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MediaSession.cpp
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MediaSession.cpp
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/*
* Copyright 2016-2017 TATA ELXSI
* Copyright 2016-2017 Metrological
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "MediaSession.h"
#include "Policy.h"
#include <assert.h>
#include <iostream>
#include <openssl/aes.h>
#include <openssl/evp.h>
#include <sstream>
#include <string>
#include <string.h>
#include <sys/utsname.h>
#include <core/core.h>
#define NYI_KEYSYSTEM "keysystem-placeholder"
#include <nexus_memory.h>
using namespace std;
namespace CDMi {
WPEFramework::Core::CriticalSection g_lock;
MediaKeySession::MediaKeySession(widevine::Cdm *cdm, int32_t licenseType)
: m_cdm(cdm)
, m_CDMData("")
, m_initData("")
, m_initDataType(widevine::Cdm::kCenc)
, m_licenseType((widevine::Cdm::SessionType)licenseType)
, m_sessionId("")
, m_pNexusMemory(nullptr)
, m_NexusMemorySize(512 * 1024) {
m_cdm->createSession(m_licenseType, &m_sessionId);
::memset(m_IV, 0 , sizeof(m_IV));
NEXUS_Memory_Allocate(m_NexusMemorySize, nullptr, &m_pNexusMemory);
if (!m_pNexusMemory) {
printf("Memory allocation failure\n");
m_NexusMemorySize = 0;
}
}
MediaKeySession::~MediaKeySession(void) {
if (m_pNexusMemory) {
NEXUS_Memory_Free(m_pNexusMemory);
m_NexusMemorySize = 0;
}
}
void MediaKeySession::Run(const IMediaKeySessionCallback *f_piMediaKeySessionCallback) {
if (f_piMediaKeySessionCallback) {
m_piCallback = const_cast<IMediaKeySessionCallback*>(f_piMediaKeySessionCallback);
widevine::Cdm::Status status = m_cdm->generateRequest(m_sessionId, m_initDataType, m_initData);
if (widevine::Cdm::kSuccess != status) {
printf("generateRequest failed\n");
m_piCallback->OnKeyMessage((const uint8_t *) "", 0, "");
}
}
else {
m_piCallback = nullptr;
}
}
void MediaKeySession::onMessage(widevine::Cdm::MessageType f_messageType, const std::string& f_message) {
std::string destUrl;
std::string message;
switch (f_messageType) {
case widevine::Cdm::kLicenseRequest:
case widevine::Cdm::kLicenseRenewal:
case widevine::Cdm::kLicenseRelease:
{
destUrl.assign(kLicenseServer);
// FIXME: Errrr, this is weird.
//if ((Cdm::MessageType)f_message[1] == (Cdm::kIndividualizationRequest + 1)) {
// LOGI("switching message type to kIndividualizationRequest");
// messageType = Cdm::kIndividualizationRequest;
//}
message = std::to_string(f_messageType) + ":Type:";
break;
}
default:
printf("unsupported message type %d\n", f_messageType);
break;
}
message.append(f_message.c_str(), f_message.size());
m_piCallback->OnKeyMessage((const uint8_t*) message.c_str(), message.size(), (char*) destUrl.c_str());
}
static const char* widevineKeyStatusToCString(widevine::Cdm::KeyStatus widevineStatus)
{
switch (widevineStatus) {
case widevine::Cdm::kUsable:
return "KeyUsable";
break;
case widevine::Cdm::kExpired:
return "KeyExpired";
break;
case widevine::Cdm::kOutputRestricted:
return "KeyOutputRestricted";
break;
case widevine::Cdm::kStatusPending:
return "KeyStatusPending";
break;
case widevine::Cdm::kInternalError:
return "KeyInternalError";
break;
case widevine::Cdm::kReleased:
return "KeyReleased";
break;
default:
return "UnknownError";
break;
}
}
void MediaKeySession::onKeyStatusChange()
{
widevine::Cdm::KeyStatusMap map;
if (widevine::Cdm::kSuccess != m_cdm->getKeyStatuses(m_sessionId, &map))
return;
for (const auto& pair : map) {
const std::string& keyValue = pair.first;
widevine::Cdm::KeyStatus keyStatus = pair.second;
m_piCallback->OnKeyStatusUpdate(widevineKeyStatusToCString(keyStatus),
reinterpret_cast<const uint8_t*>(keyValue.c_str()),
keyValue.length());
}
m_piCallback->OnKeyStatusesUpdated();
}
void MediaKeySession::onKeyStatusError(widevine::Cdm::Status status) {
std::string errorStatus;
switch (status) {
case widevine::Cdm::kNeedsDeviceCertificate:
errorStatus = "NeedsDeviceCertificate";
break;
case widevine::Cdm::kSessionNotFound:
errorStatus = "SessionNotFound";
break;
case widevine::Cdm::kDecryptError:
errorStatus = "DecryptError";
break;
case widevine::Cdm::kTypeError:
errorStatus = "TypeError";
break;
case widevine::Cdm::kQuotaExceeded:
errorStatus = "QuotaExceeded";
break;
case widevine::Cdm::kNotSupported:
errorStatus = "NotSupported";
break;
default:
errorStatus = "UnExpectedError";
break;
}
m_piCallback->OnError(0, CDMi_S_FALSE, errorStatus.c_str());
}
void MediaKeySession::onRemoveComplete() {
widevine::Cdm::KeyStatusMap map;
if (widevine::Cdm::kSuccess == m_cdm->getKeyStatuses(m_sessionId, &map)) {
for (const auto& pair : map) {
const std::string& keyValue = pair.first;
m_piCallback->OnKeyStatusUpdate("KeyReleased",
reinterpret_cast<const uint8_t*>(keyValue.c_str()),
keyValue.length());
}
m_piCallback->OnKeyStatusesUpdated();
}
}
void MediaKeySession::onDeferredComplete(widevine::Cdm::Status) {
}
void MediaKeySession::onDirectIndividualizationRequest(
const std::string& session_id,
const std::string& request) {
}
CDMi_RESULT MediaKeySession::Load(void) {
CDMi_RESULT ret = CDMi_S_FALSE;
g_lock.Lock();
widevine::Cdm::Status status = m_cdm->load(m_sessionId);
if (widevine::Cdm::kSuccess != status)
onKeyStatusError(status);
else
ret = CDMi_SUCCESS;
g_lock.Unlock();
return ret;
}
void MediaKeySession::Update(
const uint8_t *f_pbKeyMessageResponse,
uint32_t f_cbKeyMessageResponse) {
std::string keyResponse(reinterpret_cast<const char*>(f_pbKeyMessageResponse),
f_cbKeyMessageResponse);
g_lock.Lock();
widevine::Cdm::Status status = m_cdm->update(m_sessionId, keyResponse);
if (widevine::Cdm::kSuccess != status)
onKeyStatusChange();
g_lock.Unlock();
}
CDMi_RESULT MediaKeySession::Remove(void) {
CDMi_RESULT ret = CDMi_S_FALSE;
g_lock.Lock();
widevine::Cdm::Status status = m_cdm->remove(m_sessionId);
if (widevine::Cdm::kSuccess != status)
onKeyStatusError(status);
else
ret = CDMi_SUCCESS;
g_lock.Unlock();
return ret;
}
CDMi_RESULT MediaKeySession::Close(void) {
CDMi_RESULT status = CDMi_S_FALSE;
g_lock.Lock();
if (widevine::Cdm::kSuccess == m_cdm->close(m_sessionId))
status = CDMi_SUCCESS;
g_lock.Unlock();
return status;
}
const char* MediaKeySession::GetSessionId(void) const {
return m_sessionId.c_str();
}
const char* MediaKeySession::GetKeySystem(void) const {
return NYI_KEYSYSTEM;//TODO: replace with keysystem and test
}
CDMi_RESULT MediaKeySession::Init(
int32_t licenseType,
const char *f_pwszInitDataType,
const uint8_t *f_pbInitData,
uint32_t f_cbInitData,
const uint8_t *f_pbCDMData,
uint32_t f_cbCDMData) {
switch ((LicenseType)licenseType) {
case PersistentUsageRecord:
m_licenseType = widevine::Cdm::kPersistentUsageRecord;
break;
case PersistentLicense:
m_licenseType = widevine::Cdm::kPersistentLicense;
break;
default:
m_licenseType = widevine::Cdm::kTemporary;
break;
}
if (f_pwszInitDataType) {
if (!strcmp(f_pwszInitDataType, "cenc"))
m_initDataType = widevine::Cdm::kCenc;
else if (!strcmp(f_pwszInitDataType, "webm"))
m_initDataType = widevine::Cdm::kWebM;
}
if (f_pbInitData && f_cbInitData)
m_initData.assign((const char*) f_pbInitData, f_cbInitData);
if (f_pbCDMData && f_cbCDMData)
m_CDMData.assign((const char*) f_pbCDMData, f_cbCDMData);
return CDMi_SUCCESS;
}
CDMi_RESULT MediaKeySession::Decrypt(
const uint8_t *f_pbSessionKey,
uint32_t f_cbSessionKey,
const uint32_t *f_pdwSubSampleMapping,
uint32_t f_cdwSubSampleMapping,
const uint8_t *f_pbIV,
uint32_t f_cbIV,
const uint8_t *f_pbData,
uint32_t f_cbData,
uint32_t *f_pcbOpaqueClearContent,
uint8_t **f_ppbOpaqueClearContent,
const uint8_t keyIdLength,
const uint8_t* keyId,
bool /* initWithLast15 */)
{
static NEXUS_HeapHandle secureHeap = NEXUS_Heap_Lookup(NEXUS_HeapLookupType_eCompressedRegion);
g_lock.Lock();
widevine::Cdm::KeyStatusMap map;
std::string keyStatus;
CDMi_RESULT status = CDMi_S_FALSE;
*f_pcbOpaqueClearContent = 0;
memcpy(m_IV, f_pbIV, (f_cbIV > 16 ? 16 : f_cbIV));
if (f_cbIV < 16) {
memset(&(m_IV[f_cbIV]), 0, 16 - f_cbIV);
}
// Reallocate input memory if needed.
if (f_cbData > m_NexusMemorySize) {
void *newBuffer = nullptr;
int rc = NEXUS_Memory_Allocate(f_cbData, nullptr, &newBuffer);
if( rc != 0 ) {
printf("NexusMemory to small, use larger buffer. could not allocate memory %d", f_cbData);
return status;
}
NEXUS_Memory_Free(m_pNexusMemory);
m_pNexusMemory = newBuffer;
m_NexusMemorySize = f_cbData;
printf("NexusMemory to small, use larger buffer. allocate memory %d", f_cbData);
}
NEXUS_MemoryBlockHandle pNexusMemoryBlock = NEXUS_MemoryBlock_Allocate(secureHeap, f_cbData, 0, nullptr);
if (!pNexusMemoryBlock) {
printf("NexusBlockMemory could not allocate %d", f_cbData);
return status;
}
NEXUS_Error rc;
void *pOpaqueData = nullptr;
rc = NEXUS_MemoryBlock_Lock(pNexusMemoryBlock, &pOpaqueData);
if (rc) {
printf("NexusBlockMemory is not usable");
NEXUS_MemoryBlock_Free(pNexusMemoryBlock);
pOpaqueData = nullptr;
return status;
}
NEXUS_MemoryBlockTokenHandle pToken = NEXUS_MemoryBlock_CreateToken(pNexusMemoryBlock);
if (!pToken) {
printf("Could not create a token for another process");
NEXUS_MemoryBlock_Unlock(pNexusMemoryBlock);
NEXUS_MemoryBlock_Free(pNexusMemoryBlock);
pOpaqueData = nullptr;
return status;
}
// Copy provided payload to Input of Decryption.
::memcpy(m_pNexusMemory, f_pbData, f_cbData);
if (widevine::Cdm::kSuccess == m_cdm->getKeyStatuses(m_sessionId, &map)) {
widevine::Cdm::KeyStatusMap::iterator it = map.begin();
// FIXME: We just check the first key? How do we know that's the Widevine key and not, say, a PlayReady one?
if (widevine::Cdm::kUsable == it->second) {
widevine::Cdm::OutputBuffer output;
output.data = reinterpret_cast<uint8_t*>(pOpaqueData);
output.data_length = f_cbData;
output.is_secure = true;
widevine::Cdm::InputBuffer input;
input.data = reinterpret_cast<uint8_t*>(m_pNexusMemory);
input.data_length = output.data_length;
input.key_id = keyId;
input.key_id_length = keyIdLength;
input.iv = m_IV;
input.iv_length = sizeof(m_IV);
input.encryption_scheme = widevine::Cdm::kAesCtr;
input.is_video = true;
input.block_offset = 0;
for (int ii = 15, counter = 0; ii >= 12; ii--, counter = counter >> 8) {
m_IV[ii] = counter & 0xFF;
}
input.first_subsample = true;
input.last_subsample = true;
if (widevine::Cdm::kSuccess == m_cdm->decrypt(input, output)) {
status = CDMi_SUCCESS;
} else {
printf("CDM decrypt failed!\n");
}
}
}
// Return clear content.
*f_pcbOpaqueClearContent = sizeof(pToken);
*f_ppbOpaqueClearContent = reinterpret_cast<uint8_t*>(&pToken);
NEXUS_MemoryBlock_Unlock(pNexusMemoryBlock);
NEXUS_MemoryBlock_Free(pNexusMemoryBlock);
g_lock.Unlock();
return status;
}
CDMi_RESULT MediaKeySession::ReleaseClearContent(
const uint8_t *f_pbSessionKey,
uint32_t f_cbSessionKey,
const uint32_t f_cbClearContentOpaque,
uint8_t *f_pbClearContentOpaque ){
CDMi_RESULT ret = CDMi_S_FALSE;
if (f_pbClearContentOpaque) {
free(f_pbClearContentOpaque);
ret = CDMi_SUCCESS;
}
return ret;
}
} // namespace CDMi