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避免对外传递 srtp 依赖

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This commit is contained in:
Xiaofeng Wang 2022-07-26 00:04:03 +08:00
parent 388bf71813
commit 0fc38bbadb
3 changed files with 251 additions and 270 deletions
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113
webrtc/SrtpSession.cpp
View File

@ -20,15 +20,20 @@ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
// #define MS_LOG_DEV_LEVEL 3
#include "SrtpSession.hpp"
#include <cstring> // std::memset(), std::memcpy()
#include "logger.h"
#include "Util/util.h"
#include "Util/logger.h"
#include "Util/util.h"
#include "logger.h"
#include <srtp2/srtp.h>
#include <cstring> // std::memset(), std::memcpy()
#include <vector>
using namespace toolkit;
namespace RTC
{
namespace RTC {
/* Static. */
static std::vector<const char *> errors = {
@ -57,11 +62,24 @@ namespace RTC
"error parsing data (srtp_err_status_parse_err)",
"error encoding data (srtp_err_status_encode_err)",
"error while using semaphores (srtp_err_status_semaphore_err)",
"error while using pfkey (srtp_err_status_pfkey_err)"};
// clang-format on
"error while using pfkey (srtp_err_status_pfkey_err)"
};
/* Static methods. */
class DepLibSRTP : public std::enable_shared_from_this<DepLibSRTP> {
public:
using Ptr = std::shared_ptr<DepLibSRTP>;
~DepLibSRTP();
static bool IsError(srtp_err_status_t code);
static const char *GetErrorString(srtp_err_status_t code);
static DepLibSRTP &Instance();
private:
DepLibSRTP();
};
const char *DepLibSRTP::GetErrorString(srtp_err_status_t code) {
// This throws out_of_range if the given index is not in the vector.
return errors.at(code);
@ -104,8 +122,7 @@ namespace RTC
// Set libsrtp event handler.
err = srtp_install_event_handler([](srtp_event_data_t *data) {
MS_TRACE();
switch (data->event)
{
switch (data->event) {
case event_ssrc_collision:
MS_WARN_TAG(srtp, "SSRC collision occurred");
break;
@ -124,8 +141,7 @@ namespace RTC
}
});
if (DepLibSRTP::IsError(err))
{
if (DepLibSRTP::IsError(err)) {
MS_THROW_ERROR("srtp_install_event_handler() failed: %s", DepLibSRTP::GetErrorString(err));
}
}
@ -139,8 +155,7 @@ namespace RTC
/* Instance methods. */
SrtpSession::SrtpSession(Type type, CryptoSuite cryptoSuite, uint8_t* key, size_t keyLen)
{
SrtpSession::SrtpSession(Type type, CryptoSuite cryptoSuite, uint8_t *key, size_t keyLen) {
_env = DepLibSRTP::Instance().shared_from_this();
MS_TRACE();
@ -149,18 +164,15 @@ namespace RTC
// Set all policy fields to 0.
std::memset(&policy, 0, sizeof(srtp_policy_t));
switch (cryptoSuite)
{
case CryptoSuite::AES_CM_128_HMAC_SHA1_80:
{
switch (cryptoSuite) {
case CryptoSuite::AES_CM_128_HMAC_SHA1_80: {
srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&policy.rtp);
srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&policy.rtcp);
break;
}
case CryptoSuite::AES_CM_128_HMAC_SHA1_32:
{
case CryptoSuite::AES_CM_128_HMAC_SHA1_32: {
srtp_crypto_policy_set_aes_cm_128_hmac_sha1_32(&policy.rtp);
// NOTE: Must be 80 for RTCP.
srtp_crypto_policy_set_aes_cm_128_hmac_sha1_80(&policy.rtcp);
@ -168,34 +180,28 @@ namespace RTC
break;
}
case CryptoSuite::AEAD_AES_256_GCM:
{
case CryptoSuite::AEAD_AES_256_GCM: {
srtp_crypto_policy_set_aes_gcm_256_16_auth(&policy.rtp);
srtp_crypto_policy_set_aes_gcm_256_16_auth(&policy.rtcp);
break;
}
case CryptoSuite::AEAD_AES_128_GCM:
{
case CryptoSuite::AEAD_AES_128_GCM: {
srtp_crypto_policy_set_aes_gcm_128_16_auth(&policy.rtp);
srtp_crypto_policy_set_aes_gcm_128_16_auth(&policy.rtcp);
break;
}
default:
{
default: {
MS_ABORT("unknown SRTP crypto suite");
}
}
MS_ASSERT(
(int)keyLen == policy.rtp.cipher_key_len,
"given keyLen does not match policy.rtp.cipher_keyLen");
MS_ASSERT((int)keyLen == policy.rtp.cipher_key_len, "given keyLen does not match policy.rtp.cipher_keyLen");
switch (type)
{
switch (type) {
case Type::INBOUND:
policy.ssrc.type = ssrc_any_inbound;
break;
@ -219,12 +225,10 @@ namespace RTC
MS_THROW_ERROR("srtp_create() failed: %s", DepLibSRTP::GetErrorString(err));
}
SrtpSession::~SrtpSession()
{
SrtpSession::~SrtpSession() {
MS_TRACE();
if (this->session != nullptr)
{
if (this->session != nullptr) {
srtp_err_status_t err = srtp_dealloc(this->session);
if (DepLibSRTP::IsError(err))
@ -232,14 +236,11 @@ namespace RTC
}
}
bool SrtpSession::EncryptRtp(uint8_t* data, int* len)
{
bool SrtpSession::EncryptRtp(uint8_t *data, int *len) {
MS_TRACE();
srtp_err_status_t err =
srtp_protect(this->session, static_cast<void*>(data), reinterpret_cast<int*>(len));
srtp_err_status_t err = srtp_protect(this->session, static_cast<void *>(data), reinterpret_cast<int *>(len));
if (DepLibSRTP::IsError(err))
{
if (DepLibSRTP::IsError(err)) {
WarnL << "srtp_protect() failed:" << DepLibSRTP::GetErrorString(err);
return false;
}
@ -247,15 +248,12 @@ namespace RTC
return true;
}
bool SrtpSession::DecryptSrtp(uint8_t* data, int* len)
{
bool SrtpSession::DecryptSrtp(uint8_t *data, int *len) {
MS_TRACE();
srtp_err_status_t err =
srtp_unprotect(this->session, static_cast<void*>(data), reinterpret_cast<int*>(len));
srtp_err_status_t err = srtp_unprotect(this->session, static_cast<void *>(data), reinterpret_cast<int *>(len));
if (DepLibSRTP::IsError(err))
{
if (DepLibSRTP::IsError(err)) {
WarnL << "srtp_unprotect() failed:" << DepLibSRTP::GetErrorString(err);
return false;
}
@ -263,14 +261,11 @@ namespace RTC
return true;
}
bool SrtpSession::EncryptRtcp(uint8_t* data, int* len)
{
bool SrtpSession::EncryptRtcp(uint8_t *data, int *len) {
MS_TRACE();
srtp_err_status_t err = srtp_protect_rtcp(
this->session, static_cast<void*>(data), reinterpret_cast<int*>(len));
srtp_err_status_t err = srtp_protect_rtcp(this->session, static_cast<void *>(data), reinterpret_cast<int *>(len));
if (DepLibSRTP::IsError(err))
{
if (DepLibSRTP::IsError(err)) {
WarnL << "srtp_protect_rtcp() failed:" << DepLibSRTP::GetErrorString(err);
return false;
}
@ -278,19 +273,21 @@ namespace RTC
return true;
}
bool SrtpSession::DecryptSrtcp(uint8_t* data, int* len)
{
bool SrtpSession::DecryptSrtcp(uint8_t *data, int *len) {
MS_TRACE();
srtp_err_status_t err =
srtp_unprotect_rtcp(this->session, static_cast<void*>(data), reinterpret_cast<int*>(len));
srtp_err_status_t err = srtp_unprotect_rtcp(this->session, static_cast<void *>(data), reinterpret_cast<int *>(len));
if (DepLibSRTP::IsError(err))
{
if (DepLibSRTP::IsError(err)) {
WarnL << "srtp_unprotect_rtcp() failed:" << DepLibSRTP::GetErrorString(err);
return false;
}
return true;
}
void SrtpSession::RemoveStream(uint32_t ssrc) {
srtp_remove_stream(this->session, uint32_t { htonl(ssrc) });
}
} // namespace RTC

45
webrtc/SrtpSession.hpp
View File

@ -20,31 +20,18 @@ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#define MS_RTC_SRTP_SESSION_HPP
#include "Utils.hpp"
#include <srtp2/srtp.h>
#include <vector>
#include <memory>
namespace RTC
{
class DepLibSRTP : public std::enable_shared_from_this<DepLibSRTP>
{
typedef struct srtp_ctx_t_ *srtp_t;
namespace RTC {
class DepLibSRTP;
class SrtpSession {
public:
using Ptr = std::shared_ptr<DepLibSRTP>;
~DepLibSRTP();
static bool IsError(srtp_err_status_t code);
static const char *GetErrorString(srtp_err_status_t code);
static DepLibSRTP &Instance();
private:
DepLibSRTP();
};
class SrtpSession
{
public:
enum class CryptoSuite
{
enum class CryptoSuite {
NONE = 0,
AES_CM_128_HMAC_SHA1_80 = 1,
AES_CM_128_HMAC_SHA1_32,
@ -53,11 +40,7 @@ namespace RTC
};
public:
enum class Type
{
INBOUND = 1,
OUTBOUND
};
enum class Type { INBOUND = 1, OUTBOUND };
public:
SrtpSession(Type type, CryptoSuite cryptoSuite, uint8_t *key, size_t keyLen);
@ -68,16 +51,14 @@ namespace RTC
bool DecryptSrtp(uint8_t *data, int *len);
bool EncryptRtcp(uint8_t *data, int *len);
bool DecryptSrtcp(uint8_t *data, int *len);
void RemoveStream(uint32_t ssrc)
{
srtp_remove_stream(this->session, uint32_t{ htonl(ssrc) });
}
void RemoveStream(uint32_t ssrc);
private:
// Allocated by this.
srtp_t session { nullptr };
DepLibSRTP::Ptr _env;
std::shared_ptr<DepLibSRTP> _env;
};
} // namespace RTC
#endif

3
webrtc/WebRtcTransport.cpp
View File

@ -13,6 +13,9 @@
#include "Rtcp/RtcpFCI.h"
#include "RtpExt.h"
#include "Rtsp/RtpReceiver.h"
#include <srtp2/srtp.h>
#include <iostream>
#define RTP_SSRC_OFFSET 1