| // Copyright (c) 2016 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/quic/core/chlo_extractor.h" |
| |
| #include "net/third_party/quic/core/crypto/crypto_framer.h" |
| #include "net/third_party/quic/core/crypto/crypto_handshake_message.h" |
| #include "net/third_party/quic/core/crypto/crypto_protocol.h" |
| #include "net/third_party/quic/core/crypto/quic_decrypter.h" |
| #include "net/third_party/quic/core/crypto/quic_encrypter.h" |
| #include "net/third_party/quic/core/quic_framer.h" |
| #include "net/third_party/quic/core/quic_utils.h" |
| #include "net/third_party/quic/platform/api/quic_string_piece.h" |
| #include "net/third_party/quic/platform/api/quic_text_utils.h" |
| |
| namespace quic { |
| |
| namespace { |
| |
| class ChloFramerVisitor : public QuicFramerVisitorInterface, |
| public CryptoFramerVisitorInterface { |
| public: |
| ChloFramerVisitor(QuicFramer* framer, |
| const QuicTagVector& create_session_tag_indicators, |
| ChloExtractor::Delegate* delegate); |
| |
| ~ChloFramerVisitor() override = default; |
| |
| // QuicFramerVisitorInterface implementation |
| void OnError(QuicFramer* framer) override {} |
| bool OnProtocolVersionMismatch(ParsedQuicVersion version, |
| PacketHeaderFormat form) override; |
| void OnPacket() override {} |
| void OnPublicResetPacket(const QuicPublicResetPacket& packet) override {} |
| void OnVersionNegotiationPacket( |
| const QuicVersionNegotiationPacket& packet) override {} |
| bool OnUnauthenticatedPublicHeader(const QuicPacketHeader& header) override; |
| bool OnUnauthenticatedHeader(const QuicPacketHeader& header) override; |
| void OnDecryptedPacket(EncryptionLevel level) override {} |
| bool OnPacketHeader(const QuicPacketHeader& header) override; |
| void OnCoalescedPacket(const QuicEncryptedPacket& packet) override; |
| bool OnStreamFrame(const QuicStreamFrame& frame) override; |
| bool OnCryptoFrame(const QuicCryptoFrame& frame) override; |
| bool OnAckFrameStart(QuicPacketNumber largest_acked, |
| QuicTime::Delta ack_delay_time) override; |
| bool OnAckRange(QuicPacketNumber start, QuicPacketNumber end) override; |
| bool OnAckTimestamp(QuicPacketNumber packet_number, |
| QuicTime timestamp) override; |
| bool OnAckFrameEnd(QuicPacketNumber start) override; |
| bool OnStopWaitingFrame(const QuicStopWaitingFrame& frame) override; |
| bool OnPingFrame(const QuicPingFrame& frame) override; |
| bool OnRstStreamFrame(const QuicRstStreamFrame& frame) override; |
| bool OnConnectionCloseFrame(const QuicConnectionCloseFrame& frame) override; |
| bool OnApplicationCloseFrame(const QuicApplicationCloseFrame& frame) override; |
| bool OnNewConnectionIdFrame(const QuicNewConnectionIdFrame& frame) override; |
| bool OnRetireConnectionIdFrame( |
| const QuicRetireConnectionIdFrame& frame) override; |
| bool OnNewTokenFrame(const QuicNewTokenFrame& frame) override; |
| bool OnStopSendingFrame(const QuicStopSendingFrame& frame) override; |
| bool OnPathChallengeFrame(const QuicPathChallengeFrame& frame) override; |
| bool OnPathResponseFrame(const QuicPathResponseFrame& frame) override; |
| bool OnGoAwayFrame(const QuicGoAwayFrame& frame) override; |
| bool OnMaxStreamIdFrame(const QuicMaxStreamIdFrame& frame) override; |
| bool OnStreamIdBlockedFrame(const QuicStreamIdBlockedFrame& frame) override; |
| bool OnWindowUpdateFrame(const QuicWindowUpdateFrame& frame) override; |
| bool OnBlockedFrame(const QuicBlockedFrame& frame) override; |
| bool OnPaddingFrame(const QuicPaddingFrame& frame) override; |
| bool OnMessageFrame(const QuicMessageFrame& frame) override; |
| void OnPacketComplete() override {} |
| bool IsValidStatelessResetToken(QuicUint128 token) const override; |
| void OnAuthenticatedIetfStatelessResetPacket( |
| const QuicIetfStatelessResetPacket& packet) override {} |
| |
| // CryptoFramerVisitorInterface implementation. |
| void OnError(CryptoFramer* framer) override; |
| void OnHandshakeMessage(const CryptoHandshakeMessage& message) override; |
| |
| // Shared implementation between OnStreamFrame and OnCryptoFrame. |
| bool OnHandshakeData(QuicStringPiece data); |
| |
| bool found_chlo() { return found_chlo_; } |
| bool chlo_contains_tags() { return chlo_contains_tags_; } |
| |
| private: |
| QuicFramer* framer_; |
| const QuicTagVector& create_session_tag_indicators_; |
| ChloExtractor::Delegate* delegate_; |
| bool found_chlo_; |
| bool chlo_contains_tags_; |
| QuicConnectionId connection_id_; |
| }; |
| |
| ChloFramerVisitor::ChloFramerVisitor( |
| QuicFramer* framer, |
| const QuicTagVector& create_session_tag_indicators, |
| ChloExtractor::Delegate* delegate) |
| : framer_(framer), |
| create_session_tag_indicators_(create_session_tag_indicators), |
| delegate_(delegate), |
| found_chlo_(false), |
| chlo_contains_tags_(false), |
| connection_id_(EmptyQuicConnectionId()) {} |
| |
| bool ChloFramerVisitor::OnProtocolVersionMismatch(ParsedQuicVersion version, |
| PacketHeaderFormat /*form*/) { |
| if (!framer_->IsSupportedVersion(version)) { |
| return false; |
| } |
| framer_->set_version(version); |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnUnauthenticatedPublicHeader( |
| const QuicPacketHeader& header) { |
| connection_id_ = header.destination_connection_id; |
| return true; |
| } |
| bool ChloFramerVisitor::OnUnauthenticatedHeader( |
| const QuicPacketHeader& header) { |
| return true; |
| } |
| bool ChloFramerVisitor::OnPacketHeader(const QuicPacketHeader& header) { |
| return true; |
| } |
| void ChloFramerVisitor::OnCoalescedPacket(const QuicEncryptedPacket& packet) {} |
| bool ChloFramerVisitor::OnStreamFrame(const QuicStreamFrame& frame) { |
| if (framer_->transport_version() >= QUIC_VERSION_47) { |
| // CHLO will be sent in CRYPTO frames in v47 and above. |
| return false; |
| } |
| QuicStringPiece data(frame.data_buffer, frame.data_length); |
| if (frame.stream_id == |
| QuicUtils::GetCryptoStreamId(framer_->transport_version()) && |
| frame.offset == 0 && QuicTextUtils::StartsWith(data, "CHLO")) { |
| return OnHandshakeData(data); |
| } |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnCryptoFrame(const QuicCryptoFrame& frame) { |
| if (framer_->transport_version() < QUIC_VERSION_47) { |
| // CHLO will be in stream frames before v47. |
| return false; |
| } |
| QuicStringPiece data(frame.data_buffer, frame.data_length); |
| if (frame.offset == 0 && QuicTextUtils::StartsWith(data, "CHLO")) { |
| return OnHandshakeData(data); |
| } |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnHandshakeData(QuicStringPiece data) { |
| CryptoFramer crypto_framer; |
| crypto_framer.set_visitor(this); |
| if (!crypto_framer.ProcessInput(data)) { |
| return false; |
| } |
| // Interrogate the crypto framer and see if there are any |
| // intersecting tags between what we saw in the maybe-CHLO and the |
| // indicator set. |
| for (const QuicTag tag : create_session_tag_indicators_) { |
| if (crypto_framer.HasTag(tag)) { |
| chlo_contains_tags_ = true; |
| } |
| } |
| if (chlo_contains_tags_ && delegate_) { |
| // Unfortunately, because this is a partial CHLO, |
| // OnHandshakeMessage was never called, so the ALPN was never |
| // extracted. Fake it up a bit and send it to the delegate so that |
| // the correct dispatch can happen. |
| crypto_framer.ForceHandshake(); |
| } |
| |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnAckFrameStart(QuicPacketNumber /*largest_acked*/, |
| QuicTime::Delta /*ack_delay_time*/) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnAckRange(QuicPacketNumber /*start*/, |
| QuicPacketNumber /*end*/) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnAckTimestamp(QuicPacketNumber /*packet_number*/, |
| QuicTime /*timestamp*/) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnAckFrameEnd(QuicPacketNumber /*start*/) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnStopWaitingFrame(const QuicStopWaitingFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnPingFrame(const QuicPingFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnRstStreamFrame(const QuicRstStreamFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnConnectionCloseFrame( |
| const QuicConnectionCloseFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnApplicationCloseFrame( |
| const QuicApplicationCloseFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnStopSendingFrame(const QuicStopSendingFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnPathChallengeFrame( |
| const QuicPathChallengeFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnPathResponseFrame( |
| const QuicPathResponseFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnGoAwayFrame(const QuicGoAwayFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnWindowUpdateFrame( |
| const QuicWindowUpdateFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnBlockedFrame(const QuicBlockedFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnNewConnectionIdFrame( |
| const QuicNewConnectionIdFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnRetireConnectionIdFrame( |
| const QuicRetireConnectionIdFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnNewTokenFrame(const QuicNewTokenFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnPaddingFrame(const QuicPaddingFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnMessageFrame(const QuicMessageFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::IsValidStatelessResetToken(QuicUint128 token) const { |
| return false; |
| } |
| |
| bool ChloFramerVisitor::OnMaxStreamIdFrame(const QuicMaxStreamIdFrame& frame) { |
| return true; |
| } |
| |
| bool ChloFramerVisitor::OnStreamIdBlockedFrame( |
| const QuicStreamIdBlockedFrame& frame) { |
| return true; |
| } |
| |
| void ChloFramerVisitor::OnError(CryptoFramer* framer) {} |
| |
| void ChloFramerVisitor::OnHandshakeMessage( |
| const CryptoHandshakeMessage& message) { |
| if (delegate_ != nullptr) { |
| delegate_->OnChlo(framer_->transport_version(), connection_id_, message); |
| } |
| found_chlo_ = true; |
| } |
| |
| } // namespace |
| |
| // static |
| bool ChloExtractor::Extract(const QuicEncryptedPacket& packet, |
| const ParsedQuicVersionVector& versions, |
| const QuicTagVector& create_session_tag_indicators, |
| Delegate* delegate) { |
| QuicFramer framer(versions, QuicTime::Zero(), Perspective::IS_SERVER); |
| ChloFramerVisitor visitor(&framer, create_session_tag_indicators, delegate); |
| framer.set_visitor(&visitor); |
| if (!framer.ProcessPacket(packet)) { |
| return false; |
| } |
| return visitor.found_chlo() || visitor.chlo_contains_tags(); |
| } |
| |
| } // namespace quic |