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// Copyright 2013 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/crypto/quic_crypto_client_config.h"
#include <algorithm>
#include <memory>
#include <string>
#include "absl/base/macros.h"
#include "absl/memory/memory.h"
#include "absl/strings/match.h"
#include "absl/strings/string_view.h"
#include "third_party/boringssl/src/include/openssl/ssl.h"
#include "quic/core/crypto/cert_compressor.h"
#include "quic/core/crypto/chacha20_poly1305_encrypter.h"
#include "quic/core/crypto/common_cert_set.h"
#include "quic/core/crypto/crypto_framer.h"
#include "quic/core/crypto/crypto_protocol.h"
#include "quic/core/crypto/crypto_utils.h"
#include "quic/core/crypto/curve25519_key_exchange.h"
#include "quic/core/crypto/key_exchange.h"
#include "quic/core/crypto/p256_key_exchange.h"
#include "quic/core/crypto/proof_verifier.h"
#include "quic/core/crypto/quic_encrypter.h"
#include "quic/core/crypto/quic_random.h"
#include "quic/core/crypto/tls_client_connection.h"
#include "quic/core/quic_connection_id.h"
#include "quic/core/quic_types.h"
#include "quic/core/quic_utils.h"
#include "quic/platform/api/quic_bug_tracker.h"
#include "quic/platform/api/quic_client_stats.h"
#include "quic/platform/api/quic_hostname_utils.h"
#include "quic/platform/api/quic_logging.h"
namespace quic {
namespace {
// Tracks the reason (the state of the server config) for sending inchoate
// ClientHello to the server.
void RecordInchoateClientHelloReason(
QuicCryptoClientConfig::CachedState::ServerConfigState state) {
QUIC_CLIENT_HISTOGRAM_ENUM(
"QuicInchoateClientHelloReason", state,
QuicCryptoClientConfig::CachedState::SERVER_CONFIG_COUNT, "");
}
// Tracks the state of the QUIC server information loaded from the disk cache.
void RecordDiskCacheServerConfigState(
QuicCryptoClientConfig::CachedState::ServerConfigState state) {
QUIC_CLIENT_HISTOGRAM_ENUM(
"QuicServerInfo.DiskCacheState", state,
QuicCryptoClientConfig::CachedState::SERVER_CONFIG_COUNT, "");
}
} // namespace
QuicCryptoClientConfig::QuicCryptoClientConfig(
std::unique_ptr<ProofVerifier> proof_verifier)
: QuicCryptoClientConfig(std::move(proof_verifier), nullptr) {}
QuicCryptoClientConfig::QuicCryptoClientConfig(
std::unique_ptr<ProofVerifier> proof_verifier,
std::unique_ptr<SessionCache> session_cache)
: proof_verifier_(std::move(proof_verifier)),
session_cache_(std::move(session_cache)),
ssl_ctx_(TlsClientConnection::CreateSslCtx(
!GetQuicFlag(FLAGS_quic_disable_client_tls_zero_rtt))) {
QUICHE_DCHECK(proof_verifier_.get());
SetDefaults();
}
QuicCryptoClientConfig::~QuicCryptoClientConfig() {}
QuicCryptoClientConfig::CachedState::CachedState()
: server_config_valid_(false),
expiration_time_(QuicWallTime::Zero()),
generation_counter_(0) {}
QuicCryptoClientConfig::CachedState::~CachedState() {}
bool QuicCryptoClientConfig::CachedState::IsComplete(QuicWallTime now) const {
if (server_config_.empty()) {
RecordInchoateClientHelloReason(SERVER_CONFIG_EMPTY);
return false;
}
if (!server_config_valid_) {
RecordInchoateClientHelloReason(SERVER_CONFIG_INVALID);
return false;
}
const CryptoHandshakeMessage* scfg = GetServerConfig();
if (!scfg) {
// Should be impossible short of cache corruption.
RecordInchoateClientHelloReason(SERVER_CONFIG_CORRUPTED);
QUICHE_DCHECK(false);
return false;
}
if (now.IsBefore(expiration_time_)) {
return true;
}
QUIC_CLIENT_HISTOGRAM_TIMES(
"QuicClientHelloServerConfig.InvalidDuration",
QuicTime::Delta::FromSeconds(now.ToUNIXSeconds() -
expiration_time_.ToUNIXSeconds()),
QuicTime::Delta::FromSeconds(60), // 1 min.
QuicTime::Delta::FromSeconds(20 * 24 * 3600), // 20 days.
50, "");
RecordInchoateClientHelloReason(SERVER_CONFIG_EXPIRED);
return false;
}
bool QuicCryptoClientConfig::CachedState::IsEmpty() const {
return server_config_.empty();
}
const CryptoHandshakeMessage*
QuicCryptoClientConfig::CachedState::GetServerConfig() const {
if (server_config_.empty()) {
return nullptr;
}
if (!scfg_) {
scfg_ = CryptoFramer::ParseMessage(server_config_);
QUICHE_DCHECK(scfg_.get());
}
return scfg_.get();
}
QuicCryptoClientConfig::CachedState::ServerConfigState
QuicCryptoClientConfig::CachedState::SetServerConfig(
absl::string_view server_config,
QuicWallTime now,
QuicWallTime expiry_time,
std::string* error_details) {
const bool matches_existing = server_config == server_config_;
// Even if the new server config matches the existing one, we still wish to
// reject it if it has expired.
std::unique_ptr<CryptoHandshakeMessage> new_scfg_storage;
const CryptoHandshakeMessage* new_scfg;
if (!matches_existing) {
new_scfg_storage = CryptoFramer::ParseMessage(server_config);
new_scfg = new_scfg_storage.get();
} else {
new_scfg = GetServerConfig();
}
if (!new_scfg) {
*error_details = "SCFG invalid";
return SERVER_CONFIG_INVALID;
}
if (expiry_time.IsZero()) {
uint64_t expiry_seconds;
if (new_scfg->GetUint64(kEXPY, &expiry_seconds) != QUIC_NO_ERROR) {
*error_details = "SCFG missing EXPY";
return SERVER_CONFIG_INVALID_EXPIRY;
}
expiration_time_ = QuicWallTime::FromUNIXSeconds(expiry_seconds);
} else {
expiration_time_ = expiry_time;
}
if (now.IsAfter(expiration_time_)) {
*error_details = "SCFG has expired";
return SERVER_CONFIG_EXPIRED;
}
if (!matches_existing) {
server_config_ = std::string(server_config);
SetProofInvalid();
scfg_ = std::move(new_scfg_storage);
}
return SERVER_CONFIG_VALID;
}
void QuicCryptoClientConfig::CachedState::InvalidateServerConfig() {
server_config_.clear();
scfg_.reset();
SetProofInvalid();
}
void QuicCryptoClientConfig::CachedState::SetProof(
const std::vector<std::string>& certs,
absl::string_view cert_sct,
absl::string_view chlo_hash,
absl::string_view signature) {
bool has_changed = signature != server_config_sig_ ||
chlo_hash != chlo_hash_ || certs_.size() != certs.size();
if (!has_changed) {
for (size_t i = 0; i < certs_.size(); i++) {
if (certs_[i] != certs[i]) {
has_changed = true;
break;
}
}
}
if (!has_changed) {
return;
}
// If the proof has changed then it needs to be revalidated.
SetProofInvalid();
certs_ = certs;
cert_sct_ = std::string(cert_sct);
chlo_hash_ = std::string(chlo_hash);
server_config_sig_ = std::string(signature);
}
void QuicCryptoClientConfig::CachedState::Clear() {
server_config_.clear();
source_address_token_.clear();
certs_.clear();
cert_sct_.clear();
chlo_hash_.clear();
server_config_sig_.clear();
server_config_valid_ = false;
proof_verify_details_.reset();
scfg_.reset();
++generation_counter_;
}
void QuicCryptoClientConfig::CachedState::ClearProof() {
SetProofInvalid();
certs_.clear();
cert_sct_.clear();
chlo_hash_.clear();
server_config_sig_.clear();
}
void QuicCryptoClientConfig::CachedState::SetProofValid() {
server_config_valid_ = true;
}
void QuicCryptoClientConfig::CachedState::SetProofInvalid() {
server_config_valid_ = false;
++generation_counter_;
}
bool QuicCryptoClientConfig::CachedState::Initialize(
absl::string_view server_config,
absl::string_view source_address_token,
const std::vector<std::string>& certs,
const std::string& cert_sct,
absl::string_view chlo_hash,
absl::string_view signature,
QuicWallTime now,
QuicWallTime expiration_time) {
QUICHE_DCHECK(server_config_.empty());
if (server_config.empty()) {
RecordDiskCacheServerConfigState(SERVER_CONFIG_EMPTY);
return false;
}
std::string error_details;
ServerConfigState state =
SetServerConfig(server_config, now, expiration_time, &error_details);
RecordDiskCacheServerConfigState(state);
if (state != SERVER_CONFIG_VALID) {
QUIC_DVLOG(1) << "SetServerConfig failed with " << error_details;
return false;
}
chlo_hash_.assign(chlo_hash.data(), chlo_hash.size());
server_config_sig_.assign(signature.data(), signature.size());
source_address_token_.assign(source_address_token.data(),
source_address_token.size());
certs_ = certs;
cert_sct_ = cert_sct;
return true;
}
const std::string& QuicCryptoClientConfig::CachedState::server_config() const {
return server_config_;
}
const std::string& QuicCryptoClientConfig::CachedState::source_address_token()
const {
return source_address_token_;
}
const std::vector<std::string>& QuicCryptoClientConfig::CachedState::certs()
const {
return certs_;
}
const std::string& QuicCryptoClientConfig::CachedState::cert_sct() const {
return cert_sct_;
}
const std::string& QuicCryptoClientConfig::CachedState::chlo_hash() const {
return chlo_hash_;
}
const std::string& QuicCryptoClientConfig::CachedState::signature() const {
return server_config_sig_;
}
bool QuicCryptoClientConfig::CachedState::proof_valid() const {
return server_config_valid_;
}
uint64_t QuicCryptoClientConfig::CachedState::generation_counter() const {
return generation_counter_;
}
const ProofVerifyDetails*
QuicCryptoClientConfig::CachedState::proof_verify_details() const {
return proof_verify_details_.get();
}
void QuicCryptoClientConfig::CachedState::set_source_address_token(
absl::string_view token) {
source_address_token_ = std::string(token);
}
void QuicCryptoClientConfig::CachedState::set_cert_sct(
absl::string_view cert_sct) {
cert_sct_ = std::string(cert_sct);
}
void QuicCryptoClientConfig::CachedState::SetProofVerifyDetails(
ProofVerifyDetails* details) {
proof_verify_details_.reset(details);
}
void QuicCryptoClientConfig::CachedState::InitializeFrom(
const QuicCryptoClientConfig::CachedState& other) {
QUICHE_DCHECK(server_config_.empty());
QUICHE_DCHECK(!server_config_valid_);
server_config_ = other.server_config_;
source_address_token_ = other.source_address_token_;
certs_ = other.certs_;
cert_sct_ = other.cert_sct_;
chlo_hash_ = other.chlo_hash_;
server_config_sig_ = other.server_config_sig_;
server_config_valid_ = other.server_config_valid_;
expiration_time_ = other.expiration_time_;
if (other.proof_verify_details_ != nullptr) {
proof_verify_details_.reset(other.proof_verify_details_->Clone());
}
++generation_counter_;
}
void QuicCryptoClientConfig::SetDefaults() {
// Key exchange methods.
kexs = {kC255, kP256};
// Authenticated encryption algorithms. Prefer AES-GCM if hardware-supported
// fast implementation is available.
if (EVP_has_aes_hardware() == 1) {
aead = {kAESG, kCC20};
} else {
aead = {kCC20, kAESG};
}
}
QuicCryptoClientConfig::CachedState* QuicCryptoClientConfig::LookupOrCreate(
const QuicServerId& server_id) {
auto it = cached_states_.find(server_id);
if (it != cached_states_.end()) {
return it->second.get();
}
CachedState* cached = new CachedState;
cached_states_.insert(std::make_pair(server_id, absl::WrapUnique(cached)));
bool cache_populated = PopulateFromCanonicalConfig(server_id, cached);
QUIC_CLIENT_HISTOGRAM_BOOL(
"QuicCryptoClientConfig.PopulatedFromCanonicalConfig", cache_populated,
"");
return cached;
}
void QuicCryptoClientConfig::ClearCachedStates(const ServerIdFilter& filter) {
for (auto it = cached_states_.begin(); it != cached_states_.end(); ++it) {
if (filter.Matches(it->first))
it->second->Clear();
}
}
void QuicCryptoClientConfig::FillInchoateClientHello(
const QuicServerId& server_id,
const ParsedQuicVersion preferred_version,
const CachedState* cached,
QuicRandom* rand,
bool demand_x509_proof,
QuicReferenceCountedPointer<QuicCryptoNegotiatedParameters> out_params,
CryptoHandshakeMessage* out) const {
out->set_tag(kCHLO);
out->set_minimum_size(1);
// Server name indication. We only send SNI if it's a valid domain name, as
// per the spec.
if (QuicHostnameUtils::IsValidSNI(server_id.host())) {
out->SetStringPiece(kSNI, server_id.host());
}
out->SetVersion(kVER, preferred_version);
if (!user_agent_id_.empty()) {
out->SetStringPiece(kUAID, user_agent_id_);
}
if (!alpn_.empty()) {
out->SetStringPiece(kALPN, alpn_);
}
// Even though this is an inchoate CHLO, send the SCID so that
// the STK can be validated by the server.
const CryptoHandshakeMessage* scfg = cached->GetServerConfig();
if (scfg != nullptr) {
absl::string_view scid;
if (scfg->GetStringPiece(kSCID, &scid)) {
out->SetStringPiece(kSCID, scid);
}
}
if (!cached->source_address_token().empty()) {
out->SetStringPiece(kSourceAddressTokenTag, cached->source_address_token());
}
if (!demand_x509_proof) {
return;
}
char proof_nonce[32];
rand->RandBytes(proof_nonce, ABSL_ARRAYSIZE(proof_nonce));
out->SetStringPiece(
kNONP, absl::string_view(proof_nonce, ABSL_ARRAYSIZE(proof_nonce)));
out->SetVector(kPDMD, QuicTagVector{kX509});
if (common_cert_sets) {
out->SetStringPiece(kCCS, common_cert_sets->GetCommonHashes());
}
out->SetStringPiece(kCertificateSCTTag, "");
const std::vector<std::string>& certs = cached->certs();
// We save |certs| in the QuicCryptoNegotiatedParameters so that, if the
// client config is being used for multiple connections, another connection
// doesn't update the cached certificates and cause us to be unable to
// process the server's compressed certificate chain.
out_params->cached_certs = certs;
if (!certs.empty()) {
std::vector<uint64_t> hashes;
hashes.reserve(certs.size());
for (auto i = certs.begin(); i != certs.end(); ++i) {
hashes.push_back(QuicUtils::FNV1a_64_Hash(*i));
}
out->SetVector(kCCRT, hashes);
}
}
QuicErrorCode QuicCryptoClientConfig::FillClientHello(
const QuicServerId& server_id,
QuicConnectionId connection_id,
const ParsedQuicVersion preferred_version,
const ParsedQuicVersion actual_version,
const CachedState* cached,
QuicWallTime now,
QuicRandom* rand,
QuicReferenceCountedPointer<QuicCryptoNegotiatedParameters> out_params,
CryptoHandshakeMessage* out,
std::string* error_details) const {
QUICHE_DCHECK(error_details != nullptr);
QUIC_BUG_IF(quic_bug_12943_2,
!QuicUtils::IsConnectionIdValidForVersion(
connection_id, preferred_version.transport_version))
<< "FillClientHello: attempted to use connection ID " << connection_id
<< " which is invalid with version " << preferred_version;
FillInchoateClientHello(server_id, preferred_version, cached, rand,
/* demand_x509_proof= */ true, out_params, out);
out->set_minimum_size(1);
const CryptoHandshakeMessage* scfg = cached->GetServerConfig();
if (!scfg) {
// This should never happen as our caller should have checked
// cached->IsComplete() before calling this function.
*error_details = "Handshake not ready";
return QUIC_CRYPTO_INTERNAL_ERROR;
}
absl::string_view scid;
if (!scfg->GetStringPiece(kSCID, &scid)) {
*error_details = "SCFG missing SCID";
return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER;
}
out->SetStringPiece(kSCID, scid);
out->SetStringPiece(kCertificateSCTTag, "");
QuicTagVector their_aeads;
QuicTagVector their_key_exchanges;
if (scfg->GetTaglist(kAEAD, &their_aeads) != QUIC_NO_ERROR ||
scfg->GetTaglist(kKEXS, &their_key_exchanges) != QUIC_NO_ERROR) {
*error_details = "Missing AEAD or KEXS";
return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER;
}
// AEAD: the work loads on the client and server are symmetric. Since the
// client is more likely to be CPU-constrained, break the tie by favoring
// the client's preference.
// Key exchange: the client does more work than the server, so favor the
// client's preference.
size_t key_exchange_index;
if (!FindMutualQuicTag(aead, their_aeads, &out_params->aead, nullptr) ||
!FindMutualQuicTag(kexs, their_key_exchanges, &out_params->key_exchange,
&key_exchange_index)) {
*error_details = "Unsupported AEAD or KEXS";
return QUIC_CRYPTO_NO_SUPPORT;
}
out->SetVector(kAEAD, QuicTagVector{out_params->aead});
out->SetVector(kKEXS, QuicTagVector{out_params->key_exchange});
absl::string_view public_value;
if (scfg->GetNthValue24(kPUBS, key_exchange_index, &public_value) !=
QUIC_NO_ERROR) {
*error_details = "Missing public value";
return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER;
}
absl::string_view orbit;
if (!scfg->GetStringPiece(kORBT, &orbit) || orbit.size() != kOrbitSize) {
*error_details = "SCFG missing OBIT";
return QUIC_CRYPTO_MESSAGE_PARAMETER_NOT_FOUND;
}
CryptoUtils::GenerateNonce(now, rand, orbit, &out_params->client_nonce);
out->SetStringPiece(kNONC, out_params->client_nonce);
if (!out_params->server_nonce.empty()) {
out->SetStringPiece(kServerNonceTag, out_params->server_nonce);
}
switch (out_params->key_exchange) {
case kC255:
out_params->client_key_exchange = Curve25519KeyExchange::New(
Curve25519KeyExchange::NewPrivateKey(rand));
break;
case kP256:
out_params->client_key_exchange =
P256KeyExchange::New(P256KeyExchange::NewPrivateKey());
break;
default:
QUICHE_DCHECK(false);
*error_details = "Configured to support an unknown key exchange";
return QUIC_CRYPTO_INTERNAL_ERROR;
}
if (!out_params->client_key_exchange->CalculateSharedKeySync(
public_value, &out_params->initial_premaster_secret)) {
*error_details = "Key exchange failure";
return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER;
}
out->SetStringPiece(kPUBS, out_params->client_key_exchange->public_value());
const std::vector<std::string>& certs = cached->certs();
if (certs.empty()) {
*error_details = "No certs to calculate XLCT";
return QUIC_CRYPTO_INTERNAL_ERROR;
}
out->SetValue(kXLCT, CryptoUtils::ComputeLeafCertHash(certs[0]));
// Derive the symmetric keys and set up the encrypters and decrypters.
// Set the following members of out_params:
// out_params->hkdf_input_suffix
// out_params->initial_crypters
out_params->hkdf_input_suffix.clear();
out_params->hkdf_input_suffix.append(connection_id.data(),
connection_id.length());
const QuicData& client_hello_serialized = out->GetSerialized();
out_params->hkdf_input_suffix.append(client_hello_serialized.data(),
client_hello_serialized.length());
out_params->hkdf_input_suffix.append(cached->server_config());
if (certs.empty()) {
*error_details = "No certs found to include in KDF";
return QUIC_CRYPTO_INTERNAL_ERROR;
}
out_params->hkdf_input_suffix.append(certs[0]);
std::string hkdf_input;
const size_t label_len = strlen(QuicCryptoConfig::kInitialLabel) + 1;
hkdf_input.reserve(label_len + out_params->hkdf_input_suffix.size());
hkdf_input.append(QuicCryptoConfig::kInitialLabel, label_len);
hkdf_input.append(out_params->hkdf_input_suffix);
std::string* subkey_secret = &out_params->initial_subkey_secret;
if (!CryptoUtils::DeriveKeys(
actual_version, out_params->initial_premaster_secret,
out_params->aead, out_params->client_nonce, out_params->server_nonce,
pre_shared_key_, hkdf_input, Perspective::IS_CLIENT,
CryptoUtils::Diversification::Pending(),
&out_params->initial_crypters, subkey_secret)) {
*error_details = "Symmetric key setup failed";
return QUIC_CRYPTO_SYMMETRIC_KEY_SETUP_FAILED;
}
return QUIC_NO_ERROR;
}
QuicErrorCode QuicCryptoClientConfig::CacheNewServerConfig(
const CryptoHandshakeMessage& message,
QuicWallTime now,
QuicTransportVersion /*version*/,
absl::string_view chlo_hash,
const std::vector<std::string>& cached_certs,
CachedState* cached,
std::string* error_details) {
QUICHE_DCHECK(error_details != nullptr);
absl::string_view scfg;
if (!message.GetStringPiece(kSCFG, &scfg)) {
*error_details = "Missing SCFG";
return QUIC_CRYPTO_MESSAGE_PARAMETER_NOT_FOUND;
}
QuicWallTime expiration_time = QuicWallTime::Zero();
uint64_t expiry_seconds;
if (message.GetUint64(kSTTL, &expiry_seconds) == QUIC_NO_ERROR) {
// Only cache configs for a maximum of 1 week.
expiration_time = now.Add(QuicTime::Delta::FromSeconds(
std::min(expiry_seconds, kNumSecondsPerWeek)));
}
CachedState::ServerConfigState state =
cached->SetServerConfig(scfg, now, expiration_time, error_details);
if (state == CachedState::SERVER_CONFIG_EXPIRED) {
return QUIC_CRYPTO_SERVER_CONFIG_EXPIRED;
}
// TODO(rtenneti): Return more specific error code than returning
// QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER.
if (state != CachedState::SERVER_CONFIG_VALID) {
return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER;
}
absl::string_view token;
if (message.GetStringPiece(kSourceAddressTokenTag, &token)) {
cached->set_source_address_token(token);
}
absl::string_view proof, cert_bytes, cert_sct;
bool has_proof = message.GetStringPiece(kPROF, &proof);
bool has_cert = message.GetStringPiece(kCertificateTag, &cert_bytes);
if (has_proof && has_cert) {
std::vector<std::string> certs;
if (!CertCompressor::DecompressChain(cert_bytes, cached_certs,
common_cert_sets, &certs)) {
*error_details = "Certificate data invalid";
return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER;
}
message.GetStringPiece(kCertificateSCTTag, &cert_sct);
cached->SetProof(certs, cert_sct, chlo_hash, proof);
} else {
// Secure QUIC: clear existing proof as we have been sent a new SCFG
// without matching proof/certs.
cached->ClearProof();
if (has_proof && !has_cert) {
*error_details = "Certificate missing";
return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER;
}
if (!has_proof && has_cert) {
*error_details = "Proof missing";
return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER;
}
}
return QUIC_NO_ERROR;
}
QuicErrorCode QuicCryptoClientConfig::ProcessRejection(
const CryptoHandshakeMessage& rej,
QuicWallTime now,
const QuicTransportVersion version,
absl::string_view chlo_hash,
CachedState* cached,
QuicReferenceCountedPointer<QuicCryptoNegotiatedParameters> out_params,
std::string* error_details) {
QUICHE_DCHECK(error_details != nullptr);
if (rej.tag() != kREJ) {
*error_details = "Message is not REJ";
return QUIC_CRYPTO_INTERNAL_ERROR;
}
QuicErrorCode error =
CacheNewServerConfig(rej, now, version, chlo_hash,
out_params->cached_certs, cached, error_details);
if (error != QUIC_NO_ERROR) {
return error;
}
absl::string_view nonce;
if (rej.GetStringPiece(kServerNonceTag, &nonce)) {
out_params->server_nonce = std::string(nonce);
}
return QUIC_NO_ERROR;
}
QuicErrorCode QuicCryptoClientConfig::ProcessServerHello(
const CryptoHandshakeMessage& server_hello,
QuicConnectionId /*connection_id*/,
ParsedQuicVersion version,
const ParsedQuicVersionVector& negotiated_versions,
CachedState* cached,
QuicReferenceCountedPointer<QuicCryptoNegotiatedParameters> out_params,
std::string* error_details) {
QUICHE_DCHECK(error_details != nullptr);
QuicErrorCode valid = CryptoUtils::ValidateServerHello(
server_hello, negotiated_versions, error_details);
if (valid != QUIC_NO_ERROR) {
return valid;
}
// Learn about updated source address tokens.
absl::string_view token;
if (server_hello.GetStringPiece(kSourceAddressTokenTag, &token)) {
cached->set_source_address_token(token);
}
absl::string_view shlo_nonce;
if (!server_hello.GetStringPiece(kServerNonceTag, &shlo_nonce)) {
*error_details = "server hello missing server nonce";
return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER;
}
// TODO(agl):
// learn about updated SCFGs.
absl::string_view public_value;
if (!server_hello.GetStringPiece(kPUBS, &public_value)) {
*error_details = "server hello missing forward secure public value";
return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER;
}
if (!out_params->client_key_exchange->CalculateSharedKeySync(
public_value, &out_params->forward_secure_premaster_secret)) {
*error_details = "Key exchange failure";
return QUIC_INVALID_CRYPTO_MESSAGE_PARAMETER;
}
std::string hkdf_input;
const size_t label_len = strlen(QuicCryptoConfig::kForwardSecureLabel) + 1;
hkdf_input.reserve(label_len + out_params->hkdf_input_suffix.size());
hkdf_input.append(QuicCryptoConfig::kForwardSecureLabel, label_len);
hkdf_input.append(out_params->hkdf_input_suffix);
if (!CryptoUtils::DeriveKeys(
version, out_params->forward_secure_premaster_secret,
out_params->aead, out_params->client_nonce,
shlo_nonce.empty() ? out_params->server_nonce : shlo_nonce,
pre_shared_key_, hkdf_input, Perspective::IS_CLIENT,
CryptoUtils::Diversification::Never(),
&out_params->forward_secure_crypters, &out_params->subkey_secret)) {
*error_details = "Symmetric key setup failed";
return QUIC_CRYPTO_SYMMETRIC_KEY_SETUP_FAILED;
}
return QUIC_NO_ERROR;
}
QuicErrorCode QuicCryptoClientConfig::ProcessServerConfigUpdate(
const CryptoHandshakeMessage& server_config_update,
QuicWallTime now,
const QuicTransportVersion version,
absl::string_view chlo_hash,
CachedState* cached,
QuicReferenceCountedPointer<QuicCryptoNegotiatedParameters> out_params,
std::string* error_details) {
QUICHE_DCHECK(error_details != nullptr);
if (server_config_update.tag() != kSCUP) {
*error_details = "ServerConfigUpdate must have kSCUP tag.";
return QUIC_INVALID_CRYPTO_MESSAGE_TYPE;
}
return CacheNewServerConfig(server_config_update, now, version, chlo_hash,
out_params->cached_certs, cached, error_details);
}
ProofVerifier* QuicCryptoClientConfig::proof_verifier() const {
return proof_verifier_.get();
}
SessionCache* QuicCryptoClientConfig::session_cache() const {
return session_cache_.get();
}
ProofSource* QuicCryptoClientConfig::proof_source() const {
return proof_source_.get();
}
void QuicCryptoClientConfig::set_proof_source(
std::unique_ptr<ProofSource> proof_source) {
proof_source_ = std::move(proof_source);
}
SSL_CTX* QuicCryptoClientConfig::ssl_ctx() const {
return ssl_ctx_.get();
}
void QuicCryptoClientConfig::InitializeFrom(
const QuicServerId& server_id,
const QuicServerId& canonical_server_id,
QuicCryptoClientConfig* canonical_crypto_config) {
CachedState* canonical_cached =
canonical_crypto_config->LookupOrCreate(canonical_server_id);
if (!canonical_cached->proof_valid()) {
return;
}
CachedState* cached = LookupOrCreate(server_id);
cached->InitializeFrom(*canonical_cached);
}
void QuicCryptoClientConfig::AddCanonicalSuffix(const std::string& suffix) {
canonical_suffixes_.push_back(suffix);
}
bool QuicCryptoClientConfig::PopulateFromCanonicalConfig(
const QuicServerId& server_id,
CachedState* server_state) {
QUICHE_DCHECK(server_state->IsEmpty());
size_t i = 0;
for (; i < canonical_suffixes_.size(); ++i) {
if (absl::EndsWithIgnoreCase(server_id.host(), canonical_suffixes_[i])) {
break;
}
}
if (i == canonical_suffixes_.size()) {
return false;
}
QuicServerId suffix_server_id(canonical_suffixes_[i], server_id.port(),
server_id.privacy_mode_enabled());
auto it = canonical_server_map_.lower_bound(suffix_server_id);
if (it == canonical_server_map_.end() || it->first != suffix_server_id) {
// This is the first host we've seen which matches the suffix, so make it
// canonical. Use |it| as position hint for faster insertion.
canonical_server_map_.insert(
it, std::make_pair(std::move(suffix_server_id), std::move(server_id)));
return false;
}
const QuicServerId& canonical_server_id = it->second;
CachedState* canonical_state = cached_states_[canonical_server_id].get();
if (!canonical_state->proof_valid()) {
return false;
}
// Update canonical version to point at the "most recent" entry.
it->second = server_id;
server_state->InitializeFrom(*canonical_state);
return true;
}
} // namespace quic