зеркало из https://github.com/mozilla/gecko-dev.git
Bug 1044742 - ClearKey CDM for testing EME - r=cpearce
This commit is contained in:
Edwin Flores
Родитель
ed35a1118c
Коммит
0afabd88d4
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include <assert.h>
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#include <sstream>
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#include <stdint.h>
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#include <stdio.h>
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#include "ClearKeyDecryptionManager.h"
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#include "ClearKeyUtils.h"
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#include "mozilla/NullPtr.h"
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using namespace mozilla;
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using namespace std;
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class ClearKeyDecryptor
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{
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public:
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ClearKeyDecryptor(GMPDecryptorCallback* aCallback, const Key& aKey);
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~ClearKeyDecryptor();
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void InitKey();
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void QueueDecrypt(GMPBuffer* aBuffer, GMPEncryptedBufferMetadata* aMetadata);
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uint32_t AddRef();
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uint32_t Release();
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private:
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struct DecryptTask : public GMPTask
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{
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DecryptTask(ClearKeyDecryptor* aTarget, GMPBuffer* aBuffer,
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GMPEncryptedBufferMetadata* aMetadata)
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: mTarget(aTarget), mBuffer(aBuffer), mMetadata(aMetadata) { }
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virtual void Run() MOZ_OVERRIDE
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{
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mTarget->Decrypt(mBuffer, mMetadata);
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}
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virtual void Destroy() MOZ_OVERRIDE {
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delete this;
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}
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virtual ~DecryptTask() { }
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ClearKeyDecryptor* mTarget;
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GMPBuffer* mBuffer;
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GMPEncryptedBufferMetadata* mMetadata;
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};
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struct DestroyTask : public GMPTask
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{
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DestroyTask(ClearKeyDecryptor* aTarget) : mTarget(aTarget) { }
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virtual void Run() MOZ_OVERRIDE {
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delete mTarget;
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}
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virtual void Destroy() MOZ_OVERRIDE {
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delete this;
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}
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virtual ~DestroyTask() { }
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ClearKeyDecryptor* mTarget;
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};
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void Decrypt(GMPBuffer* aBuffer, GMPEncryptedBufferMetadata* aMetadata);
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uint32_t mRefCnt;
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GMPDecryptorCallback* mCallback;
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GMPThread* mThread;
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Key mKey;
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};
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ClearKeyDecryptionManager::ClearKeyDecryptionManager(GMPDecryptorHost* aHost)
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: mHost(aHost)
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{
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CK_LOGD("ClearKeyDecryptionManager ctor");
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}
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ClearKeyDecryptionManager::~ClearKeyDecryptionManager()
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{
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CK_LOGD("ClearKeyDecryptionManager dtor");
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}
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void
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ClearKeyDecryptionManager::Init(GMPDecryptorCallback* aCallback)
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{
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CK_LOGD("ClearKeyDecryptionManager::Init");
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mCallback = aCallback;
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mCallback->SetCapabilities(GMP_EME_CAP_DECRYPT_AUDIO |
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GMP_EME_CAP_DECRYPT_VIDEO);
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}
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static string
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GetNewSessionId()
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{
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static uint32_t sNextSessionId = 0;
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string sessionId;
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stringstream ss;
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ss << ++sNextSessionId;
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ss >> sessionId;
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return sessionId;
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}
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void
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ClearKeyDecryptionManager::CreateSession(uint32_t aPromiseId,
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const char* aInitDataType,
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uint32_t aInitDataTypeSize,
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const uint8_t* aInitData,
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uint32_t aInitDataSize,
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GMPSessionType aSessionType)
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{
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CK_LOGD("ClearKeyDecryptionManager::CreateSession type:%s", aInitDataType);
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// initDataType must be "cenc".
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if (strcmp("cenc", aInitDataType)) {
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mCallback->RejectPromise(aPromiseId, kGMPNotSupportedError,
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nullptr /* message */, 0 /* messageLen */);
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return;
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}
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string sessionId = GetNewSessionId();
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assert(mSessions.find(sessionId) == mSessions.end());
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ClearKeySession* session = new ClearKeySession(sessionId, mHost, mCallback);
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session->Init(aPromiseId, aInitData, aInitDataSize);
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mSessions[sessionId] = session;
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const vector<KeyId>& sessionKeys = session->GetKeyIds();
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vector<KeyId> neededKeys;
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for (auto it = sessionKeys.begin(); it != sessionKeys.end(); it++) {
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if (mDecryptors.find(*it) == mDecryptors.end()) {
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// Need to request this key ID from the client.
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neededKeys.push_back(*it);
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mDecryptors[*it] = nullptr;
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} else {
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// We already have a key for this key ID. Mark as usable.
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mCallback->KeyIdUsable(sessionId.c_str(), sessionId.length(),
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&(*it)[0], it->size());
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}
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}
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if (neededKeys.empty()) {
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CK_LOGD("No keys needed from client.");
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return;
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}
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// Send a request for needed key data.
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string request;
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ClearKeyUtils::MakeKeyRequest(neededKeys, request);
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mCallback->SessionMessage(&sessionId[0], sessionId.length(),
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(uint8_t*)&request[0], request.length(),
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"" /* destination url */, 0);
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}
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void
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ClearKeyDecryptionManager::LoadSession(uint32_t aPromiseId,
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const char* aSessionId,
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uint32_t aSessionIdLength)
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{
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// TODO implement "persistent" sessions.
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mCallback->RejectPromise(aPromiseId, kGMPNotSupportedError,
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nullptr /* message */, 0 /* messageLen */);
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CK_LOGD("ClearKeyDecryptionManager::LoadSession");
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}
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void
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ClearKeyDecryptionManager::UpdateSession(uint32_t aPromiseId,
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const char* aSessionId,
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uint32_t aSessionIdLength,
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const uint8_t* aResponse,
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uint32_t aResponseSize)
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{
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CK_LOGD("ClearKeyDecryptionManager::UpdateSession");
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string sessionId(aSessionId, aSessionId + aSessionIdLength);
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if (mSessions.find(sessionId) == mSessions.end() || !mSessions[sessionId]) {
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CK_LOGW("ClearKey CDM couldn't resolve session ID in UpdateSession.");
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mCallback->RejectPromise(aPromiseId, kGMPNotFoundError, nullptr, 0);
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return;
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}
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// Parse the response for any (key ID, key) pairs.
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vector<KeyIdPair> keyPairs;
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if (!ClearKeyUtils::ParseJWK(aResponse, aResponseSize, keyPairs)) {
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CK_LOGW("ClearKey CDM failed to parse JSON Web Key.");
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mCallback->RejectPromise(aPromiseId, kGMPAbortError, nullptr, 0);
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return;
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}
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mCallback->ResolvePromise(aPromiseId);
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for (auto it = keyPairs.begin(); it != keyPairs.end(); it++) {
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KeyId& keyId = it->mKeyId;
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if (mDecryptors.find(keyId) != mDecryptors.end()) {
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mDecryptors[keyId] = new ClearKeyDecryptor(mCallback, it->mKey);
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mCallback->KeyIdUsable(aSessionId, aSessionIdLength,
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&keyId[0], keyId.size());
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}
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mDecryptors[keyId]->AddRef();
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}
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}
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void
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ClearKeyDecryptionManager::CloseSession(uint32_t aPromiseId,
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const char* aSessionId,
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uint32_t aSessionIdLength)
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{
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CK_LOGD("ClearKeyDecryptionManager::CloseSession");
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string sessionId(aSessionId, aSessionId + aSessionIdLength);
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ClearKeySession* session = mSessions[sessionId];
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assert(session);
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const vector<KeyId>& keyIds = session->GetKeyIds();
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for (auto it = keyIds.begin(); it != keyIds.end(); it++) {
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assert(mDecryptors.find(*it) != mDecryptors.end());
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if (!mDecryptors[*it]->Release()) {
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mDecryptors.erase(*it);
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mCallback->KeyIdNotUsable(aSessionId, aSessionIdLength,
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&(*it)[0], it->size());
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}
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}
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mSessions.erase(sessionId);
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delete session;
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mCallback->ResolvePromise(aPromiseId);
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}
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void
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ClearKeyDecryptionManager::RemoveSession(uint32_t aPromiseId,
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const char* aSessionId,
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uint32_t aSessionIdLength)
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{
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// TODO implement "persistent" sessions.
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CK_LOGD("ClearKeyDecryptionManager::RemoveSession");
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mCallback->RejectPromise(aPromiseId, kGMPInvalidAccessError,
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nullptr /* message */, 0 /* messageLen */);
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}
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void
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ClearKeyDecryptionManager::SetServerCertificate(uint32_t aPromiseId,
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const uint8_t* aServerCert,
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uint32_t aServerCertSize)
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{
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// ClearKey CDM doesn't support this method by spec.
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CK_LOGD("ClearKeyDecryptionManager::SetServerCertificate");
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mCallback->RejectPromise(aPromiseId, kGMPNotSupportedError,
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nullptr /* message */, 0 /* messageLen */);
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}
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void
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ClearKeyDecryptionManager::Decrypt(GMPBuffer* aBuffer,
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GMPEncryptedBufferMetadata* aMetadata)
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{
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CK_LOGD("ClearKeyDecryptionManager::Decrypt");
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KeyId keyId(aMetadata->KeyId(), aMetadata->KeyId() + aMetadata->KeyIdSize());
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if (mDecryptors.find(keyId) == mDecryptors.end() || !mDecryptors[keyId]) {
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mCallback->Decrypted(aBuffer, GMPNoKeyErr);
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}
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mDecryptors[keyId]->QueueDecrypt(aBuffer, aMetadata);
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}
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void
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ClearKeyDecryptionManager::DecryptingComplete()
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{
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CK_LOGD("ClearKeyDecryptionManager::DecryptingComplete");
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for (auto it = mSessions.begin(); it != mSessions.end(); it++) {
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delete it->second;
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}
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for (auto it = mDecryptors.begin(); it != mDecryptors.end(); it++) {
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delete it->second;
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}
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delete this;
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}
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void
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ClearKeyDecryptor::QueueDecrypt(GMPBuffer* aBuffer,
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GMPEncryptedBufferMetadata* aMetadata)
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{
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CK_LOGD("ClearKeyDecryptor::QueueDecrypt");
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mThread->Post(new DecryptTask(this, aBuffer, aMetadata));
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}
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void
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ClearKeyDecryptor::Decrypt(GMPBuffer* aBuffer,
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GMPEncryptedBufferMetadata* aMetadata)
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{
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if (!mThread) {
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mCallback->Decrypted(aBuffer, GMPGenericErr);
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}
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// If the sample is split up into multiple encrypted subsamples, we need to
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// stitch them into one continuous buffer for decryption.
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vector<uint8_t> tmp(aBuffer->Size());
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if (aMetadata->NumSubsamples()) {
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// Take all encrypted parts of subsamples and stitch them into one
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// continuous encrypted buffer.
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unsigned char* data = aBuffer->Data();
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unsigned char* iter = &tmp[0];
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for (size_t i = 0; i < aMetadata->NumSubsamples(); i++) {
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data += aMetadata->ClearBytes()[i];
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uint32_t cipherBytes = aMetadata->CipherBytes()[i];
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memcpy(iter, data, cipherBytes);
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data += cipherBytes;
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iter += cipherBytes;
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}
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tmp.resize((size_t)(iter - &tmp[0]));
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} else {
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memcpy(&tmp[0], aBuffer->Data(), aBuffer->Size());
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}
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assert(aMetadata->IVSize() == 8 || aMetadata->IVSize() == 16);
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vector<uint8_t> iv(aMetadata->IV(), aMetadata->IV() + aMetadata->IVSize());
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iv.insert(iv.end(), CLEARKEY_KEY_LEN - aMetadata->IVSize(), 0);
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ClearKeyUtils::DecryptAES(mKey, tmp, iv);
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if (aMetadata->NumSubsamples()) {
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// Take the decrypted buffer, split up into subsamples, and insert those
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// subsamples back into their original position in the original buffer.
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unsigned char* data = aBuffer->Data();
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unsigned char* iter = &tmp[0];
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for (size_t i = 0; i < aMetadata->NumSubsamples(); i++) {
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data += aMetadata->ClearBytes()[i];
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uint32_t cipherBytes = aMetadata->CipherBytes()[i];
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memcpy(data, iter, cipherBytes);
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data += cipherBytes;
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iter += cipherBytes;
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}
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} else {
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memcpy(aBuffer->Data(), &tmp[0], aBuffer->Size());
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}
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mCallback->Decrypted(aBuffer, GMPNoErr);
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}
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ClearKeyDecryptor::ClearKeyDecryptor(GMPDecryptorCallback* aCallback,
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const Key& aKey)
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: mRefCnt(0)
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, mCallback(aCallback)
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, mKey(aKey)
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{
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if (GetPlatform()->createthread(&mThread) != GMPNoErr) {
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CK_LOGD("failed to create thread in clearkey cdm");
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mThread = nullptr;
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return;
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}
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}
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ClearKeyDecryptor::~ClearKeyDecryptor()
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{
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CK_LOGD("ClearKeyDecryptor dtor; key ID = %08x...", *(uint32_t*)&mKey[0]);
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if (mThread) {
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mThread->Join();
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}
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}
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uint32_t
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ClearKeyDecryptor::AddRef()
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{
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return ++mRefCnt;
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}
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uint32_t
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ClearKeyDecryptor::Release()
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{
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if (!--mRefCnt) {
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if (mThread) {
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mThread->Post(new DestroyTask(this));
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} else {
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delete this;
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}
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}
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return mRefCnt;
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}
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@ -0,0 +1,69 @@
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/* This Source Code Form is subject to the terms of the Mozilla Public
|
||||
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
||||
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
||||
|
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#ifndef __ClearKeyDecryptor_h__
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#define __ClearKeyDecryptor_h_
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#include <map>
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#include <string>
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#include <vector>
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#include "ClearKeySession.h"
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#include "ClearKeyUtils.h"
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#include "gmp-api/gmp-decryption.h"
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#include "ScopedNSSTypes.h"
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class ClearKeyDecryptor;
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class ClearKeyDecryptionManager MOZ_FINAL : public GMPDecryptor
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{
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public:
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ClearKeyDecryptionManager(GMPDecryptorHost* aHost);
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~ClearKeyDecryptionManager();
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virtual void Init(GMPDecryptorCallback* aCallback) MOZ_OVERRIDE;
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virtual void CreateSession(uint32_t aPromiseId,
|
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const char* aInitDataType,
|
||||
uint32_t aInitDataTypeSize,
|
||||
const uint8_t* aInitData,
|
||||
uint32_t aInitDataSize,
|
||||
GMPSessionType aSessionType) MOZ_OVERRIDE;
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||||
|
||||
virtual void LoadSession(uint32_t aPromiseId,
|
||||
const char* aSessionId,
|
||||
uint32_t aSessionIdLength) MOZ_OVERRIDE;
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||||
|
||||
virtual void UpdateSession(uint32_t aPromiseId,
|
||||
const char* aSessionId,
|
||||
uint32_t aSessionIdLength,
|
||||
const uint8_t* aResponse,
|
||||
uint32_t aResponseSize) MOZ_OVERRIDE;
|
||||
|
||||
virtual void CloseSession(uint32_t aPromiseId,
|
||||
const char* aSessionId,
|
||||
uint32_t aSessionIdLength) MOZ_OVERRIDE;
|
||||
|
||||
virtual void RemoveSession(uint32_t aPromiseId,
|
||||
const char* aSessionId,
|
||||
uint32_t aSessionIdLength) MOZ_OVERRIDE;
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||||
|
||||
virtual void SetServerCertificate(uint32_t aPromiseId,
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||||
const uint8_t* aServerCert,
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||||
uint32_t aServerCertSize) MOZ_OVERRIDE;
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||||
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||||
virtual void Decrypt(GMPBuffer* aBuffer,
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||||
GMPEncryptedBufferMetadata* aMetadata) MOZ_OVERRIDE;
|
||||
|
||||
virtual void DecryptingComplete() MOZ_OVERRIDE;
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||||
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||||
private:
|
||||
GMPDecryptorCallback* mCallback;
|
||||
GMPDecryptorHost* mHost;
|
||||
|
||||
std::map<KeyId, ClearKeyDecryptor*> mDecryptors;
|
||||
std::map<std::string, ClearKeySession*> mSessions;
|
||||
};
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||||
|
||||
#endif // __ClearKeyDecryptor_h__
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|
|
@ -0,0 +1,44 @@
|
|||
/* This Source Code Form is subject to the terms of the Mozilla Public
|
||||
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
||||
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
||||
|
||||
#include "ClearKeySession.h"
|
||||
#include "ClearKeyUtils.h"
|
||||
|
||||
#include "gmp-api/gmp-decryption.h"
|
||||
#include "mozilla/Endian.h"
|
||||
#include "pk11pub.h"
|
||||
|
||||
using namespace mozilla;
|
||||
|
||||
ClearKeySession::ClearKeySession(const std::string& aSessionId,
|
||||
GMPDecryptorHost* aHost,
|
||||
GMPDecryptorCallback* aCallback)
|
||||
: mSessionId(aSessionId)
|
||||
, mHost(aHost)
|
||||
, mCallback(aCallback)
|
||||
{
|
||||
CK_LOGD("ClearKeySession ctor %p", this);
|
||||
}
|
||||
|
||||
ClearKeySession::~ClearKeySession()
|
||||
{
|
||||
CK_LOGD("ClearKeySession dtor %p", this);
|
||||
}
|
||||
|
||||
void
|
||||
ClearKeySession::Init(uint32_t aPromiseId,
|
||||
const uint8_t* aInitData, uint32_t aInitDataSize)
|
||||
{
|
||||
CK_LOGD("ClearKeySession::Init");
|
||||
|
||||
ClearKeyUtils::ParseInitData(aInitData, aInitDataSize, mKeyIds);
|
||||
if (!mKeyIds.size()) {
|
||||
const char message[] = "Couldn't parse cenc key init data";
|
||||
mCallback->RejectPromise(aPromiseId, kGMPAbortError, message, strlen(message));
|
||||
return;
|
||||
}
|
||||
|
||||
mCallback->ResolveNewSessionPromise(aPromiseId,
|
||||
mSessionId.data(), mSessionId.length());
|
||||
}
|
||||
|
|
@ -0,0 +1,40 @@
|
|||
/* This Source Code Form is subject to the terms of the Mozilla Public
|
||||
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
||||
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
||||
|
||||
#ifndef __ClearKeySession_h__
|
||||
#define __ClearKeySession_h__
|
||||
|
||||
#include "ClearKeyUtils.h"
|
||||
|
||||
class GMPBuffer;
|
||||
class GMPDecryptorCallback;
|
||||
class GMPDecryptorHost;
|
||||
class GMPEncryptedBufferMetadata;
|
||||
|
||||
/**
|
||||
* Currently useless; will be fleshed out later with support for persistent
|
||||
* key sessions.
|
||||
*/
|
||||
|
||||
class ClearKeySession
|
||||
{
|
||||
public:
|
||||
ClearKeySession(const std::string& aSessionId,
|
||||
GMPDecryptorHost* aHost, GMPDecryptorCallback *aCallback);
|
||||
|
||||
~ClearKeySession();
|
||||
|
||||
const std::vector<KeyId>& GetKeyIds() { return mKeyIds; }
|
||||
|
||||
void Init(uint32_t aPromiseId,
|
||||
const uint8_t* aInitData, uint32_t aInitDataSize);
|
||||
private:
|
||||
std::string mSessionId;
|
||||
std::vector<KeyId> mKeyIds;
|
||||
|
||||
GMPDecryptorCallback* mCallback;
|
||||
GMPDecryptorHost* mHost;
|
||||
};
|
||||
|
||||
#endif // __ClearKeySession_h__
|
||||
|
|
@ -0,0 +1,556 @@
|
|||
/* This Source Code Form is subject to the terms of the Mozilla Public
|
||||
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
||||
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
||||
|
||||
#include <assert.h>
|
||||
#include <ctype.h>
|
||||
#include <stdarg.h>
|
||||
#include <stdint.h>
|
||||
#include <vector>
|
||||
|
||||
#include "ClearKeyUtils.h"
|
||||
#include "mozilla/Endian.h"
|
||||
#include "mozilla/NullPtr.h"
|
||||
#include "openaes/oaes_lib.h"
|
||||
|
||||
using namespace std;
|
||||
|
||||
#define FOURCC(a,b,c,d) ((a << 24) + (b << 16) + (c << 8) + d)
|
||||
|
||||
// System ID identifying the cenc v2 pssh box format; specified at:
|
||||
// https://dvcs.w3.org/hg/html-media/raw-file/tip/encrypted-media/cenc-format.html
|
||||
const uint8_t kSystemID[] = {
|
||||
0x10, 0x77, 0xef, 0xec, 0xc0, 0xb2, 0x4d, 0x02,
|
||||
0xac, 0xe3, 0x3c, 0x1e, 0x52, 0xe2, 0xfb, 0x4b
|
||||
};
|
||||
|
||||
void
|
||||
CK_Log(const char* aFmt, ...)
|
||||
{
|
||||
va_list ap;
|
||||
|
||||
va_start(ap, aFmt);
|
||||
vprintf(aFmt, ap);
|
||||
va_end(ap);
|
||||
|
||||
printf("\n");
|
||||
}
|
||||
|
||||
static void
|
||||
IncrementIV(vector<uint8_t>& aIV) {
|
||||
using mozilla::BigEndian;
|
||||
|
||||
assert(aIV.size() == 16);
|
||||
BigEndian::writeUint64(&aIV[8], BigEndian::readUint64(&aIV[8]) + 1);
|
||||
}
|
||||
|
||||
/* static */ void
|
||||
ClearKeyUtils::DecryptAES(const vector<uint8_t>& aKey,
|
||||
vector<uint8_t>& aData, vector<uint8_t>& aIV)
|
||||
{
|
||||
assert(aIV.size() == CLEARKEY_KEY_LEN);
|
||||
assert(aKey.size() == CLEARKEY_KEY_LEN);
|
||||
|
||||
OAES_CTX* aes = oaes_alloc();
|
||||
oaes_key_import_data(aes, &aKey[0], aKey.size());
|
||||
oaes_set_option(aes, OAES_OPTION_ECB, nullptr);
|
||||
|
||||
for (size_t i = 0; i < aData.size(); i += CLEARKEY_KEY_LEN) {
|
||||
size_t encLen;
|
||||
oaes_encrypt(aes, &aIV[0], CLEARKEY_KEY_LEN, nullptr, &encLen);
|
||||
|
||||
vector<uint8_t> enc(encLen);
|
||||
oaes_encrypt(aes, &aIV[0], CLEARKEY_KEY_LEN, &enc[0], &encLen);
|
||||
|
||||
for (size_t j = 0; j < CLEARKEY_KEY_LEN; j++) {
|
||||
aData[i + j] ^= enc[2 * OAES_BLOCK_SIZE + j];
|
||||
}
|
||||
IncrementIV(aIV);
|
||||
}
|
||||
|
||||
oaes_free(&aes);
|
||||
}
|
||||
|
||||
/**
|
||||
* ClearKey expects all Key IDs to be base64 encoded with non-standard alphabet
|
||||
* and padding.
|
||||
*/
|
||||
static bool
|
||||
EncodeBase64Web(vector<uint8_t> aBinary, string& aEncoded)
|
||||
{
|
||||
const char sAlphabet[] =
|
||||
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_";
|
||||
const uint8_t sMask = 0x3f;
|
||||
|
||||
aEncoded.resize((aBinary.size() * 8 + 5) / 6);
|
||||
|
||||
// Pad binary data in case there's rubbish past the last byte.
|
||||
aBinary.push_back(0);
|
||||
|
||||
// Number of bytes not consumed in the previous character
|
||||
uint32_t shift = 0;
|
||||
|
||||
auto out = aEncoded.begin();
|
||||
auto data = aBinary.begin();
|
||||
for (int i = 0; i < aEncoded.length(); i++) {
|
||||
if (shift) {
|
||||
out[i] = (*data << (6 - shift)) & sMask;
|
||||
data++;
|
||||
} else {
|
||||
out[i] = 0;
|
||||
}
|
||||
|
||||
out[i] += (*data >> (shift + 2)) & sMask;
|
||||
shift = (shift + 2) % 8;
|
||||
|
||||
out[i] = sAlphabet[out[i]];
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
/* static */ void
|
||||
ClearKeyUtils::ParseInitData(const uint8_t* aInitData, uint32_t aInitDataSize,
|
||||
vector<KeyId>& aOutKeys)
|
||||
{
|
||||
using mozilla::BigEndian;
|
||||
|
||||
uint32_t size = 0;
|
||||
for (uint32_t offset = 0; offset + sizeof(uint32_t) < aInitDataSize; offset += size) {
|
||||
const uint8_t* data = aInitData + offset;
|
||||
size = BigEndian::readUint32(data); data += sizeof(uint32_t);
|
||||
|
||||
CK_LOGD("Looking for pssh at offset %u", offset);
|
||||
|
||||
if (size + offset > aInitDataSize) {
|
||||
CK_LOGE("Box size %u overflows init data buffer", size);
|
||||
return;
|
||||
}
|
||||
|
||||
if (size < 36) {
|
||||
// Too small to be a cenc2 pssh box
|
||||
continue;
|
||||
}
|
||||
|
||||
uint32_t box = BigEndian::readUint32(data); data += sizeof(uint32_t);
|
||||
if (box != FOURCC('p','s','s','h')) {
|
||||
CK_LOGE("ClearKey CDM passed non-pssh initData");
|
||||
return;
|
||||
}
|
||||
|
||||
uint32_t head = BigEndian::readUint32(data); data += sizeof(uint32_t);
|
||||
CK_LOGD("Got version %u pssh box, length %u", head & 0xff, size);
|
||||
|
||||
if ((head >> 24) != 1) {
|
||||
// Ignore pssh boxes with wrong version
|
||||
CK_LOGD("Ignoring pssh box with wrong version");
|
||||
continue;
|
||||
}
|
||||
|
||||
if (memcmp(kSystemID, data, sizeof(kSystemID))) {
|
||||
// Ignore pssh boxes with wrong system ID
|
||||
continue;
|
||||
}
|
||||
data += sizeof(kSystemID);
|
||||
|
||||
uint32_t kidCount = BigEndian::readUint32(data); data += sizeof(uint32_t);
|
||||
if (data + kidCount * CLEARKEY_KEY_LEN > aInitData + aInitDataSize) {
|
||||
CK_LOGE("pssh key IDs overflow init data buffer");
|
||||
return;
|
||||
}
|
||||
|
||||
for (uint32_t i = 0; i < kidCount; i++) {
|
||||
aOutKeys.push_back(KeyId(data, data + CLEARKEY_KEY_LEN));
|
||||
data += CLEARKEY_KEY_LEN;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* static */ void
|
||||
ClearKeyUtils::MakeKeyRequest(const vector<KeyId>& aKeyIDs,
|
||||
string& aOutRequest)
|
||||
{
|
||||
MOZ_ASSERT(aKeyIDs.size() && aOutRequest.empty());
|
||||
|
||||
aOutRequest.append("{ \"kids\":[");
|
||||
for (size_t i = 0; i < aKeyIDs.size(); i++) {
|
||||
if (i) {
|
||||
aOutRequest.append(",");
|
||||
}
|
||||
aOutRequest.append("\"");
|
||||
|
||||
string base64key;
|
||||
EncodeBase64Web(aKeyIDs[i], base64key);
|
||||
aOutRequest.append(base64key);
|
||||
|
||||
aOutRequest.append("\"");
|
||||
}
|
||||
aOutRequest.append("], \"type\":");
|
||||
// TODO implement "persistent" session type
|
||||
aOutRequest.append("\"temporary\"");
|
||||
aOutRequest.append("}");
|
||||
}
|
||||
|
||||
#define EXPECT_SYMBOL(CTX, X) do { \
|
||||
if (GetNextSymbol(CTX) != (X)) { \
|
||||
CK_LOGE("Unexpected symbol in JWK parser"); \
|
||||
return false; \
|
||||
} \
|
||||
} while (false)
|
||||
|
||||
struct ParserContext {
|
||||
const uint8_t* mIter;
|
||||
const uint8_t* mEnd;
|
||||
};
|
||||
|
||||
static uint8_t
|
||||
PeekSymbol(ParserContext& aCtx)
|
||||
{
|
||||
for (; aCtx.mIter < aCtx.mEnd; (aCtx.mIter)++) {
|
||||
if (!isspace(*aCtx.mIter)) {
|
||||
return *aCtx.mIter;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static uint8_t
|
||||
GetNextSymbol(ParserContext& aCtx)
|
||||
{
|
||||
uint8_t sym = PeekSymbol(aCtx);
|
||||
aCtx.mIter++;
|
||||
return sym;
|
||||
}
|
||||
|
||||
static bool SkipToken(ParserContext& aCtx);
|
||||
|
||||
static bool
|
||||
SkipString(ParserContext& aCtx)
|
||||
{
|
||||
EXPECT_SYMBOL(aCtx, '"');
|
||||
for (uint8_t sym = GetNextSymbol(aCtx); sym; sym = GetNextSymbol(aCtx)) {
|
||||
if (sym == '\\') {
|
||||
sym = GetNextSymbol(aCtx);
|
||||
} else if (sym == '"') {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Skip whole object and values it contains.
|
||||
*/
|
||||
static bool
|
||||
SkipObject(ParserContext& aCtx)
|
||||
{
|
||||
EXPECT_SYMBOL(aCtx, '{');
|
||||
|
||||
if (PeekSymbol(aCtx) == '}') {
|
||||
GetNextSymbol(aCtx);
|
||||
return true;
|
||||
}
|
||||
|
||||
while (true) {
|
||||
if (!SkipString(aCtx)) return false;
|
||||
EXPECT_SYMBOL(aCtx, ':');
|
||||
if (!SkipToken(aCtx)) return false;
|
||||
|
||||
if (PeekSymbol(aCtx) == '}') {
|
||||
GetNextSymbol(aCtx);
|
||||
return true;
|
||||
}
|
||||
EXPECT_SYMBOL(aCtx, ',');
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Skip array value and the values it contains.
|
||||
*/
|
||||
static bool
|
||||
SkipArray(ParserContext& aCtx)
|
||||
{
|
||||
EXPECT_SYMBOL(aCtx, '[');
|
||||
|
||||
if (PeekSymbol(aCtx) == ']') {
|
||||
GetNextSymbol(aCtx);
|
||||
return true;
|
||||
}
|
||||
|
||||
while (SkipToken(aCtx)) {
|
||||
if (PeekSymbol(aCtx) == ']') {
|
||||
GetNextSymbol(aCtx);
|
||||
return true;
|
||||
}
|
||||
EXPECT_SYMBOL(aCtx, ',');
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Skip unquoted literals like numbers, |true|, and |null|.
|
||||
* (XXX and anything else that matches /([:alnum:]|[+-.])+/)
|
||||
*/
|
||||
static bool
|
||||
SkipLiteral(ParserContext& aCtx)
|
||||
{
|
||||
for (; aCtx.mIter < aCtx.mEnd; aCtx.mIter++) {
|
||||
if (!isalnum(*aCtx.mIter) &&
|
||||
*aCtx.mIter != '.' && *aCtx.mIter != '-' && *aCtx.mIter != '+') {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
static bool
|
||||
SkipToken(ParserContext& aCtx)
|
||||
{
|
||||
uint8_t startSym = PeekSymbol(aCtx);
|
||||
if (startSym == '"') {
|
||||
CK_LOGD("JWK parser skipping string");
|
||||
return SkipString(aCtx);
|
||||
} else if (startSym == '{') {
|
||||
CK_LOGD("JWK parser skipping object");
|
||||
return SkipObject(aCtx);
|
||||
} else if (startSym == '[') {
|
||||
CK_LOGD("JWK parser skipping array");
|
||||
return SkipArray(aCtx);
|
||||
} else {
|
||||
CK_LOGD("JWK parser skipping literal");
|
||||
return SkipLiteral(aCtx);
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
static bool
|
||||
GetNextLabel(ParserContext& aCtx, string& aOutLabel)
|
||||
{
|
||||
EXPECT_SYMBOL(aCtx, '"');
|
||||
|
||||
const uint8_t* start = aCtx.mIter;
|
||||
for (uint8_t sym = GetNextSymbol(aCtx); sym; sym = GetNextSymbol(aCtx)) {
|
||||
if (sym == '\\') {
|
||||
GetNextSymbol(aCtx);
|
||||
continue;
|
||||
}
|
||||
|
||||
if (sym == '"') {
|
||||
aOutLabel.assign(start, aCtx.mIter - 1);
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Take a base64-encoded string, convert (in-place) each character to its
|
||||
* corresponding value in the [0x00, 0x3f] range, and truncate any padding.
|
||||
*/
|
||||
static bool
|
||||
Decode6Bit(string& aStr)
|
||||
{
|
||||
for (size_t i = 0; i < aStr.length(); i++) {
|
||||
if (aStr[i] >= 'A' && aStr[i] <= 'Z') {
|
||||
aStr[i] -= 'A';
|
||||
} else if (aStr[i] >= 'a' && aStr[i] <= 'z') {
|
||||
aStr[i] -= 'a' - 26;
|
||||
} else if (aStr[i] >= '0' && aStr[i] <= '9') {
|
||||
aStr[i] -= '0' - 52;
|
||||
} else if (aStr[i] == '-' || aStr[i] == '+') {
|
||||
aStr[i] = 62;
|
||||
} else if (aStr[i] == '_' || aStr[i] == '/') {
|
||||
aStr[i] = 63;
|
||||
} else {
|
||||
// Truncate '=' padding at the end of the aString.
|
||||
if (aStr[i] != '=') {
|
||||
return false;
|
||||
}
|
||||
aStr[i] = '\0';
|
||||
aStr.resize(i);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
static bool
|
||||
DecodeBase64(string& aEncoded, vector<uint8_t>& aOutDecoded)
|
||||
{
|
||||
if (!Decode6Bit(aEncoded)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
// The number of bytes we haven't yet filled in the current byte, mod 8.
|
||||
int shift = 0;
|
||||
|
||||
aOutDecoded.resize(aEncoded.length() * 6 / 8);
|
||||
aOutDecoded.reserve(aEncoded.length() * 6 / 8 + 1);
|
||||
auto out = aOutDecoded.begin();
|
||||
for (size_t i = 0; i < aEncoded.length(); i++) {
|
||||
if (!shift) {
|
||||
*out = aEncoded[i] << 2;
|
||||
} else {
|
||||
*out |= aEncoded[i] >> (6 - shift);
|
||||
*(++out) = aEncoded[i] << (shift + 2);
|
||||
}
|
||||
shift = (shift + 2) % 8;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
static bool
|
||||
DecodeKey(string& aEncoded, Key& aOutDecoded)
|
||||
{
|
||||
return DecodeBase64(aEncoded, aOutDecoded) &&
|
||||
// Key should be 128 bits long.
|
||||
aOutDecoded.size() == CLEARKEY_KEY_LEN;
|
||||
}
|
||||
|
||||
static bool
|
||||
ParseKeyObject(ParserContext& aCtx, KeyIdPair& aOutKey, bool& aOutValid)
|
||||
{
|
||||
aOutValid = false;
|
||||
|
||||
EXPECT_SYMBOL(aCtx, '{');
|
||||
|
||||
// Ignore empty objects
|
||||
if (PeekSymbol(aCtx) == '}') {
|
||||
GetNextSymbol(aCtx);
|
||||
return true;
|
||||
}
|
||||
|
||||
// By spec, type should be "oct".
|
||||
bool isExpectedType = false;
|
||||
// By spec, alg should be "A128KW".
|
||||
bool isExpectedAlg = false;
|
||||
|
||||
string keyId;
|
||||
string key;
|
||||
|
||||
while (true) {
|
||||
string label;
|
||||
string value;
|
||||
|
||||
if (!GetNextLabel(aCtx, label)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
EXPECT_SYMBOL(aCtx, ':');
|
||||
if (label == "kty") {
|
||||
if (!GetNextLabel(aCtx, value)) return false;
|
||||
isExpectedType = value == "oct";
|
||||
} else if (label == "alg") {
|
||||
if (!GetNextLabel(aCtx, value)) return false;
|
||||
isExpectedAlg = value == "A128KW";
|
||||
} else if (label == "k" && PeekSymbol(aCtx) == '"') {
|
||||
// if this isn't a string we will fall through to the SkipToken() path.
|
||||
if (!GetNextLabel(aCtx, key)) return false;
|
||||
} else if (label == "kid" && PeekSymbol(aCtx) == '"') {
|
||||
if (!GetNextLabel(aCtx, keyId)) return false;
|
||||
} else {
|
||||
if (!SkipToken(aCtx)) return false;
|
||||
}
|
||||
|
||||
uint8_t sym = PeekSymbol(aCtx);
|
||||
if (!sym || sym == '}') {
|
||||
break;
|
||||
}
|
||||
EXPECT_SYMBOL(aCtx, ',');
|
||||
}
|
||||
|
||||
if (isExpectedType && isExpectedAlg &&
|
||||
!key.empty() && !keyId.empty() &&
|
||||
DecodeBase64(keyId, aOutKey.mKeyId) &&
|
||||
DecodeKey(key, aOutKey.mKey)) {
|
||||
aOutValid = true;
|
||||
}
|
||||
|
||||
return GetNextSymbol(aCtx) == '}';
|
||||
}
|
||||
|
||||
static bool
|
||||
ParseKeys(ParserContext& aCtx, vector<KeyIdPair>& aOutKeys)
|
||||
{
|
||||
// Consume start of array.
|
||||
EXPECT_SYMBOL(aCtx, '[');
|
||||
|
||||
while (true) {
|
||||
KeyIdPair key;
|
||||
bool valid;
|
||||
if (!ParseKeyObject(aCtx, key, valid)) {
|
||||
CK_LOGE("Failed to parse key object");
|
||||
return false;
|
||||
}
|
||||
|
||||
if (valid) {
|
||||
aOutKeys.push_back(key);
|
||||
}
|
||||
|
||||
uint8_t sym = PeekSymbol(aCtx);
|
||||
if (!sym || sym == ']') {
|
||||
break;
|
||||
}
|
||||
|
||||
EXPECT_SYMBOL(aCtx, ',');
|
||||
}
|
||||
|
||||
return GetNextSymbol(aCtx) == ']';
|
||||
}
|
||||
|
||||
/* static */ bool
|
||||
ClearKeyUtils::ParseJWK(const uint8_t* aKeyData, uint32_t aKeyDataSize,
|
||||
vector<KeyIdPair>& aOutKeys)
|
||||
{
|
||||
ParserContext ctx;
|
||||
ctx.mIter = aKeyData;
|
||||
ctx.mEnd = aKeyData + aKeyDataSize;
|
||||
|
||||
// Consume '{' from start of object.
|
||||
EXPECT_SYMBOL(ctx, '{');
|
||||
|
||||
while (true) {
|
||||
string label;
|
||||
// Consume member key.
|
||||
if (!GetNextLabel(ctx, label)) return false;
|
||||
EXPECT_SYMBOL(ctx, ':');
|
||||
|
||||
if (label == "keys") {
|
||||
// Parse "keys" array.
|
||||
if (!ParseKeys(ctx, aOutKeys)) return false;
|
||||
} else if (label == "type") {
|
||||
// Consume type string.
|
||||
string type;
|
||||
if (!GetNextLabel(ctx, type)) return false;
|
||||
// XXX todo support "persistent" session type
|
||||
if (type != "temporary") {
|
||||
return false;
|
||||
}
|
||||
} else {
|
||||
SkipToken(ctx);
|
||||
}
|
||||
|
||||
// Check for end of object.
|
||||
if (PeekSymbol(ctx) == '}') {
|
||||
break;
|
||||
}
|
||||
|
||||
// Consume ',' between object members.
|
||||
EXPECT_SYMBOL(ctx, ',');
|
||||
}
|
||||
|
||||
// Consume '}' from end of object.
|
||||
EXPECT_SYMBOL(ctx, '}');
|
||||
|
||||
return true;
|
||||
}
|
||||
|
|
@ -0,0 +1,53 @@
|
|||
/* This Source Code Form is subject to the terms of the Mozilla Public
|
||||
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
||||
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
||||
|
||||
#ifndef __ClearKeyUtils_h__
|
||||
#define __ClearKeyUtils_h__
|
||||
|
||||
#include <stdint.h>
|
||||
#include <string>
|
||||
#include <vector>
|
||||
|
||||
#define CLEARKEY_KEY_LEN 16
|
||||
|
||||
#if 0
|
||||
void CK_Log(const char* aFmt, ...);
|
||||
#define CK_LOGE(...) CK_Log(__VA_ARGS__)
|
||||
#define CK_LOGD(...) CK_Log(__VA_ARGS__)
|
||||
#define CK_LOGW(...) CK_Log(__VA_ARGS__)
|
||||
#else
|
||||
#define CK_LOGE(...)
|
||||
#define CK_LOGD(...)
|
||||
#define CK_LOGW(...)
|
||||
#endif
|
||||
|
||||
struct GMPPlatformAPI;
|
||||
extern GMPPlatformAPI* GetPlatform();
|
||||
|
||||
typedef std::vector<uint8_t> KeyId;
|
||||
typedef std::vector<uint8_t> Key;
|
||||
|
||||
struct KeyIdPair
|
||||
{
|
||||
KeyId mKeyId;
|
||||
Key mKey;
|
||||
};
|
||||
|
||||
class ClearKeyUtils
|
||||
{
|
||||
public:
|
||||
static void DecryptAES(const std::vector<uint8_t>& aKey,
|
||||
std::vector<uint8_t>& aData, std::vector<uint8_t>& aIV);
|
||||
|
||||
static void ParseInitData(const uint8_t* aInitData, uint32_t aInitDataSize,
|
||||
std::vector<Key>& aOutKeys);
|
||||
|
||||
static void MakeKeyRequest(const std::vector<KeyId>& aKeyIds,
|
||||
std::string& aOutRequest);
|
||||
|
||||
static bool ParseJWK(const uint8_t* aKeyData, uint32_t aKeyDataSize,
|
||||
std::vector<KeyIdPair>& aOutKeys);
|
||||
};
|
||||
|
||||
#endif // __ClearKeyUtils_h__
|
||||
|
|
@ -0,0 +1,8 @@
|
|||
# This Source Code Form is subject to the terms of the Mozilla Public
|
||||
# License, v. 2.0. If a copy of the MPL was not distributed with this
|
||||
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
||||
|
||||
include $(topsrcdir)/config/rules.mk
|
||||
|
||||
libs::
|
||||
cp $(srcdir)/clearkey.info .
|
||||
|
|
@ -0,0 +1,4 @@
|
|||
Name: clearkey
|
||||
Description: ClearKey decrypt-only GMP plugin
|
||||
Version: 0.1
|
||||
APIs: eme-decrypt[org.w3.clearkey]
|
||||
|
|
@ -0,0 +1,49 @@
|
|||
/* This Source Code Form is subject to the terms of the Mozilla Public
|
||||
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
||||
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
||||
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
|
||||
#include "ClearKeyDecryptionManager.h"
|
||||
|
||||
#include "gmp-api/gmp-decryption.h"
|
||||
#include "gmp-api/gmp-platform.h"
|
||||
#include "mozilla/Attributes.h"
|
||||
#include "mozilla/NullPtr.h"
|
||||
|
||||
static GMPPlatformAPI* sPlatform = nullptr;
|
||||
GMPPlatformAPI*
|
||||
GetPlatform()
|
||||
{
|
||||
return sPlatform;
|
||||
}
|
||||
|
||||
extern "C" {
|
||||
|
||||
MOZ_EXPORT GMPErr
|
||||
GMPInit(GMPPlatformAPI* aPlatformAPI)
|
||||
{
|
||||
sPlatform = aPlatformAPI;
|
||||
return GMPNoErr;
|
||||
}
|
||||
|
||||
MOZ_EXPORT GMPErr
|
||||
GMPGetAPI(const char* aApiName, void* aHostAPI, void** aPluginAPI)
|
||||
{
|
||||
if (strcmp(aApiName, "eme-decrypt")) {
|
||||
return GMPNotImplementedErr;
|
||||
}
|
||||
|
||||
*aPluginAPI = new ClearKeyDecryptionManager(static_cast<GMPDecryptorHost*>(aHostAPI));
|
||||
|
||||
return GMPNoErr;
|
||||
}
|
||||
|
||||
MOZ_EXPORT GMPErr
|
||||
GMPShutdown(void)
|
||||
{
|
||||
return GMPNoErr;
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -0,0 +1,23 @@
|
|||
# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
|
||||
# vim: set filetype=python:
|
||||
# This Source Code Form is subject to the terms of the Mozilla Public
|
||||
# License, v. 2.0. If a copy of the MPL was not distributed with this
|
||||
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
||||
|
||||
SharedLibrary('clearkey')
|
||||
|
||||
SOURCES += [
|
||||
'ClearKeyDecryptionManager.cpp',
|
||||
'ClearKeySession.cpp',
|
||||
'ClearKeyUtils.cpp',
|
||||
'gmp-clearkey.cpp',
|
||||
'openaes/oaes_lib.c',
|
||||
'openaes/rand.c',
|
||||
]
|
||||
|
||||
LOCAL_INCLUDES += [
|
||||
'/content/media/gmp',
|
||||
]
|
||||
|
||||
USE_STATIC_LIBS = True
|
||||
USE_LIBS += [ 'mozalloc' ]
|
||||
|
|
@ -172,6 +172,8 @@ if CONFIG['ENABLE_MARIONETTE'] or CONFIG['MOZ_WIDGET_TOOLKIT'] not in ('gonk', '
|
|||
|
||||
add_tier_dir('platform', 'tools/quitter')
|
||||
|
||||
add_tier_dir('platform', 'media/gmp-clearkey/0.1')
|
||||
|
||||
if CONFIG['ENABLE_TESTS']:
|
||||
add_tier_dir('platform', [
|
||||
'testing/mochitest',
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче