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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/peerconnection/rtc_dtls_transport.h"
#include <memory>
#include "base/compiler_specific.h"
#include "base/task/single_thread_task_runner.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/web/web_local_frame.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_rtc_dtls_transport_state.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/events/event.h"
#include "third_party/blink/renderer/core/frame/deprecation/deprecation.h"
#include "third_party/blink/renderer/core/frame/local_dom_window.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/typed_arrays/dom_array_buffer.h"
#include "third_party/blink/renderer/modules/peerconnection/adapters/dtls_transport_proxy.h"
#include "third_party/blink/renderer/modules/peerconnection/peer_connection_dependency_factory.h"
#include "third_party/blink/renderer/modules/peerconnection/rtc_error_util.h"
#include "third_party/blink/renderer/modules/peerconnection/rtc_ice_transport.h"
#include "third_party/blink/renderer/platform/scheduler/public/thread.h"
#include "third_party/boringssl/src/include/openssl/ssl.h"
#include "third_party/webrtc/api/dtls_transport_interface.h"
#include "third_party/webrtc/api/peer_connection_interface.h"
namespace blink {
namespace {
V8RTCDtlsTransportState::Enum TransportStateToEnum(
webrtc::DtlsTransportState state) {
switch (state) {
case webrtc::DtlsTransportState::kNew:
return V8RTCDtlsTransportState::Enum::kNew;
case webrtc::DtlsTransportState::kConnecting:
return V8RTCDtlsTransportState::Enum::kConnecting;
case webrtc::DtlsTransportState::kConnected:
return V8RTCDtlsTransportState::Enum::kConnected;
case webrtc::DtlsTransportState::kClosed:
return V8RTCDtlsTransportState::Enum::kClosed;
case webrtc::DtlsTransportState::kFailed:
return V8RTCDtlsTransportState::Enum::kFailed;
case webrtc::DtlsTransportState::kNumValues:
// Should not happen.
break;
}
NOTREACHED();
}
std::unique_ptr<DtlsTransportProxy> CreateProxy(
ExecutionContext* context,
webrtc::DtlsTransportInterface* native_transport,
DtlsTransportProxy::Delegate* delegate) {
LocalFrame* frame = To<LocalDOMWindow>(context)->GetFrame();
scoped_refptr<base::SingleThreadTaskRunner> proxy_thread =
frame->GetTaskRunner(TaskType::kNetworking);
scoped_refptr<base::SingleThreadTaskRunner> host_thread =
PeerConnectionDependencyFactory::From(*context)
.GetWebRtcNetworkTaskRunner();
return DtlsTransportProxy::Create(*frame, proxy_thread, host_thread,
native_transport, delegate);
}
} // namespace
RTCDtlsTransport::RTCDtlsTransport(
ExecutionContext* context,
webrtc::scoped_refptr<webrtc::DtlsTransportInterface> native_transport,
RTCIceTransport* ice_transport)
: ExecutionContextClient(context),
current_state_(webrtc::DtlsTransportState::kNew),
native_transport_(native_transport),
proxy_(CreateProxy(context, native_transport.get(), this)),
ice_transport_(ice_transport) {}
RTCDtlsTransport::~RTCDtlsTransport() {}
V8RTCDtlsTransportState RTCDtlsTransport::state() const {
if (closed_from_owner_) {
return V8RTCDtlsTransportState(V8RTCDtlsTransportState::Enum::kClosed);
}
return V8RTCDtlsTransportState(TransportStateToEnum(current_state_.state()));
}
const HeapVector<Member<DOMArrayBuffer>>&
RTCDtlsTransport::getRemoteCertificates() const {
return remote_certificates_;
}
RTCIceTransport* RTCDtlsTransport::iceTransport() const {
return ice_transport_.Get();
}
webrtc::DtlsTransportInterface* RTCDtlsTransport::native_transport() {
return native_transport_.get();
}
void RTCDtlsTransport::ChangeState(webrtc::DtlsTransportInformation info) {
DCHECK(info.state() == webrtc::DtlsTransportState::kClosed ||
current_state_.state() != webrtc::DtlsTransportState::kClosed);
current_state_ = info;
}
void RTCDtlsTransport::Close() {
closed_from_owner_ = true;
if (current_state_.state() != webrtc::DtlsTransportState::kClosed) {
DispatchEvent(*Event::Create(event_type_names::kStatechange));
}
ice_transport_->Stop();
}
// Implementation of DtlsTransportProxy::Delegate
void RTCDtlsTransport::OnStartCompleted(webrtc::DtlsTransportInformation info) {
current_state_ = info;
}
void RTCDtlsTransport::OnStateChange(webrtc::DtlsTransportInformation info) {
// We depend on closed only happening once for safe garbage collection.
DCHECK(current_state_.state() != webrtc::DtlsTransportState::kClosed);
current_state_ = info;
// DTLS 1.0 is deprecated, emit a console warning.
if (current_state_.state() == webrtc::DtlsTransportState::kConnected) {
if (current_state_.tls_version()) {
if (*current_state_.tls_version() == DTLS1_VERSION ||
*current_state_.tls_version() == SSL3_VERSION ||
*current_state_.tls_version() == TLS1_VERSION ||
*current_state_.tls_version() == TLS1_1_VERSION) {
Deprecation::CountDeprecation(GetExecutionContext(),
WebFeature::kObsoleteWebrtcTlsVersion);
}
}
}
// If the certificates have changed, copy them as DOMArrayBuffers.
// This makes sure that getRemoteCertificates() == getRemoteCertificates()
if (current_state_.remote_ssl_certificates()) {
const webrtc::SSLCertChain* certs =
current_state_.remote_ssl_certificates();
if (certs->GetSize() != remote_certificates_.size()) {
remote_certificates_.clear();
for (size_t i = 0; i < certs->GetSize(); i++) {
auto& cert = certs->Get(i);
webrtc::Buffer der_cert;
cert.ToDER(&der_cert);
DOMArrayBuffer* dab_cert = DOMArrayBuffer::Create(der_cert);
remote_certificates_.push_back(dab_cert);
}
} else {
// Replace certificates that have changed, if any
for (WTF::wtf_size_t i = 0; i < certs->GetSize(); i++) {
auto& cert = certs->Get(i);
webrtc::Buffer der_cert;
cert.ToDER(&der_cert);
DOMArrayBuffer* dab_cert = DOMArrayBuffer::Create(der_cert);
// Don't replace the certificate if it's unchanged.
// Should have been "if (*dab_cert != *remote_certificates_[i])"
if (dab_cert->ByteLength() != remote_certificates_[i]->ByteLength() ||
UNSAFE_TODO(memcmp(dab_cert->Data(),
remote_certificates_[i]->Data(),
dab_cert->ByteLength())) != 0) {
remote_certificates_[i] = dab_cert;
}
}
}
} else {
remote_certificates_.clear();
}
if (!closed_from_owner_) {
DispatchEvent(*Event::Create(event_type_names::kStatechange));
}
}
const AtomicString& RTCDtlsTransport::InterfaceName() const {
return event_target_names::kRTCDtlsTransport;
}
ExecutionContext* RTCDtlsTransport::GetExecutionContext() const {
return ExecutionContextClient::GetExecutionContext();
}
void RTCDtlsTransport::Trace(Visitor* visitor) const {
visitor->Trace(remote_certificates_);
visitor->Trace(ice_transport_);
DtlsTransportProxy::Delegate::Trace(visitor);
EventTarget::Trace(visitor);
ExecutionContextClient::Trace(visitor);
}
} // namespace blink
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