gecko-dev/dom/base/nsPluginArray.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "nsPluginArray.h"
#include "mozilla/dom/PluginArrayBinding.h"
#include "mozilla/dom/PluginBinding.h"
#include "mozilla/dom/HiddenPluginEvent.h"
#include "nsMimeTypeArray.h"
#include "Navigator.h"
#include "nsIDocShell.h"
#include "nsIWebNavigation.h"
#include "nsPluginHost.h"
#include "nsPluginTags.h"
#include "nsIObserverService.h"
#include "nsIWeakReference.h"
#include "mozilla/Services.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsContentUtils.h"
#include "nsIPermissionManager.h"
#include "mozilla/dom/Document.h"
#include "nsIBlocklistService.h"
using namespace mozilla;
using namespace mozilla::dom;
nsPluginArray::nsPluginArray(nsPIDOMWindowInner* aWindow) : mWindow(aWindow) {}
void nsPluginArray::Init() {
nsCOMPtr<nsIObserverService> obsService =
mozilla::services::GetObserverService();
if (obsService) {
obsService->AddObserver(this, "plugin-info-updated", true);
}
}
nsPluginArray::~nsPluginArray() = default;
nsPIDOMWindowInner* nsPluginArray::GetParentObject() const {
MOZ_ASSERT(mWindow);
return mWindow;
}
JSObject* nsPluginArray::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return PluginArray_Binding::Wrap(aCx, this, aGivenProto);
}
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsPluginArray)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsPluginArray)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsPluginArray)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIObserver)
NS_INTERFACE_MAP_ENTRY(nsIObserver)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(nsPluginArray, mWindow, mPlugins,
mCTPPlugins)
static void GetPluginMimeTypes(
const nsTArray<RefPtr<nsPluginElement>>& aPlugins,
nsTArray<RefPtr<nsMimeType>>& aMimeTypes) {
for (uint32_t i = 0; i < aPlugins.Length(); ++i) {
nsPluginElement* plugin = aPlugins[i];
aMimeTypes.AppendElements(plugin->MimeTypes());
}
}
static bool operator<(const RefPtr<nsMimeType>& lhs,
const RefPtr<nsMimeType>& rhs) {
// Sort MIME types alphabetically by type name.
return lhs->Type() < rhs->Type();
}
void nsPluginArray::GetMimeTypes(nsTArray<RefPtr<nsMimeType>>& aMimeTypes) {
aMimeTypes.Clear();
if (!AllowPlugins()) {
return;
}
EnsurePlugins();
GetPluginMimeTypes(mPlugins, aMimeTypes);
// Alphabetize the enumeration order of non-hidden MIME types to reduce
// fingerprintable entropy based on plugins' installation file times.
aMimeTypes.Sort();
}
void nsPluginArray::GetCTPMimeTypes(nsTArray<RefPtr<nsMimeType>>& aMimeTypes) {
aMimeTypes.Clear();
if (!AllowPlugins()) {
return;
}
EnsurePlugins();
GetPluginMimeTypes(mCTPPlugins, aMimeTypes);
// Alphabetize the enumeration order of non-hidden MIME types to reduce
// fingerprintable entropy based on plugins' installation file times.
aMimeTypes.Sort();
}
nsPluginElement* nsPluginArray::Item(uint32_t aIndex, CallerType aCallerType) {
bool unused;
return IndexedGetter(aIndex, unused, aCallerType);
}
nsPluginElement* nsPluginArray::NamedItem(const nsAString& aName,
CallerType aCallerType) {
bool unused;
return NamedGetter(aName, unused, aCallerType);
}
void nsPluginArray::Refresh(bool aReloadDocuments) {
RefPtr<nsPluginHost> pluginHost = nsPluginHost::GetInst();
if (!AllowPlugins() || !pluginHost) {
return;
}
// NS_ERROR_PLUGINS_PLUGINSNOTCHANGED on reloading plugins indicates
// that plugins did not change and was not reloaded
if (pluginHost->ReloadPlugins() == NS_ERROR_PLUGINS_PLUGINSNOTCHANGED) {
nsTArray<nsCOMPtr<nsIInternalPluginTag>> newPluginTags;
pluginHost->GetPlugins(newPluginTags);
// Check if the number of plugins we know about are different from
// the number of plugin tags the plugin host knows about. If the
// lengths are different, we refresh. This is safe because we're
// notified for every plugin enabling/disabling event that
// happens, and therefore the lengths will be in sync only when
// the both arrays contain the same plugin tags (though as
// different types).
if (newPluginTags.Length() == mPlugins.Length()) {
return;
}
}
mPlugins.Clear();
mCTPPlugins.Clear();
RefPtr<Navigator> navigator = mWindow->Navigator();
navigator->RefreshMIMEArray();
nsCOMPtr<nsIWebNavigation> webNav = do_GetInterface(mWindow);
if (aReloadDocuments && webNav) {
webNav->Reload(nsIWebNavigation::LOAD_FLAGS_NONE);
}
}
nsPluginElement* nsPluginArray::IndexedGetter(uint32_t aIndex, bool& aFound,
CallerType aCallerType) {
aFound = false;
if (!AllowPlugins() || nsContentUtils::ResistFingerprinting(aCallerType)) {
return nullptr;
}
EnsurePlugins();
aFound = aIndex < mPlugins.Length();
if (!aFound) {
return nullptr;
}
return mPlugins[aIndex];
}
void nsPluginArray::Invalidate() {
nsCOMPtr<nsIObserverService> obsService =
mozilla::services::GetObserverService();
if (obsService) {
obsService->RemoveObserver(this, "plugin-info-updated");
}
}
static nsPluginElement* FindPlugin(
const nsTArray<RefPtr<nsPluginElement>>& aPlugins, const nsAString& aName) {
for (uint32_t i = 0; i < aPlugins.Length(); ++i) {
nsAutoString pluginName;
nsPluginElement* plugin = aPlugins[i];
plugin->GetName(pluginName);
if (pluginName.Equals(aName)) {
return plugin;
}
}
return nullptr;
}
nsPluginElement* nsPluginArray::NamedGetter(const nsAString& aName,
bool& aFound,
CallerType aCallerType) {
aFound = false;
if (!AllowPlugins() || nsContentUtils::ResistFingerprinting(aCallerType)) {
return nullptr;
}
EnsurePlugins();
nsPluginElement* plugin = FindPlugin(mPlugins, aName);
aFound = (plugin != nullptr);
if (!aFound) {
nsPluginElement* hiddenPlugin = FindPlugin(mCTPPlugins, aName);
if (hiddenPlugin) {
NotifyHiddenPluginTouched(hiddenPlugin);
}
}
return plugin;
}
void nsPluginArray::NotifyHiddenPluginTouched(nsPluginElement* aHiddenElement) {
HiddenPluginEventInit init;
init.mTag = aHiddenElement->PluginTag();
nsCOMPtr<Document> doc = aHiddenElement->GetParentObject()->GetDoc();
RefPtr<HiddenPluginEvent> event = HiddenPluginEvent::Constructor(
doc, NS_LITERAL_STRING("HiddenPlugin"), init);
event->SetTarget(doc);
event->SetTrusted(true);
event->WidgetEventPtr()->mFlags.mOnlyChromeDispatch = true;
doc->DispatchEvent(*event);
}
uint32_t nsPluginArray::Length(CallerType aCallerType) {
if (!AllowPlugins() || nsContentUtils::ResistFingerprinting(aCallerType)) {
return 0;
}
EnsurePlugins();
return mPlugins.Length();
}
void nsPluginArray::GetSupportedNames(nsTArray<nsString>& aRetval,
CallerType aCallerType) {
aRetval.Clear();
if (!AllowPlugins() || nsContentUtils::ResistFingerprinting(aCallerType)) {
return;
}
for (uint32_t i = 0; i < mPlugins.Length(); ++i) {
nsAutoString pluginName;
mPlugins[i]->GetName(pluginName);
aRetval.AppendElement(pluginName);
}
}
NS_IMETHODIMP
nsPluginArray::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
if (!nsCRT::strcmp(aTopic, "plugin-info-updated")) {
Refresh(false);
}
return NS_OK;
}
bool nsPluginArray::AllowPlugins() const {
if (!mWindow) {
return false;
}
nsCOMPtr<Document> doc = mWindow->GetDoc();
if (!doc) {
return false;
}
return doc->GetAllowPlugins();
}
static bool operator<(const RefPtr<nsPluginElement>& lhs,
const RefPtr<nsPluginElement>& rhs) {
// Sort plugins alphabetically by name.
return lhs->PluginTag()->Name() < rhs->PluginTag()->Name();
}
static bool PluginShouldBeHidden(const nsCString& aName) {
// This only supports one hidden plugin
nsAutoCString value;
Preferences::GetCString("plugins.navigator.hidden_ctp_plugin", value);
return value.Equals(aName);
}
void nsPluginArray::EnsurePlugins() {
if (!mPlugins.IsEmpty() || !mCTPPlugins.IsEmpty()) {
// We already have an array of plugin elements.
return;
}
RefPtr<nsPluginHost> pluginHost = nsPluginHost::GetInst();
if (!pluginHost) {
// We have no plugin host.
return;
}
nsTArray<nsCOMPtr<nsIInternalPluginTag>> pluginTags;
pluginHost->GetPlugins(pluginTags);
// need to wrap each of these with a nsPluginElement, which is
// scriptable.
for (uint32_t i = 0; i < pluginTags.Length(); ++i) {
nsCOMPtr<nsPluginTag> pluginTag = do_QueryInterface(pluginTags[i]);
if (!pluginTag) {
mPlugins.AppendElement(new nsPluginElement(mWindow, pluginTags[i]));
} else if (pluginTag->IsActive()) {
uint32_t permission = nsIPermissionManager::ALLOW_ACTION;
uint32_t blocklistState;
if (pluginTag->IsClicktoplay() &&
NS_SUCCEEDED(pluginTag->GetBlocklistState(&blocklistState)) &&
blocklistState == nsIBlocklistService::STATE_NOT_BLOCKED) {
nsCString name;
pluginTag->GetName(name);
if (PluginShouldBeHidden(name)) {
RefPtr<nsPluginHost> pluginHost = nsPluginHost::GetInst();
nsCString permString;
nsresult rv =
pluginHost->GetPermissionStringForTag(pluginTag, 0, permString);
if (rv == NS_OK) {
nsCOMPtr<Document> currentDoc = mWindow->GetExtantDoc();
// The top-level content document gets the final say on whether or
// not a plugin is going to be hidden or not, regardless of the
// origin that a subframe is hosted at. This is to avoid spamming
// the user with the hidden plugin notification bar when third-party
// iframes attempt to access navigator.plugins after the user has
// already expressed that the top-level document has this
// permission.
nsCOMPtr<Document> topDoc =
currentDoc->GetTopLevelContentDocument();
if (topDoc) {
nsIPrincipal* principal = topDoc->NodePrincipal();
nsCOMPtr<nsIPermissionManager> permMgr =
services::GetPermissionManager();
permMgr->TestPermissionFromPrincipal(principal, permString,
&permission);
}
}
}
}
if (permission == nsIPermissionManager::ALLOW_ACTION) {
mPlugins.AppendElement(new nsPluginElement(mWindow, pluginTags[i]));
} else {
mCTPPlugins.AppendElement(new nsPluginElement(mWindow, pluginTags[i]));
}
}
}
if (mPlugins.Length() == 0 && mCTPPlugins.Length() != 0) {
nsCOMPtr<nsPluginTag> hiddenTag = new nsPluginTag(
"Hidden Plugin", nullptr, "dummy.plugin", nullptr, nullptr, nullptr,
nullptr, nullptr, 0, 0, false, nsIBlocklistService::STATE_NOT_BLOCKED);
mPlugins.AppendElement(new nsPluginElement(mWindow, hiddenTag));
}
// Alphabetize the enumeration order of non-hidden plugins to reduce
// fingerprintable entropy based on plugins' installation file times.
mPlugins.Sort();
}
// nsPluginElement implementation.
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsPluginElement)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsPluginElement)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsPluginElement)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(nsPluginElement, mWindow, mMimeTypes)
nsPluginElement::nsPluginElement(nsPIDOMWindowInner* aWindow,
nsIInternalPluginTag* aPluginTag)
: mWindow(aWindow), mPluginTag(aPluginTag) {}
nsPluginElement::~nsPluginElement() = default;
nsPIDOMWindowInner* nsPluginElement::GetParentObject() const {
MOZ_ASSERT(mWindow);
return mWindow;
}
JSObject* nsPluginElement::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return Plugin_Binding::Wrap(aCx, this, aGivenProto);
}
void nsPluginElement::GetDescription(nsString& retval) const {
CopyUTF8toUTF16(mPluginTag->Description(), retval);
}
void nsPluginElement::GetFilename(nsString& retval) const {
CopyUTF8toUTF16(mPluginTag->FileName(), retval);
}
void nsPluginElement::GetVersion(nsString& retval) const {
CopyUTF8toUTF16(mPluginTag->Version(), retval);
}
void nsPluginElement::GetName(nsString& retval) const {
CopyUTF8toUTF16(mPluginTag->Name(), retval);
}
nsMimeType* nsPluginElement::Item(uint32_t aIndex) {
EnsurePluginMimeTypes();
return mMimeTypes.SafeElementAt(aIndex);
}
nsMimeType* nsPluginElement::NamedItem(const nsAString& aName) {
bool unused;
return NamedGetter(aName, unused);
}
nsMimeType* nsPluginElement::IndexedGetter(uint32_t aIndex, bool& aFound) {
EnsurePluginMimeTypes();
aFound = aIndex < mMimeTypes.Length();
if (!aFound) {
return nullptr;
}
return mMimeTypes[aIndex];
}
nsMimeType* nsPluginElement::NamedGetter(const nsAString& aName, bool& aFound) {
EnsurePluginMimeTypes();
aFound = false;
for (uint32_t i = 0; i < mMimeTypes.Length(); ++i) {
if (mMimeTypes[i]->Type().Equals(aName)) {
aFound = true;
return mMimeTypes[i];
}
}
return nullptr;
}
uint32_t nsPluginElement::Length() {
EnsurePluginMimeTypes();
return mMimeTypes.Length();
}
void nsPluginElement::GetSupportedNames(nsTArray<nsString>& retval) {
EnsurePluginMimeTypes();
for (uint32_t i = 0; i < mMimeTypes.Length(); ++i) {
retval.AppendElement(mMimeTypes[i]->Type());
}
}
nsTArray<RefPtr<nsMimeType>>& nsPluginElement::MimeTypes() {
EnsurePluginMimeTypes();
return mMimeTypes;
}
void nsPluginElement::EnsurePluginMimeTypes() {
if (!mMimeTypes.IsEmpty()) {
return;
}
if (mPluginTag->MimeTypes().Length() !=
mPluginTag->MimeDescriptions().Length() ||
mPluginTag->MimeTypes().Length() != mPluginTag->Extensions().Length()) {
MOZ_ASSERT(false, "mime type arrays expected to be the same length");
return;
}
for (uint32_t i = 0; i < mPluginTag->MimeTypes().Length(); ++i) {
NS_ConvertUTF8toUTF16 type(mPluginTag->MimeTypes()[i]);
NS_ConvertUTF8toUTF16 description(mPluginTag->MimeDescriptions()[i]);
NS_ConvertUTF8toUTF16 extension(mPluginTag->Extensions()[i]);
mMimeTypes.AppendElement(
new nsMimeType(mWindow, this, type, description, extension));
}
}