| // 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 "net/third_party/quiche/src/quic/core/quic_crypto_client_handshaker.h" |
| |
| #include <memory> |
| |
| #include "net/third_party/quiche/src/quic/core/crypto/crypto_protocol.h" |
| #include "net/third_party/quiche/src/quic/core/crypto/crypto_utils.h" |
| #include "net/third_party/quiche/src/quic/core/quic_session.h" |
| #include "net/third_party/quiche/src/quic/platform/api/quic_client_stats.h" |
| #include "net/third_party/quiche/src/quic/platform/api/quic_flags.h" |
| #include "net/third_party/quiche/src/quic/platform/api/quic_logging.h" |
| #include "net/third_party/quiche/src/quic/platform/api/quic_str_cat.h" |
| #include "net/third_party/quiche/src/quic/platform/api/quic_string.h" |
| |
| namespace quic { |
| |
| QuicCryptoClientHandshaker::ChannelIDSourceCallbackImpl:: |
| ChannelIDSourceCallbackImpl(QuicCryptoClientHandshaker* parent) |
| : parent_(parent) {} |
| |
| QuicCryptoClientHandshaker::ChannelIDSourceCallbackImpl:: |
| ~ChannelIDSourceCallbackImpl() {} |
| |
| void QuicCryptoClientHandshaker::ChannelIDSourceCallbackImpl::Run( |
| std::unique_ptr<ChannelIDKey>* channel_id_key) { |
| if (parent_ == nullptr) { |
| return; |
| } |
| |
| parent_->channel_id_key_ = std::move(*channel_id_key); |
| parent_->channel_id_source_callback_run_ = true; |
| parent_->channel_id_source_callback_ = nullptr; |
| parent_->DoHandshakeLoop(nullptr); |
| |
| // The ChannelIDSource owns this object and will delete it when this method |
| // returns. |
| } |
| |
| void QuicCryptoClientHandshaker::ChannelIDSourceCallbackImpl::Cancel() { |
| parent_ = nullptr; |
| } |
| |
| QuicCryptoClientHandshaker::ProofVerifierCallbackImpl:: |
| ProofVerifierCallbackImpl(QuicCryptoClientHandshaker* parent) |
| : parent_(parent) {} |
| |
| QuicCryptoClientHandshaker::ProofVerifierCallbackImpl:: |
| ~ProofVerifierCallbackImpl() {} |
| |
| void QuicCryptoClientHandshaker::ProofVerifierCallbackImpl::Run( |
| bool ok, |
| const QuicString& error_details, |
| std::unique_ptr<ProofVerifyDetails>* details) { |
| if (parent_ == nullptr) { |
| return; |
| } |
| |
| parent_->verify_ok_ = ok; |
| parent_->verify_error_details_ = error_details; |
| parent_->verify_details_ = std::move(*details); |
| parent_->proof_verify_callback_ = nullptr; |
| parent_->DoHandshakeLoop(nullptr); |
| |
| // The ProofVerifier owns this object and will delete it when this method |
| // returns. |
| } |
| |
| void QuicCryptoClientHandshaker::ProofVerifierCallbackImpl::Cancel() { |
| parent_ = nullptr; |
| } |
| |
| QuicCryptoClientHandshaker::QuicCryptoClientHandshaker( |
| const QuicServerId& server_id, |
| QuicCryptoClientStream* stream, |
| QuicSession* session, |
| std::unique_ptr<ProofVerifyContext> verify_context, |
| QuicCryptoClientConfig* crypto_config, |
| QuicCryptoClientStream::ProofHandler* proof_handler) |
| : QuicCryptoHandshaker(stream, session), |
| stream_(stream), |
| session_(session), |
| next_state_(STATE_IDLE), |
| num_client_hellos_(0), |
| crypto_config_(crypto_config), |
| server_id_(server_id), |
| generation_counter_(0), |
| channel_id_sent_(false), |
| channel_id_source_callback_run_(false), |
| channel_id_source_callback_(nullptr), |
| verify_context_(std::move(verify_context)), |
| proof_verify_callback_(nullptr), |
| proof_handler_(proof_handler), |
| verify_ok_(false), |
| stateless_reject_received_(false), |
| proof_verify_start_time_(QuicWallTime::Zero()), |
| num_scup_messages_received_(0), |
| encryption_established_(false), |
| handshake_confirmed_(false), |
| crypto_negotiated_params_(new QuicCryptoNegotiatedParameters) {} |
| |
| QuicCryptoClientHandshaker::~QuicCryptoClientHandshaker() { |
| if (channel_id_source_callback_) { |
| channel_id_source_callback_->Cancel(); |
| } |
| if (proof_verify_callback_) { |
| proof_verify_callback_->Cancel(); |
| } |
| } |
| |
| void QuicCryptoClientHandshaker::OnHandshakeMessage( |
| const CryptoHandshakeMessage& message) { |
| QuicCryptoHandshaker::OnHandshakeMessage(message); |
| if (message.tag() == kSCUP) { |
| if (!handshake_confirmed()) { |
| stream_->CloseConnectionWithDetails( |
| QUIC_CRYPTO_UPDATE_BEFORE_HANDSHAKE_COMPLETE, |
| "Early SCUP disallowed"); |
| return; |
| } |
| |
| // |message| is an update from the server, so we treat it differently from a |
| // handshake message. |
| HandleServerConfigUpdateMessage(message); |
| num_scup_messages_received_++; |
| return; |
| } |
| |
| // Do not process handshake messages after the handshake is confirmed. |
| if (handshake_confirmed()) { |
| stream_->CloseConnectionWithDetails( |
| QUIC_CRYPTO_MESSAGE_AFTER_HANDSHAKE_COMPLETE, |
| "Unexpected handshake message"); |
| return; |
| } |
| |
| DoHandshakeLoop(&message); |
| } |
| |
| bool QuicCryptoClientHandshaker::CryptoConnect() { |
| next_state_ = STATE_INITIALIZE; |
| DoHandshakeLoop(nullptr); |
| return session()->connection()->connected(); |
| } |
| |
| int QuicCryptoClientHandshaker::num_sent_client_hellos() const { |
| return num_client_hellos_; |
| } |
| |
| int QuicCryptoClientHandshaker::num_scup_messages_received() const { |
| return num_scup_messages_received_; |
| } |
| |
| bool QuicCryptoClientHandshaker::WasChannelIDSent() const { |
| return channel_id_sent_; |
| } |
| |
| bool QuicCryptoClientHandshaker::WasChannelIDSourceCallbackRun() const { |
| return channel_id_source_callback_run_; |
| } |
| |
| QuicLongHeaderType QuicCryptoClientHandshaker::GetLongHeaderType( |
| QuicStreamOffset offset) const { |
| return offset == 0 ? INITIAL : HANDSHAKE; |
| } |
| |
| QuicString QuicCryptoClientHandshaker::chlo_hash() const { |
| return chlo_hash_; |
| } |
| |
| bool QuicCryptoClientHandshaker::encryption_established() const { |
| return encryption_established_; |
| } |
| |
| bool QuicCryptoClientHandshaker::handshake_confirmed() const { |
| return handshake_confirmed_; |
| } |
| |
| const QuicCryptoNegotiatedParameters& |
| QuicCryptoClientHandshaker::crypto_negotiated_params() const { |
| return *crypto_negotiated_params_; |
| } |
| |
| CryptoMessageParser* QuicCryptoClientHandshaker::crypto_message_parser() { |
| return QuicCryptoHandshaker::crypto_message_parser(); |
| } |
| |
| void QuicCryptoClientHandshaker::HandleServerConfigUpdateMessage( |
| const CryptoHandshakeMessage& server_config_update) { |
| DCHECK(server_config_update.tag() == kSCUP); |
| QuicString error_details; |
| QuicCryptoClientConfig::CachedState* cached = |
| crypto_config_->LookupOrCreate(server_id_); |
| QuicErrorCode error = crypto_config_->ProcessServerConfigUpdate( |
| server_config_update, session()->connection()->clock()->WallNow(), |
| session()->connection()->transport_version(), chlo_hash_, cached, |
| crypto_negotiated_params_, &error_details); |
| |
| if (error != QUIC_NO_ERROR) { |
| stream_->CloseConnectionWithDetails( |
| error, "Server config update invalid: " + error_details); |
| return; |
| } |
| |
| DCHECK(handshake_confirmed()); |
| if (proof_verify_callback_) { |
| proof_verify_callback_->Cancel(); |
| } |
| next_state_ = STATE_INITIALIZE_SCUP; |
| DoHandshakeLoop(nullptr); |
| } |
| |
| void QuicCryptoClientHandshaker::DoHandshakeLoop( |
| const CryptoHandshakeMessage* in) { |
| QuicCryptoClientConfig::CachedState* cached = |
| crypto_config_->LookupOrCreate(server_id_); |
| |
| QuicAsyncStatus rv = QUIC_SUCCESS; |
| do { |
| CHECK_NE(STATE_NONE, next_state_); |
| const State state = next_state_; |
| next_state_ = STATE_IDLE; |
| rv = QUIC_SUCCESS; |
| switch (state) { |
| case STATE_INITIALIZE: |
| DoInitialize(cached); |
| break; |
| case STATE_SEND_CHLO: |
| DoSendCHLO(cached); |
| return; // return waiting to hear from server. |
| case STATE_RECV_REJ: |
| DoReceiveREJ(in, cached); |
| break; |
| case STATE_VERIFY_PROOF: |
| rv = DoVerifyProof(cached); |
| break; |
| case STATE_VERIFY_PROOF_COMPLETE: |
| DoVerifyProofComplete(cached); |
| break; |
| case STATE_GET_CHANNEL_ID: |
| rv = DoGetChannelID(cached); |
| break; |
| case STATE_GET_CHANNEL_ID_COMPLETE: |
| DoGetChannelIDComplete(); |
| break; |
| case STATE_RECV_SHLO: |
| DoReceiveSHLO(in, cached); |
| break; |
| case STATE_IDLE: |
| // This means that the peer sent us a message that we weren't expecting. |
| stream_->CloseConnectionWithDetails(QUIC_INVALID_CRYPTO_MESSAGE_TYPE, |
| "Handshake in idle state"); |
| return; |
| case STATE_INITIALIZE_SCUP: |
| DoInitializeServerConfigUpdate(cached); |
| break; |
| case STATE_NONE: |
| QUIC_NOTREACHED(); |
| return; // We are done. |
| } |
| } while (rv != QUIC_PENDING && next_state_ != STATE_NONE); |
| } |
| |
| void QuicCryptoClientHandshaker::DoInitialize( |
| QuicCryptoClientConfig::CachedState* cached) { |
| if (!cached->IsEmpty() && !cached->signature().empty()) { |
| // Note that we verify the proof even if the cached proof is valid. |
| // This allows us to respond to CA trust changes or certificate |
| // expiration because it may have been a while since we last verified |
| // the proof. |
| DCHECK(crypto_config_->proof_verifier()); |
| // Track proof verification time when cached server config is used. |
| proof_verify_start_time_ = session()->connection()->clock()->WallNow(); |
| chlo_hash_ = cached->chlo_hash(); |
| // If the cached state needs to be verified, do it now. |
| next_state_ = STATE_VERIFY_PROOF; |
| } else { |
| next_state_ = STATE_GET_CHANNEL_ID; |
| } |
| } |
| |
| void QuicCryptoClientHandshaker::DoSendCHLO( |
| QuicCryptoClientConfig::CachedState* cached) { |
| if (stateless_reject_received_) { |
| // If we've gotten to this point, we've sent at least one hello |
| // and received a stateless reject in response. We cannot |
| // continue to send hellos because the server has abandoned state |
| // for this connection. Abandon further handshakes. |
| next_state_ = STATE_NONE; |
| if (session()->connection()->connected()) { |
| session()->connection()->CloseConnection( |
| QUIC_CRYPTO_HANDSHAKE_STATELESS_REJECT, "stateless reject received", |
| ConnectionCloseBehavior::SILENT_CLOSE); |
| } |
| return; |
| } |
| |
| // Send the client hello in plaintext. |
| session()->connection()->SetDefaultEncryptionLevel(ENCRYPTION_NONE); |
| encryption_established_ = false; |
| if (num_client_hellos_ > QuicCryptoClientStream::kMaxClientHellos) { |
| stream_->CloseConnectionWithDetails( |
| QUIC_CRYPTO_TOO_MANY_REJECTS, |
| QuicStrCat("More than ", QuicCryptoClientStream::kMaxClientHellos, |
| " rejects")); |
| return; |
| } |
| num_client_hellos_++; |
| |
| CryptoHandshakeMessage out; |
| DCHECK(session() != nullptr); |
| DCHECK(session()->config() != nullptr); |
| // Send all the options, regardless of whether we're sending an |
| // inchoate or subsequent hello. |
| session()->config()->ToHandshakeMessage(&out); |
| |
| if (!cached->IsComplete(session()->connection()->clock()->WallNow())) { |
| crypto_config_->FillInchoateClientHello( |
| server_id_, session()->supported_versions().front(), cached, |
| session()->connection()->random_generator(), |
| /* demand_x509_proof= */ true, crypto_negotiated_params_, &out); |
| // Pad the inchoate client hello to fill up a packet. |
| const QuicByteCount kFramingOverhead = 50; // A rough estimate. |
| const QuicByteCount max_packet_size = |
| session()->connection()->max_packet_length(); |
| if (max_packet_size <= kFramingOverhead) { |
| QUIC_DLOG(DFATAL) << "max_packet_length (" << max_packet_size |
| << ") has no room for framing overhead."; |
| stream_->CloseConnectionWithDetails(QUIC_INTERNAL_ERROR, |
| "max_packet_size too smalll"); |
| return; |
| } |
| if (kClientHelloMinimumSize > max_packet_size - kFramingOverhead) { |
| QUIC_DLOG(DFATAL) << "Client hello won't fit in a single packet."; |
| stream_->CloseConnectionWithDetails(QUIC_INTERNAL_ERROR, |
| "CHLO too large"); |
| return; |
| } |
| next_state_ = STATE_RECV_REJ; |
| CryptoUtils::HashHandshakeMessage(out, &chlo_hash_, Perspective::IS_CLIENT); |
| session()->connection()->set_fully_pad_crypto_hadshake_packets( |
| crypto_config_->pad_inchoate_hello()); |
| SendHandshakeMessage(out); |
| return; |
| } |
| |
| // If the server nonce is empty, copy over the server nonce from a previous |
| // SREJ, if there is one. |
| if (GetQuicReloadableFlag(enable_quic_stateless_reject_support) && |
| crypto_negotiated_params_->server_nonce.empty() && |
| cached->has_server_nonce()) { |
| crypto_negotiated_params_->server_nonce = cached->GetNextServerNonce(); |
| DCHECK(!crypto_negotiated_params_->server_nonce.empty()); |
| } |
| |
| QuicString error_details; |
| QuicErrorCode error = crypto_config_->FillClientHello( |
| server_id_, session()->connection()->connection_id(), |
| session()->supported_versions().front(), cached, |
| session()->connection()->clock()->WallNow(), |
| session()->connection()->random_generator(), channel_id_key_.get(), |
| crypto_negotiated_params_, &out, &error_details); |
| if (error != QUIC_NO_ERROR) { |
| // Flush the cached config so that, if it's bad, the server has a |
| // chance to send us another in the future. |
| cached->InvalidateServerConfig(); |
| stream_->CloseConnectionWithDetails(error, error_details); |
| return; |
| } |
| CryptoUtils::HashHandshakeMessage(out, &chlo_hash_, Perspective::IS_CLIENT); |
| channel_id_sent_ = (channel_id_key_ != nullptr); |
| if (cached->proof_verify_details()) { |
| proof_handler_->OnProofVerifyDetailsAvailable( |
| *cached->proof_verify_details()); |
| } |
| next_state_ = STATE_RECV_SHLO; |
| session()->connection()->set_fully_pad_crypto_hadshake_packets( |
| crypto_config_->pad_full_hello()); |
| SendHandshakeMessage(out); |
| // Be prepared to decrypt with the new server write key. |
| session()->connection()->SetAlternativeDecrypter( |
| ENCRYPTION_INITIAL, |
| std::move(crypto_negotiated_params_->initial_crypters.decrypter), |
| true /* latch once used */); |
| // Send subsequent packets under encryption on the assumption that the |
| // server will accept the handshake. |
| session()->connection()->SetEncrypter( |
| ENCRYPTION_INITIAL, |
| std::move(crypto_negotiated_params_->initial_crypters.encrypter)); |
| session()->connection()->SetDefaultEncryptionLevel(ENCRYPTION_INITIAL); |
| |
| // TODO(ianswett): Merge ENCRYPTION_REESTABLISHED and |
| // ENCRYPTION_FIRST_ESTABLSIHED |
| encryption_established_ = true; |
| session()->OnCryptoHandshakeEvent(QuicSession::ENCRYPTION_REESTABLISHED); |
| } |
| |
| void QuicCryptoClientHandshaker::DoReceiveREJ( |
| const CryptoHandshakeMessage* in, |
| QuicCryptoClientConfig::CachedState* cached) { |
| // We sent a dummy CHLO because we didn't have enough information to |
| // perform a handshake, or we sent a full hello that the server |
| // rejected. Here we hope to have a REJ that contains the information |
| // that we need. |
| if ((in->tag() != kREJ) && (in->tag() != kSREJ)) { |
| next_state_ = STATE_NONE; |
| stream_->CloseConnectionWithDetails(QUIC_INVALID_CRYPTO_MESSAGE_TYPE, |
| "Expected REJ"); |
| return; |
| } |
| |
| QuicTagVector reject_reasons; |
| static_assert(sizeof(QuicTag) == sizeof(uint32_t), "header out of sync"); |
| if (in->GetTaglist(kRREJ, &reject_reasons) == QUIC_NO_ERROR) { |
| uint32_t packed_error = 0; |
| for (size_t i = 0; i < reject_reasons.size(); ++i) { |
| // HANDSHAKE_OK is 0 and don't report that as error. |
| if (reject_reasons[i] == HANDSHAKE_OK || reject_reasons[i] >= 32) { |
| continue; |
| } |
| HandshakeFailureReason reason = |
| static_cast<HandshakeFailureReason>(reject_reasons[i]); |
| packed_error |= 1 << (reason - 1); |
| } |
| DVLOG(1) << "Reasons for rejection: " << packed_error; |
| if (num_client_hellos_ == QuicCryptoClientStream::kMaxClientHellos) { |
| QuicClientSparseHistogram("QuicClientHelloRejectReasons.TooMany", |
| packed_error); |
| } |
| QuicClientSparseHistogram("QuicClientHelloRejectReasons.Secure", |
| packed_error); |
| } |
| |
| // Receipt of a REJ message means that the server received the CHLO |
| // so we can cancel and retransmissions. |
| session()->NeuterUnencryptedData(); |
| |
| stateless_reject_received_ = in->tag() == kSREJ; |
| QuicString error_details; |
| QuicErrorCode error = crypto_config_->ProcessRejection( |
| *in, session()->connection()->clock()->WallNow(), |
| session()->connection()->transport_version(), chlo_hash_, cached, |
| crypto_negotiated_params_, &error_details); |
| |
| if (error != QUIC_NO_ERROR) { |
| next_state_ = STATE_NONE; |
| stream_->CloseConnectionWithDetails(error, error_details); |
| return; |
| } |
| if (!cached->proof_valid()) { |
| if (!cached->signature().empty()) { |
| // Note that we only verify the proof if the cached proof is not |
| // valid. If the cached proof is valid here, someone else must have |
| // just added the server config to the cache and verified the proof, |
| // so we can assume no CA trust changes or certificate expiration |
| // has happened since then. |
| next_state_ = STATE_VERIFY_PROOF; |
| return; |
| } |
| } |
| next_state_ = STATE_GET_CHANNEL_ID; |
| } |
| |
| QuicAsyncStatus QuicCryptoClientHandshaker::DoVerifyProof( |
| QuicCryptoClientConfig::CachedState* cached) { |
| ProofVerifier* verifier = crypto_config_->proof_verifier(); |
| DCHECK(verifier); |
| next_state_ = STATE_VERIFY_PROOF_COMPLETE; |
| generation_counter_ = cached->generation_counter(); |
| |
| ProofVerifierCallbackImpl* proof_verify_callback = |
| new ProofVerifierCallbackImpl(this); |
| |
| verify_ok_ = false; |
| |
| QuicAsyncStatus status = verifier->VerifyProof( |
| server_id_.host(), server_id_.port(), cached->server_config(), |
| session()->connection()->transport_version(), chlo_hash_, cached->certs(), |
| cached->cert_sct(), cached->signature(), verify_context_.get(), |
| &verify_error_details_, &verify_details_, |
| std::unique_ptr<ProofVerifierCallback>(proof_verify_callback)); |
| |
| switch (status) { |
| case QUIC_PENDING: |
| proof_verify_callback_ = proof_verify_callback; |
| QUIC_DVLOG(1) << "Doing VerifyProof"; |
| break; |
| case QUIC_FAILURE: |
| break; |
| case QUIC_SUCCESS: |
| verify_ok_ = true; |
| break; |
| } |
| return status; |
| } |
| |
| void QuicCryptoClientHandshaker::DoVerifyProofComplete( |
| QuicCryptoClientConfig::CachedState* cached) { |
| if (!proof_verify_start_time_.IsZero()) { |
| QUIC_CLIENT_HISTOGRAM_TIMES( |
| "QuicSession.VerifyProofTime.CachedServerConfig", |
| QuicTime::Delta::FromMicroseconds( |
| session()->connection()->clock()->WallNow().ToUNIXMicroseconds() - |
| proof_verify_start_time_.ToUNIXMicroseconds()), |
| QuicTime::Delta::FromMilliseconds(1), QuicTime::Delta::FromSeconds(10), |
| 50, ""); |
| } |
| if (!verify_ok_) { |
| if (verify_details_) { |
| proof_handler_->OnProofVerifyDetailsAvailable(*verify_details_); |
| } |
| if (num_client_hellos_ == 0) { |
| cached->Clear(); |
| next_state_ = STATE_INITIALIZE; |
| return; |
| } |
| next_state_ = STATE_NONE; |
| QUIC_CLIENT_HISTOGRAM_BOOL("QuicVerifyProofFailed.HandshakeConfirmed", |
| handshake_confirmed(), ""); |
| stream_->CloseConnectionWithDetails( |
| QUIC_PROOF_INVALID, "Proof invalid: " + verify_error_details_); |
| return; |
| } |
| |
| // Check if generation_counter has changed between STATE_VERIFY_PROOF and |
| // STATE_VERIFY_PROOF_COMPLETE state changes. |
| if (generation_counter_ != cached->generation_counter()) { |
| next_state_ = STATE_VERIFY_PROOF; |
| } else { |
| SetCachedProofValid(cached); |
| cached->SetProofVerifyDetails(verify_details_.release()); |
| if (!handshake_confirmed()) { |
| next_state_ = STATE_GET_CHANNEL_ID; |
| } else { |
| // TODO: Enable Expect-Staple. https://crbug.com/631101 |
| next_state_ = STATE_NONE; |
| } |
| } |
| } |
| |
| QuicAsyncStatus QuicCryptoClientHandshaker::DoGetChannelID( |
| QuicCryptoClientConfig::CachedState* cached) { |
| next_state_ = STATE_GET_CHANNEL_ID_COMPLETE; |
| channel_id_key_.reset(); |
| if (!RequiresChannelID(cached)) { |
| next_state_ = STATE_SEND_CHLO; |
| return QUIC_SUCCESS; |
| } |
| |
| ChannelIDSourceCallbackImpl* channel_id_source_callback = |
| new ChannelIDSourceCallbackImpl(this); |
| QuicAsyncStatus status = crypto_config_->channel_id_source()->GetChannelIDKey( |
| server_id_.host(), &channel_id_key_, channel_id_source_callback); |
| |
| switch (status) { |
| case QUIC_PENDING: |
| channel_id_source_callback_ = channel_id_source_callback; |
| QUIC_DVLOG(1) << "Looking up channel ID"; |
| break; |
| case QUIC_FAILURE: |
| next_state_ = STATE_NONE; |
| delete channel_id_source_callback; |
| stream_->CloseConnectionWithDetails(QUIC_INVALID_CHANNEL_ID_SIGNATURE, |
| "Channel ID lookup failed"); |
| break; |
| case QUIC_SUCCESS: |
| delete channel_id_source_callback; |
| break; |
| } |
| return status; |
| } |
| |
| void QuicCryptoClientHandshaker::DoGetChannelIDComplete() { |
| if (!channel_id_key_.get()) { |
| next_state_ = STATE_NONE; |
| stream_->CloseConnectionWithDetails(QUIC_INVALID_CHANNEL_ID_SIGNATURE, |
| "Channel ID lookup failed"); |
| return; |
| } |
| next_state_ = STATE_SEND_CHLO; |
| } |
| |
| void QuicCryptoClientHandshaker::DoReceiveSHLO( |
| const CryptoHandshakeMessage* in, |
| QuicCryptoClientConfig::CachedState* cached) { |
| next_state_ = STATE_NONE; |
| // We sent a CHLO that we expected to be accepted and now we're |
| // hoping for a SHLO from the server to confirm that. First check |
| // to see whether the response was a reject, and if so, move on to |
| // the reject-processing state. |
| if ((in->tag() == kREJ) || (in->tag() == kSREJ)) { |
| // alternative_decrypter will be nullptr if the original alternative |
| // decrypter latched and became the primary decrypter. That happens |
| // if we received a message encrypted with the INITIAL key. |
| if (session()->connection()->alternative_decrypter() == nullptr) { |
| // The rejection was sent encrypted! |
| stream_->CloseConnectionWithDetails( |
| QUIC_CRYPTO_ENCRYPTION_LEVEL_INCORRECT, "encrypted REJ message"); |
| return; |
| } |
| next_state_ = STATE_RECV_REJ; |
| return; |
| } |
| |
| if (in->tag() != kSHLO) { |
| stream_->CloseConnectionWithDetails(QUIC_INVALID_CRYPTO_MESSAGE_TYPE, |
| "Expected SHLO or REJ"); |
| return; |
| } |
| |
| // alternative_decrypter will be nullptr if the original alternative |
| // decrypter latched and became the primary decrypter. That happens |
| // if we received a message encrypted with the INITIAL key. |
| if (session()->connection()->alternative_decrypter() != nullptr) { |
| // The server hello was sent without encryption. |
| stream_->CloseConnectionWithDetails(QUIC_CRYPTO_ENCRYPTION_LEVEL_INCORRECT, |
| "unencrypted SHLO message"); |
| return; |
| } |
| |
| QuicString error_details; |
| QuicErrorCode error = crypto_config_->ProcessServerHello( |
| *in, session()->connection()->connection_id(), |
| session()->connection()->version(), |
| session()->connection()->server_supported_versions(), cached, |
| crypto_negotiated_params_, &error_details); |
| |
| if (error != QUIC_NO_ERROR) { |
| stream_->CloseConnectionWithDetails( |
| error, "Server hello invalid: " + error_details); |
| return; |
| } |
| error = session()->config()->ProcessPeerHello(*in, SERVER, &error_details); |
| if (error != QUIC_NO_ERROR) { |
| stream_->CloseConnectionWithDetails( |
| error, "Server hello invalid: " + error_details); |
| return; |
| } |
| session()->OnConfigNegotiated(); |
| |
| CrypterPair* crypters = &crypto_negotiated_params_->forward_secure_crypters; |
| // TODO(agl): we don't currently latch this decrypter because the idea |
| // has been floated that the server shouldn't send packets encrypted |
| // with the FORWARD_SECURE key until it receives a FORWARD_SECURE |
| // packet from the client. |
| session()->connection()->SetAlternativeDecrypter( |
| ENCRYPTION_FORWARD_SECURE, std::move(crypters->decrypter), |
| false /* don't latch */); |
| session()->connection()->SetEncrypter(ENCRYPTION_FORWARD_SECURE, |
| std::move(crypters->encrypter)); |
| session()->connection()->SetDefaultEncryptionLevel(ENCRYPTION_FORWARD_SECURE); |
| |
| handshake_confirmed_ = true; |
| session()->OnCryptoHandshakeEvent(QuicSession::HANDSHAKE_CONFIRMED); |
| session()->connection()->OnHandshakeComplete(); |
| } |
| |
| void QuicCryptoClientHandshaker::DoInitializeServerConfigUpdate( |
| QuicCryptoClientConfig::CachedState* cached) { |
| bool update_ignored = false; |
| if (!cached->IsEmpty() && !cached->signature().empty()) { |
| // Note that we verify the proof even if the cached proof is valid. |
| DCHECK(crypto_config_->proof_verifier()); |
| next_state_ = STATE_VERIFY_PROOF; |
| } else { |
| update_ignored = true; |
| next_state_ = STATE_NONE; |
| } |
| QUIC_CLIENT_HISTOGRAM_COUNTS("QuicNumServerConfig.UpdateMessagesIgnored", |
| update_ignored, 1, 1000000, 50, ""); |
| } |
| |
| void QuicCryptoClientHandshaker::SetCachedProofValid( |
| QuicCryptoClientConfig::CachedState* cached) { |
| cached->SetProofValid(); |
| proof_handler_->OnProofValid(*cached); |
| } |
| |
| bool QuicCryptoClientHandshaker::RequiresChannelID( |
| QuicCryptoClientConfig::CachedState* cached) { |
| if (server_id_.privacy_mode_enabled() || |
| !crypto_config_->channel_id_source()) { |
| return false; |
| } |
| const CryptoHandshakeMessage* scfg = cached->GetServerConfig(); |
| if (!scfg) { // scfg may be null then we send an inchoate CHLO. |
| return false; |
| } |
| QuicTagVector their_proof_demands; |
| if (scfg->GetTaglist(kPDMD, &their_proof_demands) != QUIC_NO_ERROR) { |
| return false; |
| } |
| for (const QuicTag tag : their_proof_demands) { |
| if (tag == kCHID) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| } // namespace quic |