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-rw-r--r--dom/media/systemservices/MediaParent.cpp536
1 files changed, 536 insertions, 0 deletions
diff --git a/dom/media/systemservices/MediaParent.cpp b/dom/media/systemservices/MediaParent.cpp
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+++ b/dom/media/systemservices/MediaParent.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et ft=cpp : */
+/* 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 "MediaParent.h"
+
+#include "mozilla/Base64.h"
+#include <mozilla/StaticMutex.h>
+
+#include "MediaUtils.h"
+#include "MediaEngine.h"
+#include "VideoUtils.h"
+#include "nsClassHashtable.h"
+#include "nsThreadUtils.h"
+#include "nsNetCID.h"
+#include "nsNetUtil.h"
+#include "nsIInputStream.h"
+#include "nsILineInputStream.h"
+#include "nsIOutputStream.h"
+#include "nsISafeOutputStream.h"
+#include "nsAppDirectoryServiceDefs.h"
+#include "nsIFile.h"
+#include "nsISupportsImpl.h"
+#include "mozilla/Logging.h"
+
+#undef LOG
+mozilla::LazyLogModule gMediaParentLog("MediaParent");
+#define LOG(args) MOZ_LOG(gMediaParentLog, mozilla::LogLevel::Debug, args)
+
+// A file in the profile dir is used to persist mOriginKeys used to anonymize
+// deviceIds to be unique per origin, to avoid them being supercookies.
+
+#define ORIGINKEYS_FILE u"enumerate_devices.txt"
+#define ORIGINKEYS_VERSION "1"
+
+namespace mozilla::media {
+
+StaticMutex sOriginKeyStoreStsMutex;
+
+class OriginKeyStore {
+ NS_INLINE_DECL_REFCOUNTING(OriginKeyStore);
+ class OriginKey {
+ public:
+ static const size_t DecodedLength = 18;
+ static const size_t EncodedLength = DecodedLength * 4 / 3;
+
+ explicit OriginKey(const nsACString& aKey,
+ int64_t aSecondsStamp = 0) // 0 = temporal
+ : mKey(aKey), mSecondsStamp(aSecondsStamp) {}
+
+ nsCString mKey; // Base64 encoded.
+ int64_t mSecondsStamp;
+ };
+
+ class OriginKeysTable {
+ public:
+ OriginKeysTable() : mPersistCount(0) {}
+
+ nsresult GetPrincipalKey(const ipc::PrincipalInfo& aPrincipalInfo,
+ nsCString& aResult, bool aPersist = false) {
+ nsAutoCString principalString;
+ PrincipalInfoToString(aPrincipalInfo, principalString);
+
+ OriginKey* key;
+ if (!mKeys.Get(principalString, &key)) {
+ nsCString salt; // Make a new one
+ nsresult rv = GenerateRandomName(salt, OriginKey::EncodedLength);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+ key = mKeys.InsertOrUpdate(principalString, MakeUnique<OriginKey>(salt))
+ .get();
+ }
+ if (aPersist && !key->mSecondsStamp) {
+ key->mSecondsStamp = PR_Now() / PR_USEC_PER_SEC;
+ mPersistCount++;
+ }
+ aResult = key->mKey;
+ return NS_OK;
+ }
+
+ void Clear(int64_t aSinceWhen) {
+ // Avoid int64_t* <-> void* casting offset
+ OriginKey since(nsCString(), aSinceWhen / PR_USEC_PER_SEC);
+ for (auto iter = mKeys.Iter(); !iter.Done(); iter.Next()) {
+ auto originKey = iter.UserData();
+ LOG((((originKey->mSecondsStamp >= since.mSecondsStamp)
+ ? "%s: REMOVE %" PRId64 " >= %" PRId64
+ : "%s: KEEP %" PRId64 " < %" PRId64),
+ __FUNCTION__, originKey->mSecondsStamp, since.mSecondsStamp));
+
+ if (originKey->mSecondsStamp >= since.mSecondsStamp) {
+ iter.Remove();
+ }
+ }
+ mPersistCount = 0;
+ }
+
+ private:
+ void PrincipalInfoToString(const ipc::PrincipalInfo& aPrincipalInfo,
+ nsACString& aString) {
+ switch (aPrincipalInfo.type()) {
+ case ipc::PrincipalInfo::TSystemPrincipalInfo:
+ aString.AssignLiteral("[System Principal]");
+ return;
+
+ case ipc::PrincipalInfo::TNullPrincipalInfo: {
+ const ipc::NullPrincipalInfo& info =
+ aPrincipalInfo.get_NullPrincipalInfo();
+ aString.Assign(info.spec());
+ return;
+ }
+
+ case ipc::PrincipalInfo::TContentPrincipalInfo: {
+ const ipc::ContentPrincipalInfo& info =
+ aPrincipalInfo.get_ContentPrincipalInfo();
+ aString.Assign(info.originNoSuffix());
+
+ nsAutoCString suffix;
+ info.attrs().CreateSuffix(suffix);
+ aString.Append(suffix);
+ return;
+ }
+
+ case ipc::PrincipalInfo::TExpandedPrincipalInfo: {
+ const ipc::ExpandedPrincipalInfo& info =
+ aPrincipalInfo.get_ExpandedPrincipalInfo();
+
+ aString.AssignLiteral("[Expanded Principal [");
+
+ for (uint32_t i = 0; i < info.allowlist().Length(); i++) {
+ nsAutoCString str;
+ PrincipalInfoToString(info.allowlist()[i], str);
+
+ if (i != 0) {
+ aString.AppendLiteral(", ");
+ }
+
+ aString.Append(str);
+ }
+
+ aString.AppendLiteral("]]");
+ return;
+ }
+
+ default:
+ MOZ_CRASH("Unknown PrincipalInfo type!");
+ }
+ }
+
+ protected:
+ nsClassHashtable<nsCStringHashKey, OriginKey> mKeys;
+ size_t mPersistCount;
+ };
+
+ class OriginKeysLoader : public OriginKeysTable {
+ public:
+ OriginKeysLoader() = default;
+
+ nsresult GetPrincipalKey(const ipc::PrincipalInfo& aPrincipalInfo,
+ nsCString& aResult, bool aPersist = false) {
+ auto before = mPersistCount;
+ nsresult rv =
+ OriginKeysTable::GetPrincipalKey(aPrincipalInfo, aResult, aPersist);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ if (mPersistCount != before) {
+ Save();
+ }
+ return NS_OK;
+ }
+
+ already_AddRefed<nsIFile> GetFile() {
+ MOZ_ASSERT(mProfileDir);
+ nsCOMPtr<nsIFile> file;
+ nsresult rv = mProfileDir->Clone(getter_AddRefs(file));
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return nullptr;
+ }
+ file->Append(nsLiteralString(ORIGINKEYS_FILE));
+ return file.forget();
+ }
+
+ // Format of file is key secondsstamp origin (first line is version #):
+ //
+ // 1
+ // rOMAAbFujNwKyIpj4RJ3Wt5Q 1424733961 http://fiddle.jshell.net
+ // rOMAAbFujNwKyIpj4RJ3Wt5Q 1424734841 http://mozilla.github.io
+ // etc.
+
+ nsresult Read() {
+ nsCOMPtr<nsIFile> file = GetFile();
+ if (NS_WARN_IF(!file)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+ bool exists;
+ nsresult rv = file->Exists(&exists);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+ if (!exists) {
+ return NS_OK;
+ }
+
+ nsCOMPtr<nsIInputStream> stream;
+ rv = NS_NewLocalFileInputStream(getter_AddRefs(stream), file);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+ nsCOMPtr<nsILineInputStream> i = do_QueryInterface(stream);
+ MOZ_ASSERT(i);
+ MOZ_ASSERT(!mPersistCount);
+
+ nsCString line;
+ bool hasMoreLines;
+ rv = i->ReadLine(line, &hasMoreLines);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+ if (!line.EqualsLiteral(ORIGINKEYS_VERSION)) {
+ // If version on disk is newer than we can understand then ignore it.
+ return NS_OK;
+ }
+
+ while (hasMoreLines) {
+ rv = i->ReadLine(line, &hasMoreLines);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+ // Read key secondsstamp origin.
+ // Ignore any lines that don't fit format in the comment above exactly.
+ int32_t f = line.FindChar(' ');
+ if (f < 0) {
+ continue;
+ }
+ const nsACString& key = Substring(line, 0, f);
+ const nsACString& s = Substring(line, f + 1);
+ f = s.FindChar(' ');
+ if (f < 0) {
+ continue;
+ }
+ int64_t secondsstamp = Substring(s, 0, f).ToInteger64(&rv);
+ if (NS_FAILED(rv)) {
+ continue;
+ }
+ const nsACString& origin = Substring(s, f + 1);
+
+ // Validate key
+ if (key.Length() != OriginKey::EncodedLength) {
+ continue;
+ }
+ nsCString dummy;
+ rv = Base64Decode(key, dummy);
+ if (NS_FAILED(rv)) {
+ continue;
+ }
+ mKeys.InsertOrUpdate(origin, MakeUnique<OriginKey>(key, secondsstamp));
+ }
+ mPersistCount = mKeys.Count();
+ return NS_OK;
+ }
+
+ nsresult Write() {
+ nsCOMPtr<nsIFile> file = GetFile();
+ if (NS_WARN_IF(!file)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+
+ nsCOMPtr<nsIOutputStream> stream;
+ nsresult rv =
+ NS_NewSafeLocalFileOutputStream(getter_AddRefs(stream), file);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ nsAutoCString versionBuffer;
+ versionBuffer.AppendLiteral(ORIGINKEYS_VERSION);
+ versionBuffer.Append('\n');
+
+ uint32_t count;
+ rv = stream->Write(versionBuffer.Data(), versionBuffer.Length(), &count);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+ if (count != versionBuffer.Length()) {
+ return NS_ERROR_UNEXPECTED;
+ }
+ for (const auto& entry : mKeys) {
+ const nsACString& origin = entry.GetKey();
+ OriginKey* originKey = entry.GetWeak();
+
+ if (!originKey->mSecondsStamp) {
+ continue; // don't write temporal ones
+ }
+
+ nsCString originBuffer;
+ originBuffer.Append(originKey->mKey);
+ originBuffer.Append(' ');
+ originBuffer.AppendInt(originKey->mSecondsStamp);
+ originBuffer.Append(' ');
+ originBuffer.Append(origin);
+ originBuffer.Append('\n');
+
+ rv = stream->Write(originBuffer.Data(), originBuffer.Length(), &count);
+ if (NS_WARN_IF(NS_FAILED(rv)) || count != originBuffer.Length()) {
+ break;
+ }
+ }
+
+ nsCOMPtr<nsISafeOutputStream> safeStream = do_QueryInterface(stream);
+ MOZ_ASSERT(safeStream);
+
+ rv = safeStream->Finish();
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+ return NS_OK;
+ }
+
+ nsresult Load() {
+ nsresult rv = Read();
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ Delete();
+ }
+ return rv;
+ }
+
+ nsresult Save() {
+ nsresult rv = Write();
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ NS_WARNING("Failed to write data for EnumerateDevices id-persistence.");
+ Delete();
+ }
+ return rv;
+ }
+
+ void Clear(int64_t aSinceWhen) {
+ OriginKeysTable::Clear(aSinceWhen);
+ Delete();
+ Save();
+ }
+
+ nsresult Delete() {
+ nsCOMPtr<nsIFile> file = GetFile();
+ if (NS_WARN_IF(!file)) {
+ return NS_ERROR_UNEXPECTED;
+ }
+ nsresult rv = file->Remove(false);
+ if (rv == NS_ERROR_FILE_NOT_FOUND) {
+ return NS_OK;
+ }
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+ return NS_OK;
+ }
+
+ void SetProfileDir(nsIFile* aProfileDir) {
+ MOZ_ASSERT(!NS_IsMainThread());
+ bool first = !mProfileDir;
+ mProfileDir = aProfileDir;
+ // Load from disk when we first get a profileDir, but not subsequently.
+ if (first) {
+ Load();
+ }
+ }
+
+ private:
+ nsCOMPtr<nsIFile> mProfileDir;
+ };
+
+ private:
+ static OriginKeyStore* sOriginKeyStore;
+
+ virtual ~OriginKeyStore() {
+ MOZ_ASSERT(NS_IsMainThread());
+ sOriginKeyStore = nullptr;
+ LOG(("%s", __FUNCTION__));
+ }
+
+ public:
+ static RefPtr<OriginKeyStore> Get() {
+ MOZ_ASSERT(NS_IsMainThread());
+ if (!sOriginKeyStore) {
+ sOriginKeyStore = new OriginKeyStore();
+ }
+ return RefPtr(sOriginKeyStore);
+ }
+
+ // Only accessed on StreamTS threads
+ OriginKeysLoader mOriginKeys MOZ_GUARDED_BY(sOriginKeyStoreStsMutex);
+ OriginKeysTable mPrivateBrowsingOriginKeys
+ MOZ_GUARDED_BY(sOriginKeyStoreStsMutex);
+};
+OriginKeyStore* OriginKeyStore::sOriginKeyStore = nullptr;
+
+template <class Super>
+mozilla::ipc::IPCResult Parent<Super>::RecvGetPrincipalKey(
+ const ipc::PrincipalInfo& aPrincipalInfo, const bool& aPersist,
+ PMediaParent::GetPrincipalKeyResolver&& aResolve) {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ // First, get profile dir.
+
+ nsCOMPtr<nsIFile> profileDir;
+ nsresult rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
+ getter_AddRefs(profileDir));
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return IPCResult(this, false);
+ }
+
+ // Resolver has to be called in MainThread but the key is discovered
+ // in a different thread. We wrap the resolver around a MozPromise to make
+ // it more flexible and pass it to the new task. When this is done the
+ // resolver is resolved in MainThread.
+
+ // Then over to stream-transport thread (a thread pool) to do the actual
+ // file io. Stash a promise to hold the answer and get an id for this request.
+
+ nsCOMPtr<nsIEventTarget> sts =
+ do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
+ MOZ_ASSERT(sts);
+ auto taskQueue = TaskQueue::Create(sts.forget(), "RecvGetPrincipalKey");
+ RefPtr<Parent<Super>> that(this);
+
+ InvokeAsync(
+ taskQueue, __func__,
+ [this, that, profileDir, aPrincipalInfo, aPersist]() {
+ MOZ_ASSERT(!NS_IsMainThread());
+
+ StaticMutexAutoLock lock(sOriginKeyStoreStsMutex);
+ mOriginKeyStore->mOriginKeys.SetProfileDir(profileDir);
+
+ nsresult rv;
+ nsAutoCString result;
+ if (IsPrincipalInfoPrivate(aPrincipalInfo)) {
+ rv = mOriginKeyStore->mPrivateBrowsingOriginKeys.GetPrincipalKey(
+ aPrincipalInfo, result);
+ } else {
+ rv = mOriginKeyStore->mOriginKeys.GetPrincipalKey(aPrincipalInfo,
+ result, aPersist);
+ }
+
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return PrincipalKeyPromise::CreateAndReject(rv, __func__);
+ }
+ return PrincipalKeyPromise::CreateAndResolve(result, __func__);
+ })
+ ->Then(
+ GetCurrentSerialEventTarget(), __func__,
+ [aResolve](const PrincipalKeyPromise::ResolveOrRejectValue& aValue) {
+ if (aValue.IsReject()) {
+ aResolve(""_ns);
+ } else {
+ aResolve(aValue.ResolveValue());
+ }
+ });
+
+ return IPC_OK();
+}
+
+template <class Super>
+mozilla::ipc::IPCResult Parent<Super>::RecvSanitizeOriginKeys(
+ const uint64_t& aSinceWhen, const bool& aOnlyPrivateBrowsing) {
+ MOZ_ASSERT(NS_IsMainThread());
+ nsCOMPtr<nsIFile> profileDir;
+ nsresult rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
+ getter_AddRefs(profileDir));
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return IPCResult(this, false);
+ }
+ // Over to stream-transport thread (a thread pool) to do the file io.
+
+ nsCOMPtr<nsIEventTarget> sts =
+ do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
+ MOZ_ASSERT(sts);
+ RefPtr<Parent<Super>> that(this);
+
+ rv = sts->Dispatch(
+ NewRunnableFrom(
+ [this, that, profileDir, aSinceWhen, aOnlyPrivateBrowsing]() {
+ MOZ_ASSERT(!NS_IsMainThread());
+ StaticMutexAutoLock lock(sOriginKeyStoreStsMutex);
+ mOriginKeyStore->mPrivateBrowsingOriginKeys.Clear(aSinceWhen);
+ if (!aOnlyPrivateBrowsing) {
+ mOriginKeyStore->mOriginKeys.SetProfileDir(profileDir);
+ mOriginKeyStore->mOriginKeys.Clear(aSinceWhen);
+ }
+ return NS_OK;
+ }),
+ NS_DISPATCH_NORMAL);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return IPCResult(this, false);
+ }
+ return IPC_OK();
+}
+
+template <class Super>
+void Parent<Super>::ActorDestroy(ActorDestroyReason aWhy) {
+ // No more IPC from here
+ mDestroyed = true;
+ LOG(("%s", __FUNCTION__));
+}
+
+template <class Super>
+Parent<Super>::Parent()
+ : mOriginKeyStore(OriginKeyStore::Get()), mDestroyed(false) {
+ LOG(("media::Parent: %p", this));
+}
+
+template <class Super>
+Parent<Super>::~Parent() {
+ NS_ReleaseOnMainThread("Parent<Super>::mOriginKeyStore",
+ mOriginKeyStore.forget());
+ LOG(("~media::Parent: %p", this));
+}
+
+PMediaParent* AllocPMediaParent() {
+ Parent<PMediaParent>* obj = new Parent<PMediaParent>();
+ obj->AddRef();
+ return obj;
+}
+
+bool DeallocPMediaParent(media::PMediaParent* aActor) {
+ static_cast<Parent<PMediaParent>*>(aActor)->Release();
+ return true;
+}
+
+} // namespace mozilla::media
+
+// Instantiate templates to satisfy linker
+template class mozilla::media::Parent<mozilla::media::NonE10s>;
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