypto/crypto_framer.h" | |
| 17 #include "net/quic/crypto/crypto_utils.h" | |
| 18 #include "net/quic/crypto/curve25519_key_exchange.h" | |
| 19 #include "net/quic/crypto/key_exchange.h" | |
| 20 #include "net/quic/crypto/p256_key_exchange.h" | |
| 21 #include "net/quic/crypto/proof_verifier.h" | |
| 22 #include "net/quic/crypto/quic_encrypter.h" | |
| 23 #include "net/quic/quic_utils.h" | |
| 24 | |
| 25 using base::StringPiece; | |
| 26 using std::map; | |
| 27 using std::string; | |
| 28 using std::vector; | |
| 29 | |
| 30 namespace net { | |
| 31 | |
| 32 namespace { | |
| 33 | |
| 34 // Tracks the reason (the state of the server config) for sending inchoate | |
| 35 // ClientHello to the server. | |
| 36 void RecordInchoateClientHelloReason( | |
| 37 QuicCryptoClientConfig::CachedState::ServerConfigState state) { | |
| 38 UMA_HISTOGRAM_ENUMERATION( | |
| 39 "Net.QuicInchoateClientHelloReason", state, | |
| 40 QuicCryptoClientConfig::CachedState::SERVER_CONFIG_COUNT); | |
| 41 } | |
| 42 | |
| 43 // Tracks the state of the QUIC server information loaded from the disk cache. | |
| 44 void RecordDiskCacheServerConfigState( | |
| 45 QuicCryptoClientConfig::CachedState::ServerConfigState state) { | |
| 46 UMA_HISTOGRAM_ENUMERATION( | |
| 47 "Net.QuicServerInfo.DiskCacheState", state, | |
| 48 QuicCryptoClientConfig::CachedState::SERVER_CONFIG_COUNT); | |
| 49 } | |
| 50 | |
| 51 } // namespace | |
| 52 | |
| 53 QuicCryptoClientConfig::QuicCryptoClientConfig() | |
| 54 : disable_ecdsa_(false) { | |
| 55 SetDefaults(); | |
| 56 } | |
| 57 | |
| 58 QuicCryptoClientConfig::~QuicCryptoClientConfig() { | |
| 59 STLDeleteValues(&cached_states_); | |
| 60 } | |
| 61 | |
| 62 QuicCryptoClientConfig::CachedState::CachedState() | |
| 63 : server_config_valid_(false), | |
| 64 generation_counter_(0) {} | |
| 65 | |
| 66 QuicCryptoClientConfig::CachedState::~CachedState() {} | |
| 67 | |
| 68 bool QuicCryptoClientConfig::CachedState::IsComplete(QuicWallTime now) const { | |
| 69 if (server_config_.empty()) { | |
| 70 RecordInchoateClientHelloReason(SERVER_CONFIG_EMPTY); | |
| 71 return false; | |
| 72 } | |
| 73 | |
| 74 if (!server_config_valid_) { | |
| 75 RecordInchoateClientHelloReason(SERVER_CONFIG_INVALID); | |
| 76 return false; | |
| 77 } | |
| 78 | |
| 79 const CryptoHandshakeMessage* scfg = GetServerConfig(); | |
| 80 if (!scfg) { | |
| 81 // Should be impossible short of cache corruption. | |
| 82 DCHECK(false); | |
| 83 RecordInchoateClientHelloReason(SERVER_CONFIG_CORRUPTED); | |
| 84 return false; | |
| 85 } | |
| 86 | |
| 87 uint64 expiry_seconds; | |
| 88 if (scfg->GetUint64(kEXPY, &expiry_seconds) != QUIC_NO_ERROR) { | |
| 89 RecordInchoateClientHelloReason(SERVER_CONFIG_INVALID_EXPIRY); | |
| 90 return false; | |
| 91 } | |
| 92 if (now.ToUNIXSeconds() >= expiry_seconds) { | |
| 93 UMA_HISTOGRAM_CUSTOM_TIMES( | |
| 94 "Net.QuicClientHelloServerConfig.InvalidDuration", | |
| 95 base::TimeDelta::FromSeconds(now.ToUNIXSeconds() - expiry_seconds), | |
| 96 base::TimeDelta::FromMinutes(1), base::TimeDelta::FromDays(20), 50); | |
| 97 RecordInchoateClientHelloReason(SERVER_CONFIG_EXPIRED); | |
| 98 return false; | |
| 99 } | |
| 100 | |
| 101 return true; | |
| 102 } | |
| 103 | |
| 104 bool QuicCryptoClientConfig::CachedState::IsEmpty() const { | |
| 105 return server_config_.empty(); | |
| 106 } | |
| 107 | |
| 108 const CryptoHandshakeMessage* | |
| 109 QuicCryptoClientConfig::CachedState::GetServerConfig() const { | |
| 110 if (server_config_.empty()) { | |
| 111 return nullptr; | |
| 112 } | |
| 113 | |
| 114 if (!scfg_.get()) { | |
| 115 scfg_.reset(CryptoFramer::ParseMessage(server_config_)); | |
| 116 DCHECK(scfg_.get()); | |
| 117 } | |
| 118 return scfg_.get(); | |
| 119 } | |
| 120 | |
| 121 QuicCryptoClientConfig::CachedState::ServerConfigState | |
| 122 QuicCryptoClientConfig::CachedState::SetServerConfig( | |
| 123 StringPiece server_config, QuicWallTime now, string* error_details) { | |
| 124 const bool matches_existing = server_config == server_config_; | |
| 125 | |
| 126 // Even if the new server config matches the existing one, we still wish to | |
| 127 // reject it if it has expired. | |
| 128 scoped_ptr<CryptoHandshakeMessage> new_scfg_storage; | |
| 129 const CryptoHandshakeMessage* new_scfg; | |
| 130 | |
| 131 if (!matches_existing) { | |
| 132 new_scfg_storage.reset(CryptoFramer::ParseMessage(server_config)); | |
| 133 new_scfg = new_scfg_storage.get(); | |
| 134 } else { | |
| 135 new_scfg = GetServerConfig(); | |
| 136 } | |
| 137 | |
| 138 if (!new_scfg) { | |
| 139 *error_details = "SCFG invalid"; | |
| 140 return SERVER_CONFIG_INVALID; | |
| 141 } | |
| 142 | |
| 143 uint64 expiry_seconds; | |
| 144 if (new_scfg->GetUint64(kEXPY, &expiry_seconds) != QUIC_NO_ERROR) { | |
| 145 *error_details = "SCFG missing EXPY"; | |
| 146 return SERVER_CONFIG_INVALID_EXPIRY; | |
| 147 } | |
| 148 | |
| 149 if (now.ToUNIXSeconds() >= expiry_seconds) { | |
| 150 *error_details = "SCFG has expired"; | |
| 151 return SERVER_CONFIG_EXPIRED; | |
| 152 } | |
| 153 | |
| 154 if (!matches_existing) { | |
| 155 server_config_ = server_config.as_string(); | |
| 156 SetProofInvalid(); | |
| 157 scfg_.reset(new_scfg_storage.release()); | |
| 158 } | |
| 159 return SERVER_CONFIG_VALID; | |
| 160 } | |
| 161 | |
| 162 void QuicCryptoClientConfig::CachedState::InvalidateServerConfig() { | |
| 163 server_config_.clear(); | |
| 164 scfg_.reset(); | |
| 165 SetProofInvalid(); | |
| 166 } | |
| 167 | |
| 168 void QuicCryptoClientConfig::CachedState::SetProof(const vector<string>& certs, | |
| 169 StringPiece signature) { | |
| 170 bool has_changed = | |
| 171 signature != server_config_sig_ || certs_.size() != certs.size(); | |
| 172 | |
| 173 if (!has_changed) { | |
| 174 for (size_t i = 0; i < certs_.size(); i++) { | |
| 175 if (certs_[i] != certs[i]) { | |
| 176 has_changed = true; | |
| 177 break; | |
| 178 } | |
| 179 } | |
| 180 } | |
| 181 | |
| 182 if (!has_changed) { | |
| 183 return; | |
| 184 } | |
| 185 | |
| 186 // If the proof has changed then it needs to be revalidated. | |
| 187 SetProofInvalid(); | |
| 188 certs_ = certs; | |
| 189 server_config_sig_ = signature.as_string(); | |
| 190 } | |
| 191 | |
| 192 void QuicCryptoClientConfig::CachedState::Clear() { | |
| 193 server_config_.clear(); | |
| 194 source_address_token_.clear(); | |
| 195 certs_.clear(); | |
| 196 server_config_sig_.clear(); | |
| 197 server_config_valid_ = false; | |
| 198 proof_verify_details_.reset(); | |
| 199 scfg_.reset(); | |
| 200 ++generation_counter_; | |
| 201 } | |
| 202 | |
| 203 void QuicCryptoClientConfig::CachedState::ClearProof() { | |
| 204 SetProofInvalid(); | |
| 205 certs_.clear(); | |
| 206 server_config_sig_.clear(); | |
| 207 } | |
| 208 | |
| 209 void QuicCryptoClientConfig::CachedState::SetProofValid() { | |
| 210 server_config_valid_ = true; | |
| 211 } | |
| 212 | |
| 213 void QuicCryptoClientConfig::CachedState::SetProofInvalid() { | |
| 214 server_config_valid_ = false; | |
| 215 ++generation_counter_; | |
| 216 } | |
| 217 | |
| 218 bool QuicCryptoClientConfig::CachedState::Initialize( | |
| 219 StringPiece server_config, | |
| 220 StringPiece source_address_token, | |
| 221 const vector<string>& certs, | |
| 222 StringPiece signature, | |
| 223 QuicWallTime now) { | |
| 224 DCHECK(server_config_.empty()); | |
| 225 | |
| 226 if (server_config.empty()) { | |
| 227 RecordDiskCacheServerConfigState(SERVER_CONFIG_EMPTY); | |
| 228 return false; | |
| 229 } | |
| 230 | |
| 231 string error_details; | |
| 232 ServerConfigState state = SetServerConfig(server_config, now, | |
| 233 &error_details); | |
| 234 RecordDiskCacheServerConfigState(state); | |
| 235 if (state != SERVER_CONFIG_VALID) { | |
| 236 DVLOG(1) << "SetServerConfig failed with " << error_details; | |
| 237 return false; | |
| 238 } | |
| 239 | |
| 240 signature.CopyToString(&server_config_sig_); | |
| 241 source_address_token.CopyToString(&source_address_token_); | |
| 242 certs_ = certs; | |
| 243 return true; | |
| 244 } | |
| 245 | |
| 246 const string& QuicCryptoClientConfig::CachedState::server_config() const { | |
| 247 return server_config_; | |
| 248 } | |
| 249 | |
| 250 const string& | |
| 251 QuicCryptoClientConfig::CachedState::source_address_token() const { | |
| 252 return source_address_token_; | |
| 253 } | |
| 254 | |
| 255 const vector<string>& QuicCryptoClientConfig::CachedState::certs() const { | |
| 256 return certs_; | |
| 257 } | |
| 258 | |
| 259 const string& QuicCryptoClientConfig::CachedState::signature() const { | |
| 260 return server_config_sig_; | |
| 261 } | |
| 262 | |
| 263 bool QuicCryptoClientConfig::CachedState::proof_valid() const { | |
| 264 return server_config_valid_; | |
| 265 } | |
| 266 | |
| 267 uint64 QuicCryptoClientConfig::CachedState::generation_counter() const { | |
| 268 return generation_counter_; | |
| 269 } | |
| 270 | |
| 271 const ProofVerifyDetails* | |
| 272 QuicCryptoClientConfig::CachedState::proof_verify_details() const { | |
| 273 return proof_verify_details_.get(); | |
| 274 } | |
| 275 | |
| 276 void QuicCryptoClientConfig::CachedState::set_source_address_token( | |
| 277 StringPiece token) { | |
| 278 source_address_token_ = token.as_string(); | |
| 279 } | |
| 280 | |
| 281 void QuicCryptoClientConfig::CachedState::SetProofVerifyDetails( | |
| 282 ProofVerifyDetails* details) { | |
| 283 proof_verify_details_.reset(details); | |
| 284 } | |
| 285 | |
| 286 void QuicCryptoClientConfig::CachedState::InitializeFrom( | |
| 287 const QuicCryptoClientConfig::CachedState& other) { | |
| 288 DCHECK(server_config_.empty()); | |
| 289 DCHECK(!server_config_valid_); | |
| 290 server_config_ = other.server_config_; | |
| 291 source_address_token_ = other.source_address_token_; | |
| 292 certs_ = other.certs_; | |
| 293 server_config_sig_ = other.server_config_sig_; | |
| 294 server_config_valid_ = other.server_config_valid_; | |
| 295 if (other.proof_verify_details_.get() != nullptr) { | |
| 296 proof_verify_details_.reset(other.proof_verify_details_->Clone()); | |
| 297 } | |
| 298 ++generation_counter_; | |
| 299 } | |
| 300 | |
| 301 void QuicCryptoClientConfig::SetDefaults() { | |
| 302 // Key exchange methods. | |
| 303 kexs.resize(2); | |
| 304 kexs[0] = kC255; | |
| 305 kexs[1] = kP256; | |
| 306 | |
| 307 // Authenticated encryption algorithms. Prefer ChaCha20 by default. | |
| 308 aead.clear(); | |
| 309 if (ChaCha20Poly1305Encrypter::IsSupported()) { | |
| 310 aead.push_back(kCC12); | |
| 311 } | |
| 312 aead.push_back(kAESG); | |
| 313 | |
| 314 disable_ecdsa_ = false; | |
| 315 } | |
| 316 | |
| 317 QuicCryptoClientConfig::CachedState* QuicCryptoClientConfig::LookupOrCreate( | |
| 318 const QuicServerId& server_id) { | |
| 319 CachedStateMap::const_iterator it = cached_states_.find(server_id); | |
| 320 if (it != cached_states_.end()) { | |
| 321 return it->second; | |
| 322 } | |
| 323 | |
| 324 CachedState* cached = new CachedState; | |
| 325 cached_states_.insert(std::make_pair(server_id, cached)); | |
| 326 bool cache_populated = PopulateFromCanonicalConfig(server_id, cached); | |
| 327 UMA_HISTOGRAM_BOOLEAN( | |
| 328 "Net.QuicCryptoClientConfig.PopulatedFromCanonicalConfig", | |
| 329 cache_populated); | |
| 330 return cached; | |
| 331 } | |
| 332 | |
| 333 void QuicCryptoClientConfig::ClearCachedStates() { | |
| 334 for (CachedStateMap::const_iterator it = cached_states_.begin(); | |
| 335 it != cached_states_.end(); ++it) { | |
| 336 it->second->Clear(); | |
| 337 } | |
| 338 } | |
| 339 | |
| 340 void QuicCryptoClientConfig::FillInchoateClientHello( | |
| 341 const QuicServerId& server_id, | |
| 342 const QuicVersion preferred_version, | |
| 343 const CachedState* cached, | |
| 344 QuicCryptoNegotiatedParameters* out_params, | |
| 345 CryptoHandshakeMessage* out) const { | |
| 346 // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed. | |
| 347 tracked_objects::ScopedTracker tracking_profile( | |
| 348 FROM_HERE_WITH_EXPLICIT_FUNCTION( | |
| 349 "422516 QuicCryptoClientConfig::FillInchoateClientHello")); | |
| 350 | |
| 351 out->set_tag(kCHLO); | |
| 352 out->set_minimum_size(kClientHelloMinimumSize); | |
| 353 | |
| 354 // Server name indication. We only send SNI if it's a valid domain name, as | |
| 355 // per the spec. | |
| 356 if (CryptoUtils::IsValidSNI(server_id.host())) { | |
| 357 out->SetStringPiece(kSNI, server_id.host()); | |
| 358 } | |
| 359 out->SetValue(kVER, QuicVersionToQuicTag(preferred_version)); | |
| 360 | |
| 361 if (!user_agent_id_.empty()) { | |
| 362 out->SetStringPiece(kUAID, user_agent_id_); | |
| 363 } | |
| 364 | |
| 365 if (!cached->source_address_token().empty()) { | |
| 366 out->SetStringPiece(kSourceAddressTokenTag, cached->source_address_token()); | |
| 367 } | |
| 368 | |
| 369 if (server_id.is_https()) { | |
| 370 if (disable_ecdsa_) { | |
| 371 out->SetTaglist(kPDMD, kX59R, 0); | |
| 372 } else { | |
| 373 out->SetTaglist(kPDMD, kX509, 0); | |
| 374 } | |
| 375 } | |
| 376 | |
| 377 if (common_cert_sets) { | |
| 378 out->SetStringPiece(kCCS, common_cert_sets->GetCommonHashes()); | |
| 379 } | |
| 380 | |
| 381 const vector<string>& certs = cached->certs(); | |
| 382 // We save |certs| in the QuicCryptoNegotiatedParameters so that, if the | |
| 383 // client config is being used for multiple connections, another connection | |
| 384 // doesn't update the cached certificates and cause us to be unable to | |
| 385 // process the server's compressed certificate chain. | |
| 386 out_params->cached_certs = certs; | |
| 387 if (!certs.empty()) { | |
| 388 vector<uint64> hashes; | |
| 389 hashes.reserve(certs.size()); | |
| 390 for (vector<string>::const_iterator i = certs.begin(); | |
| 391 i != certs.end(); ++i) { | |
| 392 hashes.push_back(QuicUtils::FNV1a_64_Hash(i->data(), i->size())); | |
| 393 } | |
| 394 out->SetVector(kCCRT, hashes); | |
| 395 } | |
| 396 } | |
| 397 | |
| 398 QuicErrorCode QuicCryptoClientConfig::FillClientHello( | |
| 399 const QuicServerId& server_id, | |
| 400 QuicConnectionId connection_id, | |
| 401 const QuicVersion preferred_version, | |
| 402 const CachedState* cached, | |
| 403 QuicWallTime now, | |
| 404 QuicRandom* rand, | |
| 405 const ChannelIDKey* channel_id_key, | |
| 406 QuicCryptoNegotiatedParameters* out_params, | |
| 407 CryptoHandshakeMessage* out, | |
| 408 string* error_details) const { | |
| 409 // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed. | |
| 410 tracked_objects::ScopedTracker tracking_profile( | |
| 411 FROM_HERE_WITH_EXPLICIT_FUNCTION( | |
| 412 "422516 QuicCryptoClientConfig::FillClientHello")); | |
| 413 | |
| 414 DCHECK(error_details != nullptr); | |
| 415 | |
| 416 FillInchoateClientHello(server_id, preferred_version, cached, | |
| 417 out_params, out); | |
| 418 | |
| 419 const CryptoHandshakeMessage* scfg = cached->GetServerConfig(); | |
| 420 if (!scfg) { | |
| 421 // This should never happen as our caller should have checked | |
| 422 // cached->IsComplete() before calling this function. | |
| 423 *error_details = "Handshake not ready"; | |
| 424 return QUIC_CRYPTO_INTERNAL_ERROR; | |
| 425 } | |
| 426 | |
| 427 StringPiece scid; | |
| 428 if (!scfg->GetStringPiece(kSCID, &scid)) { | |
| 429 *error_details = "SCFG missing SCID"; | |
| 430 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 431 } | |
| 432 out->SetStringPiece(kSCID, scid); | |
| 433 | |
| 434 const QuicTag* their_aeads; | |
| 435 const QuicTag* their_key_exchanges; | |
| 436 size_t num_their_aeads, num_their_key_exchanges; | |
| 437 if (scfg->GetTaglist(kAEAD, &their_aeads, | |
| 438 &num_their_aeads) != QUIC_NO_ERROR || | |
| 439 scfg->GetTaglist(kKEXS, &their_key_exchanges, | |
| 440 &num_their_key_exchanges) != QUIC_NO_ERROR) { | |
| 441 *error_details = "Missing AEAD or KEXS"; | |
| 442 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 443 } | |
| 444 | |
| 445 // AEAD: the work loads on the client and server are symmetric. Since the | |
| 446 // client is more likely to be CPU-constrained, break the tie by favoring | |
| 447 // the client's preference. | |
| 448 // Key exchange: the client does more work than the server, so favor the | |
| 449 // client's preference. | |
| 450 size_t key_exchange_index; | |
| 451 if (!QuicUtils::FindMutualTag( | |
| 452 aead, their_aeads, num_their_aeads, QuicUtils::LOCAL_PRIORITY, | |
| 453 &out_params->aead, nullptr) || | |
| 454 !QuicUtils::FindMutualTag( | |
| 455 kexs, their_key_exchanges, num_their_key_exchanges, | |
| 456 QuicUtils::LOCAL_PRIORITY, &out_params->key_exchange, | |
| 457 &key_exchange_index)) { | |
| 458 *error_details = "Unsupported AEAD or KEXS"; | |
| 459 return QUIC_CRYPTO_NO_SUPPORT; | |
| 460 } | |
| 461 out->SetTaglist(kAEAD, out_params->aead, 0); | |
| 462 out->SetTaglist(kKEXS, out_params->key_exchange, 0); | |
| 463 | |
| 464 StringPiece public_value; | |
| 465 if (scfg->GetNthValue24(kPUBS, key_exchange_index, &public_value) != | |
| 466 QUIC_NO_ERROR) { | |
| 467 *error_details = "Missing public value"; | |
| 468 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 469 } | |
| 470 | |
| 471 StringPiece orbit; | |
| 472 if (!scfg->GetStringPiece(kORBT, &orbit) || orbit.size() != kOrbitSize) { | |
| 473 *error_details = "SCFG missing OBIT"; | |
| 474 return QUIC_CRYPTO_MESSAGE_PARAMETER_NOT_FOUND; | |
| 475 } | |
| 476 | |
| 477 CryptoUtils::GenerateNonce(now, rand, orbit, &out_params->client_nonce); | |
| 478 out->SetStringPiece(kNONC, out_params->client_nonce); | |
| 479 if (!out_params->server_nonce.empty()) { | |
| 480 out->SetStringPiece(kServerNonceTag, out_params->server_nonce); | |
| 481 } | |
| 482 | |
| 483 switch (out_params->key_exchange) { | |
| 484 case kC255: | |
| 485 out_params->client_key_exchange.reset(Curve25519KeyExchange::New( | |
| 486 Curve25519KeyExchange::NewPrivateKey(rand))); | |
| 487 break; | |
| 488 case kP256: | |
| 489 out_params->client_key_exchange.reset(P256KeyExchange::New( | |
| 490 P256KeyExchange::NewPrivateKey())); | |
| 491 break; | |
| 492 default: | |
| 493 DCHECK(false); | |
| 494 *error_details = "Configured to support an unknown key exchange"; | |
| 495 return QUIC_CRYPTO_INTERNAL_ERROR; | |
| 496 } | |
| 497 | |
| 498 if (!out_params->client_key_exchange->CalculateSharedKey( | |
| 499 public_value, &out_params->initial_premaster_secret)) { | |
| 500 *error_details = "Key exchange failure"; | |
| 501 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 502 } | |
| 503 out->SetStringPiece(kPUBS, out_params->client_key_exchange->public_value()); | |
| 504 | |
| 505 if (channel_id_key) { | |
| 506 // In order to calculate the encryption key for the CETV block we need to | |
| 507 // serialise the client hello as it currently is (i.e. without the CETV | |
| 508 // block). For this, the client hello is serialized without padding. | |
| 509 const size_t orig_min_size = out->minimum_size(); | |
| 510 out->set_minimum_size(0); | |
| 511 | |
| 512 CryptoHandshakeMessage cetv; | |
| 513 cetv.set_tag(kCETV); | |
| 514 | |
| 515 string hkdf_input; | |
| 516 const QuicData& client_hello_serialized = out->GetSerialized(); | |
| 517 hkdf_input.append(QuicCryptoConfig::kCETVLabel, | |
| 518 strlen(QuicCryptoConfig::kCETVLabel) + 1); | |
| 519 hkdf_input.append(reinterpret_cast<char*>(&connection_id), | |
| 520 sizeof(connection_id)); | |
| 521 hkdf_input.append(client_hello_serialized.data(), | |
| 522 client_hello_serialized.length()); | |
| 523 hkdf_input.append(cached->server_config()); | |
| 524 | |
| 525 string key = channel_id_key->SerializeKey(); | |
| 526 string signature; | |
| 527 if (!channel_id_key->Sign(hkdf_input, &signature)) { | |
| 528 *error_details = "Channel ID signature failed"; | |
| 529 return QUIC_INVALID_CHANNEL_ID_SIGNATURE; | |
| 530 } | |
| 531 | |
| 532 cetv.SetStringPiece(kCIDK, key); | |
| 533 cetv.SetStringPiece(kCIDS, signature); | |
| 534 | |
| 535 CrypterPair crypters; | |
| 536 if (!CryptoUtils::DeriveKeys(out_params->initial_premaster_secret, | |
| 537 out_params->aead, out_params->client_nonce, | |
| 538 out_params->server_nonce, hkdf_input, | |
| 539 CryptoUtils::CLIENT, &crypters, | |
| 540 nullptr /* subkey secret */)) { | |
| 541 *error_details = "Symmetric key setup failed"; | |
| 542 return QUIC_CRYPTO_SYMMETRIC_KEY_SETUP_FAILED; | |
| 543 } | |
| 544 | |
| 545 const QuicData& cetv_plaintext = cetv.GetSerialized(); | |
| 546 const size_t encrypted_len = | |
| 547 crypters.encrypter->GetCiphertextSize(cetv_plaintext.length()); | |
| 548 scoped_ptr<char[]> output(new char[encrypted_len]); | |
| 549 size_t output_size = 0; | |
| 550 if (!crypters.encrypter->EncryptPacket( | |
| 551 0 /* sequence number */, StringPiece() /* associated data */, | |
| 552 cetv_plaintext.AsStringPiece(), output.get(), &output_size, | |
| 553 encrypted_len)) { | |
| 554 *error_details = "Packet encryption failed"; | |
| 555 return QUIC_ENCRYPTION_FAILURE; | |
| 556 } | |
| 557 | |
| 558 out->SetStringPiece(kCETV, StringPiece(output.get(), output_size)); | |
| 559 out->MarkDirty(); | |
| 560 | |
| 561 out->set_minimum_size(orig_min_size); | |
| 562 } | |
| 563 | |
| 564 // Derive the symmetric keys and set up the encrypters and decrypters. | |
| 565 // Set the following members of out_params: | |
| 566 // out_params->hkdf_input_suffix | |
| 567 // out_params->initial_crypters | |
| 568 out_params->hkdf_input_suffix.clear(); | |
| 569 out_params->hkdf_input_suffix.append(reinterpret_cast<char*>(&connection_id), | |
| 570 sizeof(connection_id)); | |
| 571 const QuicData& client_hello_serialized = out->GetSerialized(); | |
| 572 out_params->hkdf_input_suffix.append(client_hello_serialized.data(), | |
| 573 client_hello_serialized.length()); | |
| 574 out_params->hkdf_input_suffix.append(cached->server_config()); | |
| 575 | |
| 576 string hkdf_input; | |
| 577 const size_t label_len = strlen(QuicCryptoConfig::kInitialLabel) + 1; | |
| 578 hkdf_input.reserve(label_len + out_params->hkdf_input_suffix.size()); | |
| 579 hkdf_input.append(QuicCryptoConfig::kInitialLabel, label_len); | |
| 580 hkdf_input.append(out_params->hkdf_input_suffix); | |
| 581 | |
| 582 if (!CryptoUtils::DeriveKeys( | |
| 583 out_params->initial_premaster_secret, out_params->aead, | |
| 584 out_params->client_nonce, out_params->server_nonce, hkdf_input, | |
| 585 CryptoUtils::CLIENT, &out_params->initial_crypters, | |
| 586 nullptr /* subkey secret */)) { | |
| 587 *error_details = "Symmetric key setup failed"; | |
| 588 return QUIC_CRYPTO_SYMMETRIC_KEY_SETUP_FAILED; | |
| 589 } | |
| 590 | |
| 591 return QUIC_NO_ERROR; | |
| 592 } | |
| 593 | |
| 594 QuicErrorCode QuicCryptoClientConfig::CacheNewServerConfig( | |
| 595 const CryptoHandshakeMessage& message, | |
| 596 QuicWallTime now, | |
| 597 const vector<string>& cached_certs, | |
| 598 CachedState* cached, | |
| 599 string* error_details) { | |
| 600 DCHECK(error_details != nullptr); | |
| 601 | |
| 602 StringPiece scfg; | |
| 603 if (!message.GetStringPiece(kSCFG, &scfg)) { | |
| 604 *error_details = "Missing SCFG"; | |
| 605 return QUIC_CRYPTO_MESSAGE_PARAMETER_NOT_FOUND; | |
| 606 } | |
| 607 | |
| 608 CachedState::ServerConfigState state = cached->SetServerConfig( | |
| 609 scfg, now, error_details); | |
| 610 if (state == CachedState::SERVER_CONFIG_EXPIRED) { | |
| 611 return QUIC_CRYPTO_SERVER_CONFIG_EXPIRED; | |
| 612 } | |
| 613 // TODO(rtenneti): Return more specific error code than returning | |
| 614 // QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER. | |
| 615 if (state != CachedState::SERVER_CONFIG_VALID) { | |
| 616 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 617 } | |
| 618 | |
| 619 StringPiece token; | |
| 620 if (message.GetStringPiece(kSourceAddressTokenTag, &token)) { | |
| 621 cached->set_source_address_token(token); | |
| 622 } | |
| 623 | |
| 624 StringPiece proof, cert_bytes; | |
| 625 bool has_proof = message.GetStringPiece(kPROF, &proof); | |
| 626 bool has_cert = message.GetStringPiece(kCertificateTag, &cert_bytes); | |
| 627 if (has_proof && has_cert) { | |
| 628 vector<string> certs; | |
| 629 if (!CertCompressor::DecompressChain(cert_bytes, cached_certs, | |
| 630 common_cert_sets, &certs)) { | |
| 631 *error_details = "Certificate data invalid"; | |
| 632 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 633 } | |
| 634 | |
| 635 cached->SetProof(certs, proof); | |
| 636 } else { | |
| 637 if (proof_verifier() != nullptr) { | |
| 638 // Secure QUIC: clear existing proof as we have been sent a new SCFG | |
| 639 // without matching proof/certs. | |
| 640 cached->ClearProof(); | |
| 641 } | |
| 642 | |
| 643 if (has_proof && !has_cert) { | |
| 644 *error_details = "Certificate missing"; | |
| 645 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 646 } | |
| 647 | |
| 648 if (!has_proof && has_cert) { | |
| 649 *error_details = "Proof missing"; | |
| 650 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 651 } | |
| 652 } | |
| 653 | |
| 654 return QUIC_NO_ERROR; | |
| 655 } | |
| 656 | |
| 657 QuicErrorCode QuicCryptoClientConfig::ProcessRejection( | |
| 658 const CryptoHandshakeMessage& rej, | |
| 659 QuicWallTime now, | |
| 660 CachedState* cached, | |
| 661 bool is_https, | |
| 662 QuicCryptoNegotiatedParameters* out_params, | |
| 663 string* error_details) { | |
| 664 DCHECK(error_details != nullptr); | |
| 665 | |
| 666 if (rej.tag() != kREJ) { | |
| 667 *error_details = "Message is not REJ"; | |
| 668 return QUIC_CRYPTO_INTERNAL_ERROR; | |
| 669 } | |
| 670 | |
| 671 QuicErrorCode error = CacheNewServerConfig(rej, now, out_params->cached_certs, | |
| 672 cached, error_details); | |
| 673 if (error != QUIC_NO_ERROR) { | |
| 674 return error; | |
| 675 } | |
| 676 | |
| 677 StringPiece nonce; | |
| 678 if (rej.GetStringPiece(kServerNonceTag, &nonce)) { | |
| 679 out_params->server_nonce = nonce.as_string(); | |
| 680 } | |
| 681 | |
| 682 const uint32* reject_reasons; | |
| 683 size_t num_reject_reasons; | |
| 684 static_assert(sizeof(QuicTag) == sizeof(uint32), "header out of sync"); | |
| 685 if (rej.GetTaglist(kRREJ, &reject_reasons, | |
| 686 &num_reject_reasons) == QUIC_NO_ERROR) { | |
| 687 uint32 packed_error = 0; | |
| 688 for (size_t i = 0; i < num_reject_reasons; ++i) { | |
| 689 // HANDSHAKE_OK is 0 and don't report that as error. | |
| 690 if (reject_reasons[i] == HANDSHAKE_OK || reject_reasons[i] >= 32) { | |
| 691 continue; | |
| 692 } | |
| 693 HandshakeFailureReason reason = | |
| 694 static_cast<HandshakeFailureReason>(reject_reasons[i]); | |
| 695 packed_error |= 1 << (reason - 1); | |
| 696 } | |
| 697 DVLOG(1) << "Reasons for rejection: " << packed_error; | |
| 698 if (is_https) { | |
| 699 UMA_HISTOGRAM_SPARSE_SLOWLY("Net.QuicClientHelloRejectReasons.Secure", | |
| 700 packed_error); | |
| 701 } else { | |
| 702 UMA_HISTOGRAM_SPARSE_SLOWLY("Net.QuicClientHelloRejectReasons.Insecure", | |
| 703 packed_error); | |
| 704 } | |
| 705 } | |
| 706 | |
| 707 return QUIC_NO_ERROR; | |
| 708 } | |
| 709 | |
| 710 QuicErrorCode QuicCryptoClientConfig::ProcessServerHello( | |
| 711 const CryptoHandshakeMessage& server_hello, | |
| 712 QuicConnectionId connection_id, | |
| 713 const QuicVersionVector& negotiated_versions, | |
| 714 CachedState* cached, | |
| 715 QuicCryptoNegotiatedParameters* out_params, | |
| 716 string* error_details) { | |
| 717 DCHECK(error_details != nullptr); | |
| 718 | |
| 719 if (server_hello.tag() != kSHLO) { | |
| 720 *error_details = "Bad tag"; | |
| 721 return QUIC_INVALID_CRYPTO_MESSAGE_TYPE; | |
| 722 } | |
| 723 | |
| 724 const QuicTag* supported_version_tags; | |
| 725 size_t num_supported_versions; | |
| 726 | |
| 727 if (server_hello.GetTaglist(kVER, &supported_version_tags, | |
| 728 &num_supported_versions) != QUIC_NO_ERROR) { | |
| 729 *error_details = "server hello missing version list"; | |
| 730 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 731 } | |
| 732 if (!negotiated_versions.empty()) { | |
| 733 bool mismatch = num_supported_versions != negotiated_versions.size(); | |
| 734 for (size_t i = 0; i < num_supported_versions && !mismatch; ++i) { | |
| 735 mismatch = QuicTagToQuicVersion(supported_version_tags[i]) != | |
| 736 negotiated_versions[i]; | |
| 737 } | |
| 738 // The server sent a list of supported versions, and the connection | |
| 739 // reports that there was a version negotiation during the handshake. | |
| 740 // Ensure that these two lists are identical. | |
| 741 if (mismatch) { | |
| 742 *error_details = "Downgrade attack detected"; | |
| 743 return QUIC_VERSION_NEGOTIATION_MISMATCH; | |
| 744 } | |
| 745 } | |
| 746 | |
| 747 // Learn about updated source address tokens. | |
| 748 StringPiece token; | |
| 749 if (server_hello.GetStringPiece(kSourceAddressTokenTag, &token)) { | |
| 750 cached->set_source_address_token(token); | |
| 751 } | |
| 752 | |
| 753 // TODO(agl): | |
| 754 // learn about updated SCFGs. | |
| 755 | |
| 756 StringPiece public_value; | |
| 757 if (!server_hello.GetStringPiece(kPUBS, &public_value)) { | |
| 758 *error_details = "server hello missing forward secure public value"; | |
| 759 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 760 } | |
| 761 | |
| 762 if (!out_params->client_key_exchange->CalculateSharedKey( | |
| 763 public_value, &out_params->forward_secure_premaster_secret)) { | |
| 764 *error_details = "Key exchange failure"; | |
| 765 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 766 } | |
| 767 | |
| 768 string hkdf_input; | |
| 769 const size_t label_len = strlen(QuicCryptoConfig::kForwardSecureLabel) + 1; | |
| 770 hkdf_input.reserve(label_len + out_params->hkdf_input_suffix.size()); | |
| 771 hkdf_input.append(QuicCryptoConfig::kForwardSecureLabel, label_len); | |
| 772 hkdf_input.append(out_params->hkdf_input_suffix); | |
| 773 | |
| 774 if (!CryptoUtils::DeriveKeys( | |
| 775 out_params->forward_secure_premaster_secret, out_params->aead, | |
| 776 out_params->client_nonce, out_params->server_nonce, hkdf_input, | |
| 777 CryptoUtils::CLIENT, &out_params->forward_secure_crypters, | |
| 778 &out_params->subkey_secret)) { | |
| 779 *error_details = "Symmetric key setup failed"; | |
| 780 return QUIC_CRYPTO_SYMMETRIC_KEY_SETUP_FAILED; | |
| 781 } | |
| 782 | |
| 783 return QUIC_NO_ERROR; | |
| 784 } | |
| 785 | |
| 786 QuicErrorCode QuicCryptoClientConfig::ProcessServerConfigUpdate( | |
| 787 const CryptoHandshakeMessage& server_config_update, | |
| 788 QuicWallTime now, | |
| 789 CachedState* cached, | |
| 790 QuicCryptoNegotiatedParameters* out_params, | |
| 791 string* error_details) { | |
| 792 DCHECK(error_details != nullptr); | |
| 793 | |
| 794 if (server_config_update.tag() != kSCUP) { | |
| 795 *error_details = "ServerConfigUpdate must have kSCUP tag."; | |
| 796 return QUIC_INVALID_CRYPTO_MESSAGE_TYPE; | |
| 797 } | |
| 798 | |
| 799 return CacheNewServerConfig(server_config_update, now, | |
| 800 out_params->cached_certs, cached, error_details); | |
| 801 } | |
| 802 | |
| 803 ProofVerifier* QuicCryptoClientConfig::proof_verifier() const { | |
| 804 return proof_verifier_.get(); | |
| 805 } | |
| 806 | |
| 807 void QuicCryptoClientConfig::SetProofVerifier(ProofVerifier* verifier) { | |
| 808 proof_verifier_.reset(verifier); | |
| 809 } | |
| 810 | |
| 811 ChannelIDSource* QuicCryptoClientConfig::channel_id_source() const { | |
| 812 return channel_id_source_.get(); | |
| 813 } | |
| 814 | |
| 815 void QuicCryptoClientConfig::SetChannelIDSource(ChannelIDSource* source) { | |
| 816 channel_id_source_.reset(source); | |
| 817 } | |
| 818 | |
| 819 void QuicCryptoClientConfig::InitializeFrom( | |
| 820 const QuicServerId& server_id, | |
| 821 const QuicServerId& canonical_server_id, | |
| 822 QuicCryptoClientConfig* canonical_crypto_config) { | |
| 823 CachedState* canonical_cached = | |
| 824 canonical_crypto_config->LookupOrCreate(canonical_server_id); | |
| 825 if (!canonical_cached->proof_valid()) { | |
| 826 return; | |
| 827 } | |
| 828 CachedState* cached = LookupOrCreate(server_id); | |
| 829 cached->InitializeFrom(*canonical_cached); | |
| 830 } | |
| 831 | |
| 832 void QuicCryptoClientConfig::AddCanonicalSuffix(const string& suffix) { | |
| 833 canonical_suffixes_.push_back(suffix); | |
| 834 } | |
| 835 | |
| 836 void QuicCryptoClientConfig::PreferAesGcm() { | |
| 837 DCHECK(!aead.empty()); | |
| 838 if (aead.size() <= 1) { | |
| 839 return; | |
| 840 } | |
| 841 QuicTagVector::iterator pos = std::find(aead.begin(), aead.end(), kAESG); | |
| 842 if (pos != aead.end()) { | |
| 843 aead.erase(pos); | |
| 844 aead.insert(aead.begin(), kAESG); | |
| 845 } | |
| 846 } | |
| 847 | |
| 848 void QuicCryptoClientConfig::DisableEcdsa() { | |
| 849 disable_ecdsa_ = true; | |
| 850 } | |
| 851 | |
| 852 bool QuicCryptoClientConfig::PopulateFromCanonicalConfig( | |
| 853 const QuicServerId& server_id, | |
| 854 CachedState* server_state) { | |
| 855 DCHECK(server_state->IsEmpty()); | |
| 856 size_t i = 0; | |
| 857 for (; i < canonical_suffixes_.size(); ++i) { | |
| 858 if (EndsWith(server_id.host(), canonical_suffixes_[i], false)) { | |
| 859 break; | |
| 860 } | |
| 861 } | |
| 862 if (i == canonical_suffixes_.size()) { | |
| 863 return false; | |
| 864 } | |
| 865 | |
| 866 QuicServerId suffix_server_id(canonical_suffixes_[i], server_id.port(), | |
| 867 server_id.is_https(), | |
| 868 server_id.privacy_mode()); | |
| 869 if (!ContainsKey(canonical_server_map_, suffix_server_id)) { | |
| 870 // This is the first host we've seen which matches the suffix, so make it | |
| 871 // canonical. | |
| 872 canonical_server_map_[suffix_server_id] = server_id; | |
| 873 return false; | |
| 874 } | |
| 875 | |
| 876 const QuicServerId& canonical_server_id = | |
| 877 canonical_server_map_[suffix_server_id]; | |
| 878 CachedState* canonical_state = cached_states_[canonical_server_id]; | |
| 879 if (!canonical_state->proof_valid()) { | |
| 880 return false; | |
| 881 } | |
| 882 | |
| 883 // Update canonical version to point at the "most recent" entry. | |
| 884 canonical_server_map_[suffix_server_id] = server_id; | |
| 885 | |
| 886 server_state->InitializeFrom(*canonical_state); | |
| 887 return true; | |
| 888 } | |
| 889 | |
| 890 } // namespace net | |
| OLD | NEW |
|---|
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