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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/quic/quic_crypto_server_stream.h"
#include "base/base64.h"
#include "crypto/secure_hash.h"
#include "net/quic/crypto/crypto_protocol.h"
#include "net/quic/crypto/crypto_utils.h"
#include "net/quic/crypto/quic_crypto_server_config.h"
#include "net/quic/quic_config.h"
#include "net/quic/quic_protocol.h"
#include "net/quic/quic_session.h"
namespace net {
QuicCryptoServerStream::QuicCryptoServerStream(
const QuicCryptoServerConfig& crypto_config,
QuicSession* session)
: QuicCryptoStream(session),
crypto_config_(crypto_config),
validate_client_hello_cb_(NULL) {
}
QuicCryptoServerStream::~QuicCryptoServerStream() {
// Detach from the validation callback.
if (validate_client_hello_cb_ != NULL) {
validate_client_hello_cb_->Cancel();
}
}
void QuicCryptoServerStream::OnHandshakeMessage(
const CryptoHandshakeMessage& message) {
QuicCryptoStream::OnHandshakeMessage(message);
// Do not process handshake messages after the handshake is confirmed.
if (handshake_confirmed_) {
CloseConnection(QUIC_CRYPTO_MESSAGE_AFTER_HANDSHAKE_COMPLETE);
return;
}
if (message.tag() != kCHLO) {
CloseConnection(QUIC_INVALID_CRYPTO_MESSAGE_TYPE);
return;
}
if (validate_client_hello_cb_ != NULL) {
// 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.
CloseConnection(QUIC_CRYPTO_MESSAGE_WHILE_VALIDATING_CLIENT_HELLO);
return;
}
validate_client_hello_cb_ = new ValidateCallback(this);
return crypto_config_.ValidateClientHello(
message,
session()->connection()->peer_address(),
session()->connection()->clock(),
validate_client_hello_cb_);
}
void QuicCryptoServerStream::FinishProcessingHandshakeMessage(
const CryptoHandshakeMessage& message,
const ValidateClientHelloResultCallback::Result& result) {
// Clear the callback that got us here.
DCHECK(validate_client_hello_cb_ != NULL);
validate_client_hello_cb_ = NULL;
string error_details;
CryptoHandshakeMessage reply;
QuicErrorCode error = ProcessClientHello(
message, result, &reply, &error_details);
if (error != QUIC_NO_ERROR) {
CloseConnectionWithDetails(error, error_details);
return;
}
if (reply.tag() != kSHLO) {
SendHandshakeMessage(reply);
return;
}
// If we are returning a SHLO then we accepted the handshake.
QuicConfig* config = session()->config();
error = config->ProcessClientHello(message, &error_details);
if (error != QUIC_NO_ERROR) {
CloseConnectionWithDetails(error, error_details);
return;
}
session()->OnConfigNegotiated();
config->ToHandshakeMessage(&reply);
// 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.
session()->connection()->SetEncrypter(
ENCRYPTION_INITIAL,
crypto_negotiated_params_.initial_crypters.encrypter.release());
session()->connection()->SetDefaultEncryptionLevel(
ENCRYPTION_INITIAL);
// Set the decrypter immediately so that we no longer accept unencrypted
// packets.
session()->connection()->SetDecrypter(
crypto_negotiated_params_.initial_crypters.decrypter.release());
SendHandshakeMessage(reply);
session()->connection()->SetEncrypter(
ENCRYPTION_FORWARD_SECURE,
crypto_negotiated_params_.forward_secure_crypters.encrypter.release());
session()->connection()->SetDefaultEncryptionLevel(
ENCRYPTION_FORWARD_SECURE);
session()->connection()->SetAlternativeDecrypter(
crypto_negotiated_params_.forward_secure_crypters.decrypter.release(),
false /* don't latch */);
encryption_established_ = true;
handshake_confirmed_ = true;
session()->OnCryptoHandshakeEvent(QuicSession::HANDSHAKE_CONFIRMED);
}
bool QuicCryptoServerStream::GetBase64SHA256ClientChannelID(
string* output) const {
if (!encryption_established_ ||
crypto_negotiated_params_.channel_id.empty()) {
return false;
}
const string& channel_id(crypto_negotiated_params_.channel_id);
scoped_ptr<crypto::SecureHash> hash(
crypto::SecureHash::Create(crypto::SecureHash::SHA256));
hash->Update(channel_id.data(), channel_id.size());
uint8 digest[32];
hash->Finish(digest, sizeof(digest));
base::Base64Encode(string(
reinterpret_cast<const char*>(digest), sizeof(digest)), output);
// Remove padding.
size_t len = output->size();
if (len >= 2) {
if ((*output)[len - 1] == '=') {
len--;
if ((*output)[len - 1] == '=') {
len--;
}
output->resize(len);
}
}
return true;
}
QuicErrorCode QuicCryptoServerStream::ProcessClientHello(
const CryptoHandshakeMessage& message,
const ValidateClientHelloResultCallback::Result& result,
CryptoHandshakeMessage* reply,
string* error_details) {
return crypto_config_.ProcessClientHello(
result,
session()->connection()->guid(),
session()->connection()->peer_address(),
session()->connection()->version(),
session()->connection()->supported_versions(),
session()->connection()->clock(),
session()->connection()->random_generator(),
&crypto_negotiated_params_, reply, error_details);
}
QuicCryptoServerStream::ValidateCallback::ValidateCallback(
QuicCryptoServerStream* parent) : parent_(parent) {
}
void QuicCryptoServerStream::ValidateCallback::Cancel() {
parent_ = NULL;
}
void QuicCryptoServerStream::ValidateCallback::RunImpl(
const CryptoHandshakeMessage& client_hello,
const Result& result) {
if (parent_ != NULL) {
parent_->FinishProcessingHandshakeMessage(client_hello, result);
}
}
} // namespace net
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