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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 <memory> | |
| 8 | |
| 9 #include "base/metrics/histogram_macros.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/crypto/quic_random.h" | |
| 24 #include "net/quic/quic_bug_tracker.h" | |
| 25 #include "net/quic/quic_flags.h" | |
| 26 #include "net/quic/quic_utils.h" | |
| 27 | |
| 28 using base::StringPiece; | |
| 29 using std::map; | |
| 30 using std::string; | |
| 31 using std::queue; | |
| 32 using std::vector; | |
| 33 | |
| 34 namespace net { | |
| 35 | |
| 36 namespace { | |
| 37 | |
| 38 // Tracks the reason (the state of the server config) for sending inchoate | |
| 39 // ClientHello to the server. | |
| 40 void RecordInchoateClientHelloReason( | |
| 41 QuicCryptoClientConfig::CachedState::ServerConfigState state) { | |
| 42 UMA_HISTOGRAM_ENUMERATION( | |
| 43 "Net.QuicInchoateClientHelloReason", state, | |
| 44 QuicCryptoClientConfig::CachedState::SERVER_CONFIG_COUNT); | |
| 45 } | |
| 46 | |
| 47 // Tracks the state of the QUIC server information loaded from the disk cache. | |
| 48 void RecordDiskCacheServerConfigState( | |
| 49 QuicCryptoClientConfig::CachedState::ServerConfigState state) { | |
| 50 UMA_HISTOGRAM_ENUMERATION( | |
| 51 "Net.QuicServerInfo.DiskCacheState", state, | |
| 52 QuicCryptoClientConfig::CachedState::SERVER_CONFIG_COUNT); | |
| 53 } | |
| 54 | |
| 55 } // namespace | |
| 56 | |
| 57 QuicCryptoClientConfig::QuicCryptoClientConfig( | |
| 58 std::unique_ptr<ProofVerifier> proof_verifier) | |
| 59 : proof_verifier_(std::move(proof_verifier)), disable_ecdsa_(false) { | |
| 60 DCHECK(proof_verifier_.get()); | |
| 61 SetDefaults(); | |
| 62 } | |
| 63 | |
| 64 QuicCryptoClientConfig::~QuicCryptoClientConfig() { | |
| 65 STLDeleteValues(&cached_states_); | |
| 66 } | |
| 67 | |
| 68 QuicCryptoClientConfig::CachedState::CachedState() | |
| 69 : server_config_valid_(false), generation_counter_(0) {} | |
| 70 | |
| 71 QuicCryptoClientConfig::CachedState::~CachedState() {} | |
| 72 | |
| 73 bool QuicCryptoClientConfig::CachedState::IsComplete(QuicWallTime now) const { | |
| 74 if (server_config_.empty()) { | |
| 75 RecordInchoateClientHelloReason(SERVER_CONFIG_EMPTY); | |
| 76 return false; | |
| 77 } | |
| 78 | |
| 79 if (!server_config_valid_) { | |
| 80 RecordInchoateClientHelloReason(SERVER_CONFIG_INVALID); | |
| 81 return false; | |
| 82 } | |
| 83 | |
| 84 const CryptoHandshakeMessage* scfg = GetServerConfig(); | |
| 85 if (!scfg) { | |
| 86 // Should be impossible short of cache corruption. | |
| 87 DCHECK(false); | |
| 88 RecordInchoateClientHelloReason(SERVER_CONFIG_CORRUPTED); | |
| 89 return false; | |
| 90 } | |
| 91 | |
| 92 uint64_t expiry_seconds; | |
| 93 if (scfg->GetUint64(kEXPY, &expiry_seconds) != QUIC_NO_ERROR) { | |
| 94 RecordInchoateClientHelloReason(SERVER_CONFIG_INVALID_EXPIRY); | |
| 95 return false; | |
| 96 } | |
| 97 if (now.ToUNIXSeconds() >= expiry_seconds) { | |
| 98 UMA_HISTOGRAM_CUSTOM_TIMES( | |
| 99 "Net.QuicClientHelloServerConfig.InvalidDuration", | |
| 100 base::TimeDelta::FromSeconds(now.ToUNIXSeconds() - expiry_seconds), | |
| 101 base::TimeDelta::FromMinutes(1), base::TimeDelta::FromDays(20), 50); | |
| 102 RecordInchoateClientHelloReason(SERVER_CONFIG_EXPIRED); | |
| 103 return false; | |
| 104 } | |
| 105 | |
| 106 return true; | |
| 107 } | |
| 108 | |
| 109 bool QuicCryptoClientConfig::CachedState::IsEmpty() const { | |
| 110 return server_config_.empty(); | |
| 111 } | |
| 112 | |
| 113 const CryptoHandshakeMessage* | |
| 114 QuicCryptoClientConfig::CachedState::GetServerConfig() const { | |
| 115 if (server_config_.empty()) { | |
| 116 return nullptr; | |
| 117 } | |
| 118 | |
| 119 if (!scfg_.get()) { | |
| 120 scfg_.reset(CryptoFramer::ParseMessage(server_config_)); | |
| 121 DCHECK(scfg_.get()); | |
| 122 } | |
| 123 return scfg_.get(); | |
| 124 } | |
| 125 | |
| 126 void QuicCryptoClientConfig::CachedState::add_server_designated_connection_id( | |
| 127 QuicConnectionId connection_id) { | |
| 128 server_designated_connection_ids_.push(connection_id); | |
| 129 } | |
| 130 | |
| 131 bool QuicCryptoClientConfig::CachedState::has_server_designated_connection_id() | |
| 132 const { | |
| 133 return !server_designated_connection_ids_.empty(); | |
| 134 } | |
| 135 | |
| 136 void QuicCryptoClientConfig::CachedState::add_server_nonce( | |
| 137 const string& server_nonce) { | |
| 138 server_nonces_.push(server_nonce); | |
| 139 } | |
| 140 | |
| 141 bool QuicCryptoClientConfig::CachedState::has_server_nonce() const { | |
| 142 return !server_nonces_.empty(); | |
| 143 } | |
| 144 | |
| 145 QuicCryptoClientConfig::CachedState::ServerConfigState | |
| 146 QuicCryptoClientConfig::CachedState::SetServerConfig(StringPiece server_config, | |
| 147 QuicWallTime now, | |
| 148 string* error_details) { | |
| 149 const bool matches_existing = server_config == server_config_; | |
| 150 | |
| 151 // Even if the new server config matches the existing one, we still wish to | |
| 152 // reject it if it has expired. | |
| 153 std::unique_ptr<CryptoHandshakeMessage> new_scfg_storage; | |
| 154 const CryptoHandshakeMessage* new_scfg; | |
| 155 | |
| 156 if (!matches_existing) { | |
| 157 new_scfg_storage.reset(CryptoFramer::ParseMessage(server_config)); | |
| 158 new_scfg = new_scfg_storage.get(); | |
| 159 } else { | |
| 160 new_scfg = GetServerConfig(); | |
| 161 } | |
| 162 | |
| 163 if (!new_scfg) { | |
| 164 *error_details = "SCFG invalid"; | |
| 165 return SERVER_CONFIG_INVALID; | |
| 166 } | |
| 167 | |
| 168 uint64_t expiry_seconds; | |
| 169 if (new_scfg->GetUint64(kEXPY, &expiry_seconds) != QUIC_NO_ERROR) { | |
| 170 *error_details = "SCFG missing EXPY"; | |
| 171 return SERVER_CONFIG_INVALID_EXPIRY; | |
| 172 } | |
| 173 | |
| 174 if (now.ToUNIXSeconds() >= expiry_seconds) { | |
| 175 *error_details = "SCFG has expired"; | |
| 176 return SERVER_CONFIG_EXPIRED; | |
| 177 } | |
| 178 | |
| 179 if (!matches_existing) { | |
| 180 server_config_ = server_config.as_string(); | |
| 181 SetProofInvalid(); | |
| 182 scfg_.reset(new_scfg_storage.release()); | |
| 183 } | |
| 184 return SERVER_CONFIG_VALID; | |
| 185 } | |
| 186 | |
| 187 void QuicCryptoClientConfig::CachedState::InvalidateServerConfig() { | |
| 188 server_config_.clear(); | |
| 189 scfg_.reset(); | |
| 190 SetProofInvalid(); | |
| 191 queue<QuicConnectionId> empty_queue; | |
| 192 swap(server_designated_connection_ids_, empty_queue); | |
| 193 } | |
| 194 | |
| 195 void QuicCryptoClientConfig::CachedState::SetProof(const vector<string>& certs, | |
| 196 StringPiece cert_sct, | |
| 197 StringPiece chlo_hash, | |
| 198 StringPiece signature) { | |
| 199 bool has_changed = signature != server_config_sig_ || | |
| 200 chlo_hash != chlo_hash_ || certs_.size() != certs.size(); | |
| 201 | |
| 202 if (!has_changed) { | |
| 203 for (size_t i = 0; i < certs_.size(); i++) { | |
| 204 if (certs_[i] != certs[i]) { | |
| 205 has_changed = true; | |
| 206 break; | |
| 207 } | |
| 208 } | |
| 209 } | |
| 210 | |
| 211 if (!has_changed) { | |
| 212 return; | |
| 213 } | |
| 214 | |
| 215 // If the proof has changed then it needs to be revalidated. | |
| 216 SetProofInvalid(); | |
| 217 certs_ = certs; | |
| 218 cert_sct_ = cert_sct.as_string(); | |
| 219 chlo_hash_ = chlo_hash.as_string(); | |
| 220 server_config_sig_ = signature.as_string(); | |
| 221 } | |
| 222 | |
| 223 void QuicCryptoClientConfig::CachedState::Clear() { | |
| 224 server_config_.clear(); | |
| 225 source_address_token_.clear(); | |
| 226 certs_.clear(); | |
| 227 cert_sct_.clear(); | |
| 228 chlo_hash_.clear(); | |
| 229 server_config_sig_.clear(); | |
| 230 server_config_valid_ = false; | |
| 231 proof_verify_details_.reset(); | |
| 232 scfg_.reset(); | |
| 233 ++generation_counter_; | |
| 234 queue<QuicConnectionId> empty_queue; | |
| 235 swap(server_designated_connection_ids_, empty_queue); | |
| 236 } | |
| 237 | |
| 238 void QuicCryptoClientConfig::CachedState::ClearProof() { | |
| 239 SetProofInvalid(); | |
| 240 certs_.clear(); | |
| 241 cert_sct_.clear(); | |
| 242 chlo_hash_.clear(); | |
| 243 server_config_sig_.clear(); | |
| 244 } | |
| 245 | |
| 246 void QuicCryptoClientConfig::CachedState::SetProofValid() { | |
| 247 server_config_valid_ = true; | |
| 248 } | |
| 249 | |
| 250 void QuicCryptoClientConfig::CachedState::SetProofInvalid() { | |
| 251 server_config_valid_ = false; | |
| 252 ++generation_counter_; | |
| 253 } | |
| 254 | |
| 255 bool QuicCryptoClientConfig::CachedState::Initialize( | |
| 256 StringPiece server_config, | |
| 257 StringPiece source_address_token, | |
| 258 const vector<string>& certs, | |
| 259 StringPiece cert_sct, | |
| 260 StringPiece chlo_hash, | |
| 261 StringPiece signature, | |
| 262 QuicWallTime now) { | |
| 263 DCHECK(server_config_.empty()); | |
| 264 | |
| 265 if (server_config.empty()) { | |
| 266 RecordDiskCacheServerConfigState(SERVER_CONFIG_EMPTY); | |
| 267 return false; | |
| 268 } | |
| 269 | |
| 270 string error_details; | |
| 271 ServerConfigState state = SetServerConfig(server_config, now, &error_details); | |
| 272 RecordDiskCacheServerConfigState(state); | |
| 273 if (state != SERVER_CONFIG_VALID) { | |
| 274 DVLOG(1) << "SetServerConfig failed with " << error_details; | |
| 275 return false; | |
| 276 } | |
| 277 | |
| 278 signature.CopyToString(&server_config_sig_); | |
| 279 source_address_token.CopyToString(&source_address_token_); | |
| 280 cert_sct.CopyToString(&cert_sct_); | |
| 281 chlo_hash.CopyToString(&chlo_hash_); | |
| 282 certs_ = certs; | |
| 283 return true; | |
| 284 } | |
| 285 | |
| 286 const string& QuicCryptoClientConfig::CachedState::server_config() const { | |
| 287 return server_config_; | |
| 288 } | |
| 289 | |
| 290 const string& QuicCryptoClientConfig::CachedState::source_address_token() | |
| 291 const { | |
| 292 return source_address_token_; | |
| 293 } | |
| 294 | |
| 295 const vector<string>& QuicCryptoClientConfig::CachedState::certs() const { | |
| 296 return certs_; | |
| 297 } | |
| 298 | |
| 299 const string& QuicCryptoClientConfig::CachedState::cert_sct() const { | |
| 300 return cert_sct_; | |
| 301 } | |
| 302 | |
| 303 const string& QuicCryptoClientConfig::CachedState::chlo_hash() const { | |
| 304 return chlo_hash_; | |
| 305 } | |
| 306 | |
| 307 const string& QuicCryptoClientConfig::CachedState::signature() const { | |
| 308 return server_config_sig_; | |
| 309 } | |
| 310 | |
| 311 bool QuicCryptoClientConfig::CachedState::proof_valid() const { | |
| 312 return server_config_valid_; | |
| 313 } | |
| 314 | |
| 315 uint64_t QuicCryptoClientConfig::CachedState::generation_counter() const { | |
| 316 return generation_counter_; | |
| 317 } | |
| 318 | |
| 319 const ProofVerifyDetails* | |
| 320 QuicCryptoClientConfig::CachedState::proof_verify_details() const { | |
| 321 return proof_verify_details_.get(); | |
| 322 } | |
| 323 | |
| 324 void QuicCryptoClientConfig::CachedState::set_source_address_token( | |
| 325 StringPiece token) { | |
| 326 source_address_token_ = token.as_string(); | |
| 327 } | |
| 328 | |
| 329 void QuicCryptoClientConfig::CachedState::set_cert_sct(StringPiece cert_sct) { | |
| 330 cert_sct_ = cert_sct.as_string(); | |
| 331 } | |
| 332 | |
| 333 void QuicCryptoClientConfig::CachedState::SetProofVerifyDetails( | |
| 334 ProofVerifyDetails* details) { | |
| 335 proof_verify_details_.reset(details); | |
| 336 } | |
| 337 | |
| 338 void QuicCryptoClientConfig::CachedState::InitializeFrom( | |
| 339 const QuicCryptoClientConfig::CachedState& other) { | |
| 340 DCHECK(server_config_.empty()); | |
| 341 DCHECK(!server_config_valid_); | |
| 342 server_config_ = other.server_config_; | |
| 343 source_address_token_ = other.source_address_token_; | |
| 344 certs_ = other.certs_; | |
| 345 cert_sct_ = other.cert_sct_; | |
| 346 chlo_hash_ = other.chlo_hash_; | |
| 347 server_config_sig_ = other.server_config_sig_; | |
| 348 server_config_valid_ = other.server_config_valid_; | |
| 349 server_designated_connection_ids_ = other.server_designated_connection_ids_; | |
| 350 if (other.proof_verify_details_.get() != nullptr) { | |
| 351 proof_verify_details_.reset(other.proof_verify_details_->Clone()); | |
| 352 } | |
| 353 ++generation_counter_; | |
| 354 } | |
| 355 | |
| 356 QuicConnectionId | |
| 357 QuicCryptoClientConfig::CachedState::GetNextServerDesignatedConnectionId() { | |
| 358 if (server_designated_connection_ids_.empty()) { | |
| 359 QUIC_BUG | |
| 360 << "Attempting to consume a connection id that was never designated."; | |
| 361 return 0; | |
| 362 } | |
| 363 const QuicConnectionId next_id = server_designated_connection_ids_.front(); | |
| 364 server_designated_connection_ids_.pop(); | |
| 365 return next_id; | |
| 366 } | |
| 367 | |
| 368 string QuicCryptoClientConfig::CachedState::GetNextServerNonce() { | |
| 369 if (server_nonces_.empty()) { | |
| 370 QUIC_BUG | |
| 371 << "Attempting to consume a server nonce that was never designated."; | |
| 372 return ""; | |
| 373 } | |
| 374 const string server_nonce = server_nonces_.front(); | |
| 375 server_nonces_.pop(); | |
| 376 return server_nonce; | |
| 377 } | |
| 378 | |
| 379 void QuicCryptoClientConfig::SetDefaults() { | |
| 380 // Key exchange methods. | |
| 381 kexs = {kC255, kP256}; | |
| 382 | |
| 383 // Authenticated encryption algorithms. Prefer RFC 7539 ChaCha20 by default. | |
| 384 aead = {kCC20, kAESG}; | |
| 385 | |
| 386 disable_ecdsa_ = false; | |
| 387 } | |
| 388 | |
| 389 QuicCryptoClientConfig::CachedState* QuicCryptoClientConfig::LookupOrCreate( | |
| 390 const QuicServerId& server_id) { | |
| 391 CachedStateMap::const_iterator it = cached_states_.find(server_id); | |
| 392 if (it != cached_states_.end()) { | |
| 393 return it->second; | |
| 394 } | |
| 395 | |
| 396 CachedState* cached = new CachedState; | |
| 397 cached_states_.insert(std::make_pair(server_id, cached)); | |
| 398 bool cache_populated = PopulateFromCanonicalConfig(server_id, cached); | |
| 399 UMA_HISTOGRAM_BOOLEAN( | |
| 400 "Net.QuicCryptoClientConfig.PopulatedFromCanonicalConfig", | |
| 401 cache_populated); | |
| 402 return cached; | |
| 403 } | |
| 404 | |
| 405 void QuicCryptoClientConfig::ClearCachedStates() { | |
| 406 for (CachedStateMap::const_iterator it = cached_states_.begin(); | |
| 407 it != cached_states_.end(); ++it) { | |
| 408 it->second->Clear(); | |
| 409 } | |
| 410 } | |
| 411 | |
| 412 void QuicCryptoClientConfig::FillInchoateClientHello( | |
| 413 const QuicServerId& server_id, | |
| 414 const QuicVersion preferred_version, | |
| 415 const CachedState* cached, | |
| 416 QuicRandom* rand, | |
| 417 bool demand_x509_proof, | |
| 418 QuicCryptoNegotiatedParameters* out_params, | |
| 419 CryptoHandshakeMessage* out) const { | |
| 420 out->set_tag(kCHLO); | |
| 421 out->set_minimum_size(kClientHelloMinimumSize); | |
| 422 | |
| 423 // Server name indication. We only send SNI if it's a valid domain name, as | |
| 424 // per the spec. | |
| 425 if (CryptoUtils::IsValidSNI(server_id.host())) { | |
| 426 out->SetStringPiece(kSNI, server_id.host()); | |
| 427 } | |
| 428 out->SetValue(kVER, QuicVersionToQuicTag(preferred_version)); | |
| 429 | |
| 430 if (!user_agent_id_.empty()) { | |
| 431 out->SetStringPiece(kUAID, user_agent_id_); | |
| 432 } | |
| 433 | |
| 434 // Even though this is an inchoate CHLO, send the SCID so that | |
| 435 // the STK can be validated by the server. | |
| 436 const CryptoHandshakeMessage* scfg = cached->GetServerConfig(); | |
| 437 if (scfg != nullptr) { | |
| 438 StringPiece scid; | |
| 439 if (scfg->GetStringPiece(kSCID, &scid)) { | |
| 440 out->SetStringPiece(kSCID, scid); | |
| 441 } | |
| 442 } | |
| 443 | |
| 444 if (!cached->source_address_token().empty()) { | |
| 445 out->SetStringPiece(kSourceAddressTokenTag, cached->source_address_token()); | |
| 446 } | |
| 447 | |
| 448 if (!demand_x509_proof) { | |
| 449 return; | |
| 450 } | |
| 451 | |
| 452 char proof_nonce[32]; | |
| 453 rand->RandBytes(proof_nonce, arraysize(proof_nonce)); | |
| 454 out->SetStringPiece(kNONP, StringPiece(proof_nonce, arraysize(proof_nonce))); | |
| 455 | |
| 456 if (disable_ecdsa_) { | |
| 457 out->SetVector(kPDMD, QuicTagVector{kX59R}); | |
| 458 } else { | |
| 459 out->SetVector(kPDMD, QuicTagVector{kX509}); | |
| 460 } | |
| 461 | |
| 462 if (common_cert_sets) { | |
| 463 out->SetStringPiece(kCCS, common_cert_sets->GetCommonHashes()); | |
| 464 } | |
| 465 | |
| 466 out->SetStringPiece(kCertificateSCTTag, ""); | |
| 467 | |
| 468 const vector<string>& certs = cached->certs(); | |
| 469 // We save |certs| in the QuicCryptoNegotiatedParameters so that, if the | |
| 470 // client config is being used for multiple connections, another connection | |
| 471 // doesn't update the cached certificates and cause us to be unable to | |
| 472 // process the server's compressed certificate chain. | |
| 473 out_params->cached_certs = certs; | |
| 474 if (!certs.empty()) { | |
| 475 vector<uint64_t> hashes; | |
| 476 hashes.reserve(certs.size()); | |
| 477 for (vector<string>::const_iterator i = certs.begin(); i != certs.end(); | |
| 478 ++i) { | |
| 479 hashes.push_back(QuicUtils::FNV1a_64_Hash(i->data(), i->size())); | |
| 480 } | |
| 481 out->SetVector(kCCRT, hashes); | |
| 482 } | |
| 483 } | |
| 484 | |
| 485 QuicErrorCode QuicCryptoClientConfig::FillClientHello( | |
| 486 const QuicServerId& server_id, | |
| 487 QuicConnectionId connection_id, | |
| 488 const QuicVersion actual_version, | |
| 489 const QuicVersion preferred_version, | |
| 490 const CachedState* cached, | |
| 491 QuicWallTime now, | |
| 492 QuicRandom* rand, | |
| 493 const ChannelIDKey* channel_id_key, | |
| 494 QuicCryptoNegotiatedParameters* out_params, | |
| 495 CryptoHandshakeMessage* out, | |
| 496 string* error_details) const { | |
| 497 DCHECK(error_details != nullptr); | |
| 498 | |
| 499 FillInchoateClientHello(server_id, preferred_version, cached, rand, | |
| 500 /* demand_x509_proof= */ true, out_params, out); | |
| 501 | |
| 502 const CryptoHandshakeMessage* scfg = cached->GetServerConfig(); | |
| 503 if (!scfg) { | |
| 504 // This should never happen as our caller should have checked | |
| 505 // cached->IsComplete() before calling this function. | |
| 506 *error_details = "Handshake not ready"; | |
| 507 return QUIC_CRYPTO_INTERNAL_ERROR; | |
| 508 } | |
| 509 | |
| 510 StringPiece scid; | |
| 511 if (!scfg->GetStringPiece(kSCID, &scid)) { | |
| 512 *error_details = "SCFG missing SCID"; | |
| 513 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 514 } | |
| 515 out->SetStringPiece(kSCID, scid); | |
| 516 | |
| 517 out->SetStringPiece(kCertificateSCTTag, ""); | |
| 518 | |
| 519 const QuicTag* their_aeads; | |
| 520 const QuicTag* their_key_exchanges; | |
| 521 size_t num_their_aeads, num_their_key_exchanges; | |
| 522 if (scfg->GetTaglist(kAEAD, &their_aeads, &num_their_aeads) != | |
| 523 QUIC_NO_ERROR || | |
| 524 scfg->GetTaglist(kKEXS, &their_key_exchanges, &num_their_key_exchanges) != | |
| 525 QUIC_NO_ERROR) { | |
| 526 *error_details = "Missing AEAD or KEXS"; | |
| 527 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 528 } | |
| 529 | |
| 530 // AEAD: the work loads on the client and server are symmetric. Since the | |
| 531 // client is more likely to be CPU-constrained, break the tie by favoring | |
| 532 // the client's preference. | |
| 533 // Key exchange: the client does more work than the server, so favor the | |
| 534 // client's preference. | |
| 535 size_t key_exchange_index; | |
| 536 if (!QuicUtils::FindMutualTag(aead, their_aeads, num_their_aeads, | |
| 537 QuicUtils::LOCAL_PRIORITY, &out_params->aead, | |
| 538 nullptr) || | |
| 539 !QuicUtils::FindMutualTag( | |
| 540 kexs, their_key_exchanges, num_their_key_exchanges, | |
| 541 QuicUtils::LOCAL_PRIORITY, &out_params->key_exchange, | |
| 542 &key_exchange_index)) { | |
| 543 *error_details = "Unsupported AEAD or KEXS"; | |
| 544 return QUIC_CRYPTO_NO_SUPPORT; | |
| 545 } | |
| 546 out->SetVector(kAEAD, QuicTagVector{out_params->aead}); | |
| 547 out->SetVector(kKEXS, QuicTagVector{out_params->key_exchange}); | |
| 548 | |
| 549 if (!tb_key_params.empty()) { | |
| 550 const QuicTag* their_tbkps; | |
| 551 size_t num_their_tbkps; | |
| 552 switch (scfg->GetTaglist(kTBKP, &their_tbkps, &num_their_tbkps)) { | |
| 553 case QUIC_CRYPTO_MESSAGE_PARAMETER_NOT_FOUND: | |
| 554 break; | |
| 555 case QUIC_NO_ERROR: | |
| 556 if (QuicUtils::FindMutualTag(tb_key_params, their_tbkps, | |
| 557 num_their_tbkps, QuicUtils::LOCAL_PRIORITY, | |
| 558 &out_params->token_binding_key_param, | |
| 559 nullptr)) { | |
| 560 out->SetVector(kTBKP, | |
| 561 QuicTagVector{out_params->token_binding_key_param}); | |
| 562 } | |
| 563 break; | |
| 564 default: | |
| 565 *error_details = "Invalid TBKP"; | |
| 566 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 567 } | |
| 568 } | |
| 569 | |
| 570 StringPiece public_value; | |
| 571 if (scfg->GetNthValue24(kPUBS, key_exchange_index, &public_value) != | |
| 572 QUIC_NO_ERROR) { | |
| 573 *error_details = "Missing public value"; | |
| 574 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 575 } | |
| 576 | |
| 577 StringPiece orbit; | |
| 578 if (!scfg->GetStringPiece(kORBT, &orbit) || orbit.size() != kOrbitSize) { | |
| 579 *error_details = "SCFG missing OBIT"; | |
| 580 return QUIC_CRYPTO_MESSAGE_PARAMETER_NOT_FOUND; | |
| 581 } | |
| 582 | |
| 583 CryptoUtils::GenerateNonce(now, rand, orbit, &out_params->client_nonce); | |
| 584 out->SetStringPiece(kNONC, out_params->client_nonce); | |
| 585 if (!out_params->server_nonce.empty()) { | |
| 586 out->SetStringPiece(kServerNonceTag, out_params->server_nonce); | |
| 587 } | |
| 588 | |
| 589 switch (out_params->key_exchange) { | |
| 590 case kC255: | |
| 591 out_params->client_key_exchange.reset(Curve25519KeyExchange::New( | |
| 592 Curve25519KeyExchange::NewPrivateKey(rand))); | |
| 593 break; | |
| 594 case kP256: | |
| 595 out_params->client_key_exchange.reset( | |
| 596 P256KeyExchange::New(P256KeyExchange::NewPrivateKey())); | |
| 597 break; | |
| 598 default: | |
| 599 DCHECK(false); | |
| 600 *error_details = "Configured to support an unknown key exchange"; | |
| 601 return QUIC_CRYPTO_INTERNAL_ERROR; | |
| 602 } | |
| 603 | |
| 604 if (!out_params->client_key_exchange->CalculateSharedKey( | |
| 605 public_value, &out_params->initial_premaster_secret)) { | |
| 606 *error_details = "Key exchange failure"; | |
| 607 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 608 } | |
| 609 out->SetStringPiece(kPUBS, out_params->client_key_exchange->public_value()); | |
| 610 | |
| 611 const vector<string>& certs = cached->certs(); | |
| 612 if (certs.empty()) { | |
| 613 *error_details = "No certs to calculate XLCT"; | |
| 614 return QUIC_CRYPTO_INTERNAL_ERROR; | |
| 615 } | |
| 616 out->SetValue(kXLCT, CryptoUtils::ComputeLeafCertHash(certs[0])); | |
| 617 | |
| 618 if (channel_id_key) { | |
| 619 // In order to calculate the encryption key for the CETV block we need to | |
| 620 // serialise the client hello as it currently is (i.e. without the CETV | |
| 621 // block). For this, the client hello is serialized without padding. | |
| 622 const size_t orig_min_size = out->minimum_size(); | |
| 623 out->set_minimum_size(0); | |
| 624 | |
| 625 CryptoHandshakeMessage cetv; | |
| 626 cetv.set_tag(kCETV); | |
| 627 | |
| 628 string hkdf_input; | |
| 629 const QuicData& client_hello_serialized = out->GetSerialized(); | |
| 630 hkdf_input.append(QuicCryptoConfig::kCETVLabel, | |
| 631 strlen(QuicCryptoConfig::kCETVLabel) + 1); | |
| 632 hkdf_input.append(reinterpret_cast<char*>(&connection_id), | |
| 633 sizeof(connection_id)); | |
| 634 hkdf_input.append(client_hello_serialized.data(), | |
| 635 client_hello_serialized.length()); | |
| 636 hkdf_input.append(cached->server_config()); | |
| 637 | |
| 638 string key = channel_id_key->SerializeKey(); | |
| 639 string signature; | |
| 640 if (!channel_id_key->Sign(hkdf_input, &signature)) { | |
| 641 *error_details = "Channel ID signature failed"; | |
| 642 return QUIC_INVALID_CHANNEL_ID_SIGNATURE; | |
| 643 } | |
| 644 | |
| 645 cetv.SetStringPiece(kCIDK, key); | |
| 646 cetv.SetStringPiece(kCIDS, signature); | |
| 647 | |
| 648 CrypterPair crypters; | |
| 649 if (!CryptoUtils::DeriveKeys( | |
| 650 out_params->initial_premaster_secret, out_params->aead, | |
| 651 out_params->client_nonce, out_params->server_nonce, hkdf_input, | |
| 652 Perspective::IS_CLIENT, CryptoUtils::Diversification::Never(), | |
| 653 &crypters, nullptr /* subkey secret */)) { | |
| 654 *error_details = "Symmetric key setup failed"; | |
| 655 return QUIC_CRYPTO_SYMMETRIC_KEY_SETUP_FAILED; | |
| 656 } | |
| 657 | |
| 658 const QuicData& cetv_plaintext = cetv.GetSerialized(); | |
| 659 const size_t encrypted_len = | |
| 660 crypters.encrypter->GetCiphertextSize(cetv_plaintext.length()); | |
| 661 std::unique_ptr<char[]> output(new char[encrypted_len]); | |
| 662 size_t output_size = 0; | |
| 663 if (!crypters.encrypter->EncryptPacket( | |
| 664 kDefaultPathId /* path id */, 0 /* packet number */, | |
| 665 StringPiece() /* associated data */, cetv_plaintext.AsStringPiece(), | |
| 666 output.get(), &output_size, encrypted_len)) { | |
| 667 *error_details = "Packet encryption failed"; | |
| 668 return QUIC_ENCRYPTION_FAILURE; | |
| 669 } | |
| 670 | |
| 671 out->SetStringPiece(kCETV, StringPiece(output.get(), output_size)); | |
| 672 out->MarkDirty(); | |
| 673 | |
| 674 out->set_minimum_size(orig_min_size); | |
| 675 } | |
| 676 | |
| 677 // Derive the symmetric keys and set up the encrypters and decrypters. | |
| 678 // Set the following members of out_params: | |
| 679 // out_params->hkdf_input_suffix | |
| 680 // out_params->initial_crypters | |
| 681 out_params->hkdf_input_suffix.clear(); | |
| 682 out_params->hkdf_input_suffix.append(reinterpret_cast<char*>(&connection_id), | |
| 683 sizeof(connection_id)); | |
| 684 const QuicData& client_hello_serialized = out->GetSerialized(); | |
| 685 out_params->hkdf_input_suffix.append(client_hello_serialized.data(), | |
| 686 client_hello_serialized.length()); | |
| 687 out_params->hkdf_input_suffix.append(cached->server_config()); | |
| 688 if (certs.empty()) { | |
| 689 *error_details = "No certs found to include in KDF"; | |
| 690 return QUIC_CRYPTO_INTERNAL_ERROR; | |
| 691 } | |
| 692 out_params->hkdf_input_suffix.append(certs[0]); | |
| 693 | |
| 694 string hkdf_input; | |
| 695 const size_t label_len = strlen(QuicCryptoConfig::kInitialLabel) + 1; | |
| 696 hkdf_input.reserve(label_len + out_params->hkdf_input_suffix.size()); | |
| 697 hkdf_input.append(QuicCryptoConfig::kInitialLabel, label_len); | |
| 698 hkdf_input.append(out_params->hkdf_input_suffix); | |
| 699 | |
| 700 string* subkey_secret = &out_params->initial_subkey_secret; | |
| 701 | |
| 702 // Only perform key diversification for QUIC versions 33 and later. | |
| 703 // TODO(rch): remove the |actual_version| argument to this method when | |
| 704 // QUIC_VERSION_32 is removed. | |
| 705 CryptoUtils::Diversification diversification = | |
| 706 actual_version > QUIC_VERSION_32 ? CryptoUtils::Diversification::Pending() | |
| 707 : CryptoUtils::Diversification::Never(); | |
| 708 if (!CryptoUtils::DeriveKeys(out_params->initial_premaster_secret, | |
| 709 out_params->aead, out_params->client_nonce, | |
| 710 out_params->server_nonce, hkdf_input, | |
| 711 Perspective::IS_CLIENT, diversification, | |
| 712 &out_params->initial_crypters, subkey_secret)) { | |
| 713 *error_details = "Symmetric key setup failed"; | |
| 714 return QUIC_CRYPTO_SYMMETRIC_KEY_SETUP_FAILED; | |
| 715 } | |
| 716 | |
| 717 return QUIC_NO_ERROR; | |
| 718 } | |
| 719 | |
| 720 QuicErrorCode QuicCryptoClientConfig::CacheNewServerConfig( | |
| 721 const CryptoHandshakeMessage& message, | |
| 722 QuicWallTime now, | |
| 723 QuicVersion version, | |
| 724 StringPiece chlo_hash, | |
| 725 const vector<string>& cached_certs, | |
| 726 CachedState* cached, | |
| 727 string* error_details) { | |
| 728 DCHECK(error_details != nullptr); | |
| 729 | |
| 730 StringPiece scfg; | |
| 731 if (!message.GetStringPiece(kSCFG, &scfg)) { | |
| 732 *error_details = "Missing SCFG"; | |
| 733 return QUIC_CRYPTO_MESSAGE_PARAMETER_NOT_FOUND; | |
| 734 } | |
| 735 | |
| 736 CachedState::ServerConfigState state = | |
| 737 cached->SetServerConfig(scfg, now, error_details); | |
| 738 if (state == CachedState::SERVER_CONFIG_EXPIRED) { | |
| 739 return QUIC_CRYPTO_SERVER_CONFIG_EXPIRED; | |
| 740 } | |
| 741 // TODO(rtenneti): Return more specific error code than returning | |
| 742 // QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER. | |
| 743 if (state != CachedState::SERVER_CONFIG_VALID) { | |
| 744 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 745 } | |
| 746 | |
| 747 StringPiece token; | |
| 748 if (message.GetStringPiece(kSourceAddressTokenTag, &token)) { | |
| 749 cached->set_source_address_token(token); | |
| 750 } | |
| 751 | |
| 752 StringPiece proof, cert_bytes, cert_sct; | |
| 753 bool has_proof = message.GetStringPiece(kPROF, &proof); | |
| 754 bool has_cert = message.GetStringPiece(kCertificateTag, &cert_bytes); | |
| 755 if (has_proof && has_cert) { | |
| 756 vector<string> certs; | |
| 757 if (!CertCompressor::DecompressChain(cert_bytes, cached_certs, | |
| 758 common_cert_sets, &certs)) { | |
| 759 *error_details = "Certificate data invalid"; | |
| 760 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 761 } | |
| 762 | |
| 763 message.GetStringPiece(kCertificateSCTTag, &cert_sct); | |
| 764 cached->SetProof(certs, cert_sct, chlo_hash, proof); | |
| 765 } else { | |
| 766 // Secure QUIC: clear existing proof as we have been sent a new SCFG | |
| 767 // without matching proof/certs. | |
| 768 cached->ClearProof(); | |
| 769 | |
| 770 if (has_proof && !has_cert) { | |
| 771 *error_details = "Certificate missing"; | |
| 772 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 773 } | |
| 774 | |
| 775 if (!has_proof && has_cert) { | |
| 776 *error_details = "Proof missing"; | |
| 777 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 778 } | |
| 779 } | |
| 780 | |
| 781 return QUIC_NO_ERROR; | |
| 782 } | |
| 783 | |
| 784 QuicErrorCode QuicCryptoClientConfig::ProcessRejection( | |
| 785 const CryptoHandshakeMessage& rej, | |
| 786 QuicWallTime now, | |
| 787 const QuicVersion version, | |
| 788 StringPiece chlo_hash, | |
| 789 CachedState* cached, | |
| 790 QuicCryptoNegotiatedParameters* out_params, | |
| 791 string* error_details) { | |
| 792 DCHECK(error_details != nullptr); | |
| 793 | |
| 794 if ((rej.tag() != kREJ) && (rej.tag() != kSREJ)) { | |
| 795 *error_details = "Message is not REJ or SREJ"; | |
| 796 return QUIC_CRYPTO_INTERNAL_ERROR; | |
| 797 } | |
| 798 | |
| 799 QuicErrorCode error = | |
| 800 CacheNewServerConfig(rej, now, version, chlo_hash, | |
| 801 out_params->cached_certs, cached, error_details); | |
| 802 if (error != QUIC_NO_ERROR) { | |
| 803 return error; | |
| 804 } | |
| 805 | |
| 806 StringPiece nonce; | |
| 807 if (rej.GetStringPiece(kServerNonceTag, &nonce)) { | |
| 808 out_params->server_nonce = nonce.as_string(); | |
| 809 } | |
| 810 | |
| 811 if (rej.tag() == kSREJ) { | |
| 812 QuicConnectionId connection_id; | |
| 813 if (rej.GetUint64(kRCID, &connection_id) != QUIC_NO_ERROR) { | |
| 814 *error_details = "Missing kRCID"; | |
| 815 return QUIC_CRYPTO_MESSAGE_PARAMETER_NOT_FOUND; | |
| 816 } | |
| 817 cached->add_server_designated_connection_id(connection_id); | |
| 818 if (!nonce.empty()) { | |
| 819 cached->add_server_nonce(nonce.as_string()); | |
| 820 } | |
| 821 return QUIC_NO_ERROR; | |
| 822 } | |
| 823 | |
| 824 return QUIC_NO_ERROR; | |
| 825 } | |
| 826 | |
| 827 QuicErrorCode QuicCryptoClientConfig::ProcessServerHello( | |
| 828 const CryptoHandshakeMessage& server_hello, | |
| 829 QuicConnectionId connection_id, | |
| 830 QuicVersion version, | |
| 831 const QuicVersionVector& negotiated_versions, | |
| 832 CachedState* cached, | |
| 833 QuicCryptoNegotiatedParameters* out_params, | |
| 834 string* error_details) { | |
| 835 DCHECK(error_details != nullptr); | |
| 836 | |
| 837 QuicErrorCode valid = CryptoUtils::ValidateServerHello( | |
| 838 server_hello, negotiated_versions, error_details); | |
| 839 if (valid != QUIC_NO_ERROR) { | |
| 840 return valid; | |
| 841 } | |
| 842 | |
| 843 // Learn about updated source address tokens. | |
| 844 StringPiece token; | |
| 845 if (server_hello.GetStringPiece(kSourceAddressTokenTag, &token)) { | |
| 846 cached->set_source_address_token(token); | |
| 847 } | |
| 848 | |
| 849 StringPiece shlo_nonce; | |
| 850 if (!server_hello.GetStringPiece(kServerNonceTag, &shlo_nonce)) { | |
| 851 *error_details = "server hello missing server nonce"; | |
| 852 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 853 } | |
| 854 | |
| 855 // TODO(agl): | |
| 856 // learn about updated SCFGs. | |
| 857 | |
| 858 StringPiece public_value; | |
| 859 if (!server_hello.GetStringPiece(kPUBS, &public_value)) { | |
| 860 *error_details = "server hello missing forward secure public value"; | |
| 861 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 862 } | |
| 863 | |
| 864 if (!out_params->client_key_exchange->CalculateSharedKey( | |
| 865 public_value, &out_params->forward_secure_premaster_secret)) { | |
| 866 *error_details = "Key exchange failure"; | |
| 867 return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER; | |
| 868 } | |
| 869 | |
| 870 string hkdf_input; | |
| 871 const size_t label_len = strlen(QuicCryptoConfig::kForwardSecureLabel) + 1; | |
| 872 hkdf_input.reserve(label_len + out_params->hkdf_input_suffix.size()); | |
| 873 hkdf_input.append(QuicCryptoConfig::kForwardSecureLabel, label_len); | |
| 874 hkdf_input.append(out_params->hkdf_input_suffix); | |
| 875 | |
| 876 if (!CryptoUtils::DeriveKeys( | |
| 877 out_params->forward_secure_premaster_secret, out_params->aead, | |
| 878 out_params->client_nonce, | |
| 879 shlo_nonce.empty() ? out_params->server_nonce : shlo_nonce, | |
| 880 hkdf_input, Perspective::IS_CLIENT, | |
| 881 CryptoUtils::Diversification::Never(), | |
| 882 &out_params->forward_secure_crypters, &out_params->subkey_secret)) { | |
| 883 *error_details = "Symmetric key setup failed"; | |
| 884 return QUIC_CRYPTO_SYMMETRIC_KEY_SETUP_FAILED; | |
| 885 } | |
| 886 | |
| 887 return QUIC_NO_ERROR; | |
| 888 } | |
| 889 | |
| 890 QuicErrorCode QuicCryptoClientConfig::ProcessServerConfigUpdate( | |
| 891 const CryptoHandshakeMessage& server_config_update, | |
| 892 QuicWallTime now, | |
| 893 const QuicVersion version, | |
| 894 StringPiece chlo_hash, | |
| 895 CachedState* cached, | |
| 896 QuicCryptoNegotiatedParameters* out_params, | |
| 897 string* error_details) { | |
| 898 DCHECK(error_details != nullptr); | |
| 899 | |
| 900 if (server_config_update.tag() != kSCUP) { | |
| 901 *error_details = "ServerConfigUpdate must have kSCUP tag."; | |
| 902 return QUIC_INVALID_CRYPTO_MESSAGE_TYPE; | |
| 903 } | |
| 904 return CacheNewServerConfig(server_config_update, now, version, chlo_hash, | |
| 905 out_params->cached_certs, cached, error_details); | |
| 906 } | |
| 907 | |
| 908 ProofVerifier* QuicCryptoClientConfig::proof_verifier() const { | |
| 909 return proof_verifier_.get(); | |
| 910 } | |
| 911 | |
| 912 ChannelIDSource* QuicCryptoClientConfig::channel_id_source() const { | |
| 913 return channel_id_source_.get(); | |
| 914 } | |
| 915 | |
| 916 void QuicCryptoClientConfig::SetChannelIDSource(ChannelIDSource* source) { | |
| 917 channel_id_source_.reset(source); | |
| 918 } | |
| 919 | |
| 920 void QuicCryptoClientConfig::InitializeFrom( | |
| 921 const QuicServerId& server_id, | |
| 922 const QuicServerId& canonical_server_id, | |
| 923 QuicCryptoClientConfig* canonical_crypto_config) { | |
| 924 CachedState* canonical_cached = | |
| 925 canonical_crypto_config->LookupOrCreate(canonical_server_id); | |
| 926 if (!canonical_cached->proof_valid()) { | |
| 927 return; | |
| 928 } | |
| 929 CachedState* cached = LookupOrCreate(server_id); | |
| 930 cached->InitializeFrom(*canonical_cached); | |
| 931 } | |
| 932 | |
| 933 void QuicCryptoClientConfig::AddCanonicalSuffix(const string& suffix) { | |
| 934 canonical_suffixes_.push_back(suffix); | |
| 935 } | |
| 936 | |
| 937 void QuicCryptoClientConfig::PreferAesGcm() { | |
| 938 DCHECK(!aead.empty()); | |
| 939 if (aead.size() <= 1) { | |
| 940 return; | |
| 941 } | |
| 942 QuicTagVector::iterator pos = std::find(aead.begin(), aead.end(), kAESG); | |
| 943 if (pos != aead.end()) { | |
| 944 aead.erase(pos); | |
| 945 aead.insert(aead.begin(), kAESG); | |
| 946 } | |
| 947 } | |
| 948 | |
| 949 void QuicCryptoClientConfig::DisableEcdsa() { | |
| 950 disable_ecdsa_ = true; | |
| 951 } | |
| 952 | |
| 953 bool QuicCryptoClientConfig::PopulateFromCanonicalConfig( | |
| 954 const QuicServerId& server_id, | |
| 955 CachedState* server_state) { | |
| 956 DCHECK(server_state->IsEmpty()); | |
| 957 size_t i = 0; | |
| 958 for (; i < canonical_suffixes_.size(); ++i) { | |
| 959 if (base::EndsWith(server_id.host(), canonical_suffixes_[i], | |
| 960 base::CompareCase::INSENSITIVE_ASCII)) { | |
| 961 break; | |
| 962 } | |
| 963 } | |
| 964 if (i == canonical_suffixes_.size()) { | |
| 965 return false; | |
| 966 } | |
| 967 | |
| 968 QuicServerId suffix_server_id(canonical_suffixes_[i], server_id.port(), | |
| 969 server_id.privacy_mode()); | |
| 970 if (!ContainsKey(canonical_server_map_, suffix_server_id)) { | |
| 971 // This is the first host we've seen which matches the suffix, so make it | |
| 972 // canonical. | |
| 973 canonical_server_map_[suffix_server_id] = server_id; | |
| 974 return false; | |
| 975 } | |
| 976 | |
| 977 const QuicServerId& canonical_server_id = | |
| 978 canonical_server_map_[suffix_server_id]; | |
| 979 CachedState* canonical_state = cached_states_[canonical_server_id]; | |
| 980 if (!canonical_state->proof_valid()) { | |
| 981 return false; | |
| 982 } | |
| 983 | |
| 984 // Update canonical version to point at the "most recent" entry. | |
| 985 canonical_server_map_[suffix_server_id] = server_id; | |
| 986 | |
| 987 server_state->InitializeFrom(*canonical_state); | |
| 988 return true; | |
| 989 } | |
| 990 | |
| 991 } // 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