| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "quic/core/quic_crypto_server_stream.h" |
| |
| #include <memory> |
| #include <string> |
| |
| #include "absl/base/macros.h" |
| #include "absl/strings/string_view.h" |
| #include "third_party/boringssl/src/include/openssl/sha.h" |
| #include "quic/platform/api/quic_flag_utils.h" |
| #include "quic/platform/api/quic_testvalue.h" |
| #include "common/quiche_text_utils.h" |
| |
| namespace quic { |
| |
| class QuicCryptoServerStream::ProcessClientHelloCallback |
| : public ProcessClientHelloResultCallback { |
| public: |
| ProcessClientHelloCallback( |
| QuicCryptoServerStream* parent, |
| const QuicReferenceCountedPointer< |
| ValidateClientHelloResultCallback::Result>& result) |
| : parent_(parent), result_(result) {} |
| |
| void Run( |
| QuicErrorCode error, |
| const std::string& error_details, |
| std::unique_ptr<CryptoHandshakeMessage> message, |
| std::unique_ptr<DiversificationNonce> diversification_nonce, |
| std::unique_ptr<ProofSource::Details> proof_source_details) override { |
| if (parent_ == nullptr) { |
| return; |
| } |
| |
| parent_->FinishProcessingHandshakeMessageAfterProcessClientHello( |
| *result_, error, error_details, std::move(message), |
| std::move(diversification_nonce), std::move(proof_source_details)); |
| } |
| |
| void Cancel() { parent_ = nullptr; } |
| |
| private: |
| QuicCryptoServerStream* parent_; |
| QuicReferenceCountedPointer<ValidateClientHelloResultCallback::Result> |
| result_; |
| }; |
| |
| QuicCryptoServerStream::QuicCryptoServerStream( |
| const QuicCryptoServerConfig* crypto_config, |
| QuicCompressedCertsCache* compressed_certs_cache, |
| QuicSession* session, |
| QuicCryptoServerStreamBase::Helper* helper) |
| : QuicCryptoServerStreamBase(session), |
| QuicCryptoHandshaker(this, session), |
| session_(session), |
| delegate_(session), |
| crypto_config_(crypto_config), |
| compressed_certs_cache_(compressed_certs_cache), |
| signed_config_(new QuicSignedServerConfig), |
| helper_(helper), |
| num_handshake_messages_(0), |
| num_handshake_messages_with_server_nonces_(0), |
| send_server_config_update_cb_(nullptr), |
| num_server_config_update_messages_sent_(0), |
| zero_rtt_attempted_(false), |
| chlo_packet_size_(0), |
| validate_client_hello_cb_(nullptr), |
| process_client_hello_cb_(nullptr), |
| encryption_established_(false), |
| one_rtt_keys_available_(false), |
| one_rtt_packet_decrypted_(false), |
| crypto_negotiated_params_(new QuicCryptoNegotiatedParameters) {} |
| |
| QuicCryptoServerStream::~QuicCryptoServerStream() { |
| CancelOutstandingCallbacks(); |
| } |
| |
| void QuicCryptoServerStream::CancelOutstandingCallbacks() { |
| // Detach from the validation callback. Calling this multiple times is safe. |
| if (validate_client_hello_cb_ != nullptr) { |
| validate_client_hello_cb_->Cancel(); |
| validate_client_hello_cb_ = nullptr; |
| } |
| if (send_server_config_update_cb_ != nullptr) { |
| send_server_config_update_cb_->Cancel(); |
| send_server_config_update_cb_ = nullptr; |
| } |
| if (process_client_hello_cb_ != nullptr) { |
| process_client_hello_cb_->Cancel(); |
| process_client_hello_cb_ = nullptr; |
| } |
| } |
| |
| void QuicCryptoServerStream::OnHandshakeMessage( |
| const CryptoHandshakeMessage& message) { |
| QuicCryptoHandshaker::OnHandshakeMessage(message); |
| ++num_handshake_messages_; |
| chlo_packet_size_ = session()->connection()->GetCurrentPacket().length(); |
| |
| // Do not process handshake messages after the handshake is confirmed. |
| if (one_rtt_keys_available_) { |
| OnUnrecoverableError(QUIC_CRYPTO_MESSAGE_AFTER_HANDSHAKE_COMPLETE, |
| "Unexpected handshake message from client"); |
| return; |
| } |
| |
| if (message.tag() != kCHLO) { |
| OnUnrecoverableError(QUIC_INVALID_CRYPTO_MESSAGE_TYPE, |
| "Handshake packet not CHLO"); |
| return; |
| } |
| |
| if (validate_client_hello_cb_ != nullptr || |
| process_client_hello_cb_ != nullptr) { |
| // Already processing some other handshake message. The protocol |
| // does not allow for clients to send multiple handshake messages |
| // before the server has a chance to respond. |
| OnUnrecoverableError(QUIC_CRYPTO_MESSAGE_WHILE_VALIDATING_CLIENT_HELLO, |
| "Unexpected handshake message while processing CHLO"); |
| return; |
| } |
| |
| chlo_hash_ = |
| CryptoUtils::HashHandshakeMessage(message, Perspective::IS_SERVER); |
| |
| std::unique_ptr<ValidateCallback> cb(new ValidateCallback(this)); |
| QUICHE_DCHECK(validate_client_hello_cb_ == nullptr); |
| QUICHE_DCHECK(process_client_hello_cb_ == nullptr); |
| validate_client_hello_cb_ = cb.get(); |
| crypto_config_->ValidateClientHello( |
| message, GetClientAddress(), session()->connection()->self_address(), |
| transport_version(), session()->connection()->clock(), signed_config_, |
| std::move(cb)); |
| } |
| |
| void QuicCryptoServerStream::FinishProcessingHandshakeMessage( |
| QuicReferenceCountedPointer<ValidateClientHelloResultCallback::Result> |
| result, |
| std::unique_ptr<ProofSource::Details> details) { |
| // Clear the callback that got us here. |
| QUICHE_DCHECK(validate_client_hello_cb_ != nullptr); |
| QUICHE_DCHECK(process_client_hello_cb_ == nullptr); |
| validate_client_hello_cb_ = nullptr; |
| |
| std::unique_ptr<ProcessClientHelloCallback> cb( |
| new ProcessClientHelloCallback(this, result)); |
| process_client_hello_cb_ = cb.get(); |
| ProcessClientHello(result, std::move(details), std::move(cb)); |
| } |
| |
| void QuicCryptoServerStream:: |
| FinishProcessingHandshakeMessageAfterProcessClientHello( |
| const ValidateClientHelloResultCallback::Result& result, |
| QuicErrorCode error, |
| const std::string& error_details, |
| std::unique_ptr<CryptoHandshakeMessage> reply, |
| std::unique_ptr<DiversificationNonce> diversification_nonce, |
| std::unique_ptr<ProofSource::Details> proof_source_details) { |
| // Clear the callback that got us here. |
| QUICHE_DCHECK(process_client_hello_cb_ != nullptr); |
| QUICHE_DCHECK(validate_client_hello_cb_ == nullptr); |
| process_client_hello_cb_ = nullptr; |
| proof_source_details_ = std::move(proof_source_details); |
| |
| AdjustTestValue("quic::QuicCryptoServerStream::after_process_client_hello", |
| session()); |
| |
| if (noop_if_disconnected_after_process_chlo_) { |
| QUIC_RELOADABLE_FLAG_COUNT( |
| quic_crypto_noop_if_disconnected_after_process_chlo); |
| if (!session()->connection()->connected()) { |
| QUIC_CODE_COUNT(quic_crypto_disconnected_after_process_client_hello); |
| QUIC_LOG_FIRST_N(INFO, 10) |
| << "After processing CHLO, QUIC connection has been closed with code " |
| << session()->error() << ", details: " << session()->error_details(); |
| return; |
| } |
| } |
| |
| const CryptoHandshakeMessage& message = result.client_hello; |
| if (error != QUIC_NO_ERROR) { |
| OnUnrecoverableError(error, error_details); |
| return; |
| } |
| |
| if (reply->tag() != kSHLO) { |
| session()->connection()->set_fully_pad_crypto_handshake_packets( |
| crypto_config_->pad_rej()); |
| // Send REJ in plaintext. |
| SendHandshakeMessage(*reply, ENCRYPTION_INITIAL); |
| return; |
| } |
| |
| // If we are returning a SHLO then we accepted the handshake. Now |
| // process the negotiated configuration options as part of the |
| // session config. |
| QuicConfig* config = session()->config(); |
| OverrideQuicConfigDefaults(config); |
| std::string process_error_details; |
| const QuicErrorCode process_error = |
| config->ProcessPeerHello(message, CLIENT, &process_error_details); |
| if (process_error != QUIC_NO_ERROR) { |
| OnUnrecoverableError(process_error, process_error_details); |
| return; |
| } |
| |
| session()->OnConfigNegotiated(); |
| |
| config->ToHandshakeMessage(reply.get(), session()->transport_version()); |
| |
| // Receiving a full CHLO implies the client is prepared to decrypt with |
| // the new server write key. We can start to encrypt with the new server |
| // write key. |
| // |
| // NOTE: the SHLO will be encrypted with the new server write key. |
| delegate_->OnNewEncryptionKeyAvailable( |
| ENCRYPTION_ZERO_RTT, |
| std::move(crypto_negotiated_params_->initial_crypters.encrypter)); |
| delegate_->OnNewDecryptionKeyAvailable( |
| ENCRYPTION_ZERO_RTT, |
| std::move(crypto_negotiated_params_->initial_crypters.decrypter), |
| /*set_alternative_decrypter=*/false, |
| /*latch_once_used=*/false); |
| delegate_->SetDefaultEncryptionLevel(ENCRYPTION_ZERO_RTT); |
| delegate_->DiscardOldDecryptionKey(ENCRYPTION_INITIAL); |
| session()->connection()->SetDiversificationNonce(*diversification_nonce); |
| |
| session()->connection()->set_fully_pad_crypto_handshake_packets( |
| crypto_config_->pad_shlo()); |
| // Send SHLO in ENCRYPTION_ZERO_RTT. |
| SendHandshakeMessage(*reply, ENCRYPTION_ZERO_RTT); |
| delegate_->OnNewEncryptionKeyAvailable( |
| ENCRYPTION_FORWARD_SECURE, |
| std::move(crypto_negotiated_params_->forward_secure_crypters.encrypter)); |
| delegate_->OnNewDecryptionKeyAvailable( |
| ENCRYPTION_FORWARD_SECURE, |
| std::move(crypto_negotiated_params_->forward_secure_crypters.decrypter), |
| /*set_alternative_decrypter=*/true, |
| /*latch_once_used=*/false); |
| encryption_established_ = true; |
| one_rtt_keys_available_ = true; |
| delegate_->SetDefaultEncryptionLevel(ENCRYPTION_FORWARD_SECURE); |
| delegate_->DiscardOldEncryptionKey(ENCRYPTION_INITIAL); |
| } |
| |
| void QuicCryptoServerStream::SendServerConfigUpdate( |
| const CachedNetworkParameters* cached_network_params) { |
| if (!one_rtt_keys_available_) { |
| return; |
| } |
| |
| if (send_server_config_update_cb_ != nullptr) { |
| QUIC_DVLOG(1) |
| << "Skipped server config update since one is already in progress"; |
| return; |
| } |
| |
| std::unique_ptr<SendServerConfigUpdateCallback> cb( |
| new SendServerConfigUpdateCallback(this)); |
| send_server_config_update_cb_ = cb.get(); |
| |
| crypto_config_->BuildServerConfigUpdateMessage( |
| session()->transport_version(), chlo_hash_, |
| previous_source_address_tokens_, session()->connection()->self_address(), |
| GetClientAddress(), session()->connection()->clock(), |
| session()->connection()->random_generator(), compressed_certs_cache_, |
| *crypto_negotiated_params_, cached_network_params, std::move(cb)); |
| } |
| |
| QuicCryptoServerStream::SendServerConfigUpdateCallback:: |
| SendServerConfigUpdateCallback(QuicCryptoServerStream* parent) |
| : parent_(parent) {} |
| |
| void QuicCryptoServerStream::SendServerConfigUpdateCallback::Cancel() { |
| parent_ = nullptr; |
| } |
| |
| // From BuildServerConfigUpdateMessageResultCallback |
| void QuicCryptoServerStream::SendServerConfigUpdateCallback::Run( |
| bool ok, |
| const CryptoHandshakeMessage& message) { |
| if (parent_ == nullptr) { |
| return; |
| } |
| parent_->FinishSendServerConfigUpdate(ok, message); |
| } |
| |
| void QuicCryptoServerStream::FinishSendServerConfigUpdate( |
| bool ok, |
| const CryptoHandshakeMessage& message) { |
| // Clear the callback that got us here. |
| QUICHE_DCHECK(send_server_config_update_cb_ != nullptr); |
| send_server_config_update_cb_ = nullptr; |
| |
| if (!ok) { |
| QUIC_DVLOG(1) << "Server: Failed to build server config update (SCUP)!"; |
| return; |
| } |
| |
| QUIC_DVLOG(1) << "Server: Sending server config update: " |
| << message.DebugString(); |
| |
| // Send server config update in ENCRYPTION_FORWARD_SECURE. |
| SendHandshakeMessage(message, ENCRYPTION_FORWARD_SECURE); |
| |
| ++num_server_config_update_messages_sent_; |
| } |
| |
| bool QuicCryptoServerStream::IsZeroRtt() const { |
| return num_handshake_messages_ == 1 && |
| num_handshake_messages_with_server_nonces_ == 0; |
| } |
| |
| bool QuicCryptoServerStream::IsResumption() const { |
| // QUIC Crypto doesn't have a non-0-RTT resumption mode. |
| return IsZeroRtt(); |
| } |
| |
| int QuicCryptoServerStream::NumServerConfigUpdateMessagesSent() const { |
| return num_server_config_update_messages_sent_; |
| } |
| |
| const CachedNetworkParameters* |
| QuicCryptoServerStream::PreviousCachedNetworkParams() const { |
| return previous_cached_network_params_.get(); |
| } |
| |
| bool QuicCryptoServerStream::ResumptionAttempted() const { |
| return zero_rtt_attempted_; |
| } |
| |
| void QuicCryptoServerStream::SetPreviousCachedNetworkParams( |
| CachedNetworkParameters cached_network_params) { |
| previous_cached_network_params_.reset( |
| new CachedNetworkParameters(cached_network_params)); |
| } |
| |
| void QuicCryptoServerStream::OnPacketDecrypted(EncryptionLevel level) { |
| if (level == ENCRYPTION_FORWARD_SECURE) { |
| one_rtt_packet_decrypted_ = true; |
| delegate_->NeuterHandshakeData(); |
| } |
| } |
| |
| void QuicCryptoServerStream::OnHandshakeDoneReceived() { |
| QUICHE_DCHECK(false); |
| } |
| |
| void QuicCryptoServerStream::OnNewTokenReceived(absl::string_view /*token*/) { |
| QUICHE_DCHECK(false); |
| } |
| |
| std::string QuicCryptoServerStream::GetAddressToken( |
| const CachedNetworkParameters* /*cached_network_parameters*/) const { |
| QUICHE_DCHECK(false); |
| return ""; |
| } |
| |
| bool QuicCryptoServerStream::ValidateAddressToken( |
| absl::string_view /*token*/) const { |
| QUICHE_DCHECK(false); |
| return false; |
| } |
| |
| bool QuicCryptoServerStream::ShouldSendExpectCTHeader() const { |
| return signed_config_->proof.send_expect_ct_header; |
| } |
| |
| bool QuicCryptoServerStream::DidCertMatchSni() const { |
| return signed_config_->proof.cert_matched_sni; |
| } |
| |
| const ProofSource::Details* QuicCryptoServerStream::ProofSourceDetails() const { |
| return proof_source_details_.get(); |
| } |
| |
| bool QuicCryptoServerStream::GetBase64SHA256ClientChannelID( |
| std::string* output) const { |
| if (!encryption_established() || |
| crypto_negotiated_params_->channel_id.empty()) { |
| return false; |
| } |
| |
| const std::string& channel_id(crypto_negotiated_params_->channel_id); |
| uint8_t digest[SHA256_DIGEST_LENGTH]; |
| SHA256(reinterpret_cast<const uint8_t*>(channel_id.data()), channel_id.size(), |
| digest); |
| |
| quiche::QuicheTextUtils::Base64Encode(digest, ABSL_ARRAYSIZE(digest), output); |
| return true; |
| } |
| |
| ssl_early_data_reason_t QuicCryptoServerStream::EarlyDataReason() const { |
| if (IsZeroRtt()) { |
| return ssl_early_data_accepted; |
| } |
| if (zero_rtt_attempted_) { |
| return ssl_early_data_session_not_resumed; |
| } |
| return ssl_early_data_no_session_offered; |
| } |
| |
| bool QuicCryptoServerStream::encryption_established() const { |
| return encryption_established_; |
| } |
| |
| bool QuicCryptoServerStream::one_rtt_keys_available() const { |
| return one_rtt_keys_available_; |
| } |
| |
| const QuicCryptoNegotiatedParameters& |
| QuicCryptoServerStream::crypto_negotiated_params() const { |
| return *crypto_negotiated_params_; |
| } |
| |
| CryptoMessageParser* QuicCryptoServerStream::crypto_message_parser() { |
| return QuicCryptoHandshaker::crypto_message_parser(); |
| } |
| |
| HandshakeState QuicCryptoServerStream::GetHandshakeState() const { |
| return one_rtt_packet_decrypted_ ? HANDSHAKE_COMPLETE : HANDSHAKE_START; |
| } |
| |
| void QuicCryptoServerStream::SetServerApplicationStateForResumption( |
| std::unique_ptr<ApplicationState> /*state*/) { |
| // QUIC Crypto doesn't need to remember any application state as part of doing |
| // 0-RTT resumption, so this function is a no-op. |
| } |
| |
| size_t QuicCryptoServerStream::BufferSizeLimitForLevel( |
| EncryptionLevel level) const { |
| return QuicCryptoHandshaker::BufferSizeLimitForLevel(level); |
| } |
| |
| std::unique_ptr<QuicDecrypter> |
| QuicCryptoServerStream::AdvanceKeysAndCreateCurrentOneRttDecrypter() { |
| // Key update is only defined in QUIC+TLS. |
| QUICHE_DCHECK(false); |
| return nullptr; |
| } |
| |
| std::unique_ptr<QuicEncrypter> |
| QuicCryptoServerStream::CreateCurrentOneRttEncrypter() { |
| // Key update is only defined in QUIC+TLS. |
| QUICHE_DCHECK(false); |
| return nullptr; |
| } |
| |
| void QuicCryptoServerStream::ProcessClientHello( |
| QuicReferenceCountedPointer<ValidateClientHelloResultCallback::Result> |
| result, |
| std::unique_ptr<ProofSource::Details> proof_source_details, |
| std::unique_ptr<ProcessClientHelloResultCallback> done_cb) { |
| proof_source_details_ = std::move(proof_source_details); |
| const CryptoHandshakeMessage& message = result->client_hello; |
| std::string error_details; |
| if (!helper_->CanAcceptClientHello( |
| message, GetClientAddress(), session()->connection()->peer_address(), |
| session()->connection()->self_address(), &error_details)) { |
| done_cb->Run(QUIC_HANDSHAKE_FAILED, error_details, nullptr, nullptr, |
| nullptr); |
| return; |
| } |
| |
| absl::string_view user_agent_id; |
| message.GetStringPiece(quic::kUAID, &user_agent_id); |
| if (!session()->user_agent_id().has_value() && !user_agent_id.empty()) { |
| session()->SetUserAgentId(std::string(user_agent_id)); |
| } |
| |
| if (!result->info.server_nonce.empty()) { |
| ++num_handshake_messages_with_server_nonces_; |
| } |
| |
| if (num_handshake_messages_ == 1) { |
| // Client attempts zero RTT handshake by sending a non-inchoate CHLO. |
| absl::string_view public_value; |
| zero_rtt_attempted_ = message.GetStringPiece(kPUBS, &public_value); |
| } |
| |
| // Store the bandwidth estimate from the client. |
| if (result->cached_network_params.bandwidth_estimate_bytes_per_second() > 0) { |
| previous_cached_network_params_.reset( |
| new CachedNetworkParameters(result->cached_network_params)); |
| } |
| previous_source_address_tokens_ = result->info.source_address_tokens; |
| |
| QuicConnection* connection = session()->connection(); |
| crypto_config_->ProcessClientHello( |
| result, /*reject_only=*/false, connection->connection_id(), |
| connection->self_address(), GetClientAddress(), connection->version(), |
| session()->supported_versions(), connection->clock(), |
| connection->random_generator(), compressed_certs_cache_, |
| crypto_negotiated_params_, signed_config_, |
| QuicCryptoStream::CryptoMessageFramingOverhead( |
| transport_version(), connection->connection_id()), |
| chlo_packet_size_, std::move(done_cb)); |
| } |
| |
| void QuicCryptoServerStream::OverrideQuicConfigDefaults( |
| QuicConfig* /*config*/) {} |
| |
| QuicCryptoServerStream::ValidateCallback::ValidateCallback( |
| QuicCryptoServerStream* parent) |
| : parent_(parent) {} |
| |
| void QuicCryptoServerStream::ValidateCallback::Cancel() { |
| parent_ = nullptr; |
| } |
| |
| void QuicCryptoServerStream::ValidateCallback::Run( |
| QuicReferenceCountedPointer<Result> result, |
| std::unique_ptr<ProofSource::Details> details) { |
| if (parent_ != nullptr) { |
| parent_->FinishProcessingHandshakeMessage(std::move(result), |
| std::move(details)); |
| } |
| } |
| |
| const QuicSocketAddress QuicCryptoServerStream::GetClientAddress() { |
| return session()->connection()->peer_address(); |
| } |
| |
| SSL* QuicCryptoServerStream::GetSsl() const { return nullptr; } |
| |
| } // namespace quic |