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// 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_versions.h"
#include <string>
#include "net/third_party/quiche/src/quic/core/crypto/quic_random.h"
#include "net/third_party/quiche/src/quic/core/quic_tag.h"
#include "net/third_party/quiche/src/quic/core/quic_types.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_arraysize.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_bug_tracker.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_endian.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_flag_utils.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_text_utils.h"
namespace quic {
namespace {
// Constructs a version label from the 4 bytes such that the on-the-wire
// order will be: d, c, b, a.
QuicVersionLabel MakeVersionLabel(char a, char b, char c, char d) {
return MakeQuicTag(d, c, b, a);
}
QuicVersionLabel CreateRandomVersionLabelForNegotiation() {
if (!GetQuicReloadableFlag(quic_version_negotiation_grease)) {
return MakeVersionLabel(0xda, 0x5a, 0x3a, 0x3a);
}
QUIC_RELOADABLE_FLAG_COUNT_N(quic_version_negotiation_grease, 2, 2);
QuicVersionLabel result;
if (!GetQuicFlag(FLAGS_quic_disable_version_negotiation_grease_randomness)) {
QuicRandom::GetInstance()->RandBytes(&result, sizeof(result));
} else {
result = MakeVersionLabel(0xd1, 0x57, 0x38, 0x3f);
}
result &= 0xf0f0f0f0;
result |= 0x0a0a0a0a;
return result;
}
} // namespace
bool ParsedQuicVersion::KnowsWhichDecrypterToUse() const {
return transport_version > QUIC_VERSION_46 ||
handshake_protocol == PROTOCOL_TLS1_3;
}
bool ParsedQuicVersion::UsesInitialObfuscators() const {
return transport_version > QUIC_VERSION_49 ||
handshake_protocol == PROTOCOL_TLS1_3;
}
bool ParsedQuicVersion::AllowsLowFlowControlLimits() const {
return transport_version == QUIC_VERSION_99 &&
handshake_protocol == PROTOCOL_TLS1_3;
}
bool ParsedQuicVersion::HasHeaderProtection() const {
return transport_version > QUIC_VERSION_49;
}
bool ParsedQuicVersion::SupportsRetry() const {
return transport_version > QUIC_VERSION_46;
}
bool ParsedQuicVersion::SendsVariableLengthPacketNumberInLongHeader() const {
return transport_version > QUIC_VERSION_46;
}
bool ParsedQuicVersion::SupportsClientConnectionIds() const {
return transport_version > QUIC_VERSION_48;
}
bool ParsedQuicVersion::HasLengthPrefixedConnectionIds() const {
return VersionHasLengthPrefixedConnectionIds(transport_version);
}
bool ParsedQuicVersion::SupportsAntiAmplificationLimit() const {
return transport_version == QUIC_VERSION_99 &&
handshake_protocol == PROTOCOL_TLS1_3;
}
bool VersionHasLengthPrefixedConnectionIds(
QuicTransportVersion transport_version) {
return transport_version > QUIC_VERSION_48;
}
std::ostream& operator<<(std::ostream& os, const ParsedQuicVersion& version) {
os << ParsedQuicVersionToString(version);
return os;
}
QuicVersionLabel CreateQuicVersionLabel(ParsedQuicVersion parsed_version) {
char proto = 0;
switch (parsed_version.handshake_protocol) {
case PROTOCOL_QUIC_CRYPTO:
proto = 'Q';
break;
case PROTOCOL_TLS1_3:
proto = 'T';
break;
default:
QUIC_BUG << "Invalid HandshakeProtocol: "
<< parsed_version.handshake_protocol;
return 0;
}
static_assert(QUIC_ARRAYSIZE(kSupportedTransportVersions) == 6u,
"Supported versions out of sync");
switch (parsed_version.transport_version) {
case QUIC_VERSION_43:
return MakeVersionLabel(proto, '0', '4', '3');
case QUIC_VERSION_46:
return MakeVersionLabel(proto, '0', '4', '6');
case QUIC_VERSION_48:
return MakeVersionLabel(proto, '0', '4', '8');
case QUIC_VERSION_49:
return MakeVersionLabel(proto, '0', '4', '9');
case QUIC_VERSION_50:
return MakeVersionLabel(proto, '0', '5', '0');
case QUIC_VERSION_99:
if (parsed_version.handshake_protocol == PROTOCOL_TLS1_3) {
return MakeVersionLabel(0xff, 0x00, 0x00, kQuicIetfDraftVersion);
}
return MakeVersionLabel(proto, '0', '9', '9');
case QUIC_VERSION_RESERVED_FOR_NEGOTIATION:
return CreateRandomVersionLabelForNegotiation();
default:
// This is a bug because we should never attempt to convert an invalid
// QuicTransportVersion to be written to the wire.
QUIC_BUG << "Unsupported QuicTransportVersion: "
<< parsed_version.transport_version;
return 0;
}
}
QuicVersionLabelVector CreateQuicVersionLabelVector(
const ParsedQuicVersionVector& versions) {
QuicVersionLabelVector out;
out.reserve(versions.size());
for (const auto& version : versions) {
out.push_back(CreateQuicVersionLabel(version));
}
return out;
}
ParsedQuicVersion ParseQuicVersionLabel(QuicVersionLabel version_label) {
std::vector<HandshakeProtocol> protocols = {PROTOCOL_QUIC_CRYPTO,
PROTOCOL_TLS1_3};
for (QuicTransportVersion version : kSupportedTransportVersions) {
for (HandshakeProtocol handshake : protocols) {
if (version_label ==
CreateQuicVersionLabel(ParsedQuicVersion(handshake, version))) {
return ParsedQuicVersion(handshake, version);
}
}
}
// Reading from the client so this should not be considered an ERROR.
QUIC_DLOG(INFO) << "Unsupported QuicVersionLabel version: "
<< QuicVersionLabelToString(version_label);
return UnsupportedQuicVersion();
}
ParsedQuicVersion ParseQuicVersionString(std::string version_string) {
if (version_string.empty()) {
return UnsupportedQuicVersion();
}
int quic_version_number = 0;
if (QuicTextUtils::StringToInt(version_string, &quic_version_number) &&
quic_version_number > 0) {
return ParsedQuicVersion(
PROTOCOL_QUIC_CRYPTO,
static_cast<QuicTransportVersion>(quic_version_number));
}
std::vector<HandshakeProtocol> protocols = {PROTOCOL_QUIC_CRYPTO};
if (GetQuicReloadableFlag(quic_supports_tls_handshake)) {
protocols.push_back(PROTOCOL_TLS1_3);
}
for (QuicTransportVersion version : kSupportedTransportVersions) {
for (HandshakeProtocol handshake : protocols) {
const ParsedQuicVersion parsed_version =
ParsedQuicVersion(handshake, version);
if (version_string == ParsedQuicVersionToString(parsed_version)) {
return parsed_version;
}
}
}
// Still recognize T099 even if flag quic_ietf_draft_version has been changed.
if (GetQuicReloadableFlag(quic_supports_tls_handshake) &&
version_string == "T099") {
return ParsedQuicVersion(PROTOCOL_TLS1_3, QUIC_VERSION_99);
}
// Reading from the client so this should not be considered an ERROR.
QUIC_DLOG(INFO) << "Unsupported QUIC version string: \"" << version_string
<< "\".";
return UnsupportedQuicVersion();
}
QuicTransportVersionVector AllSupportedTransportVersions() {
QuicTransportVersionVector supported_versions;
for (QuicTransportVersion version : kSupportedTransportVersions) {
supported_versions.push_back(version);
}
return supported_versions;
}
ParsedQuicVersionVector AllSupportedVersions() {
ParsedQuicVersionVector supported_versions;
for (HandshakeProtocol protocol : kSupportedHandshakeProtocols) {
for (QuicTransportVersion version : kSupportedTransportVersions) {
if (protocol == PROTOCOL_TLS1_3 &&
!QuicVersionUsesCryptoFrames(version)) {
// The TLS handshake is only deployable if CRYPTO frames are also used.
continue;
}
supported_versions.push_back(ParsedQuicVersion(protocol, version));
}
}
return supported_versions;
}
// TODO(nharper): Remove this function when it is no longer in use.
QuicTransportVersionVector CurrentSupportedTransportVersions() {
return FilterSupportedTransportVersions(AllSupportedTransportVersions());
}
ParsedQuicVersionVector CurrentSupportedVersions() {
return FilterSupportedVersions(AllSupportedVersions());
}
// TODO(nharper): Remove this function when it is no longer in use.
QuicTransportVersionVector FilterSupportedTransportVersions(
QuicTransportVersionVector versions) {
ParsedQuicVersionVector parsed_versions;
for (QuicTransportVersion version : versions) {
parsed_versions.push_back(ParsedQuicVersion(PROTOCOL_QUIC_CRYPTO, version));
}
ParsedQuicVersionVector filtered_parsed_versions =
FilterSupportedVersions(parsed_versions);
QuicTransportVersionVector filtered_versions;
for (ParsedQuicVersion version : filtered_parsed_versions) {
filtered_versions.push_back(version.transport_version);
}
return filtered_versions;
}
ParsedQuicVersionVector FilterSupportedVersions(
ParsedQuicVersionVector versions) {
ParsedQuicVersionVector filtered_versions;
filtered_versions.reserve(versions.size());
for (ParsedQuicVersion version : versions) {
if (version.handshake_protocol == PROTOCOL_TLS1_3 &&
!GetQuicReloadableFlag(quic_supports_tls_handshake)) {
continue;
}
if (version.transport_version == QUIC_VERSION_99) {
if (GetQuicReloadableFlag(quic_enable_version_99)) {
filtered_versions.push_back(version);
}
} else if (version.transport_version == QUIC_VERSION_50) {
if (GetQuicReloadableFlag(quic_enable_version_50)) {
filtered_versions.push_back(version);
}
} else if (version.transport_version == QUIC_VERSION_49) {
if (GetQuicReloadableFlag(quic_enable_version_49)) {
filtered_versions.push_back(version);
}
} else {
filtered_versions.push_back(version);
}
}
return filtered_versions;
}
QuicTransportVersionVector VersionOfIndex(
const QuicTransportVersionVector& versions,
int index) {
QuicTransportVersionVector version;
int version_count = versions.size();
if (index >= 0 && index < version_count) {
version.push_back(versions[index]);
} else {
version.push_back(QUIC_VERSION_UNSUPPORTED);
}
return version;
}
ParsedQuicVersionVector ParsedVersionOfIndex(
const ParsedQuicVersionVector& versions,
int index) {
ParsedQuicVersionVector version;
int version_count = versions.size();
if (index >= 0 && index < version_count) {
version.push_back(versions[index]);
} else {
version.push_back(UnsupportedQuicVersion());
}
return version;
}
QuicTransportVersionVector ParsedVersionsToTransportVersions(
const ParsedQuicVersionVector& versions) {
QuicTransportVersionVector transport_versions;
transport_versions.resize(versions.size());
for (size_t i = 0; i < versions.size(); ++i) {
transport_versions[i] = versions[i].transport_version;
}
return transport_versions;
}
QuicVersionLabel QuicVersionToQuicVersionLabel(
QuicTransportVersion transport_version) {
return CreateQuicVersionLabel(
ParsedQuicVersion(PROTOCOL_QUIC_CRYPTO, transport_version));
}
std::string QuicVersionLabelToString(QuicVersionLabel version_label) {
return QuicTagToString(QuicEndian::HostToNet32(version_label));
}
std::string QuicVersionLabelVectorToString(
const QuicVersionLabelVector& version_labels,
const std::string& separator,
size_t skip_after_nth_version) {
std::string result;
for (size_t i = 0; i < version_labels.size(); ++i) {
if (i != 0) {
result.append(separator);
}
if (i > skip_after_nth_version) {
result.append("...");
break;
}
result.append(QuicVersionLabelToString(version_labels[i]));
}
return result;
}
QuicTransportVersion QuicVersionLabelToQuicVersion(
QuicVersionLabel version_label) {
return ParseQuicVersionLabel(version_label).transport_version;
}
HandshakeProtocol QuicVersionLabelToHandshakeProtocol(
QuicVersionLabel version_label) {
return ParseQuicVersionLabel(version_label).handshake_protocol;
}
#define RETURN_STRING_LITERAL(x) \
case x: \
return #x
std::string QuicVersionToString(QuicTransportVersion transport_version) {
static_assert(QUIC_ARRAYSIZE(kSupportedTransportVersions) == 6u,
"Supported versions out of sync");
switch (transport_version) {
RETURN_STRING_LITERAL(QUIC_VERSION_43);
RETURN_STRING_LITERAL(QUIC_VERSION_46);
RETURN_STRING_LITERAL(QUIC_VERSION_48);
RETURN_STRING_LITERAL(QUIC_VERSION_49);
RETURN_STRING_LITERAL(QUIC_VERSION_50);
RETURN_STRING_LITERAL(QUIC_VERSION_99);
default:
return "QUIC_VERSION_UNSUPPORTED";
}
}
std::string ParsedQuicVersionToString(ParsedQuicVersion version) {
if (version == UnsupportedQuicVersion()) {
return "0";
}
return QuicVersionLabelToString(CreateQuicVersionLabel(version));
}
std::string QuicTransportVersionVectorToString(
const QuicTransportVersionVector& versions) {
std::string result = "";
for (size_t i = 0; i < versions.size(); ++i) {
if (i != 0) {
result.append(",");
}
result.append(QuicVersionToString(versions[i]));
}
return result;
}
std::string ParsedQuicVersionVectorToString(
const ParsedQuicVersionVector& versions,
const std::string& separator,
size_t skip_after_nth_version) {
std::string result;
for (size_t i = 0; i < versions.size(); ++i) {
if (i != 0) {
result.append(separator);
}
if (i > skip_after_nth_version) {
result.append("...");
break;
}
result.append(ParsedQuicVersionToString(versions[i]));
}
return result;
}
bool VersionSupportsGoogleAltSvcFormat(QuicTransportVersion transport_version) {
return transport_version <= QUIC_VERSION_46;
}
bool QuicVersionLabelUses4BitConnectionIdLength(
QuicVersionLabel version_label) {
// As we deprecate old versions, we still need the ability to send valid
// version negotiation packets for those versions. This function keeps track
// of the versions that ever supported the 4bit connection ID length encoding
// that we know about. Google QUIC 43 and earlier used a different encoding,
// and Google QUIC 49 and later use the new length prefixed encoding.
// Similarly, only IETF drafts 11 to 21 used this encoding.
// Check Q044, Q045, Q046, Q047 and Q048.
for (uint8_t c = '4'; c <= '8'; ++c) {
if (version_label == MakeVersionLabel('Q', '0', '4', c)) {
return true;
}
}
// Check T048.
if (version_label == MakeVersionLabel('T', '0', '4', '8')) {
return true;
}
// Check IETF draft versions in [11,21].
for (uint8_t draft_number = 11; draft_number <= 21; ++draft_number) {
if (version_label == MakeVersionLabel(0xff, 0x00, 0x00, draft_number)) {
return true;
}
}
return false;
}
ParsedQuicVersion UnsupportedQuicVersion() {
return ParsedQuicVersion(PROTOCOL_UNSUPPORTED, QUIC_VERSION_UNSUPPORTED);
}
ParsedQuicVersion QuicVersionReservedForNegotiation() {
return ParsedQuicVersion(PROTOCOL_QUIC_CRYPTO,
QUIC_VERSION_RESERVED_FOR_NEGOTIATION);
}
std::string AlpnForVersion(ParsedQuicVersion parsed_version) {
if (parsed_version.handshake_protocol == PROTOCOL_TLS1_3 &&
parsed_version.transport_version == QUIC_VERSION_99) {
return "h3-" + QuicTextUtils::Uint64ToString(kQuicIetfDraftVersion);
}
return "h3-" + ParsedQuicVersionToString(parsed_version);
}
void QuicVersionInitializeSupportForIetfDraft() {
// Enable necessary flags.
SetQuicReloadableFlag(quic_supports_tls_handshake, true);
SetQuicReloadableFlag(quic_simplify_stop_waiting, true);
}
void QuicEnableVersion(ParsedQuicVersion parsed_version) {
if (parsed_version.handshake_protocol == PROTOCOL_TLS1_3) {
SetQuicReloadableFlag(quic_supports_tls_handshake, true);
}
static_assert(QUIC_ARRAYSIZE(kSupportedTransportVersions) == 6u,
"Supported versions out of sync");
if (parsed_version.transport_version == QUIC_VERSION_99) {
SetQuicReloadableFlag(quic_enable_version_99, true);
}
if (parsed_version.transport_version == QUIC_VERSION_50) {
SetQuicReloadableFlag(quic_enable_version_50, true);
}
if (parsed_version.transport_version == QUIC_VERSION_49) {
SetQuicReloadableFlag(quic_enable_version_49, true);
}
}
#undef RETURN_STRING_LITERAL // undef for jumbo builds
} // namespace quic