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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/socket/ssl_client_socket.h"
#include "base/metrics/histogram_macros.h"
#include "base/metrics/sparse_histogram.h"
#include "base/strings/string_util.h"
#include "crypto/ec_private_key.h"
#include "net/base/connection_type_histograms.h"
#include "net/base/net_errors.h"
#include "net/ssl/channel_id_service.h"
#include "net/ssl/ssl_cipher_suite_names.h"
#include "net/ssl/ssl_config_service.h"
#include "net/ssl/ssl_connection_status_flags.h"
namespace net {
SSLClientSocket::SSLClientSocket()
: signed_cert_timestamps_received_(false),
stapled_ocsp_response_received_(false),
negotiation_extension_(kExtensionUnknown) {
}
// static
NextProto SSLClientSocket::NextProtoFromString(
const std::string& proto_string) {
if (proto_string == "http1.1" || proto_string == "http/1.1") {
return kProtoHTTP11;
} else if (proto_string == "spdy/2") {
return kProtoDeprecatedSPDY2;
} else if (proto_string == "spdy/3") {
return kProtoSPDY3;
} else if (proto_string == "spdy/3.1") {
return kProtoSPDY31;
} else if (proto_string == "h2") {
return kProtoHTTP2;
} else if (proto_string == "quic/1+spdy/3") {
return kProtoQUIC1SPDY3;
} else {
return kProtoUnknown;
}
}
// static
const char* SSLClientSocket::NextProtoToString(NextProto next_proto) {
switch (next_proto) {
case kProtoHTTP11:
return "http/1.1";
case kProtoDeprecatedSPDY2:
return "spdy/2";
case kProtoSPDY3:
return "spdy/3";
case kProtoSPDY31:
return "spdy/3.1";
case kProtoHTTP2:
return "h2";
case kProtoQUIC1SPDY3:
return "quic/1+spdy/3";
case kProtoUnknown:
break;
}
return "unknown";
}
// static
const char* SSLClientSocket::NextProtoStatusToString(
const SSLClientSocket::NextProtoStatus status) {
switch (status) {
case kNextProtoUnsupported:
return "unsupported";
case kNextProtoNegotiated:
return "negotiated";
case kNextProtoNoOverlap:
return "no-overlap";
}
return NULL;
}
bool SSLClientSocket::WasNpnNegotiated() const {
std::string unused_proto;
return GetNextProto(&unused_proto) == kNextProtoNegotiated;
}
NextProto SSLClientSocket::GetNegotiatedProtocol() const {
std::string proto;
if (GetNextProto(&proto) != kNextProtoNegotiated)
return kProtoUnknown;
return NextProtoFromString(proto);
}
bool SSLClientSocket::IgnoreCertError(int error, int load_flags) {
if (error == OK)
return true;
return (load_flags & LOAD_IGNORE_ALL_CERT_ERRORS) &&
IsCertificateError(error);
}
void SSLClientSocket::RecordNegotiationExtension() {
if (negotiation_extension_ == kExtensionUnknown)
return;
std::string proto;
SSLClientSocket::NextProtoStatus status = GetNextProto(&proto);
if (status == kNextProtoUnsupported)
return;
// Convert protocol into numerical value for histogram.
NextProto protocol_negotiated = SSLClientSocket::NextProtoFromString(proto);
base::HistogramBase::Sample sample =
static_cast<base::HistogramBase::Sample>(protocol_negotiated);
// In addition to the protocol negotiated, we want to record which TLS
// extension was used, and in case of NPN, whether there was overlap between
// server and client list of supported protocols.
if (negotiation_extension_ == kExtensionNPN) {
if (status == kNextProtoNoOverlap) {
sample += 1000;
} else {
sample += 500;
}
} else {
DCHECK_EQ(kExtensionALPN, negotiation_extension_);
}
UMA_HISTOGRAM_SPARSE_SLOWLY("Net.SSLProtocolNegotiation", sample);
}
// static
void SSLClientSocket::RecordChannelIDSupport(
ChannelIDService* channel_id_service,
bool negotiated_channel_id,
bool channel_id_enabled,
bool supports_ecc) {
// Since this enum is used for a histogram, do not change or re-use values.
enum {
DISABLED = 0,
CLIENT_ONLY = 1,
CLIENT_AND_SERVER = 2,
CLIENT_NO_ECC = 3,
// CLIENT_BAD_SYSTEM_TIME is unused now.
CLIENT_BAD_SYSTEM_TIME = 4,
CLIENT_NO_CHANNEL_ID_SERVICE = 5,
CHANNEL_ID_USAGE_MAX
} supported = DISABLED;
if (negotiated_channel_id) {
supported = CLIENT_AND_SERVER;
} else if (channel_id_enabled) {
if (!channel_id_service)
supported = CLIENT_NO_CHANNEL_ID_SERVICE;
else if (!supports_ecc)
supported = CLIENT_NO_ECC;
else
supported = CLIENT_ONLY;
}
UMA_HISTOGRAM_ENUMERATION("DomainBoundCerts.Support", supported,
CHANNEL_ID_USAGE_MAX);
}
// static
bool SSLClientSocket::IsChannelIDEnabled(
const SSLConfig& ssl_config,
ChannelIDService* channel_id_service) {
if (!ssl_config.channel_id_enabled)
return false;
if (!channel_id_service) {
DVLOG(1) << "NULL channel_id_service_, not enabling channel ID.";
return false;
}
if (!crypto::ECPrivateKey::IsSupported()) {
DVLOG(1) << "Elliptic Curve not supported, not enabling channel ID.";
return false;
}
return true;
}
// static
bool SSLClientSocket::HasCipherAdequateForHTTP2(
const std::vector<uint16>& cipher_suites) {
for (uint16 cipher : cipher_suites) {
if (IsSecureTLSCipherSuite(cipher))
return true;
}
return false;
}
// static
bool SSLClientSocket::IsTLSVersionAdequateForHTTP2(
const SSLConfig& ssl_config) {
return ssl_config.version_max >= SSL_PROTOCOL_VERSION_TLS1_2;
}
// static
std::vector<uint8_t> SSLClientSocket::SerializeNextProtos(
const NextProtoVector& next_protos,
bool can_advertise_http2) {
std::vector<uint8_t> wire_protos;
for (const NextProto next_proto : next_protos) {
if (!can_advertise_http2 && next_proto == kProtoHTTP2) {
continue;
}
const std::string proto = NextProtoToString(next_proto);
if (proto.size() > 255) {
LOG(WARNING) << "Ignoring overlong NPN/ALPN protocol: " << proto;
continue;
}
if (proto.size() == 0) {
LOG(WARNING) << "Ignoring empty NPN/ALPN protocol";
continue;
}
wire_protos.push_back(proto.size());
for (const char ch : proto) {
wire_protos.push_back(static_cast<uint8_t>(ch));
}
}
return wire_protos;
}
} // namespace net
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