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/*
* Copyright 2024 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <memory>
#include <optional>
#include "absl/strings/str_cat.h"
#include "api/crypto/crypto_options.h"
#include "api/dtls_transport_interface.h"
#include "api/field_trials.h"
#include "api/scoped_refptr.h"
#include "api/test/rtc_error_matchers.h"
#include "api/units/time_delta.h"
#include "call/rtp_demuxer.h"
#include "media/base/fake_rtp.h"
#include "p2p/base/transport_description.h"
#include "p2p/dtls/dtls_transport.h"
#include "p2p/dtls/dtls_transport_internal.h"
#include "p2p/test/fake_ice_transport.h"
#include "pc/dtls_srtp_transport.h"
#include "pc/srtp_transport.h"
#include "pc/test/rtp_transport_test_util.h"
#include "rtc_base/async_packet_socket.h"
#include "rtc_base/buffer.h"
#include "rtc_base/copy_on_write_buffer.h"
#include "rtc_base/fake_clock.h"
#include "rtc_base/rtc_certificate.h"
#include "rtc_base/ssl_fingerprint.h"
#include "rtc_base/ssl_identity.h"
#include "rtc_base/ssl_stream_adapter.h"
#include "rtc_base/thread.h"
#include "test/create_test_field_trials.h"
#include "test/gmock.h"
#include "test/gtest.h"
#include "test/wait_until.h"
const int kRtpAuthTagLen = 10;
static const int kTimeout = 10000;
/* A test using a DTLS-SRTP transport on one side and
* SrtpTransport+DtlsTransport on the other side, connected by a
* FakeIceTransport.
*/
class DtlsSrtpTransportIntegrationTest : public ::testing::Test {
protected:
DtlsSrtpTransportIntegrationTest()
: client_ice_transport_(MakeIceTransport(webrtc::ICEROLE_CONTROLLING)),
server_ice_transport_(MakeIceTransport(webrtc::ICEROLE_CONTROLLED)),
client_dtls_transport_(MakeDtlsTransport(client_ice_transport_.get())),
server_dtls_transport_(MakeDtlsTransport(server_ice_transport_.get())),
client_certificate_(MakeCertificate()),
server_certificate_(MakeCertificate()),
dtls_srtp_transport_(false, field_trials_),
srtp_transport_(false, field_trials_) {
dtls_srtp_transport_.SetDtlsTransports(server_dtls_transport_.get(),
nullptr);
srtp_transport_.SetRtpPacketTransport(client_ice_transport_.get());
webrtc::RtpDemuxerCriteria demuxer_criteria;
demuxer_criteria.payload_types() = {0x00};
dtls_srtp_transport_.RegisterRtpDemuxerSink(demuxer_criteria,
&dtls_srtp_transport_observer_);
srtp_transport_.RegisterRtpDemuxerSink(demuxer_criteria,
&srtp_transport_observer_);
}
~DtlsSrtpTransportIntegrationTest() override {
dtls_srtp_transport_.UnregisterRtpDemuxerSink(
&dtls_srtp_transport_observer_);
srtp_transport_.UnregisterRtpDemuxerSink(&srtp_transport_observer_);
}
webrtc::scoped_refptr<webrtc::RTCCertificate> MakeCertificate() {
return webrtc::RTCCertificate::Create(
webrtc::SSLIdentity::Create("test", webrtc::KT_DEFAULT));
}
std::unique_ptr<webrtc::FakeIceTransport> MakeIceTransport(
webrtc::IceRole role) {
auto ice_transport = std::make_unique<webrtc::FakeIceTransport>(
"fake_" + absl::StrCat(static_cast<int>(role)), 0);
ice_transport->SetAsync(true);
ice_transport->SetAsyncDelay(0);
ice_transport->SetIceRole(role);
return ice_transport;
}
std::unique_ptr<webrtc::DtlsTransportInternalImpl> MakeDtlsTransport(
webrtc::FakeIceTransport* ice_transport) {
return std::make_unique<webrtc::DtlsTransportInternalImpl>(
ice_transport, webrtc::CryptoOptions(),
/*event_log=*/nullptr, webrtc::SSL_PROTOCOL_DTLS_12);
}
void SetRemoteFingerprintFromCert(
webrtc::DtlsTransportInternalImpl* transport,
const webrtc::scoped_refptr<webrtc::RTCCertificate>& cert) {
std::unique_ptr<webrtc::SSLFingerprint> fingerprint =
webrtc::SSLFingerprint::CreateFromCertificate(*cert);
transport->SetRemoteParameters(
fingerprint->algorithm,
reinterpret_cast<const uint8_t*>(fingerprint->digest.data()),
fingerprint->digest.size(), std::nullopt);
}
void Connect() {
client_dtls_transport_->SetLocalCertificate(client_certificate_);
client_dtls_transport_->SetDtlsRole(webrtc::SSL_SERVER);
server_dtls_transport_->SetLocalCertificate(server_certificate_);
server_dtls_transport_->SetDtlsRole(webrtc::SSL_CLIENT);
SetRemoteFingerprintFromCert(server_dtls_transport_.get(),
client_certificate_);
SetRemoteFingerprintFromCert(client_dtls_transport_.get(),
server_certificate_);
// Wire up the ICE and transport.
client_ice_transport_->SetDestination(server_ice_transport_.get());
// Wait for the DTLS connection to be up.
EXPECT_THAT(webrtc::WaitUntil(
[&] {
return client_dtls_transport_->writable() &&
server_dtls_transport_->writable();
},
::testing::IsTrue(),
{.timeout = webrtc::TimeDelta::Millis(kTimeout),
.clock = &fake_clock_}),
webrtc::IsRtcOk());
EXPECT_EQ(client_dtls_transport_->dtls_state(),
webrtc::DtlsTransportState::kConnected);
EXPECT_EQ(server_dtls_transport_->dtls_state(),
webrtc::DtlsTransportState::kConnected);
}
void SetupClientKeysManually() {
// Setup the client-side SRTP transport with the keys from the server DTLS
// transport.
int selected_crypto_suite;
ASSERT_TRUE(
server_dtls_transport_->GetSrtpCryptoSuite(&selected_crypto_suite));
int key_len;
int salt_len;
ASSERT_TRUE(webrtc::GetSrtpKeyAndSaltLengths((selected_crypto_suite),
&key_len, &salt_len));
// Extract the keys. The order depends on the role!
webrtc::ZeroOnFreeBuffer<uint8_t> dtls_buffer(key_len * 2 + salt_len * 2);
ASSERT_TRUE(server_dtls_transport_->ExportSrtpKeyingMaterial(dtls_buffer));
webrtc::ZeroOnFreeBuffer<unsigned char> client_write_key(
&dtls_buffer[0], key_len, key_len + salt_len);
webrtc::ZeroOnFreeBuffer<unsigned char> server_write_key(
&dtls_buffer[key_len], key_len, key_len + salt_len);
client_write_key.AppendData(&dtls_buffer[key_len + key_len], salt_len);
server_write_key.AppendData(&dtls_buffer[key_len + key_len + salt_len],
salt_len);
EXPECT_TRUE(srtp_transport_.SetRtpParams(
selected_crypto_suite, server_write_key, {}, selected_crypto_suite,
client_write_key, {}));
}
webrtc::CopyOnWriteBuffer CreateRtpPacket() {
size_t rtp_len = sizeof(kPcmuFrame);
size_t packet_size = rtp_len + kRtpAuthTagLen;
webrtc::Buffer rtp_packet_buffer(packet_size);
char* rtp_packet_data = rtp_packet_buffer.data<char>();
memcpy(rtp_packet_data, kPcmuFrame, rtp_len);
return {rtp_packet_data, rtp_len, packet_size};
}
void SendRtpPacketFromSrtpToDtlsSrtp() {
webrtc::AsyncSocketPacketOptions options;
webrtc::CopyOnWriteBuffer packet = CreateRtpPacket();
EXPECT_TRUE(srtp_transport_.SendRtpPacket(&packet, options,
webrtc::PF_SRTP_BYPASS));
EXPECT_THAT(webrtc::WaitUntil(
[&] { return dtls_srtp_transport_observer_.rtp_count(); },
::testing::Eq(1),
{.timeout = webrtc::TimeDelta::Millis(kTimeout),
.clock = &fake_clock_}),
webrtc::IsRtcOk());
EXPECT_EQ(1, dtls_srtp_transport_observer_.rtp_count());
ASSERT_TRUE(dtls_srtp_transport_observer_.last_recv_rtp_packet().data());
EXPECT_EQ(
0,
std::memcmp(dtls_srtp_transport_observer_.last_recv_rtp_packet().data(),
kPcmuFrame, sizeof(kPcmuFrame)));
}
void SendRtpPacketFromDtlsSrtpToSrtp() {
webrtc::AsyncSocketPacketOptions options;
webrtc::CopyOnWriteBuffer packet = CreateRtpPacket();
EXPECT_TRUE(dtls_srtp_transport_.SendRtpPacket(&packet, options,
webrtc::PF_SRTP_BYPASS));
EXPECT_THAT(
webrtc::WaitUntil([&] { return srtp_transport_observer_.rtp_count(); },
::testing::Eq(1),
{.timeout = webrtc::TimeDelta::Millis(kTimeout),
.clock = &fake_clock_}),
webrtc::IsRtcOk());
EXPECT_EQ(1, srtp_transport_observer_.rtp_count());
ASSERT_TRUE(srtp_transport_observer_.last_recv_rtp_packet().data());
EXPECT_EQ(
0, std::memcmp(srtp_transport_observer_.last_recv_rtp_packet().data(),
kPcmuFrame, sizeof(kPcmuFrame)));
}
private:
webrtc::AutoThread main_thread_;
webrtc::ScopedFakeClock fake_clock_;
webrtc::FieldTrials field_trials_ = webrtc::CreateTestFieldTrials();
std::unique_ptr<webrtc::FakeIceTransport> client_ice_transport_;
std::unique_ptr<webrtc::FakeIceTransport> server_ice_transport_;
std::unique_ptr<webrtc::DtlsTransportInternalImpl> client_dtls_transport_;
std::unique_ptr<webrtc::DtlsTransportInternalImpl> server_dtls_transport_;
webrtc::scoped_refptr<webrtc::RTCCertificate> client_certificate_;
webrtc::scoped_refptr<webrtc::RTCCertificate> server_certificate_;
webrtc::DtlsSrtpTransport dtls_srtp_transport_;
webrtc::SrtpTransport srtp_transport_;
webrtc::TransportObserver dtls_srtp_transport_observer_;
webrtc::TransportObserver srtp_transport_observer_;
};
TEST_F(DtlsSrtpTransportIntegrationTest, SendRtpFromSrtpToDtlsSrtp) {
Connect();
SetupClientKeysManually();
SendRtpPacketFromSrtpToDtlsSrtp();
}
TEST_F(DtlsSrtpTransportIntegrationTest, SendRtpFromDtlsSrtpToSrtp) {
Connect();
SetupClientKeysManually();
SendRtpPacketFromDtlsSrtpToSrtp();
}
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